glsl: Simplify the built-in function linking code.

Previously, we stored an array of up to 16 additional shaders to link,
as well as a count of how many each shader actually needed.

Since the built-in functions rewrite, all the built-ins are stored in a
single shader.  So all we need is a boolean indicating whether a shader
needs to link against built-ins or not.

During linking, we can avoid creating the temporary array if none of the
shaders being linked need built-ins.  Otherwise, it's simply a copy of
the array that has one additional element.  This is much simpler.

This patch saves approximately 128 bytes of memory per gl_shader object.

Signed-off-by: Kenneth Graunke <[email protected]>
Reviewed-by: Ian Romanick <[email protected]>

1 files changed, 1 insertions, 3 deletions

diff --git a/src/glsl/glsl_parser_extras.h b/src/glsl/glsl_parser_extras.h
index d232bb3f66d..c1f5ff58979 100644
--- a/src/glsl/glsl_parser_extras.h
+++ b/src/glsl/glsl_parser_extras.h
@@ -361,9 +361,7 @@ struct _mesa_glsl_parse_state {
    /** Extensions supported by the OpenGL implementation. */
    const struct gl_extensions *extensions;
 
-   /** Shaders containing built-in functions that are used for linking. */
-   struct gl_shader *builtins_to_link[16];
-   unsigned num_builtins_to_link;
+   bool uses_builtin_functions;
 
    /**
     * For geometry shaders, size of the most recently seen input declaration