func NewGLRenderer(view *View, title string) *GLRenderer {
r := new(GLRenderer)
r.View = view
GL <- func() {
if sdl.Init(sdl.INIT_VIDEO) < 0 {
panic(sdl.GetError())
}
sdl.GL_SetAttribute(sdl.GL_DOUBLEBUFFER, 1)
sdl.GL_SetAttribute(sdl.GL_SWAP_CONTROL, 1)
r.Screen = sdl.SetVideoMode(view.Width, view.Height, 32, sdl.OPENGL)
if r.Screen == nil {
panic(sdl.GetError())
}
sdl.WM_SetCaption(title, title)
err := gl33.Init()
if err != nil {
panic(err)
}
gl33.Enable(gl33.BLEND)
gl33.Enable(gl33.CULL_FACE)
gl33.Enable(gl33.DEPTH_TEST)
gl33.ClearColor(1.0, 1.0, 1.0, 1.0)
gl33.BlendFunc(gl33.SRC_ALPHA, gl33.ONE_MINUS_SRC_ALPHA)
gl33.DepthFunc(gl33.LEQUAL)
gl33.Viewport(0, 0, gl33.Sizei(view.Width), gl33.Sizei(view.Height))
}
r.PerspectiveMatrix = s3dm.PerspectiveMatrix(view.Fovy, view.Aspect, view.Near, view.Far)
r.OrthographicMatrix = s3dm.OrthographicMatrix(float64(view.Width), float64(view.Height), 0, 1)
return r
}
func main() {
var err 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, 0, 0, glfw.Windowed)
if err != nil {
fmt.Printf("GLFW: %s\n", err)
return
}
defer glfw.CloseWindow()
glfw.SetWindowTitle(WindowTitle)
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.")
}
// Init extension loading
err = gl.Init()
if err != nil {
fmt.Printf("Init OpenGL extension loading failed with %s.\n", err)
}
// Enable transparency in OpenGL
gl.Enable(gl.BLEND)
gl.BlendFunc(gl.SRC_ALPHA, gl.ONE_MINUS_SRC_ALPHA)
initResources()
for {
display()
}
// Free resources
free()
}
func main() {
var window *sdl.Window
var context sdl.GLContext
var event sdl.Event
var running bool
var err error
runtime.LockOSThread()
if err = sdl.Init(sdl.INIT_EVERYTHING); err != nil {
panic(err)
}
defer sdl.Quit()
window, err = sdl.CreateWindow(winTitle, sdl.WINDOWPOS_UNDEFINED,
sdl.WINDOWPOS_UNDEFINED,
winWidth, winHeight, sdl.WINDOW_OPENGL)
if err != nil {
panic(err)
}
defer window.Destroy()
context, err = sdl.GL_CreateContext(window)
if err != nil {
panic(err)
}
defer sdl.GL_DeleteContext(context)
gl.Init()
gl.Viewport(0, 0, gl.Sizei(winWidth), gl.Sizei(winHeight))
// OPENGL FLAGS
gl.ClearColor(0.0, 0.1, 0.0, 1.0)
gl.Enable(gl.DEPTH_TEST)
gl.DepthFunc(gl.LESS)
gl.Enable(gl.BLEND)
gl.BlendFunc(gl.SRC_ALPHA, gl.ONE_MINUS_SRC_ALPHA)
// VERTEX BUFFER
var vertexbuffer gl.Uint
gl.GenBuffers(1, &vertexbuffer)
gl.BindBuffer(gl.ARRAY_BUFFER, vertexbuffer)
gl.BufferData(gl.ARRAY_BUFFER, gl.Sizeiptr(len(triangle_vertices)*4), gl.Pointer(&triangle_vertices[0]), gl.STATIC_DRAW)
// COLOUR BUFFER
var colourbuffer gl.Uint
gl.GenBuffers(1, &colourbuffer)
gl.BindBuffer(gl.ARRAY_BUFFER, colourbuffer)
gl.BufferData(gl.ARRAY_BUFFER, gl.Sizeiptr(len(triangle_colours)*4), gl.Pointer(&triangle_colours[0]), gl.STATIC_DRAW)
// GUESS WHAT
program := createprogram()
// VERTEX ARRAY
var VertexArrayID gl.Uint
gl.GenVertexArrays(1, &VertexArrayID)
gl.BindVertexArray(VertexArrayID)
gl.EnableVertexAttribArray(0)
gl.BindBuffer(gl.ARRAY_BUFFER, vertexbuffer)
gl.VertexAttribPointer(0, 3, gl.FLOAT, gl.FALSE, 0, nil)
// VERTEX ARRAY HOOK COLOURS
gl.EnableVertexAttribArray(1)
gl.BindBuffer(gl.ARRAY_BUFFER, colourbuffer)
gl.VertexAttribPointer(1, 3, gl.FLOAT, gl.FALSE, 0, nil)
//UNIFORM HOOK
unistring := gl.GLString("scaleMove")
UniScale = gl.GetUniformLocation(program, unistring)
fmt.Printf("Uniform Link: %v\n", UniScale+1)
gl.UseProgram(program)
running = true
for running {
for event = sdl.PollEvent(); event != nil; event =
sdl.PollEvent() {
switch t := event.(type) {
case *sdl.QuitEvent:
running = false
case *sdl.MouseMotionEvent:
xrot = float32(t.Y) / 2
yrot = float32(t.X) / 2
fmt.Printf("[%dms]MouseMotion\tid:%d\tx:%d\ty:%d\txrel:%d\tyrel:%d\n", t.Timestamp, t.Which, t.X, t.Y, t.XRel, t.YRel)
}
}
drawgl()
sdl.GL_SwapWindow(window)
}
}
// TODO Allow different blend functions
func EnableBlend() {
gl.Enable(gl.BLEND)
gl.BlendFunc(gl.SRC_ALPHA, gl.ONE_MINUS_SRC_ALPHA)
}