mesa: Add UsesDFdy to struct gl_fragment_program.

The i965 back-end needs to compile dFdy() differently for FBOs and
window system framebuffers, because Y coordinates are flipped between
the two (see commit 82d2596: i965: Compute dFdy() correctly for FBOs).
This boolean will allow it to avoid unnecessarily recompiling shaders
that don't use dFdy().

Reviewed-by: Brian Paul <[email protected]>
Reviewed-by: Kenneth Graunke <[email protected]>
Reviewed-by: Ian Romanick <[email protected]>

1 files changed, 2 insertions, 0 deletions

diff --git a/src/mesa/program/program.c b/src/mesa/program/program.c
index 23138eae85b..15337f4d8aa 100644
--- a/src/mesa/program/program.c
+++ b/src/mesa/program/program.c
@@ -546,6 +546,7 @@ _mesa_clone_program(struct gl_context *ctx, const struct gl_program *prog)
          const struct gl_fragment_program *fp = gl_fragment_program_const(prog);
          struct gl_fragment_program *fpc = gl_fragment_program(clone);
          fpc->UsesKill = fp->UsesKill;
+         fpc->UsesDFdy = fp->UsesDFdy;
          fpc->OriginUpperLeft = fp->OriginUpperLeft;
          fpc->PixelCenterInteger = fp->PixelCenterInteger;
       }
@@ -767,6 +768,7 @@ _mesa_combine_programs(struct gl_context *ctx,
       newFprog = gl_fragment_program(newProg);
 
       newFprog->UsesKill = fprogA->UsesKill || fprogB->UsesKill;
+      newFprog->UsesDFdy = fprogA->UsesDFdy || fprogB->UsesDFdy;
 
       /* We'll do a search and replace for instances
        * of progB_colorFile/progB_colorIndex below...