forked from bartvdbraak/blender
86 lines
2.3 KiB
Plaintext
86 lines
2.3 KiB
Plaintext
/*
|
|
* 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);
|
|
}
|