io.stdout:setvbuf("no")
local shader = [[ 
#VERTEX_SHADER 

	Vertex vert(Vertex v) 
	{
		return v;
	}

#END_VERTEX_SHADER

#FRAGMENT_SHADER 

	Color frag(Color col, Texture tex, Vertex v)
	{
		return col;
	}

#END_FRAGMENT_SHADER
]]

local shader2 = [[ 
#VERTEX_SHADER 

	Vertex vert(Vertex v) 
	{
		return v;
	}

#END_VERTEX_SHADER

#FRAGMENT_SHADER 

	Color frag(Color col, Texture tex, Vertex v)
	{
		if(v.xy.x > 30)
			return Color(1, 0, 0, 1);
		Color c = texel(tex, v.uv);
		return c;
	}
  
#END_FRAGMENT_SHADER
]]
music = nil
local tex = nil
local shader_program = nil
local shader_program2 = nil
local timer = nil
local tb = {x = 1, y = 2}
local t = 0
local spr = nil 
local bitmap = nil
local sprs = {}
local animator = nil
local spr = nil
local particle_sprite = nil
local ps = nil
local function createAnimation(path, count, r, c, w, h, loop, speed)
	local tex = jin.graphics.newTexture(path)
	local ssheet = jin.graphics.newSpriteSheet(tex)
	local sprs = ssheet:newSprites(count, r, c, w, h, 96, 168)
	return jin.graphics.newAnimation(sprs, loop, speed)
end
local particle_sprites = {}
local Pi = 3.1415
function jin.core.onLoad()
	-- bitmap = jin.graphics.newBitmap(200, 200, function(w, h, x, y)
		-- return {255*math.sin(x/w),255 - 255,255*math.cos(y/w),255}
	-- end)
	local tex = jin.graphics.newTexture("particle.png")
	particle_sprite = jin.graphics.newSprite(tex, jin.graphics.SpriteOrigin.MIDDLECENTER)
	ps = jin.graphics.newParticleSystem()
	for i = 0, 10 do 
		local t = jin.graphics.newTexture("dust/s_dust_A_" .. i .. ".png")
		local spr = jin.graphics.newSprite(t, jin.graphics.SpriteOrigin.MIDDLECENTER)
		ps:addParticleSprite(spr)
	end
	ps:setEmitRate(0.02)
    ps:setEmitForce(80, 120)
    ps:setEmitPosition({0, 0})
    ps:setEmitDirection(-Pi / 10 - Pi / 2, Pi / 10 - Pi / 2)
    ps:setParticleLinearAccelaration({0, 10})
    ps:setParticleSpritesMode(jin.graphics.SpriteMode.ANIMATED)
	ps:setParticleColor({255, 30, 0, 255})
    ps:addParticleTransparencyPoint(1, 0)
    ps:addParticleTransparencyPoint(0, 0.5)
    ps:enableParticleBlendAdditive(true)
    ps:setParticleLife(0.5, 2)
    ps:addParticleScalePoint(3, 0)
    ps:addParticleScalePoint(0, 1)
	--ps:addParticleSprite(particle_sprite)
    shader_program = jin.graphics.newShader(shader)
    shader_program2 = jin.graphics.newShader(shader2)
	local animation = createAnimation("anim2.png", 27, 3, 10, 200, 200, true, 50)
	animator = jin.graphics.newAnimator(animation)
	spr = animation:getFrame(1)
	local tex3 = jin.graphics.newTexture("anim2.png")
	tex3 = nil
    -- music = jin.audio.newSource("forest.ogg")
    -- music:setVolume(0.5)
    -- music:setLoop(true)
    -- music:play()
    jin.graphics.clear()
    jin.graphics.showWindow()
    timer = jin.time.newTimer()
    timer:every(3, function(p)
        --timer:cancel(h)
		if animator:getSpeed() == 50 then 
			animator:setSpeed(100)
		elseif animator:getSpeed() == 100 then 
			animator:setSpeed(50)
		end
	end, animator)
	jin.graphics.pushMatrix()
	jin.graphics.translate(0, 0)
	--jin.graphics.rotate(0.2)
end

function jin.core.onEvent(e)
    if e.type == "Quit" then 
        jin.core.stop()
    end
end

function jin.core.onUpdate(dt)
    tb.x = t
    t = t + jin.time.getDelta()
	animator:update(jin.time.getDelta())
	timer:update(jin.time.getDelta())
	ps:update(dt)
	local mx, my = jin.mouse.getPosition()
	ps:setPosition(mx, my)
end

function jin.core.onDraw()
    jin.graphics.useShader(shader_program) 
    jin.graphics.setColor(255, 0, 255, 255)
    jin.graphics.rect(jin.graphics.RenderMode.FILL, 30, 50, 100, 200)
    jin.graphics.setColor(255, 255, 255, 255)
    jin.graphics.unuseShader()
    --jin.graphics.draw(sprs[2], 150, 150, 1, 1, 0)
	local x, y = jin.mouse.getPosition()
	animator:render(50, 150, 1, 1, 0)
	--jin.graphics.print(#sprs, 10, 10)
    jin.graphics.draw(spr, 100, 200, 1, 1, 0)
    --jin.graphics.useShader(shader_program2)
    --jin.graphics.draw(tex, 0, 0,0.2, 0.2)
    --jin.graphics.unuseShader()
    ps:render()
end