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.
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@ -263,6 +263,14 @@ static void declare_input_fs(
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build_intrinsic(base->gallivm->builder,
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"llvm.SI.fs.read.pos", input_type,
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args, 1, LLVMReadNoneAttribute);
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if (chan == 3)
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/* RCP for fragcoord.w */
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si_shader_ctx->radeon_bld.inputs[soa_index] =
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LLVMBuildFDiv(gallivm->builder,
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lp_build_const_float(gallivm, 1.0f),
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si_shader_ctx->radeon_bld.inputs[soa_index],
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"");
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}
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return;
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}
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