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, 13 insertions, 3 deletions

diff --git a/src/mesa/program/ir_to_mesa.cpp b/src/mesa/program/ir_to_mesa.cpp
index 524130ca59..bdd3fd92ff 100644
--- a/src/mesa/program/ir_to_mesa.cpp
+++ b/src/mesa/program/ir_to_mesa.cpp
@@ -2238,8 +2238,12 @@ set_uniform_initializers(struct gl_context *ctx,
 {
    void *mem_ctx = NULL;
 
-   for (unsigned int i = 0; i < shader_program->_NumLinkedShaders; i++) {
+   for (unsigned int i = 0; i < MESA_SHADER_TYPES; i++) {
       struct gl_shader *shader = shader_program->_LinkedShaders[i];
+
+      if (shader == NULL)
+	 continue;
+
       foreach_iter(exec_list_iterator, iter, *shader->ir) {
 	 ir_instruction *ir = (ir_instruction *)iter.get();
 	 ir_variable *var = ir->as_variable();
@@ -2467,7 +2471,10 @@ _mesa_ir_link_shader(struct gl_context *ctx, struct gl_shader_program *prog)
 {
    assert(prog->LinkStatus);
 
-   for (unsigned i = 0; i < prog->_NumLinkedShaders; i++) {
+   for (unsigned i = 0; i < MESA_SHADER_TYPES; i++) {
+      if (prog->_LinkedShaders[i] == NULL)
+	 continue;
+
       bool progress;
       exec_list *ir = prog->_LinkedShaders[i]->ir;
       const struct gl_shader_compiler_options *options =
@@ -2511,10 +2518,13 @@ _mesa_ir_link_shader(struct gl_context *ctx, struct gl_shader_program *prog)
       validate_ir_tree(ir);
    }
 
-   for (unsigned i = 0; i < prog->_NumLinkedShaders; i++) {
+   for (unsigned i = 0; i < MESA_SHADER_TYPES; i++) {
       struct gl_program *linked_prog;
       bool ok = true;
 
+      if (prog->_LinkedShaders[i] == NULL)
+	 continue;
+
       linked_prog = get_mesa_program(ctx, prog, prog->_LinkedShaders[i]);
 
       switch (prog->_LinkedShaders[i]->Type) {