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>

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)));
 

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)

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);
 
 

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),

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;

src/mesa/main/extensions_table.h

@@ -333,6 +333,7 @@ EXT(OES_rgb8_rgba8                          , dummy_true
 EXT(OES_sample_shading                      , OES_sample_variables                   ,  x ,  x ,  x ,  30, 2014)
 EXT(OES_sample_variables                    , OES_sample_variables                   ,  x ,  x ,  x ,  30, 2014)
 EXT(OES_shader_image_atomic                 , ARB_shader_image_load_store            ,  x ,  x ,  x ,  31, 2015)
+EXT(OES_shader_multisample_interpolation    , OES_sample_variables                   ,  x ,  x ,  x ,  30, 2014)
 EXT(OES_single_precision                    , dummy_true                             ,  x ,  x , ES1,  x , 2003)
 EXT(OES_standard_derivatives                , OES_standard_derivatives               ,  x ,  x ,  x , ES2, 2005)
 EXT(OES_stencil1                            , dummy_false                            ,  x ,  x ,  x ,  x , 2005)

src/mesa/main/get.c

@@ -408,6 +408,11 @@ static const int extra_ARB_gpu_shader5_or_oes_geometry_shader[] = {
    EXTRA_END
 };
 
+static const int extra_ARB_gpu_shader5_or_OES_sample_variables[] = {
+   EXT(ARB_gpu_shader5),
+   EXT(OES_sample_variables),
+};
+
 EXTRA_EXT(ARB_texture_cube_map);
 EXTRA_EXT(EXT_texture_array);
 EXTRA_EXT(NV_fog_distance);

src/mesa/main/get_hash_params.py

@@ -503,6 +503,14 @@ descriptor=[
   [ "MAX_COMBINED_SHADER_OUTPUT_RESOURCES", "CONTEXT_INT(Const.MaxCombinedShaderOutputResources), extra_ARB_shader_image_load_store_shader_storage_buffer_object_es31" ],
 ]},
 
+# Enums in OpenGL Core profile and ES 3.0
+{ "apis": ["GL_CORE", "GLES3"], "params": [
+  # GL_ARB_gpu_shader5 / GL_OES_shader_multisample_interpolation
+  [ "MIN_FRAGMENT_INTERPOLATION_OFFSET", "CONTEXT_FLOAT(Const.MinFragmentInterpolationOffset), extra_ARB_gpu_shader5_or_OES_sample_variables" ],
+  [ "MAX_FRAGMENT_INTERPOLATION_OFFSET", "CONTEXT_FLOAT(Const.MaxFragmentInterpolationOffset), extra_ARB_gpu_shader5_or_OES_sample_variables" ],
+  [ "FRAGMENT_INTERPOLATION_OFFSET_BITS", "CONST(FRAGMENT_INTERPOLATION_OFFSET_BITS), extra_ARB_gpu_shader5_or_OES_sample_variables" ],
+]},
+
 # Enums in OpenGL Core profile and ES 3.1
 { "apis": ["GL_CORE", "GLES31"], "params": [
 # GL_ARB_draw_indirect / GLES 3.1
@@ -882,9 +890,6 @@ descriptor=[
 
 # GL_ARB_gpu_shader5
   [ "MAX_GEOMETRY_SHADER_INVOCATIONS", "CONST(MAX_GEOMETRY_SHADER_INVOCATIONS), extra_ARB_gpu_shader5" ],
-  [ "MIN_FRAGMENT_INTERPOLATION_OFFSET", "CONTEXT_FLOAT(Const.MinFragmentInterpolationOffset), extra_ARB_gpu_shader5" ],
-  [ "MAX_FRAGMENT_INTERPOLATION_OFFSET", "CONTEXT_FLOAT(Const.MaxFragmentInterpolationOffset), extra_ARB_gpu_shader5" ],
-  [ "FRAGMENT_INTERPOLATION_OFFSET_BITS", "CONST(FRAGMENT_INTERPOLATION_OFFSET_BITS), extra_ARB_gpu_shader5" ],
 
 # GL_ARB_tessellation_shader
   [ "PATCH_VERTICES", "CONTEXT_INT(TessCtrlProgram.patch_vertices), extra_ARB_tessellation_shader" ],