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ir_constant_expression: Handle several floating point unops.

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Cleans up a bunch of pointless operations in a GStreamer fragment shader.
This commit is contained in:
Eric Anholt
2010-05-12 14:42:21 -07:00
parent 65122e9e80
commit 43ad37aa88
1 changed files with 97 additions and 0 deletions
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ir_constant_expression.cpp
+97
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@@ -34,6 +34,7 @@
*/
#define NULL 0
#include <math.h>
#include "ir.h"
#include "ir_visitor.h"
#include "glsl_types.h"
@@ -168,6 +169,102 @@ ir_constant_visitor::visit(ir_expression *ir)
}
break;
case ir_unop_neg:
type = ir->type;
for (c = 0; c < ir->operands[0]->type->components(); c++) {
switch (type->base_type) {
case GLSL_TYPE_UINT:
u[c] = -op[0]->value.u[c];
break;
case GLSL_TYPE_INT:
i[c] = -op[0]->value.i[c];
break;
case GLSL_TYPE_FLOAT:
f[c] = -op[0]->value.f[c];
break;
default:
assert(0);
}
}
break;
case ir_unop_abs:
assert(op[0]->type->base_type == GLSL_TYPE_FLOAT);
type = ir->type;
for (c = 0; c < ir->operands[0]->type->components(); c++) {
switch (type->base_type) {
case GLSL_TYPE_UINT:
u[c] = op[0]->value.u[c];
break;
case GLSL_TYPE_INT:
i[c] = op[0]->value.i[c];
if (i[c] < 0)
i[c] = -i[c];
break;
case GLSL_TYPE_FLOAT:
f[c] = fabs(op[0]->value.f[c]);
break;
default:
assert(0);
}
}
break;
case ir_unop_rcp:
assert(op[0]->type->base_type == GLSL_TYPE_FLOAT);
type = ir->type;
for (c = 0; c < ir->operands[0]->type->components(); c++) {
switch (type->base_type) {
case GLSL_TYPE_UINT:
if (op[0]->value.u[c] != 0.0)
u[c] = 1 / op[0]->value.u[c];
break;
case GLSL_TYPE_INT:
if (op[0]->value.i[c] != 0.0)
i[c] = 1 / op[0]->value.i[c];
break;
case GLSL_TYPE_FLOAT:
if (op[0]->value.f[c] != 0.0)
f[c] = 1.0 / op[0]->value.f[c];
break;
default:
assert(0);
}
}
break;
case ir_unop_rsq:
assert(op[0]->type->base_type == GLSL_TYPE_FLOAT);
type = ir->type;
for (c = 0; c < ir->operands[0]->type->components(); c++) {
f[c] = 1.0 / sqrtf(op[0]->value.f[c]);
}
break;
case ir_unop_sqrt:
assert(op[0]->type->base_type == GLSL_TYPE_FLOAT);
type = ir->type;
for (c = 0; c < ir->operands[0]->type->components(); c++) {
f[c] = sqrtf(op[0]->value.f[c]);
}
break;
case ir_unop_exp:
assert(op[0]->type->base_type == GLSL_TYPE_FLOAT);
type = ir->type;
for (c = 0; c < ir->operands[0]->type->components(); c++) {
f[c] = expf(op[0]->value.f[c]);
}
break;
case ir_unop_log:
assert(op[0]->type->base_type == GLSL_TYPE_FLOAT);
type = ir->type;
for (c = 0; c < ir->operands[0]->type->components(); c++) {
f[c] = logf(op[0]->value.f[c]);
}
break;
case ir_binop_add:
if (ir->operands[0]->type == ir->operands[1]->type) {
type = ir->operands[0]->type;