mesa: add GL_OES_shader_multisample_interpolation 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>

5 files changed, 14 insertions, 7 deletions

diff --git a/src/compiler/glsl/builtin_functions.cpp b/src/compiler/glsl/builtin_functions.cpp
index 62f07b2..65309fd 100644
--- a/src/compiler/glsl/builtin_functions.cpp
+++ b/src/compiler/glsl/builtin_functions.cpp
@@ -264,10 +264,12 @@ shader_packing_or_es31_or_gpu_shader5(const _mesa_glsl_parse_state *state)
 }
 
 static bool
-fs_gpu_shader5(const _mesa_glsl_parse_state *state)
+fs_interpolate_at(const _mesa_glsl_parse_state *state)
 {
    return state->stage == MESA_SHADER_FRAGMENT &&
-          (state->is_version(400, 0) || state->ARB_gpu_shader5_enable);
+          (state->is_version(400, 320) ||
+           state->ARB_gpu_shader5_enable ||
+           state->OES_shader_multisample_interpolation_enable);
 }
 
 
@@ -5165,7 +5167,7 @@ builtin_builder::_interpolateAtCentroid(const glsl_type *type)
 {
    ir_variable *interpolant = in_var(type, "interpolant");
    interpolant->data.must_be_shader_input = 1;
-   MAKE_SIG(type, fs_gpu_shader5, 1, interpolant);
+   MAKE_SIG(type, fs_interpolate_at, 1, interpolant);
 
    body.emit(ret(interpolate_at_centroid(interpolant)));
 
@@ -5178,7 +5180,7 @@ builtin_builder::_interpolateAtOffset(const glsl_type *type)
    ir_variable *interpolant = in_var(type, "interpolant");
    interpolant->data.must_be_shader_input = 1;
    ir_variable *offset = in_var(glsl_type::vec2_type, "offset");
-   MAKE_SIG(type, fs_gpu_shader5, 2, interpolant, offset);
+   MAKE_SIG(type, fs_interpolate_at, 2, interpolant, offset);
 
    body.emit(ret(interpolate_at_offset(interpolant, offset)));
 
@@ -5191,7 +5193,7 @@ builtin_builder::_interpolateAtSample(const glsl_type *type)
    ir_variable *interpolant = in_var(type, "interpolant");
    interpolant->data.must_be_shader_input = 1;
    ir_variable *sample_num = in_var(glsl_type::int_type, "sample_num");
-   MAKE_SIG(type, fs_gpu_shader5, 2, interpolant, sample_num);
+   MAKE_SIG(type, fs_interpolate_at, 2, interpolant, sample_num);
 
    body.emit(ret(interpolate_at_sample(interpolant, sample_num)));
 
diff --git a/src/compiler/glsl/glcpp/glcpp-parse.y b/src/compiler/glsl/glcpp/glcpp-parse.y
index 14d2c7d..e8646c0 100644
--- a/src/compiler/glsl/glcpp/glcpp-parse.y
+++ b/src/compiler/glsl/glcpp/glcpp-parse.y
@@ -2371,8 +2371,10 @@ _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)
+              if (extensions->OES_sample_variables) {
                  add_builtin_define(parser, "GL_OES_sample_variables", 1);
+                 add_builtin_define(parser, "GL_OES_shader_multisample_interpolation", 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_lexer.ll b/src/compiler/glsl/glsl_lexer.ll
index 5492045..0b7695f 100644
--- a/src/compiler/glsl/glsl_lexer.ll
+++ b/src/compiler/glsl/glsl_lexer.ll
@@ -584,7 +584,7 @@ usamplerBuffer	KEYWORD_WITH_ALT(140, 300, 140, 320, yyextra->EXT_texture_buffer_
 
     /* Additional reserved words in GLSL ES 3.00 */
 resource	KEYWORD(0, 300, 0, 0, RESOURCE);
-sample		KEYWORD_WITH_ALT(400, 300, 400, 0, yyextra->ARB_gpu_shader5_enable, SAMPLE);
+sample		KEYWORD_WITH_ALT(400, 300, 400, 320, yyextra->ARB_gpu_shader5_enable || yyextra->OES_shader_multisample_interpolation_enable, SAMPLE);
 subroutine	KEYWORD_WITH_ALT(400, 300, 400, 0, yyextra->ARB_shader_subroutine_enable, SUBROUTINE);
 
 
diff --git a/src/compiler/glsl/glsl_parser_extras.cpp b/src/compiler/glsl/glsl_parser_extras.cpp
index def86e1..3dc6874 100644
--- a/src/compiler/glsl/glsl_parser_extras.cpp
+++ b/src/compiler/glsl/glsl_parser_extras.cpp
@@ -617,6 +617,7 @@ static const _mesa_glsl_extension _mesa_glsl_supported_extensions[] = {
    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_shader_multisample_interpolation, 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_buffer,             false, true,      OES_texture_buffer),
diff --git a/src/compiler/glsl/glsl_parser_extras.h b/src/compiler/glsl/glsl_parser_extras.h
index 219fb42..0cc2d25 100644
--- a/src/compiler/glsl/glsl_parser_extras.h
+++ b/src/compiler/glsl/glsl_parser_extras.h
@@ -608,6 +608,8 @@ struct _mesa_glsl_parse_state {
    bool OES_sample_variables_warn;
    bool OES_shader_image_atomic_enable;
    bool OES_shader_image_atomic_warn;
+   bool OES_shader_multisample_interpolation_enable;
+   bool OES_shader_multisample_interpolation_warn;
    bool OES_standard_derivatives_enable;
    bool OES_standard_derivatives_warn;
    bool OES_texture_3D_enable;