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blender/intern/cycles/kernel/kernel_triangle.h
Brecht Van Lommel 1d8c798188 Cycles: support for motion vector and UV passes. 
Most of the changes are related to adding support for motion data throughout
the code. There's some code for actual camera/object motion blur raytracing
but it's unfinished (it badly slows down the raytracing kernel even when the
option is turned off), so that code it disabled still.

Motion vector export from Blender tries to avoid computing derived meshes
when the mesh does not have a deforming modifier, and it also won't store
motion vectors for every vertex if only the object or camera is moving.
2012-04-30 12:49:26 +00:00

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/*
* Copyright 2011, Blender Foundation.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
CCL_NAMESPACE_BEGIN
/* Point on triangle for Moller-Trumbore triangles */
__device_inline float3 triangle_point_MT(KernelGlobals *kg, int tri_index, float u, float v)
{
/* load triangle vertices */
float3 tri_vindex = float4_to_float3(kernel_tex_fetch(__tri_vindex, tri_index));
float3 v0 = float4_to_float3(kernel_tex_fetch(__tri_verts, __float_as_int(tri_vindex.x)));
float3 v1 = float4_to_float3(kernel_tex_fetch(__tri_verts, __float_as_int(tri_vindex.y)));
float3 v2 = float4_to_float3(kernel_tex_fetch(__tri_verts, __float_as_int(tri_vindex.z)));
/* compute point */
float t = 1.0f - u - v;
return (u*v0 + v*v1 + t*v2);
}
/* Sample point on triangle */
__device_inline float3 triangle_sample_MT(KernelGlobals *kg, int tri_index, float randu, float randv)
{
/* compute point */
randu = sqrtf(randu);
float u = 1.0f - randu;
float v = randv*randu;
return triangle_point_MT(kg, tri_index, u, v);
}
/* Normal for Moller-Trumbore triangles */
__device_inline float3 triangle_normal_MT(KernelGlobals *kg, int tri_index, int *shader)
{
#if 0
/* load triangle vertices */
float3 tri_vindex = float4_to_float3(kernel_tex_fetch(__tri_vindex, tri_index));
float3 v0 = float4_to_float3(kernel_tex_fetch(__tri_verts, __float_as_int(tri_vindex.x)));
float3 v1 = float4_to_float3(kernel_tex_fetch(__tri_verts, __float_as_int(tri_vindex.y)));
float3 v2 = float4_to_float3(kernel_tex_fetch(__tri_verts, __float_as_int(tri_vindex.z)));
/* compute normal */
return normalize(cross(v2 - v0, v1 - v0));
#else
float4 Nm = kernel_tex_fetch(__tri_normal, tri_index);
*shader = __float_as_int(Nm.w);
return make_float3(Nm.x, Nm.y, Nm.z);
#endif
}
__device_inline float3 triangle_smooth_normal(KernelGlobals *kg, int tri_index, float u, float v)
{
/* load triangle vertices */
float3 tri_vindex = float4_to_float3(kernel_tex_fetch(__tri_vindex, tri_index));
float3 n0 = float4_to_float3(kernel_tex_fetch(__tri_vnormal, __float_as_int(tri_vindex.x)));
float3 n1 = float4_to_float3(kernel_tex_fetch(__tri_vnormal, __float_as_int(tri_vindex.y)));
float3 n2 = float4_to_float3(kernel_tex_fetch(__tri_vnormal, __float_as_int(tri_vindex.z)));
return normalize((1.0f - u - v)*n2 + u*n0 + v*n1);
}
__device_inline void triangle_dPdudv(KernelGlobals *kg, float3 *dPdu, float3 *dPdv, int tri)
{
/* fetch triangle vertex coordinates */
float3 tri_vindex = float4_to_float3(kernel_tex_fetch(__tri_vindex, tri));
float3 p0 = float4_to_float3(kernel_tex_fetch(__tri_verts, __float_as_int(tri_vindex.x)));
float3 p1 = float4_to_float3(kernel_tex_fetch(__tri_verts, __float_as_int(tri_vindex.y)));
float3 p2 = float4_to_float3(kernel_tex_fetch(__tri_verts, __float_as_int(tri_vindex.z)));
/* compute derivatives of P w.r.t. uv */
*dPdu = (p0 - p2);
*dPdv = (p1 - p2);
}
/* attributes */
__device float triangle_attribute_float(KernelGlobals *kg, const ShaderData *sd, AttributeElement elem, int offset, float *dx, float *dy)
{
if(elem == ATTR_ELEMENT_FACE) {
if(dx) *dx = 0.0f;
if(dy) *dy = 0.0f;
return kernel_tex_fetch(__attributes_float, offset + sd->prim);
}
else if(elem == ATTR_ELEMENT_VERTEX) {
float3 tri_vindex = float4_to_float3(kernel_tex_fetch(__tri_vindex, sd->prim));
float f0 = kernel_tex_fetch(__attributes_float, offset + __float_as_int(tri_vindex.x));
float f1 = kernel_tex_fetch(__attributes_float, offset + __float_as_int(tri_vindex.y));
float f2 = kernel_tex_fetch(__attributes_float, offset + __float_as_int(tri_vindex.z));
#ifdef __RAY_DIFFERENTIALS__
if(dx) *dx = sd->du.dx*f0 + sd->dv.dx*f1 - (sd->du.dx + sd->dv.dx)*f2;
if(dy) *dy = sd->du.dy*f0 + sd->dv.dy*f1 - (sd->du.dy + sd->dv.dy)*f2;
#endif
return sd->u*f0 + sd->v*f1 + (1.0f - sd->u - sd->v)*f2;
}
else if(elem == ATTR_ELEMENT_CORNER) {
int tri = offset + sd->prim*3;
float f0 = kernel_tex_fetch(__attributes_float, tri + 0);
float f1 = kernel_tex_fetch(__attributes_float, tri + 1);
float f2 = kernel_tex_fetch(__attributes_float, tri + 2);
#ifdef __RAY_DIFFERENTIALS__
if(dx) *dx = sd->du.dx*f0 + sd->dv.dx*f1 - (sd->du.dx + sd->dv.dx)*f2;
if(dy) *dy = sd->du.dy*f0 + sd->dv.dy*f1 - (sd->du.dy + sd->dv.dy)*f2;
#endif
return sd->u*f0 + sd->v*f1 + (1.0f - sd->u - sd->v)*f2;
}
else {
if(dx) *dx = 0.0f;
if(dy) *dy = 0.0f;
return 0.0f;
}
}
__device float3 triangle_attribute_float3(KernelGlobals *kg, const ShaderData *sd, AttributeElement elem, int offset, float3 *dx, float3 *dy)
{
if(elem == ATTR_ELEMENT_FACE) {
if(dx) *dx = make_float3(0.0f, 0.0f, 0.0f);
if(dy) *dy = make_float3(0.0f, 0.0f, 0.0f);
return float4_to_float3(kernel_tex_fetch(__attributes_float3, offset + sd->prim));
}
else if(elem == ATTR_ELEMENT_VERTEX) {
float3 tri_vindex = float4_to_float3(kernel_tex_fetch(__tri_vindex, sd->prim));
float3 f0 = float4_to_float3(kernel_tex_fetch(__attributes_float3, offset + __float_as_int(tri_vindex.x)));
float3 f1 = float4_to_float3(kernel_tex_fetch(__attributes_float3, offset + __float_as_int(tri_vindex.y)));
float3 f2 = float4_to_float3(kernel_tex_fetch(__attributes_float3, offset + __float_as_int(tri_vindex.z)));
#ifdef __RAY_DIFFERENTIALS__
if(dx) *dx = sd->du.dx*f0 + sd->dv.dx*f1 - (sd->du.dx + sd->dv.dx)*f2;
if(dy) *dy = sd->du.dy*f0 + sd->dv.dy*f1 - (sd->du.dy + sd->dv.dy)*f2;
#endif
return sd->u*f0 + sd->v*f1 + (1.0f - sd->u - sd->v)*f2;
}
else if(elem == ATTR_ELEMENT_CORNER) {
int tri = offset + sd->prim*3;
float3 f0 = float4_to_float3(kernel_tex_fetch(__attributes_float3, tri + 0));
float3 f1 = float4_to_float3(kernel_tex_fetch(__attributes_float3, tri + 1));
float3 f2 = float4_to_float3(kernel_tex_fetch(__attributes_float3, tri + 2));
#ifdef __RAY_DIFFERENTIALS__
if(dx) *dx = sd->du.dx*f0 + sd->dv.dx*f1 - (sd->du.dx + sd->dv.dx)*f2;
if(dy) *dy = sd->du.dy*f0 + sd->dv.dy*f1 - (sd->du.dy + sd->dv.dy)*f2;
#endif
return sd->u*f0 + sd->v*f1 + (1.0f - sd->u - sd->v)*f2;
}
else {
if(dx) *dx = make_float3(0.0f, 0.0f, 0.0f);
if(dy) *dy = make_float3(0.0f, 0.0f, 0.0f);
return make_float3(0.0f, 0.0f, 0.0f);
}
}
/* motion */
__device int triangle_find_attribute(KernelGlobals *kg, ShaderData *sd, uint id)
{
/* find attribute by unique id */
uint attr_offset = sd->object*kernel_data.bvh.attributes_map_stride;
uint4 attr_map = kernel_tex_fetch(__attributes_map, attr_offset);
while(attr_map.x != id)
attr_map = kernel_tex_fetch(__attributes_map, ++attr_offset);
/* return result */
return (attr_map.y == ATTR_ELEMENT_NONE)? ATTR_STD_NOT_FOUND: attr_map.z;
}
__device float4 triangle_motion_vector(KernelGlobals *kg, ShaderData *sd)
{
float3 motion_pre = sd->P, motion_post = sd->P;
/* deformation motion */
int offset_pre = triangle_find_attribute(kg, sd, ATTR_STD_MOTION_PRE);
int offset_post = triangle_find_attribute(kg, sd, ATTR_STD_MOTION_POST);
if(offset_pre != ATTR_STD_NOT_FOUND)
motion_pre = triangle_attribute_float3(kg, sd, ATTR_ELEMENT_VERTEX, offset_pre, NULL, NULL);
if(offset_post != ATTR_STD_NOT_FOUND)
motion_post = triangle_attribute_float3(kg, sd, ATTR_ELEMENT_VERTEX, offset_post, NULL, NULL);
/* object motion. note that depending on the mesh having motion vectors, this
transformation was set match the world/object space of motion_pre/post */
Transform tfm;
tfm = object_fetch_transform(kg, sd->object, TIME_INVALID, OBJECT_TRANSFORM_MOTION_PRE);
motion_pre = transform_point(&tfm, motion_pre);
tfm = object_fetch_transform(kg, sd->object, TIME_INVALID, OBJECT_TRANSFORM_MOTION_POST);
motion_post = transform_point(&tfm, motion_post);
/* camera motion */
tfm = kernel_data.cam.worldtoraster;
float3 P = transform_perspective(&tfm, sd->P);
tfm = kernel_data.cam.motion.pre;
motion_pre = transform_perspective(&tfm, motion_pre) - P;
tfm = kernel_data.cam.motion.post;
motion_post = P - transform_perspective(&tfm, motion_post);
return make_float4(motion_pre.x, motion_pre.y, motion_post.x, motion_post.y);
}
__device float3 triangle_uv(KernelGlobals *kg, ShaderData *sd)
{
int offset_uv = triangle_find_attribute(kg, sd, ATTR_STD_UV);
if(offset_uv == ATTR_STD_NOT_FOUND)
return make_float3(0.0f, 0.0f, 0.0f);
float3 uv = triangle_attribute_float3(kg, sd, ATTR_ELEMENT_CORNER, offset_uv, NULL, NULL);
uv.z = 1.0f;
return uv;
}
CCL_NAMESPACE_END
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