[Mesa-dev] [PATCH 3/4] glsl: enable OES_sample_variables features

[Ilia Mirkin]

Add gl_MaxSamples, and enable the various other variables when this
extension or ESSL 3.20 are set.

Signed-off-by: Ilia Mirkin <imirkin at alum.mit.edu>
---
 src/compiler/glsl/builtin_variables.cpp  | 15 ++++++++++++---
 src/compiler/glsl/glsl_parser_extras.cpp |  4 ++++
 src/compiler/glsl/glsl_parser_extras.h   |  5 +++++
 3 files changed, 21 insertions(+), 3 deletions(-)

diff --git a/src/compiler/glsl/builtin_variables.cpp b/src/compiler/glsl/builtin_variables.cpp
index d20fc4a..540057d 100644
--- a/src/compiler/glsl/builtin_variables.cpp
+++ b/src/compiler/glsl/builtin_variables.cpp
@@ -867,6 +867,9 @@ builtin_variable_generator::generate_constants()
       add_const("gl_MaxTessControlUniformComponents", state->Const.MaxTessControlUniformComponents);
       add_const("gl_MaxTessEvaluationUniformComponents", state->Const.MaxTessEvaluationUniformComponents);
    }
+
+   if (state->is_version(0, 320) || state->OES_sample_variables_enable)
+      add_const("gl_MaxSamples", state->Const.MaxSamples);
 }
 
 
@@ -876,7 +879,9 @@ builtin_variable_generator::generate_constants()
 void
 builtin_variable_generator::generate_uniforms()
 {
-   if (state->is_version(400, 0) || state->ARB_sample_shading_enable)
+   if (state->is_version(400, 320) ||
+       state->ARB_sample_shading_enable ||
+       state->OES_sample_variables_enable)
       add_uniform(int_t, "gl_NumSamples");
    add_uniform(type("gl_DepthRangeParameters"), "gl_DepthRange");
    add_uniform(array(vec4_t, VERT_ATTRIB_MAX), "gl_CurrentAttribVertMESA");
@@ -1129,7 +1134,9 @@ builtin_variable_generator::generate_fs_special_vars()
          var->enable_extension_warning("GL_AMD_shader_stencil_export");
    }
 
-   if (state->is_version(400, 0) || state->ARB_sample_shading_enable) {
+   if (state->is_version(400, 320) ||
+       state->ARB_sample_shading_enable ||
+       state->OES_sample_variables_enable) {
       add_system_value(SYSTEM_VALUE_SAMPLE_ID, int_t, "gl_SampleID");
       add_system_value(SYSTEM_VALUE_SAMPLE_POS, vec2_t, "gl_SamplePosition");
       /* From the ARB_sample_shading specification:
@@ -1142,7 +1149,9 @@ builtin_variable_generator::generate_fs_special_vars()
       add_output(FRAG_RESULT_SAMPLE_MASK, array(int_t, 1), "gl_SampleMask");
    }
 
-   if (state->is_version(400, 0) || state->ARB_gpu_shader5_enable) {
+   if (state->is_version(400, 320) ||
+       state->ARB_gpu_shader5_enable ||
+       state->OES_sample_variables_enable) {
       add_system_value(SYSTEM_VALUE_SAMPLE_MASK_IN, array(int_t, 1), "gl_SampleMaskIn");
    }
 
diff --git a/src/compiler/glsl/glsl_parser_extras.cpp b/src/compiler/glsl/glsl_parser_extras.cpp
index fbac836..0aac060 100644
--- a/src/compiler/glsl/glsl_parser_extras.cpp
+++ b/src/compiler/glsl/glsl_parser_extras.cpp
@@ -175,6 +175,9 @@ _mesa_glsl_parse_state::_mesa_glsl_parse_state(struct gl_context *_ctx,
    this->Const.MaxTessControlUniformComponents = ctx->Const.Program[MESA_SHADER_TESS_CTRL].MaxUniformComponents;
    this->Const.MaxTessEvaluationUniformComponents = ctx->Const.Program[MESA_SHADER_TESS_EVAL].MaxUniformComponents;
 
+   /* OES_sample_variables */
+   this->Const.MaxSamples = ctx->Const.MaxSamples;
+
    this->current_function = NULL;
    this->toplevel_ir = NULL;
    this->found_return = false;
@@ -606,6 +609,7 @@ static const _mesa_glsl_extension _mesa_glsl_supported_extensions[] = {
    EXT(OES_EGL_image_external,         false, true,      OES_EGL_image_external),
    EXT(OES_geometry_point_size,        false, true,      OES_geometry_shader),
    EXT(OES_geometry_shader,            false, true,      OES_geometry_shader),
+   EXT(OES_sample_variables,           false, true,      OES_sample_variables),
    EXT(OES_standard_derivatives,       false, true,      OES_standard_derivatives),
    EXT(OES_texture_3D,                 false, true,      dummy_true),
    EXT(OES_texture_storage_multisample_2d_array, false, true, ARB_texture_multisample),
diff --git a/src/compiler/glsl/glsl_parser_extras.h b/src/compiler/glsl/glsl_parser_extras.h
index 5f6ca6a..5513345 100644
--- a/src/compiler/glsl/glsl_parser_extras.h
+++ b/src/compiler/glsl/glsl_parser_extras.h
@@ -457,6 +457,9 @@ struct _mesa_glsl_parse_state {
       unsigned MaxTessControlTotalOutputComponents;
       unsigned MaxTessControlUniformComponents;
       unsigned MaxTessEvaluationUniformComponents;
+
+      /* OES_sample_variables */
+      unsigned MaxSamples;
    } Const;
 
    /**
@@ -593,6 +596,8 @@ struct _mesa_glsl_parse_state {
    bool OES_geometry_point_size_warn;
    bool OES_geometry_shader_enable;
    bool OES_geometry_shader_warn;
+   bool OES_sample_variables_enable;
+   bool OES_sample_variables_warn;
    bool OES_standard_derivatives_enable;
    bool OES_standard_derivatives_warn;
    bool OES_texture_3D_enable;
-- 
2.4.10