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i965: Make pixel_xy results UW.

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There is a restriction on the destination of an operation involving a
vector immediate being 128-bit aligned and the destination horizontal
stride being equivalent to 2 bytes.  Fixes bad pixel_x results from
gl_FragCoord, where each pair had the same value.
This commit is contained in:
Eric Anholt 2010-09-04 20:54:52 -07:00
parent c47b289972
commit 32b84ef4ca
1 changed files with 2 additions and 0 deletions
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2
src/mesa/drivers/dri/i965/brw_fs.cpp
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@ -1211,6 +1211,8 @@ fs_visitor::emit_interpolation()
this->current_annotation = "compute pixel centers";
this->pixel_x = fs_reg(this, glsl_type::uint_type);
this->pixel_y = fs_reg(this, glsl_type::uint_type);
this->pixel_x.type = BRW_REGISTER_TYPE_UW;
this->pixel_y.type = BRW_REGISTER_TYPE_UW;
emit(fs_inst(BRW_OPCODE_ADD,
this->pixel_x,
fs_reg(stride(suboffset(g1_uw, 4), 2, 4, 0)),