i965: avoid unnecessary calls to brw_wm_is_glsl()

This function scans the shader to see if it has any GLSL features like
conditionals and loops.  Calling this during state validation is expensive.
Just call it when the shader is given to the driver and save the result.

There's some new/temporary assertions to be sure we don't get out of sync
on this.

4 files changed, 12 insertions, 2 deletions

diff --git a/src/mesa/drivers/dri/i965/brw_context.h b/src/mesa/drivers/dri/i965/brw_context.h
index 2e2eaf5721..af904ee6d6 100644
--- a/src/mesa/drivers/dri/i965/brw_context.h
+++ b/src/mesa/drivers/dri/i965/brw_context.h
@@ -164,6 +164,7 @@ struct brw_vertex_program {
 struct brw_fragment_program {
    struct gl_fragment_program program;
    GLuint id;  /**< serial no. to identify frag progs, never re-used */
+   GLboolean isGLSL;  /**< really, any IF/LOOP/CONT/BREAK instructions */
 };
 
 
diff --git a/src/mesa/drivers/dri/i965/brw_program.c b/src/mesa/drivers/dri/i965/brw_program.c
index 774180c28c..2894cce3d6 100644
--- a/src/mesa/drivers/dri/i965/brw_program.c
+++ b/src/mesa/drivers/dri/i965/brw_program.c
@@ -38,6 +38,7 @@
 
 #include "brw_context.h"
 #include "brw_util.h"
+#include "brw_wm.h"
 
 static void brwBindProgram( GLcontext *ctx,
 			    GLenum target, 
@@ -122,6 +123,7 @@ static void brwProgramStringNotify( GLcontext *ctx,
       if (newFP == curFP)
 	 brw->state.dirty.brw |= BRW_NEW_FRAGMENT_PROGRAM;
       newFP->id = brw->program_id++;      
+      newFP->isGLSL = brw_wm_is_glsl(fprog);
    }
    else if (target == GL_VERTEX_PROGRAM_ARB) {
       struct brw_vertex_program *newVP = (struct brw_vertex_program *) prog;
diff --git a/src/mesa/drivers/dri/i965/brw_wm.c b/src/mesa/drivers/dri/i965/brw_wm.c
index 879000644b..1645ca0b70 100644
--- a/src/mesa/drivers/dri/i965/brw_wm.c
+++ b/src/mesa/drivers/dri/i965/brw_wm.c
@@ -149,11 +149,14 @@ static void do_wm_prog( struct brw_context *brw,
 
    brw_init_compile(brw, &c->func);
 
+   /* temporary sanity check assertion */
+   ASSERT(fp->isGLSL == brw_wm_is_glsl(&c->fp->program));
+
    /*
     * Shader which use GLSL features such as flow control are handled
     * differently from "simple" shaders.
     */
-   if (brw_wm_is_glsl(&c->fp->program)) {
+   if (fp->isGLSL) {
       brw_wm_glsl_emit(brw, c);
    }
    else {
diff --git a/src/mesa/drivers/dri/i965/brw_wm_state.c b/src/mesa/drivers/dri/i965/brw_wm_state.c
index f7ea756fb0..63fc8a004f 100644
--- a/src/mesa/drivers/dri/i965/brw_wm_state.c
+++ b/src/mesa/drivers/dri/i965/brw_wm_state.c
@@ -62,6 +62,7 @@ wm_unit_populate_key(struct brw_context *brw, struct brw_wm_unit_key *key)
 {
    GLcontext *ctx = &brw->intel.ctx;
    const struct gl_fragment_program *fp = brw->fragment_program;
+   const struct brw_fragment_program *bfp = (struct brw_fragment_program *) fp;
    struct intel_context *intel = &brw->intel;
 
    memset(key, 0, sizeof(*key));
@@ -107,7 +108,10 @@ wm_unit_populate_key(struct brw_context *brw, struct brw_wm_unit_key *key)
 
    /* _NEW_COLOR */
    key->uses_kill = fp->UsesKill || ctx->Color.AlphaEnabled;
-   key->is_glsl = brw_wm_is_glsl(fp);
+   key->is_glsl = bfp->isGLSL;
+
+   /* temporary sanity check assertion */
+   ASSERT(bfp->isGLSL == brw_wm_is_glsl(fp));
 
    /* XXX: This needs a flag to indicate when it changes. */
    key->stats_wm = intel->stats_wm;