2 // Copyright (C) 2006 Matthias Braun <matze@braunis.de>
4 // This program is free software: you can redistribute it and/or modify
5 // it under the terms of the GNU General Public License as published by
6 // the Free Software Foundation, either version 3 of the License, or
7 // (at your option) any later version.
9 // This program is distributed in the hope that it will be useful,
10 // but WITHOUT ANY WARRANTY; without even the implied warranty of
11 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 // GNU General Public License for more details.
14 // You should have received a copy of the GNU General Public License
15 // along with this program. If not, see <http://www.gnu.org/licenses/>.
17 #include "supertux/gameconfig.hpp"
18 #include "video/gl/gl_texture.hpp"
22 inline bool is_power_of_2(int v)
24 return (v & (v-1)) == 0;
27 inline int next_power_of_two(int val)
37 GLTexture::GLTexture(unsigned int width, unsigned int height)
39 assert(is_power_of_2(width));
40 assert(is_power_of_2(height));
41 texture_width = width;
42 texture_height = height;
44 image_height = height;
46 assert_gl("before creating texture");
47 glGenTextures(1, &handle);
50 glBindTexture(GL_TEXTURE_2D, handle);
52 glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, texture_width,
53 texture_height, 0, GL_RGBA, GL_UNSIGNED_BYTE, 0);
57 glDeleteTextures(1, &handle);
62 GLTexture::GLTexture(SDL_Surface* image)
64 texture_width = next_power_of_two(image->w);
65 texture_height = next_power_of_two(image->h);
66 image_width = image->w;
67 image_height = image->h;
69 #if SDL_BYTEORDER == SDL_BIG_ENDIAN
70 SDL_Surface* convert = SDL_CreateRGBSurface(SDL_SWSURFACE,
71 texture_width, texture_height, 32,
72 0xff000000, 0x00ff0000, 0x0000ff00, 0x000000ff);
74 SDL_Surface* convert = SDL_CreateRGBSurface(SDL_SWSURFACE,
75 texture_width, texture_height, 32,
76 0x000000ff, 0x0000ff00, 0x00ff0000, 0xff000000);
80 throw std::runtime_error("Couldn't create texture: out of memory");
83 SDL_SetAlpha(image, 0, 0);
84 SDL_BlitSurface(image, 0, convert, 0);
86 assert_gl("before creating texture");
87 glGenTextures(1, &handle);
91 if(convert->format->BytesPerPixel == 3)
93 else if(convert->format->BytesPerPixel == 4)
98 glBindTexture(GL_TEXTURE_2D, handle);
99 glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
100 #ifdef GL_UNPACK_ROW_LENGTH
101 glPixelStorei(GL_UNPACK_ROW_LENGTH, convert->pitch/convert->format->BytesPerPixel);
103 /* OpenGL ES doesn't support UNPACK_ROW_LENGTH, let's hope SDL didn't add
104 * padding bytes, otherwise we need some extra code here... */
105 assert(convert->pitch == texture_width * convert->format->BytesPerPixel);
108 if(SDL_MUSTLOCK(convert))
110 SDL_LockSurface(convert);
112 glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, texture_width,
113 texture_height, 0, sdl_format,
114 GL_UNSIGNED_BYTE, convert->pixels);
115 if(SDL_MUSTLOCK(convert))
117 SDL_UnlockSurface(convert);
120 assert_gl("creating texture");
122 set_texture_params();
124 glDeleteTextures(1, &handle);
125 SDL_FreeSurface(convert);
128 SDL_FreeSurface(convert);
131 GLTexture::~GLTexture()
133 glDeleteTextures(1, &handle);
137 GLTexture::set_texture_params()
139 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
140 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
142 /* OpenGL ES doesn't support it */
143 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP);
144 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP);
147 assert_gl("set texture params");