Mesa (master): i965/fs: Switch W and 1/W in Sandybridge interpolation setup .
Kenneth Graunke
kwg at kemper.freedesktop.org
Sun Apr 3 02:29:35 UTC 2011
Module: Mesa
Branch: master
Commit: 5d7fefb9afbcc6f1d58a92d07c390e6b912c3b00
URL: http://cgit.freedesktop.org/mesa/mesa/commit/?id=5d7fefb9afbcc6f1d58a92d07c390e6b912c3b00
Author: Kenneth Graunke <kenneth at whitecape.org>
Date: Sun Apr 3 01:39:28 2011 -0700
i965/fs: Switch W and 1/W in Sandybridge interpolation setup.
Various documentation mentions that "W" is handed to the WM stage,
but further digging seems to indicate that they really mean 1/W.
The code here is still unclear, but changing this fixes piglit
test "fragcoord_w" on Sandybridge as well as a Khronos ES2 conformance
test. I also tested 3DMarkMobile ES2.0's taiji and hoverjet demos, as
well as Nexuiz, just to be safe.
NOTE: This is a candidate for the 7.10 branch.
---
src/mesa/drivers/dri/i965/brw_fs.cpp | 8 ++++----
1 files changed, 4 insertions(+), 4 deletions(-)
diff --git a/src/mesa/drivers/dri/i965/brw_fs.cpp b/src/mesa/drivers/dri/i965/brw_fs.cpp
index bea6b18..cada140 100644
--- a/src/mesa/drivers/dri/i965/brw_fs.cpp
+++ b/src/mesa/drivers/dri/i965/brw_fs.cpp
@@ -1989,10 +1989,10 @@ fs_visitor::emit_interpolation_setup_gen6()
emit(BRW_OPCODE_MOV, this->pixel_x, int_pixel_x);
emit(BRW_OPCODE_MOV, this->pixel_y, int_pixel_y);
- this->current_annotation = "compute 1/pos.w";
- this->wpos_w = fs_reg(brw_vec8_grf(c->source_w_reg, 0));
- this->pixel_w = fs_reg(this, glsl_type::float_type);
- emit_math(FS_OPCODE_RCP, this->pixel_w, wpos_w);
+ this->current_annotation = "compute pos.w";
+ this->pixel_w = fs_reg(brw_vec8_grf(c->source_w_reg, 0));
+ this->wpos_w = fs_reg(this, glsl_type::float_type);
+ emit_math(FS_OPCODE_RCP, this->wpos_w, this->pixel_w);
this->delta_x = fs_reg(brw_vec8_grf(2, 0));
this->delta_y = fs_reg(brw_vec8_grf(3, 0));
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