mesa: Use a new, more specific hook for shader uniform changes.

Gallium drivers and i965 don't require special notification when
sampler uniforms change.  They simply see the _NEW_TEXTURE and adjust
their indirection tables.  These drivers don't want ProgramStringNotify:
it simply causes pointless recompiles.

Unfortunately, i915 still requires shader recompiles and needs
ProgramStringNotify.  Rather than trying to fix that, simply change the
hook to a new, more specific one: ShaderUniformChange.  On i915, this
translates to ProgramStringNotify; others simply ignore it.

Signed-off-by: Kenneth Graunke <[email protected]>
Reviewed-by: Eric Anholt <[email protected]>

3 files changed, 11 insertions, 2 deletions

diff --git a/src/mesa/main/dd.h b/src/mesa/main/dd.h
index a91e8083f21..e6a1e68cb25 100644
--- a/src/mesa/main/dd.h
+++ b/src/mesa/main/dd.h
@@ -399,6 +399,13 @@ struct dd_function_table {
    GLboolean (*ProgramStringNotify)(struct gl_context *ctx, GLenum target, 
                                     struct gl_program *prog);
 
+   /**
+    * Notify driver that the sampler uniforms for the current program have
+    * changed.  On some drivers, this may require shader recompiles.
+    */
+   void (*SamplerUniformChange)(struct gl_context *ctx, GLenum target,
+                                struct gl_program *prog);
+
    /** Query if program can be loaded onto hardware */
    GLboolean (*IsProgramNative)(struct gl_context *ctx, GLenum target, 
 				struct gl_program *prog);
diff --git a/src/mesa/main/ff_fragment_shader.cpp b/src/mesa/main/ff_fragment_shader.cpp
index f743ce109fd..e850d47dd80 100644
--- a/src/mesa/main/ff_fragment_shader.cpp
+++ b/src/mesa/main/ff_fragment_shader.cpp
@@ -1363,7 +1363,8 @@ create_new_program(struct gl_context *ctx, struct state_key *key)
    _mesa_associate_uniform_storage(ctx, p.shader_program, fp->Parameters);
 
    _mesa_update_shader_textures_used(p.shader_program, fp);
-   (void) ctx->Driver.ProgramStringNotify(ctx, fp->Target, fp);
+   if (ctx->Driver.SamplerUniformChange)
+      ctx->Driver.SamplerUniformChange(ctx, fp->Target, fp);
 
    if (!p.shader_program->LinkStatus)
       _mesa_problem(ctx, "Failed to link fixed function fragment shader: %s\n",
diff --git a/src/mesa/main/uniform_query.cpp b/src/mesa/main/uniform_query.cpp
index 816c2779cf3..bddb8f95e14 100644
--- a/src/mesa/main/uniform_query.cpp
+++ b/src/mesa/main/uniform_query.cpp
@@ -809,7 +809,8 @@ _mesa_uniform(struct gl_context *ctx, struct gl_shader_program *shProg,
 		   sizeof(shProg->SamplerUnits));
 
 	    _mesa_update_shader_textures_used(shProg, prog);
-	    (void) ctx->Driver.ProgramStringNotify(ctx, prog->Target, prog);
+            if (ctx->Driver.SamplerUniformChange)
+	       ctx->Driver.SamplerUniformChange(ctx, prog->Target, prog);
 	 }
       }
    }