1 files changed, 64 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..4373701452e
--- /dev/null
+++ b/intern/cycles/kernel/kernel_film.h
@@ -0,0 +1,64 @@
+/*
+ * 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 float4 *buffer, int sample, 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, sample);
+	uchar4 byte_result = film_float_to_byte(float_result);
+
+	rgba[index] = byte_result;
+}
+
+CCL_NAMESPACE_END
+