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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 pass)
{
float scale = kernel_data.film.exposure*(1.0f/(pass+1));
float4 result = irradiance*scale;
if(kernel_data.film.use_response_curve) {
/* camera response curve */
result.x = kernel_tex_interp(__response_curve_R, result.x);
result.y = kernel_tex_interp(__response_curve_G, result.y);
result.z = kernel_tex_interp(__response_curve_B, result.z);
}
else {
/* conversion to srgb */
result.x = color_scene_linear_to_srgb(result.x);
result.y = color_scene_linear_to_srgb(result.y);
result.z = color_scene_linear_to_srgb(result.z);
}
return result;
}
__device uchar4 film_float_to_byte(float4 color)
{
uchar4 result;
/* simple float to byte conversion */
result.x = clamp(color.x*255.0f, 0.0f, 255.0f);
result.y = clamp(color.y*255.0f, 0.0f, 255.0f);
result.z = clamp(color.z*255.0f, 0.0f, 255.0f);
result.w = 255;
return result;
}
__device void kernel_film_tonemap(KernelGlobals *kg, __global uchar4 *rgba, __global float4 *buffer, int pass, int resolution, int x, int y)
{
int w = kernel_data.cam.width;
int index = x + y*w;
float4 irradiance = buffer[index];
float4 float_result = film_map(kg, irradiance, pass);
uchar4 byte_result = film_float_to_byte(float_result);
rgba[index] = byte_result;
}
CCL_NAMESPACE_END
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