mesa: fix temp register allocation problems.

Complex texcombine modes were running out of registers (>32 registers for 8 tex units).

diff --git a/src/mesa/main/texenvprogram.c b/src/mesa/main/texenvprogram.c
index 2bce93eef1dfa062e3c137990a16babcd9dc99c1..f6bbbcfaede7cd64948b456c492d1ea28d6f3b6c 100644 (file)
--- a/src/mesa/main/texenvprogram.c
+++ b/src/mesa/main/texenvprogram.c
@@ -411,6 +411,14 @@ static struct ureg get_tex_temp( struct texenv_fragment_program *p )
 }
 
 
+/** Mark a temp reg as being no longer allocatable. */
+static void reserve_temp( struct texenv_fragment_program *p, struct ureg r )
+{
+   if (r.file == PROGRAM_TEMPORARY)
+      p->temps_output |= (1 << r.idx);
+}
+
+
 static void release_temps(GLcontext *ctx, struct texenv_fragment_program *p )
 {
    GLuint max_temp = ctx->Const.FragmentProgram.MaxTemps;
@@ -504,10 +512,12 @@ emit_op(struct texenv_fragment_program *p,
 
    emit_dst( &inst->DstReg, dest, mask );
 
+#if 0
    /* Accounting for indirection tracking:
     */
    if (dest.file == PROGRAM_TEMPORARY)
       p->temps_output |= 1 << dest.idx;
+#endif
 
    return inst;
 }
@@ -562,6 +572,10 @@ static struct ureg emit_texld( struct texenv_fragment_program *p,
 
    p->program->Base.NumTexInstructions++;
 
+   /* Accounting for indirection tracking:
+    */
+   reserve_temp(p, dest);
+
    /* Is this a texture indirection?
     */
    if ((coord.file == PROGRAM_TEMPORARY &&
@@ -1079,6 +1093,7 @@ create_new_program(GLcontext *ctx, struct state_key *key,
       for (unit = 0 ; unit < ctx->Const.MaxTextureUnits; unit++)
         if (key->enabled_units & (1<<unit)) {
            p.src_previous = emit_texenv( &p, unit );
+            reserve_temp(&p, p.src_previous); /* don't re-use this temp reg */
            release_temps(ctx, &p);     /* release all temps */
         }
    }