From 5ba751a2392edbdffb04e49e4939a286eae6d300 Mon Sep 17 00:00:00 2001
From: Lubosz Sarnecki <lubosz.sarnecki@collabora.com>
Date: Thu, 16 Apr 2020 17:56:59 +0200
Subject: [PATCH] c/renderer: Expose idle image control.

---
 src/xrt/compositor/main/comp_renderer.c | 27 +++++++++++++++++++++----
 src/xrt/compositor/main/comp_renderer.h | 15 ++++++++++++++
 2 files changed, 38 insertions(+), 4 deletions(-)

diff --git a/src/xrt/compositor/main/comp_renderer.c b/src/xrt/compositor/main/comp_renderer.c
index 1ee67739e..f7fc707d5 100644
--- a/src/xrt/compositor/main/comp_renderer.c
+++ b/src/xrt/compositor/main/comp_renderer.c
@@ -167,6 +167,12 @@ comp_renderer_frame(struct comp_renderer *r,
 	renderer_render(r);
 }
 
+void
+comp_renderer_frame_cached(struct comp_renderer *r)
+{
+	renderer_render(r);
+}
+
 void
 comp_renderer_destroy(struct comp_renderer *r)
 {
@@ -606,6 +612,15 @@ _create_fences(struct comp_renderer *r)
 	}
 }
 
+static void
+_set_dummy_images(struct comp_renderer *r)
+{
+	for (uint32_t i = 0; i < 2; i++)
+		comp_distortion_update_descriptor_set(
+		    r->distortion, r->dummy_images[i].sampler,
+		    r->dummy_images[i].views[0], i);
+}
+
 static void
 renderer_init(struct comp_renderer *r)
 {
@@ -636,14 +651,18 @@ renderer_init(struct comp_renderer *r)
 	                     r->c->xdev->hmd, r->descriptor_pool,
 	                     r->settings->flip_y);
 
-	for (uint32_t i = 0; i < 2; i++)
-		comp_distortion_update_descriptor_set(
-		    r->distortion, r->dummy_images[i].sampler,
-		    r->dummy_images[i].views[0], i);
+	_set_dummy_images(r);
 
 	renderer_build_command_buffers(r);
 }
 
+void
+comp_renderer_set_idle_images(struct comp_renderer *r)
+{
+	_set_dummy_images(r);
+	renderer_rebuild_command_buffers(r);
+}
+
 static void
 renderer_set_swapchain_image(struct comp_renderer *r,
                              uint32_t eye,
diff --git a/src/xrt/compositor/main/comp_renderer.h b/src/xrt/compositor/main/comp_renderer.h
index d9c2210bd..17b806335 100644
--- a/src/xrt/compositor/main/comp_renderer.h
+++ b/src/xrt/compositor/main/comp_renderer.h
@@ -58,6 +58,21 @@ comp_renderer_reset(struct comp_renderer *r);
 void
 comp_renderer_destroy(struct comp_renderer *r);
 
+/*!
+ * Set dummy images in renderer.
+ *
+ * @ingroup comp_main
+ */
+void
+comp_renderer_set_idle_images(struct comp_renderer *r);
+
+/*!
+ * Render frame without setting new images.
+ *
+ * @ingroup comp_main
+ */
+void
+comp_renderer_frame_cached(struct comp_renderer *r);
 
 #ifdef __cplusplus
 }