#pragma section-numbers off
#pragma disable-camelcase

= SDL_GL_SetAttribute =
Use this function to set an OpenGL window attribute before window creation.

<<TableOfContents()>>

== Syntax ==
{{{#!highlight cpp
int SDL_GL_SetAttribute(SDL_GLattr attr,
                        int        value)
}}}

== Function Parameters ==
||'''attr'''||the OpenGL attribute to set; see [[#Remarks|Remarks]] for details||
||'''value'''||the desired value for the attribute||

== Return Value ==
Returns 0 on success or a negative error code on failure; call [[SDL_GetError]]() for more information.

== Code Examples ==
{{{#!highlight cpp
SDL_Window *window;
SDL_GLContext context;

SDL_GL_SetAttribute(SDL_GL_RED_SIZE, 5);
SDL_GL_SetAttribute(SDL_GL_GREEN_SIZE, 5);
SDL_GL_SetAttribute(SDL_GL_BLUE_SIZE, 5);
SDL_GL_SetAttribute(SDL_GL_DEPTH_SIZE, 16);
SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, 1);

window = SDL_CreateWindow("OpenGL Window", SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, 640, 480, SDL_WINDOW_OPENGL);
if (!window) {
    fprintf(stderr, "Couldn't create window: %s\n", SDL_GetError());
    return;
}

context = SDL_GL_CreateContext(window);
if (!context) {
    fprintf(stderr, "Couldn't create context: %s\n", SDL_GetError());
    return;
}

int r, g, b;
SDL_GL_GetAttribute(SDL_GL_RED_SIZE, &r);
SDL_GL_GetAttribute(SDL_GL_GREEN_SIZE, &g);
SDL_GL_GetAttribute(SDL_GL_BLUE_SIZE, &b);

printf("Red size: %d, Green size: %d, Blue size: %d\n", r, g, b);
}}}

== Remarks ==
This function sets the OpenGL attribute '''attr''' to '''value'''. The requested attributes should be set before creating an OpenGL window. You should use [[SDL_GL_GetAttribute]]() to check the values after creating the OpenGL context, since the values obtained can differ from the requested ones.

'''attr''' may be one of the following [[SDL_GLattr]] values:
<<Include(SDL_GLattr, , , from="== Values ==", to="== Code Examples ==")>>

== Related Functions ==
 .[[SDL_GL_GetAttribute]]
 .[[SDL_GL_ResetAttributes]]

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[[CategoryAPI]], [[CategoryVideo]]