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ir_constant_expression: Add support for the "step" builtin.

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This commit is contained in:
Kenneth Graunke
2010-07-21 21:53:40 -07:00
parent 3d5c2f0adb
commit ff58b7c9b6
1 changed files with 5 additions and 1 deletions
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6
src/glsl/ir_constant_expression.cpp
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@@ -1045,7 +1045,11 @@ ir_call::constant_expression_value()
} 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) {
return NULL; /* FINISHME: implement this */
assert(op[0]->type->is_float() && op[1]->type->is_float());
/* op[0] (edge) may be either a scalar or a vector */
const unsigned c0_inc = op[0]->type->is_scalar() ? 0 : 1;
for (unsigned c = 0, c0 = 0; c < type->components(); c0 += c0_inc, c++)
data.f[c] = (op[1]->value.f[c] < op[0]->value.f[c0]) ? 0.0 : 1.0;
} else if (strcmp(callee, "tan") == 0) {
assert(op[0]->type->is_float());
for (unsigned c = 0; c < op[0]->type->components(); c++)