src/gallium/drivers/panfrost/pan_assemble.c

   1 /*
   2  * © Copyright 2018 Alyssa Rosenzweig
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice (including the next
  12  * paragraph) shall be included in all copies or substantial portions of the
  13  * Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  20  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  21  * SOFTWARE.
  22  *
  23  */
  24
  25 #include <stdio.h>
  26 #include <stdlib.h>
  27 #include <string.h>
  28 #include "pan_context.h"
  29
  30 #include "compiler/nir/nir.h"
  31 #include "nir/tgsi_to_nir.h"
  32 #include "midgard/midgard_compile.h"
  33 #include "util/u_dynarray.h"
  34
  35 #include "tgsi/tgsi_dump.h"
  36
  37 void
  38 panfrost_shader_compile(struct panfrost_context *ctx, struct mali_shader_meta *meta, const char *src, int type, struct panfrost_shader_state *state)
  39 {
  40         uint8_t *dst;
  41
  42         nir_shader *s;
  43
  44         struct pipe_shader_state *cso = state->base;
  45
  46         if (cso->type == PIPE_SHADER_IR_NIR) {
  47                 s = nir_shader_clone(NULL, cso->ir.nir);
  48         } else {
  49                 assert (cso->type == PIPE_SHADER_IR_TGSI);
  50                 //tgsi_dump(cso->tokens, 0);
  51                 s = tgsi_to_nir(cso->tokens, ctx->base.screen);
  52         }
  53
  54         s->info.stage = type == JOB_TYPE_VERTEX ? MESA_SHADER_VERTEX : MESA_SHADER_FRAGMENT;
  55
  56         if (s->info.stage == MESA_SHADER_FRAGMENT) {
  57                 /* Inject the alpha test now if we need to */
  58
  59                 if (state->alpha_state.enabled) {
  60                         NIR_PASS_V(s, nir_lower_alpha_test, state->alpha_state.func, false);
  61                 }
  62         }
  63
  64         /* Call out to Midgard compiler given the above NIR */
  65
  66         midgard_program program = {
  67                 .alpha_ref = state->alpha_state.ref_value
  68         };
  69
  70         midgard_compile_shader_nir(&ctx->compiler, s, &program, false);
  71
  72         /* Prepare the compiled binary for upload */
  73         int size = program.compiled.size;
  74         dst = program.compiled.data;
  75
  76         /* Upload the shader. The lookahead tag is ORed on as a tagged pointer.
  77          * I bet someone just thought that would be a cute pun. At least,
  78          * that's how I'd do it. */
  79
  80         meta->shader = panfrost_upload(&ctx->shaders, dst, size) | program.first_tag;
  81
  82         util_dynarray_fini(&program.compiled);
  83
  84         /* Sysvals are prepended */
  85         program.uniform_count += program.sysval_count;
  86         state->sysval_count = program.sysval_count;
  87         memcpy(state->sysval, program.sysvals, sizeof(state->sysval[0]) * state->sysval_count);
  88
  89         meta->midgard1.uniform_count = MIN2(program.uniform_count, program.uniform_cutoff);
  90         meta->midgard1.work_count = program.work_register_count;
  91
  92         switch (s->info.stage) {
  93         case MESA_SHADER_VERTEX:
  94                 meta->attribute_count = util_bitcount64(s->info.inputs_read);
  95                 meta->varying_count = util_bitcount64(s->info.outputs_written);
  96                 break;
  97         case MESA_SHADER_FRAGMENT:
  98                 meta->attribute_count = 0;
  99                 meta->varying_count = util_bitcount64(s->info.inputs_read);
 100                 break;
 101         default:
 102                 unreachable("Unknown shader state");
 103         }
 104
 105         state->can_discard = s->info.fs.uses_discard;
 106         state->writes_point_size = s->info.outputs_written & VARYING_SLOT_PSIZ;
 107         state->reads_point_coord = s->info.inputs_read & VARYING_SLOT_PNTC;
 108         state->helper_invocations = s->info.fs.needs_helper_invocations;
 109
 110         /* Separate as primary uniform count is truncated */
 111         state->uniform_count = program.uniform_count;
 112
 113         meta->midgard1.unknown2 = 8; /* XXX */
 114
 115         unsigned default_vec1_swizzle = panfrost_get_default_swizzle(1);
 116         unsigned default_vec2_swizzle = panfrost_get_default_swizzle(2);
 117         unsigned default_vec4_swizzle = panfrost_get_default_swizzle(4);
 118
 119         /* Iterate the varyings and emit the corresponding descriptor */
 120         for (unsigned i = 0; i < meta->varying_count; ++i) {
 121                 unsigned location = program.varyings[i];
 122
 123                 /* Default to a vec4 varying */
 124                 struct mali_attr_meta v = {
 125                         .format = MALI_RGBA32F,
 126                         .swizzle = default_vec4_swizzle,
 127                         .unknown1 = 0x2,
 128                 };
 129
 130                 /* Check for special cases, otherwise assume general varying */
 131
 132                 if (location == VARYING_SLOT_POS) {
 133                         v.index = 1;
 134                         v.format = MALI_VARYING_POS;
 135                 } else if (location == VARYING_SLOT_PSIZ) {
 136                         v.index = 2;
 137                         v.format = MALI_R16F;
 138                         v.swizzle = default_vec1_swizzle;
 139                 } else if (location == VARYING_SLOT_PNTC) {
 140                         v.index = 3;
 141                         v.format = MALI_RG16F;
 142                         v.swizzle = default_vec2_swizzle;
 143                 } else {
 144                         v.index = 0;
 145                 }
 146
 147                 state->varyings[i] = v;
 148                 state->varyings_loc[i] = location;
 149         }
 150 }