This actually tries to pack any output with an explicit location we
just let the optimisiation passes clean up the extra assignments if
there was no actual packing done.
---
src/glsl/link_varyings.cpp | 17 +++++++++++++++++
1 file changed, 17 insertions(+)
diff --git a/src/glsl/link_varyings.cpp b/src/glsl/link_varyings.cpp
index dd96c03..2908af7 100644
--- a/src/glsl/link_varyings.cpp
+++ b/src/glsl/link_varyings.cpp
@@ -1849,6 +1849,23 @@ assign_varying_locations(struct gl_context *ctx,
}
if (consumer) {
+ if (consumer->Stage == MESA_SHADER_FRAGMENT) {
+ /* Since we only pack frag shader outputs with an explicit location
+ * we only need to count those inputs.
+ */
+ const uint64_t reserved_slots =
+ reserved_varying_slot(consumer, ir_var_shader_out,
+ FRAG_RESULT_DATA0);
+
+ /* Pack frag outputs with the component layout qualifier */
+ unsigned frag_outs = _mesa_bitcount_64(reserved_slots);
+ if (frag_outs > 0)
+ lower_packed_varyings(mem_ctx, frag_outs,
+ ir_var_shader_out, 0, consumer,
+ FRAG_RESULT_DATA0, true,
+ ctx->Extensions.ARB_enhanced_layouts);
+ }
+
remove_unused_shader_inputs_and_outputs(prog, consumer,
ir_var_shader_in);
lower_packed_varyings(mem_ctx, slots_used, ir_var_shader_in,
--
2.4.3
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