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) :
44 assert(is_power_of_2(width));
45 assert(is_power_of_2(height));
46 texture_width = width;
47 texture_height = height;
49 image_height = height;
51 assert_gl("before creating texture");
52 glGenTextures(1, &handle);
55 glBindTexture(GL_TEXTURE_2D, handle);
57 glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, texture_width,
58 texture_height, 0, GL_RGBA, GL_UNSIGNED_BYTE, 0);
62 glDeleteTextures(1, &handle);
67 GLTexture::GLTexture(SDL_Surface* image) :
74 texture_width = next_power_of_two(image->w);
75 texture_height = next_power_of_two(image->h);
76 image_width = image->w;
77 image_height = image->h;
79 #if SDL_BYTEORDER == SDL_BIG_ENDIAN
80 SDL_Surface* convert = SDL_CreateRGBSurface(SDL_SWSURFACE,
81 texture_width, texture_height, 32,
82 0xff000000, 0x00ff0000, 0x0000ff00, 0x000000ff);
84 SDL_Surface* convert = SDL_CreateRGBSurface(SDL_SWSURFACE,
85 texture_width, texture_height, 32,
86 0x000000ff, 0x0000ff00, 0x00ff0000, 0xff000000);
90 throw std::runtime_error("Couldn't create texture: out of memory");
93 SDL_SetAlpha(image, 0, 0);
94 SDL_BlitSurface(image, 0, convert, 0);
96 assert_gl("before creating texture");
97 glGenTextures(1, &handle);
101 if(convert->format->BytesPerPixel == 3)
103 else if(convert->format->BytesPerPixel == 4)
104 sdl_format = GL_RGBA;
108 glBindTexture(GL_TEXTURE_2D, handle);
109 glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
110 #ifdef GL_UNPACK_ROW_LENGTH
111 glPixelStorei(GL_UNPACK_ROW_LENGTH, convert->pitch/convert->format->BytesPerPixel);
113 /* OpenGL ES doesn't support UNPACK_ROW_LENGTH, let's hope SDL didn't add
114 * padding bytes, otherwise we need some extra code here... */
115 assert(convert->pitch == texture_width * convert->format->BytesPerPixel);
118 if(SDL_MUSTLOCK(convert))
120 SDL_LockSurface(convert);
122 glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, texture_width,
123 texture_height, 0, sdl_format,
124 GL_UNSIGNED_BYTE, convert->pixels);
125 if(SDL_MUSTLOCK(convert))
127 SDL_UnlockSurface(convert);
130 assert_gl("creating texture");
132 set_texture_params();
134 glDeleteTextures(1, &handle);
135 SDL_FreeSurface(convert);
138 SDL_FreeSurface(convert);
141 GLTexture::~GLTexture()
143 glDeleteTextures(1, &handle);
147 GLTexture::set_texture_params()
149 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
150 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
152 /* OpenGL ES doesn't support it */
153 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP);
154 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP);
157 assert_gl("set texture params");