Implement gl_PointCoord attribute for GLSL fragment shaders.

Contains the normalized fragment position within a point sprite.

2 files changed, 16 insertions, 1 deletions

diff --git a/src/mesa/shader/slang/slang_codegen.c b/src/mesa/shader/slang/slang_codegen.c
index d368009ca50..a44e42b6d6d 100644
--- a/src/mesa/shader/slang/slang_codegen.c
+++ b/src/mesa/shader/slang/slang_codegen.c
@@ -282,6 +282,8 @@ sampler_to_texture_index(const slang_type_specifier_type type)
 }
 
 
+#define SWIZZLE_ZWWW MAKE_SWIZZLE4(SWIZZLE_Z, SWIZZLE_W, SWIZZLE_W, SWIZZLE_W)
+
 /**
  * Return the VERT_ATTRIB_* or FRAG_ATTRIB_* value that corresponds to
  * a vertex or fragment program input variable.  Return -1 if the input
@@ -316,9 +318,11 @@ _slang_input_index(const char *name, GLenum target, GLuint *swizzleOut)
       { "gl_FragCoord", FRAG_ATTRIB_WPOS, SWIZZLE_NOOP },
       { "gl_Color", FRAG_ATTRIB_COL0, SWIZZLE_NOOP },
       { "gl_SecondaryColor", FRAG_ATTRIB_COL1, SWIZZLE_NOOP },
-      { "gl_FogFragCoord", FRAG_ATTRIB_FOGC, SWIZZLE_XXXX },
       { "gl_TexCoord", FRAG_ATTRIB_TEX0, SWIZZLE_NOOP },
+      /* note: we're packing several quantities into the fogcoord vector */
+      { "gl_FogFragCoord", FRAG_ATTRIB_FOGC, SWIZZLE_XXXX },
       { "gl_FrontFacing", FRAG_ATTRIB_FOGC, SWIZZLE_YYYY }, /*XXX*/
+      { "gl_PointCoord", FRAG_ATTRIB_FOGC, SWIZZLE_ZWWW },
       { NULL, 0, SWIZZLE_NOOP }
    };
    GLuint i;
diff --git a/src/mesa/shader/slang/slang_compile.c b/src/mesa/shader/slang/slang_compile.c
index 4e29e8dcc90..2be89a5ce05 100644
--- a/src/mesa/shader/slang/slang_compile.c
+++ b/src/mesa/shader/slang/slang_compile.c
@@ -1983,6 +1983,10 @@ static const byte slang_120_core_gc[] = {
 #include "library/slang_120_core_gc.h"
 };
 
+static const byte slang_120_fragment_gc[] = {
+#include "library/slang_builtin_120_fragment_gc.h"
+};
+
 static const byte slang_common_builtin_gc[] = {
 #include "library/slang_common_builtin_gc.h"
 };
@@ -2059,6 +2063,13 @@ compile_object(grammar * id, const char *source, slang_code_object * object,
                              SLANG_UNIT_FRAGMENT_BUILTIN, infolog, NULL,
                              &object->builtin[SLANG_BUILTIN_COMMON], NULL))
             return GL_FALSE;
+#if FEATURE_ARB_shading_language_120
+         if (!compile_binary(slang_120_fragment_gc,
+                             &object->builtin[SLANG_BUILTIN_TARGET],
+                             SLANG_UNIT_FRAGMENT_BUILTIN, infolog, NULL,
+                             &object->builtin[SLANG_BUILTIN_COMMON], NULL))
+            return GL_FALSE;
+#endif
       }
       else if (type == SLANG_UNIT_VERTEX_SHADER) {
          if (!compile_binary(slang_vertex_builtin_gc,