gallium/dri: Move the backendVtable InitScreen func into __DRI_MESA.

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

include/GL/internal/mesa_interface.h

@@ -35,6 +35,8 @@ typedef struct __DRImesaCoreExtensionRec __DRImesaCoreExtension;
 #define __DRI_MESA "DRI_Mesa"
 #define __DRI_MESA_VERSION 1
 
+struct dri_screen;
+
 /**  Core struct that appears alongside __DRI_CORE for Mesa-internal usage.
  * Implemented in the top-level dri/drisw/kopper extension list.
  */
@@ -54,6 +56,9 @@ struct __DRImesaCoreExtensionRec {
     * be -1.
     */
    __DRIcreateNewScreen2Func createNewScreen;
+
+   /* driver function for finishing initialization inside createNewScreen(). */
+   const __DRIconfig **(*initScreen)(struct dri_screen *screen);
 };
 
 #endif /* MESA_INTERFACE_H */

src/gallium/frontends/dri/dri2.c

@@ -2397,20 +2397,11 @@ release_pipe:
    return NULL;
 }
 
-/**
- * DRI driver virtual function table.
- *
- * DRI versions differ in their implementation of init_screen and swap_buffers.
- */
-static const struct __DRIBackendVtableExtensionRec galliumdrm_vtable = {
-   .base = { __DRI_BACKEND_VTABLE, 1 },
-   .InitScreen = dri2_init_screen,
-};
-
 static const struct __DRImesaCoreExtensionRec mesaCoreExtension = {
    .base = { __DRI_MESA, 1 },
    .version_string = MESA_INTERFACE_VERSION_STRING,
    .createNewScreen = driCreateNewScreen2,
+   .initScreen = dri2_init_screen,
 };
 
 /* This is the table of extensions that the loader will dlsym() for. */
@@ -2420,29 +2411,22 @@ const __DRIextension *galliumdrm_driver_extensions[] = {
     &driImageDriverExtension.base,
     &driDRI2Extension.base,
     &gallium_config_options.base,
-    &galliumdrm_vtable.base,
     NULL
 };
 
-/**
- * DRI driver virtual function table.
- *
- * KMS/DRM version of the DriverAPI above sporting a different InitScreen
- * hook. The latter is used to explicitly initialise the kms_swrast driver
- * rather than selecting the approapriate driver as suggested by the loader.
- */
-static const struct __DRIBackendVtableExtensionRec dri_swrast_kms_vtable = {
-   .base = { __DRI_BACKEND_VTABLE, 1 },
-   .InitScreen = dri_swrast_kms_init_screen,
+static const struct __DRImesaCoreExtensionRec swkmsMesaCoreExtension = {
+   .base = { __DRI_MESA, 1 },
+   .version_string = MESA_INTERFACE_VERSION_STRING,
+   .createNewScreen = driCreateNewScreen2,
+   .initScreen = dri_swrast_kms_init_screen,
 };
 
 const __DRIextension *dri_swrast_kms_driver_extensions[] = {
     &driCoreExtension.base,
-    &mesaCoreExtension.base,
+    &swkmsMesaCoreExtension.base,
     &driImageDriverExtension.base,
     &swkmsDRI2Extension.base,
     &gallium_config_options.base,
-    &dri_swrast_kms_vtable.base,
     NULL
 };
 

src/gallium/frontends/dri/dri_util.c

@@ -52,6 +52,7 @@
 #include "main/debug_output.h"
 #include "main/errors.h"
 #include "loader/loader.h"
+#include "GL/internal/mesa_interface.h"
 
 driOptionDescription __dri2ConfigOptions[] = {
       DRI_CONF_SECTION_DEBUG
@@ -102,7 +103,7 @@ driCreateNewScreen2(int scrn, int fd,
 {
     static const __DRIextension *emptyExtensionList[] = { NULL };
     struct dri_screen *screen;
-    const struct __DRIBackendVtableExtensionRec *backend = NULL;
+    const __DRImesaCoreExtension *mesa = NULL;
 
     screen = CALLOC_STRUCT(dri_screen);
     if (!screen)
@@ -110,8 +111,8 @@ driCreateNewScreen2(int scrn, int fd,
 
     assert(driver_extensions);
     for (int i = 0; driver_extensions[i]; i++) {
-       if (strcmp(driver_extensions[i]->name, __DRI_BACKEND_VTABLE) == 0) {
-          backend = (__DRIBackendVtableExtension *)driver_extensions[i];
+       if (strcmp(driver_extensions[i]->name, __DRI_MESA) == 0) {
+          mesa = (__DRImesaCoreExtension *)driver_extensions[i];
        }
     }
 
@@ -124,7 +125,7 @@ driCreateNewScreen2(int scrn, int fd,
 
     screen->loaderPrivate = data;
 
-    /* This will be filled in by backend->InitScreen(). */
+    /* This will be filled in by mesa->initScreen(). */
     screen->extensions = emptyExtensionList;
     screen->fd = fd;
     screen->myNum = scrn;
@@ -135,7 +136,7 @@ driCreateNewScreen2(int scrn, int fd,
     driParseConfigFiles(&screen->optionCache, &screen->optionInfo, screen->myNum,
                         "dri2", NULL, NULL, NULL, 0, NULL, 0);
 
-    *driver_configs = backend->InitScreen(screen);
+    *driver_configs = mesa->initScreen(screen);
     if (*driver_configs == NULL) {
         free(screen);
         return NULL;

src/gallium/frontends/dri/dri_util.h

@@ -47,11 +47,6 @@ struct dri_screen;
 
 #define __DRI_BACKEND_VTABLE "DRI_DriverVtable"
 
-typedef struct __DRIBackendVtableExtensionRec {
-    __DRIextension base;
-    const __DRIconfig **(*InitScreen)(struct dri_screen *screen);
-} __DRIBackendVtableExtension;
-
 struct __DRIconfigRec {
     struct gl_config modes;
 };

src/gallium/frontends/dri/drisw.c

@@ -605,16 +605,6 @@ fail:
    return NULL;
 }
 
-/**
- * DRI driver virtual function table.
- *
- * DRI versions differ in their implementation of init_screen and swap_buffers.
- */
-static const struct __DRIBackendVtableExtensionRec galliumsw_vtable = {
-   .base = { __DRI_BACKEND_VTABLE, 1 },
-   .InitScreen = drisw_init_screen,
-};
-
 /* swrast copy sub buffer entrypoint. */
 static void driswCopySubBuffer(__DRIdrawable *pdp, int x, int y,
                                int w, int h)
@@ -637,6 +627,7 @@ static const struct __DRImesaCoreExtensionRec mesaCoreExtension = {
    .base = { __DRI_MESA, 1 },
    .version_string = MESA_INTERFACE_VERSION_STRING,
    .createNewScreen = driCreateNewScreen2,
+   .initScreen = drisw_init_screen,
 };
 
 /* This is the table of extensions that the loader will dlsym() for. */
@@ -646,7 +637,6 @@ const __DRIextension *galliumsw_driver_extensions[] = {
     &driSWRastExtension.base,
     &driSWCopySubBufferExtension.base,
     &gallium_config_options.base,
-    &galliumsw_vtable.base,
     NULL
 };
 

src/gallium/frontends/dri/kopper.c

@@ -951,15 +951,11 @@ const __DRIkopperExtension driKopperExtension = {
    .queryBufferAge             = kopperQueryBufferAge,
 };
 
-static const struct __DRIBackendVtableExtensionRec galliumvk_vtable = {
-   .base = { __DRI_BACKEND_VTABLE, 1 },
-   .InitScreen = kopper_init_screen,
-};
-
 static const struct __DRImesaCoreExtensionRec mesaCoreExtension = {
    .base = { __DRI_MESA, 1 },
    .version_string = MESA_INTERFACE_VERSION_STRING,
    .createNewScreen = driCreateNewScreen2,
+   .initScreen = kopper_init_screen,
 };
 
 const __DRIextension *galliumvk_driver_extensions[] = {
@@ -970,7 +966,6 @@ const __DRIextension *galliumvk_driver_extensions[] = {
    &driImageDriverExtension.base,
    &driKopperExtension.base,
    &gallium_config_options.base,
-   &galliumvk_vtable.base,
    NULL
 };