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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
/* Perspective Camera */
__device float2 camera_sample_aperture(KernelGlobals *kg, float u, float v)
{
float blades = kernel_data.cam.blades;
if(blades == 0.0f) {
/* sample disk */
return concentric_sample_disk(u, v);
}
else {
/* sample polygon */
float rotation = kernel_data.cam.bladesrotation;
return regular_polygon_sample(blades, rotation, u, v);
}
}
__device void camera_sample_perspective(KernelGlobals *kg, float raster_x, float raster_y, float lens_u, float lens_v, Ray *ray)
{
/* create ray form raster position */
Transform rastertocamera = kernel_data.cam.rastertocamera;
float3 Pcamera = transform(&rastertocamera, make_float3(raster_x, raster_y, 0.0f));
ray->P = make_float3(0.0f, 0.0f, 0.0f);
ray->D = Pcamera;
/* modify ray for depth of field */
float aperturesize = kernel_data.cam.aperturesize;
if(aperturesize > 0.0f) {
/* sample point on aperture */
float2 lensuv = camera_sample_aperture(kg, lens_u, lens_v)*aperturesize;
/* compute point on plane of focus */
float ft = kernel_data.cam.focaldistance/ray->D.z;
float3 Pfocus = ray->P + ray->D*ft;
/* update ray for effect of lens */
ray->P = make_float3(lensuv.x, lensuv.y, 0.0f);
ray->D = normalize(Pfocus - ray->P);
}
/* transform ray from camera to world */
Transform cameratoworld = kernel_data.cam.cameratoworld;
ray->P = transform(&cameratoworld, ray->P);
ray->D = transform_direction(&cameratoworld, ray->D);
ray->D = normalize(ray->D);
#ifdef __RAY_DIFFERENTIALS__
/* ray differential */
float3 Ddiff = transform_direction(&cameratoworld, Pcamera);
ray->dP.dx = make_float3(0.0f, 0.0f, 0.0f);
ray->dP.dy = make_float3(0.0f, 0.0f, 0.0f);
ray->dD.dx = normalize(Ddiff + kernel_data.cam.dx) - normalize(Ddiff);
ray->dD.dy = normalize(Ddiff + kernel_data.cam.dy) - normalize(Ddiff);
#endif
#ifdef __CAMERA_CLIPPING__
/* clipping */
ray->P += kernel_data.cam.nearclip*ray->D;
ray->t = kernel_data.cam.cliplength;
#else
ray->t = FLT_MAX;
#endif
}
/* Orthographic Camera */
__device void camera_sample_orthographic(KernelGlobals *kg, float raster_x, float raster_y, Ray *ray)
{
/* create ray form raster position */
Transform rastertocamera = kernel_data.cam.rastertocamera;
float3 Pcamera = transform(&rastertocamera, make_float3(raster_x, raster_y, 0.0f));
ray->P = Pcamera;
ray->D = make_float3(0.0f, 0.0f, 1.0f);
/* transform ray from camera to world */
Transform cameratoworld = kernel_data.cam.cameratoworld;
ray->P = transform(&cameratoworld, ray->P);
ray->D = transform_direction(&cameratoworld, ray->D);
ray->D = normalize(ray->D);
#ifdef __RAY_DIFFERENTIALS__
/* ray differential */
ray->dP.dx = kernel_data.cam.dx;
ray->dP.dy = kernel_data.cam.dy;
ray->dD.dx = make_float3(0.0f, 0.0f, 0.0f);
ray->dD.dy = make_float3(0.0f, 0.0f, 0.0f);
#endif
#ifdef __CAMERA_CLIPPING__
/* clipping */
ray->t = kernel_data.cam.cliplength;
#else
ray->t = FLT_MAX;
#endif
}
/* Common */
__device void camera_sample(KernelGlobals *kg, int x, int y, float filter_u, float filter_v, float lens_u, float lens_v, Ray *ray)
{
/* pixel filter */
float raster_x = x + kernel_tex_interp(__filter_table, filter_u);
float raster_y = y + kernel_tex_interp(__filter_table, filter_v);
/* motion blur */
//ray->time = lerp(time_t, kernel_data.cam.shutter_open, kernel_data.cam.shutter_close);
/* sample */
if(kernel_data.cam.ortho)
camera_sample_orthographic(kg, raster_x, raster_y, ray);
else
camera_sample_perspective(kg, raster_x, raster_y, lens_u, lens_v, ray);
}
CCL_NAMESPACE_END
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