/**
* Transform the trigonometric functions COS, SIN, and SCS
* so that the input to COS and SIN is always in the range [-PI, PI].
* SCS is replaced by one COS and one SIN instruction.
*/
int r300_transform_trig_scale_vertex(struct radeon_compiler *c,
struct rc_instruction *inst,
void *unused)
{
static const float cons[4] = {0.15915494309189535, 0.5, 6.28318530717959, -3.14159265358979};
unsigned int temp;
unsigned int constant;
if (inst->U.I.Opcode != RC_OPCODE_COS &&
inst->U.I.Opcode != RC_OPCODE_SIN &&
inst->U.I.Opcode != RC_OPCODE_SCS)
return 0;
/* Repeat x in the range [-PI, PI]:
*
* repeat(x) = frac(x / 2PI + 0.5) * 2PI - PI
*/
temp = rc_find_free_temporary(c);
constant = rc_constants_add_immediate_vec4(&c->Program.Constants, cons);
emit3(c, inst->Prev, RC_OPCODE_MAD, 0, dstregtmpmask(temp, RC_MASK_W),
swizzle_xxxx(inst->U.I.SrcReg[0]),
srcregswz(RC_FILE_CONSTANT, constant, RC_SWIZZLE_XXXX),
srcregswz(RC_FILE_CONSTANT, constant, RC_SWIZZLE_YYYY));
emit1(c, inst->Prev, RC_OPCODE_FRC, 0, dstregtmpmask(temp, RC_MASK_W),
srcreg(RC_FILE_TEMPORARY, temp));
emit3(c, inst->Prev, RC_OPCODE_MAD, 0, dstregtmpmask(temp, RC_MASK_W),
srcreg(RC_FILE_TEMPORARY, temp),
srcregswz(RC_FILE_CONSTANT, constant, RC_SWIZZLE_ZZZZ),
srcregswz(RC_FILE_CONSTANT, constant, RC_SWIZZLE_WWWW));
r300_transform_SIN_COS_SCS(c, inst, temp);
return 1;
}
static void sincos_constants(struct radeon_compiler* c, unsigned int *constants)
{
static const float SinCosConsts[2][4] = {
{
1.273239545, /* 4/PI */
-0.405284735, /* -4/(PI*PI) */
3.141592654, /* PI */
0.2225 /* weight */
},
{
0.75,
0.5,
0.159154943, /* 1/(2*PI) */
6.283185307 /* 2*PI */
}
};
int i;
for(i = 0; i < 2; ++i)
constants[i] = rc_constants_add_immediate_vec4(&c->Program.Constants, SinCosConsts[i]);
}
/**
* This function will attempt to rewrite non-native swizzles that read from
* immediate registers by rearranging the immediates to allow the
* instruction to use native swizzles.
*/
static unsigned try_rewrite_constant(struct radeon_compiler *c,
struct rc_src_register *reg)
{
unsigned new_swizzle, chan, swz0, swz1, swz2, swz3, found_swizzle, swz;
unsigned all_inline = 0;
float imms[4] = {0.0f, 0.0f, 0.0f, 0.0f};
if (!rc_src_reg_is_immediate(c, reg->File, reg->Index)) {
/* The register does not contain immediates, but if all
* the swizzles are inline constants, we can still rewrite
* it. */
new_swizzle = RC_SWIZZLE_XYZW;
for (chan = 0 ; chan < 4; chan++) {
unsigned swz = GET_SWZ(reg->Swizzle, chan);
if (swz <= RC_SWIZZLE_W) {
return 0;
}
if (swz == RC_SWIZZLE_UNUSED) {
SET_SWZ(new_swizzle, chan, RC_SWIZZLE_UNUSED);
}
}
all_inline = 1;
} else {
new_swizzle = reg->Swizzle;
}
swz = RC_SWIZZLE_UNUSED;
found_swizzle = 1;
/* Check if all channels have the same swizzle. If they do we can skip
* the search for a native swizzle. We only need to check the first
* three channels, because any swizzle is legal in the fourth channel.
*/
for (chan = 0; chan < 3; chan++) {
unsigned chan_swz = GET_SWZ(reg->Swizzle, chan);
if (chan_swz == RC_SWIZZLE_UNUSED) {
continue;
}
if (swz == RC_SWIZZLE_UNUSED) {
swz = chan_swz;
} else if (swz != chan_swz) {
found_swizzle = 0;
break;
}
}
/* Find a legal swizzle */
/* This loop attempts to find a native swizzle where all the
* channels are different. */
while (!found_swizzle && !all_inline) {
swz0 = GET_SWZ(new_swizzle, 0);
swz1 = GET_SWZ(new_swizzle, 1);
swz2 = GET_SWZ(new_swizzle, 2);
/* Swizzle .W. is never legal. */
if (swz1 == RC_SWIZZLE_W ||
swz1 == RC_SWIZZLE_UNUSED ||
swz1 == RC_SWIZZLE_ZERO ||
swz1 == RC_SWIZZLE_HALF ||
swz1 == RC_SWIZZLE_ONE) {
/* We chose Z, because there are two non-repeating
* swizzle combinations of the form .Z. There are
* only one combination each for .X. and .Y. */
SET_SWZ(new_swizzle, 1, RC_SWIZZLE_Z);
continue;
}
if (swz2 == RC_SWIZZLE_UNUSED) {
/* We choose Y, because there are two non-repeating
* swizzle combinations of the form ..Y */
SET_SWZ(new_swizzle, 2, RC_SWIZZLE_Y);
continue;
}
switch (swz0) {
/* X.. */
case RC_SWIZZLE_X:
/* Legal swizzles that start with X: XYZ, XXX */
switch (swz1) {
/* XX. */
case RC_SWIZZLE_X:
/* The new swizzle will be:
* ZXY (XX. => ZX. => ZXY) */
SET_SWZ(new_swizzle, 0, RC_SWIZZLE_Z);
break;
/* XY. */
case RC_SWIZZLE_Y:
/* The new swizzle is XYZ */
SET_SWZ(new_swizzle, 2, RC_SWIZZLE_Z);
found_swizzle = 1;
break;
/* XZ. */
case RC_SWIZZLE_Z:
/* XZZ */
if (swz2 == RC_SWIZZLE_Z) {
/* The new swizzle is XYZ */
SET_SWZ(new_swizzle, 1, RC_SWIZZLE_Y);
found_swizzle = 1;
} else { /* XZ[^Z] */
/* The new swizzle will be:
* YZX (XZ. => YZ. => YZX) */
SET_SWZ(new_swizzle, 0, RC_SWIZZLE_Y);
}
break;
/* XW. Should have already been handled. */
case RC_SWIZZLE_W:
assert(0);
break;
}
break;
/* Y.. */
case RC_SWIZZLE_Y:
/* Legal swizzles that start with Y: YYY, YZX */
switch (swz1) {
/* YY. */
case RC_SWIZZLE_Y:
/* The new swizzle will be:
* XYZ (YY. => XY. => XYZ) */
SET_SWZ(new_swizzle, 0, RC_SWIZZLE_X);
break;
/* YZ. */
case RC_SWIZZLE_Z:
/* The new swizzle is YZX */
SET_SWZ(new_swizzle, 2, RC_SWIZZLE_X);
found_swizzle = 1;
break;
/* YX. */
case RC_SWIZZLE_X:
/* YXX */
if (swz2 == RC_SWIZZLE_X) {
/*The new swizzle is YZX */
SET_SWZ(new_swizzle, 1, RC_SWIZZLE_Z);
found_swizzle = 1;
} else { /* YX[^X] */
/* The new swizzle will be:
* ZXY (YX. => ZX. -> ZXY) */
SET_SWZ(new_swizzle, 0, RC_SWIZZLE_Z);
}
break;
/* YW. Should have already been handled. */
case RC_SWIZZLE_W:
assert(0);
break;
}
break;
/* Z.. */
case RC_SWIZZLE_Z:
/* Legal swizzles that start with Z: ZZZ, ZXY */
switch (swz1) {
/* ZZ. */
case RC_SWIZZLE_Z:
/* The new swizzle will be:
* WZY (ZZ. => WZ. => WZY) */
SET_SWZ(new_swizzle, 0, RC_SWIZZLE_W);
break;
/* ZX. */
case RC_SWIZZLE_X:
/* The new swizzle is ZXY */
SET_SWZ(new_swizzle, 2, RC_SWIZZLE_Y);
found_swizzle = 1;
break;
/* ZY. */
case RC_SWIZZLE_Y:
/* ZYY */
if (swz2 == RC_SWIZZLE_Y) {
/* The new swizzle is ZXY */
SET_SWZ(new_swizzle, 1, RC_SWIZZLE_X);
found_swizzle = 1;
} else { /* ZY[^Y] */
/* The new swizzle will be:
* XYZ (ZY. => XY. => XYZ) */
SET_SWZ(new_swizzle, 0, RC_SWIZZLE_X);
}
break;
/* ZW. Should have already been handled. */
case RC_SWIZZLE_W:
assert(0);
break;
}
break;
/* W.. */
case RC_SWIZZLE_W:
/* Legal swizzles that start with X: WWW, WZY */
switch (swz1) {
/* WW. Should have already been handled. */
case RC_SWIZZLE_W:
assert(0);
break;
/* WZ. */
case RC_SWIZZLE_Z:
/* The new swizzle will be WZY */
SET_SWZ(new_swizzle, 2, RC_SWIZZLE_Y);
found_swizzle = 1;
break;
/* WX. */
case RC_SWIZZLE_X:
/* WY. */
case RC_SWIZZLE_Y:
/* W[XY]Y */
if (swz2 == RC_SWIZZLE_Y) {
/* The new swizzle will be WZY */
SET_SWZ(new_swizzle, 1, RC_SWIZZLE_Z);
found_swizzle = 1;
} else { /* W[XY][^Y] */
/* The new swizzle will be:
* ZXY (WX. => XX. => ZX. => ZXY) or
* XYZ (WY. => XY. => XYZ)
*/
SET_SWZ(new_swizzle, 0, RC_SWIZZLE_X);
}
break;
}
break;
/* U.. 0.. 1.. H..*/
case RC_SWIZZLE_UNUSED:
case RC_SWIZZLE_ZERO:
case RC_SWIZZLE_ONE:
case RC_SWIZZLE_HALF:
SET_SWZ(new_swizzle, 0, RC_SWIZZLE_X);
break;
}
}
/* Handle the swizzle in the w channel. */
swz3 = GET_SWZ(reg->Swizzle, 3);
/* We can skip this if the swizzle in channel w is an inline constant. */
if (swz3 <= RC_SWIZZLE_W) {
for (chan = 0; chan < 3; chan++) {
unsigned old_swz = GET_SWZ(reg->Swizzle, chan);
unsigned new_swz = GET_SWZ(new_swizzle, chan);
/* If the swizzle in the w channel is the same as the
* swizzle in any other channels, we need to rewrite it.
* For example:
* reg->Swizzle == XWZW
* new_swizzle == XYZX
* Since the swizzle in the y channel is being
* rewritten from W -> Y we need to change the swizzle
* in the w channel from W -> Y as well.
*/
if (old_swz == swz3) {
SET_SWZ(new_swizzle, 3,
GET_SWZ(new_swizzle, chan));
break;
}
/* The swizzle in channel w will be overwritten by one
* of the new swizzles. */
if (new_swz == swz3) {
/* Find an unused swizzle */
unsigned i;
unsigned used = 0;
for (i = 0; i < 3; i++) {
used |= 1 << GET_SWZ(new_swizzle, i);
}
for (i = 0; i < 4; i++) {
if (used & (1 << i)) {
continue;
}
SET_SWZ(new_swizzle, 3, i);
}
}
}
}
for (chan = 0; chan < 4; chan++) {
unsigned old_swz = GET_SWZ(reg->Swizzle, chan);
unsigned new_swz = GET_SWZ(new_swizzle, chan);
if (old_swz == RC_SWIZZLE_UNUSED) {
continue;
}
/* We don't need to change the swizzle in channel w if it is
* an inline constant. These are always legal in the w channel.
*
* Swizzles with a value > RC_SWIZZLE_W are inline constants.
*/
if (chan == 3 && old_swz > RC_SWIZZLE_W) {
continue;
}
assert(new_swz <= RC_SWIZZLE_W);
switch (old_swz) {
case RC_SWIZZLE_ZERO:
imms[new_swz] = 0.0f;
break;
case RC_SWIZZLE_HALF:
if (reg->Negate & (1 << chan)) {
imms[new_swz] = -0.5f;
} else {
imms[new_swz] = 0.5f;
}
break;
case RC_SWIZZLE_ONE:
if (reg->Negate & (1 << chan)) {
imms[new_swz] = -1.0f;
} else {
imms[new_swz] = 1.0f;
}
break;
default:
imms[new_swz] = rc_get_constant_value(c, reg->Index,
reg->Swizzle, reg->Negate, chan);
}
SET_SWZ(reg->Swizzle, chan, new_swz);
}
reg->Index = rc_constants_add_immediate_vec4(&c->Program.Constants,
imms);
/* We need to set the register file to CONSTANT in case we are
* converting a non-constant register with constant swizzles (e.g.
* ONE, ZERO, HALF).
*/
reg->File = RC_FILE_CONSTANT;
reg->Negate = 0;
return 1;
}