b9ce231060
More information in this post: http://code.blender.org/ Thanks to all contributes for giving their permission!
193 lines
7.0 KiB
C
193 lines
7.0 KiB
C
/*
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* Copyright 2011-2013 Blender Foundation
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License
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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 = float4_to_float3(kernel_tex_fetch(__tri_vindex, tri_index));
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float3 v0 = float4_to_float3(kernel_tex_fetch(__tri_verts, __float_as_int(tri_vindex.x)));
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float3 v1 = float4_to_float3(kernel_tex_fetch(__tri_verts, __float_as_int(tri_vindex.y)));
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float3 v2 = float4_to_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 = float4_to_float3(kernel_tex_fetch(__tri_vindex, tri_index));
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float3 v0 = float4_to_float3(kernel_tex_fetch(__tri_verts, __float_as_int(tri_vindex.x)));
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float3 v1 = float4_to_float3(kernel_tex_fetch(__tri_verts, __float_as_int(tri_vindex.y)));
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float3 v2 = float4_to_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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/* Return 3 triangle vertex locations */
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__device_inline void triangle_vertices(KernelGlobals *kg, int tri_index, float3 P[3])
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{
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/* load triangle vertices */
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float3 tri_vindex = float4_to_float3(kernel_tex_fetch(__tri_vindex, tri_index));
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P[0] = float4_to_float3(kernel_tex_fetch(__tri_verts, __float_as_int(tri_vindex.x)));
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P[1] = float4_to_float3(kernel_tex_fetch(__tri_verts, __float_as_int(tri_vindex.y)));
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P[2] = float4_to_float3(kernel_tex_fetch(__tri_verts, __float_as_int(tri_vindex.z)));
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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 = float4_to_float3(kernel_tex_fetch(__tri_vindex, tri_index));
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float3 n0 = float4_to_float3(kernel_tex_fetch(__tri_vnormal, __float_as_int(tri_vindex.x)));
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float3 n1 = float4_to_float3(kernel_tex_fetch(__tri_vnormal, __float_as_int(tri_vindex.y)));
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float3 n2 = float4_to_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 = float4_to_float3(kernel_tex_fetch(__tri_vindex, tri));
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float3 p0 = float4_to_float3(kernel_tex_fetch(__tri_verts, __float_as_int(tri_vindex.x)));
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float3 p1 = float4_to_float3(kernel_tex_fetch(__tri_verts, __float_as_int(tri_vindex.y)));
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float3 p2 = float4_to_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 = float4_to_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*3;
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float f0 = kernel_tex_fetch(__attributes_float, tri + 0);
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float f1 = kernel_tex_fetch(__attributes_float, tri + 1);
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float f2 = kernel_tex_fetch(__attributes_float, tri + 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 float4_to_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 = float4_to_float3(kernel_tex_fetch(__tri_vindex, sd->prim));
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float3 f0 = float4_to_float3(kernel_tex_fetch(__attributes_float3, offset + __float_as_int(tri_vindex.x)));
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float3 f1 = float4_to_float3(kernel_tex_fetch(__attributes_float3, offset + __float_as_int(tri_vindex.y)));
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float3 f2 = float4_to_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*3;
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float3 f0 = float4_to_float3(kernel_tex_fetch(__attributes_float3, tri + 0));
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float3 f1 = float4_to_float3(kernel_tex_fetch(__attributes_float3, tri + 1));
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float3 f2 = float4_to_float3(kernel_tex_fetch(__attributes_float3, tri + 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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