render/vulkan: add some interfaces to allow compositors to integrate

Added wlr_vk_renderer_get_* functions to allow get the VkInstance,
VkPhysicalDevice, VkDevice, queue family of a wlr_vk_renderer.

Added wlr_vk_renderer_get_current_image_attribs function to allow get
the VkImage of current renderer buffer to use on compositors.

Added wlr_renderer_is_vk function, it's like the wlr_renderer_is_gles2,
returns true if the wlr_renderer is a wlr_vk_renderer.

Added wlr_vk_image_get_attribs function to get a VkImage and it's
extras information (e.g. a VkImageLayout and VkImageFormat of the
VkImage) from a wlr_texture.

include/wlr/render/vulkan.h

@@ -9,10 +9,29 @@
 #ifndef WLR_RENDER_VULKAN_H
 #define WLR_RENDER_VULKAN_H
 
+#include <vulkan/vulkan_core.h>
 #include <wlr/render/wlr_renderer.h>
 
+struct wlr_vk_image_attribs {
+	VkImage image;
+	VkImageLayout layout;
+	VkFormat format;
+};
+
 struct wlr_renderer *wlr_vk_renderer_create_with_drm_fd(int drm_fd);
+
+VkInstance wlr_vk_renderer_get_instance(struct wlr_renderer *renderer);
+VkPhysicalDevice wlr_vk_renderer_get_physical_device(struct wlr_renderer *renderer);
+VkDevice wlr_vk_renderer_get_device(struct wlr_renderer *renderer);
+uint32_t wlr_vk_renderer_get_queue_family(struct wlr_renderer *renderer);
+void wlr_vk_renderer_get_current_image_attribs(struct wlr_renderer *renderer,
+	struct wlr_vk_image_attribs *attribs);
+
+bool wlr_renderer_is_vk(struct wlr_renderer *wlr_renderer);
 bool wlr_texture_is_vk(struct wlr_texture *texture);
 
+void wlr_vk_texture_get_image_attribs(struct wlr_texture *texture,
+	struct wlr_vk_image_attribs *attribs);
+
 #endif
 

render/vulkan/renderer.c

@@ -42,8 +42,12 @@ static bool default_debug = true;
 
 static const struct wlr_renderer_impl renderer_impl;
 
+bool wlr_renderer_is_vk(struct wlr_renderer *wlr_renderer) {
+	return wlr_renderer->impl == &renderer_impl;
+}
+
 struct wlr_vk_renderer *vulkan_get_renderer(struct wlr_renderer *wlr_renderer) {
-	assert(wlr_renderer->impl == &renderer_impl);
+	assert(wlr_renderer_is_vk(wlr_renderer));
 	return (struct wlr_vk_renderer *)wlr_renderer;
 }
 
@@ -1817,3 +1821,35 @@ struct wlr_renderer *wlr_vk_renderer_create_with_drm_fd(int drm_fd) {
 
 	return vulkan_renderer_create_for_device(dev);
 }
+
+VkInstance wlr_vk_renderer_get_instance(struct wlr_renderer *renderer)
+{
+	struct wlr_vk_renderer *vk_renderer = vulkan_get_renderer(renderer);
+	return vk_renderer->dev->instance->instance;
+}
+
+VkPhysicalDevice wlr_vk_renderer_get_physical_device(struct wlr_renderer *renderer)
+{
+	struct wlr_vk_renderer *vk_renderer = vulkan_get_renderer(renderer);
+	return vk_renderer->dev->phdev;
+}
+
+VkDevice wlr_vk_renderer_get_device(struct wlr_renderer *renderer)
+{
+	struct wlr_vk_renderer *vk_renderer = vulkan_get_renderer(renderer);
+	return vk_renderer->dev->dev;
+}
+
+uint32_t wlr_vk_renderer_get_queue_family(struct wlr_renderer *renderer)
+{
+	struct wlr_vk_renderer *vk_renderer = vulkan_get_renderer(renderer);
+	return vk_renderer->dev->queue_family;
+}
+
+void wlr_vk_renderer_get_current_image_attribs(struct wlr_renderer *renderer,
+		struct wlr_vk_image_attribs *attribs) {
+	struct wlr_vk_renderer *vk_renderer = vulkan_get_renderer(renderer);
+	attribs->image = vk_renderer->current_render_buffer->image;
+	attribs->format = vk_renderer->current_render_buffer->render_setup->render_format;
+	attribs->layout = VK_IMAGE_LAYOUT_UNDEFINED;
+}

render/vulkan/texture.c

@@ -283,8 +283,6 @@ static struct wlr_texture *vulkan_texture_from_pixels(
 		.usage = VK_IMAGE_USAGE_SAMPLED_BIT | VK_IMAGE_USAGE_TRANSFER_DST_BIT,
 	};
 
-	VkImageLayout layout = VK_IMAGE_LAYOUT_SHADER_READ_ONLY_OPTIMAL;
-
 	res = vkCreateImage(dev, &img_info, NULL, &texture->image);
 	if (res != VK_SUCCESS) {
 		wlr_vk_error("vkCreateImage failed", res);
@@ -362,7 +360,7 @@ static struct wlr_texture *vulkan_texture_from_pixels(
 
 	VkDescriptorImageInfo ds_img_info = {
 		.imageView = texture->image_view,
-		.imageLayout = layout,
+		.imageLayout = VK_IMAGE_LAYOUT_SHADER_READ_ONLY_OPTIMAL,
 	};
 
 	VkWriteDescriptorSet ds_write = {
@@ -771,3 +769,12 @@ struct wlr_texture *vulkan_texture_from_buffer(struct wlr_renderer *wlr_renderer
 		return NULL;
 	}
 }
+
+void wlr_vk_texture_get_image_attribs(struct wlr_texture *texture,
+		struct wlr_vk_image_attribs *attribs) {
+	struct wlr_vk_texture *vk_texture = vulkan_get_texture(texture);
+	attribs->image = vk_texture->image;
+	attribs->format = vk_texture->format->vk_format;
+	attribs->layout = vk_texture->transitioned ?
+		VK_IMAGE_LAYOUT_SHADER_READ_ONLY_OPTIMAL : VK_IMAGE_LAYOUT_UNDEFINED;
+}