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, 5 insertions, 3 deletions

diff --git a/src/mesa/main/shaderobj.c b/src/mesa/main/shaderobj.c
index e0ffa2f289d..b6594cbe6f0 100644
--- a/src/mesa/main/shaderobj.c
+++ b/src/mesa/main/shaderobj.c
@@ -326,10 +326,12 @@ _mesa_free_shader_program_data(struct gl_context *ctx,
    shProg->TransformFeedback.NumVarying = 0;
 
 
-   for (i = 0; i < shProg->_NumLinkedShaders; i++) {
-      ctx->Driver.DeleteShader(ctx, shProg->_LinkedShaders[i]);
+   for (i = 0; i < MESA_SHADER_TYPES; i++) {
+      if (shProg->_LinkedShaders[i] != NULL) {
+	 ctx->Driver.DeleteShader(ctx, shProg->_LinkedShaders[i]);
+	 shProg->_LinkedShaders[i] = NULL;
+      }
    }
-   shProg->_NumLinkedShaders = 0;
 }