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-rw-r--r--src/mesa/program/ir_to_mesa.cpp27
1 files changed, 23 insertions, 4 deletions
diff --git a/src/mesa/program/ir_to_mesa.cpp b/src/mesa/program/ir_to_mesa.cpp
index 60d498bd9e3..1bd9a2eee1b 100644
--- a/src/mesa/program/ir_to_mesa.cpp
+++ b/src/mesa/program/ir_to_mesa.cpp
@@ -1256,12 +1256,31 @@ ir_to_mesa_visitor::visit(ir_expression *ir)
}
break;
- case ir_unop_any:
+ case ir_unop_any: {
assert(ir->operands[0]->type->is_vector());
- emit_dp(ir, result_dst, op[0], op[0],
- ir->operands[0]->type->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, op[0], op[0],
+ ir->operands[0]->type->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
+ * is 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));
+ }
break;
+ }
case ir_binop_logic_xor:
emit(ir, OPCODE_SNE, result_dst, op[0], op[1]);