forked from bartvdbraak/blender
Brecht Van Lommel
c18712e868
This to avoids build conflicts with libc++ on FreeBSD, these __ prefixed values are reserved for compilers. I apologize to anyone who has patches or branches and has to go through the pain of merging this change, it may be easiest to do these same replacements in your code and then apply/merge the patch. Ref T37477.
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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ccl_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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ccl_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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ccl_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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ccl_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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ccl_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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ccl_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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ccl_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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ccl_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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