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-rw-r--r--src/gallium/drivers/cell/spu/spu_texture.c641
1 files changed, 641 insertions, 0 deletions
diff --git a/src/gallium/drivers/cell/spu/spu_texture.c b/src/gallium/drivers/cell/spu/spu_texture.c
new file mode 100644
index 0000000000..69784c8978
--- /dev/null
+++ b/src/gallium/drivers/cell/spu/spu_texture.c
@@ -0,0 +1,641 @@
+/**************************************************************************
+ *
+ * Copyright 2008 Tungsten Graphics, Inc., Cedar Park, Texas.
+ * All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sub license, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the
+ * next paragraph) shall be included in all copies or substantial portions
+ * of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
+ * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
+ * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+ * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+ * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ **************************************************************************/
+
+
+#include <math.h>
+
+#include "pipe/p_compiler.h"
+#include "spu_main.h"
+#include "spu_texture.h"
+#include "spu_tile.h"
+#include "spu_colorpack.h"
+#include "spu_dcache.h"
+
+
+/**
+ * Mark all tex cache entries as invalid.
+ */
+void
+invalidate_tex_cache(void)
+{
+ uint lvl;
+ for (lvl = 0; lvl < CELL_MAX_TEXTURE_LEVELS; lvl++) {
+ uint unit = 0;
+ uint bytes = 4 * spu.texture[unit].level[lvl].width
+ * spu.texture[unit].level[lvl].height;
+
+ if (spu.texture[unit].target == PIPE_TEXTURE_CUBE)
+ bytes *= 6;
+ else if (spu.texture[unit].target == PIPE_TEXTURE_3D)
+ bytes *= spu.texture[unit].level[lvl].depth;
+
+ spu_dcache_mark_dirty((unsigned) spu.texture[unit].level[lvl].start, bytes);
+ }
+}
+
+
+/**
+ * Get four texels from locations (x[0], y[0]), (x[1], y[1]) ...
+ *
+ * NOTE: in the typical case of bilinear filtering, the four texels
+ * are in a 2x2 group so we could get by with just two dcache fetches
+ * (two side-by-side texels per fetch). But when bilinear filtering
+ * wraps around a texture edge, we'll probably need code like we have
+ * now.
+ * FURTHERMORE: since we're rasterizing a quad of 2x2 pixels at a time,
+ * it's quite likely that the four pixels in a quad will need some of the
+ * same texels. So look into doing texture fetches for four pixels at
+ * a time.
+ */
+static void
+get_four_texels(const struct spu_texture_level *tlevel, uint face,
+ vec_int4 x, vec_int4 y,
+ vec_uint4 *texels)
+{
+ unsigned texture_ea = (uintptr_t) tlevel->start;
+ const vec_int4 tile_x = spu_rlmask(x, -5); /* tile_x = x / 32 */
+ const vec_int4 tile_y = spu_rlmask(y, -5); /* tile_y = y / 32 */
+ const qword offset_x = si_andi((qword) x, 0x1f); /* offset_x = x & 0x1f */
+ const qword offset_y = si_andi((qword) y, 0x1f); /* offset_y = y & 0x1f */
+
+ const qword tiles_per_row = (qword) spu_splats(tlevel->tiles_per_row);
+ const qword tile_size = (qword) spu_splats((unsigned) sizeof(tile_t));
+
+ qword tile_offset = si_mpya((qword) tile_y, tiles_per_row, (qword) tile_x);
+ tile_offset = si_mpy((qword) tile_offset, tile_size);
+
+ qword texel_offset = si_a(si_mpyui(offset_y, 32), offset_x);
+ texel_offset = si_mpyui(texel_offset, 4);
+
+ vec_uint4 offset = (vec_uint4) si_a(tile_offset, texel_offset);
+
+ texture_ea = texture_ea + face * tlevel->bytes_per_image;
+
+ spu_dcache_fetch_unaligned((qword *) & texels[0],
+ texture_ea + spu_extract(offset, 0), 4);
+ spu_dcache_fetch_unaligned((qword *) & texels[1],
+ texture_ea + spu_extract(offset, 1), 4);
+ spu_dcache_fetch_unaligned((qword *) & texels[2],
+ texture_ea + spu_extract(offset, 2), 4);
+ spu_dcache_fetch_unaligned((qword *) & texels[3],
+ texture_ea + spu_extract(offset, 3), 4);
+}
+
+
+/** clamp vec to [0, max] */
+static INLINE vector signed int
+spu_clamp(vector signed int vec, vector signed int max)
+{
+ static const vector signed int zero = {0,0,0,0};
+ vector unsigned int c;
+ c = spu_cmpgt(vec, zero); /* c = vec > zero ? ~0 : 0 */
+ vec = spu_sel(zero, vec, c);
+ c = spu_cmpgt(vec, max); /* c = vec > max ? ~0 : 0 */
+ vec = spu_sel(vec, max, c);
+ return vec;
+}
+
+
+
+/**
+ * Do nearest texture sampling for four pixels.
+ * \param colors returned colors in SOA format (rrrr, gggg, bbbb, aaaa).
+ */
+void
+sample_texture_2d_nearest(vector float s, vector float t,
+ uint unit, uint level, uint face,
+ vector float colors[4])
+{
+ const struct spu_texture_level *tlevel = &spu.texture[unit].level[level];
+ vector float ss = spu_mul(s, tlevel->scale_s);
+ vector float tt = spu_mul(t, tlevel->scale_t);
+ vector signed int is = spu_convts(ss, 0);
+ vector signed int it = spu_convts(tt, 0);
+ vec_uint4 texels[4];
+
+ /* PIPE_TEX_WRAP_REPEAT */
+ is = spu_and(is, tlevel->mask_s);
+ it = spu_and(it, tlevel->mask_t);
+
+ /* PIPE_TEX_WRAP_CLAMP */
+ is = spu_clamp(is, tlevel->max_s);
+ it = spu_clamp(it, tlevel->max_t);
+
+ get_four_texels(tlevel, face, is, it, texels);
+
+ /* convert four packed ARGBA pixels to float RRRR,GGGG,BBBB,AAAA */
+ spu_unpack_A8R8G8B8_transpose4(texels, colors);
+}
+
+
+/**
+ * Do bilinear texture sampling for four pixels.
+ * \param colors returned colors in SOA format (rrrr, gggg, bbbb, aaaa).
+ */
+void
+sample_texture_2d_bilinear(vector float s, vector float t,
+ uint unit, uint level, uint face,
+ vector float colors[4])
+{
+ const struct spu_texture_level *tlevel = &spu.texture[unit].level[level];
+ static const vector float half = {-0.5f, -0.5f, -0.5f, -0.5f};
+
+ vector float ss = spu_madd(s, tlevel->scale_s, half);
+ vector float tt = spu_madd(t, tlevel->scale_t, half);
+
+ vector signed int is0 = spu_convts(ss, 0);
+ vector signed int it0 = spu_convts(tt, 0);
+
+ /* is + 1, it + 1 */
+ vector signed int is1 = spu_add(is0, 1);
+ vector signed int it1 = spu_add(it0, 1);
+
+ /* PIPE_TEX_WRAP_REPEAT */
+ is0 = spu_and(is0, tlevel->mask_s);
+ it0 = spu_and(it0, tlevel->mask_t);
+ is1 = spu_and(is1, tlevel->mask_s);
+ it1 = spu_and(it1, tlevel->mask_t);
+
+ /* PIPE_TEX_WRAP_CLAMP */
+ is0 = spu_clamp(is0, tlevel->max_s);
+ it0 = spu_clamp(it0, tlevel->max_t);
+ is1 = spu_clamp(is1, tlevel->max_s);
+ it1 = spu_clamp(it1, tlevel->max_t);
+
+ /* get packed int texels */
+ vector unsigned int texels[16];
+ get_four_texels(tlevel, face, is0, it0, texels + 0); /* upper-left */
+ get_four_texels(tlevel, face, is1, it0, texels + 4); /* upper-right */
+ get_four_texels(tlevel, face, is0, it1, texels + 8); /* lower-left */
+ get_four_texels(tlevel, face, is1, it1, texels + 12); /* lower-right */
+
+ /* convert packed int texels to float colors */
+ vector float ftexels[16];
+ spu_unpack_A8R8G8B8_transpose4(texels + 0, ftexels + 0);
+ spu_unpack_A8R8G8B8_transpose4(texels + 4, ftexels + 4);
+ spu_unpack_A8R8G8B8_transpose4(texels + 8, ftexels + 8);
+ spu_unpack_A8R8G8B8_transpose4(texels + 12, ftexels + 12);
+
+ /* Compute weighting factors in [0,1]
+ * Multiply texcoord by 1024, AND with 1023, convert back to float.
+ */
+ vector float ss1024 = spu_mul(ss, spu_splats(1024.0f));
+ vector signed int iss1024 = spu_convts(ss1024, 0);
+ iss1024 = spu_and(iss1024, 1023);
+ vector float sWeights0 = spu_convtf(iss1024, 10);
+
+ vector float tt1024 = spu_mul(tt, spu_splats(1024.0f));
+ vector signed int itt1024 = spu_convts(tt1024, 0);
+ itt1024 = spu_and(itt1024, 1023);
+ vector float tWeights0 = spu_convtf(itt1024, 10);
+
+ /* 1 - sWeight and 1 - tWeight */
+ vector float sWeights1 = spu_sub(spu_splats(1.0f), sWeights0);
+ vector float tWeights1 = spu_sub(spu_splats(1.0f), tWeights0);
+
+ /* reds, for four pixels */
+ ftexels[ 0] = spu_mul(ftexels[ 0], spu_mul(sWeights1, tWeights1)); /*ul*/
+ ftexels[ 4] = spu_mul(ftexels[ 4], spu_mul(sWeights0, tWeights1)); /*ur*/
+ ftexels[ 8] = spu_mul(ftexels[ 8], spu_mul(sWeights1, tWeights0)); /*ll*/
+ ftexels[12] = spu_mul(ftexels[12], spu_mul(sWeights0, tWeights0)); /*lr*/
+ colors[0] = spu_add(spu_add(ftexels[0], ftexels[4]),
+ spu_add(ftexels[8], ftexels[12]));
+
+ /* greens, for four pixels */
+ ftexels[ 1] = spu_mul(ftexels[ 1], spu_mul(sWeights1, tWeights1)); /*ul*/
+ ftexels[ 5] = spu_mul(ftexels[ 5], spu_mul(sWeights0, tWeights1)); /*ur*/
+ ftexels[ 9] = spu_mul(ftexels[ 9], spu_mul(sWeights1, tWeights0)); /*ll*/
+ ftexels[13] = spu_mul(ftexels[13], spu_mul(sWeights0, tWeights0)); /*lr*/
+ colors[1] = spu_add(spu_add(ftexels[1], ftexels[5]),
+ spu_add(ftexels[9], ftexels[13]));
+
+ /* blues, for four pixels */
+ ftexels[ 2] = spu_mul(ftexels[ 2], spu_mul(sWeights1, tWeights1)); /*ul*/
+ ftexels[ 6] = spu_mul(ftexels[ 6], spu_mul(sWeights0, tWeights1)); /*ur*/
+ ftexels[10] = spu_mul(ftexels[10], spu_mul(sWeights1, tWeights0)); /*ll*/
+ ftexels[14] = spu_mul(ftexels[14], spu_mul(sWeights0, tWeights0)); /*lr*/
+ colors[2] = spu_add(spu_add(ftexels[2], ftexels[6]),
+ spu_add(ftexels[10], ftexels[14]));
+
+ /* alphas, for four pixels */
+ ftexels[ 3] = spu_mul(ftexels[ 3], spu_mul(sWeights1, tWeights1)); /*ul*/
+ ftexels[ 7] = spu_mul(ftexels[ 7], spu_mul(sWeights0, tWeights1)); /*ur*/
+ ftexels[11] = spu_mul(ftexels[11], spu_mul(sWeights1, tWeights0)); /*ll*/
+ ftexels[15] = spu_mul(ftexels[15], spu_mul(sWeights0, tWeights0)); /*lr*/
+ 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 *mOut0,
+ vector unsigned int *mOut1,
+ vector unsigned int *mOut2,
+ vector unsigned int *mOut3,
+ 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);
+
+ *mOut0 = aeim;
+ *mOut1 = bfjn;
+ *mOut2 = cgko;
+ *mOut3 = dhlp;
+}
+
+
+/**
+ * Bilinear filtering, using int instead of float arithmetic for computing
+ * sample weights.
+ */
+void
+sample_texture_2d_bilinear_int(vector float s, vector float t,
+ uint unit, uint level, uint face,
+ vector float colors[4])
+{
+ const struct spu_texture_level *tlevel = &spu.texture[unit].level[level];
+ 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, tlevel->scale_s, half);
+ vector float tt = spu_madd(t, tlevel->scale_t, half);
+
+ /* convert float coords to fixed-pt coords with 7 fraction bits */
+ vector signed int is = spu_convts(ss, 7); /* XXX really need floor() here */
+ vector signed int it = spu_convts(tt, 7); /* XXX really need floor() here */
+
+ /* compute integer texel weights in [0, 127] */
+ vector signed int sWeights0 = spu_and(is, 127);
+ vector signed int tWeights0 = spu_and(it, 127);
+ vector signed int sWeights1 = spu_sub(127, sWeights0);
+ vector signed int tWeights1 = spu_sub(127, tWeights0);
+
+ /* texel coords: is0 = is / 128, it0 = is / 128 */
+ vector signed int is0 = spu_rlmask(is, -7);
+ vector signed int it0 = spu_rlmask(it, -7);
+
+ /* texel coords: i1 = is0 + 1, it1 = it0 + 1 */
+ vector signed int is1 = spu_add(is0, 1);
+ vector signed int it1 = spu_add(it0, 1);
+
+ /* PIPE_TEX_WRAP_REPEAT */
+ is0 = spu_and(is0, tlevel->mask_s);
+ it0 = spu_and(it0, tlevel->mask_t);
+ is1 = spu_and(is1, tlevel->mask_s);
+ it1 = spu_and(it1, tlevel->mask_t);
+
+ /* PIPE_TEX_WRAP_CLAMP */
+ is0 = spu_clamp(is0, tlevel->max_s);
+ it0 = spu_clamp(it0, tlevel->max_t);
+ is1 = spu_clamp(is1, tlevel->max_s);
+ it1 = spu_clamp(it1, tlevel->max_t);
+
+ /* get packed int texels */
+ vector unsigned int texels[16];
+ get_four_texels(tlevel, face, is0, it0, texels + 0); /* upper-left */
+ get_four_texels(tlevel, face, is1, it0, texels + 4); /* upper-right */
+ get_four_texels(tlevel, face, is0, it1, texels + 8); /* lower-left */
+ get_four_texels(tlevel, face, 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 */
+ vector unsigned int texel0, texel1, texel2, texel3, texel4, texel5, texel6, texel7,
+ texel8, texel9, texel10, texel11, texel12, texel13, texel14, texel15;
+ transpose(&texel0, &texel1, &texel2, &texel3, texels + 0);
+ transpose(&texel4, &texel5, &texel6, &texel7, texels + 4);
+ transpose(&texel8, &texel9, &texel10, &texel11, texels + 8);
+ transpose(&texel12, &texel13, &texel14, &texel15, texels + 12);
+
+ /* computed weighted colors */
+ vector unsigned int c0, c1, c2, c3, cSum;
+
+ /* red */
+ c0 = (vector unsigned int) si_mpy((qword) texel0, si_mpy((qword) sWeights1, (qword) tWeights1)); /*ul*/
+ c1 = (vector unsigned int) si_mpy((qword) texel4, si_mpy((qword) sWeights0, (qword) tWeights1)); /*ur*/
+ c2 = (vector unsigned int) si_mpy((qword) texel8, si_mpy((qword) sWeights1, (qword) tWeights0)); /*ll*/
+ c3 = (vector unsigned int) si_mpy((qword) texel12, si_mpy((qword) sWeights0, (qword) tWeights0)); /*lr*/
+ cSum = spu_add(spu_add(c0, c1), spu_add(c2, c3));
+ colors[0] = spu_convtf(cSum, 22);
+
+ /* green */
+ c0 = (vector unsigned int) si_mpy((qword) texel1, si_mpy((qword) sWeights1, (qword) tWeights1)); /*ul*/
+ c1 = (vector unsigned int) si_mpy((qword) texel5, si_mpy((qword) sWeights0, (qword) tWeights1)); /*ur*/
+ c2 = (vector unsigned int) si_mpy((qword) texel9, si_mpy((qword) sWeights1, (qword) tWeights0)); /*ll*/
+ c3 = (vector unsigned int) si_mpy((qword) texel13, si_mpy((qword) sWeights0, (qword) tWeights0)); /*lr*/
+ cSum = spu_add(spu_add(c0, c1), spu_add(c2, c3));
+ colors[1] = spu_convtf(cSum, 22);
+
+ /* blue */
+ c0 = (vector unsigned int) si_mpy((qword) texel2, si_mpy((qword) sWeights1, (qword) tWeights1)); /*ul*/
+ c1 = (vector unsigned int) si_mpy((qword) texel6, si_mpy((qword) sWeights0, (qword) tWeights1)); /*ur*/
+ c2 = (vector unsigned int) si_mpy((qword) texel10, si_mpy((qword) sWeights1, (qword) tWeights0)); /*ll*/
+ c3 = (vector unsigned int) si_mpy((qword) texel14, si_mpy((qword) sWeights0, (qword) tWeights0)); /*lr*/
+ cSum = spu_add(spu_add(c0, c1), spu_add(c2, c3));
+ colors[2] = spu_convtf(cSum, 22);
+
+ /* alpha */
+ c0 = (vector unsigned int) si_mpy((qword) texel3, si_mpy((qword) sWeights1, (qword) tWeights1)); /*ul*/
+ c1 = (vector unsigned int) si_mpy((qword) texel7, si_mpy((qword) sWeights0, (qword) tWeights1)); /*ur*/
+ c2 = (vector unsigned int) si_mpy((qword) texel11, si_mpy((qword) sWeights1, (qword) tWeights0)); /*ll*/
+ c3 = (vector unsigned int) si_mpy((qword) texel15, si_mpy((qword) sWeights0, (qword) tWeights0)); /*lr*/
+ cSum = spu_add(spu_add(c0, c1), spu_add(c2, c3));
+ colors[3] = spu_convtf(cSum, 22);
+}
+
+
+
+/**
+ * Compute level of detail factor from texcoords.
+ */
+static INLINE float
+compute_lambda_2d(uint unit, vector float s, vector float t)
+{
+ uint baseLevel = 0;
+ float width = spu.texture[unit].level[baseLevel].width;
+ float height = spu.texture[unit].level[baseLevel].width;
+ float dsdx = width * (spu_extract(s, 1) - spu_extract(s, 0));
+ float dsdy = width * (spu_extract(s, 2) - spu_extract(s, 0));
+ float dtdx = height * (spu_extract(t, 1) - spu_extract(t, 0));
+ float dtdy = height * (spu_extract(t, 2) - spu_extract(t, 0));
+#if 0
+ /* ideal value */
+ float x = dsdx * dsdx + dtdx * dtdx;
+ float y = dsdy * dsdy + dtdy * dtdy;
+ float rho = x > y ? x : y;
+ rho = sqrtf(rho);
+#else
+ /* approximation */
+ dsdx = fabsf(dsdx);
+ dsdy = fabsf(dsdy);
+ dtdx = fabsf(dtdx);
+ dtdy = fabsf(dtdy);
+ float rho = (dsdx + dsdy + dtdx + dtdy) * 0.5;
+#endif
+ float lambda = logf(rho) * 1.442695f; /* compute logbase2(rho) */
+ return lambda;
+}
+
+
+/**
+ * Blend two sets of colors according to weight.
+ */
+static void
+blend_colors(vector float c0[4], const vector float c1[4], float weight)
+{
+ vector float t = spu_splats(weight);
+ vector float dc0 = spu_sub(c1[0], c0[0]);
+ vector float dc1 = spu_sub(c1[1], c0[1]);
+ vector float dc2 = spu_sub(c1[2], c0[2]);
+ vector float dc3 = spu_sub(c1[3], c0[3]);
+ c0[0] = spu_madd(dc0, t, c0[0]);
+ c0[1] = spu_madd(dc1, t, c0[1]);
+ c0[2] = spu_madd(dc2, t, c0[2]);
+ c0[3] = spu_madd(dc3, t, c0[3]);
+}
+
+
+/**
+ * Texture sampling with level of detail selection and possibly mipmap
+ * interpolation.
+ */
+void
+sample_texture_2d_lod(vector float s, vector float t,
+ uint unit, uint level_ignored, uint face,
+ vector float colors[4])
+{
+ /*
+ * Note that we're computing a lambda/lod here that's used for all
+ * four pixels in the quad.
+ */
+ float lambda = compute_lambda_2d(unit, s, t);
+
+ (void) face;
+ (void) level_ignored;
+
+ /* apply lod bias */
+ lambda += spu.sampler[unit].lod_bias;
+
+ /* clamp */
+ if (lambda < spu.sampler[unit].min_lod)
+ lambda = spu.sampler[unit].min_lod;
+ else if (lambda > spu.sampler[unit].max_lod)
+ lambda = spu.sampler[unit].max_lod;
+
+ if (lambda <= 0.0f) {
+ /* magnify */
+ spu.mag_sample_texture_2d[unit](s, t, unit, 0, face, colors);
+ }
+ else {
+ /* minify */
+ if (spu.sampler[unit].min_img_filter == PIPE_TEX_FILTER_LINEAR) {
+ /* sample two mipmap levels and interpolate */
+ int level = (int) lambda;
+ if (level > (int) spu.texture[unit].max_level)
+ level = spu.texture[unit].max_level;
+ spu.min_sample_texture_2d[unit](s, t, unit, level, face, colors);
+ if (spu.sampler[unit].min_img_filter == PIPE_TEX_FILTER_LINEAR) {
+ /* sample second mipmap level */
+ float weight = lambda - (float) level;
+ level++;
+ if (level <= (int) spu.texture[unit].max_level) {
+ vector float colors2[4];
+ spu.min_sample_texture_2d[unit](s, t, unit, level, face, colors2);
+ blend_colors(colors, colors2, weight);
+ }
+ }
+ }
+ else {
+ /* sample one mipmap level */
+ int level = (int) (lambda + 0.5f);
+ if (level > (int) spu.texture[unit].max_level)
+ level = spu.texture[unit].max_level;
+ spu.min_sample_texture_2d[unit](s, t, unit, level, face, colors);
+ }
+ }
+}
+
+
+/** XXX need a SIMD version of this */
+static unsigned
+choose_cube_face(float rx, float ry, float rz, float *newS, float *newT)
+{
+ /*
+ major axis
+ direction target sc tc ma
+ ---------- ------------------------------- --- --- ---
+ +rx TEXTURE_CUBE_MAP_POSITIVE_X_EXT -rz -ry rx
+ -rx TEXTURE_CUBE_MAP_NEGATIVE_X_EXT +rz -ry rx
+ +ry TEXTURE_CUBE_MAP_POSITIVE_Y_EXT +rx +rz ry
+ -ry TEXTURE_CUBE_MAP_NEGATIVE_Y_EXT +rx -rz ry
+ +rz TEXTURE_CUBE_MAP_POSITIVE_Z_EXT +rx -ry rz
+ -rz TEXTURE_CUBE_MAP_NEGATIVE_Z_EXT -rx -ry rz
+ */
+ const float arx = fabsf(rx);
+ const float ary = fabsf(ry);
+ const float arz = fabsf(rz);
+ unsigned face;
+ float sc, tc, ma;
+
+ if (arx > ary && arx > arz) {
+ if (rx >= 0.0F) {
+ face = PIPE_TEX_FACE_POS_X;
+ sc = -rz;
+ tc = -ry;
+ ma = arx;
+ }
+ else {
+ face = PIPE_TEX_FACE_NEG_X;
+ sc = rz;
+ tc = -ry;
+ ma = arx;
+ }
+ }
+ else if (ary > arx && ary > arz) {
+ if (ry >= 0.0F) {
+ face = PIPE_TEX_FACE_POS_Y;
+ sc = rx;
+ tc = rz;
+ ma = ary;
+ }
+ else {
+ face = PIPE_TEX_FACE_NEG_Y;
+ sc = rx;
+ tc = -rz;
+ ma = ary;
+ }
+ }
+ else {
+ if (rz > 0.0F) {
+ face = PIPE_TEX_FACE_POS_Z;
+ sc = rx;
+ tc = -ry;
+ ma = arz;
+ }
+ else {
+ face = PIPE_TEX_FACE_NEG_Z;
+ sc = -rx;
+ tc = -ry;
+ ma = arz;
+ }
+ }
+
+ *newS = (sc / ma + 1.0F) * 0.5F;
+ *newT = (tc / ma + 1.0F) * 0.5F;
+
+ return face;
+}
+
+
+
+void
+sample_texture_cube(vector float s, vector float t, vector float r,
+ uint unit, vector float colors[4])
+{
+ uint p, faces[4], level = 0;
+ float newS[4], newT[4];
+
+ /* Compute cube faces referenced by the four sets of texcoords.
+ * XXX we should SIMD-ize this.
+ */
+ for (p = 0; p < 4; p++) {
+ float rx = spu_extract(s, p);
+ float ry = spu_extract(t, p);
+ float rz = spu_extract(r, p);
+ faces[p] = choose_cube_face(rx, ry, rz, &newS[p], &newT[p]);
+ }
+
+ if (faces[0] == faces[1] &&
+ faces[0] == faces[2] &&
+ faces[0] == faces[3]) {
+ /* GOOD! All four texcoords refer to the same cube face */
+ s = (vector float) {newS[0], newS[1], newS[2], newS[3]};
+ t = (vector float) {newT[0], newT[1], newT[2], newT[3]};
+ spu.sample_texture_2d[unit](s, t, unit, level, faces[0], colors);
+ }
+ else {
+ /* BAD! The four texcoords refer to different faces */
+ for (p = 0; p < 4; p++) {
+ vector float c[4];
+
+ spu.sample_texture_2d[unit](spu_splats(newS[p]), spu_splats(newT[p]),
+ unit, level, faces[p], c);
+
+ float red = spu_extract(c[0], p);
+ float green = spu_extract(c[1], p);
+ float blue = spu_extract(c[2], p);
+ float alpha = spu_extract(c[3], p);
+
+ colors[0] = spu_insert(red, colors[0], p);
+ colors[1] = spu_insert(green, colors[1], p);
+ colors[2] = spu_insert(blue, colors[2], p);
+ colors[3] = spu_insert(alpha, colors[3], p);
+ }
+ }
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-06-03 22:46:12 +0000