Function on_begin_render_effects

examples/09-depth/generic_depth_addon.cpp:932–1128

}

static void on_begin_render_effects(effect_runtime *runtime, command_list *cmd_list, resource_view, resource_view)
{
	device *const device = runtime->get_device();
	generic_depth_device_data *const device_data = device->get_private_data<generic_depth_device_data>();

	if (device_data == nullptr)
		return;

	auto &data = *runtime->get_private_data<generic_depth_data>();

	resource selected_depth_stencil = { 0 };
	const depth_stencil_resource *selected_depth_stencil_info = nullptr;

	uint32_t frame_width, frame_height;
	runtime->get_screenshot_width_and_height(&frame_width, &frame_height);

	std::shared_lock<std::shared_mutex> lock(s_mutex);
	const std::unordered_map<resource, depth_stencil_resource, resource_hash> current_depth_stencil_resources = device_data->depth_stencil_resources;
	// Unlock before calling into device below, since device may hold a lock itself and that then can deadlock another thread that calls into 'on_destroy_resource' from the device holding that lock
	lock.unlock();

	for (auto &[depth_stencil, info] : current_depth_stencil_resources)
	{
		if (info.last_frame_stats.total.drawcalls == 0 || (info.last_frame_stats.total.vertices <= 3 && info.last_frame_stats.total.drawcalls_indirect == 0))
			continue; // Skip unused

		if (info.last_used_in_frame < device_data->frame_index || device_data->frame_index <= (info.first_used_in_frame + 1))
			continue; // Skip resources not used this frame or those that only just appeared for the first time

		if (info.desc.texture.samples > 1 && !device->check_capability(device_caps::resolve_depth_stencil))
			continue; // Ignore multisampled textures, since they would need to be resolved first

		if (s_format_filtering != 0 && !check_depth_format(info.desc.texture.format))
			continue;
		if (s_aspect_ratio_heuristic != aspect_ratio_heuristic::none && !check_aspect_ratio(static_cast<float>(info.desc.texture.width), static_cast<float>(info.desc.texture.height), static_cast<float>(frame_width), static_cast<float>(frame_height)))
			continue; // Not a good fit

		if (selected_depth_stencil.handle == 0 ||
			info.last_frame_stats.total > selected_depth_stencil_info->last_frame_stats.total)
		{
			selected_depth_stencil = depth_stencil;
			selected_depth_stencil_info = &info;
		}
	}

	if (data.override_depth_stencil != 0)
	{
		const auto it = current_depth_stencil_resources.find(data.override_depth_stencil);
		if (it != current_depth_stencil_resources.end())
		{
			selected_depth_stencil = it->first;
			selected_depth_stencil_info = &it->second;
		}
	}

	const resource_view prev_shader_resource = data.selected_shader_resource;

	if (selected_depth_stencil != 0) do