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ir_constant_expression: Add support for the "distance" builtin.

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This commit is contained in:
Kenneth Graunke 2010-07-21 18:01:22 -07:00
parent 7bcaa3828f
commit 2eaf31642c
1 changed files with 7 additions and 1 deletions
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8
src/glsl/ir_constant_expression.cpp
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@ -854,7 +854,13 @@ ir_call::constant_expression_value()
for (unsigned c = 0; c < op[0]->type->components(); c++)
data.f[c] = 180.0/M_PI * op[0]->value.f[c];
} else if (strcmp(callee, "distance") == 0) {
return NULL; /* FINISHME: implement this */
assert(op[0]->type->is_float() && op[1]->type->is_float());
float length_squared = 0.0;
for (unsigned c = 0; c < op[0]->type->components(); c++) {
float t = op[0]->value.f[c] - op[1]->value.f[c];
length_squared += t * t;
}
return new(mem_ctx) ir_constant(sqrtf(length_squared));
} else if (strcmp(callee, "dot") == 0) {
expr = new(mem_ctx) ir_expression(ir_binop_dot, type, op[0], op[1]);
} else if (strcmp(callee, "equal") == 0) {