Load instead of Clear in ImGui pass

Author: karnkaul

src/app.cpp

@@ -244,6 +244,9 @@ void App::render(vk::CommandBuffer const command_buffer) {
 	command_buffer.endRendering();
 
 	m_imgui->end_frame();
+	// we don't want to clear the image again, instead load it intact after the
+	// previous pass.
+	color_attachment.setLoadOp(vk::AttachmentLoadOp::eLoad);
 	rendering_info.setColorAttachments(color_attachment)
 		.setPDepthAttachment(nullptr);
 	command_buffer.beginRendering(rendering_info);