(This is the legacy documentation for SDL2, the previous stable version; SDL3 is the current stable version.)

SDL_GL_BindTexture

Bind an OpenGL/ES/ES2 texture to the current context.

Header File

Syntax

int SDL_GL_BindTexture(SDL_Texture *texture, float *texw, float *texh);

Function Parameters

SDL_Texture *	texture	the texture to bind to the current OpenGL/ES/ES2 context.
float *	texw	a pointer to a float value which will be filled with the texture width or NULL if you don't need that value.
float *	texh	a pointer to a float value which will be filled with the texture height or NULL if you don't need that value.

Return Value

(int) Returns 0 on success, or -1 if the operation is not supported; call SDL_GetError() for more information.

Remarks

This is for use with OpenGL instructions when rendering OpenGL primitives directly.

If not NULL, texw and texh will be filled with the width and height values suitable for the provided texture. In most cases, both will be 1.0, however, on systems that support the GL_ARB_texture_rectangle extension, these values will actually be the pixel width and height used to create the texture, so this factor needs to be taken into account when providing texture coordinates to OpenGL.

You need a renderer to create an SDL_Texture, therefore you can only use this function with an implicit OpenGL context from SDL_CreateRenderer(), not with your own OpenGL context. If you need control over your OpenGL context, you need to write your own texture-loading methods.

Also note that SDL may upload RGB textures as BGR (or vice-versa), and re-order the color channels in the shaders phase, so the uploaded texture may have swapped color channels.

Version

This function is available since SDL 2.0.0.