From 67425aaa09df9cab76d7cc5c66e9e4595f0ccf40 Mon Sep 17 00:00:00 2001 From: Brian Paul Date: Mon, 13 Oct 2008 14:09:54 -0600 Subject: [PATCH] cell: bilinear texture filtering using integer arithmetic Fewer float/int conversions involved. --- src/gallium/drivers/cell/spu/spu_texture.c | 144 +++++++++++++++++++++ src/gallium/drivers/cell/spu/spu_texture.h | 5 + 2 files changed, 149 insertions(+) diff --git a/src/gallium/drivers/cell/spu/spu_texture.c b/src/gallium/drivers/cell/spu/spu_texture.c index ba62ad27fd9..c10268131d5 100644 --- a/src/gallium/drivers/cell/spu/spu_texture.c +++ b/src/gallium/drivers/cell/spu/spu_texture.c @@ -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); +} diff --git a/src/gallium/drivers/cell/spu/spu_texture.h b/src/gallium/drivers/cell/spu/spu_texture.h index d576aed7191..38a17deda25 100644 --- a/src/gallium/drivers/cell/spu/spu_texture.h +++ b/src/gallium/drivers/cell/spu/spu_texture.h @@ -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 */ -- 2.30.2