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Texture from SDL_image

Started by Jonan Jul 3, 2006 at 1:40 PM 5 replies 1.1k views

Original Post

Jul 3, 2006 at 1:40 PM

Hello, I have a problem using OpenGl. The thing is that I want to create a texture from a SDL_Surface, I explain, I load an image with SDL_image into a SDL_Surface, and I need to create a texture for OpenGL from this SDL_Surface. The function I use to load the image is IMG_Load(). Can someone help me? Thanks

JohnnyCasil

Jul 3, 2006 at 1:47 PM

Just pass the info needed from the SDL_Surface* structure to glTexImage2D.

nullsquared

127

nullsquared

Jul 3, 2006 at 1:49 PM

This will be useful:

SDL_Surface::pixelsSDL_Surface::wSDL_Surrace::h

Taymo

Jul 3, 2006 at 2:45 PM

Loading a OpenGL texture with SDL_Surface data:

http://www.libsdl.org/cgi/docwiki.cgi/OpenGL_20Texture_20Example

cignox1

223

cignox1

Jul 4, 2006 at 1:41 AM

just some code if you find it useful:

                SDL_Surface* mm = IMG_Load("texture.tga");                if(!mm) exit(0);                SDL_Surface* m = FlipSurfaceV(mm); //Reverse the pixels because using tga                unsigned int t;                glGenTextures(1, &t);                glBindTexture(GL_TEXTURE_2D, t);                glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, m->w, m->h, 0, GL_BGRA, GL_UNSIGNED_BYTE, m->pixels);                glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_LINEAR);	// Linear Filtering                glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_LINEAR);	// Linear Filtering

Should be everything clear. If you wonder what FlipSurfaceV() is, it's only a function I wrote to reorder the pixels in a tga image. If you use other formats, don't care about that. If you need it, just ask ;-)

Jonan

Author

Jonan

Jul 4, 2006 at 10:04 AM

Thanks to everyone, I've been able to do it now. I don't use .tga, I only use .jpg, .png and .gif, so I have no problem.

Thanks again

cignox1

223

cignox1

Jul 4, 2006 at 12:50 PM

Good to hear that you solved your problem. Just remember that gif only stores up to 256 indexed colors and that jpg doesn't provide alpha channel...

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