drisw: hook up EXT_buffer_age

drisw only has a single drawable, which means the buffer age is always 1

Acked-by: Daniel Stone <daniels@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/27554>

include/GL/internal/dri_interface.h

@@ -913,7 +913,7 @@ struct __DRIframebufferRec {
  * extension.  Version 1 is required by the X server, and version 3 is used.
  */
 #define __DRI_SWRAST "DRI_SWRast"
-#define __DRI_SWRAST_VERSION 4
+#define __DRI_SWRAST_VERSION 5
 
 struct __DRIswrastExtensionRec {
     __DRIextension base;
@@ -960,6 +960,10 @@ struct __DRIswrastExtensionRec {
                                     const __DRIextension **driver_extensions,
                                     const __DRIconfig ***driver_configs,
                                     void *loaderPrivate);
+   /**
+    * \since version 5
+   */
+   int (*queryBufferAge)(__DRIdrawable *drawable);
 
 };
 

src/egl/drivers/dri2/platform_wayland.c

@@ -2636,6 +2636,16 @@ dri2_wl_swrast_swap_buffers(_EGLDisplay *disp, _EGLSurface *draw)
    return EGL_TRUE;
 }
 
+static EGLint
+dri2_wl_swrast_query_buffer_age(_EGLDisplay *disp, _EGLSurface *surface)
+{
+   struct dri2_egl_display *dri2_dpy = dri2_egl_display(disp);
+   struct dri2_egl_surface *dri2_surf = dri2_egl_surface(surface);
+
+   assert(dri2_dpy->swrast);
+   return dri2_dpy->swrast->queryBufferAge(dri2_surf->dri_drawable);
+}
+
 static void
 shm_handle_format(void *data, struct wl_shm *shm, uint32_t format)
 {
@@ -2692,6 +2702,7 @@ static const struct dri2_egl_display_vtbl dri2_wl_swrast_display_vtbl = {
    .create_image = dri2_create_image_khr,
    .swap_buffers = dri2_wl_swrast_swap_buffers,
    .get_dri_drawable = dri2_surface_get_dri_drawable,
+   .query_buffer_age = dri2_wl_swrast_query_buffer_age,
 };
 
 static const __DRIswrastLoaderExtension swrast_loader_extension = {
@@ -2812,6 +2823,7 @@ dri2_initialize_wayland_swrast(_EGLDisplay *disp)
    if (disp->Options.Zink && dri2_dpy->fd_render_gpu >= 0 &&
        (dri2_dpy->wl_dmabuf || dri2_dpy->wl_drm))
       dri2_set_WL_bind_wayland_display(disp);
+   disp->Extensions.EXT_buffer_age = EGL_TRUE;
    disp->Extensions.EXT_swap_buffers_with_damage = EGL_TRUE;
    disp->Extensions.EXT_present_opaque = EGL_TRUE;
 

src/egl/drivers/dri2/platform_x11.c

@@ -1321,6 +1321,16 @@ dri2_kopper_query_buffer_age(_EGLDisplay *disp, _EGLSurface *surf)
    return 0;
 }
 
+static EGLint
+dri2_swrast_query_buffer_age(_EGLDisplay *disp, _EGLSurface *surf)
+{
+   struct dri2_egl_display *dri2_dpy = dri2_egl_display(disp);
+   struct dri2_egl_surface *dri2_surf = dri2_egl_surface(surf);
+
+   assert(dri2_dpy->swrast);
+   return dri2_dpy->swrast->queryBufferAge(dri2_surf->dri_drawable);
+}
+
 static const struct dri2_egl_display_vtbl dri2_x11_swrast_display_vtbl = {
    .authenticate = NULL,
    .create_window_surface = dri2_x11_create_window_surface,
@@ -1332,6 +1342,7 @@ static const struct dri2_egl_display_vtbl dri2_x11_swrast_display_vtbl = {
    .swap_buffers_region = dri2_x11_swap_buffers_region,
    .post_sub_buffer = dri2_x11_post_sub_buffer,
    .copy_buffers = dri2_x11_copy_buffers,
+   .query_buffer_age = dri2_swrast_query_buffer_age,
    /* XXX: should really implement this since X11 has pixmaps */
    .query_surface = dri2_query_surface,
    .get_msc_rate = dri2_x11_get_msc_rate,
@@ -1549,12 +1560,12 @@ dri2_initialize_x11_swrast(_EGLDisplay *disp)
          disp->Extensions.KHR_image_pixmap = EGL_TRUE;
       disp->Extensions.NOK_texture_from_pixmap = EGL_TRUE;
       disp->Extensions.CHROMIUM_sync_control = EGL_TRUE;
-      disp->Extensions.EXT_buffer_age = EGL_TRUE;
       disp->Extensions.EXT_swap_buffers_with_damage = EGL_TRUE;
 
       if (dri2_dpy->multibuffers_available)
          dri2_set_WL_bind_wayland_display(disp);
    }
+   disp->Extensions.EXT_buffer_age = EGL_TRUE;
    disp->Extensions.ANGLE_sync_control_rate = EGL_TRUE;
 
    if (!dri2_x11_add_configs_for_visuals(dri2_dpy, disp, !disp->Options.Zink))

src/gallium/frontends/dri/dri_drawable.h

@@ -84,6 +84,9 @@ struct dri_drawable
    unsigned int lastStamp;
    int w, h;
 
+   /* generic for swrast */
+   unsigned buffer_age;
+
    /* kopper */
    struct kopper_loader_info info;
    __DRIimage   *image; //texture_from_pixmap

src/gallium/frontends/dri/dri_util.c

@@ -751,6 +751,7 @@ driCreateNewDrawable(__DRIscreen *psp,
     struct dri_screen *screen = dri_screen(psp);
     struct dri_drawable *drawable =
        screen->create_drawable(screen, &config->modes, GL_FALSE, data);
+   drawable->buffer_age = 0;
 
     return opaque_dri_drawable(drawable);
 }
@@ -855,6 +856,13 @@ driSwapBuffers(__DRIdrawable *pdp)
    drawable->swap_buffers(drawable);
 }
 
+static int
+driSWRastQueryBufferAge(__DRIdrawable *pdp)
+{
+   struct dri_drawable *drawable = dri_drawable(pdp);
+   return drawable->buffer_age;
+}
+
 /** Core interface */
 const __DRIcoreExtension driCoreExtension = {
     .base = { __DRI_CORE, 2 },
@@ -915,6 +923,7 @@ const __DRIswrastExtension driSWRastExtension = {
     .createNewContextForAPI     = driCreateNewContextForAPI,
     .createContextAttribs       = driCreateContextAttribs,
     .createNewScreen2           = driSWRastCreateNewScreen2,
+    .queryBufferAge             = driSWRastQueryBufferAge,
 };
 
 const __DRI2configQueryExtension dri2ConfigQueryExtension = {

src/gallium/frontends/dri/drisw.c

@@ -256,6 +256,7 @@ drisw_swap_buffers(struct dri_drawable *drawable)
                                         fence, OS_TIMEOUT_INFINITE);
       screen->base.screen->fence_reference(screen->base.screen, &fence, NULL);
       drisw_copy_to_front(ctx->st->pipe, drawable, ptex);
+      drawable->buffer_age = 1;
 
       /* TODO: remove this if the framebuffer state doesn't change. */
       st_context_invalidate_state(ctx->st, ST_INVALIDATE_FB_STATE);
@@ -370,6 +371,7 @@ drisw_allocate_textures(struct dri_context *stctx,
          pipe_resource_reference(&drawable->textures[i], NULL);
          pipe_resource_reference(&drawable->msaa_textures[i], NULL);
       }
+      drawable->buffer_age = 0;
    }
 
    memset(&templ, 0, sizeof(templ));