mesa: new _mesa_set_vp_override() function for driver-override of vertex program

Patch provide by Keith.
Used in state tracker by DrawPixels to indicate that the state tracker (driver)
is using its own vertex program.  This prevents the texenvprogram code from
replacing conventional shader inputs with state vars.
Fixes glDraw/CopyPixels regressions.

1 files changed, 26 insertions, 3 deletions

diff --git a/src/mesa/main/state.c b/src/mesa/main/state.c
index b124d48269..a962f1cb41 100644
--- a/src/mesa/main/state.c
+++ b/src/mesa/main/state.c
@@ -1,6 +1,6 @@
 /*
  * Mesa 3-D graphics library
- * Version:  7.1
+ * Version:  7.3
  *
  * Copyright (C) 1999-2008  Brian Paul   All Rights Reserved.
  *
@@ -466,10 +466,12 @@ _mesa_update_state_locked( GLcontext *ctx )
 
    if (ctx->FragmentProgram._MaintainTexEnvProgram) {
       prog_flags |= (_NEW_ARRAY | _NEW_TEXTURE_MATRIX | _NEW_LIGHT |
+                     _NEW_RENDERMODE |
                      _NEW_TEXTURE | _NEW_FOG | _DD_NEW_SEPARATE_SPECULAR);
    }
    if (ctx->VertexProgram._MaintainTnlProgram) {
       prog_flags |= (_NEW_ARRAY | _NEW_TEXTURE | _NEW_TEXTURE_MATRIX |
+                     _NEW_RENDERMODE |
                      _NEW_TRANSFORM | _NEW_POINT |
                      _NEW_FOG | _NEW_LIGHT |
                      _MESA_NEW_NEED_EYE_COORDS);
@@ -509,7 +511,8 @@ _mesa_update_state( GLcontext *ctx )
 
 
 
-/* Want to figure out which fragment program inputs are actually
+/**
+ * Want to figure out which fragment program inputs are actually
  * constant/current values from ctx->Current.  These should be
  * referenced as a tracked state variable rather than a fragment
  * program input, to save the overhead of putting a constant value in
@@ -537,6 +540,26 @@ _mesa_set_varying_vp_inputs( GLcontext *ctx,
    if (ctx->varying_vp_inputs != varying_inputs) {
       ctx->varying_vp_inputs = varying_inputs;
       ctx->NewState |= _NEW_ARRAY;
-      //_mesa_printf("%s %x\n", __FUNCTION__, varying_inputs);
+      /*_mesa_printf("%s %x\n", __FUNCTION__, varying_inputs);*/
+   }
+}
+
+
+/**
+ * Used by drivers to tell core Mesa that the driver is going to
+ * install/ use its own vertex program.  In particular, this will
+ * prevent generated fragment programs from using state vars instead
+ * of ordinary varyings/inputs.
+ */
+void
+_mesa_set_vp_override(GLcontext *ctx, GLboolean flag)
+{
+   if (ctx->VertexProgram._Overriden != flag) {
+      ctx->VertexProgram._Overriden = flag;
+
+      /* Set one of the bits which will trigger fragment program
+       * regeneration:
+       */
+      ctx->NewState |= _NEW_ARRAY; 
    }
 }