render/vulkan: Implement texture_read_pixels

include/render/vulkan.h

@@ -374,6 +374,12 @@ bool vulkan_sync_render_buffer(struct wlr_vk_renderer *renderer,
 	struct wlr_vk_render_buffer *render_buffer, struct wlr_vk_command_buffer *cb);
 bool vulkan_sync_foreign_texture(struct wlr_vk_texture *texture);
 
+bool vulkan_read_pixels(struct wlr_vk_renderer *vk_renderer,
+	VkFormat src_format, VkImage src_image,
+	uint32_t drm_format, uint32_t stride,
+	uint32_t width, uint32_t height, uint32_t src_x, uint32_t src_y,
+	uint32_t dst_x, uint32_t dst_y, void *data);
+
 // State (e.g. image texture) associated with a surface.
 struct wlr_vk_texture {
 	struct wlr_texture wlr_texture;

render/vulkan/pixel_format.c

@@ -230,13 +230,14 @@ const struct wlr_vk_format *vulkan_get_format_from_drm(uint32_t drm_format) {
 }
 
 const VkImageUsageFlags vulkan_render_usage =
-	VK_IMAGE_USAGE_COLOR_ATTACHMENT_BIT |
+	VK_IMAGE_USAGE_COLOR_ATTACHMENT_BIT;
-	VK_IMAGE_USAGE_TRANSFER_SRC_BIT;
 const VkImageUsageFlags vulkan_shm_tex_usage =
 	VK_IMAGE_USAGE_SAMPLED_BIT |
-	VK_IMAGE_USAGE_TRANSFER_DST_BIT;
+	VK_IMAGE_USAGE_TRANSFER_DST_BIT |
+	VK_IMAGE_USAGE_TRANSFER_SRC_BIT;
 const VkImageUsageFlags vulkan_dma_tex_usage =
-	VK_IMAGE_USAGE_SAMPLED_BIT;
+	VK_IMAGE_USAGE_SAMPLED_BIT |
+	VK_IMAGE_USAGE_TRANSFER_SRC_BIT;
 
 static const VkFormatFeatureFlags render_features =
 	VK_FORMAT_FEATURE_COLOR_ATTACHMENT_BIT |

render/vulkan/renderer.c

@@ -1116,14 +1116,25 @@ static void vulkan_destroy(struct wlr_renderer *wlr_renderer) {
 	free(renderer);
 }
 
-static bool vulkan_read_pixels(struct wlr_renderer *wlr_renderer,
+static bool vulkan_read_pixels_legacy(struct wlr_renderer *wlr_renderer,
 		uint32_t drm_format, uint32_t stride,
 		uint32_t width, uint32_t height, uint32_t src_x, uint32_t src_y,
 		uint32_t dst_x, uint32_t dst_y, void *data) {
 	struct wlr_vk_renderer *vk_renderer = vulkan_get_renderer(wlr_renderer);
-	VkDevice dev = vk_renderer->dev->dev;
+	VkFormat src_format = vk_renderer->current_render_buffer->render_setup->render_format->vk;
 	VkImage src_image = vk_renderer->current_render_buffer->image;
 
+	return vulkan_read_pixels(vk_renderer, src_format, src_image, drm_format,
+		stride, width, height, src_x, src_y, dst_x, dst_y, data);
+}
+
+bool vulkan_read_pixels(struct wlr_vk_renderer *vk_renderer,
+		VkFormat src_format, VkImage src_image,
+		uint32_t drm_format, uint32_t stride,
+		uint32_t width, uint32_t height, uint32_t src_x, uint32_t src_y,
+		uint32_t dst_x, uint32_t dst_y, void *data) {
+	VkDevice dev = vk_renderer->dev->dev;
+
 	const struct wlr_pixel_format_info *pixel_format_info = drm_get_pixel_format_info(drm_format);
 	if (!pixel_format_info) {
 		wlr_log(WLR_ERROR, "vulkan_read_pixels: could not find pixel format info "
@@ -1141,7 +1152,6 @@ static bool vulkan_read_pixels(struct wlr_renderer *wlr_renderer,
 		return false;
 	}
 	VkFormat dst_format = wlr_vk_format->vk;
-	VkFormat src_format = vk_renderer->current_render_buffer->render_setup->render_format->vk;
 	VkFormatProperties dst_format_props = {0}, src_format_props = {0};
 	vkGetPhysicalDeviceFormatProperties(vk_renderer->dev->phdev, dst_format, &dst_format_props);
 	vkGetPhysicalDeviceFormatProperties(vk_renderer->dev->phdev, src_format, &src_format_props);
@@ -1387,7 +1397,7 @@ static const struct wlr_renderer_impl renderer_impl = {
 	.get_dmabuf_texture_formats = vulkan_get_dmabuf_texture_formats,
 	.get_render_formats = vulkan_get_render_formats,
 	.preferred_read_format = vulkan_preferred_read_format,
-	.read_pixels = vulkan_read_pixels,
+	.read_pixels = vulkan_read_pixels_legacy,
 	.destroy = vulkan_destroy,
 	.get_drm_fd = vulkan_get_drm_fd,
 	.get_render_buffer_caps = vulkan_get_render_buffer_caps,

render/vulkan/texture.c

@@ -249,8 +249,22 @@ static void vulkan_texture_unref(struct wlr_texture *wlr_texture) {
 	}
 }
 
+static bool vulkan_texture_read_pixels(struct wlr_texture *wlr_texture,
+		const struct wlr_texture_read_pixels_options *options) {
+	struct wlr_vk_texture *texture = vulkan_get_texture(wlr_texture);
+
+	struct wlr_box src;
+	wlr_texture_read_pixels_options_get_src_box(options, wlr_texture, &src);
+
+	void *p = wlr_texture_read_pixel_options_get_data(options);
+
+	return vulkan_read_pixels(texture->renderer, texture->format->vk, texture->image,
+		options->format, options->stride, src.width, src.height, src.x, src.y, 0, 0, p);
+}
+
 static const struct wlr_texture_impl texture_impl = {
 	.update_from_buffer = vulkan_texture_update_from_buffer,
+	.read_pixels = vulkan_texture_read_pixels,
 	.destroy = vulkan_texture_unref,
 };