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authorEric Anholt <eric@anholt.net>2010-10-06 11:19:48 -0700
committerEric Anholt <eric@anholt.net>2010-10-06 12:13:08 -0700
commit1fdc8c007ea66b4c9866bf2c679653a005307fa5 (patch)
tree8b3682c246560cf7666f37510ae3a968085b63a0 /src
parenta760b5b509f85991a10400977576afabcedbb3c5 (diff)
i965: Add support for gl_FrontFacing on gen6.
Fixes glsl1-gl_FrontFacing var (2) with new FS.
Diffstat (limited to 'src')
-rw-r--r--src/mesa/drivers/dri/i965/brw_fs.cpp49
1 files changed, 39 insertions, 10 deletions
diff --git a/src/mesa/drivers/dri/i965/brw_fs.cpp b/src/mesa/drivers/dri/i965/brw_fs.cpp
index c5013f0574..1ccf695a59 100644
--- a/src/mesa/drivers/dri/i965/brw_fs.cpp
+++ b/src/mesa/drivers/dri/i965/brw_fs.cpp
@@ -830,16 +830,33 @@ fs_reg *
fs_visitor::emit_frontfacing_interpolation(ir_variable *ir)
{
fs_reg *reg = new(this->mem_ctx) fs_reg(this, ir->type);
- struct brw_reg r1_6ud = retype(brw_vec1_grf(1, 6), BRW_REGISTER_TYPE_UD);
- /* bit 31 is "primitive is back face", so checking < (1 << 31) gives
- * us front face
- */
- fs_inst *inst = emit(fs_inst(BRW_OPCODE_CMP,
- *reg,
- fs_reg(r1_6ud),
- fs_reg(1u << 31)));
- inst->conditional_mod = BRW_CONDITIONAL_L;
- emit(fs_inst(BRW_OPCODE_AND, *reg, *reg, fs_reg(1u)));
+
+ /* The frontfacing comes in as a bit in the thread payload. */
+ if (intel->gen >= 6) {
+ emit(fs_inst(BRW_OPCODE_ASR,
+ *reg,
+ fs_reg(retype(brw_vec1_grf(0, 0), BRW_REGISTER_TYPE_D)),
+ fs_reg(15)));
+ emit(fs_inst(BRW_OPCODE_NOT,
+ *reg,
+ *reg));
+ emit(fs_inst(BRW_OPCODE_AND,
+ *reg,
+ *reg,
+ fs_reg(1)));
+ } else {
+ fs_reg *reg = new(this->mem_ctx) fs_reg(this, ir->type);
+ struct brw_reg r1_6ud = retype(brw_vec1_grf(1, 6), BRW_REGISTER_TYPE_UD);
+ /* bit 31 is "primitive is back face", so checking < (1 << 31) gives
+ * us front face
+ */
+ fs_inst *inst = emit(fs_inst(BRW_OPCODE_CMP,
+ *reg,
+ fs_reg(r1_6ud),
+ fs_reg(1u << 31)));
+ inst->conditional_mod = BRW_CONDITIONAL_L;
+ emit(fs_inst(BRW_OPCODE_AND, *reg, *reg, fs_reg(1u)));
+ }
return reg;
}
@@ -2818,6 +2835,18 @@ fs_visitor::generate_code()
case BRW_OPCODE_XOR:
brw_XOR(p, dst, src[0], src[1]);
break;
+ case BRW_OPCODE_NOT:
+ brw_NOT(p, dst, src[0]);
+ break;
+ case BRW_OPCODE_ASR:
+ brw_ASR(p, dst, src[0], src[1]);
+ break;
+ case BRW_OPCODE_SHR:
+ brw_SHR(p, dst, src[0], src[1]);
+ break;
+ case BRW_OPCODE_SHL:
+ brw_SHL(p, dst, src[0], src[1]);
+ break;
case BRW_OPCODE_CMP:
brw_CMP(p, dst, inst->conditional_mod, src[0], src[1]);