add render timer API

Based on five calls:
wlr_render_timer_create - creates a timer which can be reused across
  frames on the same renderer
wlr_renderer_begin_buffer_pass - now takes a timer so that backends can
  record when the rendering starts and finishes
wlr_render_timer_get_time - should be called as late as possible so that
  queries can make their way back from the GPU
wlr_render_timer_destroy - self-explanatory

The timer is exposed as an opaque `struct wlr_render_timer` so that
backends can store whatever they want in there.

4 files changed, 28 insertions, 6 deletions

diff --git a/render/gles2/renderer.c b/render/gles2/renderer.c
index 414d5feb..c330d7ad 100644
--- a/render/gles2/renderer.c
+++ b/render/gles2/renderer.c
@@ -537,7 +537,7 @@ static void gles2_destroy(struct wlr_renderer *wlr_renderer) {
 }
 
 static struct wlr_render_pass *gles2_begin_buffer_pass(struct wlr_renderer *wlr_renderer,
-		struct wlr_buffer *wlr_buffer) {
+		struct wlr_buffer *wlr_buffer, struct wlr_buffer_pass_options *options) {
 	struct wlr_gles2_renderer *renderer = gles2_get_renderer(wlr_renderer);
 	if (!wlr_egl_make_current(renderer->egl)) {
 		return NULL;
diff --git a/render/pixman/renderer.c b/render/pixman/renderer.c
index 2ada4cdb..821bb9f5 100644
--- a/render/pixman/renderer.c
+++ b/render/pixman/renderer.c
@@ -494,7 +494,7 @@ static uint32_t pixman_get_render_buffer_caps(struct wlr_renderer *renderer) {
 }
 
 static struct wlr_render_pass *pixman_begin_buffer_pass(struct wlr_renderer *wlr_renderer,
-		struct wlr_buffer *wlr_buffer) {
+		struct wlr_buffer *wlr_buffer, struct wlr_buffer_pass_options *options) {
 	struct wlr_pixman_renderer *renderer = get_renderer(wlr_renderer);
 
 	struct wlr_pixman_buffer *buffer = get_buffer(renderer, wlr_buffer);
diff --git a/render/vulkan/renderer.c b/render/vulkan/renderer.c
index 4476f55b..70ec0ce0 100644
--- a/render/vulkan/renderer.c
+++ b/render/vulkan/renderer.c
@@ -1916,7 +1916,8 @@ static uint32_t vulkan_get_render_buffer_caps(struct wlr_renderer *wlr_renderer)
 	return WLR_BUFFER_CAP_DMABUF;
 }
 
-static struct wlr_render_pass *vulkan_begin_buffer_pass(struct wlr_renderer *wlr_renderer, struct wlr_buffer *buffer) {
+static struct wlr_render_pass *vulkan_begin_buffer_pass(struct wlr_renderer *wlr_renderer,
+		struct wlr_buffer *buffer, struct wlr_buffer_pass_options *options) {
 	struct wlr_vk_renderer *renderer = vulkan_get_renderer(wlr_renderer);
 
 	struct wlr_vk_render_buffer *render_buffer = get_render_buffer(renderer, buffer);
diff --git a/render/wlr_renderer.c b/render/wlr_renderer.c
index cfddca88..22c1f8d2 100644
--- a/render/wlr_renderer.c
+++ b/render/wlr_renderer.c
@@ -413,10 +413,31 @@ int wlr_renderer_get_drm_fd(struct wlr_renderer *r) {
 	return r->impl->get_drm_fd(r);
 }
 
-struct wlr_render_pass *wlr_renderer_begin_buffer_pass(
-		struct wlr_renderer *renderer, struct wlr_buffer *buffer) {
+struct wlr_render_pass *wlr_renderer_begin_buffer_pass(struct wlr_renderer *renderer,
+		struct wlr_buffer *buffer, struct wlr_buffer_pass_options *options) {
 	if (!renderer->impl->begin_buffer_pass) {
 		return begin_legacy_buffer_render_pass(renderer, buffer);
 	}
-	return renderer->impl->begin_buffer_pass(renderer, buffer);
+	return renderer->impl->begin_buffer_pass(renderer, buffer, options);
+}
+
+struct wlr_render_timer *wlr_render_timer_create(struct wlr_renderer *renderer) {
+	if (!renderer->impl->render_timer_create) {
+		return NULL;
+	}
+	return renderer->impl->render_timer_create(renderer);
+}
+
+int wlr_render_timer_get_duration_ns(struct wlr_render_timer *timer) {
+	if (!timer->impl->get_duration_ns) {
+		return -1;
+	}
+	return timer->impl->get_duration_ns(timer);
+}
+
+void wlr_render_timer_destroy(struct wlr_render_timer *timer) {
+	if (!timer->impl->destroy) {
+		return;
+	}
+	timer->impl->destroy(timer);
 }