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
133 lines
3.9 KiB
C
133 lines
3.9 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 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(&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 lensradius = kernel_data.cam.lensradius;
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if(lensradius > 0.0f) {
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/* sample point on lens */
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float2 lensuv;
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lensuv = concentric_sample_disk(lens_u, lens_v);
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lensuv *= lensradius;
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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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ray->P = transform(&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 + kernel_data.cam.dx) - normalize(Ddiff);
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ray->dD.dy = normalize(Ddiff + 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(&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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ray->P = transform(&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 = kernel_data.cam.dx;
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ray->dP.dy = 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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/* Common */
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__device void camera_sample(KernelGlobals *kg, int x, int y, float filter_u, float filter_v, float lens_u, float lens_v, 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);
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float raster_y = y + kernel_tex_interp(__filter_table, filter_v);
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/* motion blur */
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//ray->time = lerp(time_t, kernel_data.cam.shutter_open, kernel_data.cam.shutter_close);
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/* sample */
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if(kernel_data.cam.ortho)
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camera_sample_orthographic(kg, raster_x, raster_y, ray);
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else
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camera_sample_perspective(kg, raster_x, raster_y, lens_u, lens_v, ray);
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}
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CCL_NAMESPACE_END
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