glamor: Store the actual EGL/GLX context pointer in lastGLContext
Fixes subtle breakage which could sometimes trigger after a server reset with multiple screens using glamor: Screen A enters glamor_close_screen last and calls various cleanup functions, which at some point call glamor_make_current to make sure screen A's GL context is current. This sets lastGLContext to screen A's &glamor_priv->ctx. Finally, glamor_close_screen calls glamor_release_screen_priv, which calls free(glamor_priv). Later, screen B enters glamor_init, which allocates a new glamor_priv. With bad luck, this can return the same pointer which was previously used for screen A's glamor_priv. So when screen B's glamor_init calls glamor_make_current, lastGLContext == &glamor_priv->ctx, so MakeCurrent isn't called for screen B's GL context, and the following OpenGL API calls triggered by glamor_init mess up screen A's GL context. The observed end result of this was a crash in glamor_get_vbo_space because glamor_priv->vbo didn't match the GL context, though there might be other possible outcomes. Assigning the actual GL context pointer to lastGLContext prevents this by preventing the false negative test in glamor_make_current. Reviewed-by: Keith Packard <keithp@keithp.com> Reviewed-by: Eric Anholt <eric@anholt.net>
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@ -723,8 +723,8 @@ glamor_is_large_pixmap(PixmapPtr pixmap)
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static inline void
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glamor_make_current(glamor_screen_private *glamor_priv)
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{
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if (lastGLContext != &glamor_priv->ctx) {
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lastGLContext = &glamor_priv->ctx;
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if (lastGLContext != glamor_priv->ctx.ctx) {
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lastGLContext = glamor_priv->ctx.ctx;
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glamor_priv->ctx.make_current(&glamor_priv->ctx);
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}
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}
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