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-rw-r--r--src/mesa/state_tracker/st_glsl_to_tgsi.cpp10
1 files changed, 9 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 f4870a1c606..0daf5a14285 100644
--- a/src/mesa/state_tracker/st_glsl_to_tgsi.cpp
+++ b/src/mesa/state_tracker/st_glsl_to_tgsi.cpp
@@ -2897,7 +2897,15 @@ glsl_to_tgsi_visitor::emit_block_mov(ir_assignment *ir, const struct glsl_type *
r->type = type->base_type;
if (cond) {
st_src_reg l_src = st_src_reg(*l);
- l_src.swizzle = swizzle_for_size(type->vector_elements);
+
+ if (l_src.file == PROGRAM_OUTPUT &&
+ this->prog->Target == GL_FRAGMENT_PROGRAM_ARB &&
+ (l_src.index == FRAG_RESULT_DEPTH || l_src.index == FRAG_RESULT_STENCIL)) {
+ /* This is a special case because the source swizzles will be shifted
+ * later to account for the difference between GLSL (where they're
+ * plain floats) and TGSI (where they're Z and Y components). */
+ l_src.swizzle = SWIZZLE_XXXX;
+ }
if (native_integers) {
emit_asm(ir, TGSI_OPCODE_UCMP, *l, *cond,