forked from bartvdbraak/blender
da376e0237
Cycles uses code from some great open source projects, many thanks them: * BVH building and traversal code from NVidia's "Understanding the Efficiency of Ray Traversal on GPUs": http://code.google.com/p/understanding-the-efficiency-of-ray-traversal-on-gpus/ * Open Shading Language for a large part of the shading system: http://code.google.com/p/openshadinglanguage/ * Blender for procedural textures and a few other nodes. * Approximate Catmull Clark subdivision from NVidia Mesh tools: http://code.google.com/p/nvidia-mesh-tools/ * Sobol direction vectors from: http://web.maths.unsw.edu.au/~fkuo/sobol/ * Film response functions from: http://www.cs.columbia.edu/CAVE/software/softlib/dorf.php
184 lines
6.5 KiB
C
184 lines
6.5 KiB
C
/*
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* Copyright 2011, Blender Foundation.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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CCL_NAMESPACE_BEGIN
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/* Point on triangle for Moller-Trumbore triangles */
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__device_inline float3 triangle_point_MT(KernelGlobals *kg, int tri_index, float u, float v)
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{
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/* load triangle vertices */
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float3 tri_vindex = as_float3(kernel_tex_fetch(__tri_vindex, tri_index));
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float3 v0 = as_float3(kernel_tex_fetch(__tri_verts, __float_as_int(tri_vindex.x)));
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float3 v1 = as_float3(kernel_tex_fetch(__tri_verts, __float_as_int(tri_vindex.y)));
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float3 v2 = as_float3(kernel_tex_fetch(__tri_verts, __float_as_int(tri_vindex.z)));
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/* compute point */
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float t = 1.0f - u - v;
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return (u*v0 + v*v1 + t*v2);
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}
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/* Sample point on triangle */
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__device_inline float3 triangle_sample_MT(KernelGlobals *kg, int tri_index, float randu, float randv)
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{
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/* compute point */
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randu = sqrtf(randu);
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float u = 1.0f - randu;
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float v = randv*randu;
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return triangle_point_MT(kg, tri_index, u, v);
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}
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/* Normal for Moller-Trumbore triangles */
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__device_inline float3 triangle_normal_MT(KernelGlobals *kg, int tri_index, int *shader)
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{
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#if 0
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/* load triangle vertices */
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float3 tri_vindex = as_float3(kernel_tex_fetch(__tri_vindex, tri_index));
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float3 v0 = as_float3(kernel_tex_fetch(__tri_verts, __float_as_int(tri_vindex.x)));
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float3 v1 = as_float3(kernel_tex_fetch(__tri_verts, __float_as_int(tri_vindex.y)));
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float3 v2 = as_float3(kernel_tex_fetch(__tri_verts, __float_as_int(tri_vindex.z)));
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/* compute normal */
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return normalize(cross(v2 - v0, v1 - v0));
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#else
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float4 Nm = kernel_tex_fetch(__tri_normal, tri_index);
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*shader = __float_as_int(Nm.w);
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return make_float3(Nm.x, Nm.y, Nm.z);
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#endif
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}
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__device_inline float3 triangle_smooth_normal(KernelGlobals *kg, int tri_index, float u, float v)
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{
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/* load triangle vertices */
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float3 tri_vindex = as_float3(kernel_tex_fetch(__tri_vindex, tri_index));
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float3 n0 = as_float3(kernel_tex_fetch(__tri_vnormal, __float_as_int(tri_vindex.x)));
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float3 n1 = as_float3(kernel_tex_fetch(__tri_vnormal, __float_as_int(tri_vindex.y)));
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float3 n2 = as_float3(kernel_tex_fetch(__tri_vnormal, __float_as_int(tri_vindex.z)));
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return normalize((1.0f - u - v)*n2 + u*n0 + v*n1);
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}
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__device_inline void triangle_dPdudv(KernelGlobals *kg, float3 *dPdu, float3 *dPdv, int tri)
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{
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/* fetch triangle vertex coordinates */
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float3 tri_vindex = as_float3(kernel_tex_fetch(__tri_vindex, tri));
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float3 p0 = as_float3(kernel_tex_fetch(__tri_verts, __float_as_int(tri_vindex.x)));
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float3 p1 = as_float3(kernel_tex_fetch(__tri_verts, __float_as_int(tri_vindex.y)));
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float3 p2 = as_float3(kernel_tex_fetch(__tri_verts, __float_as_int(tri_vindex.z)));
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/* compute derivatives of P w.r.t. uv */
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*dPdu = (p0 - p2);
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*dPdv = (p1 - p2);
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}
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/* attributes */
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__device float triangle_attribute_float(KernelGlobals *kg, const ShaderData *sd, AttributeElement elem, int offset, float *dx, float *dy)
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{
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if(elem == ATTR_ELEMENT_FACE) {
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if(dx) *dx = 0.0f;
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if(dy) *dy = 0.0f;
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return kernel_tex_fetch(__attributes_float, offset + sd->prim);
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}
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else if(elem == ATTR_ELEMENT_VERTEX) {
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float3 tri_vindex = as_float3(kernel_tex_fetch(__tri_vindex, sd->prim));
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float f0 = kernel_tex_fetch(__attributes_float, offset + __float_as_int(tri_vindex.x));
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float f1 = kernel_tex_fetch(__attributes_float, offset + __float_as_int(tri_vindex.y));
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float f2 = kernel_tex_fetch(__attributes_float, offset + __float_as_int(tri_vindex.z));
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#ifdef __RAY_DIFFERENTIALS__
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if(dx) *dx = sd->du.dx*f0 + sd->dv.dx*f1 - (sd->du.dx + sd->dv.dx)*f2;
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if(dy) *dy = sd->du.dy*f0 + sd->dv.dy*f1 - (sd->du.dy + sd->dv.dy)*f2;
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#endif
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return sd->u*f0 + sd->v*f1 + (1.0f - sd->u - sd->v)*f2;
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}
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else if(elem == ATTR_ELEMENT_CORNER) {
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int tri = offset + sd->prim;
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float f0 = kernel_tex_fetch(__attributes_float, tri*3 + 0);
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float f1 = kernel_tex_fetch(__attributes_float, tri*3 + 1);
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float f2 = kernel_tex_fetch(__attributes_float, tri*3 + 2);
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#ifdef __RAY_DIFFERENTIALS__
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if(dx) *dx = sd->du.dx*f0 + sd->dv.dx*f1 - (sd->du.dx + sd->dv.dx)*f2;
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if(dy) *dy = sd->du.dy*f0 + sd->dv.dy*f1 - (sd->du.dy + sd->dv.dy)*f2;
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#endif
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return sd->u*f0 + sd->v*f1 + (1.0f - sd->u - sd->v)*f2;
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}
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else {
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if(dx) *dx = 0.0f;
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if(dy) *dy = 0.0f;
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return 0.0f;
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}
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}
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__device float3 triangle_attribute_float3(KernelGlobals *kg, const ShaderData *sd, AttributeElement elem, int offset, float3 *dx, float3 *dy)
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{
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if(elem == ATTR_ELEMENT_FACE) {
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if(dx) *dx = make_float3(0.0f, 0.0f, 0.0f);
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if(dy) *dy = make_float3(0.0f, 0.0f, 0.0f);
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return as_float3(kernel_tex_fetch(__attributes_float3, offset + sd->prim));
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}
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else if(elem == ATTR_ELEMENT_VERTEX) {
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float3 tri_vindex = as_float3(kernel_tex_fetch(__tri_vindex, sd->prim));
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float3 f0 = as_float3(kernel_tex_fetch(__attributes_float3, offset + __float_as_int(tri_vindex.x)));
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float3 f1 = as_float3(kernel_tex_fetch(__attributes_float3, offset + __float_as_int(tri_vindex.y)));
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float3 f2 = as_float3(kernel_tex_fetch(__attributes_float3, offset + __float_as_int(tri_vindex.z)));
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#ifdef __RAY_DIFFERENTIALS__
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if(dx) *dx = sd->du.dx*f0 + sd->dv.dx*f1 - (sd->du.dx + sd->dv.dx)*f2;
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if(dy) *dy = sd->du.dy*f0 + sd->dv.dy*f1 - (sd->du.dy + sd->dv.dy)*f2;
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#endif
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return sd->u*f0 + sd->v*f1 + (1.0f - sd->u - sd->v)*f2;
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}
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else if(elem == ATTR_ELEMENT_CORNER) {
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int tri = offset + sd->prim;
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float3 f0 = as_float3(kernel_tex_fetch(__attributes_float3, tri*3 + 0));
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float3 f1 = as_float3(kernel_tex_fetch(__attributes_float3, tri*3 + 1));
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float3 f2 = as_float3(kernel_tex_fetch(__attributes_float3, tri*3 + 2));
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#ifdef __RAY_DIFFERENTIALS__
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if(dx) *dx = sd->du.dx*f0 + sd->dv.dx*f1 - (sd->du.dx + sd->dv.dx)*f2;
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if(dy) *dy = sd->du.dy*f0 + sd->dv.dy*f1 - (sd->du.dy + sd->dv.dy)*f2;
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#endif
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return sd->u*f0 + sd->v*f1 + (1.0f - sd->u - sd->v)*f2;
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}
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else {
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if(dx) *dx = make_float3(0.0f, 0.0f, 0.0f);
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if(dy) *dy = make_float3(0.0f, 0.0f, 0.0f);
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return make_float3(0.0f, 0.0f, 0.0f);
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}
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}
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CCL_NAMESPACE_END
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