Mesa (master): glsl_to_tgsi: implement ir_binop_all_equal using DP4 w/SGE
Bryan Cain
bryanc at kemper.freedesktop.org
Sat Aug 20 19:20:59 UTC 2011
Module: Mesa
Branch: master
Commit: 9098953ee6e0699e13e35183c817ecf40363d538
URL: http://cgit.freedesktop.org/mesa/mesa/commit/?id=9098953ee6e0699e13e35183c817ecf40363d538
Author: Bryan Cain <bryancain3 at gmail.com>
Date: Sat Aug 20 14:15:03 2011 -0500
glsl_to_tgsi: implement ir_binop_all_equal using DP4 w/SGE
This is a port of commit ba01df11c4d0 to glsl_to_tgsi with integer support
added.
---
src/mesa/state_tracker/st_glsl_to_tgsi.cpp | 20 +++++++++++++++++++-
1 files changed, 19 insertions(+), 1 deletions(-)
diff --git a/src/mesa/state_tracker/st_glsl_to_tgsi.cpp b/src/mesa/state_tracker/st_glsl_to_tgsi.cpp
index b238c26..b211fc6 100644
--- a/src/mesa/state_tracker/st_glsl_to_tgsi.cpp
+++ b/src/mesa/state_tracker/st_glsl_to_tgsi.cpp
@@ -1460,8 +1460,26 @@ glsl_to_tgsi_visitor::visit(ir_expression *ir)
glsl_type::vec4_type);
assert(ir->operands[0]->type->base_type == GLSL_TYPE_FLOAT);
emit(ir, TGSI_OPCODE_SNE, st_dst_reg(temp), op[0], op[1]);
+
+ /* After the dot-product, the value will be an integer on the
+ * range [0,4]. Zero becomes 1.0, and positive values become zero.
+ */
emit_dp(ir, result_dst, temp, temp, vector_elements);
- emit(ir, TGSI_OPCODE_SEQ, result_dst, result_src, st_src_reg_for_float(0.0));
+
+ if (result_dst.type == GLSL_TYPE_FLOAT) {
+ /* Negating the result of the dot-product gives values on the range
+ * [-4, 0]. Zero becomes 1.0, and negative values become zero.
+ * This is achieved using SGE.
+ */
+ st_src_reg sge_src = result_src;
+ sge_src.negate = ~sge_src.negate;
+ emit(ir, TGSI_OPCODE_SGE, result_dst, sge_src, st_src_reg_for_float(0.0));
+ } else {
+ /* The TGSI negate flag doesn't work for integers, so use SEQ 0
+ * instead.
+ */
+ emit(ir, TGSI_OPCODE_SEQ, result_dst, result_src, st_src_reg_for_int(0));
+ }
} else {
emit(ir, TGSI_OPCODE_SEQ, result_dst, op[0], op[1]);
}
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