diff options
Diffstat (limited to 'src/gallium/auxiliary/gallivm/lp_bld_sample.c')
| -rw-r--r-- | src/gallium/auxiliary/gallivm/lp_bld_sample.c | 761 |
1 files changed, 286 insertions, 475 deletions
diff --git a/src/gallium/auxiliary/gallivm/lp_bld_sample.c b/src/gallium/auxiliary/gallivm/lp_bld_sample.c index 39c3a2f9d9..1c352006f3 100644 --- a/src/gallium/auxiliary/gallivm/lp_bld_sample.c +++ b/src/gallium/auxiliary/gallivm/lp_bld_sample.c @@ -1414,72 +1414,6 @@ lp_build_cube_imapos(struct lp_build_context *coord_bld, LLVMValueRef coord) return ima; } -/** Helper used by lp_build_cube_lookup() */ -static LLVMValueRef -lp_build_cube_imaneg(struct lp_build_context *coord_bld, LLVMValueRef coord) -{ - /* ima = -0.5 / abs(coord); */ - LLVMValueRef negHalf = lp_build_const_vec(coord_bld->gallivm, coord_bld->type, -0.5); - LLVMValueRef absCoord = lp_build_abs(coord_bld, coord); - LLVMValueRef ima = lp_build_div(coord_bld, negHalf, absCoord); - return ima; -} - -/** - * Helper used by lp_build_cube_lookup() - * FIXME: the sign here can also be 0. - * Arithmetically this could definitely make a difference. Either - * fix the comment or use other (simpler) sign function, not sure - * which one it should be. - * \param sign scalar +1 or -1 - * \param coord float vector - * \param ima float vector - */ -static LLVMValueRef -lp_build_cube_coord(struct lp_build_context *coord_bld, - LLVMValueRef sign, int negate_coord, - LLVMValueRef coord, LLVMValueRef ima) -{ - /* return negate(coord) * ima * sign + 0.5; */ - LLVMValueRef half = lp_build_const_vec(coord_bld->gallivm, coord_bld->type, 0.5); - LLVMValueRef res; - - assert(negate_coord == +1 || negate_coord == -1); - - if (negate_coord == -1) { - coord = lp_build_negate(coord_bld, coord); - } - - res = lp_build_mul(coord_bld, coord, ima); - if (sign) { - sign = lp_build_broadcast_scalar(coord_bld, sign); - res = lp_build_mul(coord_bld, res, sign); - } - res = lp_build_add(coord_bld, res, half); - - return res; -} - - -/** Helper used by lp_build_cube_lookup() - * Return (major_coord >= 0) ? pos_face : neg_face; - */ -static LLVMValueRef -lp_build_cube_face(struct lp_build_sample_context *bld, - LLVMValueRef major_coord, - unsigned pos_face, unsigned neg_face) -{ - struct gallivm_state *gallivm = bld->gallivm; - LLVMBuilderRef builder = gallivm->builder; - LLVMValueRef cmp = LLVMBuildFCmp(builder, LLVMRealUGE, - major_coord, - bld->float_bld.zero, ""); - LLVMValueRef pos = lp_build_const_int32(gallivm, pos_face); - LLVMValueRef neg = lp_build_const_int32(gallivm, neg_face); - LLVMValueRef res = LLVMBuildSelect(builder, cmp, pos, neg, ""); - return res; -} - /** Helper for doing 3-wise selection. * Returns sel1 ? val2 : (sel0 ? val0 : val1). @@ -1497,6 +1431,7 @@ lp_build_select3(struct lp_build_context *sel_bld, return lp_build_select(sel_bld, sel1, val2, tmp); } + /** * Generate code to do cube face selection and compute per-face texcoords. */ @@ -1513,301 +1448,141 @@ lp_build_cube_lookup(struct lp_build_sample_context *bld, struct gallivm_state *gallivm = bld->gallivm; LLVMValueRef si, ti, ri; - if (1 || coord_bld->type.length > 4) { - /* - * Do per-pixel face selection. We cannot however (as we used to do) - * simply calculate the derivs afterwards (which is very bogus for - * explicit derivs btw) because the values would be "random" when - * not all pixels lie on the same face. So what we do here is just - * calculate the derivatives after scaling the coords by the absolute - * value of the inverse major axis, and essentially do rho calculation - * steps as if it were a 3d texture. This is perfect if all pixels hit - * the same face, but not so great at edges, I believe the max error - * should be sqrt(2) with no_rho_approx or 2 otherwise (essentially measuring - * the 3d distance between 2 points on the cube instead of measuring up/down - * the edge). Still this is possibly a win over just selecting the same face - * for all pixels. Unfortunately, something like that doesn't work for - * explicit derivatives. - */ - struct lp_build_context *cint_bld = &bld->int_coord_bld; - struct lp_type intctype = cint_bld->type; - LLVMTypeRef coord_vec_type = coord_bld->vec_type; - LLVMTypeRef cint_vec_type = cint_bld->vec_type; - LLVMValueRef as, at, ar, face, face_s, face_t; - LLVMValueRef as_ge_at, maxasat, ar_ge_as_at; - LLVMValueRef snewx, tnewx, snewy, tnewy, snewz, tnewz; - LLVMValueRef tnegi, rnegi; - LLVMValueRef ma, mai, signma, signmabit, imahalfpos; - LLVMValueRef posHalf = lp_build_const_vec(gallivm, coord_bld->type, 0.5); - LLVMValueRef signmask = lp_build_const_int_vec(gallivm, intctype, - 1 << (intctype.width - 1)); - LLVMValueRef signshift = lp_build_const_int_vec(gallivm, intctype, - intctype.width -1); - LLVMValueRef facex = lp_build_const_int_vec(gallivm, intctype, PIPE_TEX_FACE_POS_X); - LLVMValueRef facey = lp_build_const_int_vec(gallivm, intctype, PIPE_TEX_FACE_POS_Y); - LLVMValueRef facez = lp_build_const_int_vec(gallivm, intctype, PIPE_TEX_FACE_POS_Z); - LLVMValueRef s = coords[0]; - LLVMValueRef t = coords[1]; - LLVMValueRef r = coords[2]; - - assert(PIPE_TEX_FACE_NEG_X == PIPE_TEX_FACE_POS_X + 1); - assert(PIPE_TEX_FACE_NEG_Y == PIPE_TEX_FACE_POS_Y + 1); - assert(PIPE_TEX_FACE_NEG_Z == PIPE_TEX_FACE_POS_Z + 1); + /* + * Do per-pixel face selection. We cannot however (as we used to do) + * simply calculate the derivs afterwards (which is very bogus for + * explicit derivs btw) because the values would be "random" when + * not all pixels lie on the same face. So what we do here is just + * calculate the derivatives after scaling the coords by the absolute + * value of the inverse major axis, and essentially do rho calculation + * steps as if it were a 3d texture. This is perfect if all pixels hit + * the same face, but not so great at edges, I believe the max error + * should be sqrt(2) with no_rho_approx or 2 otherwise (essentially measuring + * the 3d distance between 2 points on the cube instead of measuring up/down + * the edge). Still this is possibly a win over just selecting the same face + * for all pixels. Unfortunately, something like that doesn't work for + * explicit derivatives. + */ + struct lp_build_context *cint_bld = &bld->int_coord_bld; + struct lp_type intctype = cint_bld->type; + LLVMTypeRef coord_vec_type = coord_bld->vec_type; + LLVMTypeRef cint_vec_type = cint_bld->vec_type; + LLVMValueRef as, at, ar, face, face_s, face_t; + LLVMValueRef as_ge_at, maxasat, ar_ge_as_at; + LLVMValueRef snewx, tnewx, snewy, tnewy, snewz, tnewz; + LLVMValueRef tnegi, rnegi; + LLVMValueRef ma, mai, signma, signmabit, imahalfpos; + LLVMValueRef posHalf = lp_build_const_vec(gallivm, coord_bld->type, 0.5); + LLVMValueRef signmask = lp_build_const_int_vec(gallivm, intctype, + 1 << (intctype.width - 1)); + LLVMValueRef signshift = lp_build_const_int_vec(gallivm, intctype, + intctype.width -1); + LLVMValueRef facex = lp_build_const_int_vec(gallivm, intctype, PIPE_TEX_FACE_POS_X); + LLVMValueRef facey = lp_build_const_int_vec(gallivm, intctype, PIPE_TEX_FACE_POS_Y); + LLVMValueRef facez = lp_build_const_int_vec(gallivm, intctype, PIPE_TEX_FACE_POS_Z); + LLVMValueRef s = coords[0]; + LLVMValueRef t = coords[1]; + LLVMValueRef r = coords[2]; + + assert(PIPE_TEX_FACE_NEG_X == PIPE_TEX_FACE_POS_X + 1); + assert(PIPE_TEX_FACE_NEG_Y == PIPE_TEX_FACE_POS_Y + 1); + assert(PIPE_TEX_FACE_NEG_Z == PIPE_TEX_FACE_POS_Z + 1); + + /* + * get absolute value (for x/y/z face selection) and sign bit + * (for mirroring minor coords and pos/neg face selection) + * of the original coords. + */ + as = lp_build_abs(&bld->coord_bld, s); + at = lp_build_abs(&bld->coord_bld, t); + ar = lp_build_abs(&bld->coord_bld, r); + /* + * major face determination: select x if x > y else select y + * select z if z >= max(x,y) else select previous result + * if some axis are the same we chose z over y, y over x - the + * dx10 spec seems to ask for it while OpenGL doesn't care (if we + * wouldn't care could save a select or two if using different + * compares and doing at_g_as_ar last since tnewx and tnewz are the + * same). + */ + as_ge_at = lp_build_cmp(coord_bld, PIPE_FUNC_GREATER, as, at); + maxasat = lp_build_max(coord_bld, as, at); + ar_ge_as_at = lp_build_cmp(coord_bld, PIPE_FUNC_GEQUAL, ar, maxasat); + + if (need_derivs && (derivs_in || + ((gallivm_debug & GALLIVM_DEBUG_NO_QUAD_LOD) && + (gallivm_debug & GALLIVM_DEBUG_NO_RHO_APPROX)))) { /* - * get absolute value (for x/y/z face selection) and sign bit - * (for mirroring minor coords and pos/neg face selection) - * of the original coords. + * XXX: This is really really complex. + * It is a bit overkill to use this for implicit derivatives as well, + * no way this is worth the cost in practice, but seems to be the + * only way for getting accurate and per-pixel lod values. */ - as = lp_build_abs(&bld->coord_bld, s); - at = lp_build_abs(&bld->coord_bld, t); - ar = lp_build_abs(&bld->coord_bld, r); - + LLVMValueRef ima, imahalf, tmp, ddx[3], ddy[3]; + LLVMValueRef madx, mady, madxdivma, madydivma; + LLVMValueRef sdxi, tdxi, rdxi, sdyi, tdyi, rdyi; + LLVMValueRef tdxnegi, rdxnegi, tdynegi, rdynegi; + LLVMValueRef sdxnewx, sdxnewy, sdxnewz, tdxnewx, tdxnewy, tdxnewz; + LLVMValueRef sdynewx, sdynewy, sdynewz, tdynewx, tdynewy, tdynewz; + LLVMValueRef face_sdx, face_tdx, face_sdy, face_tdy; /* - * major face determination: select x if x > y else select y - * select z if z >= max(x,y) else select previous result - * if some axis are the same we chose z over y, y over x - the - * dx10 spec seems to ask for it while OpenGL doesn't care (if we - * wouldn't care could save a select or two if using different - * compares and doing at_g_as_ar last since tnewx and tnewz are the - * same). + * s = 1/2 * ( sc / ma + 1) + * t = 1/2 * ( tc / ma + 1) + * + * s' = 1/2 * (sc' * ma - sc * ma') / ma^2 + * t' = 1/2 * (tc' * ma - tc * ma') / ma^2 + * + * dx.s = 0.5 * (dx.sc - sc * dx.ma / ma) / ma + * dx.t = 0.5 * (dx.tc - tc * dx.ma / ma) / ma + * dy.s = 0.5 * (dy.sc - sc * dy.ma / ma) / ma + * dy.t = 0.5 * (dy.tc - tc * dy.ma / ma) / ma */ - as_ge_at = lp_build_cmp(coord_bld, PIPE_FUNC_GREATER, as, at); - maxasat = lp_build_max(coord_bld, as, at); - ar_ge_as_at = lp_build_cmp(coord_bld, PIPE_FUNC_GEQUAL, ar, maxasat); - - if (need_derivs && (derivs_in || - ((gallivm_debug & GALLIVM_DEBUG_NO_QUAD_LOD) && - (gallivm_debug & GALLIVM_DEBUG_NO_RHO_APPROX)))) { - /* - * XXX: This is really really complex. - * It is a bit overkill to use this for implicit derivatives as well, - * no way this is worth the cost in practice, but seems to be the - * only way for getting accurate and per-pixel lod values. - */ - LLVMValueRef ima, imahalf, tmp, ddx[3], ddy[3]; - LLVMValueRef madx, mady, madxdivma, madydivma; - LLVMValueRef sdxi, tdxi, rdxi, sdyi, tdyi, rdyi; - LLVMValueRef tdxnegi, rdxnegi, tdynegi, rdynegi; - LLVMValueRef sdxnewx, sdxnewy, sdxnewz, tdxnewx, tdxnewy, tdxnewz; - LLVMValueRef sdynewx, sdynewy, sdynewz, tdynewx, tdynewy, tdynewz; - LLVMValueRef face_sdx, face_tdx, face_sdy, face_tdy; - /* - * s = 1/2 * ( sc / ma + 1) - * t = 1/2 * ( tc / ma + 1) - * - * s' = 1/2 * (sc' * ma - sc * ma') / ma^2 - * t' = 1/2 * (tc' * ma - tc * ma') / ma^2 - * - * dx.s = 0.5 * (dx.sc - sc * dx.ma / ma) / ma - * dx.t = 0.5 * (dx.tc - tc * dx.ma / ma) / ma - * dy.s = 0.5 * (dy.sc - sc * dy.ma / ma) / ma - * dy.t = 0.5 * (dy.tc - tc * dy.ma / ma) / ma - */ - - /* select ma, calculate ima */ - ma = lp_build_select3(coord_bld, as_ge_at, ar_ge_as_at, s, t, r); - mai = LLVMBuildBitCast(builder, ma, cint_vec_type, ""); - signmabit = LLVMBuildAnd(builder, mai, signmask, ""); - ima = lp_build_div(coord_bld, coord_bld->one, ma); - imahalf = lp_build_mul(coord_bld, posHalf, ima); - imahalfpos = lp_build_abs(coord_bld, imahalf); - - if (!derivs_in) { - ddx[0] = lp_build_ddx(coord_bld, s); - ddx[1] = lp_build_ddx(coord_bld, t); - ddx[2] = lp_build_ddx(coord_bld, r); - ddy[0] = lp_build_ddy(coord_bld, s); - ddy[1] = lp_build_ddy(coord_bld, t); - ddy[2] = lp_build_ddy(coord_bld, r); - } - else { - ddx[0] = derivs_in->ddx[0]; - ddx[1] = derivs_in->ddx[1]; - ddx[2] = derivs_in->ddx[2]; - ddy[0] = derivs_in->ddy[0]; - ddy[1] = derivs_in->ddy[1]; - ddy[2] = derivs_in->ddy[2]; - } - - /* select major derivatives */ - madx = lp_build_select3(coord_bld, as_ge_at, ar_ge_as_at, ddx[0], ddx[1], ddx[2]); - mady = lp_build_select3(coord_bld, as_ge_at, ar_ge_as_at, ddy[0], ddy[1], ddy[2]); - - si = LLVMBuildBitCast(builder, s, cint_vec_type, ""); - ti = LLVMBuildBitCast(builder, t, cint_vec_type, ""); - ri = LLVMBuildBitCast(builder, r, cint_vec_type, ""); - - sdxi = LLVMBuildBitCast(builder, ddx[0], cint_vec_type, ""); - tdxi = LLVMBuildBitCast(builder, ddx[1], cint_vec_type, ""); - rdxi = LLVMBuildBitCast(builder, ddx[2], cint_vec_type, ""); - - sdyi = LLVMBuildBitCast(builder, ddy[0], cint_vec_type, ""); - tdyi = LLVMBuildBitCast(builder, ddy[1], cint_vec_type, ""); - rdyi = LLVMBuildBitCast(builder, ddy[2], cint_vec_type, ""); - /* - * compute all possible new s/t coords, which does the mirroring, - * and do the same for derivs minor axes. - * snewx = signma * -r; - * tnewx = -t; - * snewy = s; - * tnewy = signma * r; - * snewz = signma * s; - * tnewz = -t; - */ - tnegi = LLVMBuildXor(builder, ti, signmask, ""); - rnegi = LLVMBuildXor(builder, ri, signmask, ""); - tdxnegi = LLVMBuildXor(builder, tdxi, signmask, ""); - rdxnegi = LLVMBuildXor(builder, rdxi, signmask, ""); - tdynegi = LLVMBuildXor(builder, tdyi, signmask, ""); - rdynegi = LLVMBuildXor(builder, rdyi, signmask, ""); - - snewx = LLVMBuildXor(builder, signmabit, rnegi, ""); - tnewx = tnegi; - sdxnewx = LLVMBuildXor(builder, signmabit, rdxnegi, ""); - tdxnewx = tdxnegi; - sdynewx = LLVMBuildXor(builder, signmabit, rdynegi, ""); - tdynewx = tdynegi; - - snewy = si; - tnewy = LLVMBuildXor(builder, signmabit, ri, ""); - sdxnewy = sdxi; - tdxnewy = LLVMBuildXor(builder, signmabit, rdxi, ""); - sdynewy = sdyi; - tdynewy = LLVMBuildXor(builder, signmabit, rdyi, ""); - - snewz = LLVMBuildXor(builder, signmabit, si, ""); - tnewz = tnegi; - sdxnewz = LLVMBuildXor(builder, signmabit, sdxi, ""); - tdxnewz = tdxnegi; - sdynewz = LLVMBuildXor(builder, signmabit, sdyi, ""); - tdynewz = tdynegi; - - /* select the mirrored values */ - face = lp_build_select3(cint_bld, as_ge_at, ar_ge_as_at, facex, facey, facez); - face_s = lp_build_select3(cint_bld, as_ge_at, ar_ge_as_at, snewx, snewy, snewz); - face_t = lp_build_select3(cint_bld, as_ge_at, ar_ge_as_at, tnewx, tnewy, tnewz); - face_sdx = lp_build_select3(cint_bld, as_ge_at, ar_ge_as_at, sdxnewx, sdxnewy, sdxnewz); - face_tdx = lp_build_select3(cint_bld, as_ge_at, ar_ge_as_at, tdxnewx, tdxnewy, tdxnewz); - face_sdy = lp_build_select3(cint_bld, as_ge_at, ar_ge_as_at, sdynewx, sdynewy, sdynewz); - face_tdy = lp_build_select3(cint_bld, as_ge_at, ar_ge_as_at, tdynewx, tdynewy, tdynewz); - - face_s = LLVMBuildBitCast(builder, face_s, coord_vec_type, ""); - face_t = LLVMBuildBitCast(builder, face_t, coord_vec_type, ""); - face_sdx = LLVMBuildBitCast(builder, face_sdx, coord_vec_type, ""); - face_tdx = LLVMBuildBitCast(builder, face_tdx, coord_vec_type, ""); - face_sdy = LLVMBuildBitCast(builder, face_sdy, coord_vec_type, ""); - face_tdy = LLVMBuildBitCast(builder, face_tdy, coord_vec_type, ""); - - /* deriv math, dx.s = 0.5 * (dx.sc - sc * dx.ma / ma) / ma */ - madxdivma = lp_build_mul(coord_bld, madx, ima); - tmp = lp_build_mul(coord_bld, madxdivma, face_s); - tmp = lp_build_sub(coord_bld, face_sdx, tmp); - derivs_out->ddx[0] = lp_build_mul(coord_bld, tmp, imahalf); - - /* dx.t = 0.5 * (dx.tc - tc * dx.ma / ma) / ma */ - tmp = lp_build_mul(coord_bld, madxdivma, face_t); - tmp = lp_build_sub(coord_bld, face_tdx, tmp); - derivs_out->ddx[1] = lp_build_mul(coord_bld, tmp, imahalf); - - /* dy.s = 0.5 * (dy.sc - sc * dy.ma / ma) / ma */ - madydivma = lp_build_mul(coord_bld, mady, ima); - tmp = lp_build_mul(coord_bld, madydivma, face_s); - tmp = lp_build_sub(coord_bld, face_sdy, tmp); - derivs_out->ddy[0] = lp_build_mul(coord_bld, tmp, imahalf); - - /* dy.t = 0.5 * (dy.tc - tc * dy.ma / ma) / ma */ - tmp = lp_build_mul(coord_bld, madydivma, face_t); - tmp = lp_build_sub(coord_bld, face_tdy, tmp); - derivs_out->ddy[1] = lp_build_mul(coord_bld, tmp, imahalf); - - signma = LLVMBuildLShr(builder, mai, signshift, ""); - coords[2] = LLVMBuildOr(builder, face, signma, "face"); - - /* project coords */ - face_s = lp_build_mul(coord_bld, face_s, imahalfpos); - face_t = lp_build_mul(coord_bld, face_t, imahalfpos); - - coords[0] = lp_build_add(coord_bld, face_s, posHalf); - coords[1] = lp_build_add(coord_bld, face_t, posHalf); - - return; + /* select ma, calculate ima */ + ma = lp_build_select3(coord_bld, as_ge_at, ar_ge_as_at, s, t, r); + mai = LLVMBuildBitCast(builder, ma, cint_vec_type, ""); + signmabit = LLVMBuildAnd(builder, mai, signmask, ""); + ima = lp_build_div(coord_bld, coord_bld->one, ma); + imahalf = lp_build_mul(coord_bld, posHalf, ima); + imahalfpos = lp_build_abs(coord_bld, imahalf); + + if (!derivs_in) { + ddx[0] = lp_build_ddx(coord_bld, s); + ddx[1] = lp_build_ddx(coord_bld, t); + ddx[2] = lp_build_ddx(coord_bld, r); + ddy[0] = lp_build_ddy(coord_bld, s); + ddy[1] = lp_build_ddy(coord_bld, t); + ddy[2] = lp_build_ddy(coord_bld, r); } - - else if (need_derivs) { - LLVMValueRef ddx_ddy[2], tmp[3], rho_vec; - static const unsigned char swizzle0[] = { /* no-op swizzle */ - 0, LP_BLD_SWIZZLE_DONTCARE, - LP_BLD_SWIZZLE_DONTCARE, LP_BLD_SWIZZLE_DONTCARE - }; - static const unsigned char swizzle1[] = { - 1, LP_BLD_SWIZZLE_DONTCARE, - LP_BLD_SWIZZLE_DONTCARE, LP_BLD_SWIZZLE_DONTCARE - }; - static const unsigned char swizzle01[] = { /* no-op swizzle */ - 0, 1, - LP_BLD_SWIZZLE_DONTCARE, LP_BLD_SWIZZLE_DONTCARE - }; - static const unsigned char swizzle23[] = { - 2, 3, - LP_BLD_SWIZZLE_DONTCARE, LP_BLD_SWIZZLE_DONTCARE - }; - static const unsigned char swizzle02[] = { - 0, 2, - LP_BLD_SWIZZLE_DONTCARE, LP_BLD_SWIZZLE_DONTCARE - }; - - /* - * scale the s/t/r coords pre-select/mirror so we can calculate - * "reasonable" derivs. - */ - ma = lp_build_select3(coord_bld, as_ge_at, ar_ge_as_at, s, t, r); - imahalfpos = lp_build_cube_imapos(coord_bld, ma); - s = lp_build_mul(coord_bld, s, imahalfpos); - t = lp_build_mul(coord_bld, t, imahalfpos); - r = lp_build_mul(coord_bld, r, imahalfpos); - - /* - * This isn't quite the same as the "ordinary" (3d deriv) path since we - * know the texture is square which simplifies things (we can omit the - * size mul which happens very early completely here and do it at the - * very end). - * Also always do calculations according to GALLIVM_DEBUG_NO_RHO_APPROX - * since the error can get quite big otherwise at edges. - * (With no_rho_approx max error is sqrt(2) at edges, same as it is - * without no_rho_approx for 2d textures, otherwise it would be factor 2.) - */ - ddx_ddy[0] = lp_build_packed_ddx_ddy_twocoord(coord_bld, s, t); - ddx_ddy[1] = lp_build_packed_ddx_ddy_onecoord(coord_bld, r); - - ddx_ddy[0] = lp_build_mul(coord_bld, ddx_ddy[0], ddx_ddy[0]); - ddx_ddy[1] = lp_build_mul(coord_bld, ddx_ddy[1], ddx_ddy[1]); - - tmp[0] = lp_build_swizzle_aos(coord_bld, ddx_ddy[0], swizzle01); - tmp[1] = lp_build_swizzle_aos(coord_bld, ddx_ddy[0], swizzle23); - tmp[2] = lp_build_swizzle_aos(coord_bld, ddx_ddy[1], swizzle02); - - rho_vec = lp_build_add(coord_bld, tmp[0], tmp[1]); - rho_vec = lp_build_add(coord_bld, rho_vec, tmp[2]); - - tmp[0] = lp_build_swizzle_aos(coord_bld, rho_vec, swizzle0); - tmp[1] = lp_build_swizzle_aos(coord_bld, rho_vec, swizzle1); - *rho = lp_build_max(coord_bld, tmp[0], tmp[1]); + else { + ddx[0] = derivs_in->ddx[0]; + ddx[1] = derivs_in->ddx[1]; + ddx[2] = derivs_in->ddx[2]; + ddy[0] = derivs_in->ddy[0]; + ddy[1] = derivs_in->ddy[1]; + ddy[2] = derivs_in->ddy[2]; } - if (!need_derivs) { - ma = lp_build_select3(coord_bld, as_ge_at, ar_ge_as_at, s, t, r); - } - mai = LLVMBuildBitCast(builder, ma, cint_vec_type, ""); - signmabit = LLVMBuildAnd(builder, mai, signmask, ""); + /* select major derivatives */ + madx = lp_build_select3(coord_bld, as_ge_at, ar_ge_as_at, ddx[0], ddx[1], ddx[2]); + mady = lp_build_select3(coord_bld, as_ge_at, ar_ge_as_at, ddy[0], ddy[1], ddy[2]); si = LLVMBuildBitCast(builder, s, cint_vec_type, ""); ti = LLVMBuildBitCast(builder, t, cint_vec_type, ""); ri = LLVMBuildBitCast(builder, r, cint_vec_type, ""); + sdxi = LLVMBuildBitCast(builder, ddx[0], cint_vec_type, ""); + tdxi = LLVMBuildBitCast(builder, ddx[1], cint_vec_type, ""); + rdxi = LLVMBuildBitCast(builder, ddx[2], cint_vec_type, ""); + + sdyi = LLVMBuildBitCast(builder, ddy[0], cint_vec_type, ""); + tdyi = LLVMBuildBitCast(builder, ddy[1], cint_vec_type, ""); + rdyi = LLVMBuildBitCast(builder, ddy[2], cint_vec_type, ""); + /* - * compute all possible new s/t coords, which does the mirroring + * compute all possible new s/t coords, which does the mirroring, + * and do the same for derivs minor axes. * snewx = signma * -r; * tnewx = -t; * snewy = s; @@ -1817,164 +1592,200 @@ lp_build_cube_lookup(struct lp_build_sample_context *bld, */ tnegi = LLVMBuildXor(builder, ti, signmask, ""); rnegi = LLVMBuildXor(builder, ri, signmask, ""); + tdxnegi = LLVMBuildXor(builder, tdxi, signmask, ""); + rdxnegi = LLVMBuildXor(builder, rdxi, signmask, ""); + tdynegi = LLVMBuildXor(builder, tdyi, signmask, ""); + rdynegi = LLVMBuildXor(builder, rdyi, signmask, ""); snewx = LLVMBuildXor(builder, signmabit, rnegi, ""); tnewx = tnegi; + sdxnewx = LLVMBuildXor(builder, signmabit, rdxnegi, ""); + tdxnewx = tdxnegi; + sdynewx = LLVMBuildXor(builder, signmabit, rdynegi, ""); + tdynewx = tdynegi; snewy = si; tnewy = LLVMBuildXor(builder, signmabit, ri, ""); + sdxnewy = sdxi; + tdxnewy = LLVMBuildXor(builder, signmabit, rdxi, ""); + sdynewy = sdyi; + tdynewy = LLVMBuildXor(builder, signmabit, rdyi, ""); snewz = LLVMBuildXor(builder, signmabit, si, ""); tnewz = tnegi; + sdxnewz = LLVMBuildXor(builder, signmabit, sdxi, ""); + tdxnewz = tdxnegi; + sdynewz = LLVMBuildXor(builder, signmabit, sdyi, ""); + tdynewz = tdynegi; /* select the mirrored values */ + face = lp_build_select3(cint_bld, as_ge_at, ar_ge_as_at, facex, facey, facez); face_s = lp_build_select3(cint_bld, as_ge_at, ar_ge_as_at, snewx, snewy, snewz); face_t = lp_build_select3(cint_bld, as_ge_at, ar_ge_as_at, tnewx, tnewy, tnewz); - face = lp_build_select3(cint_bld, as_ge_at, ar_ge_as_at, facex, facey, facez); + face_sdx = lp_build_select3(cint_bld, as_ge_at, ar_ge_as_at, sdxnewx, sdxnewy, sdxnewz); + face_tdx = lp_build_select3(cint_bld, as_ge_at, ar_ge_as_at, tdxnewx, tdxnewy, tdxnewz); + face_sdy = lp_build_select3(cint_bld, as_ge_at, ar_ge_as_at, sdynewx, sdynewy, sdynewz); + face_tdy = lp_build_select3(cint_bld, as_ge_at, ar_ge_as_at, tdynewx, tdynewy, tdynewz); face_s = LLVMBuildBitCast(builder, face_s, coord_vec_type, ""); face_t = LLVMBuildBitCast(builder, face_t, coord_vec_type, ""); + face_sdx = LLVMBuildBitCast(builder, face_sdx, coord_vec_type, ""); + face_tdx = LLVMBuildBitCast(builder, face_tdx, coord_vec_type, ""); + face_sdy = LLVMBuildBitCast(builder, face_sdy, coord_vec_type, ""); + face_tdy = LLVMBuildBitCast(builder, face_tdy, coord_vec_type, ""); + + /* deriv math, dx.s = 0.5 * (dx.sc - sc * dx.ma / ma) / ma */ + madxdivma = lp_build_mul(coord_bld, madx, ima); + tmp = lp_build_mul(coord_bld, madxdivma, face_s); + tmp = lp_build_sub(coord_bld, face_sdx, tmp); + derivs_out->ddx[0] = lp_build_mul(coord_bld, tmp, imahalf); + + /* dx.t = 0.5 * (dx.tc - tc * dx.ma / ma) / ma */ + tmp = lp_build_mul(coord_bld, madxdivma, face_t); + tmp = lp_build_sub(coord_bld, face_tdx, tmp); + derivs_out->ddx[1] = lp_build_mul(coord_bld, tmp, imahalf); + + /* dy.s = 0.5 * (dy.sc - sc * dy.ma / ma) / ma */ + madydivma = lp_build_mul(coord_bld, mady, ima); + tmp = lp_build_mul(coord_bld, madydivma, face_s); + tmp = lp_build_sub(coord_bld, face_sdy, tmp); + derivs_out->ddy[0] = lp_build_mul(coord_bld, tmp, imahalf); + + /* dy.t = 0.5 * (dy.tc - tc * dy.ma / ma) / ma */ + tmp = lp_build_mul(coord_bld, madydivma, face_t); + tmp = lp_build_sub(coord_bld, face_tdy, tmp); + derivs_out->ddy[1] = lp_build_mul(coord_bld, tmp, imahalf); - /* add +1 for neg face */ - /* XXX with AVX probably want to use another select here - - * as long as we ensure vblendvps gets used we can actually - * skip the comparison and just use sign as a "mask" directly. - */ signma = LLVMBuildLShr(builder, mai, signshift, ""); coords[2] = LLVMBuildOr(builder, face, signma, "face"); /* project coords */ - if (!need_derivs) { - imahalfpos = lp_build_cube_imapos(coord_bld, ma); - face_s = lp_build_mul(coord_bld, face_s, imahalfpos); - face_t = lp_build_mul(coord_bld, face_t, imahalfpos); - } + face_s = lp_build_mul(coord_bld, face_s, imahalfpos); + face_t = lp_build_mul(coord_bld, face_t, imahalfpos); coords[0] = lp_build_add(coord_bld, face_s, posHalf); coords[1] = lp_build_add(coord_bld, face_t, posHalf); + + return; } - else { - struct lp_build_if_state if_ctx; - LLVMValueRef face_s_var; - LLVMValueRef face_t_var; - LLVMValueRef face_var; - LLVMValueRef arx_ge_ary_arz, ary_ge_arx_arz; - LLVMValueRef shuffles[4]; - LLVMValueRef arxy_ge_aryx, arxy_ge_arzz, arxy_ge_arxy_arzz; - LLVMValueRef arxyxy, aryxzz, arxyxy_ge_aryxzz; - LLVMValueRef tmp[4], rxyz, arxyz; - struct lp_build_context *float_bld = &bld->float_bld; - LLVMValueRef s, t, r, face, face_s, face_t; - - assert(bld->coord_bld.type.length == 4); - - tmp[0] = s = coords[0]; - tmp[1] = t = coords[1]; - tmp[2] = r = coords[2]; - rxyz = lp_build_hadd_partial4(&bld->coord_bld, tmp, 3); - arxyz = lp_build_abs(&bld->coord_bld, rxyz); - - shuffles[0] = lp_build_const_int32(gallivm, 0); - shuffles[1] = lp_build_const_int32(gallivm, 1); - shuffles[2] = lp_build_const_int32(gallivm, 0); - shuffles[3] = lp_build_const_int32(gallivm, 1); - arxyxy = LLVMBuildShuffleVector(builder, arxyz, arxyz, LLVMConstVector(shuffles, 4), ""); - shuffles[0] = lp_build_const_int32(gallivm, 1); - shuffles[1] = lp_build_const_int32(gallivm, 0); - shuffles[2] = lp_build_const_int32(gallivm, 2); - shuffles[3] = lp_build_const_int32(gallivm, 2); - aryxzz = LLVMBuildShuffleVector(builder, arxyz, arxyz, LLVMConstVector(shuffles, 4), ""); - arxyxy_ge_aryxzz = lp_build_cmp(&bld->coord_bld, PIPE_FUNC_GEQUAL, arxyxy, aryxzz); - - shuffles[0] = lp_build_const_int32(gallivm, 0); - shuffles[1] = lp_build_const_int32(gallivm, 1); - arxy_ge_aryx = LLVMBuildShuffleVector(builder, arxyxy_ge_aryxzz, arxyxy_ge_aryxzz, - LLVMConstVector(shuffles, 2), ""); - shuffles[0] = lp_build_const_int32(gallivm, 2); - shuffles[1] = lp_build_const_int32(gallivm, 3); - arxy_ge_arzz = LLVMBuildShuffleVector(builder, arxyxy_ge_aryxzz, arxyxy_ge_aryxzz, - LLVMConstVector(shuffles, 2), ""); - arxy_ge_arxy_arzz = LLVMBuildAnd(builder, arxy_ge_aryx, arxy_ge_arzz, ""); - - arx_ge_ary_arz = LLVMBuildExtractElement(builder, arxy_ge_arxy_arzz, - lp_build_const_int32(gallivm, 0), ""); - arx_ge_ary_arz = LLVMBuildICmp(builder, LLVMIntNE, arx_ge_ary_arz, - lp_build_const_int32(gallivm, 0), ""); - ary_ge_arx_arz = LLVMBuildExtractElement(builder, arxy_ge_arxy_arzz, - lp_build_const_int32(gallivm, 1), ""); - ary_ge_arx_arz = LLVMBuildICmp(builder, LLVMIntNE, ary_ge_arx_arz, - lp_build_const_int32(gallivm, 0), ""); - face_s_var = lp_build_alloca(gallivm, bld->coord_bld.vec_type, "face_s_var"); - face_t_var = lp_build_alloca(gallivm, bld->coord_bld.vec_type, "face_t_var"); - face_var = lp_build_alloca(gallivm, bld->int_bld.vec_type, "face_var"); - - lp_build_if(&if_ctx, gallivm, arx_ge_ary_arz); - { - /* +/- X face */ - LLVMValueRef sign, ima; - si = LLVMBuildExtractElement(builder, rxyz, - lp_build_const_int32(gallivm, 0), ""); - /* +/- X face */ - sign = lp_build_sgn(float_bld, si); - ima = lp_build_cube_imaneg(coord_bld, s); - face_s = lp_build_cube_coord(coord_bld, sign, +1, r, ima); - face_t = lp_build_cube_coord(coord_bld, NULL, +1, t, ima); - face = lp_build_cube_face(bld, si, - PIPE_TEX_FACE_POS_X, - PIPE_TEX_FACE_NEG_X); - LLVMBuildStore(builder, face_s, face_s_var); - LLVMBuildStore(builder, face_t, face_t_var); - LLVMBuildStore(builder, face, face_var); - } - lp_build_else(&if_ctx); - { - struct lp_build_if_state if_ctx2; - - lp_build_if(&if_ctx2, gallivm, ary_ge_arx_arz); - { - LLVMValueRef sign, ima; - /* +/- Y face */ - ti = LLVMBuildExtractElement(builder, rxyz, - lp_build_const_int32(gallivm, 1), ""); - sign = lp_build_sgn(float_bld, ti); - ima = lp_build_cube_imaneg(coord_bld, t); - face_s = lp_build_cube_coord(coord_bld, NULL, -1, s, ima); - face_t = lp_build_cube_coord(coord_bld, sign, -1, r, ima); - face = lp_build_cube_face(bld, ti, - PIPE_TEX_FACE_POS_Y, - PIPE_TEX_FACE_NEG_Y); - LLVMBuildStore(builder, face_s, face_s_var); - LLVMBuildStore(builder, face_t, face_t_var); - LLVMBuildStore(builder, face, face_var); - } - lp_build_else(&if_ctx2); - { - /* +/- Z face */ - LLVMValueRef sign, ima; - ri = LLVMBuildExtractElement(builder, rxyz, - lp_build_const_int32(gallivm, 2), ""); - sign = lp_build_sgn(float_bld, ri); - ima = lp_build_cube_imaneg(coord_bld, r); - face_s = lp_build_cube_coord(coord_bld, sign, -1, s, ima); - face_t = lp_build_cube_coord(coord_bld, NULL, +1, t, ima); - face = lp_build_cube_face(bld, ri, - PIPE_TEX_FACE_POS_Z, - PIPE_TEX_FACE_NEG_Z); - LLVMBuildStore(builder, face_s, face_s_var); - LLVMBuildStore(builder, face_t, face_t_var); - LLVMBuildStore(builder, face, face_var); - } - lp_build_endif(&if_ctx2); - } + else if (need_derivs) { + LLVMValueRef ddx_ddy[2], tmp[3], rho_vec; + static const unsigned char swizzle0[] = { /* no-op swizzle */ + 0, LP_BLD_SWIZZLE_DONTCARE, + LP_BLD_SWIZZLE_DONTCARE, LP_BLD_SWIZZLE_DONTCARE + }; + static const unsigned char swizzle1[] = { + 1, LP_BLD_SWIZZLE_DONTCARE, + LP_BLD_SWIZZLE_DONTCARE, LP_BLD_SWIZZLE_DONTCARE + }; + static const unsigned char swizzle01[] = { /* no-op swizzle */ + 0, 1, + LP_BLD_SWIZZLE_DONTCARE, LP_BLD_SWIZZLE_DONTCARE + }; + static const unsigned char swizzle23[] = { + 2, 3, + LP_BLD_SWIZZLE_DONTCARE, LP_BLD_SWIZZLE_DONTCARE + }; + static const unsigned char swizzle02[] = { + 0, 2, + LP_BLD_SWIZZLE_DONTCARE, LP_BLD_SWIZZLE_DONTCARE + }; + + /* + * scale the s/t/r coords pre-select/mirror so we can calculate + * "reasonable" derivs. + */ + ma = lp_build_select3(coord_bld, as_ge_at, ar_ge_as_at, s, t, r); + imahalfpos = lp_build_cube_imapos(coord_bld, ma); + s = lp_build_mul(coord_bld, s, imahalfpos); + t = lp_build_mul(coord_bld, t, imahalfpos); + r = lp_build_mul(coord_bld, r, imahalfpos); + + /* + * This isn't quite the same as the "ordinary" (3d deriv) path since we + * know the texture is square which simplifies things (we can omit the + * size mul which happens very early completely here and do it at the + * very end). + * Also always do calculations according to GALLIVM_DEBUG_NO_RHO_APPROX + * since the error can get quite big otherwise at edges. + * (With no_rho_approx max error is sqrt(2) at edges, same as it is + * without no_rho_approx for 2d textures, otherwise it would be factor 2.) + */ + ddx_ddy[0] = lp_build_packed_ddx_ddy_twocoord(coord_bld, s, t); + ddx_ddy[1] = lp_build_packed_ddx_ddy_onecoord(coord_bld, r); - lp_build_endif(&if_ctx); + ddx_ddy[0] = lp_build_mul(coord_bld, ddx_ddy[0], ddx_ddy[0]); + ddx_ddy[1] = lp_build_mul(coord_bld, ddx_ddy[1], ddx_ddy[1]); - coords[0] = LLVMBuildLoad(builder, face_s_var, "face_s"); - coords[1] = LLVMBuildLoad(builder, face_t_var, "face_t"); - face = LLVMBuildLoad(builder, face_var, "face"); - coords[2] = lp_build_broadcast_scalar(&bld->int_coord_bld, face); + tmp[0] = lp_build_swizzle_aos(coord_bld, ddx_ddy[0], swizzle01); + tmp[1] = lp_build_swizzle_aos(coord_bld, ddx_ddy[0], swizzle23); + tmp[2] = lp_build_swizzle_aos(coord_bld, ddx_ddy[1], swizzle02); + + rho_vec = lp_build_add(coord_bld, tmp[0], tmp[1]); + rho_vec = lp_build_add(coord_bld, rho_vec, tmp[2]); + + tmp[0] = lp_build_swizzle_aos(coord_bld, rho_vec, swizzle0); + tmp[1] = lp_build_swizzle_aos(coord_bld, rho_vec, swizzle1); + *rho = lp_build_max(coord_bld, tmp[0], tmp[1]); } + + if (!need_derivs) { + ma = lp_build_select3(coord_bld, as_ge_at, ar_ge_as_at, s, t, r); + } + mai = LLVMBuildBitCast(builder, ma, cint_vec_type, ""); + signmabit = LLVMBuildAnd(builder, mai, signmask, ""); + + si = LLVMBuildBitCast(builder, s, cint_vec_type, ""); + ti = LLVMBuildBitCast(builder, t, cint_vec_type, ""); + ri = LLVMBuildBitCast(builder, r, cint_vec_type, ""); + + /* + * compute all possible new s/t coords, which does the mirroring + * snewx = signma * -r; + * tnewx = -t; + * snewy = s; + * tnewy = signma * r; + * snewz = signma * s; + * tnewz = -t; + */ + tnegi = LLVMBuildXor(builder, ti, signmask, ""); + rnegi = LLVMBuildXor(builder, ri, signmask, ""); + + snewx = LLVMBuildXor(builder, signmabit, rnegi, ""); + tnewx = tnegi; + + snewy = si; + tnewy = LLVMBuildXor(builder, signmabit, ri, ""); + + snewz = LLVMBuildXor(builder, signmabit, si, ""); + tnewz = tnegi; + + /* select the mirrored values */ + face_s = lp_build_select3(cint_bld, as_ge_at, ar_ge_as_at, snewx, snewy, snewz); + face_t = lp_build_select3(cint_bld, as_ge_at, ar_ge_as_at, tnewx, tnewy, tnewz); + face = lp_build_select3(cint_bld, as_ge_at, ar_ge_as_at, facex, facey, facez); + + face_s = LLVMBuildBitCast(builder, face_s, coord_vec_type, ""); + face_t = LLVMBuildBitCast(builder, face_t, coord_vec_type, ""); + + /* add +1 for neg face */ + /* XXX with AVX probably want to use another select here - + * as long as we ensure vblendvps gets used we can actually + * skip the comparison and just use sign as a "mask" directly. + */ + signma = LLVMBuildLShr(builder, mai, signshift, ""); + coords[2] = LLVMBuildOr(builder, face, signma, "face"); + + /* project coords */ + if (!need_derivs) { + imahalfpos = lp_build_cube_imapos(coord_bld, ma); + face_s = lp_build_mul(coord_bld, face_s, imahalfpos); + face_t = lp_build_mul(coord_bld, face_t, imahalfpos); + } + + coords[0] = lp_build_add(coord_bld, face_s, posHalf); + coords[1] = lp_build_add(coord_bld, face_t, posHalf); } |