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nir/spirv/glsl450: Implement Refract built-in.

This commit is contained in:
Kenneth Graunke 2015-12-29 00:28:42 -08:00
parent 74529a2c50
commit 2ea111664c
1 changed files with 20 additions and 1 deletions
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21
src/glsl/nir/spirv/vtn_glsl450.c
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@ -204,6 +204,26 @@ handle_glsl450_alu(struct vtn_builder *b, enum GLSLstd450 entrypoint,
src[1])));
return;
case GLSLstd450Refract: {
nir_ssa_def *I = src[0];
nir_ssa_def *N = src[1];
nir_ssa_def *eta = src[2];
nir_ssa_def *n_dot_i = nir_fdot(nb, N, I);
nir_ssa_def *one = nir_imm_float(nb, 1.0);
nir_ssa_def *zero = nir_imm_float(nb, 0.0);
/* k = 1.0 - eta * eta * (1.0 - dot(N, I) * dot(N, I)) */
nir_ssa_def *k =
nir_fsub(nb, one, nir_fmul(nb, eta, nir_fmul(nb, eta,
nir_fsub(nb, one, nir_fmul(nb, n_dot_i, n_dot_i)))));
nir_ssa_def *result =
nir_fsub(nb, nir_fmul(nb, eta, I),
nir_fmul(nb, nir_fadd(nb, nir_fmul(nb, eta, n_dot_i),
nir_fsqrt(nb, k)), N));
/* XXX: bcsel, or if statement? */
val->ssa->def = nir_bcsel(nb, nir_flt(nb, k, zero), zero, result);
return;
}
case GLSLstd450Sinh:
/* 0.5 * (e^x - e^(-x)) */
val->ssa->def =
@ -239,7 +259,6 @@ handle_glsl450_alu(struct vtn_builder *b, enum GLSLstd450 entrypoint,
case GLSLstd450Frexp:
case GLSLstd450PackDouble2x32:
case GLSLstd450UnpackDouble2x32:
case GLSLstd450Refract:
case GLSLstd450IMix:
default:
unreachable("Unhandled opcode");