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-rw-r--r--src/mesa/drivers/dri/r300/r300_vertprog.c22
1 files changed, 16 insertions, 6 deletions
diff --git a/src/mesa/drivers/dri/r300/r300_vertprog.c b/src/mesa/drivers/dri/r300/r300_vertprog.c
index 129004fee78..e77cd611f7a 100644
--- a/src/mesa/drivers/dri/r300/r300_vertprog.c
+++ b/src/mesa/drivers/dri/r300/r300_vertprog.c
@@ -263,15 +263,25 @@ static struct r300_vertex_program *build_program(GLcontext *ctx,
rc_move_output(&compiler.Base, VERT_RESULT_PSIZ, VERT_RESULT_PSIZ, WRITEMASK_X);
if (vp->key.WPosAttr != FRAG_ATTRIB_MAX) {
- rc_copy_output(&compiler.Base,
- VERT_RESULT_HPOS,
- vp->key.WPosAttr - FRAG_ATTRIB_TEX0 + VERT_RESULT_TEX0);
+ unsigned int vp_wpos_attr = vp->key.WPosAttr - FRAG_ATTRIB_TEX0 + VERT_RESULT_TEX0;
+
+ /* Set empty writemask for instructions writing to vp_wpos_attr
+ * before moving the wpos attr there.
+ * Such instructions will be removed by DCE.
+ */
+ rc_move_output(&compiler.Base, vp_wpos_attr, vp->key.WPosAttr, 0);
+ rc_copy_output(&compiler.Base, VERT_RESULT_HPOS, vp_wpos_attr);
}
if (vp->key.FogAttr != FRAG_ATTRIB_MAX) {
- rc_move_output(&compiler.Base,
- VERT_RESULT_FOGC,
- vp->key.FogAttr - FRAG_ATTRIB_TEX0 + VERT_RESULT_TEX0, WRITEMASK_X);
+ unsigned int vp_fog_attr = vp->key.FogAttr - FRAG_ATTRIB_TEX0 + VERT_RESULT_TEX0;
+
+ /* Set empty writemask for instructions writing to vp_fog_attr
+ * before moving the fog attr there.
+ * Such instructions will be removed by DCE.
+ */
+ rc_move_output(&compiler.Base, vp_fog_attr, vp->key.FogAttr, 0);
+ rc_move_output(&compiler.Base, VERT_RESULT_FOGC, vp_fog_attr, WRITEMASK_X);
}
r3xx_compile_vertex_program(&compiler);