diff options
Diffstat (limited to 'intern/cycles/kernel/geom/geom_curve.h')
| -rw-r--r-- | intern/cycles/kernel/geom/geom_curve.h | 866 |
1 files changed, 28 insertions, 838 deletions
diff --git a/intern/cycles/kernel/geom/geom_curve.h b/intern/cycles/kernel/geom/geom_curve.h index 84aaaab7453..e35267f02bf 100644 --- a/intern/cycles/kernel/geom/geom_curve.h +++ b/intern/cycles/kernel/geom/geom_curve.h @@ -16,9 +16,10 @@ CCL_NAMESPACE_BEGIN /* Curve Primitive * - * Curve primitive for rendering hair and fur. These can be render as flat ribbons - * or curves with actual thickness. The curve can also be rendered as line segments - * rather than curves for better performance */ + * Curve primitive for rendering hair and fur. These can be render as flat + * ribbons or curves with actual thickness. The curve can also be rendered as + * line segments rather than curves for better performance. + */ #ifdef __HAIR__ @@ -32,22 +33,22 @@ ccl_device float curve_attribute_float(KernelGlobals *kg, const ShaderData *sd, if(dy) *dy = 0.0f; #endif - return kernel_tex_fetch(__attributes_float, desc.offset + ccl_fetch(sd, prim)); + return kernel_tex_fetch(__attributes_float, desc.offset + sd->prim); } else if(desc.element == ATTR_ELEMENT_CURVE_KEY || desc.element == ATTR_ELEMENT_CURVE_KEY_MOTION) { - float4 curvedata = kernel_tex_fetch(__curves, ccl_fetch(sd, prim)); - int k0 = __float_as_int(curvedata.x) + PRIMITIVE_UNPACK_SEGMENT(ccl_fetch(sd, type)); + float4 curvedata = kernel_tex_fetch(__curves, sd->prim); + int k0 = __float_as_int(curvedata.x) + PRIMITIVE_UNPACK_SEGMENT(sd->type); int k1 = k0 + 1; float f0 = kernel_tex_fetch(__attributes_float, desc.offset + k0); float f1 = kernel_tex_fetch(__attributes_float, desc.offset + k1); #ifdef __RAY_DIFFERENTIALS__ - if(dx) *dx = ccl_fetch(sd, du).dx*(f1 - f0); + if(dx) *dx = sd->du.dx*(f1 - f0); if(dy) *dy = 0.0f; #endif - return (1.0f - ccl_fetch(sd, u))*f0 + ccl_fetch(sd, u)*f1; + return (1.0f - sd->u)*f0 + sd->u*f1; } else { #ifdef __RAY_DIFFERENTIALS__ @@ -71,22 +72,22 @@ ccl_device float3 curve_attribute_float3(KernelGlobals *kg, const ShaderData *sd if(dy) *dy = make_float3(0.0f, 0.0f, 0.0f); #endif - return float4_to_float3(kernel_tex_fetch(__attributes_float3, desc.offset + ccl_fetch(sd, prim))); + return float4_to_float3(kernel_tex_fetch(__attributes_float3, desc.offset + sd->prim)); } else if(desc.element == ATTR_ELEMENT_CURVE_KEY || desc.element == ATTR_ELEMENT_CURVE_KEY_MOTION) { - float4 curvedata = kernel_tex_fetch(__curves, ccl_fetch(sd, prim)); - int k0 = __float_as_int(curvedata.x) + PRIMITIVE_UNPACK_SEGMENT(ccl_fetch(sd, type)); + float4 curvedata = kernel_tex_fetch(__curves, sd->prim); + int k0 = __float_as_int(curvedata.x) + PRIMITIVE_UNPACK_SEGMENT(sd->type); int k1 = k0 + 1; float3 f0 = float4_to_float3(kernel_tex_fetch(__attributes_float3, desc.offset + k0)); float3 f1 = float4_to_float3(kernel_tex_fetch(__attributes_float3, desc.offset + k1)); #ifdef __RAY_DIFFERENTIALS__ - if(dx) *dx = ccl_fetch(sd, du).dx*(f1 - f0); + if(dx) *dx = sd->du.dx*(f1 - f0); if(dy) *dy = make_float3(0.0f, 0.0f, 0.0f); #endif - return (1.0f - ccl_fetch(sd, u))*f0 + ccl_fetch(sd, u)*f1; + return (1.0f - sd->u)*f0 + sd->u*f1; } else { #ifdef __RAY_DIFFERENTIALS__ @@ -104,22 +105,22 @@ ccl_device float curve_thickness(KernelGlobals *kg, ShaderData *sd) { float r = 0.0f; - if(ccl_fetch(sd, type) & PRIMITIVE_ALL_CURVE) { - float4 curvedata = kernel_tex_fetch(__curves, ccl_fetch(sd, prim)); - int k0 = __float_as_int(curvedata.x) + PRIMITIVE_UNPACK_SEGMENT(ccl_fetch(sd, type)); + if(sd->type & PRIMITIVE_ALL_CURVE) { + float4 curvedata = kernel_tex_fetch(__curves, sd->prim); + int k0 = __float_as_int(curvedata.x) + PRIMITIVE_UNPACK_SEGMENT(sd->type); int k1 = k0 + 1; float4 P_curve[2]; - if(ccl_fetch(sd, type) & PRIMITIVE_CURVE) { + if(sd->type & PRIMITIVE_CURVE) { P_curve[0]= kernel_tex_fetch(__curve_keys, k0); P_curve[1]= kernel_tex_fetch(__curve_keys, k1); } else { - motion_curve_keys(kg, ccl_fetch(sd, object), ccl_fetch(sd, prim), ccl_fetch(sd, time), k0, k1, P_curve); + motion_curve_keys(kg, sd->object, sd->prim, sd->time, k0, k1, P_curve); } - r = (P_curve[1].w - P_curve[0].w) * ccl_fetch(sd, u) + P_curve[0].w; + r = (P_curve[1].w - P_curve[0].w) * sd->u + P_curve[0].w; } return r*2.0f; @@ -130,8 +131,8 @@ ccl_device float curve_thickness(KernelGlobals *kg, ShaderData *sd) ccl_device float3 curve_motion_center_location(KernelGlobals *kg, ShaderData *sd) { - float4 curvedata = kernel_tex_fetch(__curves, ccl_fetch(sd, prim)); - int k0 = __float_as_int(curvedata.x) + PRIMITIVE_UNPACK_SEGMENT(ccl_fetch(sd, type)); + float4 curvedata = kernel_tex_fetch(__curves, sd->prim); + int k0 = __float_as_int(curvedata.x) + PRIMITIVE_UNPACK_SEGMENT(sd->type); int k1 = k0 + 1; float4 P_curve[2]; @@ -139,23 +140,23 @@ ccl_device float3 curve_motion_center_location(KernelGlobals *kg, ShaderData *sd P_curve[0]= kernel_tex_fetch(__curve_keys, k0); P_curve[1]= kernel_tex_fetch(__curve_keys, k1); - return float4_to_float3(P_curve[1]) * ccl_fetch(sd, u) + float4_to_float3(P_curve[0]) * (1.0f - ccl_fetch(sd, u)); + return float4_to_float3(P_curve[1]) * sd->u + float4_to_float3(P_curve[0]) * (1.0f - sd->u); } /* Curve tangent normal */ ccl_device float3 curve_tangent_normal(KernelGlobals *kg, ShaderData *sd) -{ +{ float3 tgN = make_float3(0.0f,0.0f,0.0f); - if(ccl_fetch(sd, type) & PRIMITIVE_ALL_CURVE) { + if(sd->type & PRIMITIVE_ALL_CURVE) { - tgN = -(-ccl_fetch(sd, I) - ccl_fetch(sd, dPdu) * (dot(ccl_fetch(sd, dPdu),-ccl_fetch(sd, I)) / len_squared(ccl_fetch(sd, dPdu)))); + tgN = -(-sd->I - sd->dPdu * (dot(sd->dPdu,-sd->I) / len_squared(sd->dPdu))); tgN = normalize(tgN); /* need to find suitable scaled gd for corrected normal */ #if 0 - tgN = normalize(tgN - gd * ccl_fetch(sd, dPdu)); + tgN = normalize(tgN - gd * sd->dPdu); #endif } @@ -213,817 +214,6 @@ ccl_device_inline void curvebounds(float *lower, float *upper, float *extremta, } } -#ifdef __KERNEL_SSE2__ -ccl_device_inline ssef transform_point_T3(const ssef t[3], const ssef &a) -{ - return madd(shuffle<0>(a), t[0], madd(shuffle<1>(a), t[1], shuffle<2>(a) * t[2])); -} -#endif - -#ifdef __KERNEL_SSE2__ -/* Pass P and dir by reference to aligned vector */ -ccl_device_forceinline bool bvh_cardinal_curve_intersect(KernelGlobals *kg, Intersection *isect, - const float3 &P, const float3 &dir, uint visibility, int object, int curveAddr, float time, int type, uint *lcg_state, float difl, float extmax) -#else -ccl_device_forceinline bool bvh_cardinal_curve_intersect(KernelGlobals *kg, Intersection *isect, - float3 P, float3 dir, uint visibility, int object, int curveAddr, float time,int type, uint *lcg_state, float difl, float extmax) -#endif -{ - int segment = PRIMITIVE_UNPACK_SEGMENT(type); - float epsilon = 0.0f; - float r_st, r_en; - - int depth = kernel_data.curve.subdivisions; - int flags = kernel_data.curve.curveflags; - int prim = kernel_tex_fetch(__prim_index, curveAddr); - -#ifdef __KERNEL_SSE2__ - ssef vdir = load4f(dir); - ssef vcurve_coef[4]; - const float3 *curve_coef = (float3 *)vcurve_coef; - - { - ssef dtmp = vdir * vdir; - ssef d_ss = mm_sqrt(dtmp + shuffle<2>(dtmp)); - ssef rd_ss = load1f_first(1.0f) / d_ss; - - ssei v00vec = load4i((ssei *)&kg->__curves.data[prim]); - int2 &v00 = (int2 &)v00vec; - - int k0 = v00.x + segment; - int k1 = k0 + 1; - int ka = max(k0 - 1, v00.x); - int kb = min(k1 + 1, v00.x + v00.y - 1); - - ssef P_curve[4]; - - if(type & PRIMITIVE_CURVE) { - P_curve[0] = load4f(&kg->__curve_keys.data[ka].x); - P_curve[1] = load4f(&kg->__curve_keys.data[k0].x); - P_curve[2] = load4f(&kg->__curve_keys.data[k1].x); - P_curve[3] = load4f(&kg->__curve_keys.data[kb].x); - } - else { - int fobject = (object == OBJECT_NONE)? kernel_tex_fetch(__prim_object, curveAddr): object; - motion_cardinal_curve_keys(kg, fobject, prim, time, ka, k0, k1, kb, (float4*)&P_curve); - } - - ssef rd_sgn = set_sign_bit<0, 1, 1, 1>(shuffle<0>(rd_ss)); - ssef mul_zxxy = shuffle<2, 0, 0, 1>(vdir) * rd_sgn; - ssef mul_yz = shuffle<1, 2, 1, 2>(vdir) * mul_zxxy; - ssef mul_shuf = shuffle<0, 1, 2, 3>(mul_zxxy, mul_yz); - ssef vdir0 = vdir & cast(ssei(0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0)); - - ssef htfm0 = shuffle<0, 2, 0, 3>(mul_shuf, vdir0); - ssef htfm1 = shuffle<1, 0, 1, 3>(load1f_first(extract<0>(d_ss)), vdir0); - ssef htfm2 = shuffle<1, 3, 2, 3>(mul_shuf, vdir0); - - ssef htfm[] = { htfm0, htfm1, htfm2 }; - ssef vP = load4f(P); - ssef p0 = transform_point_T3(htfm, P_curve[0] - vP); - ssef p1 = transform_point_T3(htfm, P_curve[1] - vP); - ssef p2 = transform_point_T3(htfm, P_curve[2] - vP); - ssef p3 = transform_point_T3(htfm, P_curve[3] - vP); - - float fc = 0.71f; - ssef vfc = ssef(fc); - ssef vfcxp3 = vfc * p3; - - vcurve_coef[0] = p1; - vcurve_coef[1] = vfc * (p2 - p0); - vcurve_coef[2] = madd(ssef(fc * 2.0f), p0, madd(ssef(fc - 3.0f), p1, msub(ssef(3.0f - 2.0f * fc), p2, vfcxp3))); - vcurve_coef[3] = msub(ssef(fc - 2.0f), p2 - p1, msub(vfc, p0, vfcxp3)); - - r_st = ((float4 &)P_curve[1]).w; - r_en = ((float4 &)P_curve[2]).w; - } -#else - float3 curve_coef[4]; - - /* curve Intersection check */ - /* obtain curve parameters */ - { - /* ray transform created - this should be created at beginning of intersection loop */ - Transform htfm; - float d = sqrtf(dir.x * dir.x + dir.z * dir.z); - htfm = make_transform( - dir.z / d, 0, -dir.x /d, 0, - -dir.x * dir.y /d, d, -dir.y * dir.z /d, 0, - dir.x, dir.y, dir.z, 0, - 0, 0, 0, 1); - - float4 v00 = kernel_tex_fetch(__curves, prim); - - int k0 = __float_as_int(v00.x) + segment; - int k1 = k0 + 1; - - int ka = max(k0 - 1,__float_as_int(v00.x)); - int kb = min(k1 + 1,__float_as_int(v00.x) + __float_as_int(v00.y) - 1); - - float4 P_curve[4]; - - if(type & PRIMITIVE_CURVE) { - P_curve[0] = kernel_tex_fetch(__curve_keys, ka); - P_curve[1] = kernel_tex_fetch(__curve_keys, k0); - P_curve[2] = kernel_tex_fetch(__curve_keys, k1); - P_curve[3] = kernel_tex_fetch(__curve_keys, kb); - } - else { - int fobject = (object == OBJECT_NONE)? kernel_tex_fetch(__prim_object, curveAddr): object; - motion_cardinal_curve_keys(kg, fobject, prim, time, ka, k0, k1, kb, P_curve); - } - - float3 p0 = transform_point(&htfm, float4_to_float3(P_curve[0]) - P); - float3 p1 = transform_point(&htfm, float4_to_float3(P_curve[1]) - P); - float3 p2 = transform_point(&htfm, float4_to_float3(P_curve[2]) - P); - float3 p3 = transform_point(&htfm, float4_to_float3(P_curve[3]) - P); - - float fc = 0.71f; - curve_coef[0] = p1; - curve_coef[1] = -fc*p0 + fc*p2; - curve_coef[2] = 2.0f * fc * p0 + (fc - 3.0f) * p1 + (3.0f - 2.0f * fc) * p2 - fc * p3; - curve_coef[3] = -fc * p0 + (2.0f - fc) * p1 + (fc - 2.0f) * p2 + fc * p3; - r_st = P_curve[1].w; - r_en = P_curve[2].w; - } -#endif - - float r_curr = max(r_st, r_en); - - if((flags & CURVE_KN_RIBBONS) || !(flags & CURVE_KN_BACKFACING)) - epsilon = 2 * r_curr; - - /* find bounds - this is slow for cubic curves */ - float upper, lower; - - float zextrem[4]; - curvebounds(&lower, &upper, &zextrem[0], &zextrem[1], &zextrem[2], &zextrem[3], curve_coef[0].z, curve_coef[1].z, curve_coef[2].z, curve_coef[3].z); - if(lower - r_curr > isect->t || upper + r_curr < epsilon) - return false; - - /* minimum width extension */ - float mw_extension = min(difl * fabsf(upper), extmax); - float r_ext = mw_extension + r_curr; - - float xextrem[4]; - curvebounds(&lower, &upper, &xextrem[0], &xextrem[1], &xextrem[2], &xextrem[3], curve_coef[0].x, curve_coef[1].x, curve_coef[2].x, curve_coef[3].x); - if(lower > r_ext || upper < -r_ext) - return false; - - float yextrem[4]; - curvebounds(&lower, &upper, &yextrem[0], &yextrem[1], &yextrem[2], &yextrem[3], curve_coef[0].y, curve_coef[1].y, curve_coef[2].y, curve_coef[3].y); - if(lower > r_ext || upper < -r_ext) - return false; - - /* setup recurrent loop */ - int level = 1 << depth; - int tree = 0; - float resol = 1.0f / (float)level; - bool hit = false; - - /* begin loop */ - while(!(tree >> (depth))) { - float i_st = tree * resol; - float i_en = i_st + (level * resol); -#ifdef __KERNEL_SSE2__ - ssef vi_st = ssef(i_st), vi_en = ssef(i_en); - ssef vp_st = madd(madd(madd(vcurve_coef[3], vi_st, vcurve_coef[2]), vi_st, vcurve_coef[1]), vi_st, vcurve_coef[0]); - ssef vp_en = madd(madd(madd(vcurve_coef[3], vi_en, vcurve_coef[2]), vi_en, vcurve_coef[1]), vi_en, vcurve_coef[0]); - - ssef vbmin = min(vp_st, vp_en); - ssef vbmax = max(vp_st, vp_en); - - float3 &bmin = (float3 &)vbmin, &bmax = (float3 &)vbmax; - float &bminx = bmin.x, &bminy = bmin.y, &bminz = bmin.z; - float &bmaxx = bmax.x, &bmaxy = bmax.y, &bmaxz = bmax.z; - float3 &p_st = (float3 &)vp_st, &p_en = (float3 &)vp_en; -#else - float3 p_st = ((curve_coef[3] * i_st + curve_coef[2]) * i_st + curve_coef[1]) * i_st + curve_coef[0]; - float3 p_en = ((curve_coef[3] * i_en + curve_coef[2]) * i_en + curve_coef[1]) * i_en + curve_coef[0]; - - float bminx = min(p_st.x, p_en.x); - float bmaxx = max(p_st.x, p_en.x); - float bminy = min(p_st.y, p_en.y); - float bmaxy = max(p_st.y, p_en.y); - float bminz = min(p_st.z, p_en.z); - float bmaxz = max(p_st.z, p_en.z); -#endif - - if(xextrem[0] >= i_st && xextrem[0] <= i_en) { - bminx = min(bminx,xextrem[1]); - bmaxx = max(bmaxx,xextrem[1]); - } - if(xextrem[2] >= i_st && xextrem[2] <= i_en) { - bminx = min(bminx,xextrem[3]); - bmaxx = max(bmaxx,xextrem[3]); - } - if(yextrem[0] >= i_st && yextrem[0] <= i_en) { - bminy = min(bminy,yextrem[1]); - bmaxy = max(bmaxy,yextrem[1]); - } - if(yextrem[2] >= i_st && yextrem[2] <= i_en) { - bminy = min(bminy,yextrem[3]); - bmaxy = max(bmaxy,yextrem[3]); - } - if(zextrem[0] >= i_st && zextrem[0] <= i_en) { - bminz = min(bminz,zextrem[1]); - bmaxz = max(bmaxz,zextrem[1]); - } - if(zextrem[2] >= i_st && zextrem[2] <= i_en) { - bminz = min(bminz,zextrem[3]); - bmaxz = max(bmaxz,zextrem[3]); - } - - float r1 = r_st + (r_en - r_st) * i_st; - float r2 = r_st + (r_en - r_st) * i_en; - r_curr = max(r1, r2); - - mw_extension = min(difl * fabsf(bmaxz), extmax); - float r_ext = mw_extension + r_curr; - float coverage = 1.0f; - - if(bminz - r_curr > isect->t || bmaxz + r_curr < epsilon || bminx > r_ext|| bmaxx < -r_ext|| bminy > r_ext|| bmaxy < -r_ext) { - /* the bounding box does not overlap the square centered at O */ - tree += level; - level = tree & -tree; - } - else if(level == 1) { - - /* the maximum recursion depth is reached. - * check if dP0.(Q-P0)>=0 and dPn.(Pn-Q)>=0. - * dP* is reversed if necessary.*/ - float t = isect->t; - float u = 0.0f; - float gd = 0.0f; - - if(flags & CURVE_KN_RIBBONS) { - float3 tg = (p_en - p_st); - float w = tg.x * tg.x + tg.y * tg.y; - if(w == 0) { - tree++; - level = tree & -tree; - continue; - } - w = -(p_st.x * tg.x + p_st.y * tg.y) / w; - w = saturate(w); - - /* compute u on the curve segment */ - u = i_st * (1 - w) + i_en * w; - r_curr = r_st + (r_en - r_st) * u; - /* compare x-y distances */ - float3 p_curr = ((curve_coef[3] * u + curve_coef[2]) * u + curve_coef[1]) * u + curve_coef[0]; - - float3 dp_st = (3 * curve_coef[3] * i_st + 2 * curve_coef[2]) * i_st + curve_coef[1]; - if(dot(tg, dp_st)< 0) - dp_st *= -1; - if(dot(dp_st, -p_st) + p_curr.z * dp_st.z < 0) { - tree++; - level = tree & -tree; - continue; - } - float3 dp_en = (3 * curve_coef[3] * i_en + 2 * curve_coef[2]) * i_en + curve_coef[1]; - if(dot(tg, dp_en) < 0) - dp_en *= -1; - if(dot(dp_en, p_en) - p_curr.z * dp_en.z < 0) { - tree++; - level = tree & -tree; - continue; - } - - /* compute coverage */ - float r_ext = r_curr; - coverage = 1.0f; - if(difl != 0.0f) { - mw_extension = min(difl * fabsf(bmaxz), extmax); - r_ext = mw_extension + r_curr; - float d = sqrtf(p_curr.x * p_curr.x + p_curr.y * p_curr.y); - float d0 = d - r_curr; - float d1 = d + r_curr; - float inv_mw_extension = 1.0f/mw_extension; - if(d0 >= 0) - coverage = (min(d1 * inv_mw_extension, 1.0f) - min(d0 * inv_mw_extension, 1.0f)) * 0.5f; - else // inside - coverage = (min(d1 * inv_mw_extension, 1.0f) + min(-d0 * inv_mw_extension, 1.0f)) * 0.5f; - } - - if(p_curr.x * p_curr.x + p_curr.y * p_curr.y >= r_ext * r_ext || p_curr.z <= epsilon || isect->t < p_curr.z) { - tree++; - level = tree & -tree; - continue; - } - - t = p_curr.z; - - /* stochastic fade from minimum width */ - if(difl != 0.0f && lcg_state) { - if(coverage != 1.0f && (lcg_step_float(lcg_state) > coverage)) - return hit; - } - } - else { - float l = len(p_en - p_st); - /* minimum width extension */ - float or1 = r1; - float or2 = r2; - - if(difl != 0.0f) { - mw_extension = min(len(p_st - P) * difl, extmax); - or1 = r1 < mw_extension ? mw_extension : r1; - mw_extension = min(len(p_en - P) * difl, extmax); - or2 = r2 < mw_extension ? mw_extension : r2; - } - /* --- */ - float invl = 1.0f/l; - float3 tg = (p_en - p_st) * invl; - gd = (or2 - or1) * invl; - float difz = -dot(p_st,tg); - float cyla = 1.0f - (tg.z * tg.z * (1 + gd*gd)); - float invcyla = 1.0f/cyla; - float halfb = (-p_st.z - tg.z*(difz + gd*(difz*gd + or1))); - float tcentre = -halfb*invcyla; - float zcentre = difz + (tg.z * tcentre); - float3 tdif = - p_st; - tdif.z += tcentre; - float tdifz = dot(tdif,tg); - float tb = 2*(tdif.z - tg.z*(tdifz + gd*(tdifz*gd + or1))); - float tc = dot(tdif,tdif) - tdifz * tdifz * (1 + gd*gd) - or1*or1 - 2*or1*tdifz*gd; - float td = tb*tb - 4*cyla*tc; - if(td < 0.0f) { - tree++; - level = tree & -tree; - continue; - } - - float rootd = sqrtf(td); - float correction = (-tb - rootd) * 0.5f * invcyla; - t = tcentre + correction; - - float3 dp_st = (3 * curve_coef[3] * i_st + 2 * curve_coef[2]) * i_st + curve_coef[1]; - if(dot(tg, dp_st)< 0) - dp_st *= -1; - float3 dp_en = (3 * curve_coef[3] * i_en + 2 * curve_coef[2]) * i_en + curve_coef[1]; - if(dot(tg, dp_en) < 0) - dp_en *= -1; - - if(flags & CURVE_KN_BACKFACING && (dot(dp_st, -p_st) + t * dp_st.z < 0 || dot(dp_en, p_en) - t * dp_en.z < 0 || isect->t < t || t <= 0.0f)) { - correction = (-tb + rootd) * 0.5f * invcyla; - t = tcentre + correction; - } - - if(dot(dp_st, -p_st) + t * dp_st.z < 0 || dot(dp_en, p_en) - t * dp_en.z < 0 || isect->t < t || t <= 0.0f) { - tree++; - level = tree & -tree; - continue; - } - - float w = (zcentre + (tg.z * correction)) * invl; - w = saturate(w); - /* compute u on the curve segment */ - u = i_st * (1 - w) + i_en * w; - - /* stochastic fade from minimum width */ - if(difl != 0.0f && lcg_state) { - r_curr = r1 + (r2 - r1) * w; - r_ext = or1 + (or2 - or1) * w; - coverage = r_curr/r_ext; - - if(coverage != 1.0f && (lcg_step_float(lcg_state) > coverage)) - return hit; - } - } - /* we found a new intersection */ - -#ifdef __VISIBILITY_FLAG__ - /* visibility flag test. we do it here under the assumption - * that most triangles are culled by node flags */ - if(kernel_tex_fetch(__prim_visibility, curveAddr) & visibility) -#endif - { - /* record intersection */ - isect->t = t; - isect->u = u; - isect->v = gd; - isect->prim = curveAddr; - isect->object = object; - isect->type = type; - hit = true; - } - - tree++; - level = tree & -tree; - } - else { - /* split the curve into two curves and process */ - level = level >> 1; - } - } - - return hit; -} - -ccl_device_forceinline bool bvh_curve_intersect(KernelGlobals *kg, Intersection *isect, - float3 P, float3 direction, uint visibility, int object, int curveAddr, float time, int type, uint *lcg_state, float difl, float extmax) -{ - /* define few macros to minimize code duplication for SSE */ -#ifndef __KERNEL_SSE2__ -# define len3_squared(x) len_squared(x) -# define len3(x) len(x) -# define dot3(x, y) dot(x, y) -#endif - - int segment = PRIMITIVE_UNPACK_SEGMENT(type); - /* curve Intersection check */ - int flags = kernel_data.curve.curveflags; - - int prim = kernel_tex_fetch(__prim_index, curveAddr); - float4 v00 = kernel_tex_fetch(__curves, prim); - - int cnum = __float_as_int(v00.x); - int k0 = cnum + segment; - int k1 = k0 + 1; - -#ifndef __KERNEL_SSE2__ - float4 P_curve[2]; - - if(type & PRIMITIVE_CURVE) { - P_curve[0] = kernel_tex_fetch(__curve_keys, k0); - P_curve[1] = kernel_tex_fetch(__curve_keys, k1); - } - else { - int fobject = (object == OBJECT_NONE)? kernel_tex_fetch(__prim_object, curveAddr): object; - motion_curve_keys(kg, fobject, prim, time, k0, k1, P_curve); - } - - float or1 = P_curve[0].w; - float or2 = P_curve[1].w; - float3 p1 = float4_to_float3(P_curve[0]); - float3 p2 = float4_to_float3(P_curve[1]); - - /* minimum width extension */ - float r1 = or1; - float r2 = or2; - float3 dif = P - p1; - float3 dif_second = P - p2; - if(difl != 0.0f) { - float pixelsize = min(len3(dif) * difl, extmax); - r1 = or1 < pixelsize ? pixelsize : or1; - pixelsize = min(len3(dif_second) * difl, extmax); - r2 = or2 < pixelsize ? pixelsize : or2; - } - /* --- */ - - float3 p21_diff = p2 - p1; - float3 sphere_dif1 = (dif + dif_second) * 0.5f; - float3 dir = direction; - float sphere_b_tmp = dot3(dir, sphere_dif1); - float3 sphere_dif2 = sphere_dif1 - sphere_b_tmp * dir; -#else - ssef P_curve[2]; - - if(type & PRIMITIVE_CURVE) { - P_curve[0] = load4f(&kg->__curve_keys.data[k0].x); - P_curve[1] = load4f(&kg->__curve_keys.data[k1].x); - } - else { - int fobject = (object == OBJECT_NONE)? kernel_tex_fetch(__prim_object, curveAddr): object; - motion_curve_keys(kg, fobject, prim, time, k0, k1, (float4*)&P_curve); - } - - const ssef or12 = shuffle<3, 3, 3, 3>(P_curve[0], P_curve[1]); - - ssef r12 = or12; - const ssef vP = load4f(P); - const ssef dif = vP - P_curve[0]; - const ssef dif_second = vP - P_curve[1]; - if(difl != 0.0f) { - const ssef len1_sq = len3_squared_splat(dif); - const ssef len2_sq = len3_squared_splat(dif_second); - const ssef len12 = mm_sqrt(shuffle<0, 0, 0, 0>(len1_sq, len2_sq)); - const ssef pixelsize12 = min(len12 * difl, ssef(extmax)); - r12 = max(or12, pixelsize12); - } - float or1 = extract<0>(or12), or2 = extract<0>(shuffle<2>(or12)); - float r1 = extract<0>(r12), r2 = extract<0>(shuffle<2>(r12)); - - const ssef p21_diff = P_curve[1] - P_curve[0]; - const ssef sphere_dif1 = (dif + dif_second) * 0.5f; - const ssef dir = load4f(direction); - const ssef sphere_b_tmp = dot3_splat(dir, sphere_dif1); - const ssef sphere_dif2 = nmadd(sphere_b_tmp, dir, sphere_dif1); -#endif - - float mr = max(r1, r2); - float l = len3(p21_diff); - float invl = 1.0f / l; - float sp_r = mr + 0.5f * l; - - float sphere_b = dot3(dir, sphere_dif2); - float sdisc = sphere_b * sphere_b - len3_squared(sphere_dif2) + sp_r * sp_r; - - if(sdisc < 0.0f) - return false; - - /* obtain parameters and test midpoint distance for suitable modes */ -#ifndef __KERNEL_SSE2__ - float3 tg = p21_diff * invl; -#else - const ssef tg = p21_diff * invl; -#endif - float gd = (r2 - r1) * invl; - - float dirz = dot3(dir, tg); - float difz = dot3(dif, tg); - - float a = 1.0f - (dirz*dirz*(1 + gd*gd)); - - float halfb = dot3(dir, dif) - dirz*(difz + gd*(difz*gd + r1)); - - float tcentre = -halfb/a; - float zcentre = difz + (dirz * tcentre); - - if((tcentre > isect->t) && !(flags & CURVE_KN_ACCURATE)) - return false; - if((zcentre < 0 || zcentre > l) && !(flags & CURVE_KN_ACCURATE) && !(flags & CURVE_KN_INTERSECTCORRECTION)) - return false; - - /* test minimum separation */ -#ifndef __KERNEL_SSE2__ - float3 cprod = cross(tg, dir); - float cprod2sq = len3_squared(cross(tg, dif)); -#else - const ssef cprod = cross(tg, dir); - float cprod2sq = len3_squared(cross_zxy(tg, dif)); -#endif - float cprodsq = len3_squared(cprod); - float distscaled = dot3(cprod, dif); - - if(cprodsq == 0) - distscaled = cprod2sq; - else - distscaled = (distscaled*distscaled)/cprodsq; - - if(distscaled > mr*mr) - return false; - - /* calculate true intersection */ -#ifndef __KERNEL_SSE2__ - float3 tdif = dif + tcentre * dir; -#else - const ssef tdif = madd(ssef(tcentre), dir, dif); -#endif - float tdifz = dot3(tdif, tg); - float tdifma = tdifz*gd + r1; - float tb = 2*(dot3(dir, tdif) - dirz*(tdifz + gd*tdifma)); - float tc = dot3(tdif, tdif) - tdifz*tdifz - tdifma*tdifma; - float td = tb*tb - 4*a*tc; - - if(td < 0.0f) - return false; - - float rootd = 0.0f; - float correction = 0.0f; - if(flags & CURVE_KN_ACCURATE) { - rootd = sqrtf(td); - correction = ((-tb - rootd)/(2*a)); - } - - float t = tcentre + correction; - - if(t < isect->t) { - - if(flags & CURVE_KN_INTERSECTCORRECTION) { - rootd = sqrtf(td); - correction = ((-tb - rootd)/(2*a)); - t = tcentre + correction; - } - - float z = zcentre + (dirz * correction); - // bool backface = false; - - if(flags & CURVE_KN_BACKFACING && (t < 0.0f || z < 0 || z > l)) { - // backface = true; - correction = ((-tb + rootd)/(2*a)); - t = tcentre + correction; - z = zcentre + (dirz * correction); - } - - /* stochastic fade from minimum width */ - float adjradius = or1 + z * (or2 - or1) * invl; - adjradius = adjradius / (r1 + z * gd); - if(lcg_state && adjradius != 1.0f) { - if(lcg_step_float(lcg_state) > adjradius) - return false; - } - /* --- */ - - if(t > 0.0f && t < isect->t && z >= 0 && z <= l) { - - if(flags & CURVE_KN_ENCLOSEFILTER) { - float enc_ratio = 1.01f; - if((difz > -r1 * enc_ratio) && (dot3(dif_second, tg) < r2 * enc_ratio)) { - float a2 = 1.0f - (dirz*dirz*(1 + gd*gd*enc_ratio*enc_ratio)); - float c2 = dot3(dif, dif) - difz * difz * (1 + gd*gd*enc_ratio*enc_ratio) - r1*r1*enc_ratio*enc_ratio - 2*r1*difz*gd*enc_ratio; - if(a2*c2 < 0.0f) - return false; - } - } - -#ifdef __VISIBILITY_FLAG__ - /* visibility flag test. we do it here under the assumption - * that most triangles are culled by node flags */ - if(kernel_tex_fetch(__prim_visibility, curveAddr) & visibility) -#endif - { - /* record intersection */ - isect->t = t; - isect->u = z*invl; - isect->v = gd; - isect->prim = curveAddr; - isect->object = object; - isect->type = type; - - return true; - } - } - } - - return false; - -#ifndef __KERNEL_SSE2__ -# undef len3_squared -# undef len3 -# undef dot3 -# endif -} - -ccl_device_inline float3 curvetangent(float t, float3 p0, float3 p1, float3 p2, float3 p3) -{ - float fc = 0.71f; - float data[4]; - float t2 = t * t; - data[0] = -3.0f * fc * t2 + 4.0f * fc * t - fc; - data[1] = 3.0f * (2.0f - fc) * t2 + 2.0f * (fc - 3.0f) * t; - data[2] = 3.0f * (fc - 2.0f) * t2 + 2.0f * (3.0f - 2.0f * fc) * t + fc; - data[3] = 3.0f * fc * t2 - 2.0f * fc * t; - return data[0] * p0 + data[1] * p1 + data[2] * p2 + data[3] * p3; -} - -ccl_device_inline float3 curvepoint(float t, float3 p0, float3 p1, float3 p2, float3 p3) -{ - float data[4]; - float fc = 0.71f; - float t2 = t * t; - float t3 = t2 * t; - data[0] = -fc * t3 + 2.0f * fc * t2 - fc * t; - data[1] = (2.0f - fc) * t3 + (fc - 3.0f) * t2 + 1.0f; - data[2] = (fc - 2.0f) * t3 + (3.0f - 2.0f * fc) * t2 + fc * t; - data[3] = fc * t3 - fc * t2; - return data[0] * p0 + data[1] * p1 + data[2] * p2 + data[3] * p3; -} - -ccl_device_inline float3 bvh_curve_refine(KernelGlobals *kg, ShaderData *sd, const Intersection *isect, const Ray *ray) -{ - int flag = kernel_data.curve.curveflags; - float t = isect->t; - float3 P = ray->P; - float3 D = ray->D; - - if(isect->object != OBJECT_NONE) { -#ifdef __OBJECT_MOTION__ - Transform tfm = ccl_fetch(sd, ob_itfm); -#else - Transform tfm = object_fetch_transform(kg, isect->object, OBJECT_INVERSE_TRANSFORM); -#endif - - P = transform_point(&tfm, P); - D = transform_direction(&tfm, D*t); - D = normalize_len(D, &t); - } - - int prim = kernel_tex_fetch(__prim_index, isect->prim); - float4 v00 = kernel_tex_fetch(__curves, prim); - - int k0 = __float_as_int(v00.x) + PRIMITIVE_UNPACK_SEGMENT(ccl_fetch(sd, type)); - int k1 = k0 + 1; - - float3 tg; - - if(flag & CURVE_KN_INTERPOLATE) { - int ka = max(k0 - 1,__float_as_int(v00.x)); - int kb = min(k1 + 1,__float_as_int(v00.x) + __float_as_int(v00.y) - 1); - - float4 P_curve[4]; - - if(ccl_fetch(sd, type) & PRIMITIVE_CURVE) { - P_curve[0] = kernel_tex_fetch(__curve_keys, ka); - P_curve[1] = kernel_tex_fetch(__curve_keys, k0); - P_curve[2] = kernel_tex_fetch(__curve_keys, k1); - P_curve[3] = kernel_tex_fetch(__curve_keys, kb); - } - else { - motion_cardinal_curve_keys(kg, ccl_fetch(sd, object), ccl_fetch(sd, prim), ccl_fetch(sd, time), ka, k0, k1, kb, P_curve); - } - - float3 p[4]; - p[0] = float4_to_float3(P_curve[0]); - p[1] = float4_to_float3(P_curve[1]); - p[2] = float4_to_float3(P_curve[2]); - p[3] = float4_to_float3(P_curve[3]); - - P = P + D*t; - -#ifdef __UV__ - ccl_fetch(sd, u) = isect->u; - ccl_fetch(sd, v) = 0.0f; -#endif - - tg = normalize(curvetangent(isect->u, p[0], p[1], p[2], p[3])); - - if(kernel_data.curve.curveflags & CURVE_KN_RIBBONS) { - ccl_fetch(sd, Ng) = normalize(-(D - tg * (dot(tg, D)))); - } - else { - /* direction from inside to surface of curve */ - float3 p_curr = curvepoint(isect->u, p[0], p[1], p[2], p[3]); - ccl_fetch(sd, Ng) = normalize(P - p_curr); - - /* adjustment for changing radius */ - float gd = isect->v; - - if(gd != 0.0f) { - ccl_fetch(sd, Ng) = ccl_fetch(sd, Ng) - gd * tg; - ccl_fetch(sd, Ng) = normalize(ccl_fetch(sd, Ng)); - } - } - - /* todo: sometimes the normal is still so that this is detected as - * backfacing even if cull backfaces is enabled */ - - ccl_fetch(sd, N) = ccl_fetch(sd, Ng); - } - else { - float4 P_curve[2]; - - if(ccl_fetch(sd, type) & PRIMITIVE_CURVE) { - P_curve[0]= kernel_tex_fetch(__curve_keys, k0); - P_curve[1]= kernel_tex_fetch(__curve_keys, k1); - } - else { - motion_curve_keys(kg, ccl_fetch(sd, object), ccl_fetch(sd, prim), ccl_fetch(sd, time), k0, k1, P_curve); - } - - float l = 1.0f; - tg = normalize_len(float4_to_float3(P_curve[1] - P_curve[0]), &l); - - P = P + D*t; - - float3 dif = P - float4_to_float3(P_curve[0]); - -#ifdef __UV__ - ccl_fetch(sd, u) = dot(dif,tg)/l; - ccl_fetch(sd, v) = 0.0f; -#endif - - if(flag & CURVE_KN_TRUETANGENTGNORMAL) { - ccl_fetch(sd, Ng) = -(D - tg * dot(tg, D)); - ccl_fetch(sd, Ng) = normalize(ccl_fetch(sd, Ng)); - } - else { - float gd = isect->v; - - /* direction from inside to surface of curve */ - ccl_fetch(sd, Ng) = (dif - tg * ccl_fetch(sd, u) * l) / (P_curve[0].w + ccl_fetch(sd, u) * l * gd); - - /* adjustment for changing radius */ - if(gd != 0.0f) { - ccl_fetch(sd, Ng) = ccl_fetch(sd, Ng) - gd * tg; - ccl_fetch(sd, Ng) = normalize(ccl_fetch(sd, Ng)); - } - } - - ccl_fetch(sd, N) = ccl_fetch(sd, Ng); - } - -#ifdef __DPDU__ - /* dPdu/dPdv */ - ccl_fetch(sd, dPdu) = tg; - ccl_fetch(sd, dPdv) = cross(tg, ccl_fetch(sd, Ng)); -#endif - - if(isect->object != OBJECT_NONE) { -#ifdef __OBJECT_MOTION__ - Transform tfm = ccl_fetch(sd, ob_tfm); -#else - Transform tfm = object_fetch_transform(kg, isect->object, OBJECT_TRANSFORM); -#endif - - P = transform_point(&tfm, P); - } - - return P; -} - -#endif +#endif /* __HAIR__ */ CCL_NAMESPACE_END - |