glsl: Fix uniform buffer object counting.

We were counting uniforms located in UBOs against the default uniform
block limit, while not doing any counting against the specific combined
limit.

Note that I couldn't quite find justification for the way I did this, but
I think it's the only sensible thing: The spec talks about components, so
each "float" in a std140 block would count as 1 component and a "vec4"
would count as 4, though they occupy the same amount of space.  Since GPU
limits on uniform buffer loads are surely going to be about the size of
the blocks, I just counted them that way.

Fixes link failures in piglit
arb_uniform_buffer_object/maxuniformblocksize when ported to geometry
shaders on Paul's GS branch, since in that case the max block size is
bigger than the default uniform block component limit.

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

1 files changed, 23 insertions, 2 deletions

diff --git a/src/glsl/linker.cpp b/src/glsl/linker.cpp
index 982fe46bd73..cd8d680aec4 100644
--- a/src/glsl/linker.cpp
+++ b/src/glsl/linker.cpp
@@ -1523,12 +1523,18 @@ check_resources(struct gl_context *ctx, struct gl_shader_program *prog)
       ctx->Const.GeometryProgram.MaxTextureImageUnits
    };
 
-   const unsigned max_uniform_components[MESA_SHADER_TYPES] = {
+   const unsigned max_default_uniform_components[MESA_SHADER_TYPES] = {
       ctx->Const.VertexProgram.MaxUniformComponents,
       ctx->Const.FragmentProgram.MaxUniformComponents,
       ctx->Const.GeometryProgram.MaxUniformComponents
    };
 
+   const unsigned max_combined_uniform_components[MESA_SHADER_TYPES] = {
+      ctx->Const.VertexProgram.MaxCombinedUniformComponents,
+      ctx->Const.FragmentProgram.MaxCombinedUniformComponents,
+      ctx->Const.GeometryProgram.MaxCombinedUniformComponents
+   };
+
    const unsigned max_uniform_blocks[MESA_SHADER_TYPES] = {
       ctx->Const.VertexProgram.MaxUniformBlocks,
       ctx->Const.FragmentProgram.MaxUniformBlocks,
@@ -1546,7 +1552,22 @@ check_resources(struct gl_context *ctx, struct gl_shader_program *prog)
 		      shader_names[i]);
       }
 
-      if (sh->num_uniform_components > max_uniform_components[i]) {
+      if (sh->num_uniform_components > max_default_uniform_components[i]) {
+         if (ctx->Const.GLSLSkipStrictMaxUniformLimitCheck) {
+            linker_warning(prog, "Too many %s shader default uniform block "
+                           "components, but the driver will try to optimize "
+                           "them out; this is non-portable out-of-spec "
+			   "behavior\n",
+                           shader_names[i]);
+         } else {
+            linker_error(prog, "Too many %s shader default uniform block "
+			 "components",
+                         shader_names[i]);
+         }
+      }
+
+      if (sh->num_combined_uniform_components >
+	  max_combined_uniform_components[i]) {
          if (ctx->Const.GLSLSkipStrictMaxUniformLimitCheck) {
             linker_warning(prog, "Too many %s shader uniform components, "
                            "but the driver will try to optimize them out; "