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

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
+