rpbegin.framebuffer = vk_fb(fb[imgid]);
vk_rect(&rpbegin.renderArea, 0, 0, win_width, win_height);
rpbegin.pClearValues = clear;
rpbegin.framebuffer = vk_fb(fb[imgid]);
vk_rect(&rpbegin.renderArea, 0, 0, win_width, win_height);
rpbegin.pClearValues = clear;