From: Ian Romanick <ian.d.roman...@intel.com>
The operation ir_binop_any_nequal is (a.x != b.x) || (a.y != b.y) ||
(a.z != b.z) || (a.w != b.w), and that is the same as any(bvec4(a.x !=
b.x, a.y != b.y, a.z != b.z, a.w != b.w)). Implement the any() part
the same way the regular ir_unop_any is implemented.
---
src/mesa/program/ir_to_mesa.cpp | 22 ++++++++++++++++++++--
1 files changed, 20 insertions(+), 2 deletions(-)
diff --git a/src/mesa/program/ir_to_mesa.cpp b/src/mesa/program/ir_to_mesa.cpp
index 9991333..7599d81 100644
--- a/src/mesa/program/ir_to_mesa.cpp
+++ b/src/mesa/program/ir_to_mesa.cpp
@@ -1249,8 +1249,26 @@ ir_to_mesa_visitor::visit(ir_expression *ir)
ir->operands[1]->type->is_vector()) {
src_reg temp = get_temp(glsl_type::vec4_type);
emit(ir, OPCODE_SNE, dst_reg(temp), op[0], op[1]);
- emit_dp(ir, result_dst, temp, temp, vector_elements);
- emit(ir, OPCODE_SNE, result_dst, result_src, src_reg_for_float(0.0));
+
+ /* After the dot-product, the value will be an integer on the
+ * range [0,4]. Zero stays zero, and positive values become 1.0.
+ */
+ ir_to_mesa_instruction *const dp =
+ emit_dp(ir, result_dst, temp, temp, vector_elements);
+ if (this->prog->Target == GL_FRAGMENT_PROGRAM_ARB) {
+ /* The clamping to [0,1] can be done for free in the fragment
+ * shader with a saturate.
+ */
+ dp->saturate = true;
+ } else {
+ /* Negating the result of the dot-product gives values on the range
+ * [-4, 0]. Zero stays zero, and negative values become 1.0. This
+ * achieved using SLT.
+ */
+ src_reg slt_src = result_src;
+ slt_src.negate = ~slt_src.negate;
+ emit(ir, OPCODE_SLT, result_dst, slt_src, src_reg_for_float(0.0));
+ }
} else {
emit(ir, OPCODE_SNE, result_dst, op[0], op[1]);
}
--
1.7.4.4
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