glsl: Implement MESA_shader_integer_mix extension.

Because why doesn't GLSL allow you to do this already?

Reviewed-by: Kenneth Graunke <[email protected]>
Reviewed-by: Ian Romanick <[email protected]>

6 files changed, 41 insertions, 8 deletions

diff --git a/src/glsl/builtin_functions.cpp b/src/glsl/builtin_functions.cpp
index 0139b6ff01f..eca41aacefb 100644
--- a/src/glsl/builtin_functions.cpp
+++ b/src/glsl/builtin_functions.cpp
@@ -188,6 +188,12 @@ shader_bit_encoding(const _mesa_glsl_parse_state *state)
 }
 
 static bool
+shader_integer_mix(const _mesa_glsl_parse_state *state)
+{
+   return v130(state) && state->MESA_shader_integer_mix_enable;
+}
+
+static bool
 shader_packing(const _mesa_glsl_parse_state *state)
 {
    return state->ARB_shading_language_packing_enable ||
@@ -415,7 +421,9 @@ private:
    BA2(max)
    BA2(clamp)
    B2(mix_lrp)
-   B2(mix_sel)
+   ir_function_signature *_mix_sel(builtin_available_predicate avail,
+                                   const glsl_type *val_type,
+                                   const glsl_type *blend_type);
    B2(step)
    B2(smoothstep)
    B1(isnan)
@@ -773,10 +781,25 @@ builtin_builder::create_builtins()
                 _mix_lrp(glsl_type::vec3_type,  glsl_type::vec3_type),
                 _mix_lrp(glsl_type::vec4_type,  glsl_type::vec4_type),
 
-                _mix_sel(glsl_type::float_type, glsl_type::bool_type),
-                _mix_sel(glsl_type::vec2_type,  glsl_type::bvec2_type),
-                _mix_sel(glsl_type::vec3_type,  glsl_type::bvec3_type),
-                _mix_sel(glsl_type::vec4_type,  glsl_type::bvec4_type),
+                _mix_sel(v130, glsl_type::float_type, glsl_type::bool_type),
+                _mix_sel(v130, glsl_type::vec2_type,  glsl_type::bvec2_type),
+                _mix_sel(v130, glsl_type::vec3_type,  glsl_type::bvec3_type),
+                _mix_sel(v130, glsl_type::vec4_type,  glsl_type::bvec4_type),
+
+                _mix_sel(shader_integer_mix, glsl_type::int_type,   glsl_type::bool_type),
+                _mix_sel(shader_integer_mix, glsl_type::ivec2_type, glsl_type::bvec2_type),
+                _mix_sel(shader_integer_mix, glsl_type::ivec3_type, glsl_type::bvec3_type),
+                _mix_sel(shader_integer_mix, glsl_type::ivec4_type, glsl_type::bvec4_type),
+
+                _mix_sel(shader_integer_mix, glsl_type::uint_type,  glsl_type::bool_type),
+                _mix_sel(shader_integer_mix, glsl_type::uvec2_type, glsl_type::bvec2_type),
+                _mix_sel(shader_integer_mix, glsl_type::uvec3_type, glsl_type::bvec3_type),
+                _mix_sel(shader_integer_mix, glsl_type::uvec4_type, glsl_type::bvec4_type),
+
+                _mix_sel(shader_integer_mix, glsl_type::bool_type,  glsl_type::bool_type),
+                _mix_sel(shader_integer_mix, glsl_type::bvec2_type, glsl_type::bvec2_type),
+                _mix_sel(shader_integer_mix, glsl_type::bvec3_type, glsl_type::bvec3_type),
+                _mix_sel(shader_integer_mix, glsl_type::bvec4_type, glsl_type::bvec4_type),
                 NULL);
 
    add_function("step",
@@ -2255,12 +2278,14 @@ builtin_builder::_mix_lrp(const glsl_type *val_type, const glsl_type *blend_type
 }
 
 ir_function_signature *
-builtin_builder::_mix_sel(const glsl_type *val_type, const glsl_type *blend_type)
+builtin_builder::_mix_sel(builtin_available_predicate avail,
+                          const glsl_type *val_type,
+                          const glsl_type *blend_type)
 {
    ir_variable *x = in_var(val_type, "x");
    ir_variable *y = in_var(val_type, "y");
    ir_variable *a = in_var(blend_type, "a");
-   MAKE_SIG(val_type, v130, 3, x, y, a);
+   MAKE_SIG(val_type, avail, 3, x, y, a);
 
    /* csel matches the ternary operator in that a selector of true choses the
     * first argument. This differs from mix(x, y, false) which choses the
diff --git a/src/glsl/glcpp/glcpp-parse.y b/src/glsl/glcpp/glcpp-parse.y
index ff5bdfe5db5..fb1c1d0466d 100644
--- a/src/glsl/glcpp/glcpp-parse.y
+++ b/src/glsl/glcpp/glcpp-parse.y
@@ -1245,6 +1245,9 @@ glcpp_parser_create (const struct gl_extensions *extensions, int api)
 
 	      if (extensions->ARB_shading_language_420pack)
 	         add_builtin_define(parser, "GL_ARB_shading_language_420pack", 1);
+
+	      if (extensions->MESA_shader_integer_mix)
+	         add_builtin_define(parser, "GL_MESA_shader_integer_mix", 1);
 	   }
 	}
 
diff --git a/src/glsl/glsl_parser_extras.cpp b/src/glsl/glsl_parser_extras.cpp
index cd3907ae2bb..1e4d7c7abf0 100644
--- a/src/glsl/glsl_parser_extras.cpp
+++ b/src/glsl/glsl_parser_extras.cpp
@@ -517,6 +517,7 @@ static const _mesa_glsl_extension _mesa_glsl_supported_extensions[] = {
    EXT(ARB_texture_query_lod,          true,  false,     ARB_texture_query_lod),
    EXT(ARB_gpu_shader5,                true,  false,     ARB_gpu_shader5),
    EXT(AMD_vertex_shader_layer,        true,  false,     AMD_vertex_shader_layer),
+   EXT(MESA_shader_integer_mix,        true,   true,     MESA_shader_integer_mix),
 };
 
 #undef EXT
diff --git a/src/glsl/glsl_parser_extras.h b/src/glsl/glsl_parser_extras.h
index c4443ac485e..15abbbc9916 100644
--- a/src/glsl/glsl_parser_extras.h
+++ b/src/glsl/glsl_parser_extras.h
@@ -315,6 +315,8 @@ struct _mesa_glsl_parse_state {
    bool AMD_vertex_shader_layer_warn;
    bool ARB_shading_language_420pack_enable;
    bool ARB_shading_language_420pack_warn;
+   bool MESA_shader_integer_mix_enable;
+   bool MESA_shader_integer_mix_warn;
    /*@}*/
 
    /** Extensions supported by the OpenGL implementation. */
diff --git a/src/mesa/main/extensions.c b/src/mesa/main/extensions.c
index f60157f8cce..88fcde3b90b 100644
--- a/src/mesa/main/extensions.c
+++ b/src/mesa/main/extensions.c
@@ -311,6 +311,7 @@ static const struct extension extension_table[] = {
    { "GL_IBM_texture_mirrored_repeat",             o(dummy_true),                              GLL,            1998 },
    { "GL_INGR_blend_func_separate",                o(EXT_blend_func_separate),                 GLL,            1999 },
    { "GL_MESA_pack_invert",                        o(MESA_pack_invert),                        GL,             2002 },
+   { "GL_MESA_shader_integer_mix",                 o(MESA_shader_integer_mix),                 GL       | ES3, 2013 },
    { "GL_MESA_texture_array",                      o(MESA_texture_array),                      GLL,            2007 },
    { "GL_MESA_texture_signed_rgba",                o(EXT_texture_snorm),                       GL,             2009 },
    { "GL_MESA_window_pos",                         o(dummy_true),                              GLL,            2000 },
diff --git a/src/mesa/main/mtypes.h b/src/mesa/main/mtypes.h
index ef16c5910a6..ca7111e509b 100644
--- a/src/mesa/main/mtypes.h
+++ b/src/mesa/main/mtypes.h
@@ -3154,8 +3154,9 @@ struct gl_extensions
    GLboolean ATI_fragment_shader;
    GLboolean ATI_separate_stencil;
    GLboolean MESA_pack_invert;
-   GLboolean MESA_ycbcr_texture;
+   GLboolean MESA_shader_integer_mix;
    GLboolean MESA_texture_array;
+   GLboolean MESA_ycbcr_texture;
    GLboolean NV_conditional_render;
    GLboolean NV_fog_distance;
    GLboolean NV_fragment_program_option;