panfrost: Remove old comment

[mesa.git] / src / gallium / drivers / panfrost / pan_context.c

/*
 * © Copyright 2018 Alyssa Rosenzweig
 * Copyright © 2014-2017 Broadcom
 * Copyright (C) 2017 Intel Corporation
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice (including the next
 * paragraph) shall be included in all copies or substantial portions of the
 * Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 *
 */

#include <sys/poll.h>
#include <errno.h>

#include "pan_bo.h"
#include "pan_context.h"
#include "pan_format.h"
#include "panfrost-quirks.h"

#include "util/macros.h"
#include "util/format/u_format.h"
#include "util/u_inlines.h"
#include "util/u_upload_mgr.h"
#include "util/u_memory.h"
#include "util/u_vbuf.h"
#include "util/half_float.h"
#include "util/u_helpers.h"
#include "util/format/u_format.h"
#include "util/u_prim.h"
#include "util/u_prim_restart.h"
#include "indices/u_primconvert.h"
#include "tgsi/tgsi_parse.h"
#include "tgsi/tgsi_from_mesa.h"
#include "util/u_math.h"

#include "pan_screen.h"
#include "pan_blending.h"
#include "pan_blend_shaders.h"
#include "pan_util.h"
#include "pandecode/decode.h"

struct midgard_tiler_descriptor
panfrost_emit_midg_tiler(struct panfrost_batch *batch, unsigned vertex_count)
{
        struct panfrost_screen *screen = pan_screen(batch->ctx->base.screen);
        bool hierarchy = !(screen->quirks & MIDGARD_NO_HIER_TILING);
        struct midgard_tiler_descriptor t = {0};
        unsigned height = batch->key.height;
        unsigned width = batch->key.width;

        t.hierarchy_mask =
                panfrost_choose_hierarchy_mask(width, height, vertex_count, hierarchy);

        /* Compute the polygon header size and use that to offset the body */

        unsigned header_size = panfrost_tiler_header_size(
                                       width, height, t.hierarchy_mask, hierarchy);

        t.polygon_list_size = panfrost_tiler_full_size(
                                     width, height, t.hierarchy_mask, hierarchy);

        /* Sanity check */

        if (vertex_count) {
                struct panfrost_bo *tiler_heap;

                tiler_heap = panfrost_batch_get_tiler_heap(batch);
                t.polygon_list = panfrost_batch_get_polygon_list(batch,
                                                                 header_size +
                                                                 t.polygon_list_size);


                /* Allow the entire tiler heap */
                t.heap_start = tiler_heap->gpu;
                t.heap_end = tiler_heap->gpu + tiler_heap->size;
        } else {
                struct panfrost_bo *tiler_dummy;

                tiler_dummy = panfrost_batch_get_tiler_dummy(batch);
                header_size = MALI_TILER_MINIMUM_HEADER_SIZE;

                /* The tiler is disabled, so don't allow the tiler heap */
                t.heap_start = tiler_dummy->gpu;
                t.heap_end = t.heap_start;

                /* Use a dummy polygon list */
                t.polygon_list = tiler_dummy->gpu;

                /* Disable the tiler */
                if (hierarchy)
                        t.hierarchy_mask |= MALI_TILER_DISABLED;
                else {
                        t.hierarchy_mask = MALI_TILER_USER;
                        t.polygon_list_size = MALI_TILER_MINIMUM_HEADER_SIZE + 4;

                        /* We don't have a WRITE_VALUE job, so write the polygon list manually */
                        uint32_t *polygon_list_body = (uint32_t *) (tiler_dummy->cpu + header_size);
                        polygon_list_body[0] = 0xa0000000; /* TODO: Just that? */
                }
        }

        t.polygon_list_body =
                t.polygon_list + header_size;

        return t;
}

static void
panfrost_clear(
        struct pipe_context *pipe,
        unsigned buffers,
        const union pipe_color_union *color,
        double depth, unsigned stencil)
{
        struct panfrost_context *ctx = pan_context(pipe);

        /* TODO: panfrost_get_fresh_batch_for_fbo() instantiates a new batch if
         * the existing batch targeting this FBO has draws. We could probably
         * avoid that by replacing plain clears by quad-draws with a specific
         * color/depth/stencil value, thus avoiding the generation of extra
         * fragment jobs.
         */
        struct panfrost_batch *batch = panfrost_get_fresh_batch_for_fbo(ctx);

        panfrost_batch_add_fbo_bos(batch);
        panfrost_batch_clear(batch, buffers, color, depth, stencil);
}

/* TODO: Bifrost requires just a mali_shared_memory, without the rest of the
 * framebuffer */

static void
panfrost_attach_vt_framebuffer(struct panfrost_context *ctx)
{
        struct panfrost_screen *screen = pan_screen(ctx->base.screen);
        struct panfrost_batch *batch = panfrost_get_batch_for_fbo(ctx);

        /* If we haven't, reserve space for the framebuffer */

        if (!batch->framebuffer.gpu) {
                unsigned size = (screen->quirks & MIDGARD_SFBD) ?
                        sizeof(struct mali_single_framebuffer) :
                        sizeof(struct mali_framebuffer);

                batch->framebuffer = panfrost_allocate_transient(batch, size);

                /* Tag the pointer */
                if (!(screen->quirks & MIDGARD_SFBD))
                        batch->framebuffer.gpu |= MALI_MFBD;
        }

        for (unsigned i = 0; i < PIPE_SHADER_TYPES; ++i)
                ctx->payloads[i].postfix.shared_memory = batch->framebuffer.gpu;
}

/* Reset per-frame context, called on context initialisation as well as after
 * flushing a frame */

void
panfrost_invalidate_frame(struct panfrost_context *ctx)
{
        for (unsigned i = 0; i < PIPE_SHADER_TYPES; ++i)
                ctx->payloads[i].postfix.shared_memory = 0;

        /* TODO: When does this need to be handled? */
        ctx->active_queries = true;
}

/* In practice, every field of these payloads should be configurable
 * arbitrarily, which means these functions are basically catch-all's for
 * as-of-yet unwavering unknowns */

static void
panfrost_emit_vertex_payload(struct panfrost_context *ctx)
{
        /* 0x2 bit clear on 32-bit T6XX */

        struct midgard_payload_vertex_tiler payload = {
                .gl_enables = 0x4 | 0x2,
        };

        /* Vertex and compute are closely coupled, so share a payload */

        memcpy(&ctx->payloads[PIPE_SHADER_VERTEX], &payload, sizeof(payload));
        memcpy(&ctx->payloads[PIPE_SHADER_COMPUTE], &payload, sizeof(payload));
}

static unsigned
translate_tex_wrap(enum pipe_tex_wrap w)
{
        switch (w) {
        case PIPE_TEX_WRAP_REPEAT:
                return MALI_WRAP_REPEAT;

        case PIPE_TEX_WRAP_CLAMP:
                return MALI_WRAP_CLAMP;

        case PIPE_TEX_WRAP_CLAMP_TO_EDGE:
                return MALI_WRAP_CLAMP_TO_EDGE;

        case PIPE_TEX_WRAP_CLAMP_TO_BORDER:
                return MALI_WRAP_CLAMP_TO_BORDER;

        case PIPE_TEX_WRAP_MIRROR_REPEAT:
                return MALI_WRAP_MIRRORED_REPEAT;

        case PIPE_TEX_WRAP_MIRROR_CLAMP:
                return MALI_WRAP_MIRRORED_CLAMP;

        case PIPE_TEX_WRAP_MIRROR_CLAMP_TO_EDGE:
                return MALI_WRAP_MIRRORED_CLAMP_TO_EDGE;

        case PIPE_TEX_WRAP_MIRROR_CLAMP_TO_BORDER:
                return MALI_WRAP_MIRRORED_CLAMP_TO_BORDER;

        default:
                unreachable("Invalid wrap");
        }
}

static unsigned
panfrost_translate_compare_func(enum pipe_compare_func in)
{
        switch (in) {
        case PIPE_FUNC_NEVER:
                return MALI_FUNC_NEVER;

        case PIPE_FUNC_LESS:
                return MALI_FUNC_LESS;

        case PIPE_FUNC_EQUAL:
                return MALI_FUNC_EQUAL;

        case PIPE_FUNC_LEQUAL:
                return MALI_FUNC_LEQUAL;

        case PIPE_FUNC_GREATER:
                return MALI_FUNC_GREATER;

        case PIPE_FUNC_NOTEQUAL:
                return MALI_FUNC_NOTEQUAL;

        case PIPE_FUNC_GEQUAL:
                return MALI_FUNC_GEQUAL;

        case PIPE_FUNC_ALWAYS:
                return MALI_FUNC_ALWAYS;

        default:
                unreachable("Invalid func");
        }
}

static unsigned
panfrost_translate_stencil_op(enum pipe_stencil_op in)
{
        switch (in) {
        case PIPE_STENCIL_OP_KEEP:
                return MALI_STENCIL_KEEP;

        case PIPE_STENCIL_OP_ZERO:
                return MALI_STENCIL_ZERO;

        case PIPE_STENCIL_OP_REPLACE:
                return MALI_STENCIL_REPLACE;

        case PIPE_STENCIL_OP_INCR:
                return MALI_STENCIL_INCR;

        case PIPE_STENCIL_OP_DECR:
                return MALI_STENCIL_DECR;

        case PIPE_STENCIL_OP_INCR_WRAP:
                return MALI_STENCIL_INCR_WRAP;

        case PIPE_STENCIL_OP_DECR_WRAP:
                return MALI_STENCIL_DECR_WRAP;

        case PIPE_STENCIL_OP_INVERT:
                return MALI_STENCIL_INVERT;

        default:
                unreachable("Invalid stencil op");
        }
}

static void
panfrost_make_stencil_state(const struct pipe_stencil_state *in, struct mali_stencil_test *out)
{
        out->ref = 0; /* Gallium gets it from elsewhere */

        out->mask = in->valuemask;
        out->func = panfrost_translate_compare_func(in->func);
        out->sfail = panfrost_translate_stencil_op(in->fail_op);
        out->dpfail = panfrost_translate_stencil_op(in->zfail_op);
        out->dppass = panfrost_translate_stencil_op(in->zpass_op);
}

static void
panfrost_default_shader_backend(struct panfrost_context *ctx)
{
        struct panfrost_screen *screen = pan_screen(ctx->base.screen);
        struct mali_shader_meta shader = {
                .alpha_coverage = ~MALI_ALPHA_COVERAGE(0.000000),

                .unknown2_3 = MALI_DEPTH_FUNC(MALI_FUNC_ALWAYS) | 0x3010,
                .unknown2_4 = MALI_NO_MSAA | 0x4e0,
        };

        /* unknown2_4 has 0x10 bit set on T6XX and T720. We don't know why this is
         * required (independent of 32-bit/64-bit descriptors), or why it's not
         * used on later GPU revisions. Otherwise, all shader jobs fault on
         * these earlier chips (perhaps this is a chicken bit of some kind).
         * More investigation is needed. */

        if (screen->quirks & MIDGARD_SFBD)
                shader.unknown2_4 |= 0x10;

        struct pipe_stencil_state default_stencil = {
                .enabled = 0,
                .func = PIPE_FUNC_ALWAYS,
                .fail_op = MALI_STENCIL_KEEP,
                .zfail_op = MALI_STENCIL_KEEP,
                .zpass_op = MALI_STENCIL_KEEP,
                .writemask = 0xFF,
                .valuemask = 0xFF
        };

        panfrost_make_stencil_state(&default_stencil, &shader.stencil_front);
        shader.stencil_mask_front = default_stencil.writemask;

        panfrost_make_stencil_state(&default_stencil, &shader.stencil_back);
        shader.stencil_mask_back = default_stencil.writemask;

        if (default_stencil.enabled)
                shader.unknown2_4 |= MALI_STENCIL_TEST;

        memcpy(&ctx->fragment_shader_core, &shader, sizeof(shader));
}

static bool
panfrost_writes_point_size(struct panfrost_context *ctx)
{
        assert(ctx->shader[PIPE_SHADER_VERTEX]);
        struct panfrost_shader_state *vs = &ctx->shader[PIPE_SHADER_VERTEX]->variants[ctx->shader[PIPE_SHADER_VERTEX]->active_variant];

        return vs->writes_point_size && ctx->payloads[PIPE_SHADER_FRAGMENT].prefix.draw_mode == MALI_POINTS;
}

/* Stage the attribute descriptors so we can adjust src_offset
 * to let BOs align nicely */

static void
panfrost_stage_attributes(struct panfrost_context *ctx)
{
        struct panfrost_batch *batch = panfrost_get_batch_for_fbo(ctx);
        struct panfrost_vertex_state *so = ctx->vertex;

        size_t sz = sizeof(struct mali_attr_meta) * PAN_MAX_ATTRIBUTE;
        struct panfrost_transfer transfer = panfrost_allocate_transient(batch, sz);
        struct mali_attr_meta *target = (struct mali_attr_meta *) transfer.cpu;

        /* Copy as-is for the first pass */
        memcpy(target, so->hw, sz);

        /* Fixup offsets for the second pass. Recall that the hardware
         * calculates attribute addresses as:
         *
         *      addr = base + (stride * vtx) + src_offset;
         *
         * However, on Mali, base must be aligned to 64-bytes, so we
         * instead let:
         *
         *      base' = base & ~63 = base - (base & 63)
         *
         * To compensate when using base' (see emit_vertex_data), we have
         * to adjust src_offset by the masked off piece:
         *
         *      addr' = base' + (stride * vtx) + (src_offset + (base & 63))
         *            = base - (base & 63) + (stride * vtx) + src_offset + (base & 63)
         *            = base + (stride * vtx) + src_offset
         *            = addr;
         *
         * QED.
         */

        unsigned start = ctx->payloads[PIPE_SHADER_VERTEX].offset_start;

        for (unsigned i = 0; i < so->num_elements; ++i) {
                unsigned vbi = so->pipe[i].vertex_buffer_index;
                struct pipe_vertex_buffer *buf = &ctx->vertex_buffers[vbi];
                struct panfrost_resource *rsrc = (struct panfrost_resource *) (buf->buffer.resource);
                mali_ptr addr = rsrc->bo->gpu + buf->buffer_offset;

                /* Adjust by the masked off bits of the offset. Make sure we
                 * read src_offset from so->hw (which is not GPU visible)
                 * rather than target (which is) due to caching effects */

                unsigned src_offset = so->hw[i].src_offset;
                src_offset += (addr & 63);

                /* Also, somewhat obscurely per-instance data needs to be
                 * offset in response to a delayed start in an indexed draw */

                if (so->pipe[i].instance_divisor && ctx->instance_count > 1 && start)
                        src_offset -= buf->stride * start;

                target[i].src_offset = src_offset;
        }

        /* Let's also include vertex builtins */

        struct mali_attr_meta builtin = {
                .format = MALI_R32UI,
                .swizzle = panfrost_get_default_swizzle(1)
        };

        /* See mali_attr_meta specification for the magic number */
        memcpy(&target[PAN_VERTEX_ID], &builtin, 4);
        memcpy(&target[PAN_INSTANCE_ID], &builtin, 4);

        ctx->payloads[PIPE_SHADER_VERTEX].postfix.attribute_meta = transfer.gpu;
}

static void
panfrost_upload_sampler_descriptors(struct panfrost_context *ctx)
{
        struct panfrost_batch *batch = panfrost_get_batch_for_fbo(ctx);
        size_t desc_size = sizeof(struct mali_sampler_descriptor);

        for (int t = 0; t <= PIPE_SHADER_FRAGMENT; ++t) {
                mali_ptr upload = 0;

                if (ctx->sampler_count[t]) {
                        size_t transfer_size = desc_size * ctx->sampler_count[t];

                        struct panfrost_transfer transfer =
                                panfrost_allocate_transient(batch, transfer_size);

                        struct mali_sampler_descriptor *desc =
                                (struct mali_sampler_descriptor *) transfer.cpu;

                        for (int i = 0; i < ctx->sampler_count[t]; ++i)
                                desc[i] = ctx->samplers[t][i]->hw;

                        upload = transfer.gpu;
                }

                ctx->payloads[t].postfix.sampler_descriptor = upload;
        }
}

static mali_ptr
panfrost_upload_tex(
        struct panfrost_context *ctx,
        enum pipe_shader_type st,
        struct panfrost_sampler_view *view)
{
        if (!view)
                return (mali_ptr) 0;

        struct pipe_sampler_view *pview = &view->base;
        struct panfrost_resource *rsrc = pan_resource(pview->texture);
        mali_ptr descriptor_gpu;
        void *descriptor;

        /* Do we interleave an explicit stride with every element? */

        bool has_manual_stride = view->manual_stride;

        /* For easy access */

        bool is_buffer = pview->target == PIPE_BUFFER;
        unsigned first_level = is_buffer ? 0 : pview->u.tex.first_level;
        unsigned last_level  = is_buffer ? 0 : pview->u.tex.last_level;
        unsigned first_layer = is_buffer ? 0 : pview->u.tex.first_layer;
        unsigned last_layer  = is_buffer ? 0 : pview->u.tex.last_layer;
        unsigned first_face  = 0;
        unsigned last_face   = 0;
        unsigned face_mult   = 1;

        /* Cubemaps have 6 faces as layers in between each actual layer.
         * There's a bit of an impedence mismatch between Gallium and the
         * hardware, let's fixup for it */

        if (pview->target == PIPE_TEXTURE_CUBE || pview->target == PIPE_TEXTURE_CUBE_ARRAY) {
                /* TODO: logic wrong in the asserted out cases ... can they happen? */

                first_face = first_layer % 6;
                last_face = last_layer % 6;
                first_layer /= 6;
                last_layer /= 6;

                assert((first_layer == last_layer) || (first_face == 0 && last_face == 5));
                face_mult = 6;
        }

        /* Lower-bit is set when sampling from colour AFBC */
        bool is_afbc = rsrc->layout == MALI_TEXTURE_AFBC;
        bool is_zs = rsrc->base.bind & PIPE_BIND_DEPTH_STENCIL;
        unsigned afbc_bit = (is_afbc && !is_zs) ? 1 : 0;

        /* Add the BO to the job so it's retained until the job is done. */
        struct panfrost_batch *batch = panfrost_get_batch_for_fbo(ctx);
        panfrost_batch_add_bo(batch, rsrc->bo,
                              PAN_BO_ACCESS_SHARED | PAN_BO_ACCESS_READ |
                              panfrost_bo_access_for_stage(st));

        /* Add the usage flags in, since they can change across the CSO
         * lifetime due to layout switches */

        view->hw.format.layout = rsrc->layout;
        view->hw.format.manual_stride = has_manual_stride;

        /* Inject the addresses in, interleaving array indices, mip levels,
         * cube faces, and strides in that order */

        unsigned idx = 0;
        unsigned levels = 1 + last_level - first_level;
        unsigned layers = 1 + last_layer - first_layer;
        unsigned faces  = 1 + last_face  - first_face;
        unsigned num_elements = levels * layers * faces;
        if (has_manual_stride)
                num_elements *= 2;

        descriptor = malloc(sizeof(struct mali_texture_descriptor) +
                            sizeof(mali_ptr) * num_elements);
        memcpy(descriptor, &view->hw, sizeof(struct mali_texture_descriptor));

        mali_ptr *pointers_and_strides = descriptor +
                                         sizeof(struct mali_texture_descriptor);

        for (unsigned w = first_layer; w <= last_layer; ++w) {
                for (unsigned l = first_level; l <= last_level; ++l) {
                        for (unsigned f = first_face; f <= last_face; ++f) {
                                pointers_and_strides[idx++] =
                                        panfrost_get_texture_address(rsrc, l, w * face_mult + f)
                                                + afbc_bit + view->astc_stretch;
                                if (has_manual_stride) {
                                        pointers_and_strides[idx++] =
                                                rsrc->slices[l].stride;
                                }
                        }
                }
        }

        descriptor_gpu = panfrost_upload_transient(batch, descriptor,
                                  sizeof(struct mali_texture_descriptor) +
                                          num_elements * sizeof(*pointers_and_strides));
        free(descriptor);

        return descriptor_gpu;
}

static void
panfrost_upload_texture_descriptors(struct panfrost_context *ctx)
{
        struct panfrost_batch *batch = panfrost_get_batch_for_fbo(ctx);

        for (int t = 0; t <= PIPE_SHADER_FRAGMENT; ++t) {
                mali_ptr trampoline = 0;

                if (ctx->sampler_view_count[t]) {
                        uint64_t trampolines[PIPE_MAX_SHADER_SAMPLER_VIEWS];

                        for (int i = 0; i < ctx->sampler_view_count[t]; ++i)
                                trampolines[i] =
                                        panfrost_upload_tex(ctx, t, ctx->sampler_views[t][i]);

                        trampoline = panfrost_upload_transient(batch, trampolines, sizeof(uint64_t) * ctx->sampler_view_count[t]);
                }

                ctx->payloads[t].postfix.texture_trampoline = trampoline;
        }
}

struct sysval_uniform {
        union {
                float f[4];
                int32_t i[4];
                uint32_t u[4];
                uint64_t du[2];
        };
};

static void panfrost_upload_viewport_scale_sysval(struct panfrost_context *ctx,
                struct sysval_uniform *uniform)
{
        const struct pipe_viewport_state *vp = &ctx->pipe_viewport;

        uniform->f[0] = vp->scale[0];
        uniform->f[1] = vp->scale[1];
        uniform->f[2] = vp->scale[2];
}

static void panfrost_upload_viewport_offset_sysval(struct panfrost_context *ctx,
                struct sysval_uniform *uniform)
{
        const struct pipe_viewport_state *vp = &ctx->pipe_viewport;

        uniform->f[0] = vp->translate[0];
        uniform->f[1] = vp->translate[1];
        uniform->f[2] = vp->translate[2];
}

static void panfrost_upload_txs_sysval(struct panfrost_context *ctx,
                                       enum pipe_shader_type st,
                                       unsigned int sysvalid,
                                       struct sysval_uniform *uniform)
{
        unsigned texidx = PAN_SYSVAL_ID_TO_TXS_TEX_IDX(sysvalid);
        unsigned dim = PAN_SYSVAL_ID_TO_TXS_DIM(sysvalid);
        bool is_array = PAN_SYSVAL_ID_TO_TXS_IS_ARRAY(sysvalid);
        struct pipe_sampler_view *tex = &ctx->sampler_views[st][texidx]->base;

        assert(dim);
        uniform->i[0] = u_minify(tex->texture->width0, tex->u.tex.first_level);

        if (dim > 1)
                uniform->i[1] = u_minify(tex->texture->height0,
                                         tex->u.tex.first_level);

        if (dim > 2)
                uniform->i[2] = u_minify(tex->texture->depth0,
                                         tex->u.tex.first_level);

        if (is_array)
                uniform->i[dim] = tex->texture->array_size;
}

static void panfrost_upload_ssbo_sysval(
        struct panfrost_context *ctx,
        enum pipe_shader_type st,
        unsigned ssbo_id,
        struct sysval_uniform *uniform)
{
        assert(ctx->ssbo_mask[st] & (1 << ssbo_id));
        struct pipe_shader_buffer sb = ctx->ssbo[st][ssbo_id];

        /* Compute address */
        struct panfrost_batch *batch = panfrost_get_batch_for_fbo(ctx);
        struct panfrost_bo *bo = pan_resource(sb.buffer)->bo;

        panfrost_batch_add_bo(batch, bo,
                              PAN_BO_ACCESS_SHARED | PAN_BO_ACCESS_RW |
                              panfrost_bo_access_for_stage(st));

        /* Upload address and size as sysval */
        uniform->du[0] = bo->gpu + sb.buffer_offset;
        uniform->u[2] = sb.buffer_size;
}

static void
panfrost_upload_sampler_sysval(
                struct panfrost_context *ctx,
                enum pipe_shader_type st,
                unsigned sampler_index,
                struct sysval_uniform *uniform)
{
        struct pipe_sampler_state *sampl =
                &ctx->samplers[st][sampler_index]->base;

        uniform->f[0] = sampl->min_lod;
        uniform->f[1] = sampl->max_lod;
        uniform->f[2] = sampl->lod_bias;

        /* Even without any errata, Midgard represents "no mipmapping" as
         * fixing the LOD with the clamps; keep behaviour consistent. c.f.
         * panfrost_create_sampler_state which also explains our choice of
         * epsilon value (again to keep behaviour consistent) */

        if (sampl->min_mip_filter == PIPE_TEX_MIPFILTER_NONE)
                uniform->f[1] = uniform->f[0] + (1.0/256.0);
}

static void panfrost_upload_num_work_groups_sysval(struct panfrost_context *ctx,
                struct sysval_uniform *uniform)
{
        uniform->u[0] = ctx->compute_grid->grid[0];
        uniform->u[1] = ctx->compute_grid->grid[1];
        uniform->u[2] = ctx->compute_grid->grid[2];
}

static void panfrost_upload_sysvals(struct panfrost_context *ctx, void *buf,
                                    struct panfrost_shader_state *ss,
                                    enum pipe_shader_type st)
{
        struct sysval_uniform *uniforms = (void *)buf;

        for (unsigned i = 0; i < ss->sysval_count; ++i) {
                int sysval = ss->sysval[i];

                switch (PAN_SYSVAL_TYPE(sysval)) {
                case PAN_SYSVAL_VIEWPORT_SCALE:
                        panfrost_upload_viewport_scale_sysval(ctx, &uniforms[i]);
                        break;
                case PAN_SYSVAL_VIEWPORT_OFFSET:
                        panfrost_upload_viewport_offset_sysval(ctx, &uniforms[i]);
                        break;
                case PAN_SYSVAL_TEXTURE_SIZE:
                        panfrost_upload_txs_sysval(ctx, st, PAN_SYSVAL_ID(sysval),
                                                   &uniforms[i]);
                        break;
                case PAN_SYSVAL_SSBO:
                        panfrost_upload_ssbo_sysval(ctx, st, PAN_SYSVAL_ID(sysval),
                                                    &uniforms[i]);
                        break;
                case PAN_SYSVAL_NUM_WORK_GROUPS:
                        panfrost_upload_num_work_groups_sysval(ctx, &uniforms[i]);
                        break;
                case PAN_SYSVAL_SAMPLER:
                        panfrost_upload_sampler_sysval(ctx, st, PAN_SYSVAL_ID(sysval),
                                                    &uniforms[i]);
                        break;
                default:
                        assert(0);
                }
        }
}

static const void *
panfrost_map_constant_buffer_cpu(struct panfrost_constant_buffer *buf, unsigned index)
{
        struct pipe_constant_buffer *cb = &buf->cb[index];
        struct panfrost_resource *rsrc = pan_resource(cb->buffer);

        if (rsrc)
                return rsrc->bo->cpu;
        else if (cb->user_buffer)
                return cb->user_buffer;
        else
                unreachable("No constant buffer");
}

static mali_ptr
panfrost_map_constant_buffer_gpu(
        struct panfrost_context *ctx,
        enum pipe_shader_type st,
        struct panfrost_constant_buffer *buf,
        unsigned index)
{
        struct pipe_constant_buffer *cb = &buf->cb[index];
        struct panfrost_resource *rsrc = pan_resource(cb->buffer);
        struct panfrost_batch *batch = panfrost_get_batch_for_fbo(ctx);

        if (rsrc) {
                panfrost_batch_add_bo(batch, rsrc->bo,
                                      PAN_BO_ACCESS_SHARED |
                                      PAN_BO_ACCESS_READ |
                                      panfrost_bo_access_for_stage(st));

                /* Alignment gauranteed by PIPE_CAP_CONSTANT_BUFFER_OFFSET_ALIGNMENT */
                return rsrc->bo->gpu + cb->buffer_offset;
        } else if (cb->user_buffer) {
                return panfrost_upload_transient(batch, cb->user_buffer + cb->buffer_offset, cb->buffer_size);
        } else {
                unreachable("No constant buffer");
        }
}

/* Compute number of UBOs active (more specifically, compute the highest UBO
 * number addressable -- if there are gaps, include them in the count anyway).
 * We always include UBO #0 in the count, since we *need* uniforms enabled for
 * sysvals. */

static unsigned
panfrost_ubo_count(struct panfrost_context *ctx, enum pipe_shader_type stage)
{
        unsigned mask = ctx->constant_buffer[stage].enabled_mask | 1;
        return 32 - __builtin_clz(mask);
}

/* Fixes up a shader state with current state */

static void
panfrost_patch_shader_state(struct panfrost_context *ctx,
                            enum pipe_shader_type stage)
{
        struct panfrost_shader_variants *all = ctx->shader[stage];

        if (!all) {
                ctx->payloads[stage].postfix.shader = 0;
                return;
        }

        struct panfrost_shader_state *ss = &all->variants[all->active_variant];

        ss->tripipe->texture_count = ctx->sampler_view_count[stage];
        ss->tripipe->sampler_count = ctx->sampler_count[stage];

        ss->tripipe->midgard1.flags_lo = 0x220;

        unsigned ubo_count = panfrost_ubo_count(ctx, stage);
        ss->tripipe->midgard1.uniform_buffer_count = ubo_count;

        struct panfrost_batch *batch = panfrost_get_batch_for_fbo(ctx);

        /* Add the shader BO to the batch. */
        panfrost_batch_add_bo(batch, ss->bo,
                              PAN_BO_ACCESS_PRIVATE |
                              PAN_BO_ACCESS_READ |
                              panfrost_bo_access_for_stage(stage));

        ctx->payloads[stage].postfix.shader = panfrost_upload_transient(batch,
                                        ss->tripipe,
                                        sizeof(struct mali_shader_meta));
}

/* Go through dirty flags and actualise them in the cmdstream. */

void
panfrost_emit_for_draw(struct panfrost_context *ctx, bool with_vertex_data)
{
        struct panfrost_batch *batch = panfrost_get_batch_for_fbo(ctx);
        struct panfrost_screen *screen = pan_screen(ctx->base.screen);

        panfrost_batch_add_fbo_bos(batch);
        panfrost_attach_vt_framebuffer(ctx);

        if (with_vertex_data) {
                panfrost_emit_vertex_data(batch);

                /* Varyings emitted for -all- geometry */
                unsigned total_count = ctx->padded_count * ctx->instance_count;
                panfrost_emit_varying_descriptor(ctx, total_count);
        }


        if (ctx->rasterizer) {
                bool msaa = ctx->rasterizer->base.multisample;
                ctx->payloads[PIPE_SHADER_FRAGMENT].gl_enables = ctx->rasterizer->tiler_gl_enables;

                /* TODO: Sample size */
                SET_BIT(ctx->fragment_shader_core.unknown2_3, MALI_HAS_MSAA, msaa);
                SET_BIT(ctx->fragment_shader_core.unknown2_4, MALI_NO_MSAA, !msaa);
        }

        panfrost_batch_set_requirements(batch);

        if (ctx->occlusion_query) {
                ctx->payloads[PIPE_SHADER_FRAGMENT].gl_enables |= MALI_OCCLUSION_QUERY;
                ctx->payloads[PIPE_SHADER_FRAGMENT].postfix.occlusion_counter = ctx->occlusion_query->bo->gpu;
        }

        panfrost_patch_shader_state(ctx, PIPE_SHADER_VERTEX);
        panfrost_patch_shader_state(ctx, PIPE_SHADER_COMPUTE);

        if (ctx->shader[PIPE_SHADER_VERTEX] && ctx->shader[PIPE_SHADER_FRAGMENT]) {
                /* Check if we need to link the gl_PointSize varying */
                if (!panfrost_writes_point_size(ctx)) {
                        /* If the size is constant, write it out. Otherwise,
                         * don't touch primitive_size (since we would clobber
                         * the pointer there) */

                        bool points = ctx->payloads[PIPE_SHADER_FRAGMENT].prefix.draw_mode == MALI_POINTS;

                        ctx->payloads[PIPE_SHADER_FRAGMENT].primitive_size.constant = points ?
                                ctx->rasterizer->base.point_size :
                                ctx->rasterizer->base.line_width;
                }
        }

        if (ctx->shader[PIPE_SHADER_FRAGMENT]) {
                struct panfrost_shader_state *variant = &ctx->shader[PIPE_SHADER_FRAGMENT]->variants[ctx->shader[PIPE_SHADER_FRAGMENT]->active_variant];

                panfrost_patch_shader_state(ctx, PIPE_SHADER_FRAGMENT);

#define COPY(name) ctx->fragment_shader_core.name = variant->tripipe->name

                COPY(shader);
                COPY(attribute_count);
                COPY(varying_count);
                COPY(texture_count);
                COPY(sampler_count);
                COPY(midgard1.uniform_count);
                COPY(midgard1.uniform_buffer_count);
                COPY(midgard1.work_count);
                COPY(midgard1.flags_lo);
                COPY(midgard1.flags_hi);

#undef COPY

                /* Get blending setup */
                unsigned rt_count = MAX2(ctx->pipe_framebuffer.nr_cbufs, 1);

                struct panfrost_blend_final blend[PIPE_MAX_COLOR_BUFS];
                unsigned shader_offset = 0;
                struct panfrost_bo *shader_bo = NULL;

                for (unsigned c = 0; c < rt_count; ++c) {
                        blend[c] = panfrost_get_blend_for_context(ctx, c, &shader_bo, &shader_offset);
                }

                /* If there is a blend shader, work registers are shared. XXX: opt */

                for (unsigned c = 0; c < rt_count; ++c) {
                        if (blend[c].is_shader)
                                ctx->fragment_shader_core.midgard1.work_count = 16;
                }

                /* Depending on whether it's legal to in the given shader, we
                 * try to enable early-z testing (or forward-pixel kill?) */

                SET_BIT(ctx->fragment_shader_core.midgard1.flags_lo, MALI_EARLY_Z,
                        !variant->can_discard && !variant->writes_depth);

                /* Add the writes Z/S flags if needed. */
                SET_BIT(ctx->fragment_shader_core.midgard1.flags_lo,
                        MALI_WRITES_Z, variant->writes_depth);
                SET_BIT(ctx->fragment_shader_core.midgard1.flags_hi,
                        MALI_WRITES_S, variant->writes_stencil);

                /* Any time texturing is used, derivatives are implicitly
                 * calculated, so we need to enable helper invocations */

                SET_BIT(ctx->fragment_shader_core.midgard1.flags_lo, MALI_HELPER_INVOCATIONS, variant->helper_invocations);

                /* Assign the stencil refs late */

                unsigned front_ref = ctx->stencil_ref.ref_value[0];
                unsigned back_ref = ctx->stencil_ref.ref_value[1];
                bool back_enab = ctx->depth_stencil->stencil[1].enabled;

                ctx->fragment_shader_core.stencil_front.ref = front_ref;
                ctx->fragment_shader_core.stencil_back.ref = back_enab ? back_ref : front_ref;

                /* CAN_DISCARD should be set if the fragment shader possibly
                 * contains a 'discard' instruction. It is likely this is
                 * related to optimizations related to forward-pixel kill, as
                 * per "Mali Performance 3: Is EGL_BUFFER_PRESERVED a good
                 * thing?" by Peter Harris
                 */

                SET_BIT(ctx->fragment_shader_core.unknown2_3, MALI_CAN_DISCARD, variant->can_discard);
                SET_BIT(ctx->fragment_shader_core.midgard1.flags_lo, 0x400, variant->can_discard);

                /* Even on MFBD, the shader descriptor gets blend shaders. It's
                 * *also* copied to the blend_meta appended (by convention),
                 * but this is the field actually read by the hardware. (Or
                 * maybe both are read...?). Specify the last RTi with a blend
                 * shader. */

                ctx->fragment_shader_core.blend.shader = 0;

                for (signed rt = (rt_count - 1); rt >= 0; --rt) {
                        if (blend[rt].is_shader) {
                                ctx->fragment_shader_core.blend.shader =
                                        blend[rt].shader.gpu | blend[rt].shader.first_tag;
                                break;
                        }
                }

                if (screen->quirks & MIDGARD_SFBD) {
                        /* When only a single render target platform is used, the blend
                         * information is inside the shader meta itself. We
                         * additionally need to signal CAN_DISCARD for nontrivial blend
                         * modes (so we're able to read back the destination buffer) */

                        SET_BIT(ctx->fragment_shader_core.unknown2_3, MALI_HAS_BLEND_SHADER, blend[0].is_shader);

                        if (!blend[0].is_shader) {
                                ctx->fragment_shader_core.blend.equation =
                                        *blend[0].equation.equation;
                                ctx->fragment_shader_core.blend.constant =
                                        blend[0].equation.constant;
                        }

                        SET_BIT(ctx->fragment_shader_core.unknown2_3, MALI_CAN_DISCARD, !blend[0].no_blending);
                }

                size_t size = sizeof(struct mali_shader_meta) + (sizeof(struct midgard_blend_rt) * rt_count);
                struct panfrost_transfer transfer = panfrost_allocate_transient(batch, size);
                memcpy(transfer.cpu, &ctx->fragment_shader_core, sizeof(struct mali_shader_meta));

                ctx->payloads[PIPE_SHADER_FRAGMENT].postfix.shader = transfer.gpu;

                if (!(screen->quirks & MIDGARD_SFBD)) {
                        /* Additional blend descriptor tacked on for jobs using MFBD */

                        struct midgard_blend_rt rts[4];

                        for (unsigned i = 0; i < rt_count; ++i) {
                                rts[i].flags = 0x200;

                                bool is_srgb =
                                        (ctx->pipe_framebuffer.nr_cbufs > i) &&
                                        (ctx->pipe_framebuffer.cbufs[i]) &&
                                        util_format_is_srgb(ctx->pipe_framebuffer.cbufs[i]->format);

                                SET_BIT(rts[i].flags, MALI_BLEND_MRT_SHADER, blend[i].is_shader);
                                SET_BIT(rts[i].flags, MALI_BLEND_LOAD_TIB, !blend[i].no_blending);
                                SET_BIT(rts[i].flags, MALI_BLEND_SRGB, is_srgb);
                                SET_BIT(rts[i].flags, MALI_BLEND_NO_DITHER, !ctx->blend->base.dither);

                                if (blend[i].is_shader) {
                                        rts[i].blend.shader = blend[i].shader.gpu | blend[i].shader.first_tag;
                                } else {
                                        rts[i].blend.equation = *blend[i].equation.equation;
                                        rts[i].blend.constant = blend[i].equation.constant;
                                }
                        }

                        memcpy(transfer.cpu + sizeof(struct mali_shader_meta), rts, sizeof(rts[0]) * rt_count);
                }
        }

        /* We stage to transient, so always dirty.. */
        if (ctx->vertex)
                panfrost_stage_attributes(ctx);

        panfrost_upload_sampler_descriptors(ctx);
        panfrost_upload_texture_descriptors(ctx);

        const struct pipe_viewport_state *vp = &ctx->pipe_viewport;

        for (int i = 0; i < PIPE_SHADER_TYPES; ++i) {
                struct panfrost_shader_variants *all = ctx->shader[i];

                if (!all)
                        continue;

                struct panfrost_constant_buffer *buf = &ctx->constant_buffer[i];

                struct panfrost_shader_state *ss = &all->variants[all->active_variant];

                /* Uniforms are implicitly UBO #0 */
                bool has_uniforms = buf->enabled_mask & (1 << 0);

                /* Allocate room for the sysval and the uniforms */
                size_t sys_size = sizeof(float) * 4 * ss->sysval_count;
                size_t uniform_size = has_uniforms ? (buf->cb[0].buffer_size) : 0;
                size_t size = sys_size + uniform_size;
                struct panfrost_transfer transfer = panfrost_allocate_transient(batch, size);

                /* Upload sysvals requested by the shader */
                panfrost_upload_sysvals(ctx, transfer.cpu, ss, i);

                /* Upload uniforms */
                if (has_uniforms && uniform_size) {
                        const void *cpu = panfrost_map_constant_buffer_cpu(buf, 0);
                        memcpy(transfer.cpu + sys_size, cpu, uniform_size);
                }

                int uniform_count =
                        ctx->shader[i]->variants[ctx->shader[i]->active_variant].uniform_count;

                struct mali_vertex_tiler_postfix *postfix =
                        &ctx->payloads[i].postfix;

                /* Next up, attach UBOs. UBO #0 is the uniforms we just
                 * uploaded */

                unsigned ubo_count = panfrost_ubo_count(ctx, i);
                assert(ubo_count >= 1);

                size_t sz = sizeof(uint64_t) * ubo_count;
                uint64_t ubos[PAN_MAX_CONST_BUFFERS];

                /* Upload uniforms as a UBO */
                ubos[0] = MALI_MAKE_UBO(2 + uniform_count, transfer.gpu);

                /* The rest are honest-to-goodness UBOs */

                for (unsigned ubo = 1; ubo < ubo_count; ++ubo) {
                        size_t usz = buf->cb[ubo].buffer_size;

                        bool enabled = buf->enabled_mask & (1 << ubo);
                        bool empty = usz == 0;

                        if (!enabled || empty) {
                                /* Stub out disabled UBOs to catch accesses */
                                ubos[ubo] = MALI_MAKE_UBO(0, 0xDEAD0000);
                                continue;
                        }

                        mali_ptr gpu = panfrost_map_constant_buffer_gpu(ctx, i, buf, ubo);

                        unsigned bytes_per_field = 16;
                        unsigned aligned = ALIGN_POT(usz, bytes_per_field);
                        ubos[ubo] = MALI_MAKE_UBO(aligned / bytes_per_field, gpu);
                }

                mali_ptr ubufs = panfrost_upload_transient(batch, ubos, sz);
                postfix->uniforms = transfer.gpu;
                postfix->uniform_buffers = ubufs;

                buf->dirty_mask = 0;
        }

        /* TODO: Upload the viewport somewhere more appropriate */

        /* Clip bounds are encoded as floats. The viewport itself is encoded as
         * (somewhat) asymmetric ints. */
        const struct pipe_scissor_state *ss = &ctx->scissor;

        struct mali_viewport view = {
                /* By default, do no viewport clipping, i.e. clip to (-inf,
                 * inf) in each direction. Clipping to the viewport in theory
                 * should work, but in practice causes issues when we're not
                 * explicitly trying to scissor */

                .clip_minx = -INFINITY,
                .clip_miny = -INFINITY,
                .clip_maxx = INFINITY,
                .clip_maxy = INFINITY,
        };

        /* Always scissor to the viewport by default. */
        float vp_minx = (int) (vp->translate[0] - fabsf(vp->scale[0]));
        float vp_maxx = (int) (vp->translate[0] + fabsf(vp->scale[0]));

        float vp_miny = (int) (vp->translate[1] - fabsf(vp->scale[1]));
        float vp_maxy = (int) (vp->translate[1] + fabsf(vp->scale[1]));

        float minz = (vp->translate[2] - fabsf(vp->scale[2]));
        float maxz = (vp->translate[2] + fabsf(vp->scale[2]));

        /* Apply the scissor test */

        unsigned minx, miny, maxx, maxy;

        if (ss && ctx->rasterizer && ctx->rasterizer->base.scissor) {
                minx = MAX2(ss->minx, vp_minx);
                miny = MAX2(ss->miny, vp_miny);
                maxx = MIN2(ss->maxx, vp_maxx);
                maxy = MIN2(ss->maxy, vp_maxy);
        } else {
                minx = vp_minx;
                miny = vp_miny;
                maxx = vp_maxx;
                maxy = vp_maxy;
        }

        /* Hardware needs the min/max to be strictly ordered, so flip if we
         * need to. The viewport transformation in the vertex shader will
         * handle the negatives if we don't */

        if (miny > maxy) {
                unsigned temp = miny;
                miny = maxy;
                maxy = temp;
        }

        if (minx > maxx) {
                unsigned temp = minx;
                minx = maxx;
                maxx = temp;
        }

        if (minz > maxz) {
                float temp = minz;
                minz = maxz;
                maxz = temp;
        }

        /* Clamp to the framebuffer size as a last check */

        minx = MIN2(ctx->pipe_framebuffer.width, minx);
        maxx = MIN2(ctx->pipe_framebuffer.width, maxx);

        miny = MIN2(ctx->pipe_framebuffer.height, miny);
        maxy = MIN2(ctx->pipe_framebuffer.height, maxy);

        /* Update the job, unless we're doing wallpapering (whose lack of
         * scissor we can ignore, since if we "miss" a tile of wallpaper, it'll
         * just... be faster :) */

        if (!ctx->wallpaper_batch)
                panfrost_batch_union_scissor(batch, minx, miny, maxx, maxy);

        /* Upload */

        view.viewport0[0] = minx;
        view.viewport1[0] = MALI_POSITIVE(maxx);

        view.viewport0[1] = miny;
        view.viewport1[1] = MALI_POSITIVE(maxy);

        view.clip_minz = minz;
        view.clip_maxz = maxz;

        ctx->payloads[PIPE_SHADER_FRAGMENT].postfix.viewport =
                panfrost_upload_transient(batch,
                                          &view,
                                          sizeof(struct mali_viewport));
}

/* Corresponds to exactly one draw, but does not submit anything */

static void
panfrost_queue_draw(struct panfrost_context *ctx)
{
        /* Handle dirty flags now */
        panfrost_emit_for_draw(ctx, true);

        /* If rasterizer discard is enable, only submit the vertex */

        bool rasterizer_discard = ctx->rasterizer
                                  && ctx->rasterizer->base.rasterizer_discard;


        struct midgard_payload_vertex_tiler *vertex_payload = &ctx->payloads[PIPE_SHADER_VERTEX];
        struct midgard_payload_vertex_tiler *tiler_payload = &ctx->payloads[PIPE_SHADER_FRAGMENT];

        struct panfrost_batch *batch = panfrost_get_batch_for_fbo(ctx);
        bool wallpapering = ctx->wallpaper_batch && batch->tiler_dep;

        if (wallpapering) {
                /* Inject in reverse order, with "predicted" job indices. THIS IS A HACK XXX */
                panfrost_new_job(batch, JOB_TYPE_TILER, false, batch->job_index + 2, tiler_payload, sizeof(*tiler_payload), true);
                panfrost_new_job(batch, JOB_TYPE_VERTEX, false, 0, vertex_payload, sizeof(*vertex_payload), true);
        } else  {
                unsigned vertex = panfrost_new_job(batch, JOB_TYPE_VERTEX, false, 0, vertex_payload, sizeof(*vertex_payload), false);

                if (!rasterizer_discard)
                        panfrost_new_job(batch, JOB_TYPE_TILER, false, vertex, tiler_payload, sizeof(*tiler_payload), false);
        }

        for (unsigned i = 0; i < PIPE_SHADER_TYPES; ++i) {
                struct panfrost_shader_variants *all = ctx->shader[i];

                if (!all)
                        continue;

                struct panfrost_shader_state *ss = &all->variants[all->active_variant];
                batch->stack_size = MAX2(batch->stack_size, ss->stack_size);
        }
}

/* The entire frame is in memory -- send it off to the kernel! */

void
panfrost_flush(
        struct pipe_context *pipe,
        struct pipe_fence_handle **fence,
        unsigned flags)
{
        struct panfrost_context *ctx = pan_context(pipe);
        struct util_dynarray fences;

        /* We must collect the fences before the flush is done, otherwise we'll
         * lose track of them.
         */
        if (fence) {
                util_dynarray_init(&fences, NULL);
                hash_table_foreach(ctx->batches, hentry) {
                        struct panfrost_batch *batch = hentry->data;

                        panfrost_batch_fence_reference(batch->out_sync);
                        util_dynarray_append(&fences,
                                             struct panfrost_batch_fence *,
                                             batch->out_sync);
                }
        }

        /* Submit all pending jobs */
        panfrost_flush_all_batches(ctx, false);

        if (fence) {
                struct panfrost_fence *f = panfrost_fence_create(ctx, &fences);
                pipe->screen->fence_reference(pipe->screen, fence, NULL);
                *fence = (struct pipe_fence_handle *)f;

                util_dynarray_foreach(&fences, struct panfrost_batch_fence *, fence)
                        panfrost_batch_fence_unreference(*fence);

                util_dynarray_fini(&fences);
        }

        if (pan_debug & PAN_DBG_TRACE)
                pandecode_next_frame();
}

#define DEFINE_CASE(c) case PIPE_PRIM_##c: return MALI_##c;

static int
g2m_draw_mode(enum pipe_prim_type mode)
{
        switch (mode) {
                DEFINE_CASE(POINTS);
                DEFINE_CASE(LINES);
                DEFINE_CASE(LINE_LOOP);
                DEFINE_CASE(LINE_STRIP);
                DEFINE_CASE(TRIANGLES);
                DEFINE_CASE(TRIANGLE_STRIP);
                DEFINE_CASE(TRIANGLE_FAN);
                DEFINE_CASE(QUADS);
                DEFINE_CASE(QUAD_STRIP);
                DEFINE_CASE(POLYGON);

        default:
                unreachable("Invalid draw mode");
        }
}

#undef DEFINE_CASE

static unsigned
panfrost_translate_index_size(unsigned size)
{
        switch (size) {
        case 1:
                return MALI_DRAW_INDEXED_UINT8;

        case 2:
                return MALI_DRAW_INDEXED_UINT16;

        case 4:
                return MALI_DRAW_INDEXED_UINT32;

        default:
                unreachable("Invalid index size");
        }
}

/* Gets a GPU address for the associated index buffer. Only gauranteed to be
 * good for the duration of the draw (transient), could last longer */

static mali_ptr
panfrost_get_index_buffer_mapped(struct panfrost_context *ctx, const struct pipe_draw_info *info)
{
        struct panfrost_resource *rsrc = (struct panfrost_resource *) (info->index.resource);

        off_t offset = info->start * info->index_size;
        struct panfrost_batch *batch = panfrost_get_batch_for_fbo(ctx);

        if (!info->has_user_indices) {
                /* Only resources can be directly mapped */
                panfrost_batch_add_bo(batch, rsrc->bo,
                                      PAN_BO_ACCESS_SHARED |
                                      PAN_BO_ACCESS_READ |
                                      PAN_BO_ACCESS_VERTEX_TILER);
                return rsrc->bo->gpu + offset;
        } else {
                /* Otherwise, we need to upload to transient memory */
                const uint8_t *ibuf8 = (const uint8_t *) info->index.user;
                return panfrost_upload_transient(batch, ibuf8 + offset, info->count * info->index_size);
        }
}

static bool
panfrost_scissor_culls_everything(struct panfrost_context *ctx)
{
        const struct pipe_scissor_state *ss = &ctx->scissor;

        /* Check if we're scissoring at all */

        if (!(ctx->rasterizer && ctx->rasterizer->base.scissor))
                return false;

        return (ss->minx == ss->maxx) || (ss->miny == ss->maxy);
}

/* Count generated primitives (when there is no geom/tess shaders) for
 * transform feedback */

static void
panfrost_statistics_record(
                struct panfrost_context *ctx,
                const struct pipe_draw_info *info)
{
        if (!ctx->active_queries)
                return;

        uint32_t prims = u_prims_for_vertices(info->mode, info->count);
        ctx->prims_generated += prims;

        if (!ctx->streamout.num_targets)
                return;

        ctx->tf_prims_generated += prims;
}

static void
panfrost_draw_vbo(
        struct pipe_context *pipe,
        const struct pipe_draw_info *info)
{
        struct panfrost_context *ctx = pan_context(pipe);

        /* First of all, check the scissor to see if anything is drawn at all.
         * If it's not, we drop the draw (mostly a conformance issue;
         * well-behaved apps shouldn't hit this) */

        if (panfrost_scissor_culls_everything(ctx))
                return;

        int mode = info->mode;

        /* Fallback unsupported restart index */
        unsigned primitive_index = (1 << (info->index_size * 8)) - 1;

        if (info->primitive_restart && info->index_size
            && info->restart_index != primitive_index) {
                util_draw_vbo_without_prim_restart(pipe, info);
                return;
        }

        /* Fallback for unsupported modes */

        assert(ctx->rasterizer != NULL);

        if (!(ctx->draw_modes & (1 << mode))) {
                if (mode == PIPE_PRIM_QUADS && info->count == 4 && !ctx->rasterizer->base.flatshade) {
                        mode = PIPE_PRIM_TRIANGLE_FAN;
                } else {
                        if (info->count < 4) {
                                /* Degenerate case? */
                                return;
                        }

                        util_primconvert_save_rasterizer_state(ctx->primconvert, &ctx->rasterizer->base);
                        util_primconvert_draw_vbo(ctx->primconvert, info);
                        return;
                }
        }

        ctx->payloads[PIPE_SHADER_VERTEX].offset_start = info->start;
        ctx->payloads[PIPE_SHADER_FRAGMENT].offset_start = info->start;

        /* Now that we have a guaranteed terminating path, find the job.
         * Assignment commented out to prevent unused warning */

        /* struct panfrost_batch *batch = */ panfrost_get_batch_for_fbo(ctx);

        ctx->payloads[PIPE_SHADER_FRAGMENT].prefix.draw_mode = g2m_draw_mode(mode);

        /* Take into account a negative bias */
        ctx->vertex_count = info->count + abs(info->index_bias);
        ctx->instance_count = info->instance_count;
        ctx->active_prim = info->mode;

        /* For non-indexed draws, they're the same */
        unsigned vertex_count = ctx->vertex_count;

        unsigned draw_flags = 0;

        /* The draw flags interpret how primitive size is interpreted */

        if (panfrost_writes_point_size(ctx))
                draw_flags |= MALI_DRAW_VARYING_SIZE;

        if (info->primitive_restart)
                draw_flags |= MALI_DRAW_PRIMITIVE_RESTART_FIXED_INDEX;

        /* These doesn't make much sense */

        draw_flags |= 0x3000;

        if (ctx->rasterizer && ctx->rasterizer->base.flatshade_first)
                draw_flags |= MALI_DRAW_FLATSHADE_FIRST;

        panfrost_statistics_record(ctx, info);

        if (info->index_size) {
                /* Calculate the min/max index used so we can figure out how
                 * many times to invoke the vertex shader */

                /* Fetch / calculate index bounds */
                unsigned min_index = 0, max_index = 0;

                if (info->max_index == ~0u) {
                        u_vbuf_get_minmax_index(pipe, info, &min_index, &max_index);
                } else {
                        min_index = info->min_index;
                        max_index = info->max_index;
                }

                /* Use the corresponding values */
                vertex_count = max_index - min_index + 1;
                ctx->payloads[PIPE_SHADER_VERTEX].offset_start = min_index + info->index_bias;
                ctx->payloads[PIPE_SHADER_FRAGMENT].offset_start = min_index + info->index_bias;

                ctx->payloads[PIPE_SHADER_FRAGMENT].prefix.offset_bias_correction = -min_index;
                ctx->payloads[PIPE_SHADER_FRAGMENT].prefix.index_count = MALI_POSITIVE(info->count);

                draw_flags |= panfrost_translate_index_size(info->index_size);
                ctx->payloads[PIPE_SHADER_FRAGMENT].prefix.indices = panfrost_get_index_buffer_mapped(ctx, info);
        } else {
                /* Index count == vertex count, if no indexing is applied, as
                 * if it is internally indexed in the expected order */

                ctx->payloads[PIPE_SHADER_FRAGMENT].prefix.offset_bias_correction = 0;
                ctx->payloads[PIPE_SHADER_FRAGMENT].prefix.index_count = MALI_POSITIVE(ctx->vertex_count);

                /* Reverse index state */
                ctx->payloads[PIPE_SHADER_FRAGMENT].prefix.indices = (mali_ptr) 0;
        }

        /* Dispatch "compute jobs" for the vertex/tiler pair as (1,
         * vertex_count, 1) */

        panfrost_pack_work_groups_fused(
                &ctx->payloads[PIPE_SHADER_VERTEX].prefix,
                &ctx->payloads[PIPE_SHADER_FRAGMENT].prefix,
                1, vertex_count, info->instance_count,
                1, 1, 1);

        ctx->payloads[PIPE_SHADER_FRAGMENT].prefix.unknown_draw = draw_flags;

        /* Encode the padded vertex count */

        if (info->instance_count > 1) {
                ctx->padded_count = panfrost_padded_vertex_count(vertex_count);

                unsigned shift = __builtin_ctz(ctx->padded_count);
                unsigned k = ctx->padded_count >> (shift + 1);

                ctx->payloads[PIPE_SHADER_VERTEX].instance_shift = shift;
                ctx->payloads[PIPE_SHADER_FRAGMENT].instance_shift = shift;

                ctx->payloads[PIPE_SHADER_VERTEX].instance_odd = k;
                ctx->payloads[PIPE_SHADER_FRAGMENT].instance_odd = k;
        } else {
                ctx->padded_count = vertex_count;

                /* Reset instancing state */
                ctx->payloads[PIPE_SHADER_VERTEX].instance_shift = 0;
                ctx->payloads[PIPE_SHADER_VERTEX].instance_odd = 0;
                ctx->payloads[PIPE_SHADER_FRAGMENT].instance_shift = 0;
                ctx->payloads[PIPE_SHADER_FRAGMENT].instance_odd = 0;
        }

        /* Fire off the draw itself */
        panfrost_queue_draw(ctx);

        /* Increment transform feedback offsets */

        for (unsigned i = 0; i < ctx->streamout.num_targets; ++i) {
                unsigned output_count = u_stream_outputs_for_vertices(
                                ctx->active_prim, ctx->vertex_count);

                ctx->streamout.offsets[i] += output_count;
        }
}

/* CSO state */

static void
panfrost_generic_cso_delete(struct pipe_context *pctx, void *hwcso)
{
        free(hwcso);
}

static void *
panfrost_create_rasterizer_state(
        struct pipe_context *pctx,
        const struct pipe_rasterizer_state *cso)
{
        struct panfrost_rasterizer *so = CALLOC_STRUCT(panfrost_rasterizer);

        so->base = *cso;

        /* Bitmask, unknown meaning of the start value. 0x105 on 32-bit T6XX */
        so->tiler_gl_enables = 0x7;

        if (cso->front_ccw)
                so->tiler_gl_enables |= MALI_FRONT_CCW_TOP;

        if (cso->cull_face & PIPE_FACE_FRONT)
                so->tiler_gl_enables |= MALI_CULL_FACE_FRONT;

        if (cso->cull_face & PIPE_FACE_BACK)
                so->tiler_gl_enables |= MALI_CULL_FACE_BACK;

        return so;
}

static void
panfrost_bind_rasterizer_state(
        struct pipe_context *pctx,
        void *hwcso)
{
        struct panfrost_context *ctx = pan_context(pctx);

        /* TODO: Why can't rasterizer be NULL ever? Other drivers are fine.. */
        if (!hwcso)
                return;

        ctx->rasterizer = hwcso;

        ctx->fragment_shader_core.depth_units = ctx->rasterizer->base.offset_units * 2.0f;
        ctx->fragment_shader_core.depth_factor = ctx->rasterizer->base.offset_scale;

        /* Gauranteed with the core GL call, so don't expose ARB_polygon_offset */
        assert(ctx->rasterizer->base.offset_clamp == 0.0);

        /* XXX: Which bit is which? Does this maybe allow offseting not-tri? */

        SET_BIT(ctx->fragment_shader_core.unknown2_4, MALI_DEPTH_RANGE_A, ctx->rasterizer->base.offset_tri);
        SET_BIT(ctx->fragment_shader_core.unknown2_4, MALI_DEPTH_RANGE_B, ctx->rasterizer->base.offset_tri);

        /* Point sprites are emulated */

        struct panfrost_shader_state *variant =
                        ctx->shader[PIPE_SHADER_FRAGMENT] ? &ctx->shader[PIPE_SHADER_FRAGMENT]->variants[ctx->shader[PIPE_SHADER_FRAGMENT]->active_variant] : NULL;

        if (ctx->rasterizer->base.sprite_coord_enable || (variant && variant->point_sprite_mask))
                ctx->base.bind_fs_state(&ctx->base, ctx->shader[PIPE_SHADER_FRAGMENT]);
}

static void *
panfrost_create_vertex_elements_state(
        struct pipe_context *pctx,
        unsigned num_elements,
        const struct pipe_vertex_element *elements)
{
        struct panfrost_vertex_state *so = CALLOC_STRUCT(panfrost_vertex_state);

        so->num_elements = num_elements;
        memcpy(so->pipe, elements, sizeof(*elements) * num_elements);

        for (int i = 0; i < num_elements; ++i) {
                so->hw[i].index = i;

                enum pipe_format fmt = elements[i].src_format;
                const struct util_format_description *desc = util_format_description(fmt);
                so->hw[i].unknown1 = 0x2;
                so->hw[i].swizzle = panfrost_get_default_swizzle(desc->nr_channels);

                so->hw[i].format = panfrost_find_format(desc);

                /* The field itself should probably be shifted over */
                so->hw[i].src_offset = elements[i].src_offset;
        }

        return so;
}

static void
panfrost_bind_vertex_elements_state(
        struct pipe_context *pctx,
        void *hwcso)
{
        struct panfrost_context *ctx = pan_context(pctx);
        ctx->vertex = hwcso;
}

static void *
panfrost_create_shader_state(
        struct pipe_context *pctx,
        const struct pipe_shader_state *cso,
        enum pipe_shader_type stage)
{
        struct panfrost_shader_variants *so = CALLOC_STRUCT(panfrost_shader_variants);
        so->base = *cso;

        /* Token deep copy to prevent memory corruption */

        if (cso->type == PIPE_SHADER_IR_TGSI)
                so->base.tokens = tgsi_dup_tokens(so->base.tokens);

        /* Precompile for shader-db if we need to */
        if (unlikely((pan_debug & PAN_DBG_PRECOMPILE) && cso->type == PIPE_SHADER_IR_NIR)) {
                struct panfrost_context *ctx = pan_context(pctx);

                struct mali_shader_meta meta;
                struct panfrost_shader_state state;
                uint64_t outputs_written;

                panfrost_shader_compile(ctx, &meta,
                              PIPE_SHADER_IR_NIR,
                                      so->base.ir.nir,
                                        tgsi_processor_to_shader_stage(stage), &state,
                                        &outputs_written);
        }

        return so;
}

static void
panfrost_delete_shader_state(
        struct pipe_context *pctx,
        void *so)
{
        struct panfrost_shader_variants *cso = (struct panfrost_shader_variants *) so;

        if (cso->base.type == PIPE_SHADER_IR_TGSI) {
                DBG("Deleting TGSI shader leaks duplicated tokens\n");
        }

        for (unsigned i = 0; i < cso->variant_count; ++i) {
                struct panfrost_shader_state *shader_state = &cso->variants[i];
                panfrost_bo_unreference(shader_state->bo);
                shader_state->bo = NULL;
        }
        free(cso->variants);

        free(so);
}

static void *
panfrost_create_sampler_state(
        struct pipe_context *pctx,
        const struct pipe_sampler_state *cso)
{
        struct panfrost_sampler_state *so = CALLOC_STRUCT(panfrost_sampler_state);
        so->base = *cso;

        /* sampler_state corresponds to mali_sampler_descriptor, which we can generate entirely here */

        bool min_nearest = cso->min_img_filter == PIPE_TEX_FILTER_NEAREST;
        bool mag_nearest = cso->mag_img_filter == PIPE_TEX_FILTER_NEAREST;
        bool mip_linear  = cso->min_mip_filter == PIPE_TEX_MIPFILTER_LINEAR;

        unsigned min_filter = min_nearest ? MALI_SAMP_MIN_NEAREST : 0;
        unsigned mag_filter = mag_nearest ? MALI_SAMP_MAG_NEAREST : 0;
        unsigned mip_filter = mip_linear  ?
                (MALI_SAMP_MIP_LINEAR_1 | MALI_SAMP_MIP_LINEAR_2) : 0;
        unsigned normalized = cso->normalized_coords ? MALI_SAMP_NORM_COORDS : 0;

        struct mali_sampler_descriptor sampler_descriptor = {
                .filter_mode = min_filter | mag_filter | mip_filter | normalized,
                .wrap_s = translate_tex_wrap(cso->wrap_s),
                .wrap_t = translate_tex_wrap(cso->wrap_t),
                .wrap_r = translate_tex_wrap(cso->wrap_r),
                .compare_func = panfrost_flip_compare_func(
                                panfrost_translate_compare_func(
                                        cso->compare_func)),
                .border_color = {
                        cso->border_color.f[0],
                        cso->border_color.f[1],
                        cso->border_color.f[2],
                        cso->border_color.f[3]
                },
                .min_lod = FIXED_16(cso->min_lod, false), /* clamp at 0 */
                .max_lod = FIXED_16(cso->max_lod, false),
                .lod_bias = FIXED_16(cso->lod_bias, true), /* can be negative */
                .seamless_cube_map = cso->seamless_cube_map,
        };

        /* If necessary, we disable mipmapping in the sampler descriptor by
         * clamping the LOD as tight as possible (from 0 to epsilon,
         * essentially -- remember these are fixed point numbers, so
         * epsilon=1/256) */

        if (cso->min_mip_filter == PIPE_TEX_MIPFILTER_NONE) {
                sampler_descriptor.max_lod = sampler_descriptor.min_lod;

                /* Enforce that there is something in the middle by adding epsilon*/

                if (sampler_descriptor.min_lod == sampler_descriptor.max_lod)
                        sampler_descriptor.max_lod++;

                /* Sanity check */
                assert(sampler_descriptor.max_lod > sampler_descriptor.min_lod);
        }

        so->hw = sampler_descriptor;

        return so;
}

static void
panfrost_bind_sampler_states(
        struct pipe_context *pctx,
        enum pipe_shader_type shader,
        unsigned start_slot, unsigned num_sampler,
        void **sampler)
{
        assert(start_slot == 0);

        struct panfrost_context *ctx = pan_context(pctx);

        /* XXX: Should upload, not just copy? */
        ctx->sampler_count[shader] = num_sampler;
        memcpy(ctx->samplers[shader], sampler, num_sampler * sizeof (void *));
}

static bool
panfrost_variant_matches(
        struct panfrost_context *ctx,
        struct panfrost_shader_state *variant,
        enum pipe_shader_type type)
{
        struct pipe_rasterizer_state *rasterizer = &ctx->rasterizer->base;
        struct pipe_alpha_state *alpha = &ctx->depth_stencil->alpha;

        bool is_fragment = (type == PIPE_SHADER_FRAGMENT);

        if (is_fragment && (alpha->enabled || variant->alpha_state.enabled)) {
                /* Make sure enable state is at least the same */
                if (alpha->enabled != variant->alpha_state.enabled) {
                        return false;
                }

                /* Check that the contents of the test are the same */
                bool same_func = alpha->func == variant->alpha_state.func;
                bool same_ref = alpha->ref_value == variant->alpha_state.ref_value;

                if (!(same_func && same_ref)) {
                        return false;
                }
        }

        if (is_fragment && rasterizer && (rasterizer->sprite_coord_enable |
                                          variant->point_sprite_mask)) {
                /* Ensure the same varyings are turned to point sprites */
                if (rasterizer->sprite_coord_enable != variant->point_sprite_mask)
                        return false;

                /* Ensure the orientation is correct */
                bool upper_left =
                        rasterizer->sprite_coord_mode ==
                        PIPE_SPRITE_COORD_UPPER_LEFT;

                if (variant->point_sprite_upper_left != upper_left)
                        return false;
        }

        /* Otherwise, we're good to go */
        return true;
}

/**
 * Fix an uncompiled shader's stream output info, and produce a bitmask
 * of which VARYING_SLOT_* are captured for stream output.
 *
 * Core Gallium stores output->register_index as a "slot" number, where
 * slots are assigned consecutively to all outputs in info->outputs_written.
 * This naive packing of outputs doesn't work for us - we too have slots,
 * but the layout is defined by the VUE map, which we won't have until we
 * compile a specific shader variant.  So, we remap these and simply store
 * VARYING_SLOT_* in our copy's output->register_index fields.
 *
 * We then produce a bitmask of outputs which are used for SO.
 *
 * Implementation from iris.
 */

static uint64_t
update_so_info(struct pipe_stream_output_info *so_info,
               uint64_t outputs_written)
{
        uint64_t so_outputs = 0;
        uint8_t reverse_map[64] = {0};
        unsigned slot = 0;

        while (outputs_written)
                reverse_map[slot++] = u_bit_scan64(&outputs_written);

        for (unsigned i = 0; i < so_info->num_outputs; i++) {
                struct pipe_stream_output *output = &so_info->output[i];

                /* Map Gallium's condensed "slots" back to real VARYING_SLOT_* enums */
                output->register_index = reverse_map[output->register_index];

                so_outputs |= 1ull << output->register_index;
        }

        return so_outputs;
}

static void
panfrost_bind_shader_state(
        struct pipe_context *pctx,
        void *hwcso,
        enum pipe_shader_type type)
{
        struct panfrost_context *ctx = pan_context(pctx);
        ctx->shader[type] = hwcso;

        if (!hwcso) return;

        /* Match the appropriate variant */

        signed variant = -1;
        struct panfrost_shader_variants *variants = (struct panfrost_shader_variants *) hwcso;

        for (unsigned i = 0; i < variants->variant_count; ++i) {
                if (panfrost_variant_matches(ctx, &variants->variants[i], type)) {
                        variant = i;
                        break;
                }
        }

        if (variant == -1) {
                /* No variant matched, so create a new one */
                variant = variants->variant_count++;

                if (variants->variant_count > variants->variant_space) {
                        unsigned old_space = variants->variant_space;

                        variants->variant_space *= 2;
                        if (variants->variant_space == 0)
                                variants->variant_space = 1;

                        /* Arbitrary limit to stop runaway programs from
                         * creating an unbounded number of shader variants. */
                        assert(variants->variant_space < 1024);

                        unsigned msize = sizeof(struct panfrost_shader_state);
                        variants->variants = realloc(variants->variants,
                                                     variants->variant_space * msize);

                        memset(&variants->variants[old_space], 0,
                               (variants->variant_space - old_space) * msize);
                }

                struct panfrost_shader_state *v =
                                &variants->variants[variant];

                if (type == PIPE_SHADER_FRAGMENT) {
                        v->alpha_state = ctx->depth_stencil->alpha;

                        if (ctx->rasterizer) {
                                v->point_sprite_mask = ctx->rasterizer->base.sprite_coord_enable;
                                v->point_sprite_upper_left =
                                        ctx->rasterizer->base.sprite_coord_mode ==
                                        PIPE_SPRITE_COORD_UPPER_LEFT;
                        }
                }

                variants->variants[variant].tripipe = calloc(1, sizeof(struct mali_shader_meta));

        }

        /* Select this variant */
        variants->active_variant = variant;

        struct panfrost_shader_state *shader_state = &variants->variants[variant];
        assert(panfrost_variant_matches(ctx, shader_state, type));

        /* We finally have a variant, so compile it */

        if (!shader_state->compiled) {
                uint64_t outputs_written = 0;

                panfrost_shader_compile(ctx, shader_state->tripipe,
                              variants->base.type,
                              variants->base.type == PIPE_SHADER_IR_NIR ?
                                      variants->base.ir.nir :
                                      variants->base.tokens,
                                        tgsi_processor_to_shader_stage(type), shader_state,
                                        &outputs_written);

                shader_state->compiled = true;

                /* Fixup the stream out information, since what Gallium returns
                 * normally is mildly insane */

                shader_state->stream_output = variants->base.stream_output;
                shader_state->so_mask =
                        update_so_info(&shader_state->stream_output, outputs_written);
        }
}

static void *
panfrost_create_vs_state(struct pipe_context *pctx, const struct pipe_shader_state *hwcso)
{
        return panfrost_create_shader_state(pctx, hwcso, PIPE_SHADER_VERTEX);
}

static void *
panfrost_create_fs_state(struct pipe_context *pctx, const struct pipe_shader_state *hwcso)
{
        return panfrost_create_shader_state(pctx, hwcso, PIPE_SHADER_FRAGMENT);
}

static void
panfrost_bind_vs_state(struct pipe_context *pctx, void *hwcso)
{
        panfrost_bind_shader_state(pctx, hwcso, PIPE_SHADER_VERTEX);
}

static void
panfrost_bind_fs_state(struct pipe_context *pctx, void *hwcso)
{
        panfrost_bind_shader_state(pctx, hwcso, PIPE_SHADER_FRAGMENT);
}

static void
panfrost_set_vertex_buffers(
        struct pipe_context *pctx,
        unsigned start_slot,
        unsigned num_buffers,
        const struct pipe_vertex_buffer *buffers)
{
        struct panfrost_context *ctx = pan_context(pctx);

        util_set_vertex_buffers_mask(ctx->vertex_buffers, &ctx->vb_mask, buffers, start_slot, num_buffers);
}

static void
panfrost_set_constant_buffer(
        struct pipe_context *pctx,
        enum pipe_shader_type shader, uint index,
        const struct pipe_constant_buffer *buf)
{
        struct panfrost_context *ctx = pan_context(pctx);
        struct panfrost_constant_buffer *pbuf = &ctx->constant_buffer[shader];

        util_copy_constant_buffer(&pbuf->cb[index], buf);

        unsigned mask = (1 << index);

        if (unlikely(!buf)) {
                pbuf->enabled_mask &= ~mask;
                pbuf->dirty_mask &= ~mask;
                return;
        }

        pbuf->enabled_mask |= mask;
        pbuf->dirty_mask |= mask;
}

static void
panfrost_set_stencil_ref(
        struct pipe_context *pctx,
        const struct pipe_stencil_ref *ref)
{
        struct panfrost_context *ctx = pan_context(pctx);
        ctx->stencil_ref = *ref;
}

static enum mali_texture_type
panfrost_translate_texture_type(enum pipe_texture_target t) {
        switch (t)
        {
        case PIPE_BUFFER:
        case PIPE_TEXTURE_1D:
        case PIPE_TEXTURE_1D_ARRAY:
                return MALI_TEX_1D;

        case PIPE_TEXTURE_2D:
        case PIPE_TEXTURE_2D_ARRAY:
        case PIPE_TEXTURE_RECT:
                return MALI_TEX_2D;

        case PIPE_TEXTURE_3D:
                return MALI_TEX_3D;

        case PIPE_TEXTURE_CUBE:
        case PIPE_TEXTURE_CUBE_ARRAY:
                return MALI_TEX_CUBE;

        default:
                unreachable("Unknown target");
        }
}

static uint8_t
panfrost_compute_astc_stretch(
        const struct util_format_description *desc)
{
        unsigned width = desc->block.width;
        unsigned height = desc->block.height;
        assert(width >= 4 && width <= 12);
        assert(height >= 4 && height <= 12);
        if (width == 12)
                width = 11;
        if (height == 12)
                height = 11;
        return ((height - 4) * 8) + (width - 4);
}

static struct pipe_sampler_view *
panfrost_create_sampler_view(
        struct pipe_context *pctx,
        struct pipe_resource *texture,
        const struct pipe_sampler_view *template)
{
        struct panfrost_sampler_view *so = rzalloc(pctx, struct panfrost_sampler_view);
        int bytes_per_pixel = util_format_get_blocksize(texture->format);

        pipe_reference(NULL, &texture->reference);

        struct panfrost_resource *prsrc = (struct panfrost_resource *) texture;
        assert(prsrc->bo);

        so->base = *template;
        so->base.texture = texture;
        so->base.reference.count = 1;
        so->base.context = pctx;

        /* sampler_views correspond to texture descriptors, minus the texture
         * (data) itself. So, we serialise the descriptor here and cache it for
         * later. */

        const struct util_format_description *desc = util_format_description(prsrc->base.format);

        unsigned char user_swizzle[4] = {
                template->swizzle_r,
                template->swizzle_g,
                template->swizzle_b,
                template->swizzle_a
        };

        enum mali_format format = panfrost_find_format(desc);

        if (format == MALI_ASTC_HDR_SUPP || format == MALI_ASTC_SRGB_SUPP)
                so->astc_stretch = panfrost_compute_astc_stretch(desc);

        /* Check if we need to set a custom stride by computing the "expected"
         * stride and comparing it to what the BO actually wants. Only applies
         * to linear textures, since tiled/compressed textures have strict
         * alignment requirements for their strides as it is */

        unsigned first_level = template->u.tex.first_level;
        unsigned last_level = template->u.tex.last_level;

        if (prsrc->layout == MALI_TEXTURE_LINEAR) {
                for (unsigned l = first_level; l <= last_level; ++l) {
                        unsigned actual_stride = prsrc->slices[l].stride;
                        unsigned width = u_minify(texture->width0, l);
                        unsigned comp_stride = width * bytes_per_pixel;

                        if (comp_stride != actual_stride) {
                                so->manual_stride = true;
                                break;
                        }
                }
        }

        /* In the hardware, array_size refers specifically to array textures,
         * whereas in Gallium, it also covers cubemaps */

        unsigned array_size = texture->array_size;

        if (template->target == PIPE_TEXTURE_CUBE) {
                /* TODO: Cubemap arrays */
                assert(array_size == 6);
                array_size /= 6;
        }

        struct mali_texture_descriptor texture_descriptor = {
                .width = MALI_POSITIVE(u_minify(texture->width0, first_level)),
                .height = MALI_POSITIVE(u_minify(texture->height0, first_level)),
                .depth = MALI_POSITIVE(u_minify(texture->depth0, first_level)),
                .array_size = MALI_POSITIVE(array_size),

                .format = {
                        .swizzle = panfrost_translate_swizzle_4(desc->swizzle),
                        .format = format,
                        .srgb = desc->colorspace == UTIL_FORMAT_COLORSPACE_SRGB,
                        .type = panfrost_translate_texture_type(template->target),
                        .unknown2 = 0x1,
                },

                .swizzle = panfrost_translate_swizzle_4(user_swizzle)
        };

        texture_descriptor.levels = last_level - first_level;

        so->hw = texture_descriptor;

        return (struct pipe_sampler_view *) so;
}

static void
panfrost_set_sampler_views(
        struct pipe_context *pctx,
        enum pipe_shader_type shader,
        unsigned start_slot, unsigned num_views,
        struct pipe_sampler_view **views)
{
        struct panfrost_context *ctx = pan_context(pctx);
        unsigned new_nr = 0;
        unsigned i;

        assert(start_slot == 0);

        for (i = 0; i < num_views; ++i) {
                if (views[i])
                        new_nr = i + 1;
                pipe_sampler_view_reference((struct pipe_sampler_view **)&ctx->sampler_views[shader][i],
                                            views[i]);
        }

        for (; i < ctx->sampler_view_count[shader]; i++) {
                pipe_sampler_view_reference((struct pipe_sampler_view **)&ctx->sampler_views[shader][i],
                                            NULL);
        }
        ctx->sampler_view_count[shader] = new_nr;
}

static void
panfrost_sampler_view_destroy(
        struct pipe_context *pctx,
        struct pipe_sampler_view *view)
{
        pipe_resource_reference(&view->texture, NULL);
        ralloc_free(view);
}

static void
panfrost_set_shader_buffers(
        struct pipe_context *pctx,
        enum pipe_shader_type shader,
        unsigned start, unsigned count,
        const struct pipe_shader_buffer *buffers,
        unsigned writable_bitmask)
{
        struct panfrost_context *ctx = pan_context(pctx);

        util_set_shader_buffers_mask(ctx->ssbo[shader], &ctx->ssbo_mask[shader],
                        buffers, start, count);
}

/* Hints that a framebuffer should use AFBC where possible */

static void
panfrost_hint_afbc(
                struct panfrost_screen *screen,
                const struct pipe_framebuffer_state *fb)
{
        /* AFBC implemenation incomplete; hide it */
        if (!(pan_debug & PAN_DBG_AFBC)) return;

        /* Hint AFBC to the resources bound to each color buffer */

        for (unsigned i = 0; i < fb->nr_cbufs; ++i) {
                struct pipe_surface *surf = fb->cbufs[i];
                struct panfrost_resource *rsrc = pan_resource(surf->texture);
                panfrost_resource_hint_layout(screen, rsrc, MALI_TEXTURE_AFBC, 1);
        }

        /* Also hint it to the depth buffer */

        if (fb->zsbuf) {
                struct panfrost_resource *rsrc = pan_resource(fb->zsbuf->texture);
                panfrost_resource_hint_layout(screen, rsrc, MALI_TEXTURE_AFBC, 1);
        }
}

static void
panfrost_set_framebuffer_state(struct pipe_context *pctx,
                               const struct pipe_framebuffer_state *fb)
{
        struct panfrost_context *ctx = pan_context(pctx);

        panfrost_hint_afbc(pan_screen(pctx->screen), fb);
        util_copy_framebuffer_state(&ctx->pipe_framebuffer, fb);
        ctx->batch = NULL;
        panfrost_invalidate_frame(ctx);
}

static void *
panfrost_create_depth_stencil_state(struct pipe_context *pipe,
                                    const struct pipe_depth_stencil_alpha_state *depth_stencil)
{
        return mem_dup(depth_stencil, sizeof(*depth_stencil));
}

static void
panfrost_bind_depth_stencil_state(struct pipe_context *pipe,
                                  void *cso)
{
        struct panfrost_context *ctx = pan_context(pipe);
        struct pipe_depth_stencil_alpha_state *depth_stencil = cso;
        ctx->depth_stencil = depth_stencil;

        if (!depth_stencil)
                return;

        /* Alpha does not exist in the hardware (it's not in ES3), so it's
         * emulated in the fragment shader */

        if (depth_stencil->alpha.enabled) {
                /* We need to trigger a new shader (maybe) */
                ctx->base.bind_fs_state(&ctx->base, ctx->shader[PIPE_SHADER_FRAGMENT]);
        }

        /* Stencil state */
        SET_BIT(ctx->fragment_shader_core.unknown2_4, MALI_STENCIL_TEST, depth_stencil->stencil[0].enabled);

        panfrost_make_stencil_state(&depth_stencil->stencil[0], &ctx->fragment_shader_core.stencil_front);
        ctx->fragment_shader_core.stencil_mask_front = depth_stencil->stencil[0].writemask;

        /* If back-stencil is not enabled, use the front values */
        bool back_enab = ctx->depth_stencil->stencil[1].enabled;
        unsigned back_index = back_enab ? 1 : 0;

        panfrost_make_stencil_state(&depth_stencil->stencil[back_index], &ctx->fragment_shader_core.stencil_back);
        ctx->fragment_shader_core.stencil_mask_back = depth_stencil->stencil[back_index].writemask;

        /* Depth state (TODO: Refactor) */
        SET_BIT(ctx->fragment_shader_core.unknown2_3, MALI_DEPTH_WRITEMASK,
                depth_stencil->depth.writemask);

        int func = depth_stencil->depth.enabled ? depth_stencil->depth.func : PIPE_FUNC_ALWAYS;

        ctx->fragment_shader_core.unknown2_3 &= ~MALI_DEPTH_FUNC_MASK;
        ctx->fragment_shader_core.unknown2_3 |= MALI_DEPTH_FUNC(panfrost_translate_compare_func(func));

        /* Bounds test not implemented */
        assert(!depth_stencil->depth.bounds_test);
}

static void
panfrost_delete_depth_stencil_state(struct pipe_context *pipe, void *depth)
{
        free( depth );
}

static void
panfrost_set_sample_mask(struct pipe_context *pipe,
                         unsigned sample_mask)
{
}

static void
panfrost_set_clip_state(struct pipe_context *pipe,
                        const struct pipe_clip_state *clip)
{
        //struct panfrost_context *panfrost = pan_context(pipe);
}

static void
panfrost_set_viewport_states(struct pipe_context *pipe,
                             unsigned start_slot,
                             unsigned num_viewports,
                             const struct pipe_viewport_state *viewports)
{
        struct panfrost_context *ctx = pan_context(pipe);

        assert(start_slot == 0);
        assert(num_viewports == 1);

        ctx->pipe_viewport = *viewports;
}

static void
panfrost_set_scissor_states(struct pipe_context *pipe,
                            unsigned start_slot,
                            unsigned num_scissors,
                            const struct pipe_scissor_state *scissors)
{
        struct panfrost_context *ctx = pan_context(pipe);

        assert(start_slot == 0);
        assert(num_scissors == 1);

        ctx->scissor = *scissors;
}

static void
panfrost_set_polygon_stipple(struct pipe_context *pipe,
                             const struct pipe_poly_stipple *stipple)
{
        //struct panfrost_context *panfrost = pan_context(pipe);
}

static void
panfrost_set_active_query_state(struct pipe_context *pipe,
                                bool enable)
{
        struct panfrost_context *ctx = pan_context(pipe);
        ctx->active_queries = enable;
}

static void
panfrost_destroy(struct pipe_context *pipe)
{
        struct panfrost_context *panfrost = pan_context(pipe);

        if (panfrost->blitter)
                util_blitter_destroy(panfrost->blitter);

        if (panfrost->blitter_wallpaper)
                util_blitter_destroy(panfrost->blitter_wallpaper);

        util_unreference_framebuffer_state(&panfrost->pipe_framebuffer);
        u_upload_destroy(pipe->stream_uploader);

        ralloc_free(pipe);
}

static struct pipe_query *
panfrost_create_query(struct pipe_context *pipe,
                      unsigned type,
                      unsigned index)
{
        struct panfrost_query *q = rzalloc(pipe, struct panfrost_query);

        q->type = type;
        q->index = index;

        return (struct pipe_query *) q;
}

static void
panfrost_destroy_query(struct pipe_context *pipe, struct pipe_query *q)
{
        struct panfrost_query *query = (struct panfrost_query *) q;

        if (query->bo) {
                panfrost_bo_unreference(query->bo);
                query->bo = NULL;
        }

        ralloc_free(q);
}

static bool
panfrost_begin_query(struct pipe_context *pipe, struct pipe_query *q)
{
        struct panfrost_context *ctx = pan_context(pipe);
        struct panfrost_query *query = (struct panfrost_query *) q;

        switch (query->type) {
        case PIPE_QUERY_OCCLUSION_COUNTER:
        case PIPE_QUERY_OCCLUSION_PREDICATE:
        case PIPE_QUERY_OCCLUSION_PREDICATE_CONSERVATIVE:
                /* Allocate a bo for the query results to be stored */
                if (!query->bo) {
                        query->bo = panfrost_bo_create(
                                        pan_screen(ctx->base.screen),
                                        sizeof(unsigned), 0);
                }

                unsigned *result = (unsigned *)query->bo->cpu;
                *result = 0; /* Default to 0 if nothing at all drawn. */
                ctx->occlusion_query = query;
                break;

        /* Geometry statistics are computed in the driver. XXX: geom/tess
         * shaders.. */

        case PIPE_QUERY_PRIMITIVES_GENERATED:
                query->start = ctx->prims_generated;
                break;
        case PIPE_QUERY_PRIMITIVES_EMITTED:
                query->start = ctx->tf_prims_generated;
                break;

        default:
                DBG("Skipping query %u\n", query->type);
                break;
        }

        return true;
}

static bool
panfrost_end_query(struct pipe_context *pipe, struct pipe_query *q)
{
        struct panfrost_context *ctx = pan_context(pipe);
        struct panfrost_query *query = (struct panfrost_query *) q;

        switch (query->type) {
        case PIPE_QUERY_OCCLUSION_COUNTER:
        case PIPE_QUERY_OCCLUSION_PREDICATE:
        case PIPE_QUERY_OCCLUSION_PREDICATE_CONSERVATIVE:
                ctx->occlusion_query = NULL;
                break;
        case PIPE_QUERY_PRIMITIVES_GENERATED:
                query->end = ctx->prims_generated;
                break;
        case PIPE_QUERY_PRIMITIVES_EMITTED:
                query->end = ctx->tf_prims_generated;
                break;
        }

        return true;
}

static bool
panfrost_get_query_result(struct pipe_context *pipe,
                          struct pipe_query *q,
                          bool wait,
                          union pipe_query_result *vresult)
{
        struct panfrost_query *query = (struct panfrost_query *) q;
        struct panfrost_context *ctx = pan_context(pipe);


        switch (query->type) {
        case PIPE_QUERY_OCCLUSION_COUNTER:
        case PIPE_QUERY_OCCLUSION_PREDICATE:
        case PIPE_QUERY_OCCLUSION_PREDICATE_CONSERVATIVE:
                /* Flush first */
                panfrost_flush_all_batches(ctx, true);

                /* Read back the query results */
                unsigned *result = (unsigned *) query->bo->cpu;
                unsigned passed = *result;

                if (query->type == PIPE_QUERY_OCCLUSION_COUNTER) {
                        vresult->u64 = passed;
                } else {
                        vresult->b = !!passed;
                }

                break;

        case PIPE_QUERY_PRIMITIVES_GENERATED:
        case PIPE_QUERY_PRIMITIVES_EMITTED:
                panfrost_flush_all_batches(ctx, true);
                vresult->u64 = query->end - query->start;
                break;

        default:
                DBG("Skipped query get %u\n", query->type);
                break;
        }

        return true;
}

static struct pipe_stream_output_target *
panfrost_create_stream_output_target(struct pipe_context *pctx,
                                     struct pipe_resource *prsc,
                                     unsigned buffer_offset,
                                     unsigned buffer_size)
{
        struct pipe_stream_output_target *target;

        target = rzalloc(pctx, struct pipe_stream_output_target);

        if (!target)
                return NULL;

        pipe_reference_init(&target->reference, 1);
        pipe_resource_reference(&target->buffer, prsc);

        target->context = pctx;
        target->buffer_offset = buffer_offset;
        target->buffer_size = buffer_size;

        return target;
}

static void
panfrost_stream_output_target_destroy(struct pipe_context *pctx,
                                      struct pipe_stream_output_target *target)
{
        pipe_resource_reference(&target->buffer, NULL);
        ralloc_free(target);
}

static void
panfrost_set_stream_output_targets(struct pipe_context *pctx,
                                   unsigned num_targets,
                                   struct pipe_stream_output_target **targets,
                                   const unsigned *offsets)
{
        struct panfrost_context *ctx = pan_context(pctx);
        struct panfrost_streamout *so = &ctx->streamout;

        assert(num_targets <= ARRAY_SIZE(so->targets));

        for (unsigned i = 0; i < num_targets; i++) {
                if (offsets[i] != -1)
                        so->offsets[i] = offsets[i];

                pipe_so_target_reference(&so->targets[i], targets[i]);
        }

        for (unsigned i = 0; i < so->num_targets; i++)
                pipe_so_target_reference(&so->targets[i], NULL);

        so->num_targets = num_targets;
}

struct pipe_context *
panfrost_create_context(struct pipe_screen *screen, void *priv, unsigned flags)
{
        struct panfrost_context *ctx = rzalloc(screen, struct panfrost_context);
        struct pipe_context *gallium = (struct pipe_context *) ctx;

        gallium->screen = screen;

        gallium->destroy = panfrost_destroy;

        gallium->set_framebuffer_state = panfrost_set_framebuffer_state;

        gallium->flush = panfrost_flush;
        gallium->clear = panfrost_clear;
        gallium->draw_vbo = panfrost_draw_vbo;

        gallium->set_vertex_buffers = panfrost_set_vertex_buffers;
        gallium->set_constant_buffer = panfrost_set_constant_buffer;
        gallium->set_shader_buffers = panfrost_set_shader_buffers;

        gallium->set_stencil_ref = panfrost_set_stencil_ref;

        gallium->create_sampler_view = panfrost_create_sampler_view;
        gallium->set_sampler_views = panfrost_set_sampler_views;
        gallium->sampler_view_destroy = panfrost_sampler_view_destroy;

        gallium->create_rasterizer_state = panfrost_create_rasterizer_state;
        gallium->bind_rasterizer_state = panfrost_bind_rasterizer_state;
        gallium->delete_rasterizer_state = panfrost_generic_cso_delete;

        gallium->create_vertex_elements_state = panfrost_create_vertex_elements_state;
        gallium->bind_vertex_elements_state = panfrost_bind_vertex_elements_state;
        gallium->delete_vertex_elements_state = panfrost_generic_cso_delete;

        gallium->create_fs_state = panfrost_create_fs_state;
        gallium->delete_fs_state = panfrost_delete_shader_state;
        gallium->bind_fs_state = panfrost_bind_fs_state;

        gallium->create_vs_state = panfrost_create_vs_state;
        gallium->delete_vs_state = panfrost_delete_shader_state;
        gallium->bind_vs_state = panfrost_bind_vs_state;

        gallium->create_sampler_state = panfrost_create_sampler_state;
        gallium->delete_sampler_state = panfrost_generic_cso_delete;
        gallium->bind_sampler_states = panfrost_bind_sampler_states;

        gallium->create_depth_stencil_alpha_state = panfrost_create_depth_stencil_state;
        gallium->bind_depth_stencil_alpha_state   = panfrost_bind_depth_stencil_state;
        gallium->delete_depth_stencil_alpha_state = panfrost_delete_depth_stencil_state;

        gallium->set_sample_mask = panfrost_set_sample_mask;

        gallium->set_clip_state = panfrost_set_clip_state;
        gallium->set_viewport_states = panfrost_set_viewport_states;
        gallium->set_scissor_states = panfrost_set_scissor_states;
        gallium->set_polygon_stipple = panfrost_set_polygon_stipple;
        gallium->set_active_query_state = panfrost_set_active_query_state;

        gallium->create_query = panfrost_create_query;
        gallium->destroy_query = panfrost_destroy_query;
        gallium->begin_query = panfrost_begin_query;
        gallium->end_query = panfrost_end_query;
        gallium->get_query_result = panfrost_get_query_result;

        gallium->create_stream_output_target = panfrost_create_stream_output_target;
        gallium->stream_output_target_destroy = panfrost_stream_output_target_destroy;
        gallium->set_stream_output_targets = panfrost_set_stream_output_targets;

        panfrost_resource_context_init(gallium);
        panfrost_blend_context_init(gallium);
        panfrost_compute_context_init(gallium);

        /* XXX: leaks */
        gallium->stream_uploader = u_upload_create_default(gallium);
        gallium->const_uploader = gallium->stream_uploader;
        assert(gallium->stream_uploader);

        /* Midgard supports ES modes, plus QUADS/QUAD_STRIPS/POLYGON */
        ctx->draw_modes = (1 << (PIPE_PRIM_POLYGON + 1)) - 1;

        ctx->primconvert = util_primconvert_create(gallium, ctx->draw_modes);

        ctx->blitter = util_blitter_create(gallium);
        ctx->blitter_wallpaper = util_blitter_create(gallium);

        assert(ctx->blitter);
        assert(ctx->blitter_wallpaper);

        /* Prepare for render! */

        panfrost_batch_init(ctx);
        panfrost_emit_vertex_payload(ctx);
        panfrost_invalidate_frame(ctx);
        panfrost_default_shader_backend(ctx);

        return gallium;
}