Mesa (master): radeonsi: Enable whole quad mode for pixel shaders.

[Michel Dänzer]

Module: Mesa
Branch: master
Commit: cfebaf9dbd4839075786eb340a247f41bdcf9fa6
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=cfebaf9dbd4839075786eb340a247f41bdcf9fa6

Author: Michel Dänzer <michel.daenzer at amd.com>
Date:   Fri Aug 31 19:04:08 2012 +0200

radeonsi: Enable whole quad mode for pixel shaders.

Fixes wrong mipmap level being sampled at some triangle edges.

Signed-off-by: Michel Dänzer <michel.daenzer at amd.com>
Reviewed-by: Tom Stellard <thomas.stellard at amd.com>

---

 src/gallium/drivers/radeonsi/radeonsi_shader.c |   12 ++++++++++--
 1 files changed, 10 insertions(+), 2 deletions(-)

diff --git a/src/gallium/drivers/radeonsi/radeonsi_shader.c b/src/gallium/drivers/radeonsi/radeonsi_shader.c
index 8c92149..1c330b5 100644
--- a/src/gallium/drivers/radeonsi/radeonsi_shader.c
+++ b/src/gallium/drivers/radeonsi/radeonsi_shader.c
@@ -75,7 +75,7 @@ struct si_shader_context
 	struct tgsi_token * tokens;
 	struct si_pipe_shader *shader;
 	unsigned type; /* TGSI_PROCESSOR_* specifies the type of shader. */
-/*	unsigned num_inputs; */
+	unsigned ninput_emitted;
 /*	struct list_head inputs; */
 /*	unsigned * input_mappings *//* From TGSI to SI hw */
 /*	struct tgsi_shader_info info;*/
@@ -319,6 +319,14 @@ static void declare_input_fs(
 		return;
 	}
 
+	if (!si_shader_ctx->ninput_emitted++) {
+		/* Enable whole quad mode */
+		lp_build_intrinsic(gallivm->builder,
+				   "llvm.SI.wqm",
+				   LLVMVoidTypeInContext(gallivm->context),
+				   NULL, 0);
+	}
+
 	/* XXX: Could there be more than TGSI_NUM_CHANNELS (4) ? */
 	for (chan = 0; chan < TGSI_NUM_CHANNELS; chan++) {
 		LLVMValueRef args[3];
@@ -689,7 +697,7 @@ int si_pipe_shader_create(
 
 	dump = debug_get_bool_option("RADEON_DUMP_SHADERS", FALSE);
 
-	memset(&si_shader_ctx.radeon_bld, 0, sizeof(si_shader_ctx.radeon_bld));
+	memset(&si_shader_ctx, 0, sizeof(si_shader_ctx));
 	radeon_llvm_context_init(&si_shader_ctx.radeon_bld);
 	bld_base = &si_shader_ctx.radeon_bld.soa.bld_base;