mesa: Add GL and GLSL plumbing for ARB_post_depth_coverage for i965 (gen9+).

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 <[email protected]>
Reviewed-by: Chris Forbes <[email protected]>

1 files changed, 4 insertions, 0 deletions

diff --git a/src/compiler/glsl/glsl_parser_extras.cpp b/src/compiler/glsl/glsl_parser_extras.cpp
index 1e0298eb84e..d1fc98dd14e 100644
--- a/src/compiler/glsl/glsl_parser_extras.cpp
+++ b/src/compiler/glsl/glsl_parser_extras.cpp
@@ -293,6 +293,7 @@ _mesa_glsl_parse_state::_mesa_glsl_parse_state(struct gl_context *_ctx,
    this->in_qualifier = new(this) ast_type_qualifier();
    this->out_qualifier = new(this) ast_type_qualifier();
    this->fs_early_fragment_tests = false;
+   this->fs_post_depth_coverage = false;
    this->fs_blend_support = 0;
    memset(this->atomic_counter_offsets, 0,
           sizeof(this->atomic_counter_offsets));
@@ -606,6 +607,7 @@ static const _mesa_glsl_extension _mesa_glsl_supported_extensions[] = {
    EXT(ARB_fragment_layer_viewport),
    EXT(ARB_gpu_shader5),
    EXT(ARB_gpu_shader_fp64),
+   EXT(ARB_post_depth_coverage),
    EXT(ARB_sample_shading),
    EXT(ARB_separate_shader_objects),
    EXT(ARB_shader_atomic_counter_ops),
@@ -1690,6 +1692,7 @@ set_shader_inout_layout(struct gl_shader *shader,
       assert(!state->fs_pixel_center_integer);
       assert(!state->fs_origin_upper_left);
       assert(!state->fs_early_fragment_tests);
+      assert(!state->fs_post_depth_coverage);
    }
 
    for (unsigned i = 0; i < MAX_FEEDBACK_BUFFERS; i++) {
@@ -1810,6 +1813,7 @@ set_shader_inout_layout(struct gl_shader *shader,
       shader->info.ARB_fragment_coord_conventions_enable =
          state->ARB_fragment_coord_conventions_enable;
       shader->info.EarlyFragmentTests = state->fs_early_fragment_tests;
+      shader->info.PostDepthCoverage = state->fs_post_depth_coverage;
       shader->info.BlendSupport = state->fs_blend_support;
       break;