diff options
author | Ton Roosendaal <ton@blender.org> | 2011-04-27 15:58:34 +0400 |
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committer | Ton Roosendaal <ton@blender.org> | 2011-04-27 15:58:34 +0400 |
commit | da376e0237517543aa21740ee2363234ee1c20ae (patch) | |
tree | 014a513ed8d0eccc5e54fef42347781e85bae56a /intern/cycles/kernel/kernel_film.h | |
parent | 693780074388111e7b9ef1c3825e462f398dc6c4 (diff) |
Cycles render engine, initial commit. This is the engine itself, blender modifications and build instructions will follow later.
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
Diffstat (limited to 'intern/cycles/kernel/kernel_film.h')
-rw-r--r-- | intern/cycles/kernel/kernel_film.h | 68 |
1 files changed, 68 insertions, 0 deletions
diff --git a/intern/cycles/kernel/kernel_film.h b/intern/cycles/kernel/kernel_film.h new file mode 100644 index 00000000000..04ea889f4c0 --- /dev/null +++ b/intern/cycles/kernel/kernel_film.h @@ -0,0 +1,68 @@ +/* + * 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 + |