matrix = matrix.Multiply(math3d.MakeZRotationMatrix(angle)).Transposed()
display()
}
// Free resources
free()
runtime.UnlockOSThread()
}
func free() {
program.Delete()
vboTriangle.Delete()
}
var matrix = math3d.MakeIdentity()
func display() {
// Clear the background as white
gl.ClearColor(1.0, 1.0, 1.0, 1.0)
gl.Clear(gl.COLOR_BUFFER_BIT)
// Use the GLSL program
program.Use()
uniformMTransform.UniformMatrix4fv(1, false, matrix)
vboTriangle.Bind(gl.ARRAY_BUFFER)
attributeCoord3d.EnableArray()
// Describe our vertices array to OpenGL (it can't guess its format automatically)
func main() {
// We need to lock the goroutine to one thread due time.Ticker
runtime.LockOSThread()
var err os.Error
err = glfw.Init()
if err != nil {
fmt.Printf("GLFW: %s\n", err)
return
}
defer glfw.Terminate()
// You could probably change the required versions down
glfw.OpenWindowHint(glfw.OpenGLVersionMajor, 3)
glfw.OpenWindowHint(glfw.OpenGLVersionMinor, 3)
glfw.OpenWindowHint(glfw.OpenGLProfile, 1)
// Open Window with 8 bit Alpha
err = glfw.OpenWindow(ScreenWidth, ScreenHeight, 0, 0, 0, 8, 8, 0, glfw.Windowed)
if err != nil {
fmt.Printf("GLFW: %s\n", err)
return
}
defer glfw.CloseWindow()
glfw.SetWindowTitle(WindowTitle)
glfw.SetWindowSizeCallback(onResize)
major, minor, rev := glfw.GLVersion()
if major < 3 {
fmt.Printf("Error your graphic card does not support OpenGL 3.3\n Your GL-Version is: %d, %d, %d\n", major, minor, rev)
fmt.Println("You can try to lower the settings in glfw.OpenWindowHint(glfw.OpenGLVersionMajor/Minor.")
}
initStatus := gl.Init() // Init glew
if initStatus != 0 {
fmt.Printf("Error-code: %d Init-Status: %d\n", gl.GetError(), initStatus)
}
// Enable transparency in OpenGL
gl.Enable(gl.BLEND)
gl.Enable(gl.DEPTH_TEST)
//gl.DepthFunc(gl.LESS)
gl.BlendFunc(gl.SRC_ALPHA, gl.ONE_MINUS_SRC_ALPHA)
initResources()
// We are limiting the calls to display() (frames per second) to 60. This prevents the 100% cpu usage.
ticker := time.NewTicker(int64(second) / 60) // max 60 fps
for {
<-ticker.C
angle := float32(glfw.Time())
anim := math3d.MakeYRotationMatrix(angle)
model := math3d.MakeTranslationMatrix(0, 0, -4)
view := math3d.MakeLookAtMatrix(math3d.Vector3{0, 2, 0}, math3d.Vector3{0, 0, -4}, math3d.Vector3{0, 1, 0})
projection := math3d.MakePerspectiveMatrix(45, float32(ScreenWidth)/float32(ScreenHeight), 0.1, 10.0)
matrix = math3d.MakeIdentity().Multiply(projection).Multiply(view).Multiply(model).Multiply(anim)
program.Use()
uniformMTransform.UniformMatrix4fv(1, false, matrix.Transposed())
display()
}
// Free resources
free()
runtime.UnlockOSThread()
}