glsl: Slightly change the semantic of _LinkedShaders

Previously _LinkedShaders was a compact array of the linked shaders
for each shader stage.  Now it is arranged such that each slot,
indexed by the MESA_SHADER_* defines, refers to a specific shader
stage.  As a result, some slots will be NULL.  This makes things a
little more complex in the linker, but it simplifies things in other
places.

As a side effect _NumLinkedShaders is removed.

NOTE: This may be a candidate for the 7.9 branch.  If there are other
patches that get backported to 7.9 that use _LinkedShader, this patch
should be cherry picked also.

1 files changed, 4 insertions, 9 deletions

diff --git a/src/mesa/drivers/dri/i965/brw_wm_state.c b/src/mesa/drivers/dri/i965/brw_wm_state.c
index 8cadedadfd..817adefb0c 100644
--- a/src/mesa/drivers/dri/i965/brw_wm_state.c
+++ b/src/mesa/drivers/dri/i965/brw_wm_state.c
@@ -108,16 +108,11 @@ wm_unit_populate_key(struct brw_context *brw, struct brw_wm_unit_key *key)
     * 8-wide.
     */
    if (ctx->Shader.CurrentProgram) {
-      int i;
+      struct brw_shader *shader = (struct brw_shader *)
+	 ctx->Shader.CurrentProgram->_LinkedShaders[MESA_SHADER_FRAGMENT];
 
-      for (i = 0; i < ctx->Shader.CurrentProgram->_NumLinkedShaders; i++) {
-	 struct brw_shader *shader =
-	    (struct brw_shader *)ctx->Shader.CurrentProgram->_LinkedShaders[i];;
-
-	 if (shader->base.Type == GL_FRAGMENT_SHADER &&
-	     shader->ir != NULL) {
-	    key->is_glsl = GL_TRUE;
-	 }
+      if (shader != NULL && shader->ir != NULL) {
+	 key->is_glsl = GL_TRUE;
       }
    }