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sdl2: Fix GL3 context creation

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The check to verify whether we've got the right GL context was
checking that the GL version was less than 3 whenever the non-GL3
driver is used. However it looks like the driver is free to return a
GL3 context that is compatible with GL2 if GL2 is requested so this
was breaking the GL2 driver.

This also adds the necessary SDL attributes to request a forward
compatible core context like the GLX and EGL winsys's do. I haven't
actually tested this because it looks like SDL will only create a GL
context with GLX and I haven't got a recent enough X server to handle
the glXCreateContextAttribs request.

Reviewed-by: Robert Bragg <robert@linux.intel.com>

(cherry picked from commit d46acafa3ea7ba2e6c4ac7a45f00a132df1b2872)
This commit is contained in:
Neil Roberts 2012-10-03 12:06:02 +01:00 committed by Robert Bragg
parent 8039c2c779
commit 76843fc529
1 changed files with 14 additions and 21 deletions
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35
cogl/winsys/cogl-winsys-sdl2.c
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@ -159,7 +159,13 @@ _cogl_winsys_display_setup (CoglDisplay *display,
else if (display->renderer->driver == COGL_DRIVER_GLES2)
SDL_GL_SetAttribute (SDL_GL_CONTEXT_MAJOR_VERSION, 2);
else if (display->renderer->driver == COGL_DRIVER_GL3)
SDL_GL_SetAttribute (SDL_GL_CONTEXT_MAJOR_VERSION, 3);
{
SDL_GL_SetAttribute (SDL_GL_CONTEXT_MAJOR_VERSION, 3);
SDL_GL_SetAttribute (SDL_GL_CONTEXT_PROFILE_MASK,
SDL_GL_CONTEXT_PROFILE_CORE);
SDL_GL_SetAttribute (SDL_GL_CONTEXT_FLAGS,
SDL_GL_CONTEXT_FORWARD_COMPATIBLE_FLAG);
}
/* Create a dummy 1x1 window that never gets display so that we can
* create a GL context */
@ -209,27 +215,14 @@ _cogl_winsys_display_setup (CoglDisplay *display,
goto error;
}
if (gl_version[0] >= '3')
if (display->renderer->driver == COGL_DRIVER_GL3 &&
gl_version[0] < '3')
{
if (display->renderer->driver == COGL_DRIVER_GL)
{
_cogl_set_error (error, COGL_WINSYS_ERROR,
COGL_WINSYS_ERROR_INIT,
"The GL driver was requested but SDL is using "
"GL %c", gl_version[0]);
goto error;
}
}
else
{
if (display->renderer->driver == COGL_DRIVER_GL3)
{
_cogl_set_error (error, COGL_WINSYS_ERROR,
COGL_WINSYS_ERROR_INIT,
"The GL3 driver was requested but SDL is using "
"GL %c", gl_version[0]);
goto error;
}
_cogl_set_error (error, COGL_WINSYS_ERROR,
COGL_WINSYS_ERROR_INIT,
"The GL3 driver was requested but SDL is using "
"GL %c", gl_version[0]);
goto error;
}
break;