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glsl: Implement constant expr evaluation for bit-shift ops

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Implement by adding the following cases to
ir_expression::constant_expression_value():
    - ir_binop_lshfit
    - ir_binop_rshfit
This commit is contained in:
Chad Versace 2010-10-09 20:56:14 -07:00 • committed by Kenneth Graunke
parent 90a8b792c0
commit adea8150a7
1 changed files with 48 additions and 0 deletions
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48
src/glsl/ir_constant_expression.cpp
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@ -680,6 +680,54 @@ ir_expression::constant_expression_value()
data.b[0] = !op[0]->has_value(op[1]);
break;
case ir_binop_lshift:
for (unsigned c = 0, c0 = 0, c1 = 0;
c < components;
c0 += c0_inc, c1 += c1_inc, c++) {
if (op[0]->type->base_type == GLSL_TYPE_INT &&
op[1]->type->base_type == GLSL_TYPE_INT) {
data.i[c] = op[0]->value.i[c0] << op[1]->value.i[c1];
} else if (op[0]->type->base_type == GLSL_TYPE_INT &&
op[1]->type->base_type == GLSL_TYPE_UINT) {
data.i[c] = op[0]->value.i[c0] << op[1]->value.u[c1];
} else if (op[0]->type->base_type == GLSL_TYPE_UINT &&
op[1]->type->base_type == GLSL_TYPE_INT) {
data.u[c] = op[0]->value.u[c0] << op[1]->value.i[c1];
} else if (op[0]->type->base_type == GLSL_TYPE_UINT &&
op[1]->type->base_type == GLSL_TYPE_UINT) {
data.u[c] = op[0]->value.u[c0] << op[1]->value.u[c1];
}
}
break;
case ir_binop_rshift:
for (unsigned c = 0, c0 = 0, c1 = 0;
c < components;
c0 += c0_inc, c1 += c1_inc, c++) {
if (op[0]->type->base_type == GLSL_TYPE_INT &&
op[1]->type->base_type == GLSL_TYPE_INT) {
data.i[c] = op[0]->value.i[c0] >> op[1]->value.i[c1];
} else if (op[0]->type->base_type == GLSL_TYPE_INT &&
op[1]->type->base_type == GLSL_TYPE_UINT) {
data.i[c] = op[0]->value.i[c0] >> op[1]->value.u[c1];
} else if (op[0]->type->base_type == GLSL_TYPE_UINT &&
op[1]->type->base_type == GLSL_TYPE_INT) {
data.u[c] = op[0]->value.u[c0] >> op[1]->value.i[c1];
} else if (op[0]->type->base_type == GLSL_TYPE_UINT &&
op[1]->type->base_type == GLSL_TYPE_UINT) {
data.u[c] = op[0]->value.u[c0] >> op[1]->value.u[c1];
}
}
break;
default:
/* FINISHME: Should handle all expression types. */
return NULL;