glx: add a glx_screen member to indicate GLX_EXT_texture_from_pixmap

Reviewed-by: Marek Olšák <marek.olsak@amd.com>
Reviewed-by: Adam Jackson <ajax@redhat.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/30524>

src/glx/dri2_glx.c

@@ -1001,6 +1001,8 @@ dri2CreateScreen(int screen, struct glx_display * priv, bool driver_name_is_infe
    psp->getSwapInterval = dri2GetSwapInterval;
    psp->maxSwapInterval = INT_MAX;
 
+   psc->base.can_EXT_texture_from_pixmap = true;
+
    __glXEnableDirectExtension(&psc->base, "GLX_OML_sync_control");
    __glXEnableDirectExtension(&psc->base, "GLX_SGI_video_sync");
 

src/glx/dri3_glx.c

@@ -857,6 +857,12 @@ dri3_create_screen(int screen, struct glx_display * priv, bool driver_name_is_in
    psp->bindTexImage = dri3_bind_tex_image;
    psp->maxSwapInterval = INT_MAX;
 
+   /* when on a different gpu than the server, the server pixmaps
+    * can have a tiling mode we can't read. Thus we can't create
+    * a texture from them.
+    */
+   psc->base.can_EXT_texture_from_pixmap = psc->fd_render_gpu == psc->fd_display_gpu;
+
    __glXEnableDirectExtension(&psc->base, "GLX_OML_sync_control");
    __glXEnableDirectExtension(&psc->base, "GLX_SGI_video_sync");
 

src/glx/drisw_glx.c

@@ -931,6 +931,7 @@ driswCreateScreen(int screen, struct glx_display *priv, enum glx_driver glx_driv
    psp = &psc->vtable;
    psc->base.driScreen = psp;
    psc->base.frontend_screen = psc->driScreen;
+   psc->base.can_EXT_texture_from_pixmap = true;
    psp->destroyScreen = driswDestroyScreen;
    psp->createDrawable = driswCreateDrawable;
    psp->swapBuffers = driswSwapBuffers;

src/glx/glxclient.h

@@ -514,6 +514,7 @@ struct glx_screen
    bool force_direct_context;
    bool allow_invalid_glx_destroy_window;
    bool keep_native_window_glx_drawable;
+   bool can_EXT_texture_from_pixmap;
 
    char *driverName;