[Mesa-dev] [PATCH 3/3] i965: Add i965 plumbing for ARB_post_depth_coverage for i965 (gen9+).

[Plamena Manolova]

This extension allows the fragment shader to control whether values in
gl_SampleMaskIn[] reflect the coverage after application of the early
depth and stencil tests.

Signed-off-by: Plamena Manolova <plamena.manolova at intel.com>
---
 src/mesa/drivers/dri/i965/brw_compiler.h     |  1 +
 src/mesa/drivers/dri/i965/brw_fs.cpp         |  1 +
 src/mesa/drivers/dri/i965/gen8_ps_state.c    | 13 ++++++++++---
 src/mesa/drivers/dri/i965/intel_extensions.c |  1 +
 4 files changed, 13 insertions(+), 3 deletions(-)

diff --git a/src/mesa/drivers/dri/i965/brw_compiler.h b/src/mesa/drivers/dri/i965/brw_compiler.h
index c2400f9..d97d466 100644
--- a/src/mesa/drivers/dri/i965/brw_compiler.h
+++ b/src/mesa/drivers/dri/i965/brw_compiler.h
@@ -397,6 +397,7 @@ struct brw_wm_prog_data {
    bool computed_stencil;
 
    bool early_fragment_tests;
+   bool post_depth_coverage;
    bool dispatch_8;
    bool dispatch_16;
    bool dual_src_blend;
diff --git a/src/mesa/drivers/dri/i965/brw_fs.cpp b/src/mesa/drivers/dri/i965/brw_fs.cpp
index 3cdf0bf..07ac4bc 100644
--- a/src/mesa/drivers/dri/i965/brw_fs.cpp
+++ b/src/mesa/drivers/dri/i965/brw_fs.cpp
@@ -6455,6 +6455,7 @@ brw_compile_fs(const struct brw_compiler *compiler, void *log_data,
        shader->info->outputs_read);
 
    prog_data->early_fragment_tests = shader->info->fs.early_fragment_tests;
+   prog_data->post_depth_coverage = shader->info->fs.post_depth_coverage;
 
    prog_data->barycentric_interp_modes =
       brw_compute_barycentric_interp_modes(compiler->devinfo, shader);
diff --git a/src/mesa/drivers/dri/i965/gen8_ps_state.c b/src/mesa/drivers/dri/i965/gen8_ps_state.c
index a4eb962..33ef023 100644
--- a/src/mesa/drivers/dri/i965/gen8_ps_state.c
+++ b/src/mesa/drivers/dri/i965/gen8_ps_state.c
@@ -53,10 +53,17 @@ gen8_upload_ps_extra(struct brw_context *brw,
       dw1 |= GEN8_PSX_SHADER_IS_PER_SAMPLE;
 
    if (prog_data->uses_sample_mask) {
-      if (brw->gen >= 9)
-         dw1 |= BRW_PSICMS_INNER << GEN9_PSX_SHADER_NORMAL_COVERAGE_MASK_SHIFT;
-      else
+      if (brw->gen >= 9) {
+         if (prog_data->post_depth_coverage) {
+            dw1 |= BRW_PCICMS_DEPTH << GEN9_PSX_SHADER_NORMAL_COVERAGE_MASK_SHIFT;
+         }
+         else {
+            dw1 |= BRW_PSICMS_INNER << GEN9_PSX_SHADER_NORMAL_COVERAGE_MASK_SHIFT;
+         }
+      }
+      else {
          dw1 |= GEN8_PSX_SHADER_USES_INPUT_COVERAGE_MASK;
+      }
    }
 
    if (prog_data->uses_omask)
diff --git a/src/mesa/drivers/dri/i965/intel_extensions.c b/src/mesa/drivers/dri/i965/intel_extensions.c
index 66079b5..cc3d634 100644
--- a/src/mesa/drivers/dri/i965/intel_extensions.c
+++ b/src/mesa/drivers/dri/i965/intel_extensions.c
@@ -225,6 +225,7 @@ intelInitExtensions(struct gl_context *ctx)
    ctx->Extensions.ARB_vertex_shader = true;
    ctx->Extensions.ARB_vertex_type_2_10_10_10_rev = true;
    ctx->Extensions.ARB_vertex_type_10f_11f_11f_rev = true;
+   ctx->Extensions.ARB_post_depth_coverage = true;
    ctx->Extensions.EXT_blend_color = true;
    ctx->Extensions.EXT_blend_equation_separate = true;
    ctx->Extensions.EXT_blend_func_separate = true;
-- 
2.7.4