[Mesa-dev] [PATCH 06/10] mesa: support inactive uniforms in glUniform* functions

[Tapani Pälli]

Support inactive uniforms that have explicit location set in
glUniform* functions.

Signed-off-by: Tapani Pälli <tapani.palli at intel.com>
---
 src/mesa/main/uniform_query.cpp | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/src/mesa/main/uniform_query.cpp b/src/mesa/main/uniform_query.cpp
index 5f1af08..e33800a 100644
--- a/src/mesa/main/uniform_query.cpp
+++ b/src/mesa/main/uniform_query.cpp
@@ -253,6 +253,21 @@ validate_uniform_parameters(struct gl_context *ctx,
       return false;
    }
 
+   /* If the driver storage pointer in remap table is -1, we ignore silently.
+    *
+    * GL_ARB_explicit_uniform_location spec says:
+    *     "What happens if Uniform* is called with an explicitly defined
+    *     uniform location, but that uniform is deemed inactive by the
+    *     linker?
+    *
+    *     RESOLVED: The call is ignored for inactive uniform variables and
+    *     no error is generated."
+    *
+    */
+   if (ctx->Extensions.ARB_explicit_uniform_location &&
+      shProg->UniformRemapTable[location] == (gl_uniform_storage *) -1)
+      return false;
+
    _mesa_uniform_split_location_offset(shProg, location, loc, array_index);
 
    if (shProg->UniformStorage[*loc].array_elements == 0 && count > 1) {
-- 
1.9.0