glsl: Add textureSamplesIdenticalEXT built-in functions

Signed-off-by: Ian Romanick <ian.d.romanick@intel.com>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Chris Forbes <chrisf@ijw.co.nz>

diff --git a/src/glsl/builtin_functions.cpp b/src/glsl/builtin_functions.cpp
index 1824b831f2861f055da056a6115a542160966434..881ee2b6b55d4937a689f6d3bd7aa665483f26dd 100644 (file)
--- a/src/glsl/builtin_functions.cpp
+++ b/src/glsl/builtin_functions.cpp
@@ -289,6 +289,20 @@ texture_multisample_array(const _mesa_glsl_parse_state *state)
           state->OES_texture_storage_multisample_2d_array_enable;
 }
 
+static bool
+texture_samples_identical(const _mesa_glsl_parse_state *state)
+{
+   return texture_multisample(state) &&
+          state->EXT_shader_samples_identical_enable;
+}
+
+static bool
+texture_samples_identical_array(const _mesa_glsl_parse_state *state)
+{
+   return texture_multisample_array(state) &&
+          state->EXT_shader_samples_identical_enable;
+}
+
 static bool
 fs_texture_cube_map_array(const _mesa_glsl_parse_state *state)
 {
@@ -724,6 +738,7 @@ private:
 
    BA2(textureQueryLod);
    B1(textureQueryLevels);
+   BA2(textureSamplesIdentical);
    B1(dFdx);
    B1(dFdy);
    B1(fwidth);
@@ -2210,6 +2225,16 @@ builtin_builder::create_builtins()
 
                 NULL);
 
+   add_function("textureSamplesIdenticalEXT",
+                _textureSamplesIdentical(texture_samples_identical, glsl_type::sampler2DMS_type,  glsl_type::ivec2_type),
+                _textureSamplesIdentical(texture_samples_identical, glsl_type::isampler2DMS_type, glsl_type::ivec2_type),
+                _textureSamplesIdentical(texture_samples_identical, glsl_type::usampler2DMS_type, glsl_type::ivec2_type),
+
+                _textureSamplesIdentical(texture_samples_identical_array, glsl_type::sampler2DMSArray_type,  glsl_type::ivec3_type),
+                _textureSamplesIdentical(texture_samples_identical_array, glsl_type::isampler2DMSArray_type, glsl_type::ivec3_type),
+                _textureSamplesIdentical(texture_samples_identical_array, glsl_type::usampler2DMSArray_type, glsl_type::ivec3_type),
+                NULL);
+
    add_function("texture1D",
                 _texture(ir_tex, v110,         glsl_type::vec4_type,  glsl_type::sampler1D_type, glsl_type::float_type),
                 _texture(ir_txb, v110_fs_only, glsl_type::vec4_type,  glsl_type::sampler1D_type, glsl_type::float_type),
@@ -4684,6 +4709,25 @@ builtin_builder::_textureQueryLevels(const glsl_type *sampler_type)
    return sig;
 }
 
+ir_function_signature *
+builtin_builder::_textureSamplesIdentical(builtin_available_predicate avail,
+                                          const glsl_type *sampler_type,
+                                          const glsl_type *coord_type)
+{
+   ir_variable *s = in_var(sampler_type, "sampler");
+   ir_variable *P = in_var(coord_type, "P");
+   const glsl_type *return_type = glsl_type::bool_type;
+   MAKE_SIG(return_type, avail, 2, s, P);
+
+   ir_texture *tex = new(mem_ctx) ir_texture(ir_samples_identical);
+   tex->coordinate = var_ref(P);
+   tex->set_sampler(var_ref(s), return_type);
+
+   body.emit(ret(tex));
+
+   return sig;
+}
+
 UNOP(dFdx, ir_unop_dFdx, fs_oes_derivatives)
 UNOP(dFdxCoarse, ir_unop_dFdx_coarse, fs_derivative_control)
 UNOP(dFdxFine, ir_unop_dFdx_fine, fs_derivative_control)