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ir_constant_expression: Add support for the "smoothstep" builtin.

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This commit is contained in:
Kenneth Graunke
2010-07-21 22:37:50 -07:00
parent a4ca1cfb66
commit 546f3a2754
1 changed files with 15 additions and 1 deletions
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16
src/glsl/ir_constant_expression.cpp
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@@ -1064,7 +1064,21 @@ ir_call::constant_expression_value()
for (unsigned c = 0; c < op[0]->type->components(); c++)
data.f[c] = sinhf(op[0]->value.f[c]);
} else if (strcmp(callee, "smoothstep") == 0) {
return NULL; /* FINISHME: implement this */
assert(num_parameters == 3);
assert(op[1]->type == op[0]->type);
unsigned edge_inc = op[0]->type->is_scalar() ? 0 : 1;
for (unsigned c = 0, e = 0; c < type->components(); e += edge_inc, c++) {
const float edge0 = op[0]->value.f[e];
const float edge1 = op[1]->value.f[e];
if (edge0 == edge1) {
data.f[c] = 0.0; /* Avoid a crash - results are undefined anyway */
} else {
const float numerator = op[2]->value.f[c] - edge0;
const float denominator = edge1 - edge0;
const float t = CLAMP(numerator/denominator, 0, 1);
data.f[c] = t * t * (3 - 2 * t);
}
}
} else if (strcmp(callee, "sqrt") == 0) {
expr = new(mem_ctx) ir_expression(ir_unop_sqrt, type, op[0], NULL);
} else if (strcmp(callee, "step") == 0) {