--- /dev/null
+/*
+ * Copyright © 2014 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.
+ */
+
+/**
+ * @file brw_meta_stencil_blit.c
+ *
+ * Implements upsampling, downsampling and scaling of stencil miptrees. The
+ * logic can be originally found in brw_blorp_blit.c.
+ * Implementation creates a temporary draw framebuffer object and attaches the
+ * destination stencil buffer attachment as color attachment. Source attachment
+ * is in turn treated as a stencil texture and the glsl program used for the
+ * blitting samples it using stencil-indexing.
+ *
+ * Unfortunately as the data port does not support interleaved msaa-surfaces
+ * (stencil is always IMS), the glsl program needs to handle the writing of
+ * individual samples manually. Surface is configured as if it were single
+ * sampled (with adjusted dimensions) and the glsl program extracts the
+ * sample indices from the input coordinates for correct texturing.
+ *
+ * Target surface is also configured as Y-tiled instead of W-tiled in order
+ * to support generations 6-7. Later hardware supports W-tiled as render target
+ * and the logic here could be simplified for those.
+ */
+
+#include "brw_context.h"
+#include "intel_batchbuffer.h"
+#include "intel_fbo.h"
+
+#include "main/blit.h"
+#include "main/buffers.h"
+#include "main/fbobject.h"
+#include "main/uniforms.h"
+#include "main/texparam.h"
+#include "main/texobj.h"
+#include "main/viewport.h"
+#include "main/enable.h"
+#include "main/blend.h"
+#include "main/varray.h"
+#include "main/shaderapi.h"
+#include "glsl/ralloc.h"
+
+#include "drivers/common/meta.h"
+#include "brw_meta_util.h"
+
+#define FILE_DEBUG_FLAG DEBUG_FBO
+
+struct blit_dims {
+ int src_x0, src_y0, src_x1, src_y1;
+ int dst_x0, dst_y0, dst_x1, dst_y1;
+ bool mirror_x, mirror_y;
+};
+
+static const char *vs_source =
+ "#version 130\n"
+ "in vec2 position;\n"
+ "out vec2 tex_coords;\n"
+ "void main()\n"
+ "{\n"
+ " tex_coords = (position + 1.0) / 2.0;\n"
+ " gl_Position = vec4(position, 0.0, 1.0);\n"
+ "}\n";
+
+static const struct sampler_and_fetch {
+ const char *sampler;
+ const char *fetch;
+} samplers[] = {
+ { "uniform usampler2D texSampler;\n",
+ " out_color = texelFetch(texSampler, txl_coords, 0)" },
+ { "#extension GL_ARB_texture_multisample : enable\n"
+ "uniform usampler2DMS texSampler;\n",
+ " out_color = texelFetch(texSampler, txl_coords, sample_index)" }
+};
+
+/**
+ * Translating Y-tiled to W-tiled:
+ *
+ * X' = (X & ~0b1011) >> 1 | (Y & 0b1) << 2 | X & 0b1
+ * Y' = (Y & ~0b1) << 1 | (X & 0b1000) >> 2 | (X & 0b10) >> 1
+ */
+static const char *fs_tmpl =
+ "#version 130\n"
+ "%s"
+ "uniform float src_x_scale;\n"
+ "uniform float src_y_scale;\n"
+ "uniform float src_x_off;\n" /* Top right coordinates of the source */
+ "uniform float src_y_off;\n" /* rectangle in W-tiled space. */
+ "uniform float dst_x_off;\n" /* Top right coordinates of the target */
+ "uniform float dst_y_off;\n" /* rectangle in Y-tiled space. */
+ "uniform float draw_rect_w;\n" /* This is the unnormalized size of the */
+ "uniform float draw_rect_h;\n" /* drawing rectangle in Y-tiled space. */
+ "uniform int dst_x0;\n" /* This is the bounding rectangle in the W-tiled */
+ "uniform int dst_x1;\n" /* space that will be used to skip pixels lying */
+ "uniform int dst_y0;\n" /* outside. In some cases the Y-tiled rectangle */
+ "uniform int dst_y1;\n" /* is larger. */
+ "uniform int dst_num_samples;\n"
+ "in vec2 tex_coords;\n"
+ "ivec2 txl_coords;\n"
+ "int sample_index;\n"
+ "out uvec4 out_color;\n"
+ "\n"
+ "void get_unorm_target_coords()\n"
+ "{\n"
+ " txl_coords.x = int(tex_coords.x * draw_rect_w + dst_x_off);\n"
+ " txl_coords.y = int(tex_coords.y * draw_rect_h + dst_y_off);\n"
+ "}\n"
+ "\n"
+ "void translate_dst_to_src()\n"
+ "{\n"
+ " txl_coords.x = int(float(txl_coords.x) * src_x_scale + src_x_off);\n"
+ " txl_coords.y = int(float(txl_coords.y) * src_y_scale + src_y_off);\n"
+ "}\n"
+ "\n"
+ "void translate_y_to_w_tiling()\n"
+ "{\n"
+ " int X = txl_coords.x;\n"
+ " int Y = txl_coords.y;\n"
+ " txl_coords.x = (X & int(0xfff4)) >> 1;\n"
+ " txl_coords.x |= ((Y & int(0x1)) << 2);\n"
+ " txl_coords.x |= (X & int(0x1));\n"
+ " txl_coords.y = (Y & int(0xfffe)) << 1;\n"
+ " txl_coords.y |= ((X & int(0x8)) >> 2);\n"
+ " txl_coords.y |= ((X & int(0x2)) >> 1);\n"
+ "}\n"
+ "\n"
+ "void decode_msaa()\n"
+ "{\n"
+ " int X = txl_coords.x;\n"
+ " int Y = txl_coords.y;\n"
+ " switch (dst_num_samples) {\n"
+ " case 0:\n"
+ " sample_index = 0;\n"
+ " break;\n"
+ " case 2:\n"
+ " txl_coords.x = ((X & int(0xfffc)) >> 1) | (X & int(0x1));\n"
+ " sample_index = (X & 0x2) >> 1;\n"
+ " break;\n"
+ " case 4:\n"
+ " txl_coords.x = ((X & int(0xfffc)) >> 1) | (X & int(0x1));\n"
+ " txl_coords.y = ((Y & int(0xfffc)) >> 1) | (Y & int(0x1));\n"
+ " sample_index = (Y & 0x2) | ((X & 0x2) >> 1);\n"
+ " break;\n"
+ " case 8:\n"
+ " txl_coords.x = ((X & int(0xfff8)) >> 2) | (X & int(0x1));\n"
+ " txl_coords.y = ((Y & int(0xfffc)) >> 1) | (Y & int(0x1));\n"
+ " sample_index = (X & 0x4) | (Y & 0x2) | ((X & 0x2) >> 1);\n"
+ " }\n"
+ "}\n"
+ "\n"
+ "void discard_outside_bounding_rect()\n"
+ "{\n"
+ " int X = txl_coords.x;\n"
+ " int Y = txl_coords.y;\n"
+ " if (X >= dst_x1 || X < dst_x0 || Y >= dst_y1 || Y < dst_y0)\n"
+ " discard;\n"
+ "}\n"
+ "\n"
+ "void main()\n"
+ "{\n"
+ " get_unorm_target_coords();\n"
+ " translate_y_to_w_tiling();\n"
+ " decode_msaa();"
+ " discard_outside_bounding_rect();\n"
+ " translate_dst_to_src();\n"
+ " %s;\n"
+ "}\n";
+
+/**
+ * Setup uniforms telling the coordinates of the destination rectangle in the
+ * native w-tiled space. These are needed to ignore pixels that lie outside.
+ * The destination is drawn as Y-tiled and in some cases the Y-tiled drawing
+ * rectangle is larger than the original (for example 1x4 w-tiled requires
+ * 16x2 y-tiled).
+ */
+static void
+setup_bounding_rect(GLuint prog, const struct blit_dims *dims)
+{
+ _mesa_Uniform1i(_mesa_GetUniformLocation(prog, "dst_x0"), dims->dst_x0);
+ _mesa_Uniform1i(_mesa_GetUniformLocation(prog, "dst_x1"), dims->dst_x1);
+ _mesa_Uniform1i(_mesa_GetUniformLocation(prog, "dst_y0"), dims->dst_y0);
+ _mesa_Uniform1i(_mesa_GetUniformLocation(prog, "dst_y1"), dims->dst_y1);
+}
+
+/**
+ * Setup uniforms telling the destination width, height and the offset. These
+ * are needed to unnoormalize the input coordinates and to correctly translate
+ * between destination and source that may have differing offsets.
+ */
+static void
+setup_drawing_rect(GLuint prog, const struct blit_dims *dims)
+{
+ _mesa_Uniform1f(_mesa_GetUniformLocation(prog, "draw_rect_w"),
+ dims->dst_x1 - dims->dst_x0);
+ _mesa_Uniform1f(_mesa_GetUniformLocation(prog, "draw_rect_h"),
+ dims->dst_y1 - dims->dst_y0);
+ _mesa_Uniform1f(_mesa_GetUniformLocation(prog, "dst_x_off"), dims->dst_x0);
+ _mesa_Uniform1f(_mesa_GetUniformLocation(prog, "dst_y_off"), dims->dst_y0);
+}
+
+/**
+ * When not mirroring a coordinate (say, X), we need:
+ * src_x - src_x0 = (dst_x - dst_x0 + 0.5) * scale
+ * Therefore:
+ * src_x = src_x0 + (dst_x - dst_x0 + 0.5) * scale
+ *
+ * The program uses "round toward zero" to convert the transformed floating
+ * point coordinates to integer coordinates, whereas the behaviour we actually
+ * want is "round to nearest", so 0.5 provides the necessary correction.
+ *
+ * When mirroring X we need:
+ * src_x - src_x0 = dst_x1 - dst_x - 0.5
+ * Therefore:
+ * src_x = src_x0 + (dst_x1 -dst_x - 0.5) * scale
+ */
+static void
+setup_coord_coeff(GLuint prog, GLuint multiplier, GLuint offset,
+ int src_0, int src_1, int dst_0, int dst_1, bool mirror)
+{
+ const float scale = ((float)(src_1 - src_0)) / (dst_1 - dst_0);
+
+ if (mirror) {
+ _mesa_Uniform1f(multiplier, -scale);
+ _mesa_Uniform1f(offset, src_0 + (dst_1 - 0.5) * scale);
+ } else {
+ _mesa_Uniform1f(multiplier, scale);
+ _mesa_Uniform1f(offset, src_0 + (-dst_0 + 0.5) * scale);
+ }
+}
+
+/**
+ * Setup uniforms providing relation between source and destination surfaces.
+ * Destination coordinates are in Y-tiling layout while texelFetch() expects
+ * W-tiled coordinates. Once the destination coordinates are re-interpreted by
+ * the program into the original W-tiled layout, the program needs to know the
+ * offset and scaling factors between the destination and source.
+ * Note that these are calculated in the original W-tiled space before the
+ * destination rectangle is adjusted for possible msaa and Y-tiling.
+ */
+static void
+setup_coord_transform(GLuint prog, const struct blit_dims *dims)
+{
+ setup_coord_coeff(prog,
+ _mesa_GetUniformLocation(prog, "src_x_scale"),
+ _mesa_GetUniformLocation(prog, "src_x_off"),
+ dims->src_x0, dims->src_x1, dims->dst_x0, dims->dst_x1,
+ dims->mirror_x);
+
+ setup_coord_coeff(prog,
+ _mesa_GetUniformLocation(prog, "src_y_scale"),
+ _mesa_GetUniformLocation(prog, "src_y_off"),
+ dims->src_y0, dims->src_y1, dims->dst_y0, dims->dst_y1,
+ dims->mirror_y);
+}
+
+static GLuint
+setup_program(struct gl_context *ctx, bool msaa_tex)
+{
+ struct blit_state *blit = &ctx->Meta->Blit;
+ static GLuint prog_cache[] = { 0, 0 };
+ const char *fs_source;
+ const struct sampler_and_fetch *sampler = &samplers[msaa_tex];
+
+ _mesa_meta_setup_vertex_objects(&blit->VAO, &blit->VBO, true, 2, 2, 0);
+
+ if (prog_cache[msaa_tex]) {
+ _mesa_UseProgram(prog_cache[msaa_tex]);
+ return prog_cache[msaa_tex];
+ }
+
+ fs_source = ralloc_asprintf(NULL, fs_tmpl, sampler->sampler,
+ sampler->fetch);
+ _mesa_meta_compile_and_link_program(ctx, vs_source, fs_source,
+ "i965 stencil blit",
+ &prog_cache[msaa_tex]);
+ ralloc_free(fs_source);
+
+ return prog_cache[msaa_tex];
+}
+
+/**
+ * Samples in stencil buffer are interleaved, and unfortunately the data port
+ * does not support it as render target. Therefore the surface is set up as
+ * single sampled and the program handles the interleaving.
+ * In case of single sampled stencil, the render buffer is adjusted with
+ * twice the base level height in order for the program to be able to write
+ * any mip-level. (Used to set the drawing rectangle for the hw).
+ */
+static void
+adjust_msaa(struct blit_dims *dims, int num_samples)
+{
+ if (num_samples == 2) {
+ dims->dst_x0 *= 2;
+ dims->dst_x1 *= 2;
+ } else if (num_samples) {
+ const int x_num_samples = num_samples / 2;
+ dims->dst_x0 = ROUND_DOWN_TO(dims->dst_x0 * x_num_samples, num_samples);
+ dims->dst_y0 = ROUND_DOWN_TO(dims->dst_y0 * 2, 4);
+ dims->dst_x1 = ALIGN(dims->dst_x1 * x_num_samples, num_samples);
+ dims->dst_y1 = ALIGN(dims->dst_y1 * 2, 4);
+ }
+}
+
+/**
+ * Stencil is mapped as Y-tiled render target and the dimensions need to be
+ * adjusted in order for the Y-tiled rectangle to cover the entire linear
+ * memory space of the original W-tiled rectangle.
+ */
+static void
+adjust_tiling(struct blit_dims *dims, int num_samples)
+{
+ const unsigned x_align = 8, y_align = num_samples > 2 ? 8 : 4;
+
+ dims->dst_x0 = ROUND_DOWN_TO(dims->dst_x0, x_align) * 2;
+ dims->dst_y0 = ROUND_DOWN_TO(dims->dst_y0, y_align) / 2;
+ dims->dst_x1 = ALIGN(dims->dst_x1, x_align) * 2;
+ dims->dst_y1 = ALIGN(dims->dst_y1, y_align) / 2;
+}
+
+/**
+ * When stencil is mapped as Y-tiled render target the mip-level offsets
+ * calculated for the Y-tiling do not always match the offsets in W-tiling.
+ * Therefore the sampling engine cannot be used for individual mip-level
+ * access but the program needs to do it internally. This can be achieved
+ * by shifting the coordinates of the blit rectangle here.
+ */
+static void
+adjust_mip_level(const struct intel_mipmap_tree *mt,
+ unsigned level, unsigned layer, struct blit_dims *dims)
+{
+ unsigned x_offset;
+ unsigned y_offset;
+
+ intel_miptree_get_image_offset(mt, level, layer, &x_offset, &y_offset);
+
+ dims->dst_x0 += x_offset;
+ dims->dst_y0 += y_offset;
+ dims->dst_x1 += x_offset;
+ dims->dst_y1 += y_offset;
+}
+
+static void
+prepare_vertex_data(void)
+{
+ static const struct vertex verts[] = {
+ { .x = -1.0f, .y = -1.0f },
+ { .x = 1.0f, .y = -1.0f },
+ { .x = 1.0f, .y = 1.0f },
+ { .x = -1.0f, .y = 1.0f } };
+
+ _mesa_BufferSubData(GL_ARRAY_BUFFER_ARB, 0, sizeof(verts), verts);
+}
+
+static void
+set_read_rb_tex_image(struct gl_context *ctx, struct fb_tex_blit_state *blit,
+ GLenum *target)
+{
+ const struct gl_renderbuffer_attachment *att =
+ &ctx->ReadBuffer->Attachment[BUFFER_STENCIL];
+ struct gl_renderbuffer *rb = att->Renderbuffer;
+ struct gl_texture_object *tex_obj;
+ unsigned level = 0;
+
+ /* If the renderbuffer is already backed by an tex image, use it. */
+ if (att->Texture) {
+ tex_obj = att->Texture;
+ *target = tex_obj->Target;
+ level = att->TextureLevel;
+ } else {
+ _mesa_meta_bind_rb_as_tex_image(ctx, rb, &blit->tempTex, &tex_obj,
+ target);
+ }
+
+ blit->baseLevelSave = tex_obj->BaseLevel;
+ blit->maxLevelSave = tex_obj->MaxLevel;
+ blit->sampler = _mesa_meta_setup_sampler(ctx, tex_obj, *target,
+ GL_NEAREST, level);
+}
+
+static void
+brw_meta_stencil_blit(struct brw_context *brw,
+ struct intel_mipmap_tree *dst_mt,
+ unsigned dst_level, unsigned dst_layer,
+ const struct blit_dims *orig_dims)
+{
+ struct gl_context *ctx = &brw->ctx;
+ struct blit_dims dims = *orig_dims;
+ struct fb_tex_blit_state blit;
+ GLuint prog, fbo, rbo;
+ GLenum target;
+
+ _mesa_meta_fb_tex_blit_begin(ctx, &blit);
+
+ _mesa_GenFramebuffers(1, &fbo);
+ /* Force the surface to be configured for level zero. */
+ rbo = brw_get_rb_for_slice(brw, dst_mt, 0, dst_layer, true);
+ adjust_msaa(&dims, dst_mt->num_samples);
+ adjust_tiling(&dims, dst_mt->num_samples);
+
+ _mesa_BindFramebuffer(GL_DRAW_FRAMEBUFFER, fbo);
+ _mesa_FramebufferRenderbuffer(GL_DRAW_FRAMEBUFFER, GL_COLOR_ATTACHMENT0,
+ GL_RENDERBUFFER, rbo);
+ _mesa_DrawBuffer(GL_COLOR_ATTACHMENT0);
+ ctx->DrawBuffer->_Status = GL_FRAMEBUFFER_COMPLETE;
+
+ set_read_rb_tex_image(ctx, &blit, &target);
+
+ _mesa_TexParameteri(target, GL_DEPTH_STENCIL_TEXTURE_MODE,
+ GL_STENCIL_INDEX);
+
+ prog = setup_program(ctx, target != GL_TEXTURE_2D);
+ setup_bounding_rect(prog, orig_dims);
+ setup_drawing_rect(prog, &dims);
+ setup_coord_transform(prog, orig_dims);
+
+ _mesa_Uniform1i(_mesa_GetUniformLocation(prog, "dst_num_samples"),
+ dst_mt->num_samples);
+
+ prepare_vertex_data();
+ _mesa_set_viewport(ctx, 0, dims.dst_x0, dims.dst_y0,
+ dims.dst_x1 - dims.dst_x0, dims.dst_y1 - dims.dst_y0);
+ _mesa_ColorMask(GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE);
+ _mesa_set_enable(ctx, GL_DEPTH_TEST, false);
+
+ _mesa_DrawArrays(GL_TRIANGLE_FAN, 0, 4);
+
+ _mesa_meta_fb_tex_blit_end(ctx, target, &blit);
+ _mesa_meta_end(ctx);
+
+ _mesa_DeleteRenderbuffers(1, &rbo);
+ _mesa_DeleteFramebuffers(1, &fbo);
+}
+
+void
+brw_meta_fbo_stencil_blit(struct brw_context *brw,
+ GLfloat src_x0, GLfloat src_y0,
+ GLfloat src_x1, GLfloat src_y1,
+ GLfloat dst_x0, GLfloat dst_y0,
+ GLfloat dst_x1, GLfloat dst_y1)
+{
+ struct gl_context *ctx = &brw->ctx;
+ struct gl_renderbuffer *draw_fb =
+ ctx->DrawBuffer->Attachment[BUFFER_STENCIL].Renderbuffer;
+ const struct intel_renderbuffer *dst_irb = intel_renderbuffer(draw_fb);
+ struct intel_mipmap_tree *dst_mt = dst_irb->mt;
+
+ if (!dst_mt)
+ return;
+
+ if (dst_mt->stencil_mt)
+ dst_mt = dst_mt->stencil_mt;
+
+ bool mirror_x, mirror_y;
+ if (brw_meta_mirror_clip_and_scissor(ctx,
+ &src_x0, &src_y0, &src_x1, &src_y1,
+ &dst_x0, &dst_y0, &dst_x1, &dst_y1,
+ &mirror_x, &mirror_y))
+ return;
+
+ struct blit_dims dims = { .src_x0 = src_x0, .src_y0 = src_y0,
+ .src_x1 = src_x1, .src_y1 = src_y1,
+ .dst_x0 = dst_x0, .dst_y0 = dst_y0,
+ .dst_x1 = dst_x1, .dst_y1 = dst_y1,
+ .mirror_x = mirror_x, .mirror_y = mirror_y };
+ adjust_mip_level(dst_mt, dst_irb->mt_level, dst_irb->mt_layer, &dims);
+
+ intel_batchbuffer_emit_mi_flush(brw);
+ _mesa_meta_begin(ctx, MESA_META_ALL);
+ brw_meta_stencil_blit(brw,
+ dst_mt, dst_irb->mt_level, dst_irb->mt_layer, &dims);
+ intel_batchbuffer_emit_mi_flush(brw);
+}
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