Exact supported OpenGL texture sizes/Code Snippet (SoCoder)

Created 23 June 2011 | Last Edited 23 June 2011)

Exact supported OpenGL texture sizes by HoboBen | No Votes

To get an idea of the maximum size textures your graphics card supports, you can use "proxy textures" in OpenGL 1.1 and above.

This can depend on the specific implementation of your textures, which is why this can't always be known in advance.

Note that your graphics card may support larger textures, but there's no way (that I know of) to tell if it actually uses hardware acceleration at those levels.

But at least you know if can physically do it without crashing.

    /* Windows is an idiot */
#   ifndef GL_UNSIGNED_INT_8_8_8_8
#       define GL_UNSIGNED_INT_8_8_8_8 32821
#   endif
#   ifndef GL_COMBINE
#       define GL_COMBINE 34160
#   endif

#   define MY_OPENGL_TEXTURE2D_INTERNAL_FORMAT GL_RGBA8
#   define MY_OPENGL_TEXTURE2D_IMPLEMENTATION_FORMAT GL_RGBA
#   define MY_OPENGL_TEXTURE2D_IMPLEMENTATION_PACKING GL_UNSIGNED_INT_8_8_8_8

void GlTextureInfo(void)
{
    /* Use proxy textures to test sizes */

    int i, s;
    GLint width = 0;

    for (i = 0; i <= 16; i++)
    {
        s = (int) pow(2, i);
    
        glTexImage2D(GL_PROXY_TEXTURE_2D, 0,
                    MY_OPENGL_TEXTURE2D_INTERNAL_FORMAT,
                    s, s, 0,
                    MY_OPENGL_TEXTURE2D_IMPLEMENTATION_FORMAT,
                    MY_OPENGL_TEXTURE2D_IMPLEMENTATION_PACKING,
                    NULL);
                    
        glGetTexLevelParameteriv(GL_PROXY_TEXTURE_2D, 0,
                                 GL_TEXTURE_WIDTH, &width);
                    
        if (width == 0)
        {
            printf("DEBUG: OpenGl: Proxy Texture %dx%d (FAIL)\n", s, s);
        }
        else
        {
            printf("DEBUG: OpenGl: Proxy Texture %dx%d (PASS)\n", s, s);
        }
    }

}

-->

Example output for my four-year old laptop with Intel Graphics:

DEBUG: OpenGl: Proxy Texture 1x1 (PASS)
DEBUG: OpenGl: Proxy Texture 2x2 (PASS)
DEBUG: OpenGl: Proxy Texture 4x4 (PASS)
DEBUG: OpenGl: Proxy Texture 8x8 (PASS)
DEBUG: OpenGl: Proxy Texture 16x16 (PASS)
DEBUG: OpenGl: Proxy Texture 32x32 (PASS)
DEBUG: OpenGl: Proxy Texture 64x64 (PASS)
DEBUG: OpenGl: Proxy Texture 128x128 (PASS)
DEBUG: OpenGl: Proxy Texture 256x256 (PASS)
DEBUG: OpenGl: Proxy Texture 512x512 (PASS)
DEBUG: OpenGl: Proxy Texture 1024x1024 (PASS)
DEBUG: OpenGl: Proxy Texture 2048x2048 (PASS)
DEBUG: OpenGl: Proxy Texture 4096x4096 (FAIL)
DEBUG: OpenGl: Proxy Texture 8192x8192 (FAIL)
DEBUG: OpenGl: Proxy Texture 16384x16384 (FAIL)
DEBUG: OpenGl: Proxy Texture 32768x32768 (FAIL)
DEBUG: OpenGl: Proxy Texture 65536x65536 (FAIL)

-->

Example output on my four-year old PC with a nice shiny GTX 460:

DEBUG: OpenGl: Proxy Texture 1x1 (PASS)
DEBUG: OpenGl: Proxy Texture 2x2 (PASS)
DEBUG: OpenGl: Proxy Texture 4x4 (PASS)
DEBUG: OpenGl: Proxy Texture 8x8 (PASS)
DEBUG: OpenGl: Proxy Texture 16x16 (PASS)
DEBUG: OpenGl: Proxy Texture 32x32 (PASS)
DEBUG: OpenGl: Proxy Texture 64x64 (PASS)
DEBUG: OpenGl: Proxy Texture 128x128 (PASS)
DEBUG: OpenGl: Proxy Texture 256x256 (PASS)
DEBUG: OpenGl: Proxy Texture 512x512 (PASS)
DEBUG: OpenGl: Proxy Texture 1024x1024 (PASS)
DEBUG: OpenGl: Proxy Texture 2048x2048 (PASS)
DEBUG: OpenGl: Proxy Texture 4096x4096 (PASS)
DEBUG: OpenGl: Proxy Texture 8192x8192 (PASS)
DEBUG: OpenGl: Proxy Texture 16384x16384 (PASS)
DEBUG: OpenGl: Proxy Texture 32768x32768 (FAIL)
DEBUG: OpenGl: Proxy Texture 65536x65536 (FAIL)

-->

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