mesa/glsl: add bitmask to track stages a program was linked against

This will be used to enable us to store the current gl_program
rather than gl_shader_program in the gl_pipline_object allowing
us to simplify handing of validation.

Also we should not be depending on _LinkedShader for this information
as it may contain shaders from a failed linking attempt rather than
the current program still in use.

We could also use this mask to iterate over the stages during linking
with _mesa_bit_scan() rather then the current method of NULL checking
each stage.

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

1 files changed, 1 insertions, 0 deletions

diff --git a/src/compiler/glsl/linker.cpp b/src/compiler/glsl/linker.cpp
index 6f54f75ae1e..d26517ace29 100644
--- a/src/compiler/glsl/linker.cpp
+++ b/src/compiler/glsl/linker.cpp
@@ -4889,6 +4889,7 @@ link_shaders(struct gl_context *ctx, struct gl_shader_program *prog)
          }
 
          prog->_LinkedShaders[stage] = sh;
+         prog->data->linked_stages |= 1 << stage;
       }
    }