glsl: Add gl_{Max,Min}ProgramTexelOffset built-in constants.

Required by ARB_shading_language_420pack. Note that the 420pack spec
incorrectly specifies their values as (Min, Max) = (-7, 8) when they
should be (-8, 7) as listed in the GLSL 4.30 and ESSL 3.0 specs.

Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>

diff --git a/src/glsl/builtin_variables.cpp b/src/glsl/builtin_variables.cpp
index 4bb361c2e4599d0d36adf6f707d1afc80ea3226b..f4ac20543b8872a9dacda52be6c04cec0e9d41f3 100644 (file)
--- a/src/glsl/builtin_variables.cpp
+++ b/src/glsl/builtin_variables.cpp
@@ -790,6 +790,13 @@ generate_130_uniforms(exec_list *instructions,
                         state->Const.MaxClipPlanes);
    add_builtin_constant(instructions, symtab, "gl_MaxVaryingComponents",
                        state->Const.MaxVaryingFloats);
+
+   if (state->ARB_shading_language_420pack_enable) {
+      add_builtin_constant(instructions, symtab, "gl_MinProgramTexelOffset",
+                           state->Const.MinProgramTexelOffset);
+      add_builtin_constant(instructions, symtab, "gl_MaxProgramTexelOffset",
+                           state->Const.MaxProgramTexelOffset);
+   }
 }