Example #1
0
func initialize() error {
	runtime.LockOSThread()

	if err := glfw.Init(); err != nil {
		return err
	}
	glfw.WindowHint(glfw.Visible, glfw.False)
	glfw.WindowHint(glfw.Resizable, glfw.False)
	glfw.WindowHint(glfw.ContextVersionMajor, 2)
	glfw.WindowHint(glfw.ContextVersionMinor, 1)

	// As start, create an window with temporary size to create OpenGL context thread.
	window, err := glfw.CreateWindow(16, 16, "", nil, nil)
	if err != nil {
		return err
	}
	u := &userInterface{
		window:      window,
		funcs:       make(chan func()),
		sizeChanged: true,
	}
	u.window.MakeContextCurrent()
	glfw.SwapInterval(1)
	currentUI = u
	return nil
}
Example #2
0
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()
	}
}
Example #3
0
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()
	}
}
Example #4
0
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()
	}
}
Example #5
0
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()
	}
}