Golang glutil.CreateProgram函数代码示例

func onStart(glctx gl.Context) {
	var err error
	program, err = glutil.CreateProgram(glctx, vertexShader, fragmentShader)
	if err != nil {
		log.Printf("[ERR] Failed creating GL program: %v", err)
		return
	}

	buf = glctx.CreateBuffer()
	glctx.BindBuffer(gl.ARRAY_BUFFER, buf)
	glctx.BufferData(gl.ARRAY_BUFFER, triangleData, gl.STATIC_DRAW)

	position = glctx.GetAttribLocation(program, "position")
	color = glctx.GetUniformLocation(program, "color")
	offset = glctx.GetUniformLocation(program, "offset")

	images = glutil.NewImages(glctx)
	fps = debug.NewFPS(images)

	statusFont, statusFace, err = exfont.LoadAsset("Tuffy.ttf", statusFaceOpt)
	if err != nil {
		log.Printf("[ERR] Failed to load status font: %v", err)
	}
	statusPainter = rexdemo.NewStatusPainter(demo, statusFont, statusBG, images)

	ifaces, err := net.Interfaces()
	if err != nil {
		log.Printf("[ERR] Failed to retreived interfaces")
	} else {
		log.Printf("[DEBUG] %d network interfaces", len(ifaces))
		for _, iface := range ifaces {
			log.Printf("[DEBUG] IFACE %d %s", iface.Index, iface.Name)
		}
	}
}

func NewButton(ctx gl.Context, x, y float32, w, h float32) *Button {
	btn := &Button{r: 1, g: 1, b: 1, a: 1}

	btn.x = (-(-1 - x)) / 2
	btn.y = (1 - y) / 2
	btn.w, btn.h = (w)/2, (-h)/2

	btn.verts = []float32{
		x, y, 0,
		x + w, y, 0,
		x, y + h, 0,
		x, y + h, 0,
		x + w, y, 0,
		x + w, y + h, 0,
	}

	btn.data = make([]byte, len(btn.verts)*4)

	var err error
	btn.program, err = glutil.CreateProgram(ctx, vertexShader, fragmentShader)
	if err != nil {
		panic(fmt.Errorf("error creating GL program: %v", err))
	}

	// create and alloc hw buf
	btn.buf = ctx.CreateBuffer()
	ctx.BindBuffer(gl.ARRAY_BUFFER, btn.buf)
	ctx.BufferData(gl.ARRAY_BUFFER, make([]byte, len(btn.verts)*4), gl.STATIC_DRAW)

	btn.position = ctx.GetAttribLocation(btn.program, "position")
	btn.color = ctx.GetUniformLocation(btn.program, "color")
	return btn
}

func onStart(glctx gl.Context, sz size.Event) {
	log.Printf("creating GL program")
	var err error
	keystate = map[touch.Sequence]int{}
	program, err = glutil.CreateProgram(glctx, vertexShader, fragmentShader)
	if err != nil {
		log.Printf("error creating GL program: %v", err)
		return
	}

	glctx.Enable(gl.DEPTH_TEST)

	position = glctx.GetAttribLocation(program, "position")
	texCordIn = glctx.GetAttribLocation(program, "texCordIn")
	color = glctx.GetUniformLocation(program, "color")
	drawi = glctx.GetUniformLocation(program, "drawi")
	projection = glctx.GetUniformLocation(program, "projection")
	camera = glctx.GetUniformLocation(program, "camera")

	loadTexture(glctx)
	glctx.UseProgram(program)

	projectionMat := mgl32.Perspective(mgl32.DegToRad(75.0), float32(1), 0.5, 40.0)
	glctx.UniformMatrix4fv(projection, projectionMat[:])

	cameraMat := mgl32.LookAtV(mgl32.Vec3{0.5, 0, 1.5}, mgl32.Vec3{0, 0, 0}, mgl32.Vec3{0, 1, 0})
	glctx.UniformMatrix4fv(camera, cameraMat[:])

	board = NewBoard(glctx, float32(0.05), 10)

	numKeys := len(board.bigKeys) + len(board.smallKeys)

	InitializeSound(numKeys)
}

// TODO just how many samples do we want/need to display something useful?
func NewWaveform(ctx gl.Context, n int, in Sound) (*Waveform, error) {
	wf := &Waveform{Sound: in}

	wf.outs = make([][]float64, n)
	for i := range wf.outs {
		wf.outs[i] = make([]float64, in.BufferLen()*in.Channels())
	}
	wf.samples = make([]float64, in.BufferLen()*in.Channels()*n)
	// wf.aligned = make([]float64, in.BufferLen()*in.Channels()*n)

	wf.verts = make([]float32, len(wf.samples)*3)
	wf.data = make([]byte, len(wf.verts)*4)

	if ctx == nil {
		return wf, nil
	}

	var err error
	wf.program, err = glutil.CreateProgram(ctx, vertexShader, fragmentShader)
	if err != nil {
		return nil, fmt.Errorf("error creating GL program: %v", err)
	}

	// create and alloc hw buf
	wf.buf = ctx.CreateBuffer()
	ctx.BindBuffer(gl.ARRAY_BUFFER, wf.buf)
	ctx.BufferData(gl.ARRAY_BUFFER, make([]byte, len(wf.samples)*12), gl.STREAM_DRAW)

	wf.position = ctx.GetAttribLocation(wf.program, "position")
	wf.color = ctx.GetUniformLocation(wf.program, "color")
	return wf, nil
}

func onStart() {
	var err error
	program, err = glutil.CreateProgram(vertexShader, fragmentShader)
	if err != nil {
		log.Printf("error creating GL program: %v", err)
		return
	}

	//创建一个WebGLBuffer对象，把它绑定到顶点缓冲上，并把顶点数据载入到顶点冲。
	buf = gl.CreateBuffer()
	gl.BindBuffer(gl.ARRAY_BUFFER, buf)
	gl.BufferData(gl.ARRAY_BUFFER, lineData, gl.STATIC_DRAW)

	/*opengl中三种变量
	  uniform变量是外部application程序传递给（vertex和fragment）shader的变量。因此它是application通过函数glUniform**（）函数赋值的。
	  在（vertex和fragment）shader程序内部，uniform变量就像是C语言里面的常量（const ），它不能被shader程序修改。（shader只能用，不能改）

	  attribute变量是只能在vertex shader中使用的变量。（它不能在fragment shader中声明attribute变量，也不能被fragment shader中使用）
	  一般用attribute变量来表示一些顶点的数据，如：顶点坐标，法线，纹理坐标，顶点颜色等。
	  在application中，一般用函数glBindAttribLocation（）来绑定每个attribute变量的位置，然后用函数glVertexAttribPointer（）为每个attribute变量赋值。

	  varying变量是vertex和fragment shader之间做数据传递用的。一般vertex shader修改varying变量的值，然后fragment shader使用该varying变量的值。
	  因此varying变量在vertex和fragment shader二者之间的声明必须是一致的。application不能使用此变量。
	*/
	position = gl.GetAttribLocation(program, "position") //获取位置对象(索引)
	color = gl.GetUniformLocation(program, "color")      // 获取颜色对象(索引)
	scan = gl.GetUniformLocation(program, "scan")        // 获取偏移对象(索引)
	// fmt.Println(position.String(),color.String(),offset.String())//Attrib(0) Uniform(1) Uniform(0)
	// TODO(crawshaw): the debug package needs to put GL state init here
	// Can this be an event.Register call now??
}

func onStart(glctx gl.Context) {
	var err error
	program, err = glutil.CreateProgram(glctx, vertexShader, fragmentShader)
	if err != nil {
		log.Printf("[ERR] Failed creating GL program: %v", err)
		return
	}

	buf = glctx.CreateBuffer()
	glctx.BindBuffer(gl.ARRAY_BUFFER, buf)
	glctx.BufferData(gl.ARRAY_BUFFER, triangleData, gl.STATIC_DRAW)

	position = glctx.GetAttribLocation(program, "position")
	color = glctx.GetUniformLocation(program, "color")
	offset = glctx.GetUniformLocation(program, "offset")

	images = glutil.NewImages(glctx)
	fps = debug.NewFPS(images)

	statusFont, statusFace, err = exfont.LoadAsset("Tuffy.ttf", statusFaceOpt)
	if err != nil {
		log.Printf("[ERR] Failed to load status font: %v", err)
	}
	statusPainter = rexdemo.NewStatusPainter(demo, statusFont, _color.White, images)
}

func createProgram(vShaderPath, fShaderPath string) gl.Program {
	// loading vertex shader
	vShader, e := loadSource(vShaderPath)
	def_check(e)
	// loading fragment shader
	fShader, e := loadSource(fShaderPath)
	def_check(e)
	// linking program
	program, e := glutil.CreateProgram(string(vShader), string(fShader))
	crash_check(e)
	return program
}

// LoadProgram reads shader sources from the asset repository, compiles, and
// links them into a program.
func LoadProgram(vertexAsset, fragmentAsset string) (p gl.Program, err error) {
	vertexSrc, err := loadAsset(vertexAsset)
	if err != nil {
		return
	}

	fragmentSrc, err := loadAsset(fragmentAsset)
	if err != nil {
		return
	}

	p, err = glutil.CreateProgram(string(vertexSrc), string(fragmentSrc))
	return
}

func onStart(glctx gl.Context) {
	var err error
	frameData.Program, err = glutil.CreateProgram(glctx, vertexShader, fragmentShader)
	if err != nil {
		log.Printf("error creating GL program: %v", err)
		return
	}

	frameData.Position = glctx.GetAttribLocation(frameData.Program, "position")
	frameData.Color = glctx.GetUniformLocation(frameData.Program, "color")
	frameData.Offset = glctx.GetUniformLocation(frameData.Program, "offset")
	manager = layers.NewLayerManager(glctx)
	manager.StartLayers()

}

func onStart(glctx gl.Context) {
	var err error
	program, err = glutil.CreateProgram(glctx, vertexShader, fragmentShader)
	if err != nil {
		log.Printf("error creating GL program: %v", err)
		return
	}
	buf = glctx.CreateBuffer()
	glctx.BindBuffer(gl.ARRAY_BUFFER, buf)
	glctx.BufferData(gl.ARRAY_BUFFER, triangleData, gl.STATIC_DRAW)
	position = glctx.GetAttribLocation(program, "position")
	color = glctx.GetUniformLocation(program, "color")
	offset = glctx.GetUniformLocation(program, "offset")
	images = glutil.NewImages(glctx)
	fps = debug.NewFPS(images)
}

func onStart() {
	var err error
	program, err = glutil.CreateProgram(vertexShader, fragmentShader)
	if err != nil {
		log.Printf("error creating GL program: %v", err)
		return
	}

	buf = gl.CreateBuffer()
	gl.BindBuffer(gl.ARRAY_BUFFER, buf)
	gl.BufferData(gl.ARRAY_BUFFER, rectData, gl.STATIC_DRAW)

	position = gl.GetAttribLocation(program, "position")
	color = gl.GetUniformLocation(program, "color")
	offset = gl.GetUniformLocation(program, "offset")
}

// NewGL returns a GL. ctx can be nil and the returned value can be nil, which
// is okay, a nil *GL functions correctly and doesn't crash.
func NewGL(ctx gl.Context) (*GL, error) {
	if ctx == nil {
		return nil, nil
	}
	program, err := glutil.CreateProgram(ctx, vertexShader, fragmentShader)
	if err != nil {
		return nil, err
	}
	g := &GL{
		ctx:      ctx,
		program:  program,
		buf:      ctx.CreateBuffer(),
		position: ctx.GetAttribLocation(program, "position"),
		color:    ctx.GetUniformLocation(program, "color"),
		offset:   ctx.GetUniformLocation(program, "offset"),
	}
	return g, nil
}

func onStart(glctx gl.Context) {
	var err error
	program, err = glutil.CreateProgram(glctx, vertexShader, fragmentShader)
	if err != nil {
		log.Printf("error creating GL program: %v", err)
		return
	}

	glctx.Enable(gl.DEPTH_TEST)

	triBuf = glctx.CreateBuffer()
	glctx.BindBuffer(gl.ARRAY_BUFFER, triBuf)
	glctx.BufferData(gl.ARRAY_BUFFER, triangleData, gl.STATIC_DRAW)

	position = glctx.GetAttribLocation(program, "vPos")
	color = glctx.GetAttribLocation(program, "vCol")
	normals = glctx.GetAttribLocation(program, "vNorm")

	projection = glctx.GetUniformLocation(program, "proj")
	view = glctx.GetUniformLocation(program, "view")
	model = glctx.GetUniformLocation(program, "model")
	tint = glctx.GetUniformLocation(program, "tint")
	normalMatrix = glctx.GetUniformLocation(program, "normalMatrix")
	lightIntensity = glctx.GetUniformLocation(program, "light.intensities")
	lightPos = glctx.GetUniformLocation(program, "light.position")

	arcball = NewArcBall(mgl32.Vec3{0, 0, 0}, mgl32.Vec3{0, 10, 10}, mgl32.Vec3{0, 1, 0})

	white = mgl32.Vec4{1.0, 1.0, 1.0, 1.0}
	red = mgl32.Vec4{1.0, 0.0, 0.0, 1.0}

	lastUpdate = time.Now()

	images = glutil.NewImages(glctx)
	fps = debug.NewFPS(images)

	err = al.OpenDevice()
	if err != nil {
		log.Printf("Err: %+v", err)
	}
	al.SetListenerPosition(al.Vector{0, 0, 0})
	al.SetListenerGain(1.0)
	piano = NewPiano()
}

func onStart(glctx gl.Context) {
	var err error
	program, err = glutil.CreateProgram(glctx, vertexShader, fragmentShader)
	if err != nil {
		log.Printf("error creating GL program: %v", err)
		return
	}

	triangleData = genCircleTriangles(0.0, 0.0, 0.5)

	buf = glctx.CreateBuffer()

	position = glctx.GetAttribLocation(program, "position")
	color = glctx.GetUniformLocation(program, "color")
	offset = glctx.GetUniformLocation(program, "offset")

	images = glutil.NewImages(glctx)
	fps = debug.NewFPS(images)
}

func onStart() {
	var err error
	program, err = glutil.CreateProgram(vertexShader, fragmentShader)
	if err != nil {
		log.Printf("error creating GL program: %v", err)
		return
	}

	buf = gl.CreateBuffer()
	gl.BindBuffer(gl.ARRAY_BUFFER, buf)
	gl.BufferData(gl.ARRAY_BUFFER, triangleData, gl.STATIC_DRAW)

	position = gl.GetAttribLocation(program, "position")
	color = gl.GetUniformLocation(program, "color")
	offset = gl.GetUniformLocation(program, "offset")

	// TODO(crawshaw): the debug package needs to put GL state init here
	// Can this be an app.RegisterFilter call now??
}