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cell: bilinear texture filtering using integer arithmetic

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Fewer float/int conversions involved.
This commit is contained in:
Brian Paul 2008-10-13 14:09:54 -06:00
parent c8fb368261
commit 67425aaa09
2 changed files with 149 additions and 0 deletions
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144
src/gallium/drivers/cell/spu/spu_texture.c
View file

@ -239,3 +239,147 @@ sample_texture4_bilinear(vector float s, vector float t,
colors[3] = spu_add(spu_add(ftexels[3], ftexels[7]),
spu_add(ftexels[11], ftexels[15]));
}
/**
* Adapted from /opt/cell/sdk/usr/spu/include/transpose_matrix4x4.h
*/
static INLINE void
transpose(vector unsigned int *mOut, vector unsigned int *mIn)
{
vector unsigned int abcd, efgh, ijkl, mnop; /* input vectors */
vector unsigned int aeim, bfjn, cgko, dhlp; /* output vectors */
vector unsigned int aibj, ckdl, emfn, gohp; /* intermediate vectors */
vector unsigned char shufflehi = ((vector unsigned char) {
0x00, 0x01, 0x02, 0x03,
0x10, 0x11, 0x12, 0x13,
0x04, 0x05, 0x06, 0x07,
0x14, 0x15, 0x16, 0x17});
vector unsigned char shufflelo = ((vector unsigned char) {
0x08, 0x09, 0x0A, 0x0B,
0x18, 0x19, 0x1A, 0x1B,
0x0C, 0x0D, 0x0E, 0x0F,
0x1C, 0x1D, 0x1E, 0x1F});
abcd = *(mIn+0);
efgh = *(mIn+1);
ijkl = *(mIn+2);
mnop = *(mIn+3);
aibj = spu_shuffle(abcd, ijkl, shufflehi);
ckdl = spu_shuffle(abcd, ijkl, shufflelo);
emfn = spu_shuffle(efgh, mnop, shufflehi);
gohp = spu_shuffle(efgh, mnop, shufflelo);
aeim = spu_shuffle(aibj, emfn, shufflehi);
bfjn = spu_shuffle(aibj, emfn, shufflelo);
cgko = spu_shuffle(ckdl, gohp, shufflehi);
dhlp = spu_shuffle(ckdl, gohp, shufflelo);
*(mOut+0) = aeim;
*(mOut+1) = bfjn;
*(mOut+2) = cgko;
*(mOut+3) = dhlp;
}
/**
* Bilinear filtering, using int intead of float arithmetic
*/
void
sample_texture4_bilinear_2(vector float s, vector float t,
vector float r, vector float q,
uint unit, vector float colors[4])
{
static const vector float half = {-0.5f, -0.5f, -0.5f, -0.5f};
/* Scale texcoords by size of texture, and add half pixel bias */
vector float ss = spu_madd(s, spu.texture[unit].width4, half);
vector float tt = spu_madd(t, spu.texture[unit].height4, half);
/* convert float coords to fixed-pt coords with 8 fraction bits */
vector unsigned int is = spu_convtu(ss, 8);
vector unsigned int it = spu_convtu(tt, 8);
/* compute integer texel weights in [0, 255] */
vector signed int sWeights0 = spu_and((vector signed int) is, 255);
vector signed int tWeights0 = spu_and((vector signed int) it, 255);
vector signed int sWeights1 = spu_sub(255, sWeights0);
vector signed int tWeights1 = spu_sub(255, tWeights0);
/* texel coords: is0 = is / 256, it0 = is / 256 */
vector unsigned int is0 = spu_rlmask(is, -8);
vector unsigned int it0 = spu_rlmask(it, -8);
/* texel coords: i1 = is0 + 1, it1 = it0 + 1 */
vector unsigned int is1 = spu_add(is0, 1);
vector unsigned int it1 = spu_add(it0, 1);
/* PIPE_TEX_WRAP_REPEAT */
is0 = spu_and(is0, spu.texture[unit].tex_size_x_mask);
it0 = spu_and(it0, spu.texture[unit].tex_size_y_mask);
is1 = spu_and(is1, spu.texture[unit].tex_size_x_mask);
it1 = spu_and(it1, spu.texture[unit].tex_size_y_mask);
/* get packed int texels */
vector unsigned int texels[16];
get_four_texels(unit, is0, it0, texels + 0); /* upper-left */
get_four_texels(unit, is1, it0, texels + 4); /* upper-right */
get_four_texels(unit, is0, it1, texels + 8); /* lower-left */
get_four_texels(unit, is1, it1, texels + 12); /* lower-right */
/* twiddle packed 32-bit BGRA pixels into RGBA as four unsigned ints */
{
static const unsigned char ZERO = 0x80;
int i;
for (i = 0; i < 16; i++) {
texels[i] = spu_shuffle(texels[i], texels[i],
((vector unsigned char) {
ZERO, ZERO, ZERO, 1,
ZERO, ZERO, ZERO, 2,
ZERO, ZERO, ZERO, 3,
ZERO, ZERO, ZERO, 0}));
}
}
/* convert RGBA,RGBA,RGBA,RGBA to RRRR,GGGG,BBBB,AAAA */
transpose(texels + 0, texels + 0);
transpose(texels + 4, texels + 4);
transpose(texels + 8, texels + 8);
transpose(texels + 12, texels + 12);
/* computed weighted colors */
vector unsigned int c0, c1, c2, c3, cSum;
/* red */
c0 = (vector unsigned int) si_mpyu((qword) texels[ 0], si_mpyu((qword) sWeights1, (qword) tWeights1)); /*ul*/
c1 = (vector unsigned int) si_mpyu((qword) texels[ 4], si_mpyu((qword) sWeights0, (qword) tWeights1)); /*ur*/
c2 = (vector unsigned int) si_mpyu((qword) texels[ 8], si_mpyu((qword) sWeights1, (qword) tWeights0)); /*ll*/
c3 = (vector unsigned int) si_mpyu((qword) texels[12], si_mpyu((qword) sWeights0, (qword) tWeights0)); /*lr*/
cSum = spu_add(spu_add(c0, c1), spu_add(c2, c3));
colors[0] = spu_convtf(cSum, 24);
/* green */
c0 = (vector unsigned int) si_mpyu((qword) texels[ 1], si_mpyu((qword) sWeights1, (qword) tWeights1)); /*ul*/
c1 = (vector unsigned int) si_mpyu((qword) texels[ 5], si_mpyu((qword) sWeights0, (qword) tWeights1)); /*ur*/
c2 = (vector unsigned int) si_mpyu((qword) texels[ 9], si_mpyu((qword) sWeights1, (qword) tWeights0)); /*ll*/
c3 = (vector unsigned int) si_mpyu((qword) texels[13], si_mpyu((qword) sWeights0, (qword) tWeights0)); /*lr*/
cSum = spu_add(spu_add(c0, c1), spu_add(c2, c3));
colors[1] = spu_convtf(cSum, 24);
/* blue */
c0 = (vector unsigned int) si_mpyu((qword) texels[ 2], si_mpyu((qword) sWeights1, (qword) tWeights1)); /*ul*/
c1 = (vector unsigned int) si_mpyu((qword) texels[ 6], si_mpyu((qword) sWeights0, (qword) tWeights1)); /*ur*/
c2 = (vector unsigned int) si_mpyu((qword) texels[10], si_mpyu((qword) sWeights1, (qword) tWeights0)); /*ll*/
c3 = (vector unsigned int) si_mpyu((qword) texels[14], si_mpyu((qword) sWeights0, (qword) tWeights0)); /*lr*/
cSum = spu_add(spu_add(c0, c1), spu_add(c2, c3));
colors[2] = spu_convtf(cSum, 24);
/* alpha */
c0 = (vector unsigned int) si_mpyu((qword) texels[ 3], si_mpyu((qword) sWeights1, (qword) tWeights1)); /*ul*/
c1 = (vector unsigned int) si_mpyu((qword) texels[ 7], si_mpyu((qword) sWeights0, (qword) tWeights1)); /*ur*/
c2 = (vector unsigned int) si_mpyu((qword) texels[11], si_mpyu((qword) sWeights1, (qword) tWeights0)); /*ll*/
c3 = (vector unsigned int) si_mpyu((qword) texels[15], si_mpyu((qword) sWeights0, (qword) tWeights0)); /*lr*/
cSum = spu_add(spu_add(c0, c1), spu_add(c2, c3));
colors[3] = spu_convtf(cSum, 24);
}

5
src/gallium/drivers/cell/spu/spu_texture.h
View file

@ -47,5 +47,10 @@ sample_texture4_bilinear(vector float s, vector float t,
vector float r, vector float q,
uint unit, vector float colors[4]);
extern void
sample_texture4_bilinear_2(vector float s, vector float t,
vector float r, vector float q,
uint unit, vector float colors[4]);
#endif /* SPU_TEXTURE_H */