diff options
Diffstat (limited to 'intern/cycles/kernel/osl/shaders/node_environment_texture.osl')
-rw-r--r-- | intern/cycles/kernel/osl/shaders/node_environment_texture.osl | 85 |
1 files changed, 85 insertions, 0 deletions
diff --git a/intern/cycles/kernel/osl/shaders/node_environment_texture.osl b/intern/cycles/kernel/osl/shaders/node_environment_texture.osl new file mode 100644 index 00000000000..d04743eb368 --- /dev/null +++ b/intern/cycles/kernel/osl/shaders/node_environment_texture.osl @@ -0,0 +1,85 @@ +/* + * Copyright 2011-2013 Blender Foundation + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +#include "node_color.h" +#include "stdcycles.h" + +vector environment_texture_direction_to_equirectangular(vector dir) +{ + float u = -atan2(dir[1], dir[0]) / (M_2PI) + 0.5; + float v = atan2(dir[2], hypot(dir[0], dir[1])) / M_PI + 0.5; + + return vector(u, v, 0.0); +} + +vector environment_texture_direction_to_mirrorball(vector idir) +{ + vector dir = idir; + dir[1] -= 1.0; + + float div = 2.0 * sqrt(max(-0.5 * dir[1], 0.0)); + if (div > 0.0) + dir /= div; + + float u = 0.5 * (dir[0] + 1.0); + float v = 0.5 * (dir[2] + 1.0); + + return vector(u, v, 0.0); +} + +shader node_environment_texture( + int use_mapping = 0, + matrix mapping = matrix(0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0), + vector Vector = P, + string filename = "", + string projection = "equirectangular", + string interpolation = "linear", + int compress_as_srgb = 0, + int ignore_alpha = 0, + int unassociate_alpha = 0, + int is_float = 1, + output color Color = 0.0, + output float Alpha = 1.0) +{ + vector p = Vector; + + if (use_mapping) + p = transform(mapping, p); + + p = normalize(p); + + if (projection == "equirectangular") + p = environment_texture_direction_to_equirectangular(p); + else + p = environment_texture_direction_to_mirrorball(p); + + /* todo: use environment for better texture filtering of equirectangular */ + Color = (color)texture( + filename, p[0], 1.0 - p[1], "wrap", "periodic", "interp", interpolation, "alpha", Alpha); + + if (ignore_alpha) { + Alpha = 1.0; + } + else if (unassociate_alpha) { + Color = color_unpremultiply(Color, Alpha); + + if (!is_float) + Color = min(Color, 1.0); + } + + if (compress_as_srgb) + Color = color_srgb_to_scene_linear(Color); +} |