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-rw-r--r--src/mesa/state_tracker/st_glsl_to_tgsi.cpp12
1 files changed, 11 insertions, 1 deletions
diff --git a/src/mesa/state_tracker/st_glsl_to_tgsi.cpp b/src/mesa/state_tracker/st_glsl_to_tgsi.cpp
index 978dc46401b..8a247ea68d7 100644
--- a/src/mesa/state_tracker/st_glsl_to_tgsi.cpp
+++ b/src/mesa/state_tracker/st_glsl_to_tgsi.cpp
@@ -5383,9 +5383,19 @@ src_register(struct st_translate *t, const st_src_reg *reg)
case PROGRAM_TEMPORARY:
case PROGRAM_ARRAY:
- case PROGRAM_OUTPUT:
return ureg_src(dst_register(t, reg->file, reg->index, reg->array_id));
+ case PROGRAM_OUTPUT: {
+ struct ureg_dst dst = dst_register(t, reg->file, reg->index, reg->array_id);
+ assert(dst.WriteMask != 0);
+ unsigned shift = ffs(dst.WriteMask) - 1;
+ return ureg_swizzle(ureg_src(dst),
+ shift,
+ MIN2(shift + 1, 3),
+ MIN2(shift + 2, 3),
+ MIN2(shift + 3, 3));
+ }
+
case PROGRAM_UNIFORM:
assert(reg->index >= 0);
return reg->index < t->num_constants ?