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