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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
__device float4 film_map(KernelGlobals *kg, float4 irradiance, int sample)
{
float scale = 1.0f/(float)(sample+1);
float exposure = kernel_data.film.exposure;
float4 result = irradiance*scale;
/* conversion to srgb */
result.x = color_scene_linear_to_srgb(result.x*exposure);
result.y = color_scene_linear_to_srgb(result.y*exposure);
result.z = color_scene_linear_to_srgb(result.z*exposure);
/* clamp since alpha might be > 1.0 due to russian roulette */
result.w = clamp(result.w, 0.0f, 1.0f);
return result;
}
__device uchar4 film_float_to_byte(float4 color)
{
uchar4 result;
/* simple float to byte conversion */
result.x = (uchar)clamp(color.x*255.0f, 0.0f, 255.0f);
result.y = (uchar)clamp(color.y*255.0f, 0.0f, 255.0f);
result.z = (uchar)clamp(color.z*255.0f, 0.0f, 255.0f);
result.w = (uchar)clamp(color.w*255.0f, 0.0f, 255.0f);
return result;
}
__device void kernel_film_tonemap(KernelGlobals *kg,
__global uchar4 *rgba, __global float *buffer,
int sample, int x, int y, int offset, int stride)
{
/* buffer offset */
int index = offset + x + y*stride;
rgba += index;
buffer += index*kernel_data.film.pass_stride;
/* map colors */
float4 irradiance = *((__global float4*)buffer);
float4 float_result = film_map(kg, irradiance, sample);
uchar4 byte_result = film_float_to_byte(float_result);
*rgba = byte_result;
}
CCL_NAMESPACE_END
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