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#include "pipe/p_util.h"
#include "pipe/p_shader_tokens.h"
#include "pipe/tgsi/util/tgsi_parse.h"
//#include "tgsi_build.h"
#include "pipe/tgsi/util/tgsi_util.h"
unsigned
tgsi_util_get_src_register_swizzle(
const struct tgsi_src_register *reg,
unsigned component )
{
switch( component ) {
case 0:
return reg->SwizzleX;
case 1:
return reg->SwizzleY;
case 2:
return reg->SwizzleZ;
case 3:
return reg->SwizzleW;
default:
assert( 0 );
}
return 0;
}
unsigned
tgsi_util_get_src_register_extswizzle(
const struct tgsi_src_register_ext_swz *reg,
unsigned component )
{
switch( component ) {
case 0:
return reg->ExtSwizzleX;
case 1:
return reg->ExtSwizzleY;
case 2:
return reg->ExtSwizzleZ;
case 3:
return reg->ExtSwizzleW;
default:
assert( 0 );
}
return 0;
}
unsigned
tgsi_util_get_full_src_register_extswizzle(
const struct tgsi_full_src_register *reg,
unsigned component )
{
unsigned swizzle;
/*
* First, calculate the extended swizzle for a given channel. This will give
* us either a channel index into the simple swizzle or a constant 1 or 0.
*/
swizzle = tgsi_util_get_src_register_extswizzle(
®->SrcRegisterExtSwz,
component );
assert (TGSI_SWIZZLE_X == TGSI_EXTSWIZZLE_X);
assert (TGSI_SWIZZLE_Y == TGSI_EXTSWIZZLE_Y);
assert (TGSI_SWIZZLE_Z == TGSI_EXTSWIZZLE_Z);
assert (TGSI_SWIZZLE_W == TGSI_EXTSWIZZLE_W);
assert (TGSI_EXTSWIZZLE_ZERO > TGSI_SWIZZLE_W);
assert (TGSI_EXTSWIZZLE_ONE > TGSI_SWIZZLE_W);
/*
* Second, calculate the simple swizzle for the unswizzled channel index.
* Leave the constants intact, they are not affected by the simple swizzle.
*/
if( swizzle <= TGSI_SWIZZLE_W ) {
swizzle = tgsi_util_get_src_register_swizzle(
®->SrcRegister,
component );
}
return swizzle;
}
unsigned
tgsi_util_get_src_register_extnegate(
const struct tgsi_src_register_ext_swz *reg,
unsigned component )
{
switch( component ) {
case 0:
return reg->NegateX;
case 1:
return reg->NegateY;
case 2:
return reg->NegateZ;
case 3:
return reg->NegateW;
default:
assert( 0 );
}
return 0;
}
void
tgsi_util_set_src_register_extnegate(
struct tgsi_src_register_ext_swz *reg,
unsigned negate,
unsigned component )
{
switch( component ) {
case 0:
reg->NegateX = negate;
break;
case 1:
reg->NegateY = negate;
break;
case 2:
reg->NegateZ = negate;
break;
case 3:
reg->NegateW = negate;
break;
default:
assert( 0 );
}
}
unsigned
tgsi_util_get_full_src_register_sign_mode(
const struct tgsi_full_src_register *reg,
unsigned component )
{
unsigned sign_mode;
if( reg->SrcRegisterExtMod.Absolute ) {
/* Consider only the post-abs negation. */
if( reg->SrcRegisterExtMod.Negate ) {
sign_mode = TGSI_UTIL_SIGN_SET;
}
else {
sign_mode = TGSI_UTIL_SIGN_CLEAR;
}
}
else {
/* Accumulate the three negations. */
unsigned negate;
negate = reg->SrcRegister.Negate;
if( tgsi_util_get_src_register_extnegate( ®->SrcRegisterExtSwz, component ) ) {
negate = !negate;
}
if( reg->SrcRegisterExtMod.Negate ) {
negate = !negate;
}
if( negate ) {
sign_mode = TGSI_UTIL_SIGN_TOGGLE;
}
else {
sign_mode = TGSI_UTIL_SIGN_KEEP;
}
}
return sign_mode;
}
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