func main() {
if err := glfw.Init(); err != nil {
log.Fatalln("failed to initialize glfw:", err)
}
defer glfw.Terminate()
glfw.WindowHint(glfw.Resizable, glfw.False)
glfw.WindowHint(glfw.ContextVersionMajor, 2)
glfw.WindowHint(glfw.ContextVersionMinor, 1)
window, err := glfw.CreateWindow(800, 600, "Cube", nil, nil)
if err != nil {
panic(err)
}
window.MakeContextCurrent()
if err := gl.Init(); err != nil {
panic(err)
}
texture = newTexture("square.png")
defer gl.DeleteTextures(1, &texture)
setupScene()
for !window.ShouldClose() {
drawScene()
window.SwapBuffers()
glfw.PollEvents()
}
}
func (u *userInterface) loop(g GraphicsContext) error {
defer func() {
_ = u.runOnMainThread(func() error {
glfw.Terminate()
return nil
})
}()
for {
if err := u.update(g); err != nil {
return err
}
// The bound framebuffer must be the default one (0) before swapping buffers.
if err := glContext.BindScreenFramebuffer(); err != nil {
return err
}
if err := u.runOnMainThread(func() error {
return u.swapBuffers()
}); err != nil {
return err
}
}
}
func main() {
if err := glfw.Init(); err != nil {
log.Fatalln("failed to initialize glfw:", err)
}
defer glfw.Terminate()
glfw.WindowHint(glfw.Resizable, glfw.False)
glfw.WindowHint(glfw.ContextVersionMajor, 4)
glfw.WindowHint(glfw.ContextVersionMinor, 1)
glfw.WindowHint(glfw.OpenGLProfile, glfw.OpenGLCoreProfile)
glfw.WindowHint(glfw.OpenGLForwardCompatible, glfw.True)
window, err := glfw.CreateWindow(windowWidth, windowHeight, "Cube", nil, nil)
if err != nil {
panic(err)
}
window.MakeContextCurrent()
// Initialize Glow
if err := gl.Init(); err != nil {
panic(err)
}
version := gl.GoStr(gl.GetString(gl.VERSION))
fmt.Println("OpenGL version", version)
// Configure the vertex and fragment shaders
program, err := newProgram(vertexShader, fragmentShader)
if err != nil {
panic(err)
}
gl.UseProgram(program)
projection := mgl32.Perspective(mgl32.DegToRad(45.0), float32(windowWidth)/windowHeight, 0.1, 10.0)
projectionUniform := gl.GetUniformLocation(program, gl.Str("projection\x00"))
gl.UniformMatrix4fv(projectionUniform, 1, false, &projection[0])
camera := mgl32.LookAtV(mgl32.Vec3{3, 3, 3}, mgl32.Vec3{0, 0, 0}, mgl32.Vec3{0, 1, 0})
cameraUniform := gl.GetUniformLocation(program, gl.Str("camera\x00"))
gl.UniformMatrix4fv(cameraUniform, 1, false, &camera[0])
model := mgl32.Ident4()
modelUniform := gl.GetUniformLocation(program, gl.Str("model\x00"))
gl.UniformMatrix4fv(modelUniform, 1, false, &model[0])
textureUniform := gl.GetUniformLocation(program, gl.Str("tex\x00"))
gl.Uniform1i(textureUniform, 0)
gl.BindFragDataLocation(program, 0, gl.Str("outputColor\x00"))
// Load the texture
texture, err := newTexture("square.png")
if err != nil {
log.Fatalln(err)
}
// Configure the vertex data
var vao uint32
gl.GenVertexArrays(1, &vao)
gl.BindVertexArray(vao)
var vbo uint32
gl.GenBuffers(1, &vbo)
gl.BindBuffer(gl.ARRAY_BUFFER, vbo)
gl.BufferData(gl.ARRAY_BUFFER, len(cubeVertices)*4, gl.Ptr(cubeVertices), gl.STATIC_DRAW)
vertAttrib := uint32(gl.GetAttribLocation(program, gl.Str("vert\x00")))
gl.EnableVertexAttribArray(vertAttrib)
gl.VertexAttribPointer(vertAttrib, 3, gl.FLOAT, false, 5*4, gl.PtrOffset(0))
texCoordAttrib := uint32(gl.GetAttribLocation(program, gl.Str("vertTexCoord\x00")))
gl.EnableVertexAttribArray(texCoordAttrib)
gl.VertexAttribPointer(texCoordAttrib, 2, gl.FLOAT, false, 5*4, gl.PtrOffset(3*4))
// Configure global settings
gl.Enable(gl.DEPTH_TEST)
gl.DepthFunc(gl.LESS)
gl.ClearColor(1.0, 1.0, 1.0, 1.0)
angle := 0.0
previousTime := glfw.GetTime()
for !window.ShouldClose() {
gl.Clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT)
// Update
time := glfw.GetTime()
elapsed := time - previousTime
previousTime = time
angle += elapsed
model = mgl32.HomogRotate3D(float32(angle), mgl32.Vec3{0, 1, 0})
// Render
gl.UseProgram(program)
gl.UniformMatrix4fv(modelUniform, 1, false, &model[0])
gl.BindVertexArray(vao)
gl.ActiveTexture(gl.TEXTURE0)
gl.BindTexture(gl.TEXTURE_2D, texture)
gl.DrawArrays(gl.TRIANGLES, 0, 6*2*3)
// Maintenance
window.SwapBuffers()
glfw.PollEvents()
}
}
func (w *Window) Show() {
if err := glfw.Init(); err != nil {
log.Fatalln("failed to initialize glfw:", err)
}
defer glfw.Terminate()
glfw.WindowHint(glfw.Resizable, glfw.False)
glfw.WindowHint(glfw.Resizable, glfw.True)
window, err := glfw.CreateWindow(w.W, w.H, w.Title, nil, nil)
if err != nil {
panic(err)
}
if err := gl.Init(); err != nil {
panic(err)
}
window.MakeContextCurrent()
if len(w.Icon) == 1 {
window.SetIcon(w.Icon)
}
if w.RestrictionsEnabled {
window.SetSizeLimits(w.MinW, w.MinH, w.MaxW, w.MaxH)
}
if w.Blend {
gl.Enable(gl.BLEND)
gl.BlendFunc(gl.SRC_ALPHA, gl.ONE_MINUS_SRC_ALPHA)
} else if w.Smooth {
gl.Enable(gl.SMOOTH)
gl.Enable(gl.POINT_SMOOTH)
gl.Enable(gl.LINE_SMOOTH)
gl.Enable(gl.POLYGON_SMOOTH)
gl.Enable(gl.RELATIVE_SMOOTH_CUBIC_CURVE_TO_NV)
gl.Enable(gl.RELATIVE_SMOOTH_QUADRATIC_CURVE_TO_NV)
} else if w.Multisample {
gl.Enable(gl.MULTISAMPLE)
}
reshape(w.W, w.H)
window.SetRefreshCallback(func(g *glfw.Window) { reshape(w.W, w.H) })
window.SetSizeCallback(func(g *glfw.Window, width int, height int) {
reshape(width, height)
w.W = width
w.H = height
})
version := gl.GoStr(gl.GetString(gl.VERSION))
if !silentMode {
fmt.Println("OpenGL version", version)
}
for !window.ShouldClose() {
//Reset?
gl.Clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT)
if w.DrawFunc != nil {
w.DrawFunc()
}
// Maintenance
gl.Flush()
window.SwapBuffers()
glfw.PollEvents()
}
}
func Run(charset string, charwidth, charheight int, eh EventHandler) {
mousetrans := mouseTranslator{}
keytrans := keyTranslator{}
defer eh.Fin(true)
width := 800
height := 600
// Initialize glfw and create window
err := glfw.Init()
Panic(err)
defer glfw.Terminate()
glfw.WindowHint(glfw.Resizable, glfw.True)
glfw.WindowHint(glfw.ContextVersionMajor, 2)
glfw.WindowHint(glfw.ContextVersionMinor, 1)
window, err := glfw.CreateWindow(width, height, "Roguelike", nil, nil)
defer window.Destroy()
Panic(err)
window.MakeContextCurrent()
// Initialize opengl
err = gl.Init()
Panic(err)
// Create shaders and program
program, err := gli.NewProgram(vertexShaderText, fragmentShaderText)
Panic(err)
defer program.Delete()
// Load and initialize texture
img, err := gli.LoadImage(charset)
Panic(err)
texture, err := gli.NewTexture(img,
gli.TextureFilter(gli.LINEAR, gli.LINEAR),
gli.TextureWrap(gli.CLAMP_TO_EDGE, gli.CLAMP_TO_EDGE))
Panic(err)
defer texture.Delete()
// Create Vertex ArrayObject
vao, err := gli.NewVAO()
Panic(err)
defer vao.Delete()
// Create grid
grid, err := NewGrid(charwidth, charheight, texture.Size().X, texture.Size().Y)
Panic(err)
grid.Resize(width, height)
vCoords, vIndex, vData := grid.Buffers()
// Create grid buffers
posvbo, err := gli.NewBuffer(vCoords)
Panic(err)
defer posvbo.Delete()
idxvbo, err := gli.NewBuffer(vIndex, gli.BufferElementArray())
Panic(err)
defer idxvbo.Delete()
vbo, err := gli.NewBuffer(vData, gli.BufferAccessFrequency(gli.DYNAMIC))
Panic(err)
defer vbo.Delete()
window.SetSizeCallback(func(win *glfw.Window, w, h int) {
//fmt.Printf("resize\n")
width = w
height = h
gl.Viewport(0, 0, int32(width), int32(height))
grid.Resize(width, height)
vCoords, vIndex, vData := grid.Buffers()
posvbo.Upload(vCoords)
idxvbo.Upload(vIndex)
vbo.Upload(vData)
})
window.SetKeyCallback(func(win *glfw.Window, key glfw.Key, scancode int, action glfw.Action, mods glfw.ModifierKey) {
//fmt.Printf("key=%v code=%d, action=%v, mods=%v\n", key, scancode, action, mods)
e, ok := keytrans.Key(key, action, mods)
if ok {
eh.Key(e)
}
})
window.SetCharCallback(func(win *glfw.Window, key rune) {
eh.Char(key)
//fmt.Printf("char=%d(%c)\n", key, key)
})
window.SetCursorPosCallback(func(win *glfw.Window, x float64, y float64) {
e, ok := mousetrans.Pos(x, y)
if ok {
eh.Mouse(e)
}
})
window.SetMouseButtonCallback(func(win *glfw.Window, button glfw.MouseButton, action glfw.Action, mods glfw.ModifierKey) {
e, ok := mousetrans.Button(button, action, mods)
if ok {
eh.Mouse(e)
}
})
// Set up VAO
vao.Enable(2, posvbo, program.Attrib("position"))
vao.Enable(2, vbo, program.Attrib("texCoord"),
gli.VAOStride(4))
vao.Enable(1, vbo, program.Attrib("foreColor"),
gli.VAOStride(4), gli.VAOOffset(2))
vao.Enable(1, vbo, program.Attrib("backColor"),
gli.VAOStride(4), gli.VAOOffset(3))
// Set uniforms
program.Uniform("tex").SetSampler(1)
program.Uniform("colorData[0]").SetFloat(colorData...)
program.Uniform("runeSize").SetFloat(float32(grid.RuneSize().X), float32(grid.RuneSize().Y))
gl.ClearColor(0.0, 0.0, 0.0, 1.0)
for !window.ShouldClose() && !eh.Fin(false) {
//fmt.Printf("draw\n")
// Render scene
grid.clearData()
eh.Draw(grid)
_, _, vData = grid.Buffers()
vbo.Update(0, vData)
gl.Clear(gl.COLOR_BUFFER_BIT)
// Draw scene
program.Use()
vao.Use()
texture.Use(1)
idxvbo.Use()
gl.DrawElements(gl.TRIANGLES, grid.Vertices(), gl.UNSIGNED_INT, gl.PtrOffset(0))
window.SwapBuffers()
glfw.WaitEvents()
}
}