Revert "Revert "st/dri2: Implement DRI2bufferDamageExtension""

This reverts commit 19546108d3.
This commit breaks the build because lima implements
->set_damage_region(). I guess we'll need more discussion before
removing the ->set_damage_region() hook.

src/gallium/drivers/panfrost/pan_screen.c

@@ -753,6 +753,7 @@ panfrost_create_screen(int fd, struct renderonly *ro)
         screen->base.get_compiler_options = panfrost_screen_get_compiler_options;
         screen->base.fence_reference = panfrost_fence_reference;
         screen->base.fence_finish = panfrost_fence_finish;
+        screen->base.set_damage_region = panfrost_resource_set_damage_region;
 
         panfrost_resource_screen_init(screen);
 

src/gallium/include/pipe/p_screen.h

@@ -483,6 +483,23 @@ struct pipe_screen {
    bool (*is_parallel_shader_compilation_finished)(struct pipe_screen *screen,
                                                    void *shader,
                                                    unsigned shader_type);
+
+   /**
+    * Set the damage region (called when KHR_partial_update() is invoked).
+    * This function is passed an array of rectangles encoding the damage area.
+    * rects are using the bottom-left origin convention.
+    * nrects = 0 means 'reset the damage region'. What 'reset' implies is HW
+    * specific. For tile-based renderers, the damage extent is typically set
+    * to cover the whole resource with no damage rect (or a 0-size damage
+    * rect). This way, the existing resource content is reloaded into the
+    * local tile buffer for every tile thus making partial tile update
+    * possible. For HW operating in immediate mode, this reset operation is
+    * likely to be a NOOP.
+    */
+   void (*set_damage_region)(struct pipe_screen *screen,
+                             struct pipe_resource *resource,
+                             unsigned int nrects,
+                             const struct pipe_box *rects);
 };
 
 

src/gallium/state_trackers/dri/dri2.c

@@ -1872,6 +1872,36 @@ static const __DRI2interopExtension dri2InteropExtension = {
    .export_object = dri2_interop_export_object
 };
 
+/**
+ * \brief the DRI2bufferDamageExtension set_damage_region method
+ */
+static void
+dri2_set_damage_region(__DRIdrawable *dPriv, unsigned int nrects, int *rects)
+{
+   struct dri_drawable *drawable = dri_drawable(dPriv);
+   struct pipe_resource *resource = drawable->textures[ST_ATTACHMENT_BACK_LEFT];
+   struct pipe_screen *screen = resource->screen;
+   struct pipe_box *boxes = NULL;
+
+   if (nrects) {
+      boxes = CALLOC(nrects, sizeof(*boxes));
+      assert(boxes);
+
+      for (unsigned int i = 0; i < nrects; i++) {
+         int *rect = &rects[i * 4];
+
+         u_box_2d(rect[0], rect[1], rect[2], rect[3], &boxes[i]);
+      }
+   }
+
+   screen->set_damage_region(screen, resource, nrects, boxes);
+   FREE(boxes);
+}
+
+static __DRI2bufferDamageExtension dri2BufferDamageExtension = {
+   .base = { __DRI2_BUFFER_DAMAGE, 1 },
+};
+
 /**
  * \brief the DRI2ConfigQueryExtension configQueryb method
  */
@@ -1973,6 +2003,7 @@ static const __DRIextension *dri_screen_extensions[] = {
    &dri2GalliumConfigQueryExtension.base,
    &dri2ThrottleExtension.base,
    &dri2FenceExtension.base,
+   &dri2BufferDamageExtension.base,
    &dri2InteropExtension.base,
    &dri2NoErrorExtension.base,
    &driBlobExtension.base,
@@ -1988,6 +2019,7 @@ static const __DRIextension *dri_robust_screen_extensions[] = {
    &dri2ThrottleExtension.base,
    &dri2FenceExtension.base,
    &dri2InteropExtension.base,
+   &dri2BufferDamageExtension.base,
    &dri2Robustness.base,
    &dri2NoErrorExtension.base,
    &driBlobExtension.base,
@@ -2050,6 +2082,9 @@ dri2_init_screen(__DRIscreen * sPriv)
       }
    }
 
+   if (pscreen->set_damage_region)
+      dri2BufferDamageExtension.set_damage_region = dri2_set_damage_region;
+
    if (pscreen->get_param(pscreen, PIPE_CAP_DEVICE_RESET_STATUS_QUERY)) {
       sPriv->extensions = dri_robust_screen_extensions;
       screen->has_reset_status_query = true;