diff options
| -rw-r--r-- | src/mesa/drivers/dri/i965/brw_fs_visitor.cpp | 11 |
1 files changed, 7 insertions, 4 deletions
diff --git a/src/mesa/drivers/dri/i965/brw_fs_visitor.cpp b/src/mesa/drivers/dri/i965/brw_fs_visitor.cpp index dcc84416a3d..ff3d0f74d23 100644 --- a/src/mesa/drivers/dri/i965/brw_fs_visitor.cpp +++ b/src/mesa/drivers/dri/i965/brw_fs_visitor.cpp @@ -224,15 +224,18 @@ fs_visitor::emit_lrp(const fs_reg &dst, const fs_reg &x, const fs_reg &y, !y.is_valid_3src() || !a.is_valid_3src()) { /* We can't use the LRP instruction. Emit x*(1-a) + y*a. */ + fs_reg y_times_a = fs_reg(this, glsl_type::float_type); fs_reg one_minus_a = fs_reg(this, glsl_type::float_type); + fs_reg x_times_one_minus_a = fs_reg(this, glsl_type::float_type); + + emit(MUL(y_times_a, y, a)); fs_reg negative_a = a; negative_a.negate = !a.negate; - emit(ADD(one_minus_a, negative_a, fs_reg(1.0f))); - fs_inst *mul = emit(MUL(reg_null_f, y, a)); - mul->writes_accumulator = true; - emit(MAC(dst, x, one_minus_a)); + emit(MUL(x_times_one_minus_a, x, one_minus_a)); + + emit(ADD(dst, x_times_one_minus_a, y_times_a)); } else { /* The LRP instruction actually does op1 * op0 + op2 * (1 - op0), so * we need to reorder the operands. |