var prosperon = {}

// This file is hard coded for the SDL GPU case

var video = use('sdl_video')
var surface = use('surface')
var sdl_gpu = use('sdl_gpu')
var io = use('io')
var geometry = use('geometry')
var blob = use('blob')
var imgui = use('imgui')

var os = use('os')

var win_size = {width:500,height:500}

function makeOrthoMetal(l,r,b,t,n,f){
  return [
    2/(r-l),      0,           0, 0,
         0, 2/(t-b),           0, 0,
         0,       0, 1/(f-n),  0,
  -(r+l)/(r-l), -(t+b)/(t-b), -n/(f-n), 1
  ]
}

function make_camera_pblob(camera) {
  def cw = camera.surface ? camera.surface.width  : win_size.width;
  def ch = camera.surface ? camera.surface.height : win_size.height;
  
  var world_w, world_h;
  
  if (camera.width && camera.aspect_ratio) {
    // Use direct world dimensions if specified
    world_w = camera.width;
    world_h = camera.width / camera.aspect_ratio;
  } else {
    // Fallback to zoom-based calculation
    def zoom = camera.zoom || ch;
    world_h = zoom;
    world_w = zoom * cw / ch;
  }

  def l = camera.pos[0] - camera.anchor[0] * world_w;
  def b = camera.pos[1] - camera.anchor[1] * world_h;
  def r = l + world_w;
  def t = b + world_h;

  def mat = makeOrthoMetal(l, r, b, t, 0, 1);
  return geometry.array_blob(mat);
}

var driver = "vulkan"
switch(os.platform()) {
  case "Linux":
    driver = "vulkan"
    break
  case "Windows":
//    driver = "direct3d12"
    driver = "vulkan"
    break
  case "macOS":
    driver = "metal"
    break
}

var default_sampler = {
  min_filter: "linear",
  mag_filter: "linear",
  mipmap: "nearest",
  u: "repeat",
  v: "repeat",
  w: "repeat",
  mip_bias: 0,
  max_anisotropy: 0,
  compare_op: "none",
  min_lod: 0,
  max_lod: 10,
  anisotropy: false,
  compare: false
};

var main_color = {
  type:"2d",
  format: "rgba8",
  layers: 1,
  mip_levels: 1,
  samples: 0,
  sampler:true,
  color_target:true
};

var main_depth = {
  type: "2d",
  format: "d32 float s8",
  layers:1,
  mip_levels:1,
  samples:0,
  sampler:true,
  depth_target:true
};

var default_window = {
  // Basic properties
  title: "Prosperon Window",
  width: 640,
  height: 360,
  
  // Position - can be numbers or "centered"
  x: null,  // SDL_WINDOWPOS_null by default
  y: null,  // SDL_WINDOWPOS_null by default
  
  // Window behavior flags
  resizable: true,
  fullscreen: false,
  hidden: false,
  borderless: false,
  alwaysOnTop: false,
  minimized: false,
  maximized: false,
  
  // Input grabbing
  mouseGrabbed: false,
  keyboardGrabbed: false,
  
  // Display properties
  highPixelDensity: false,
  transparent: false,
  opacity: 1.0,  // 0.0 to 1.0
  
  // Focus behavior
  notFocusable: false,
  
  // Special window types (mutually exclusive)
  utility: false,      // Utility window (not in taskbar)
  tooltip: false,      // Tooltip window (requires parent)
  popupMenu: false,    // Popup menu window (requires parent)
  
  // Graphics API flags (var SDL choose if not specified)
  opengl: false,       // Force OpenGL context
  vulkan: false,       // Force Vulkan context
  metal: false,        // Force Metal context (macOS)
  
  // Advanced properties
  parent: null,   // Parent window for tooltips/popups/modal
  modal: false,        // Modal to parent window (requires parent)
  externalGraphicsContext: false,  // Use external graphics context
  
  // Input handling
  textInput: true,     // Enable text input on creation
}

var win_config = arg[0] || {}
win_config.__proto__ = default_window

win_config.metal = true

var window = new video.window(win_config)
prosperon.window = window
var win_proto = window.__proto__
win_proto.toJSON = function()
{
  var flags = this.flags
  var ret = {
    title: this.title,
    size: this.size,
    pixel_size: this.sizeInPixels,
    display_scale: this.displayScale,
    pixel_density: this.pixelDensity,
    pos: this.position,
    opacity: this.opacity,
    fullscreen: this.fullscreen,
    safe_area: this.safe_area(),
  }
  
  for (var i in flags)
    ret[i] = flags[i]
  return ret
}

window.resizable = true

var device = new sdl_gpu.gpu({
  shaders_msl:true,
  shaders_metallib:true,
  name: "metal"
})
device.claim_window(window)
device.set_swapchain(window, 'sdr', 'vsync')

var white_pixel = {
  width:1,
  height:1,
  pixels: new blob(32, true), // 32 bits, all set to 1 for a white blob
  pitch:32
}

stone(white_pixel.pixels)

var shader_type = device.shader_format()[0]
shader_type = 'msl'

var sampler_cache = {}

function canonicalize_sampler(desc) {
  return json.encode(desc)
}

function get_sampler(desc) {
  var key = canonicalize_sampler(desc)
  
  if (!sampler_cache[key]) {

    var sampler_config = json.decode(key)
    sampler_cache[key] = new sdl_gpu.sampler(device, sampler_config)
  }
  
  return sampler_cache[key]
}

var std_sampler = get_sampler(true)

// Shader and pipeline cache
var shader_cache = {}
var pipeline_cache = {}

function upload(copypass, buffer, toblob)
{
  stone(toblob)
  var trans = new sdl_gpu.transfer_buffer(device, {
    size: toblob.length/8,
    usage:"upload"
  })

  trans.copy_blob(device, toblob)
  
  copypass.upload_to_buffer({
    transfer_buffer: trans,
    offset:0
  }, {
    buffer: buffer,
    offset: 0,
    size: toblob.length/8
  })
}

function make_shader(sh_file)
{
  var file = `shaders/${shader_type}/${sh_file}.${shader_type}`
  if (shader_cache[file]) return shader_cache[file]
  var refl = json.decode(io.slurp(`shaders/reflection/${sh_file}.json`))
  
  var shader = {
    code: io.slurpbytes(file),
    format: shader_type,
    stage: sh_file.endsWith("vert") ? "vertex" : "fragment",
    num_samplers: refl.separate_samplers ? refl.separate_samplers.length : 0,
    num_textures: 0,
    num_storage_buffers: refl.separate_storage_buffers ? refl.separate_storage_buffers.length : 0,
    num_uniform_buffers: refl.ubos ? refl.ubos.length : 0,
    entrypoint: shader_type == "msl" ? "main0" : "main"
  }
  
  shader[GPU] = new sdl_gpu.shader(device, shader)
  shader.reflection = refl;
  shader_cache[file] = shader
  shader.file = sh_file
  return shader
}

def material_pipeline_cache = {};

function get_pipeline_for_material(mat = {}) {
  def key = json.encode({
    vert: mat.vertex    || sprite_pipeline.vertex,
    frag: mat.fragment  || sprite_pipeline.fragment,
    blend: mat.blend    || sprite_pipeline.blend,
    cull: mat.cull      || sprite_pipeline.cull,
  });

  if (!material_pipeline_cache[key]) {
    def cfg = Object.assign({}, sprite_pipeline, {
      vertex:   mat.vertex   || sprite_pipeline.vertex,
      fragment: mat.fragment || sprite_pipeline.fragment,
      blend:    mat.blend    || sprite_pipeline.blend,
      cull:     mat.cull     || sprite_pipeline.cull,
    });

    cfg.__proto__ = sprite_pipeline
    material_pipeline_cache[key] = load_pipeline(cfg)
  }
  
  return material_pipeline_cache[key];
}

function load_pipeline(config)
{
  // pull back the JS shader objects (they have `.reflection`)
  def vertShader = make_shader(config.vertex);
  def fragShader = make_shader(config.fragment);

  // build the GPU pipeline
  def gpuPipeline = new sdl_gpu.graphics_pipeline(device, {
    vertex: vertShader[GPU],
    fragment: fragShader[GPU],
    // ...all the other config fields...
    primitive: config.primitive,
    blend: config.blend,
    cull: config.cull,
    face: config.face,
    depth: config.depth,
    stencil: config.stencil,
    alpha_to_coverage: config.alpha_to_coverage,
    multisample: config.multisample,
    label: config.label,
    target: config.target,
    vertex_buffer_descriptions: config.vertex_buffer_descriptions,
    vertex_attributes: config.vertex_attributes
  });

  // stash the reflection in the JS wrapper for easy access later
  gpuPipeline._reflection = {
    vertex: vertShader.reflection,
    fragment: fragShader.reflection
  };

  return gpuPipeline;
}

// Helper function to pack JavaScript objects into binary blob for UBOs
function pack_ubo(obj, ubo_type, reflection) {
  var type_def = reflection.types[ubo_type];
  if (!type_def) {
    log.console(`Warning: No type definition found for ${ubo_type}`);
    return geometry.array_blob([]);
  }
  
  var result_blob = new blob();
  
  // Process each member in the UBO structure
  for (var member of type_def.members) {
    var value = obj[member.name];
    
    if (value == null) {
      if (member.type == "vec4") {
        result_blob.write_blob(geometry.array_blob([1, 1, 1, 1]));
      } else if (member.type == "vec3") {
        result_blob.write_blob(geometry.array_blob([1, 1, 1]));
      } else if (member.type == "vec2") {
        result_blob.write_blob(geometry.array_blob([1, 1]));
      } else if (member.type == "float") {
        result_blob.write_blob(geometry.array_blob([1]));
      }
      continue;
    }
    
    // Convert value to appropriate format based on type
    if (member.type == "vec4") {
      if (Array.isArray(value)) {
        result_blob.write_blob(geometry.array_blob(value));
      } else if (typeof value == "object" && value.r != null) {
        // Color object
        result_blob.write_blob(geometry.array_blob([value.r, value.g, value.b, value.a || 1]));
      } else {
        // Single value, expand to vec4
        result_blob.write_blob(geometry.array_blob([value, value, value, value]));
      }
    } else if (member.type == "vec3") {
      if (Array.isArray(value)) {
        result_blob.write_blob(geometry.array_blob(value));
      } else if (typeof value == 'object' && value.r != null)
        result_blob.write_blob(geometry.array_blob([value.r, value.g, value.b]));
      else
        result_blob.write_blob(geometry.array_blob([value, value, value]));
    } else if (member.type == "vec2") {
      if (Array.isArray(value)) {
        result_blob.write_blob(geometry.array_blob(value));
      } else {
        result_blob.write_blob(geometry.array_blob([value, value]));
      }
    } else if (member.type == "float") {
      result_blob.write_blob(geometry.array_blob([value]));
    }
  }
  
  return stone(result_blob)
}

var imgui = use('imgui')
imgui.init(window, device)

var io = use('io');
var rasterize = use('rasterize');
var time = use('time')
var tilemap = use('tilemap')

var res = use('resources')
var input = use('input')

var graphics = use('graphics')

var camera = {}

// Pipeline component definitions
var default_depth_state = {
  compare: "always",  // never/less/equal/less_equal/greater/not_equal/greater_equal/always
  test: false,
  write: false,
  bias: 0,
  bias_slope_scale: 0,
  bias_clamp: 0
}

var default_stencil_state = {
  compare: "always", // never/less/equal/less_equal/greater/neq/greq/always
  fail: "keep", // keep/zero/replace/incr_clamp/decr_clamp/invert/incr_wrap/decr_wrap
  depth_fail: "keep",
  pass: "keep"
}

var disabled_blend_state = {
  enabled: false,
  src_rgb: "zero",
  dst_rgb: "zero",
  op_rgb: "add",
  src_alpha: "one",
  dst_alpha: "zero",
  op_alpha: "add"
}

var alpha_blend_state = {
  enabled: true,
  src_rgb: "src_alpha",
  dst_rgb: "one_minus_src_alpha",
  op_rgb: "add",
  src_alpha: "one",
  dst_alpha: "one_minus_src_alpha",
  op_alpha: "add"
}

var default_multisample_state = {
  count: 1,
  mask: 0xFFFFFFFF,
  domask: false
}

// Helper function to create pipeline config
function create_pipeline_config(options) {
  var config = {
    vertex: options.vertex,
    fragment: options.fragment,
    primitive: options.primitive || "triangle",
    fill: options.fill ?? true,
    depth: options.depth || default_depth_state,
    stencil: {
      enabled: options.stencil_enabled ?? false,
      front: options.stencil_front || default_stencil_state,
      back: options.stencil_back || default_stencil_state,
      test: options.stencil_test ?? false,
      compare_mask: options.stencil_compare_mask ?? 0,
      write_mask: options.stencil_write_mask ?? 0
    },
    blend: options.blend || disabled_blend_state,
    cull: options.cull || "none",
    face: options.face || "cw",
    alpha_to_coverage: options.alpha_to_coverage ?? false,
    multisample: options.multisample || default_multisample_state,
    label: options.label || "pipeline",
    target: options.target || {}
  }
  
  // Ensure target has required properties
  if (!config.target.color_targets) {
    config.target.color_targets = [{
      format: "rgba8",
      blend: config.blend
    }]
  }
  
  return config
}

var gameactor

var images = {}

var renderer_commands = []

///// input /////
var input_cb
var input_rate = 1/60
function poll_input() {
  var evs = input.get_events()
  
  // Filter and transform events
  if (Array.isArray(evs)) {
    var filteredEvents = []
//    var wantMouse = imgui.wantmouse()
//    var wantKeys = imgui.wantkeys()
    var wantMouse = false
    var wantKeys = false
    
    for (var i = 0; i < evs.length; i++) {
      var event = evs[i]
      var shouldInclude = true
      
      // Filter mouse events if ImGui wants mouse input
      if (wantMouse && (event.type == 'mouse_motion' || 
                        event.type == 'mouse_button_down' || 
                        event.type == 'mouse_button_up' ||
                        event.type == 'mouse_wheel')) {
        shouldInclude = false
      }
      
      // Filter keyboard events if ImGui wants keyboard input
      if (wantKeys && (event.type == 'key_down' || 
                       event.type == 'key_up' ||
                       event.type == 'text_input' ||
                       event.type == 'text_editing')) {
        shouldInclude = false
      }
      
      if (shouldInclude) {
        if (event.type == 'window_pixel_size_changed') {
          win_size.width = event.width
          win_size.height = event.height
        }
        
        if (event.type == 'quit')
          $_.stop()
        
        if (event.type.includes('key')) {
          if (event.key)
            event.key = input.keyname(event.key)
        }
        
        if (event.type.startsWith('mouse_') && event.pos && event.pos.y) {
          event.pos.y = -event.pos.y + win_size.height
          event.pos.y /= win_size.height
          event.pos.x /= win_size.width
        }
        
        filteredEvents.push(event)
      }
    }
    
    evs = filteredEvents
  }
  
  input_cb(evs)
  $_.delay(poll_input, input_rate)
}

prosperon.input = function(fn)
{
  input_cb = fn
  poll_input()
}

var sprite_pipeline = {
  vertex: "sprite.vert",
  fragment: "sprite.frag",
  cull: "none",
  target: {
    color_targets: [
      {format: device.swapchain_format(window), blend:alpha_blend_state}
    ],
  },
  vertex_buffer_descriptions: [ { slot:0, input_rate: "vertex", instance_step_rate: 0,
    pitch: 8},
    {slot:1, input_rate:"vertex", instance_step_rate: 0, pitch: 8},
    {slot:2, input_rate:"vertex", instance_step_rate: 0, pitch: 16}
  ],
  vertex_attributes: [
    { location: 0, buffer_slot: 0, format: "float2", offset: 0},
    { location: 1, buffer_slot: 1, format: "float2", offset: 0},
    { location: 2, buffer_slot: 2, format: "float4", offset: 0}
  ],
  primitive: "triangle",
  blend: alpha_blend_state
}

var GPU = Symbol()

var cur_cam
var cmd_fns = {}
cmd_fns.scissor = function(cmd)
{
  draw_queue.push(cmd)
}

cmd_fns.camera = function(cmd)
{
  if (cmd.camera.surface && !cmd.camera.surface[GPU]) {
    cmd.camera.surface[GPU] = new sdl_gpu.texture(device, cmd.camera.surface)
    // Don't store sampler on texture - samplers belong to materials
  }
  draw_queue.push(cmd)
}

var new_tex = []

function get_img_gpu(surface)
{
  if (!surface) return

  var full_mip = Math.floor(Math.log2(Math.max(surface.width,surface.height))) + 1
  var gpu = new sdl_gpu.texture(device, {
    width: surface.width,
    height: surface.height,
    layers: 1,
    mip_levels: full_mip,
    samples: 0,
    type: "2d",
    format: "rgba8",
    sampler: surface.sampler != null ? surface.sampler : default_sampler,
    color_target: true
  })
  
  var tbuf = new sdl_gpu.transfer_buffer(device, {
    size: surface.pixels.length/8,
    usage: "upload"
  })

  tbuf.copy_blob(device, surface.pixels)
  
  copy_pass.upload_to_texture({
    transfer_buffer: tbuf,
    offset: 0,
    pixels_per_row: surface.width,
    rows_per_layer: surface.height,
  }, {
    texture: gpu,
    mip_level: 0,
    layer: 0,
    x: 0, y: 0, z: 0,
    w: surface.width,
    h: surface.height,
    d: 1
  }, false);
  
  if (full_mip > 1)
    new_tex.push(gpu)
  
  return gpu
}

var pos_blob
var uv_blob
var color_blob
var index_blob

var draw_queue = []
var index_count = 0
var vertex_count = 0

function render_geom(geom, img, pipeline = get_pipeline_for_material(null), material = null)
{
  if (!img[GPU]) {
    if (img.surface)
      img[GPU] = get_img_gpu(img.surface)
    else 
      img[GPU] = get_img_gpu(img.cpu)
      
    if (!img[GPU]) return
  }
  
  pos_blob.write_blob(geom.xy)
  uv_blob.write_blob(geom.uv)
  color_blob.write_blob(geom.color)
  index_blob.write_blob(geom.indices)
  
  draw_queue.push({
    pipeline,
    texture: img[GPU],
    material: material,
    num_indices: geom.num_indices,
    first_index: index_count,
    vertex_offset: vertex_count
  })
  
  vertex_count += (geom.xy.length/8) / 8
  index_count += geom.num_indices
}

cmd_fns.draw_image = function(cmd)
{
  var img
  if (typeof cmd.image == 'string')
    img = graphics.texture(cmd.image)
  else
    img = cmd.image
    
  if (cmd.rect.width && !cmd.rect.height)
    cmd.rect.height = cmd.rect.width * img.height / img.width
  else if (cmd.rect.height && !cmd.rect.width)
    cmd.rect.width = cmd.rect.height * img.width / img.height
  else if (!cmd.rect.height && !cmd.rect.width) {
    cmd.rect.width = img.width
    cmd.rect.height = img.height
  }
    
  var geom = geometry.make_rect_quad(cmd.rect)
  geom.indices = geometry.make_quad_indices(1)
  geom.num_indices = 6
  
  // Ensure material has diffuse property for dynamic binding
  if (!cmd.material) cmd.material = {}
  if (!cmd.material.diffuse) cmd.material.diffuse = img
  
  var pipeline = get_pipeline_for_material(cmd.material)
  render_geom(geom, img, pipeline, cmd.material)
}

cmd_fns.draw_text = function(cmd)
{
  if (!cmd.text || !cmd.pos) return
  
  var font = graphics.get_font(cmd.font)
  if (!font[GPU])
    font[GPU] = get_img_gpu(font.surface)

  var size = font.text_size(cmd.text, cmd.wrap, cmd.config.break, cmd.config.align)
  cmd.pos.width ??= size[0]
  cmd.pos.height ??= size[1]

  var mesh = font.make_text_buffer(
    cmd.text,
    cmd.pos,
    [cmd.material.color.r, cmd.material.color.g, cmd.material.color.b, cmd.material.color.a],
    cmd.wrap || 0,
    cmd.config.break,
    cmd.config.align
  )
  
  // Ensure material has diffuse property for dynamic binding
  if (!cmd.material) cmd.material = {}
  if (!cmd.material.diffuse) cmd.material.diffuse = font
  
  var pipeline = get_pipeline_for_material(cmd.material)
  render_geom(mesh, font, pipeline, cmd.material)
}

cmd_fns.tilemap = function(cmd)
{
  var geometryCommands = cmd.tilemap.draw()
  
  for (var geomCmd of geometryCommands) {
    var img = graphics.texture(geomCmd.image)
    if (!img) continue
    
    // Create a new material for each tile image with diffuse property
    var tileMaterial = Object.assign({}, cmd.material || {})
    tileMaterial.diffuse = img
    
    var pipeline = get_pipeline_for_material(tileMaterial)
    render_geom(geomCmd.geometry, img, pipeline, tileMaterial)
  }
}

cmd_fns.geometry = function(cmd)
{
  var img
  if (typeof cmd.image == 'object') {
    img = cmd.image
  } else {
    img = graphics.texture(cmd.image)
    if (!img) return
  }
  
  // Ensure material has diffuse property for dynamic binding
  if (!cmd.material) cmd.material = {}
  if (!cmd.material.diffuse) cmd.material.diffuse = img
  
  var pipeline = get_pipeline_for_material(cmd.material)
  render_geom(cmd.geometry, img, pipeline, cmd.material)
}

cmd_fns.draw_slice9 = function(cmd)
{
  var img = graphics.texture(cmd.image)
  if (!img) return
  
  var slice_info = {
    tile_top: true,
    tile_bottom: true,
    tile_left: true,
    tile_right: true,
    tile_center_x: true,
    tile_center_y: true
  }
  
  // Convert single slice value to LRTB object if needed
  var slice_lrtb = cmd.slice
  if (typeof cmd.slice == 'number') {
    var slice_val = cmd.slice
    if (slice_val > 0 && slice_val < 1) {
      slice_lrtb = {
        l: slice_val * img.width,
        r: slice_val * img.width,
        t: slice_val * img.height,
        b: slice_val * img.height
      }
    } else {
      slice_lrtb = {
        l: slice_val,
        r: slice_val,
        t: slice_val,
        b: slice_val
      }
    }
  } else {
    // Handle percentage values for each side individually
    slice_lrtb = {
      l: (cmd.slice.l > 0 && cmd.slice.l < 1) ? cmd.slice.l * img.width : cmd.slice.l,
      r: (cmd.slice.r > 0 && cmd.slice.r < 1) ? cmd.slice.r * img.width : cmd.slice.r,
      t: (cmd.slice.t > 0 && cmd.slice.t < 1) ? cmd.slice.t * img.height : cmd.slice.t,
      b: (cmd.slice.b > 0 && cmd.slice.b < 1) ? cmd.slice.b * img.height : cmd.slice.b
    }
  }
  
  var mesh = geometry.slice9(img, cmd.rect, slice_lrtb, slice_info)
  
  // Ensure material has diffuse property for dynamic binding
  if (!cmd.material) cmd.material = {}
  if (!cmd.material.diffuse) cmd.material.diffuse = img
  
  var pipeline = get_pipeline_for_material(cmd.material)
  render_geom(mesh, img, pipeline, cmd.material)
}

cmd_fns.draw_rect = function(cmd)
{
  // Create geometry for a rectangle quad
  var geom = geometry.make_rect_quad(cmd.rect, null, cmd.material.color)
  geom.indices = geometry.make_quad_indices(1)
  geom.num_indices = 6
  
  // Use white_pixel as the texture so the color modulation works
  if (!white_pixel[GPU])
    white_pixel[GPU] = get_img_gpu(white_pixel)
  
  var pipeline = get_pipeline_for_material(cmd.material)
  render_geom(geom, {[GPU]: white_pixel[GPU]}, pipeline, cmd.material)
}

var copy_pass

prosperon.create_batch = function create_batch(draw_cmds, done) {
  pos_blob = new blob
  uv_blob = new blob
  color_blob = new blob
  index_blob = new blob
  draw_queue = []
  index_count = 0
  vertex_count = 0
  new_tex = []
  
  var render_queue = device.acquire_cmd_buffer()
  copy_pass = render_queue.copy_pass()
  
  for (var cmd of draw_cmds)
    if (cmd_fns[cmd.cmd])
      cmd_fns[cmd.cmd](cmd)
      
  var pos_buffer   = new sdl_gpu.buffer(device,{ vertex:true, size:pos_blob.length/8});
  var uv_buffer    = new sdl_gpu.buffer(device,{ vertex:true, size:uv_blob.length/8});
  var color_buffer = new sdl_gpu.buffer(device,{ vertex:true, size:color_blob.length/8});
  var index_buffer = new sdl_gpu.buffer(device,{ index:true,  size:index_blob.length/8});

  upload(copy_pass, pos_buffer, pos_blob)
  upload(copy_pass, uv_buffer, uv_blob)
  upload(copy_pass, color_buffer, color_blob)
  upload(copy_pass, index_buffer, index_blob)
  
  copy_pass.end();

  imgui.prepare(render_queue)
  
  for (var g of new_tex)
    render_queue.generate_mipmaps(g)
    
  var render_pass
  var render_target
  
  // State tracking for optimization
  var current_pipeline = null
  var current_camera_blob = null
  var buffers_bound = false
  
  for (var cmd of draw_queue) {
    if (cmd.cmd == "scissor") {
      if (!cmd.rect)
        render_pass.scissor({x:0,y:0,width:win_size.width,height:win_size.height})
      else {
        render_pass.scissor(cmd.rect)
        log.console(json.encode(cmd.rect))
      }
      continue
    }
    if (cmd.camera) {
      if (!cmd.camera.surface && render_target != "swap") {
        if (render_pass)
          render_pass.end()
        render_target = "swap"
        render_pass = render_queue.swapchain_pass(window)
        // Reset state tracking when render pass changes
        current_pipeline = null
        buffers_bound = false
      } else if (cmd.camera.surface && render_target != cmd.camera.surface) {
        if (render_pass)
          render_pass.end()
        render_target = cmd.camera.surface
        render_pass = render_queue.render_pass({
          color_targets: [{
            texture: cmd.camera.surface[GPU],
            mip_level: 0,
            layer: 0,
            load: "clear",
            clear_color: cmd.camera.background,
            store: "store",
          }]
        })
        // Reset state tracking when render pass changes
        current_pipeline = null
        buffers_bound = false
      }
      
      var vpW, vpH
      
      if (render_target == "swap") {
        vpW = win_size.width
        vpH = win_size.height
      } else {
        vpW = render_target.width
        vpH = render_target.height
      }
      
      render_pass.viewport({
        x: cmd.camera.viewport.x*vpW,
        y: cmd.camera.viewport.y * vpH,
        width: cmd.camera.viewport.width * vpW,
        height: cmd.camera.viewport.height * vpH
      })

      var new_cam_blob = make_camera_pblob(cmd.camera)
      // Only update camera uniform if it changed
      if (current_camera_blob != new_cam_blob) {
        render_queue.push_vertex_uniform_data(0, new_cam_blob)
        current_camera_blob = new_cam_blob
      }
      continue
    }
    
    // Only bind pipeline if it changed
    if (current_pipeline != cmd.pipeline) {
      render_pass.bind_pipeline(cmd.pipeline)
      current_pipeline = cmd.pipeline
      // When pipeline changes, we need to rebind buffers and uniforms
      buffers_bound = false
      current_camera_blob = null
    }
    
    // Dynamic material binding - bind uniforms and textures from material
    if (cmd.material && cmd.pipeline._reflection) {
      def refl = cmd.pipeline._reflection;
      
      // Bind UBOs (uniform buffer objects)
      if (refl.fragment && refl.fragment.ubos) {
        for (def ubo of refl.fragment.ubos) {
          def name = ubo.name;
          def ubo_type = ubo.type;
          
          // For PSConstants or other UBOs, pack the material properties according to the UBO structure
          def packed_blob = pack_ubo(cmd.material, ubo_type, refl.fragment);
          
          if (packed_blob && packed_blob.length > 0) {
            // Push uniform data to both vertex and fragment stages
//            render_queue.push_vertex_uniform_data(ubo.binding, packed_blob);
            render_queue.push_fragment_uniform_data(ubo.binding, packed_blob);
          }
        }
      }
      
      // Bind textures for any separate_images
      if (refl.fragment && refl.fragment.separate_images) {
        for (def imgDesc of refl.fragment.separate_images) {
          def name = imgDesc.name;
          def binding = imgDesc.binding;
          def img = cmd.material[name];
          if (img) {
            // Ensure texture is on GPU
            if (!img[GPU]) {
              if (img.surface) {
                img[GPU] = get_img_gpu(img.surface);
              } else if (img.cpu) {
                img[GPU] = get_img_gpu(img.cpu);
              }
            }
            
            if (img[GPU]) {
              // Use material's sampler or default_sampler
              def sampler_desc = cmd.material.sampler || default_sampler;
              render_pass.bind_samplers(false, binding, [{
                texture: img[GPU],
                sampler: get_sampler(sampler_desc)
              }]);
            }
          }
        }
      }
    }
    
    // Only bind buffers if not already bound or pipeline changed
    if (!buffers_bound) {
      render_pass.bind_buffers(0, [
        { buffer: pos_buffer,   offset: 0 },
        { buffer: uv_buffer,    offset: 0 },
        { buffer: color_buffer, offset: 0 }
      ])
      
      render_pass.bind_index_buffer(
        { buffer: index_buffer, offset: 0 },  // the binding itself is in bytes
        16                                    // 16 = Uint32 indices
      );
      buffers_bound = true
    }
    
    // Rebind camera uniform if needed after pipeline change
    if (!current_camera_blob && cur_cam) {
      render_queue.push_vertex_uniform_data(0, cur_cam)
      current_camera_blob = cur_cam
    }
    
    // Bind default texture if material didn't already bind "diffuse"
    // Always bind the diffuse texture with material's sampler
    if (cmd.texture) {
      // Use material's sampler if specified, otherwise use default_sampler
      var sampler_desc = (cmd.material && cmd.material.sampler)
                       ? cmd.material.sampler
                       : default_sampler
      
      var sampler_obj = get_sampler(sampler_desc)
      render_pass.bind_samplers(false, 0, [{texture: cmd.texture, sampler: sampler_obj}])
    }
    
    render_pass.draw_indexed(
      cmd.num_indices,
      1,
      cmd.first_index,
      cmd.vertex_offset,
      0
    )
  }

  imgui.endframe(render_queue, render_pass)
  render_pass.end()

  render_queue.submit()
  
  if (done) done()
}

////////// dmon hot reload ////////
function poll_file_changes() {
  dmon.poll(e => {
    if (e.action == 'modify' || e.action == 'create') {
      // Check if it's an image file
      var ext = e.file.split('.').pop().toLowerCase()
      var imageExts = ['png', 'jpg', 'jpeg', 'gif', 'bmp', 'tga', 'webp', 'qoi', 'ase', 'aseprite']
      
      if (imageExts.includes(ext)) {
        // Try to find the full path for this image
        var possiblePaths = [
          e.file,
          e.root + e.file,
          res.find_image(e.file.split('/').pop().split('.')[0])
        ].filter(p => p)
        
        for (var path of possiblePaths) {
          graphics.tex_hotreload(path)
        }
      }
    }
  })
  
  $_.delay(poll_file_changes, 0.5)
}

var dmon = null //use('dmon')
prosperon.dmon = function()
{
  if (!dmon) return
  dmon.watch('.')
  poll_file_changes()
}

var window_cmds = {
  size(size) {
    window.size = size
  },
}

prosperon.set_window = function(config)
{
  for (var c in config)
    if (window_cmds[c]) window_cmds[c](config[c])
}

return prosperon