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llvmpipe: make the front-face behavior match the gallium spec

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The spec says that front-face is true if the value is >0 and false
if it's <0. To make sure that we follow the spec, lets just
subtract 0.5 from our value (llvmpipe did 1 for frontface and 0
otherwise), which will get us a positive num for frontface and
negative for backface.

Signed-off-by: Zack Rusin <zackr@vmware.com>
Reviewed-by: Roland Scheidegger <sroland@vmware.com>
Reviewed-by: Jose Fonseca <jfonseca@vmware.com>
This commit is contained in:
Zack Rusin 2013-08-02 15:50:16 -04:00
parent 4f83956347
commit 2d15f4746b
1 changed files with 4 additions and 1 deletions
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5
src/gallium/drivers/llvmpipe/lp_state_setup.c
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@ -182,7 +182,10 @@ emit_facing_coef(struct gallivm_state *gallivm,
LLVMValueRef a0_0 = args->facing;
LLVMValueRef a0_0f = LLVMBuildSIToFP(builder, a0_0, float_type, "");
LLVMValueRef zero = lp_build_const_float(gallivm, 0.0);
LLVMValueRef a0 = vec4f(gallivm, a0_0f, zero, zero, zero, "facing");
LLVMValueRef face_val = LLVMBuildFSub(builder, a0_0f,
lp_build_const_float(gallivm, 0.5),
"");
LLVMValueRef a0 = vec4f(gallivm, face_val, zero, zero, zero, "facing");
LLVMValueRef zerovec = vec4f_from_scalar(gallivm, zero, "zero");
store_coef(gallivm, args, slot, a0, zerovec, zerovec);