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llvmpipe: Utility functions for linear and bilinear interpolation.

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This commit is contained in:
José Fonseca 2009-09-07 14:27:06 +01:00
parent 4da20234f3
commit fa0f4b35be
2 changed files with 45 additions and 0 deletions
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25
src/gallium/drivers/llvmpipe/lp_bld_arit.c
View file

@ -502,6 +502,31 @@ lp_build_div(struct lp_build_context *bld,
}
LLVMValueRef
lp_build_lerp(struct lp_build_context *bld,
LLVMValueRef x,
LLVMValueRef v0,
LLVMValueRef v1)
{
return lp_build_add(bld, v0, lp_build_mul(bld, x, lp_build_sub(bld, v1, v0)));
}
LLVMValueRef
lp_build_lerp_2d(struct lp_build_context *bld,
LLVMValueRef x,
LLVMValueRef y,
LLVMValueRef v00,
LLVMValueRef v01,
LLVMValueRef v10,
LLVMValueRef v11)
{
LLVMValueRef v0 = lp_build_lerp(bld, x, v00, v01);
LLVMValueRef v1 = lp_build_lerp(bld, x, v10, v11);
return lp_build_lerp(bld, y, v0, v1);
}
/**
* Generate min(a, b)
* Do checks for special cases.

20
src/gallium/drivers/llvmpipe/lp_bld_arit.h
View file

@ -71,6 +71,26 @@ lp_build_div(struct lp_build_context *bld,
LLVMValueRef a,
LLVMValueRef b);
LLVMValueRef
lp_build_lerp(struct lp_build_context *bld,
LLVMValueRef x,
LLVMValueRef v0,
LLVMValueRef v1);
/**
* Bilinear interpolation.
*
* Values indices are in v_{yx}.
*/
LLVMValueRef
lp_build_lerp_2d(struct lp_build_context *bld,
LLVMValueRef x,
LLVMValueRef y,
LLVMValueRef v00,
LLVMValueRef v01,
LLVMValueRef v10,
LLVMValueRef v11);
LLVMValueRef
lp_build_min(struct lp_build_context *bld,
LLVMValueRef a,