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nir/spirv/glsl450: Add helpers for calculating exp() and log().

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This commit is contained in:
Kenneth Graunke 2015-12-29 15:15:05 -08:00
parent 9c9edd1ce8
commit 0f801752f2
1 changed files with 19 additions and 0 deletions
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19
src/glsl/nir/spirv/vtn_glsl450.c
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@ -41,6 +41,25 @@ build_length(nir_builder *b, nir_ssa_def *vec)
} }
} }
/**
* Return e^x.
*/
static nir_ssa_def *
build_exp(nir_builder *b, nir_ssa_def *x)
{
return nir_fexp2(b, nir_fmul(b, x, nir_imm_float(b, M_LOG2E)));
}
/**
* Return ln(x) - the natural logarithm of x.
*/
static nir_ssa_def *
build_log(nir_builder *b, nir_ssa_def *x)
{
return nir_fmul(b, nir_flog2(b, x), nir_imm_float(b, 1.0 / M_LOG2E));
}
static void static void
handle_glsl450_alu(struct vtn_builder *b, enum GLSLstd450 entrypoint, handle_glsl450_alu(struct vtn_builder *b, enum GLSLstd450 entrypoint,
const uint32_t *w, unsigned count) const uint32_t *w, unsigned count)