performance.script

function init(self)
  msg.post(".", "acquire_input_focus")
  msg.post("@system:", "toggle_profile")
  msg.post("@render:", "clear_color", {color = vmath.vector4(1, 1, 1, 1)})
  -- size of texture when scaled to nearest power of two
  local width = 1024
  local height = 2048
  local channels = 4
  -- we have to create table with next fields: buffer, width, height, channels
  self.buffer_info = {
    buffer = buffer.create(width * height, {{name = hash("rgba"), type = buffer.VALUE_TYPE_UINT8, count = channels}}),
    width = width,
    height = height,
    channels = channels -- 3 for rgb, 4 for rgba
  }
  self.dirty = true
  self.current_color = vmath.vector4(0, 0, 0, 1)
  self.current_tool = "pencil"
  -- drawing params
  self.prev_pos = vmath.vector3()
  self.resource_path = go.get("#sprite", "texture0")
  self.header = {
    width = width,
    height = height,
    type = resource.TEXTURE_TYPE_2D,
    format = resource.TEXTURE_FORMAT_RGBA,
    num_mip_maps = 1
  }
end

local function mesure_time(self, times, fun, ...)
  local time = os.clock()
  for i=1, times do
    fun(self, ...)
  end
  print("time:" .. os.clock() - time)
end  

local function fill(self)
  drawpixels.fill(self.buffer_info, 255,0,0,0)
end
local function circle(self)
  drawpixels.filled_circle(self.buffer_info, 222,222,400,255,0,0,255)
end
local function rect(self)
  drawpixels.filled_rect(self.buffer_info, 222,222,400,255,255,0,0,255)
end

function update(self, dt)
  mesure_time(self, 1000, rect)
 -- mesure_time(self, 100, fill)
    resource.set_texture(self.resource_path, self.header, self.buffer_info.buffer)
end

function on_message(self, message_id, message, sender)
end

local function color_vector_to_bytes(color)
  return color.x * 255, color.y * 255, color.z * 255, color.w * 255
end

local function bytes_to_color_vector(r, g, b, a)
  return vmath.vector4(r / 255, g / 255, b / 255, a / 255)
end