frontend/dri: move callbacks from the VTable into dri_screen, dri_drawable

This just moves the callbacks and renames the functions.
Some functions had to be moved up because they are initialized there.
Remove some obsolete comments.

Reviewed-by: Adam Jackson <ajax@redhat.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/19741>

src/gallium/frontends/dri/dri2.c

@@ -2275,6 +2275,23 @@ dri2_init_screen_extensions(struct dri_screen *screen,
    assert(!*nExt);
 }
 
+static struct dri_drawable *
+dri2_create_drawable(struct dri_screen *screen, const struct gl_config *visual,
+                     boolean isPixmap, void *loaderPrivate)
+{
+   struct dri_drawable *drawable = dri_create_drawable(screen, visual, isPixmap,
+                                                       loaderPrivate);
+   if (!drawable)
+      return NULL;
+
+   drawable->allocate_textures = dri2_allocate_textures;
+   drawable->flush_frontbuffer = dri2_flush_frontbuffer;
+   drawable->update_tex_buffer = dri2_update_tex_buffer;
+   drawable->flush_swapbuffers = dri2_flush_swapbuffers;
+
+   return drawable;
+}
+
 /**
  * This is the driver specific part of the createNewScreen entry point.
  *
@@ -2320,6 +2337,10 @@ dri2_init_screen(struct dri_screen *screen)
       screen->lookup_egl_image_validated = dri2_lookup_egl_image_validated;
    }
 
+   screen->create_drawable = dri2_create_drawable;
+   screen->allocate_buffer = dri2_allocate_buffer;
+   screen->release_buffer = dri2_release_buffer;
+
    return configs;
 
 destroy_screen:
@@ -2386,35 +2407,14 @@ release_pipe:
    return NULL;
 }
 
-static struct dri_drawable *
-dri2_create_buffer(struct dri_screen *screen, const struct gl_config *visual,
-                   boolean isPixmap, void *loaderPrivate)
-{
-   struct dri_drawable *drawable = dri_create_buffer(screen, visual, isPixmap,
-                                                     loaderPrivate);
-   if (!drawable)
-      return NULL;
-
-   drawable->allocate_textures = dri2_allocate_textures;
-   drawable->flush_frontbuffer = dri2_flush_frontbuffer;
-   drawable->update_tex_buffer = dri2_update_tex_buffer;
-   drawable->flush_swapbuffers = dri2_flush_swapbuffers;
-
-   return drawable;
-}
-
 /**
  * DRI driver virtual function table.
  *
  * DRI versions differ in their implementation of init_screen and swap_buffers.
  */
-static const struct __DRIDriverVtableExtensionRec galliumdrm_vtable = {
-   .base = { __DRI_DRIVER_VTABLE, 1 },
+static const struct __DRIBackendVtableExtensionRec galliumdrm_vtable = {
+   .base = { __DRI_BACKEND_VTABLE, 1 },
    .InitScreen = dri2_init_screen,
-   .CreateBuffer = dri2_create_buffer,
-
-   .AllocateBuffer = dri2_allocate_buffer,
-   .ReleaseBuffer  = dri2_release_buffer,
 };
 
 /* This is the table of extensions that the loader will dlsym() for. */
@@ -2434,13 +2434,9 @@ const __DRIextension *galliumdrm_driver_extensions[] = {
  * 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 __DRIDriverVtableExtensionRec dri_swrast_kms_vtable = {
-   .base = { __DRI_DRIVER_VTABLE, 1 },
+static const struct __DRIBackendVtableExtensionRec dri_swrast_kms_vtable = {
+   .base = { __DRI_BACKEND_VTABLE, 1 },
    .InitScreen = dri_swrast_kms_init_screen,
-   .CreateBuffer = dri2_create_buffer,
-
-   .AllocateBuffer = dri2_allocate_buffer,
-   .ReleaseBuffer  = dri2_release_buffer,
 };
 
 const __DRIextension *dri_swrast_kms_driver_extensions[] = {

src/gallium/frontends/dri/dri_drawable.c

@@ -143,8 +143,8 @@ dri_st_framebuffer_flush_swapbuffers(struct st_context_iface *stctx,
  * This is called when we need to set up GL rendering to a new X window.
  */
 struct dri_drawable *
-dri_create_buffer(struct dri_screen *screen, const struct gl_config *visual,
-                  bool isPixmap, void *loaderPrivate)
+dri_create_drawable(struct dri_screen *screen, const struct gl_config *visual,
+                    bool isPixmap, void *loaderPrivate)
 {
    struct dri_drawable *drawable = NULL;
 
@@ -184,7 +184,7 @@ fail:
 }
 
 static void
-dri_destroy_buffer(struct dri_drawable *drawable)
+dri_destroy_drawable(struct dri_drawable *drawable)
 {
    struct dri_screen *screen = drawable->screen;
    int i;
@@ -212,7 +212,7 @@ dri_put_drawable(struct dri_drawable *drawable)
         if (drawable->refcount)
             return;
 
-        dri_destroy_buffer(drawable);
+        dri_destroy_drawable(drawable);
     }
 }
 

src/gallium/frontends/dri/dri_drawable.h

@@ -112,6 +112,8 @@ struct dri_drawable
                              struct pipe_resource *res);
    void (*flush_swapbuffers)(struct dri_context *ctx,
                              struct dri_drawable *drawable);
+
+   void (*swap_buffers)(struct dri_drawable *drawable);
 };
 
 /* Typecast the opaque pointer to our own type. */
@@ -138,8 +140,8 @@ dri_get_drawable(struct dri_drawable *drawable)
  * dri_drawable.c
  */
 struct dri_drawable *
-dri_create_buffer(struct dri_screen *screen, const struct gl_config *visual,
-                  bool isPixmap, void *loaderPrivate);
+dri_create_drawable(struct dri_screen *screen, const struct gl_config *visual,
+                    bool isPixmap, void *loaderPrivate);
 
 void
 dri_put_drawable(struct dri_drawable *drawable);

src/gallium/frontends/dri/dri_screen.h

@@ -53,9 +53,6 @@ struct dri_screen
    struct st_manager base;
 
    /* dri */
-   /* Backend-specific entrypoints (dri, swrast, kopper) */
-   const struct __DRIDriverVtableExtensionRec *driver;
-
    /* Current screen's number */
    int myNum;
 
@@ -140,6 +137,18 @@ struct dri_screen
    bool has_dmabuf;
    bool has_modifiers;
    bool is_sw;
+
+   struct dri_drawable *(*create_drawable)(struct dri_screen *screen,
+                                           const struct gl_config *glVis,
+                                           GLboolean pixmapBuffer,
+                                           void *loaderPrivate);
+
+   __DRIbuffer *(*allocate_buffer)(struct dri_screen *screen,
+                                   unsigned int attachment,
+                                   unsigned int format,
+                                   int width, int height);
+
+   void (*release_buffer)(__DRIbuffer *buffer);
 };
 
 /** cast wrapper */

src/gallium/frontends/dri/dri_util.c

@@ -110,6 +110,7 @@ driCreateNewScreen2(int scrn, int fd,
 {
     static const __DRIextension *emptyExtensionList[] = { NULL };
     struct dri_screen *screen;
+    const struct __DRIBackendVtableExtensionRec *backend = NULL;
 
     screen = CALLOC_STRUCT(dri_screen);
     if (!screen)
@@ -117,9 +118,8 @@ driCreateNewScreen2(int scrn, int fd,
 
     assert(driver_extensions);
     for (int i = 0; driver_extensions[i]; i++) {
-       if (strcmp(driver_extensions[i]->name, __DRI_DRIVER_VTABLE) == 0) {
-          screen->driver =
-             (__DRIDriverVtableExtension *)driver_extensions[i];
+       if (strcmp(driver_extensions[i]->name, __DRI_BACKEND_VTABLE) == 0) {
+          backend = (__DRIBackendVtableExtension *)driver_extensions[i];
        }
     }
 
@@ -142,7 +142,7 @@ driCreateNewScreen2(int scrn, int fd,
     driParseConfigFiles(&screen->optionCache, &screen->optionInfo, screen->myNum,
                         "dri2", NULL, NULL, NULL, 0, NULL, 0);
 
-    *driver_configs = screen->driver->InitScreen(screen);
+    *driver_configs = backend->InitScreen(screen);
     if (*driver_configs == NULL) {
         free(screen);
         return NULL;
@@ -745,7 +745,7 @@ driCreateNewDrawable(__DRIscreen *psp,
 
     struct dri_screen *screen = dri_screen(psp);
     struct dri_drawable *drawable =
-       screen->driver->CreateBuffer(screen, &config->modes, GL_FALSE, data);
+       screen->create_drawable(screen, &config->modes, GL_FALSE, data);
 
     return opaque_dri_drawable(drawable);
 }
@@ -763,8 +763,7 @@ dri2AllocateBuffer(__DRIscreen *psp,
 {
    struct dri_screen *screen = dri_screen(psp);
 
-   return screen->driver->AllocateBuffer(screen, attachment, format,
-                                         width, height);
+   return screen->allocate_buffer(screen, attachment, format, width, height);
 }
 
 static void
@@ -772,7 +771,7 @@ dri2ReleaseBuffer(__DRIscreen *psp, __DRIbuffer *buffer)
 {
    struct dri_screen *screen = dri_screen(psp);
 
-   screen->driver->ReleaseBuffer(buffer);
+   screen->release_buffer(buffer);
 }
 
 
@@ -848,7 +847,7 @@ driSwapBuffers(__DRIdrawable *pdp)
 
    assert(drawable->screen->swrast_loader);
 
-   drawable->screen->driver->SwapBuffers(drawable);
+   drawable->swap_buffers(drawable);
 }
 
 /** Core interface */

src/gallium/frontends/dri/dri_util.h

@@ -27,29 +27,10 @@
  * \file dri_util.h
  * DRI utility functions definitions.
  *
- * This module acts as glue between GLX and the actual hardware driver.  A DRI
- * driver doesn't really \e have to use any of this - it's optional.  But, some
- * useful stuff is done here that otherwise would have to be duplicated in most
- * drivers.
- *
- * Basically, these utility functions take care of some of the dirty details of
- * screen initialization, context creation, context binding, DRM setup, etc.
- *
- * These functions are compiled into each DRI driver so libGL.so knows nothing
- * about them.
- *
- * \sa dri_util.c.
- *
  * \author Kevin E. Martin <kevin@precisioninsight.com>
  * \author Brian Paul <brian@precisioninsight.com>
  */
 
-/**
- * The following structs are shared between DRISW and DRI2, the DRISW structs
- * are essentially base classes of the DRI2 structs. DRISW needs to compile on
- * platforms without DRM, so keep the structs opaque to DRM.
- */
-
 #ifndef _DRI_UTIL_H_
 #define _DRI_UTIL_H_
 
@@ -62,29 +43,14 @@
 #include "util/xmlconfig.h"
 #include <stdbool.h>
 
-#define __DRI_DRIVER_VTABLE "DRI_DriverVtable"
-
 struct dri_screen;
 
-typedef struct __DRIDriverVtableExtensionRec {
+#define __DRI_BACKEND_VTABLE "DRI_DriverVtable"
+
+typedef struct __DRIBackendVtableExtensionRec {
     __DRIextension base;
-
     const __DRIconfig **(*InitScreen)(struct dri_screen *screen);
-
-    struct dri_drawable *(*CreateBuffer)(struct dri_screen *screen,
-                                         const struct gl_config *glVis,
-                                         GLboolean pixmapBuffer,
-                                         void *loaderPrivate);
-
-    void (*SwapBuffers)(struct dri_drawable *drawable);
-
-    __DRIbuffer *(*AllocateBuffer)(struct dri_screen *screen,
-                                   unsigned int attachment,
-                                   unsigned int format,
-                                   int width, int height);
-
-    void (*ReleaseBuffer)(__DRIbuffer *buffer);
-} __DRIDriverVtableExtension;
+} __DRIBackendVtableExtension;
 
 struct __DRIconfigRec {
     struct gl_config modes;

src/gallium/frontends/dri/drisw.c

@@ -523,6 +523,24 @@ static const struct drisw_loader_funcs drisw_shm_lf = {
    .put_image_shm = drisw_put_image_shm
 };
 
+static struct dri_drawable *
+drisw_create_drawable(struct dri_screen *screen, const struct gl_config * visual,
+                      boolean isPixmap, void *loaderPrivate)
+{
+   struct dri_drawable *drawable = dri_create_drawable(screen, visual, isPixmap,
+                                                       loaderPrivate);
+   if (!drawable)
+      return NULL;
+
+   drawable->allocate_textures = drisw_allocate_textures;
+   drawable->update_drawable_info = drisw_update_drawable_info;
+   drawable->flush_frontbuffer = drisw_flush_frontbuffer;
+   drawable->update_tex_buffer = drisw_update_tex_buffer;
+   drawable->swap_buffers = drisw_swap_buffers;
+
+   return drawable;
+}
+
 static const __DRIconfig **
 drisw_init_screen(struct dri_screen *screen)
 {
@@ -574,6 +592,8 @@ drisw_init_screen(struct dri_screen *screen)
       screen->lookup_egl_image_validated = dri2_lookup_egl_image_validated;
    }
 
+   screen->create_drawable = drisw_create_drawable;
+
    return configs;
 fail:
    dri_destroy_screen_helper(screen);
@@ -583,33 +603,14 @@ fail:
    return NULL;
 }
 
-static struct dri_drawable *
-drisw_create_buffer(struct dri_screen *screen, const struct gl_config * visual,
-                    boolean isPixmap, void *loaderPrivate)
-{
-   struct dri_drawable *drawable = dri_create_buffer(screen, visual, isPixmap,
-                                                     loaderPrivate);
-   if (!drawable)
-      return NULL;
-
-   drawable->allocate_textures = drisw_allocate_textures;
-   drawable->update_drawable_info = drisw_update_drawable_info;
-   drawable->flush_frontbuffer = drisw_flush_frontbuffer;
-   drawable->update_tex_buffer = drisw_update_tex_buffer;
-
-   return drawable;
-}
-
 /**
  * DRI driver virtual function table.
  *
  * DRI versions differ in their implementation of init_screen and swap_buffers.
  */
-static const struct __DRIDriverVtableExtensionRec galliumsw_vtable = {
-   .base = { __DRI_DRIVER_VTABLE, 1 },
+static const struct __DRIBackendVtableExtensionRec galliumsw_vtable = {
+   .base = { __DRI_BACKEND_VTABLE, 1 },
    .InitScreen = drisw_init_screen,
-   .CreateBuffer = drisw_create_buffer,
-   .SwapBuffers = drisw_swap_buffers,
 };
 
 /* swrast copy sub buffer entrypoint. */

src/gallium/frontends/dri/kopper.c

@@ -55,6 +55,10 @@
 extern const __DRIimageExtension driVkImageExtension;
 extern const __DRIimageExtension driVkImageExtensionSw;
 
+static struct dri_drawable *
+kopper_create_drawable(struct dri_screen *screen, const struct gl_config *visual,
+                       boolean isPixmap, void *loaderPrivate);
+
 static void
 kopper_flush_drawable(__DRIdrawable *dPriv)
 {
@@ -167,6 +171,8 @@ kopper_init_screen(struct dri_screen *screen)
       screen->lookup_egl_image_validated = dri2_lookup_egl_image_validated;
    }
 
+   screen->create_drawable = kopper_create_drawable;
+
    return configs;
 fail:
    dri_destroy_screen_helper(screen);
@@ -812,13 +818,16 @@ kopper_flush_swapbuffers(struct dri_context *ctx,
    /* does this actually need to do anything? */
 }
 
+static void
+kopper_swap_buffers(struct dri_drawable *drawable);
+
 static struct dri_drawable *
-kopper_create_buffer(struct dri_screen *screen, const struct gl_config *visual,
-                     boolean isPixmap, void *loaderPrivate)
+kopper_create_drawable(struct dri_screen *screen, const struct gl_config *visual,
+                       boolean isPixmap, void *loaderPrivate)
 {
    /* always pass !pixmap because it isn't "handled" or relevant */
-   struct dri_drawable *drawable = dri_create_buffer(screen, visual, false,
-                                                     loaderPrivate);
+   struct dri_drawable *drawable = dri_create_drawable(screen, visual, false,
+                                                       loaderPrivate);
    if (!drawable)
       return NULL;
 
@@ -832,6 +841,7 @@ kopper_create_buffer(struct dri_screen *screen, const struct gl_config *visual,
    drawable->flush_frontbuffer = kopper_flush_frontbuffer;
    drawable->update_tex_buffer = kopper_update_tex_buffer;
    drawable->flush_swapbuffers = kopper_flush_swapbuffers;
+   drawable->swap_buffers = kopper_swap_buffers;
 
    drawable->info.has_alpha = visual->alphaBits > 0;
    if (screen->kopper_loader->SetSurfaceCreateInfo)
@@ -898,7 +908,7 @@ kopperCreateNewDrawable(__DRIscreen *psp,
 
     struct dri_screen *screen = dri_screen(psp);
     struct dri_drawable *drawable =
-       screen->driver->CreateBuffer(screen, &config->modes, is_pixmap, data);
+       screen->create_drawable(screen, &config->modes, is_pixmap, data);
 
     return opaque_dri_drawable(drawable);
 }
@@ -948,11 +958,9 @@ const __DRIkopperExtension driKopperExtension = {
    .queryBufferAge             = kopperQueryBufferAge,
 };
 
-static const struct __DRIDriverVtableExtensionRec galliumvk_vtable = {
-   .base = { __DRI_DRIVER_VTABLE, 1 },
+static const struct __DRIBackendVtableExtensionRec galliumvk_vtable = {
+   .base = { __DRI_BACKEND_VTABLE, 1 },
    .InitScreen = kopper_init_screen,
-   .CreateBuffer = kopper_create_buffer,
-   .SwapBuffers = kopper_swap_buffers,
 };
 
 const __DRIextension *galliumvk_driver_extensions[] = {