forked from bartvdbraak/blender
1d8c798188
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.
206 lines
6.3 KiB
C
206 lines
6.3 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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/* Perspective Camera */
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__device float2 camera_sample_aperture(KernelGlobals *kg, float u, float v)
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{
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float blades = kernel_data.cam.blades;
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if(blades == 0.0f) {
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/* sample disk */
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return concentric_sample_disk(u, v);
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}
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else {
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/* sample polygon */
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float rotation = kernel_data.cam.bladesrotation;
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return regular_polygon_sample(blades, rotation, u, v);
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}
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}
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__device void camera_sample_perspective(KernelGlobals *kg, float raster_x, float raster_y, float lens_u, float lens_v, Ray *ray)
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{
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/* create ray form raster position */
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Transform rastertocamera = kernel_data.cam.rastertocamera;
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float3 Pcamera = transform_perspective(&rastertocamera, make_float3(raster_x, raster_y, 0.0f));
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ray->P = make_float3(0.0f, 0.0f, 0.0f);
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ray->D = Pcamera;
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/* modify ray for depth of field */
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float aperturesize = kernel_data.cam.aperturesize;
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if(aperturesize > 0.0f) {
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/* sample point on aperture */
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float2 lensuv = camera_sample_aperture(kg, lens_u, lens_v)*aperturesize;
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/* compute point on plane of focus */
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float ft = kernel_data.cam.focaldistance/ray->D.z;
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float3 Pfocus = ray->P + ray->D*ft;
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/* update ray for effect of lens */
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ray->P = make_float3(lensuv.x, lensuv.y, 0.0f);
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ray->D = normalize(Pfocus - ray->P);
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}
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/* transform ray from camera to world */
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Transform cameratoworld = kernel_data.cam.cameratoworld;
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#ifdef __MOTION__
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if(ray->time != TIME_INVALID)
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transform_motion_interpolate(&cameratoworld, &kernel_data.cam.motion, ray->time);
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#endif
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ray->P = transform_point(&cameratoworld, ray->P);
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ray->D = transform_direction(&cameratoworld, ray->D);
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ray->D = normalize(ray->D);
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#ifdef __RAY_DIFFERENTIALS__
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/* ray differential */
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float3 Ddiff = transform_direction(&cameratoworld, Pcamera);
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ray->dP.dx = make_float3(0.0f, 0.0f, 0.0f);
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ray->dP.dy = make_float3(0.0f, 0.0f, 0.0f);
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ray->dD.dx = normalize(Ddiff + float4_to_float3(kernel_data.cam.dx)) - normalize(Ddiff);
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ray->dD.dy = normalize(Ddiff + float4_to_float3(kernel_data.cam.dy)) - normalize(Ddiff);
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#endif
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#ifdef __CAMERA_CLIPPING__
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/* clipping */
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ray->P += kernel_data.cam.nearclip*ray->D;
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ray->t = kernel_data.cam.cliplength;
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#else
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ray->t = FLT_MAX;
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#endif
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}
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/* Orthographic Camera */
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__device void camera_sample_orthographic(KernelGlobals *kg, float raster_x, float raster_y, Ray *ray)
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{
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/* create ray form raster position */
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Transform rastertocamera = kernel_data.cam.rastertocamera;
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float3 Pcamera = transform_perspective(&rastertocamera, make_float3(raster_x, raster_y, 0.0f));
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ray->P = Pcamera;
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ray->D = make_float3(0.0f, 0.0f, 1.0f);
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/* transform ray from camera to world */
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Transform cameratoworld = kernel_data.cam.cameratoworld;
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#ifdef __MOTION__
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if(ray->time != TIME_INVALID)
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transform_motion_interpolate(&cameratoworld, &kernel_data.cam.motion, ray->time);
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#endif
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ray->P = transform_point(&cameratoworld, ray->P);
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ray->D = transform_direction(&cameratoworld, ray->D);
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ray->D = normalize(ray->D);
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#ifdef __RAY_DIFFERENTIALS__
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/* ray differential */
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ray->dP.dx = float4_to_float3(kernel_data.cam.dx);
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ray->dP.dy = float4_to_float3(kernel_data.cam.dy);
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ray->dD.dx = make_float3(0.0f, 0.0f, 0.0f);
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ray->dD.dy = make_float3(0.0f, 0.0f, 0.0f);
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#endif
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#ifdef __CAMERA_CLIPPING__
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/* clipping */
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ray->t = kernel_data.cam.cliplength;
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#else
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ray->t = FLT_MAX;
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#endif
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}
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/* Environment Camera */
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__device void camera_sample_environment(KernelGlobals *kg, float raster_x, float raster_y, Ray *ray)
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{
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Transform rastertocamera = kernel_data.cam.rastertocamera;
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float3 Pcamera = transform_perspective(&rastertocamera, make_float3(raster_x, raster_y, 0.0f));
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/* create ray form raster position */
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ray->P = make_float3(0.0f, 0.0f, 0.0f);
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ray->D = equirectangular_to_direction(Pcamera.x, Pcamera.y);
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/* transform ray from camera to world */
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Transform cameratoworld = kernel_data.cam.cameratoworld;
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#ifdef __MOTION__
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if(ray->time != TIME_INVALID)
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transform_motion_interpolate(&cameratoworld, &kernel_data.cam.motion, ray->time);
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#endif
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ray->P = transform_point(&cameratoworld, ray->P);
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ray->D = transform_direction(&cameratoworld, ray->D);
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ray->D = normalize(ray->D);
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#ifdef __RAY_DIFFERENTIALS__
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/* ray differential */
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ray->dP.dx = make_float3(0.0f, 0.0f, 0.0f);
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ray->dP.dy = make_float3(0.0f, 0.0f, 0.0f);
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Pcamera = transform_perspective(&rastertocamera, make_float3(raster_x + 1.0f, raster_y, 0.0f));
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ray->dD.dx = normalize(transform_direction(&cameratoworld, equirectangular_to_direction(Pcamera.x, Pcamera.y))) - ray->D;
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Pcamera = transform_perspective(&rastertocamera, make_float3(raster_x, raster_y + 1.0f, 0.0f));
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ray->dD.dy = normalize(transform_direction(&cameratoworld, equirectangular_to_direction(Pcamera.x, Pcamera.y))) - ray->D;
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#endif
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#ifdef __CAMERA_CLIPPING__
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/* clipping */
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ray->t = kernel_data.cam.cliplength;
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#else
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ray->t = FLT_MAX;
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#endif
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}
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/* Common */
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__device void camera_sample(KernelGlobals *kg, int x, int y, float filter_u, float filter_v,
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float lens_u, float lens_v, float time, Ray *ray)
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{
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/* pixel filter */
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float raster_x = x + kernel_tex_interp(__filter_table, filter_u, FILTER_TABLE_SIZE);
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float raster_y = y + kernel_tex_interp(__filter_table, filter_v, FILTER_TABLE_SIZE);
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#ifdef __MOTION__
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/* motion blur */
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if(kernel_data.cam.shuttertime == 0.0f)
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ray->time = TIME_INVALID;
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else
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ray->time = 0.5f + (time - 0.5f)*kernel_data.cam.shuttertime;
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#endif
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/* sample */
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if(kernel_data.cam.type == CAMERA_PERSPECTIVE)
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camera_sample_perspective(kg, raster_x, raster_y, lens_u, lens_v, ray);
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else if(kernel_data.cam.type == CAMERA_ORTHOGRAPHIC)
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camera_sample_orthographic(kg, raster_x, raster_y, ray);
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else
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camera_sample_environment(kg, raster_x, raster_y, ray);
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}
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CCL_NAMESPACE_END
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