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Diffstat (limited to 'intern/cycles/kernel/osl/bsdf_ward.cpp')
| -rw-r--r-- | intern/cycles/kernel/osl/bsdf_ward.cpp | 230 |
1 files changed, 0 insertions, 230 deletions
diff --git a/intern/cycles/kernel/osl/bsdf_ward.cpp b/intern/cycles/kernel/osl/bsdf_ward.cpp deleted file mode 100644 index 9d8d2fc4b76..00000000000 --- a/intern/cycles/kernel/osl/bsdf_ward.cpp +++ /dev/null @@ -1,230 +0,0 @@ -/* - * Adapted from Open Shading Language with this license: - * - * Copyright (c) 2009-2010 Sony Pictures Imageworks Inc., et al. - * All Rights Reserved. - * - * Modifications Copyright 2011, Blender Foundation. - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions are - * met: - * * Redistributions of source code must retain the above copyright - * notice, this list of conditions and the following disclaimer. - * * Redistributions in binary form must reproduce the above copyright - * notice, this list of conditions and the following disclaimer in the - * documentation and/or other materials provided with the distribution. - * * Neither the name of Sony Pictures Imageworks nor the names of its - * contributors may be used to endorse or promote products derived from - * this software without specific prior written permission. - * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS - * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT - * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR - * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT - * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, - * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT - * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, - * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY - * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT - * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE - * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. - */ - -#include <OpenImageIO/fmath.h> - -#include <OSL/genclosure.h> - -#include "osl_closures.h" - -#include "util_math.h" - -CCL_NAMESPACE_BEGIN - -using namespace OSL; - -// anisotropic ward - leaks energy at grazing angles -// see http://www.graphics.cornell.edu/~bjw/wardnotes.pdf -class WardClosure : public BSDFClosure { -public: - Vec3 m_N; - Vec3 m_T; - float m_ax, m_ay; - WardClosure() : BSDFClosure(Labels::GLOSSY) {} - - void setup() - { - m_ax = clamp(m_ax, 1e-5f, 1.0f); - m_ay = clamp(m_ay, 1e-5f, 1.0f); - } - - bool mergeable(const ClosurePrimitive *other) const { - const WardClosure *comp = (const WardClosure *)other; - return m_N == comp->m_N && m_T == comp->m_T && - m_ax == comp->m_ax && m_ay == comp->m_ay && - BSDFClosure::mergeable(other); - } - - size_t memsize() const { return sizeof(*this); } - - const char *name() const { return "ward"; } - - void print_on(std::ostream &out) const { - out << name() << " (("; - out << m_N[0] << ", " << m_N[1] << ", " << m_N[2] << "), ("; - out << m_T[0] << ", " << m_T[1] << ", " << m_T[2] << "), "; - out << m_ax << ", " << m_ay << ")"; - } - - float albedo(const Vec3 &omega_out) const - { - return 1.0f; - } - - Color3 eval_reflect(const Vec3 &omega_out, const Vec3 &omega_in, float& pdf) const - { - float cosNO = m_N.dot(omega_out); - float cosNI = m_N.dot(omega_in); - if (cosNI > 0 && cosNO > 0) { - // get half vector and get x,y basis on the surface for anisotropy - Vec3 H = omega_in + omega_out; - H.normalize(); // normalize needed for pdf - Vec3 X, Y; - make_orthonormals(m_N, m_T, X, Y); - // eq. 4 - float dotx = H.dot(X) / m_ax; - float doty = H.dot(Y) / m_ay; - float dotn = H.dot(m_N); - float exp_arg = (dotx * dotx + doty * doty) / (dotn * dotn); - float denom = (4 * (float) M_PI * m_ax * m_ay * sqrtf(cosNO * cosNI)); - float exp_val = expf(-exp_arg); - float out = cosNI * exp_val / denom; - float oh = H.dot(omega_out); - denom = 4 * (float) M_PI * m_ax * m_ay * oh * dotn * dotn * dotn; - pdf = exp_val / denom; - return Color3(out, out, out); - } - return Color3(0, 0, 0); - } - - Color3 eval_transmit(const Vec3 &omega_out, const Vec3 &omega_in, float& pdf) const - { - return Color3(0, 0, 0); - } - - ustring sample(const Vec3 &Ng, - const Vec3 &omega_out, const Vec3 &domega_out_dx, const Vec3 &domega_out_dy, - float randu, float randv, - Vec3 &omega_in, Vec3 &domega_in_dx, Vec3 &domega_in_dy, - float &pdf, Color3 &eval) const - { - float cosNO = m_N.dot(omega_out); - if (cosNO > 0) { - // get x,y basis on the surface for anisotropy - Vec3 X, Y; - make_orthonormals(m_N, m_T, X, Y); - // generate random angles for the half vector - // eq. 7 (taking care around discontinuities to keep - // output angle in the right quadrant) - // we take advantage of cos(atan(x)) == 1/sqrt(1+x^2) - // and sin(atan(x)) == x/sqrt(1+x^2) - float alphaRatio = m_ay / m_ax; - float cosPhi, sinPhi; - if (randu < 0.25f) { - float val = 4 * randu; - float tanPhi = alphaRatio * tanf((float) M_PI_2 * val); - cosPhi = 1 / sqrtf(1 + tanPhi * tanPhi); - sinPhi = tanPhi * cosPhi; - } - else if (randu < 0.5) { - float val = 1 - 4 * (0.5f - randu); - float tanPhi = alphaRatio * tanf((float) M_PI_2 * val); - // phi = (float) M_PI - phi; - cosPhi = -1 / sqrtf(1 + tanPhi * tanPhi); - sinPhi = -tanPhi * cosPhi; - } - else if (randu < 0.75f) { - float val = 4 * (randu - 0.5f); - float tanPhi = alphaRatio * tanf((float) M_PI_2 * val); - //phi = (float) M_PI + phi; - cosPhi = -1 / sqrtf(1 + tanPhi * tanPhi); - sinPhi = tanPhi * cosPhi; - } - else { - float val = 1 - 4 * (1 - randu); - float tanPhi = alphaRatio * tanf((float) M_PI_2 * val); - // phi = 2 * (float) M_PI - phi; - cosPhi = 1 / sqrtf(1 + tanPhi * tanPhi); - sinPhi = -tanPhi * cosPhi; - } - // eq. 6 - // we take advantage of cos(atan(x)) == 1/sqrt(1+x^2) - // and sin(atan(x)) == x/sqrt(1+x^2) - float thetaDenom = (cosPhi * cosPhi) / (m_ax * m_ax) + (sinPhi * sinPhi) / (m_ay * m_ay); - float tanTheta2 = -logf(1 - randv) / thetaDenom; - float cosTheta = 1 / sqrtf(1 + tanTheta2); - float sinTheta = cosTheta * sqrtf(tanTheta2); - - Vec3 h; // already normalized becaused expressed from spherical coordinates - h.x = sinTheta * cosPhi; - h.y = sinTheta * sinPhi; - h.z = cosTheta; - // compute terms that are easier in local space - float dotx = h.x / m_ax; - float doty = h.y / m_ay; - float dotn = h.z; - // transform to world space - h = h.x * X + h.y * Y + h.z * m_N; - // generate the final sample - float oh = h.dot(omega_out); - omega_in.x = 2 * oh * h.x - omega_out.x; - omega_in.y = 2 * oh * h.y - omega_out.y; - omega_in.z = 2 * oh * h.z - omega_out.z; - if (Ng.dot(omega_in) > 0) { - float cosNI = m_N.dot(omega_in); - if (cosNI > 0) { - // eq. 9 - float exp_arg = (dotx * dotx + doty * doty) / (dotn * dotn); - float denom = 4 * (float) M_PI * m_ax * m_ay * oh * dotn * dotn * dotn; - pdf = expf(-exp_arg) / denom; - // compiler will reuse expressions already computed - denom = (4 * (float) M_PI * m_ax * m_ay * sqrtf(cosNO * cosNI)); - float power = cosNI * expf(-exp_arg) / denom; - eval.setValue(power, power, power); - domega_in_dx = (2 * m_N.dot(domega_out_dx)) * m_N - domega_out_dx; - domega_in_dy = (2 * m_N.dot(domega_out_dy)) * m_N - domega_out_dy; - - /* disabled for now - gives texture filtering problems */ -#if 0 - // Since there is some blur to this reflection, make the - // derivatives a bit bigger. In theory this varies with the - // roughness but the exact relationship is complex and - // requires more ops than are practical. - domega_in_dx *= 10; - domega_in_dy *= 10; -#endif - } - } - } - return Labels::REFLECT; - } -}; - - - -ClosureParam *bsdf_ward_params() -{ - static ClosureParam params[] = { - CLOSURE_VECTOR_PARAM(WardClosure, m_N), - CLOSURE_VECTOR_PARAM(WardClosure, m_T), - CLOSURE_FLOAT_PARAM(WardClosure, m_ax), - CLOSURE_FLOAT_PARAM(WardClosure, m_ay), - CLOSURE_STRING_KEYPARAM("label"), - CLOSURE_FINISH_PARAM(WardClosure) - }; - return params; -} - -CLOSURE_PREPARE(bsdf_ward_prepare, WardClosure) - -CCL_NAMESPACE_END - |