[Mesa-dev] [PATCH 17/70] mesa: optimise interleaved sso validation

[Timothy Arceri]

Now that we have a linked_stages bitfield we can use this
to check if the program is used at a later stage.

This change is also required to be able to use gl_program
rather than gl_shader_program in the CurrentProgram array.
---
 src/mesa/main/pipelineobj.c | 17 +++++++----------
 1 file changed, 7 insertions(+), 10 deletions(-)

diff --git a/src/mesa/main/pipelineobj.c b/src/mesa/main/pipelineobj.c
index 69a07c2..85d970b 100644
--- a/src/mesa/main/pipelineobj.c
+++ b/src/mesa/main/pipelineobj.c
@@ -729,30 +729,27 @@ program_stages_all_active(struct gl_pipeline_object *pipe,
 static bool
 program_stages_interleaved_illegally(const struct gl_pipeline_object *pipe)
 {
-   struct gl_shader_program *prev = NULL;
-   unsigned i, j;
+   unsigned prev_linked_stages = 0;
 
    /* Look for programs bound to stages: A -> B -> A, with any intervening
     * sequence of unrelated programs or empty stages.
     */
-   for (i = 0; i < MESA_SHADER_STAGES; i++) {
+   for (unsigned i = 0; i < MESA_SHADER_STAGES; i++) {
       struct gl_shader_program *cur = pipe->CurrentProgram[i];
 
       /* Empty stages anywhere in the pipe are OK */
-      if (!cur || cur == prev)
+      if (!cur || cur->data->linked_stages == prev_linked_stages)
          continue;
 
-      if (prev) {
+      if (prev_linked_stages) {
          /* We've seen an A -> B transition; look at the rest of the pipe
           * to see if we ever see A again.
           */
-         for (j = i + 1; j < MESA_SHADER_STAGES; j++) {
-            if (pipe->CurrentProgram[j] == prev)
-               return true;
-         }
+         if (prev_linked_stages >> (i + 1))
+            return true;
       }
 
-      prev = cur;
+      prev_linked_stages = cur->data->linked_stages;
    }
 
    return false;
-- 
2.7.4