Module: Mesa
Branch: 9.1
Commit: 5baa8ec737e82bbfec1561b4018bae9804d708fd
URL:
http://cgit.freedesktop.org/mesa/mesa/commit/?id=5baa8ec737e82bbfec1561b4018bae9804d708fd
Author: Michel Dänzer <michel.daen...@amd.com>
Date: Wed Feb 13 15:57:23 2013 +0100
radeonsi: Fix w component of TGSI_SEMANTIC_POSITION fragment shader inputs.
It's the reciprocal of the register value.
Fixes piglit fragcoord_w and glsl-fs-fragcoord-zw-perspective.
NOTE: This is a candidate for the 9.1 branch.
(cherry picked from commit 954bc4ac34b821cdc4ecb3ea8e394a66bcc2dda0)
---
src/gallium/drivers/radeonsi/radeonsi_shader.c | 8 ++++++++
1 files changed, 8 insertions(+), 0 deletions(-)
diff --git a/src/gallium/drivers/radeonsi/radeonsi_shader.c
b/src/gallium/drivers/radeonsi/radeonsi_shader.c
index 7c57f4c..2545634 100644
--- a/src/gallium/drivers/radeonsi/radeonsi_shader.c
+++ b/src/gallium/drivers/radeonsi/radeonsi_shader.c
@@ -263,6 +263,14 @@ static void declare_input_fs(
build_intrinsic(base->gallivm->builder,
"llvm.SI.fs.read.pos", input_type,
args, 1, LLVMReadNoneAttribute);
+
+ if (chan == 3)
+ /* RCP for fragcoord.w */
+ si_shader_ctx->radeon_bld.inputs[soa_index] =
+ LLVMBuildFDiv(gallivm->builder,
+
lp_build_const_float(gallivm, 1.0f),
+
si_shader_ctx->radeon_bld.inputs[soa_index],
+ "");
}
return;
}
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