glsl: add support for GL_OES_EGL_image_external

This extension introduces a new sampler type: samplerExternalOES.
texture2D (and texture2DProj) can be used to do a texture look up in an
external texture.

Reviewed-by: Brian Paul <brianp@vmware.com>
Acked-by: Jakob Bornecrantz <jakob@vmware.com>
Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>

src/glsl/ast.h

@@ -437,6 +437,7 @@ enum ast_types {
    ast_sampler2drect,
    ast_sampler3d,
    ast_samplercube,
+   ast_samplerexternaloes,
    ast_sampler1dshadow,
    ast_sampler2dshadow,
    ast_sampler2drectshadow,

src/glsl/ast_type.cpp

@@ -83,6 +83,7 @@ ast_type_specifier::ast_type_specifier(int specifier)
       "sampler2DRect",
       "sampler3D",
       "samplerCube",
+      "samplerExternalOES",
       "sampler1DShadow",
       "sampler2DShadow",
       "sampler2DRectShadow",

src/glsl/builtin_types.h

@@ -300,3 +300,13 @@ const glsl_type glsl_type::builtin_EXT_texture_buffer_object_types[] = {
 	     GLSL_SAMPLER_DIM_BUF, 0, 0,  GLSL_TYPE_UINT, "usamplerBuffer"),
 };
 /*@}*/
+
+/** \name Sampler types added by GL_OES_EGL_image_external
+ */
+/*@{*/
+
+const glsl_type glsl_type::builtin_OES_EGL_image_external_types[] = {
+   glsl_type(GL_SAMPLER_EXTERNAL_OES,
+	     GLSL_SAMPLER_DIM_EXTERNAL, 0, 0, GLSL_TYPE_FLOAT, "samplerExternalOES"),
+};
+/*@}*/

src/glsl/builtins/profiles/OES_EGL_image_external.frag

@@ -0,0 +1,6 @@
+#version 100
+#extension GL_OES_EGL_image_external : enable
+
+vec4 texture2D(samplerExternalOES sampler, vec2 coord);
+vec4 texture2DProj(samplerExternalOES sampler, vec3 coord);
+vec4 texture2DProj(samplerExternalOES sampler, vec4 coord);

src/glsl/builtins/profiles/OES_EGL_image_external.vert

@@ -0,0 +1,6 @@
+#version 100
+#extension GL_OES_EGL_image_external : enable
+
+vec4 texture2D(samplerExternalOES sampler, vec2 coord);
+vec4 texture2DProj(samplerExternalOES sampler, vec3 coord);
+vec4 texture2DProj(samplerExternalOES sampler, vec4 coord);

src/glsl/builtins/tools/generate_builtins.py

@@ -164,6 +164,7 @@ read_builtins(GLenum target, const char *protos, const char **functions, unsigne
    st->symbols->language_version = 130;
    st->ARB_texture_rectangle_enable = true;
    st->EXT_texture_array_enable = true;
+   st->OES_EGL_image_external_enable = true;
    _mesa_glsl_initialize_types(st);
 
    sh->ir = new(sh) exec_list;

src/glsl/builtins/tools/texture_builtins.py

@@ -23,6 +23,8 @@ def get_sampler_dim(sampler_type):
         sampler_dim = int(sampler_type[0])
     elif sampler_type.startswith("Cube"):
         sampler_dim = 3
+    elif sampler_type == "ExternalOES":
+        sampler_dim = 2
     else:
         assert False ("coord_dim: invalid sampler_type: " + sampler_type)
     return sampler_dim
@@ -480,6 +482,8 @@ def generate_texture_functions(fs):
     start_function("texture2D")
     generate_sigs("", "tex", "2D")
     generate_sigs("", "txb", "2D")
+    # OES_EGL_image_external
+    generate_sigs("", "tex", "ExternalOES")
     end_function(fs, "texture2D")
 
     start_function("texture2DLod")
@@ -491,6 +495,9 @@ def generate_texture_functions(fs):
     generate_sigs("", "tex", "2D", Proj, 1)
     generate_sigs("", "txb", "2D", Proj)
     generate_sigs("", "txb", "2D", Proj, 1)
+    # OES_EGL_image_external
+    generate_sigs("", "tex", "ExternalOES", Proj)
+    generate_sigs("", "tex", "ExternalOES", Proj, 1)
     end_function(fs, "texture2DProj")
 
     start_function("texture2DProjLod")

src/glsl/glcpp/glcpp-parse.y

@@ -1136,6 +1136,9 @@ glcpp_parser_create (const struct gl_extensions *extensions, int api)
 	      add_builtin_define(parser, "GL_AMD_conservative_depth", 1);
 	      add_builtin_define(parser, "GL_ARB_conservative_depth", 1);
 	   }
+
+	   if (extensions->OES_EGL_image_external)
+	      add_builtin_define(parser, "GL_OES_EGL_image_external", 1);
 	}
 
 	language_version = 110;

src/glsl/glsl_lexer.ll

@@ -296,6 +296,13 @@ usamplerCube		KEYWORD(130, 130, USAMPLERCUBE);
 usampler1DArray		KEYWORD(130, 130, USAMPLER1DARRAY);
 usampler2DArray		KEYWORD(130, 130, USAMPLER2DARRAY);
 
+samplerExternalOES	{
+			  if (yyextra->OES_EGL_image_external_enable)
+			     return SAMPLEREXTERNALOES;
+			  else
+			     return IDENTIFIER;
+			}
+
 
 struct		return STRUCT;
 void		return VOID_TOK;

src/glsl/glsl_parser.yy

@@ -92,6 +92,7 @@
 %token SAMPLER2DARRAYSHADOW ISAMPLER1D ISAMPLER2D ISAMPLER3D ISAMPLERCUBE
 %token ISAMPLER1DARRAY ISAMPLER2DARRAY USAMPLER1D USAMPLER2D USAMPLER3D
 %token USAMPLERCUBE USAMPLER1DARRAY USAMPLER2DARRAY
+%token SAMPLEREXTERNALOES
 %token STRUCT VOID_TOK WHILE
 %token <identifier> IDENTIFIER TYPE_IDENTIFIER NEW_IDENTIFIER
 %type <identifier> any_identifier
@@ -1368,6 +1369,7 @@ basic_type_specifier_nonarray:
 	| SAMPLER2DRECT		{ $$ = ast_sampler2drect; }
 	| SAMPLER3D		{ $$ = ast_sampler3d; }
 	| SAMPLERCUBE		{ $$ = ast_samplercube; }
+	| SAMPLEREXTERNALOES	{ $$ = ast_samplerexternaloes; }
 	| SAMPLER1DSHADOW	{ $$ = ast_sampler1dshadow; }
 	| SAMPLER2DSHADOW	{ $$ = ast_sampler2dshadow; }
 	| SAMPLER2DRECTSHADOW	{ $$ = ast_sampler2drectshadow; }

src/glsl/glsl_parser_extras.cpp

@@ -267,6 +267,7 @@ static const _mesa_glsl_extension _mesa_glsl_supported_extensions[] = {
    EXT(AMD_conservative_depth,         true,  false, true,  true,  false,     AMD_conservative_depth),
    EXT(AMD_shader_stencil_export,      false, false, true,  true,  false,     ARB_shader_stencil_export),
    EXT(OES_texture_3D,                 true,  false, true,  false, true,      EXT_texture3D),
+   EXT(OES_EGL_image_external,         true,  false, true,  false, true,      OES_EGL_image_external),
 };
 
 #undef EXT

src/glsl/glsl_parser_extras.h

@@ -186,6 +186,8 @@ struct _mesa_glsl_parse_state {
    bool AMD_shader_stencil_export_warn;
    bool OES_texture_3D_enable;
    bool OES_texture_3D_warn;
+   bool OES_EGL_image_external_enable;
+   bool OES_EGL_image_external_warn;
    /*@}*/
 
    /** Extensions supported by the OpenGL implementation. */

src/glsl/glsl_types.cpp

@@ -202,6 +202,15 @@ glsl_type::generate_OES_texture_3D_types(glsl_symbol_table *symtab, bool warn)
 }
 
 
+void
+glsl_type::generate_OES_EGL_image_external_types(glsl_symbol_table *symtab,
+						 bool warn)
+{
+   add_types_to_symbol_table(symtab, builtin_OES_EGL_image_external_types,
+			     Elements(builtin_OES_EGL_image_external_types),
+			     warn);
+}
+
 void
 _mesa_glsl_initialize_types(struct _mesa_glsl_parse_state *state)
 {
@@ -238,6 +247,15 @@ _mesa_glsl_initialize_types(struct _mesa_glsl_parse_state *state)
       glsl_type::generate_EXT_texture_array_types(state->symbols,
 				       state->EXT_texture_array_warn);
    }
+
+   /* We cannot check for language_version == 100 here because we need the
+    * types to support fixed-function program generation.  But this is fine
+    * since the extension is never enabled for OpenGL contexts.
+    */
+   if (state->OES_EGL_image_external_enable) {
+      glsl_type::generate_OES_EGL_image_external_types(state->symbols,
+					       state->OES_EGL_image_external_warn);
+   }
 }
 
 

src/glsl/glsl_types.h

@@ -62,7 +62,8 @@ enum glsl_sampler_dim {
    GLSL_SAMPLER_DIM_3D,
    GLSL_SAMPLER_DIM_CUBE,
    GLSL_SAMPLER_DIM_RECT,
-   GLSL_SAMPLER_DIM_BUF
+   GLSL_SAMPLER_DIM_BUF,
+   GLSL_SAMPLER_DIM_EXTERNAL
 };
 
 
@@ -489,6 +490,7 @@ private:
    static const glsl_type builtin_ARB_texture_rectangle_types[];
    static const glsl_type builtin_EXT_texture_array_types[];
    static const glsl_type builtin_EXT_texture_buffer_object_types[];
+   static const glsl_type builtin_OES_EGL_image_external_types[];
    /*@}*/
 
    /**
@@ -507,6 +509,7 @@ private:
    static void generate_ARB_texture_rectangle_types(glsl_symbol_table *, bool);
    static void generate_EXT_texture_array_types(glsl_symbol_table *, bool);
    static void generate_OES_texture_3D_types(glsl_symbol_table *, bool);
+   static void generate_OES_EGL_image_external_types(glsl_symbol_table *, bool);
    /*@}*/
 
    /**

src/glsl/standalone_scaffolding.cpp

@@ -72,6 +72,7 @@ void initialize_context_to_defaults(struct gl_context *ctx, gl_api api)
    ctx->Extensions.EXT_texture_array = true;
    ctx->Extensions.NV_texture_rectangle = true;
    ctx->Extensions.EXT_texture3D = true;
+   ctx->Extensions.OES_EGL_image_external = true;
 
    ctx->Const.GLSLVersion = 120;