func reshape(w *glfw.Window, width, height int) {
gl.Viewport(0, 0, width, height)
halfW, halfH := float32(width)*0.5, float32(height)*0.5
Projection = mgl.Ortho2D(-halfW, halfW, -halfH, halfH).Mul4(
mgl.Translate3D(-halfW, -halfH, 0))
go func(m mgl.Mat4f) { MVP <- m }(Projection.Mul4(ModelView))
}
func draw(width, height int) {
gl.Viewport(0, 0, width, height)
gl.Clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT)
gl.BindBuffer(gl.ARRAY_BUFFER, verticesArrayBuffer)
gl.VertexAttribPointer(attrPos, 4, gl.FLOAT, false, 0, 0)
gl.BindBuffer(gl.ARRAY_BUFFER, colorsArrayBuffer)
gl.VertexAttribPointer(attrColor, 4, gl.FLOAT, false, 0, 0)
gl.DrawArrays(gl.TRIANGLES, 0, 3)
gl.Flush()
gl.Finish()
}
func draw(width, height int) {
gl.Viewport(0, 0, width, height)
gl.Clear(gl.COLOR_BUFFER_BIT)
gl.BindBuffer(gl.ARRAY_BUFFER, verticesArrayBuffer)
gl.VertexAttribPointer(attrPos, 4, gl.FLOAT, false, 6*4, 0)
// bind texture - FIX size of vertex
gl.VertexAttribPointer(attrTexIn, 2, gl.FLOAT, false, 6*4, 4*4)
gl.ActiveTexture(gl.TEXTURE0)
gl.BindTexture(gl.TEXTURE_2D, textureBuffer)
gl.Uniform1i(unifTexture, 0)
gl.DrawArrays(gl.TRIANGLE_FAN, 0, 4)
gl.Flush()
gl.Finish()
}
func main() {
flag.Parse()
glfw.SetErrorCallback(errorCallback)
if !glfw.Init() {
println("glfw init failure")
}
defer glfw.Terminate()
glfw.WindowHint(glfw.ClientApi, glfw.OpenglEsApi)
glfw.WindowHint(glfw.ContextVersionMajor, 2)
glfw.WindowHint(glfw.ContextVersionMinor, 0)
window, err := glfw.CreateWindow(Width, Height, Title, nil, nil)
if err != nil {
panic(err)
}
defer window.Destroy()
window.MakeContextCurrent()
glfw.SwapInterval(1)
window.SetSizeCallback(reshape)
window.SetKeyCallback(keyEvent)
gl.Viewport(0, 0, Width, Height)
initScene()
if *debug {
go func() {
tick := time.Tick(1 * time.Second)
for {
<-tick
fmt.Printf("FPS:%v\tGOROUTINE:%v\r", atomic.LoadUint64(fps), runtime.NumGoroutine())
atomic.StoreUint64(fps, 0)
}
}()
}
for !window.ShouldClose() {
drawScene()
window.SwapBuffers()
glfw.PollEvents()
atomic.AddUint64(fps, 1)
}
}
func reshape(width, height int) {
currWidth, currHeight = width, height
gl.Viewport(0, 0, width, height)
}