Function demo_desktop_update

Examples/StereoKitCTest/demo_desktop.cpp:168–199

///////////////////////////////////////////

void demo_desktop_update() {
	// Update our desktop texture
	if (duplication_next_frame(duplication_api, duplication_tex)) {
		if (tex_get_width (desktop_tex) != tex_get_width (duplication_tex) ||
			tex_get_height(desktop_tex) != tex_get_height(duplication_tex)) {
			tex_set_colors(desktop_tex, tex_get_width(duplication_tex), tex_get_height(duplication_tex), nullptr);
			demo_mesh_create(desktop_tex, 1, desktop_mesh);
		}
		render_blit(desktop_tex, desktop_blit_mat);
	}

	// prepare a little grab handle underneath the desktop texture
	float    size   = tex_get_height(desktop_tex) * 0.0004f;
	bounds_t bounds = mesh_get_bounds(desktop_mesh);
	bounds.center     = (bounds.center + vec3{ 0, -bounds.dimensions.y / 2, bounds.dimensions.z / 2 }) * size + vec3{0,-0.02f,-0.02f};
	bounds.dimensions = vec3{0.2f, 0.02f, 0.02f};

	// UI for the grab handle
	static pose_t desktop_pose        = pose_t{ vec3{0,0,-0.5f}, quat_lookat(vec3_zero, {0,0,1}) };
	static pose_t desktop_pose_smooth = desktop_pose;
	ui_enable_far_interact(false);
	ui_handle_begin("Desktop", desktop_pose, bounds, true);
	ui_handle_end();
	ui_enable_far_interact(true);

	// Smooth out the motion extra for nicer placement
	desktop_pose_smooth = {
		vec3_lerp (desktop_pose_smooth.position,    desktop_pose.position,    4 * time_stepf()),
		quat_slerp(desktop_pose_smooth.orientation, desktop_pose.orientation, 4 * time_stepf()) };
	desktop_pose = desktop_pose_smooth;
	render_add_mesh(desktop_mesh, desktop_material, pose_matrix(desktop_pose, vec3_one * size));
}

///////////////////////////////////////////