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Diffstat (limited to 'intern/cycles/kernel/closure/bsdf_ward.h')
| -rw-r--r-- | intern/cycles/kernel/closure/bsdf_ward.h | 189 |
1 files changed, 0 insertions, 189 deletions
diff --git a/intern/cycles/kernel/closure/bsdf_ward.h b/intern/cycles/kernel/closure/bsdf_ward.h deleted file mode 100644 index c9de615a011..00000000000 --- a/intern/cycles/kernel/closure/bsdf_ward.h +++ /dev/null @@ -1,189 +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. - */ - -#ifndef __BSDF_WARD_H__ -#define __BSDF_WARD_H__ - -CCL_NAMESPACE_BEGIN - -/* WARD */ - -ccl_device int bsdf_ward_setup(ShaderClosure *sc) -{ - sc->data0 = clamp(sc->data0, 1e-4f, 1.0f); /* m_ax */ - sc->data1 = clamp(sc->data1, 1e-4f, 1.0f); /* m_ay */ - - sc->type = CLOSURE_BSDF_WARD_ID; - return SD_BSDF|SD_BSDF_HAS_EVAL|SD_BSDF_GLOSSY; -} - -ccl_device void bsdf_ward_blur(ShaderClosure *sc, float roughness) -{ - sc->data0 = fmaxf(roughness, sc->data0); /* m_ax */ - sc->data1 = fmaxf(roughness, sc->data1); /* m_ay */ -} - -ccl_device float3 bsdf_ward_eval_reflect(const ShaderClosure *sc, const float3 I, const float3 omega_in, float *pdf) -{ - float m_ax = sc->data0; - float m_ay = sc->data1; - float3 N = sc->N; - float3 T = sc->T; - - float cosNO = dot(N, I); - float cosNI = dot(N, omega_in); - - if(cosNI > 0.0f && cosNO > 0.0f) { - cosNO = max(cosNO, 1e-4f); - cosNI = max(cosNI, 1e-4f); - - // get half vector and get x,y basis on the surface for anisotropy - float3 H = normalize(omega_in + I); // normalize needed for pdf - float3 X, Y; - make_orthonormals_tangent(N, T, &X, &Y); - // eq. 4 - float dotx = dot(H, X) / m_ax; - float doty = dot(H, Y) / m_ay; - float dotn = dot(H, N); - float exp_arg = (dotx * dotx + doty * doty) / (dotn * dotn); - float denom = (M_4PI_F * m_ax * m_ay * sqrtf(cosNO * cosNI)); - float exp_val = expf(-exp_arg); - float out = cosNI * exp_val / denom; - float oh = dot(H, I); - denom = M_4PI_F * m_ax * m_ay * oh * dotn * dotn * dotn; - *pdf = exp_val / denom; - return make_float3 (out, out, out); - } - - return make_float3 (0, 0, 0); -} - -ccl_device float3 bsdf_ward_eval_transmit(const ShaderClosure *sc, const float3 I, const float3 omega_in, float *pdf) -{ - return make_float3(0.0f, 0.0f, 0.0f); -} - -ccl_device int bsdf_ward_sample(const ShaderClosure *sc, float3 Ng, float3 I, float3 dIdx, float3 dIdy, float randu, float randv, float3 *eval, float3 *omega_in, float3 *domega_in_dx, float3 *domega_in_dy, float *pdf) -{ - float m_ax = sc->data0; - float m_ay = sc->data1; - float3 N = sc->N; - float3 T = sc->T; - - float cosNO = dot(N, I); - if(cosNO > 0.0f) { - // get x,y basis on the surface for anisotropy - float3 X, Y; - make_orthonormals_tangent(N, T, &X, &Y); - // generate random angles for the half vector - // eq. 7 (taking care around discontinuities to keep - //ttoutput angle in the right quadrant) - // we take advantage of cos(atan(x)) == 1/sqrt(1+x^2) - //tttt 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(M_PI_2_F * val); - cosPhi = 1 / sqrtf(1 + tanPhi * tanPhi); - sinPhi = tanPhi * cosPhi; - } - else if(randu < 0.5f) { - float val = 1 - 4 * (0.5f - randu); - float tanPhi = alphaRatio * tanf(M_PI_2_F * val); - // phi = M_PI_F - 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(M_PI_2_F * val); - //phi = M_PI_F + phi; - cosPhi = -1 / sqrtf(1 + tanPhi * tanPhi); - sinPhi = tanPhi * cosPhi; - } - else { - float val = 1 - 4 * (1 - randu); - float tanPhi = alphaRatio * tanf(M_PI_2_F * val); - // phi = M_2PI_F - phi; - cosPhi = 1 / sqrtf(1 + tanPhi * tanPhi); - sinPhi = -tanPhi * cosPhi; - } - // eq. 6 - // we take advantage of cos(atan(x)) == 1/sqrt(1+x^2) - //tttt 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); - - float3 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 * N; - // generate the final sample - float oh = dot(h, I); - *omega_in = 2.0f * oh * h - I; - if(dot(Ng, *omega_in) > 0) { - float cosNI = dot(N, *omega_in); - if(cosNI > 0) { - cosNO = max(cosNO, 1e-4f); - cosNI = max(cosNI, 1e-4f); - - // eq. 9 - float exp_arg = (dotx * dotx + doty * doty) / (dotn * dotn); - float denom = M_4PI_F * m_ax * m_ay * oh * dotn * dotn * dotn; - *pdf = expf(-exp_arg) / denom; - // compiler will reuse expressions already computed - denom = (M_4PI_F * m_ax * m_ay * sqrtf(cosNO * cosNI)); - float power = cosNI * expf(-exp_arg) / denom; - *eval = make_float3(power, power, power); -#ifdef __RAY_DIFFERENTIALS__ - *domega_in_dx = (2 * dot(N, dIdx)) * N - dIdx; - *domega_in_dy = (2 * dot(N, dIdy)) * N - dIdy; -#endif - } - } - } - return LABEL_REFLECT|LABEL_GLOSSY; -} - -CCL_NAMESPACE_END - -#endif /* __BSDF_WARD_H__ */ - |