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-rw-r--r--src/mesa/drivers/dri/i965/brw_fs.cpp10
1 files changed, 7 insertions, 3 deletions
diff --git a/src/mesa/drivers/dri/i965/brw_fs.cpp b/src/mesa/drivers/dri/i965/brw_fs.cpp
index 8fd120cb653..66bbdbe80e6 100644
--- a/src/mesa/drivers/dri/i965/brw_fs.cpp
+++ b/src/mesa/drivers/dri/i965/brw_fs.cpp
@@ -661,14 +661,18 @@ fs_visitor::emit_math(fs_opcodes opcode, fs_reg dst, fs_reg src0, fs_reg src1)
assert(opcode == FS_OPCODE_POW);
if (intel->gen >= 6) {
- /* Can't do hstride == 0 args to gen6 math, so expand it out. */
- if (src0.file == UNIFORM) {
+ /* Can't do hstride == 0 args to gen6 math, so expand it out.
+ *
+ * The hardware ignores source modifiers (negate and abs) on math
+ * instructions, so we also move to a temp to set those up.
+ */
+ if (src0.file == UNIFORM || src0.abs || src0.negate) {
fs_reg expanded = fs_reg(this, glsl_type::float_type);
emit(fs_inst(BRW_OPCODE_MOV, expanded, src0));
src0 = expanded;
}
- if (src1.file == UNIFORM) {
+ if (src1.file == UNIFORM || src1.abs || src1.negate) {
fs_reg expanded = fs_reg(this, glsl_type::float_type);
emit(fs_inst(BRW_OPCODE_MOV, expanded, src1));
src1 = expanded;