glsl: add GL_OES_sample_variables support

Signed-off-by: Ilia Mirkin <imirkin@alum.mit.edu>
Reviewed-by: Dave Airlie <airlied@redhat.com>
Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>

4 files changed, 16 insertions, 4 deletions

diff --git a/src/compiler/glsl/builtin_variables.cpp b/src/compiler/glsl/builtin_variables.cpp
index 6a772911f76..7d77f705356 100644
--- a/src/compiler/glsl/builtin_variables.cpp
+++ b/src/compiler/glsl/builtin_variables.cpp
@@ -879,7 +879,8 @@ builtin_variable_generator::generate_constants()
       add_const("gl_MaxTessEvaluationUniformComponents", state->Const.MaxTessEvaluationUniformComponents);
    }
 
-   if (state->is_version(450, 320))
+   if (state->is_version(450, 320) ||
+       state->OES_sample_variables_enable)
       add_const("gl_MaxSamples", state->Const.MaxSamples);
 }
 
@@ -890,7 +891,9 @@ 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");
@@ -1143,7 +1146,9 @@ 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:
@@ -1156,7 +1161,9 @@ 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/glcpp/glcpp-parse.y b/src/compiler/glsl/glcpp/glcpp-parse.y
index fbbf85bfdae..14d2c7d3eff 100644
--- a/src/compiler/glsl/glcpp/glcpp-parse.y
+++ b/src/compiler/glsl/glcpp/glcpp-parse.y
@@ -2371,6 +2371,8 @@ _glcpp_parser_handle_version_declaration(glcpp_parser_t *parser, intmax_t versio
 	   if (extensions != NULL) {
 	      if (extensions->OES_EGL_image_external)
 	         add_builtin_define(parser, "GL_OES_EGL_image_external", 1);
+              if (extensions->OES_sample_variables)
+                 add_builtin_define(parser, "GL_OES_sample_variables", 1);
               if (extensions->OES_standard_derivatives)
                  add_builtin_define(parser, "GL_OES_standard_derivatives", 1);
               if (extensions->ARB_texture_multisample)
diff --git a/src/compiler/glsl/glsl_parser_extras.cpp b/src/compiler/glsl/glsl_parser_extras.cpp
index e592e5cd55c..def86e18223 100644
--- a/src/compiler/glsl/glsl_parser_extras.cpp
+++ b/src/compiler/glsl/glsl_parser_extras.cpp
@@ -615,6 +615,7 @@ static const _mesa_glsl_extension _mesa_glsl_supported_extensions[] = {
    EXT(OES_geometry_point_size,        false, true,      OES_geometry_shader),
    EXT(OES_geometry_shader,            false, true,      OES_geometry_shader),
    EXT(OES_gpu_shader5,                false, true,      ARB_gpu_shader5),
+   EXT(OES_sample_variables,           false, true,      OES_sample_variables),
    EXT(OES_shader_image_atomic,        false, true,      ARB_shader_image_load_store),
    EXT(OES_standard_derivatives,       false, true,      OES_standard_derivatives),
    EXT(OES_texture_3D,                 false, true,      dummy_true),
diff --git a/src/compiler/glsl/glsl_parser_extras.h b/src/compiler/glsl/glsl_parser_extras.h
index 6185d14a20d..219fb427c0f 100644
--- a/src/compiler/glsl/glsl_parser_extras.h
+++ b/src/compiler/glsl/glsl_parser_extras.h
@@ -604,6 +604,8 @@ struct _mesa_glsl_parse_state {
    bool OES_geometry_shader_warn;
    bool OES_gpu_shader5_enable;
    bool OES_gpu_shader5_warn;
+   bool OES_sample_variables_enable;
+   bool OES_sample_variables_warn;
    bool OES_shader_image_atomic_enable;
    bool OES_shader_image_atomic_warn;
    bool OES_standard_derivatives_enable;