Mesa (master): gallivm: implement TGSI KILP
Brian Paul
brianp at kemper.freedesktop.org
Wed Apr 21 22:34:25 UTC 2010
Module: Mesa
Branch: master
Commit: feffd259da5f2655222a2f26e2e5665a9e28173f
URL: http://cgit.freedesktop.org/mesa/mesa/commit/?id=feffd259da5f2655222a2f26e2e5665a9e28173f
Author: Brian Paul <brianp at vmware.com>
Date: Wed Apr 21 16:27:23 2010 -0600
gallivm: implement TGSI KILP
As in tgsi_exec.c we don't actually rely on condition codes; we do
an unconditional kill. The only predication comes from the execution
mask which applies inside loops/conditionals.
---
src/gallium/auxiliary/gallivm/lp_bld_tgsi_soa.c | 35 +++++++++++++++++++++-
1 files changed, 33 insertions(+), 2 deletions(-)
diff --git a/src/gallium/auxiliary/gallivm/lp_bld_tgsi_soa.c b/src/gallium/auxiliary/gallivm/lp_bld_tgsi_soa.c
index 8901e65..cb5e62e 100644
--- a/src/gallium/auxiliary/gallivm/lp_bld_tgsi_soa.c
+++ b/src/gallium/auxiliary/gallivm/lp_bld_tgsi_soa.c
@@ -576,6 +576,9 @@ emit_tex( struct lp_build_tgsi_soa_context *bld,
}
+/**
+ * Kill fragment if any of the src register values are negative.
+ */
static void
emit_kil(
struct lp_build_tgsi_soa_context *bld,
@@ -606,6 +609,9 @@ emit_kil(
if(terms[chan_index]) {
LLVMValueRef chan_mask;
+ /*
+ * If term < 0 then mask = 0 else mask = ~0.
+ */
chan_mask = lp_build_cmp(&bld->base, PIPE_FUNC_GEQUAL, terms[chan_index], bld->base.zero);
if(mask)
@@ -621,6 +627,32 @@ emit_kil(
/**
+ * Predicated fragment kill.
+ * XXX Actually, we do an unconditional kill (as in tgsi_exec.c).
+ * The only predication is the execution mask which will apply if
+ * we're inside a loop or conditional.
+ */
+static void
+emit_kilp(struct lp_build_tgsi_soa_context *bld,
+ const struct tgsi_full_instruction *inst)
+{
+ LLVMValueRef mask;
+
+ /* For those channels which are "alive", disable fragment shader
+ * execution.
+ */
+ if (bld->exec_mask.has_mask) {
+ mask = LLVMBuildNot(bld->base.builder, bld->exec_mask.exec_mask, "kilp");
+ }
+ else {
+ mask = bld->base.zero;
+ }
+
+ lp_build_mask_update(bld->mask, mask);
+}
+
+
+/**
* Check if inst src/dest regs use indirect addressing into temporary
* register file.
*/
@@ -1179,8 +1211,7 @@ emit_instruction(
case TGSI_OPCODE_KILP:
/* predicated kill */
- /* FIXME */
- return 0;
+ emit_kilp( bld, inst );
break;
case TGSI_OPCODE_KIL:
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