glsl: Propagate explicit binding information from the AST all the way to the linker

Information about the binding was not being properly communicated from
the front-end compiler to the linker.  As a result, the linker never
knew that any UBOs had explicit bindings!

Fixes the piglit test arb_shading_language_420pack-binding-layout.

Signed-off-by: Ian Romanick <ian.d.romanick@intel.com>
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=76323
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Tested-by: github@socker.lepus.uberspace.de [v0]
Cc: "10.1" <mesa-stable@lists.freedesktop.org>
Cc: github@socker.lepus.uberspace.de

1 files changed, 12 insertions, 2 deletions

diff --git a/src/glsl/link_uniform_blocks.cpp b/src/glsl/link_uniform_blocks.cpp
index 72d6c53..1a0e643 100644
--- a/src/glsl/link_uniform_blocks.cpp
+++ b/src/glsl/link_uniform_blocks.cpp
@@ -251,7 +251,17 @@ link_uniform_blocks(void *mem_ctx,
             blocks[i].Name = ralloc_asprintf(blocks, "%s[%u]", name,
                                              b->array_elements[j]);
             blocks[i].Uniforms = &variables[parcel.index];
-            blocks[i].Binding = 0;
+
+            /* The GL_ARB_shading_language_420pack spec says:
+             *
+             *     "If the binding identifier is used with a uniform block
+             *     instanced as an array then the first element of the array
+             *     takes the specified block binding and each subsequent
+             *     element takes the next consecutive uniform block binding
+             *     point."
+             */
+            blocks[i].Binding = (b->has_binding) ? b->binding + j : 0;
+
             blocks[i].UniformBufferSize = 0;
             blocks[i]._Packing =
                gl_uniform_block_packing(block_type->interface_packing);
@@ -269,7 +279,7 @@ link_uniform_blocks(void *mem_ctx,
       } else {
          blocks[i].Name = ralloc_strdup(blocks, block_type->name);
          blocks[i].Uniforms = &variables[parcel.index];
-         blocks[i].Binding = 0;
+         blocks[i].Binding = (b->has_binding) ? b->binding : 0;
          blocks[i].UniformBufferSize = 0;
          blocks[i]._Packing =
             gl_uniform_block_packing(block_type->interface_packing);