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).
return lp_build_select(sel_bld, sel1, val2, tmp);
}
+
/**
* Generate code to do cube face selection and compute per-face texcoords.
*/
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;
*/
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);
}
projects / mesa.git / commitdiff