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ir_constant_expression: Add support for the "refract" builtin.

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This commit is contained in:
Kenneth Graunke 2010-07-21 20:33:42 -07:00
parent d60b2b03da
commit 04b3643dbf
1 changed files with 11 additions and 1 deletions
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12
src/glsl/ir_constant_expression.cpp
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@ -1018,7 +1018,17 @@ ir_call::constant_expression_value()
for (unsigned c = 0; c < op[0]->type->components(); c++)
data.f[c] = op[0]->value.f[c] - 2 * dot_NI * op[1]->value.f[c];
} else if (strcmp(callee, "refract") == 0) {
return NULL; /* FINISHME: implement this */
const float eta = op[2]->value.f[0];
const float dot_NI = dot(op[1], op[0]);
const float k = 1.0 - eta * eta * (1.0 - dot_NI * dot_NI);
if (k < 0.0) {
return ir_constant::zero(mem_ctx, this->type);
} else {
for (unsigned c = 0; c < type->components(); c++) {
data.f[c] = eta * op[0]->value.f[c] - (eta * dot_NI + sqrtf(k))
* op[1]->value.f[c];
}
}
} else if (strcmp(callee, "sign") == 0) {
expr = new(mem_ctx) ir_expression(ir_unop_sign, type, op[0], NULL);
} else if (strcmp(callee, "sin") == 0) {