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
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)
    shader_program = jin.graphics.newShader(shader)
    shader_program2 = jin.graphics.newShader(shader2)
    --tex = jin.graphics.newTexture("1.png")
	tex = jin.graphics.newTexture(bitmap)
	local ssheet = jin.graphics.newSpriteSheet(tex)
    spr = ssheet:newSprite(50, 50, 50, 50)
	spr:setPosition(0, 50)
    tex = nil
    --spr:setScale(1, 1)
	spr:setColor(100, 0, 100, 255)
    spr:setOrigin(jin.graphics.SpriteOrigin.BOTTOMCENTER)
    -- 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()
    local h = timer:every(0.5, function(sp)
        local x, y = spr:getPosition()
        spr:move(5, 0)
    end, spr)
    timer:after(3, function(p)
        --timer:cancel(h)
    end, h)
	jin.graphics.pushMatrix()
	jin.graphics.translate(10, 0)
	--jin.graphics.rotate(0.2)
end
local stop = false

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

function jin.core.onUpdate() 
    tb.x = t
    t = t + jin.time.getDelta()
end

function jin.core.onDraw()
    timer:update(jin.time.getDelta())
    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()
    spr:render()
    --jin.graphics.draw(spr)
    --jin.graphics.useShader(shader_program2)
    --jin.graphics.draw(tex, 0, 0,0.2, 0.2)
    --jin.graphics.unuseShader()
    if stop then 
        jin.graphics.print("Quit", 100, 300)
    end 
end