dri: Add createNewScreen into the __DRI_MESA extension.

Now the loaders don't have to switch on dri2/dri3/swrast.

Reviewed-by: Adam Jackson <ajax@redhat.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/20069>

include/GL/internal/mesa_interface.h

@@ -46,6 +46,14 @@ struct __DRImesaCoreExtensionRec {
     */
 #define MESA_INTERFACE_VERSION_STRING PACKAGE_VERSION MESA_GIT_SHA1
    const char *version_string;
+
+   /* Screen creation function regardless of DRI2, image, or swrast backend.
+    * (Nothing uses the old __DRI_CORE screen create).
+    *
+    * If not associated with a DRM fd (non-swkms swrast), the fd argument should
+    * be -1.
+    */
+   __DRIcreateNewScreen2Func createNewScreen;
 };
 
 #endif /* MESA_INTERFACE_H */

src/egl/drivers/dri2/egl_dri2.c

@@ -1008,26 +1008,12 @@ dri2_create_screen(_EGLDisplay *disp)
 {
    struct dri2_egl_display *dri2_dpy = dri2_egl_display(disp);
 
-   if (dri2_dpy->image_driver) {
-      dri2_dpy->dri_screen =
-         dri2_dpy->image_driver->createNewScreen2(0, dri2_dpy->fd,
+   int screen_fd = dri2_dpy->swrast ? -1 : dri2_dpy->fd;
+   dri2_dpy->dri_screen = dri2_dpy->mesa->createNewScreen(0, screen_fd,
                                                           dri2_dpy->loader_extensions,
                                                           dri2_dpy->driver_extensions,
                                                           &dri2_dpy->driver_configs,
                                                           disp);
-   } else if (dri2_dpy->dri2) {
-      dri2_dpy->dri_screen =
-         dri2_dpy->dri2->createNewScreen2(0, dri2_dpy->fd,
-                                          dri2_dpy->loader_extensions,
-                                          dri2_dpy->driver_extensions,
-                                          &dri2_dpy->driver_configs, disp);
-   } else {
-      assert(dri2_dpy->swrast);
-      dri2_dpy->dri_screen =
-         dri2_dpy->swrast->createNewScreen2(0, dri2_dpy->loader_extensions,
-                                             dri2_dpy->driver_extensions,
-                                             &dri2_dpy->driver_configs, disp);
-   }
 
    if (dri2_dpy->dri_screen == NULL) {
       _eglLog(_EGL_WARNING, "egl: failed to create dri2 screen");

src/gallium/frontends/dri/dri2.c

@@ -2410,6 +2410,7 @@ static const struct __DRIBackendVtableExtensionRec galliumdrm_vtable = {
 static const struct __DRImesaCoreExtensionRec mesaCoreExtension = {
    .base = { __DRI_MESA, 1 },
    .version_string = MESA_INTERFACE_VERSION_STRING,
+   .createNewScreen = driCreateNewScreen2,
 };
 
 /* This is the table of extensions that the loader will dlsym() for. */

src/gallium/frontends/dri/dri_util.c

@@ -94,7 +94,7 @@ setupLoaderExtensions(struct dri_screen *screen,
  * It's used to create global state for the driver across contexts on the same
  * Display.
  */
-static __DRIscreen *
+__DRIscreen *
 driCreateNewScreen2(int scrn, int fd,
                     const __DRIextension **loader_extensions,
                     const __DRIextension **driver_extensions,

src/gallium/frontends/dri/dri_util.h

@@ -108,6 +108,12 @@ struct __DriverContextConfig {
 #define __DRIVER_CONTEXT_ATTRIB_NO_ERROR         (1 << 3)
 #define __DRIVER_CONTEXT_ATTRIB_PROTECTED        (1 << 4)
 
+__DRIscreen *
+driCreateNewScreen2(int scrn, int fd,
+                    const __DRIextension **loader_extensions,
+                    const __DRIextension **driver_extensions,
+                    const __DRIconfig ***driver_configs, void *data);
+
 extern uint32_t
 driGLFormatToImageFormat(mesa_format format);
 

src/gallium/frontends/dri/drisw.c

@@ -636,6 +636,7 @@ const __DRIcopySubBufferExtension driSWCopySubBufferExtension = {
 static const struct __DRImesaCoreExtensionRec mesaCoreExtension = {
    .base = { __DRI_MESA, 1 },
    .version_string = MESA_INTERFACE_VERSION_STRING,
+   .createNewScreen = driCreateNewScreen2,
 };
 
 /* This is the table of extensions that the loader will dlsym() for. */

src/gallium/frontends/dri/kopper.c

@@ -959,6 +959,7 @@ static const struct __DRIBackendVtableExtensionRec galliumvk_vtable = {
 static const struct __DRImesaCoreExtensionRec mesaCoreExtension = {
    .base = { __DRI_MESA, 1 },
    .version_string = MESA_INTERFACE_VERSION_STRING,
+   .createNewScreen = driCreateNewScreen2,
 };
 
 const __DRIextension *galliumvk_driver_extensions[] = {

src/gbm/backends/dri/gbm_dri.c

@@ -368,15 +368,14 @@ dri_screen_create_for_driver(struct gbm_dri_device *dri, char *driver_name)
    }
 
    dri->loader_extensions = gbm_dri_screen_extensions;
-
-   if (!swrast) {
-      dri->screen = dri->dri2->createNewScreen2(0, dri->base.v0.fd,
+   dri->screen = dri->mesa->createNewScreen(0, swrast ? -1 : dri->base.v0.fd,
                                             dri->loader_extensions,
                                             dri->driver_extensions,
                                             &dri->driver_configs, dri);
    if (dri->screen == NULL)
       return -1;
 
+   if (!swrast) {
       extensions = dri->core->getExtensions(dri->screen);
       if (!loader_bind_extensions(dri, dri_core_extensions,
                                   ARRAY_SIZE(dri_core_extensions),
@@ -384,12 +383,6 @@ dri_screen_create_for_driver(struct gbm_dri_device *dri, char *driver_name)
          ret = -1;
          goto free_screen;
       }
-   } else {
-      dri->screen = dri->swrast->createNewScreen2(0, dri->loader_extensions,
-                                                  dri->driver_extensions,
-                                                  &dri->driver_configs, dri);
-      if (dri->screen == NULL)
-         return -1;
    }
 
    dri->lookup_image = NULL;