Golang Context.CreateBuffer方法代码示例

// NewImages creates an *Images.
func NewImages(glctx gl.Context) *Images {
	program, err := CreateProgram(glctx, vertexShader, fragmentShader)
	if err != nil {
		panic(err)
	}

	p := &Images{
		glctx:         glctx,
		quadXY:        glctx.CreateBuffer(),
		quadUV:        glctx.CreateBuffer(),
		program:       program,
		pos:           glctx.GetAttribLocation(program, "pos"),
		mvp:           glctx.GetUniformLocation(program, "mvp"),
		uvp:           glctx.GetUniformLocation(program, "uvp"),
		inUV:          glctx.GetAttribLocation(program, "inUV"),
		textureSample: glctx.GetUniformLocation(program, "textureSample"),
	}

	glctx.BindBuffer(gl.ARRAY_BUFFER, p.quadXY)
	glctx.BufferData(gl.ARRAY_BUFFER, quadXYCoords, gl.STATIC_DRAW)
	glctx.BindBuffer(gl.ARRAY_BUFFER, p.quadUV)
	glctx.BufferData(gl.ARRAY_BUFFER, quadUVCoords, gl.STATIC_DRAW)

	return p
}

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)
}

// 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 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) {
	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 NewDynamicShape(glctx gl.Context, bufSize int) *DynamicShape {
	shape := &DynamicShape{StaticShape{glctx: glctx}}
	shape.VBO = glctx.CreateBuffer()
	glctx.BindBuffer(gl.ARRAY_BUFFER, shape.VBO)
	glctx.BufferInit(gl.ARRAY_BUFFER, bufSize, gl.DYNAMIC_DRAW)

	return shape
}

// newPianoKey creates a PianoKey with color and sound.
func newPianoKey(glctx gl.Context, keyColor util.RGBColor, note util.KeyNote) *PianoKey {
	key := new(PianoKey)
	key.keyColor = keyColor
	// Create buffer
	key.glBuf = glctx.CreateBuffer()
	glctx.BindBuffer(gl.ARRAY_BUFFER, key.glBuf)
	// Generate sound
	_ = al.OpenDevice()
	key.soundBuffers = al.GenBuffers(1)
	key.soundSources = al.GenSources(1)
	key.soundBuffers[0].BufferData(al.FormatStereo8, audio.GenSound(note), audio.SampleRate)
	key.soundSources[0].QueueBuffers(key.soundBuffers)
	return key
}

func ParticleEmitter(glctx gl.Context, origin mgl.Vec3, num int, rate float32) Emitter {
	bufSize := num * particleLen * vecSize
	vbo := glctx.CreateBuffer()
	glctx.BindBuffer(gl.ARRAY_BUFFER, vbo)
	glctx.BufferInit(gl.ARRAY_BUFFER, bufSize, gl.DYNAMIC_DRAW)

	return &particleEmitter{
		glctx:     glctx,
		VBO:       vbo,
		origin:    origin,
		rate:      rate,
		particles: make([]*particle, 0, num),
		num:       num,
	}
}

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)
}

// 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
}

// NewKey initializes a new Key
func NewKey(glctx gl.Context, x, y, z, length, width, height float32,
	color Color, idColor Color, tex []byte) *Key {

	r := &Key{
		glctx, x, y, z, length, width, height,
		[]byte{},
		color,
		idColor,
		glctx.CreateBuffer(),
		tex,
	}
	r.chart()

	glctx.BindBuffer(gl.ARRAY_BUFFER, r.buf)
	glctx.BufferData(gl.ARRAY_BUFFER, r.data, gl.STATIC_DRAW)

	return r
}

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 appStart(glctx gl.Context) {
	println("Starting")
	program, err = glutil.CreateProgram(glctx, vertexShader, fragmentShader)
	if err != nil {
		panic("error creating GL program: " + err.Error())
		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)

	SetScene(currentScene.Name)
}

func NewFloatBuffer(ctx gl.Context, data []float32, usage gl.Enum) FloatBuffer {
	buf := &floatBuffer{Buffer: ctx.CreateBuffer(), usage: usage}
	buf.Bind(ctx)
	buf.Update(ctx, data)
	return buf
}