forked from bartvdbraak/blender
f2c54df625
Currently only two mappings are supported by API, which is Repeat (old behavior) and new Clip behavior. Internally this extension is being converted to periodic flag which was already supported but wasn't exposed. There's no support for OpenCL yet because of the way how we pack images into a single texture. Those settings are not exposed to UI or anywhere else and there should be no functional changes so far.
236 lines
7.7 KiB
Plaintext
236 lines
7.7 KiB
Plaintext
/*
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* Copyright 2011-2013 Blender Foundation
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "stdosl.h"
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#include "node_color.h"
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point texco_remap_square(point co)
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{
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return (co - point(0.5, 0.5, 0.5)) * 2.0;
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}
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point map_to_tube(vector dir)
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{
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float u, v;
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v = (dir[2] + 1.0) * 0.5;
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float len = sqrt(dir[0] * dir[0] + dir[1] * dir[1]);
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if (len > 0.0) {
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u = (1.0 - (atan2(dir[0] / len, dir[1] / len) / M_PI)) * 0.5;
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}
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else {
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v = u = 0.0; /* To avoid un-initialized variables. */
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}
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return point(u, v, 0.0);
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}
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point map_to_sphere(vector dir)
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{
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float len = length(dir);
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float v, u;
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if (len > 0.0) {
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if (dir[0] == 0.0 && dir[1] == 0.0) {
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u = 0.0; /* Othwise domain error. */
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}
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else {
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u = (1.0 - atan2(dir[0], dir[1]) / M_PI) / 2.0;
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}
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v = 1.0 - acos(dir[2] / len) / M_PI;
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}
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else {
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v = u = 0.0; /* To avoid un-initialized variables. */
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}
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return point(u, v, 0.0);
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}
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color image_texture_lookup(string filename,
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string color_space,
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float u, float v,
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output float Alpha,
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int use_alpha,
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int is_float,
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string interpolation,
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string wrap)
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{
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color rgb = (color)texture(filename, u, 1.0 - v, "wrap", wrap, "interp", interpolation, "alpha", Alpha);
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if (use_alpha) {
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rgb = color_unpremultiply(rgb, Alpha);
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if (!is_float)
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rgb = min(rgb, 1.0);
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}
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if (color_space == "sRGB") {
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rgb = color_srgb_to_scene_linear(rgb);
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}
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return rgb;
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}
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shader node_image_texture(
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int use_mapping = 0,
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matrix mapping = matrix(0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0),
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point Vector = P,
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string filename = "",
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string color_space = "sRGB",
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string projection = "Flat",
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string interpolation = "smartcubic",
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string wrap = "periodic",
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float projection_blend = 0.0,
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int is_float = 1,
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int use_alpha = 1,
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output color Color = 0.0,
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output float Alpha = 1.0)
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{
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point p = Vector;
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if (use_mapping)
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p = transform(mapping, p);
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if (projection == "Flat") {
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Color = image_texture_lookup(filename,
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color_space,
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p[0], p[1],
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Alpha,
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use_alpha,
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is_float,
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interpolation,
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wrap);
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}
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else if (projection == "Box") {
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/* object space normal */
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vector Nob = transform("world", "object", N);
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/* project from direction vector to barycentric coordinates in triangles */
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Nob = vector(fabs(Nob[0]), fabs(Nob[1]), fabs(Nob[2]));
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Nob /= (Nob[0] + Nob[1] + Nob[2]);
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/* basic idea is to think of this as a triangle, each corner representing
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* one of the 3 faces of the cube. in the corners we have single textures,
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* in between we blend between two textures, and in the middle we a blend
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* between three textures.
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*
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* the Nxyz values are the barycentric coordinates in an equilateral
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* triangle, which in case of blending, in the middle has a smaller
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* equilateral triangle where 3 textures blend. this divides things into
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* 7 zones, with an if () test for each zone */
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vector weight = vector(0.0, 0.0, 0.0);
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float blend = projection_blend;
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float limit = 0.5 * (1.0 + blend);
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/* first test for corners with single texture */
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if (Nob[0] > limit * (Nob[0] + Nob[1]) && Nob[0] > limit * (Nob[0] + Nob[2])) {
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weight[0] = 1.0;
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}
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else if (Nob[1] > limit * (Nob[0] + Nob[1]) && Nob[1] > limit * (Nob[1] + Nob[2])) {
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weight[1] = 1.0;
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}
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else if (Nob[2] > limit * (Nob[0] + Nob[2]) && Nob[2] > limit * (Nob[1] + Nob[2])) {
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weight[2] = 1.0;
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}
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else if (blend > 0.0) {
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/* in case of blending, test for mixes between two textures */
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if (Nob[2] < (1.0 - limit) * (Nob[1] + Nob[0])) {
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weight[0] = Nob[0] / (Nob[0] + Nob[1]);
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weight[0] = clamp((weight[0] - 0.5 * (1.0 - blend)) / blend, 0.0, 1.0);
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weight[1] = 1.0 - weight[0];
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}
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else if (Nob[0] < (1.0 - limit) * (Nob[1] + Nob[2])) {
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weight[1] = Nob[1] / (Nob[1] + Nob[2]);
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weight[1] = clamp((weight[1] - 0.5 * (1.0 - blend)) / blend, 0.0, 1.0);
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weight[2] = 1.0 - weight[1];
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}
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else if (Nob[1] < (1.0 - limit) * (Nob[0] + Nob[2])) {
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weight[0] = Nob[0] / (Nob[0] + Nob[2]);
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weight[0] = clamp((weight[0] - 0.5 * (1.0 - blend)) / blend, 0.0, 1.0);
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weight[2] = 1.0 - weight[0];
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}
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else {
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/* last case, we have a mix between three */
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weight[0] = ((2.0 - limit) * Nob[0] + (limit - 1.0)) / (2.0 * limit - 1.0);
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weight[1] = ((2.0 - limit) * Nob[1] + (limit - 1.0)) / (2.0 * limit - 1.0);
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weight[2] = ((2.0 - limit) * Nob[2] + (limit - 1.0)) / (2.0 * limit - 1.0);
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}
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}
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else {
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/* Desperate mode, no valid choice anyway, fallback to one side.*/
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weight[0] = 1.0;
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}
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Color = color(0.0, 0.0, 0.0);
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Alpha = 0.0;
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float tmp_alpha;
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if (weight[0] > 0.0) {
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Color += weight[0] * image_texture_lookup(filename,
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color_space,
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p[1], p[2],
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tmp_alpha,
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use_alpha,
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is_float,
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interpolation,
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wrap);
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Alpha += weight[0] * tmp_alpha;
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}
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if (weight[1] > 0.0) {
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Color += weight[1] * image_texture_lookup(filename,
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color_space,
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p[0], p[2],
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tmp_alpha,
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use_alpha,
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is_float,
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interpolation,
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wrap);
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Alpha += weight[1] * tmp_alpha;
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}
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if (weight[2] > 0.0) {
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Color += weight[2] * image_texture_lookup(filename,
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color_space,
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p[1], p[0],
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tmp_alpha,
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use_alpha,
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is_float,
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interpolation,
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wrap);
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Alpha += weight[2] * tmp_alpha;
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}
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}
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else if (projection == "Sphere") {
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point projected = map_to_sphere(texco_remap_square(p));
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Color = image_texture_lookup(filename,
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color_space,
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projected[0], projected[1],
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Alpha,
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use_alpha,
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is_float,
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interpolation,
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wrap);
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}
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else if (projection == "Tube") {
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point projected = map_to_tube(texco_remap_square(p));
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Color = image_texture_lookup(filename,
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color_space,
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projected[0], projected[1],
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Alpha,
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use_alpha,
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is_float,
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interpolation,
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wrap);
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}
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}
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