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softpipe: further tighen up sample_cube() 

The code can fairly easily be translated to llvm...
This commit is contained in:
Brian Paul 2010-03-11 16:23:36 -07:00
parent 9ffdc78d1a
commit c72a3b4f2f
1 changed files with 21 additions and 45 deletions
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66
src/gallium/drivers/softpipe/sp_tex_sample.c
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@ -1647,57 +1647,33 @@ sample_cube(struct tgsi_sampler *tgsi_sampler,
const float arx = fabsf(rx), ary = fabsf(ry), arz = fabsf(rz);
if (arx >= ary && arx >= arz) {
if (rx >= 0.0F) {
for (j = 0; j < QUAD_SIZE; j++) {
const float ima = 1.0 / fabsf(s[j]);
ssss[j] = (-p[j] * ima + 1.0F) * 0.5F;
tttt[j] = (-t[j] * ima + 1.0F) * 0.5F;
samp->faces[j] = PIPE_TEX_FACE_POS_X;
}
}
else {
for (j = 0; j < QUAD_SIZE; j++) {
const float ima = 1.0 / fabsf(s[j]);
ssss[j] = ( p[j] * ima + 1.0F) * 0.5F;
tttt[j] = (-t[j] * ima + 1.0F) * 0.5F;
samp->faces[j] = PIPE_TEX_FACE_NEG_X;
}
float sign = (rx >= 0.0F) ? 1.0F : -1.0F;
uint face = (rx >= 0.0F) ? PIPE_TEX_FACE_POS_X : PIPE_TEX_FACE_NEG_X;
for (j = 0; j < QUAD_SIZE; j++) {
const float ima = -0.5F / fabsf(s[j]);
ssss[j] = sign * p[j] * ima + 0.5F;
tttt[j] = t[j] * ima + 0.5F;
samp->faces[j] = face;
}
}
else if (ary >= arx && ary >= arz) {
if (ry >= 0.0F) {
for (j = 0; j < QUAD_SIZE; j++) {
const float ima = 1.0 / fabsf(t[j]);
ssss[j] = (s[j] * ima + 1.0F) * 0.5F;
tttt[j] = (p[j] * ima + 1.0F) * 0.5F;
samp->faces[j] = PIPE_TEX_FACE_POS_Y;
}
}
else {
for (j = 0; j < QUAD_SIZE; j++) {
const float ima = 1.0 / fabsf(t[j]);
ssss[j] = ( s[j] * ima + 1.0F) * 0.5F;
tttt[j] = (-p[j] * ima + 1.0F) * 0.5F;
samp->faces[j] = PIPE_TEX_FACE_NEG_Y;
}
float sign = (ry >= 0.0F) ? 1.0F : -1.0F;
uint face = (ry >= 0.0F) ? PIPE_TEX_FACE_POS_Y : PIPE_TEX_FACE_NEG_Y;
for (j = 0; j < QUAD_SIZE; j++) {
const float ima = -0.5F / fabsf(t[j]);
ssss[j] = -s[j] * ima + 0.5F;
tttt[j] = sign * -p[j] * ima + 0.5F;
samp->faces[j] = face;
}
}
else {
if (rz > 0.0F) {
for (j = 0; j < QUAD_SIZE; j++) {
const float ima = 1.0 / fabsf(p[j]);
ssss[j] = ( s[j] * ima + 1.0F) * 0.5F;
tttt[j] = (-t[j] * ima + 1.0F) * 0.5F;
samp->faces[j] = PIPE_TEX_FACE_POS_Z;
}
}
else {
for (j = 0; j < QUAD_SIZE; j++) {
const float ima = 1.0 / fabsf(p[j]);
ssss[j] = (-s[j] * ima + 1.0F) * 0.5F;
tttt[j] = (-t[j] * ima + 1.0F) * 0.5F;
samp->faces[j] = PIPE_TEX_FACE_NEG_Z;
}
float sign = (rz >= 0.0F) ? 1.0F : -1.0F;
uint face = (rz >= 0.0F) ? PIPE_TEX_FACE_POS_Z : PIPE_TEX_FACE_NEG_Z;
for (j = 0; j < QUAD_SIZE; j++) {
const float ima = -0.5 / fabsf(p[j]);
ssss[j] = sign * -s[j] * ima + 0.5F;
tttt[j] = t[j] * ima + 0.5F;
samp->faces[j] = face;
}
}
}