[SDL] SDL and OpenGL textures

[Scott Harper]

Just so you know, don't forget to to a "glEnable(GL_TEXTURE_2D);" before 
you actually RENDER the object you're texturing...  I uh...  Just forgot 
to do that, and spent about an HOUR looking for the reason it wasn't 
working right...  -.-;;;

--Scott


Samuel wrote:

>go to nehe.gamedev.net and try the tutorials. there are SDL/Linux ports at the 
>bottom of the tutorial.
>
>also when doing textures in GL you must make sure that the texture is a factor 
>of 2
>
>512x512, 256x256, 64x64, ... 
>
>here check out this snipit
>
><code>
>
>int LoadTextures ()
>{
>  int status = FALSE;
>
>  SDL_Surface *textureImage;
>
>  /* load the bitmap, check for errors, 
>   * quit if bmp not found */
>  if ((textureImage = SDL_LoadBMP ("texture.bmp")))
>    {
>      status = TRUE;
>
>      /* setup the texture image */
>      glGenTextures (1, &texture);
>      glBindTexture (GL_TEXTURE_2D, texture);
>
>      /* map out the texture image */
>      glTexImage2D (GL_TEXTURE_2D,
>                    0,
>                    3,
>                    textureImage->w,
>                    textureImage->h,
>                    0, GL_BGR, GL_UNSIGNED_BYTE, textureImage->pixels);
>
>      /* filter the texture image with linear filtering */
>      glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
>      glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
>
>      /* free texture memory */
>      SDL_FreeSurface (textureImage);
>    }
>  return status;
>}
>
></code>
>
>On Tuesday 20 April 2004 08:37 am, Ralf Berger wrote:
>  
>
>>Hello,
>>
>>is somebody able to give me a pointer to a code-sniplet where a texture is
>>mapped to an OpenGL 3D surface (GL_QUADS)? The texture should be an
>>SDL_Surface.
>>
>>I've already messed around with the examples from the testgl.c file and the
>>NeHe-Tutorial (lesson 6) with no success. With the testgl.c code I'm able
>>to load arbitrary images and use the SDL_Surface texture in the 2D-mode
>>only, but was not able to map the same texture to on of the cube surfaces.
>>
>>Since no OpenGL and no SDL error is reported, I'm a little bit lost in
>>confusion! Any help will be appreciated.
>>
>>Regards
>>Ralf
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>>
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>>    
>>
>
>  
>