From: Matt Turner Date: Thu, 29 Aug 2013 01:01:39 +0000 (-0700) Subject: glsl: Implement MESA_shader_integer_mix extension. X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=56fff7063dd05232cf86aef9d2ae1c04c52a8360;p=mesa.git glsl: Implement MESA_shader_integer_mix extension. Because why doesn't GLSL allow you to do this already? Reviewed-by: Kenneth Graunke Reviewed-by: Ian Romanick --- diff --git a/docs/specs/MESA_shader_integer_mix.spec b/docs/specs/MESA_shader_integer_mix.spec new file mode 100644 index 00000000000..d381ddd43dd --- /dev/null +++ b/docs/specs/MESA_shader_integer_mix.spec @@ -0,0 +1,135 @@ +Name + + MESA_shader_integer_mix + +Name Strings + + GL_MESA_shader_integer_mix + +Contact + + Matt Turner (matt.turner 'at' intel.com) + +Contributors + + Matt Turner, Intel + Ian Romanick, Intel + +Status + + Shipping + +Version + + Last Modified Date: 09/09/2013 + Author Revision: 5 + +Number + + + +Dependencies + + OpenGL 3.0 or OpenGL ES 3.0 is required. This extension interacts with + GL_ARB_ES3_compatibility. + + This extension is written against the OpenGL 4.4 (core) specification + and the GLSL 4.40 specification. + +Overview + + GLSL 1.30 (and GLSL ES 3.00) expanded the mix() built-in function to + operate on a boolean third argument that does not interpolate but + selects. This extension extends mix() to select between int, uint, + and bool components. + +New Procedures and Functions + + None. + +New Tokens + + None. + +Additions to Chapter 8 of the GLSL 4.40 Specification (Built-in Functions) + + Modify Section 8.3, Common Functions + + Additions to the table listing common built-in functions: + + Syntax Description + --------------------------- -------------------------------------------------- + genIType mix(genIType x, Selects which vector each returned component comes + genIType y, from. For a component of a that is false, the + genBType a) corresponding component of x is returned. For a + genUType mix(genUType x, component of a that is true, the corresponding + genUType y, component of y is returned. + genBType a) + genBType mix(genBType x, + genBType y, + genBType a) + +Additions to the AGL/GLX/WGL Specifications + + None. + +Modifications to The OpenGL Shading Language Specification, Version 4.40 + + Including the following line in a shader can be used to control the + language features described in this extension: + + #extension GL_MESA_shader_integer_mix : + + where is as specified in section 3.3. + + New preprocessor #defines are added to the OpenGL Shading Language: + + #define GL_MESA_shader_integer_mix 1 + +Interactions with ARB_ES3_compatibility + + On desktop implementations that support ARB_ES3_compatibility, + GL_MESA_shader_integer_mix can be enabled (and the new functions + used) in shaders declared with '#version 300 es'. + +GLX Protocol + + None. + +Errors + + None. + +New State + + None. + +New Implementation Dependent State + + None. + +Issues + + 1) Should we allow linear interpolation of integers via a non-boolean + third component? + + RESOLVED: No. + + 2) Should we allow mix() to select between boolean components? + + RESOLVED: Yes. Implementing the same functionality using casts would be + possible but ugly. + +Revision History + + Rev. Date Author Changes + ---- -------- -------- --------------------------------------------- + 5 09/09/2013 idr Add ARB_ES3_compatibility interaction. + + 4 09/06/2013 mattst88 Allow extension on OpenGL ES 3.0. + + 3 08/28/2013 mattst88 Add #extension/#define changes. + + 2 08/26/2013 mattst88 Change vendor prefix to MESA. Add mix() that + selects between boolean components. + 1 08/26/2013 mattst88 Initial revision 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 @@ -187,6 +187,12 @@ shader_bit_encoding(const _mesa_glsl_parse_state *state) state->ARB_gpu_shader5_enable; } +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) { @@ -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;