glsl: Handle the binding qualifier for UBO variables.

layout(binding = N) is equivalent to calling glUniformBlockBinding(_,N).

This currently only handles the GLSL 1.40 case - no interface names, no
arrays of uniform blocks.  This is okay since we don't yet support GLSL
1.50, and don't expose ARB_shading_language_420pack in ES 3.0.

v2: Move into the other function; use binding, not constant_value.

Signed-off-by: Kenneth Graunke <kenneth@whitecape.org>
Acked-by: Paul Berry <stereotype441@gmail.com>

1 files changed, 10 insertions, 0 deletions

diff --git a/src/glsl/link_uniform_initializers.cpp b/src/glsl/link_uniform_initializers.cpp
index 1b7609a4725..3f667104759 100644
--- a/src/glsl/link_uniform_initializers.cpp
+++ b/src/glsl/link_uniform_initializers.cpp
@@ -116,6 +116,16 @@ set_uniform_binding(void *mem_ctx, gl_shader_program *prog,
             }
          }
       }
+   } else if (storage->block_index != -1) {
+      /* This is a field of a UBO.  val is the binding index. */
+      for (int i = 0; i < MESA_SHADER_TYPES; i++) {
+         int stage_index = prog->UniformBlockStageIndex[i][storage->block_index];
+
+         if (stage_index != -1) {
+            struct gl_shader *sh = prog->_LinkedShaders[i];
+            sh->UniformBlocks[stage_index].Binding = binding;
+         }
+      }
    }
 
    storage->initialized = true;