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-rw-r--r--src/gallium/state_trackers/nine/nine_shader.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/src/gallium/state_trackers/nine/nine_shader.c b/src/gallium/state_trackers/nine/nine_shader.c
index 4ad5fa1723d..4698fd77e97 100644
--- a/src/gallium/state_trackers/nine/nine_shader.c
+++ b/src/gallium/state_trackers/nine/nine_shader.c
@@ -2054,6 +2054,11 @@ DECL_SPECIAL(DCL)
assert(sem.reg.idx < ARRAY_SIZE(tx->regs.v));
if (tgsi.Name == TGSI_SEMANTIC_POSITION) {
+ /* Position0/PositionT0 are forbidden (likely because vPos already does that) */
+ if (sem.usage == D3DDECLUSAGE_POSITION ||
+ sem.usage == D3DDECLUSAGE_POSITIONT)
+ return D3DERR_INVALIDCALL;
+ /* Following code is for depth */
tx->regs.v[sem.reg.idx] = nine_get_position_input(tx);
return D3D_OK;
}