Golang gl.BindTexture函数代码示例

func (c *Context) BindTexture(target int, texture *Texture) {
	if texture == nil {
		gl.BindTexture(uint32(target), 0)
		return
	}
	gl.BindTexture(uint32(target), texture.uint32)
}

func (view *GameView) Update(t, dt float64) {
	if dt > 1 {
		dt = 0
	}
	window := view.director.window
	console := view.console
	if joystickReset(glfw.Joystick1) {
		view.director.ShowMenu()
	}
	if joystickReset(glfw.Joystick2) {
		view.director.ShowMenu()
	}
	if readKey(window, glfw.KeyEscape) {
		view.director.ShowMenu()
	}
	updateControllers(window, console)
	console.StepSeconds(dt)
	gl.BindTexture(gl.TEXTURE_2D, view.texture)
	setTexture(console.Buffer())
	drawBuffer(view.director.window)
	gl.BindTexture(gl.TEXTURE_2D, 0)
	if view.record {
		view.frames = append(view.frames, copyImage(console.Buffer()))
	}
}

func createTexture() uint32 {
	var texture uint32
	gl.GenTextures(1, &texture)
	gl.BindTexture(gl.TEXTURE_2D, texture)
	gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.NEAREST)
	gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.NEAREST)
	gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.CLAMP_TO_EDGE)
	gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.CLAMP_TO_EDGE)
	gl.BindTexture(gl.TEXTURE_2D, 0)
	return texture
}

func NewTexture() *Texture {
	texture := createTexture()
	gl.BindTexture(gl.TEXTURE_2D, texture)
	gl.TexImage2D(
		gl.TEXTURE_2D, 0, gl.RGBA,
		textureSize, textureSize,
		0, gl.RGBA, gl.UNSIGNED_BYTE, nil)
	gl.BindTexture(gl.TEXTURE_2D, 0)
	t := Texture{}
	t.texture = texture
	t.lookup = make(map[string]int)
	t.ch = make(chan string, 1024)
	return &t
}

func LataaKuvat() {
	file, err := os.Open("tiles.png")
	if err != nil {
		panic("En saa avattua kuvatiedostoa: " + err.Error())
	}

	kuva, _, err := image.Decode(file)
	if err != nil {
		panic("Kuva on rikki: " + err.Error())
	}

	var texture uint32
	gl.GenTextures(1, &texture)

	gl.BindTexture(gl.TEXTURE_2D, texture)
	gl.TexImage2D(gl.TEXTURE_2D, 0, 4,
		int32(kuva.Bounds().Dx()), int32(kuva.Bounds().Dy()), 0,
		gl.RGBA, gl.UNSIGNED_BYTE,
		unsafe.Pointer(&kuva.(*image.RGBA).Pix[0]),
	)

	gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR)
	gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.LINEAR)

	gl.Enable(gl.TEXTURE_2D)
}

func newChipset(file string, tilesize int) chipset {
	imgFile, err := os.Open(file)
	if err != nil {
		log.Fatalf("texture %q not found on disk: %v\n", file, err)
	}
	img, _, err := image.Decode(imgFile)
	if err != nil {
		panic(err)
	}

	rgba := image.NewRGBA(img.Bounds())
	draw.Draw(rgba, rgba.Bounds(), img, image.ZP, draw.Src)

	var texture uint32
	gl.Enable(gl.TEXTURE_2D)
	gl.GenTextures(1, &texture)
	gl.BindTexture(gl.TEXTURE_2D, texture)
	gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR)
	gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.LINEAR)
	gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.CLAMP_TO_EDGE)
	gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.CLAMP_TO_EDGE)
	gl.TexImage2D(
		gl.TEXTURE_2D,
		0, gl.RGBA,
		int32(rgba.Rect.Size().X),
		int32(rgba.Rect.Size().Y),
		0,
		gl.RGBA,
		gl.UNSIGNED_BYTE,
		gl.Ptr(rgba.Pix))

	return chipset{width: rgba.Bounds().Dx(), height: rgba.Bounds().Dy(), handle: texture, tilesize: tilesize}
}

func (c *Context) bindTextureImpl(t Texture) error {
	_ = c.runOnContextThread(func() error {
		gl.BindTexture(gl.TEXTURE_2D, uint32(t))
		return nil
	})
	return nil
}

func (ctx *DrawContext) drawHud(o *orrery.Orrery, frametime time.Duration) {
	txt, size, err := ctx.createHudTexture(o, frametime)
	if err != nil {
		log.Fatalf(`can't create texture from text surface: %s`, err)
	}
	defer gl.DeleteTextures(1, &txt)

	gl.MatrixMode(gl.PROJECTION)
	gl.PushMatrix()
	gl.LoadIdentity()
	gl.Ortho(0.0, float64(ctx.width), float64(ctx.height), 0.0, -1.0, 1.0)
	gl.MatrixMode(gl.MODELVIEW)
	gl.LoadIdentity()
	gl.Clear(gl.DEPTH_BUFFER_BIT)

	gl.BindTexture(gl.TEXTURE_2D, txt)
	gl.Enable(gl.TEXTURE_2D)
	defer gl.Disable(gl.TEXTURE_2D)

	gl.Color3f(1, 1, 1)
	gl.Begin(gl.QUADS)
	gl.TexCoord2f(0, 0)
	gl.Vertex2f(0.0, 0.0)
	gl.TexCoord2f(1, 0)
	gl.Vertex2f(float32(size[0]), 0.0)
	gl.TexCoord2f(1, 1)
	gl.Vertex2f(float32(size[0]), float32(size[1]))
	gl.TexCoord2f(0, 1)
	gl.Vertex2f(0.0, float32(size[1]))
	gl.End()

	gl.PopMatrix()
}

func (img *glImage) DrawColoredAtXY(x, y int, color [4]float32) {
	// TODO have the state knwon globally somewhere so this does not need to be
	// called all the time
	gl.Enable(gl.TEXTURE_2D)
	gl.BindTexture(gl.TEXTURE_2D, img.id)

	gl.Begin(gl.QUADS)

	gl.Color4f(color[0], color[1], color[2], color[3])
	gl.TexCoord2f(img.left, img.top)
	gl.Vertex2i(int32(x), int32(y))

	gl.Color4f(color[0], color[1], color[2], color[3])
	gl.TexCoord2f(img.right, img.top)
	gl.Vertex2i(int32(x+img.Width), int32(y))

	gl.Color4f(color[0], color[1], color[2], color[3])
	gl.TexCoord2f(img.right, img.bottom)
	gl.Vertex2i(int32(x+img.Width), int32(y+img.Height))

	gl.Color4f(color[0], color[1], color[2], color[3])
	gl.TexCoord2f(img.left, img.bottom)
	gl.Vertex2i(int32(x), int32(y+img.Height))

	gl.End()
}

func loadTexture(fileName string) (uint32, error) {
	imgFile, err := os.Open("./res/textures/" + fileName)
	if err != nil {
		return 0, err
	}

	imgCfg, _, err := image.DecodeConfig(imgFile)
	if err != nil {
		return 0, err
	}
	_, err = imgFile.Seek(0, 0)
	if err != nil {
		return 0, err
	}

	w, h := int32(imgCfg.Width), int32(imgCfg.Height)

	img, _, err := image.Decode(imgFile)
	if err != nil {
		return 0, err
	}

	buffer := make([]byte, w*h*4)
	index := 0
	for y := 0; y < int(h); y++ {
		for x := 0; x < int(w); x++ {
			pixel := img.At(x, y).(color.NRGBA)
			buffer[index] = pixel.R
			buffer[index+1] = pixel.G
			buffer[index+2] = pixel.B
			buffer[index+3] = pixel.A

			index += 4
		}
	}

	var texture uint32

	gl.GenTextures(1, &texture)
	gl.BindTexture(gl.TEXTURE_2D, texture)
	gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.REPEAT)
	gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.REPEAT)
	gl.TexParameterf(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.NEAREST)
	gl.TexParameterf(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.NEAREST)

	gl.TexImage2D(
		gl.TEXTURE_2D,
		0,
		gl.RGBA8,
		w,
		h,
		0,
		gl.RGBA,
		gl.UNSIGNED_BYTE,
		gl.Ptr(buffer))

	return texture, nil
}

func (ctx *DrawContext) createHudTexture(o *orrery.Orrery, frametime time.Duration) (uint32, [2]int, error) {
	lines := []string{}

	if o.Paused {
		lines = append(lines, "PAUSED")
	}

	if ctx.verbose {
		lines = append(lines, []string{
			"WASD: Move, 1: Toggle wireframe, H: Toggle HUD verbosity, Q: Quit",
			"Mouse Wheel: Move fast, Mouse Btn #1: Spawn particle, V: Spawn 10 particles",
			"Space: Reset camera, P: Toggle pause",
		}...)
	}

	lines = append(lines, []string{
		fmt.Sprintf(` α: %0.2f θ: %0.2f`, ctx.cam.alpha, ctx.cam.theta),
		fmt.Sprintf(` x: %0.2f y: %0.2f z: %0.2f`, ctx.cam.Pos.X, ctx.cam.Pos.Y, ctx.cam.Pos.Z),
		fmt.Sprintf(` Last frame time: %s`, frametime),
	}...)

	if ctx.verbose {
		particles := o.Particles()
		lines = append(lines, fmt.Sprintf(`#P: %d`, len(particles)))
		for i, p := range particles {
			p.L.Lock()
			l := fmt.Sprintf(` π %d: %s`, i, p)
			p.L.Unlock()
			lines = append(lines, l)
		}
	}

	var txt uint32
	gl.GenTextures(1, &txt)

	gl.BindTexture(gl.TEXTURE_2D, txt)

	gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR)
	gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.LINEAR)
	gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_BASE_LEVEL, 0)
	gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAX_LEVEL, 0)

	bg := color.RGBA{0, 0, 0, 0}
	fg := color.RGBA{0, 255, 255, 255}
	img, err := ctx.txt.RenderMultiline(lines, 12.5, bg, fg)
	if err != nil {
		return 0, [2]int{0, 0}, err
	}
	v := reflect.ValueOf(img.Pix)
	gl.TexImage2D(gl.TEXTURE_2D, 0, gl.RGBA,
		int32(img.Bounds().Dx()), int32(img.Bounds().Dy()),
		0, gl.RGBA, gl.UNSIGNED_BYTE, unsafe.Pointer(v.Index(0).UnsafeAddr()))

	return txt, [2]int{img.Bounds().Dx(), img.Bounds().Dy()}, nil
}

func main() {
	runtime.LockOSThread()

	if err := glfw.Init(); err != nil {
		panic(err)
	}
	defer glfw.Terminate()

	window, err := glfw.CreateWindow(800, 600, "fontstash example", nil, nil)
	if err != nil {
		panic(err)
	}

	window.MakeContextCurrent()
	glfw.SwapInterval(1)
	gl.Init()

	data, err := ioutil.ReadFile(filepath.Join("..", "ClearSans-Regular.ttf"))
	if err != nil {
		panic(err)
	}

	gl.Enable(gl.TEXTURE_2D)

	tmpBitmap := make([]byte, 512*512)
	cdata, err, _, tmpBitmap := truetype.BakeFontBitmap(data, 0, 32, tmpBitmap, 512, 512, 32, 96)
	var ftex uint32
	gl.GenTextures(1, &ftex)
	gl.BindTexture(gl.TEXTURE_2D, ftex)
	gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR)
	gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.LINEAR)
	gl.TexImage2D(gl.TEXTURE_2D, 0, gl.ALPHA, 512, 512, 0,
		gl.ALPHA, gl.UNSIGNED_BYTE, unsafe.Pointer(&tmpBitmap[0]))

	gl.ClearColor(0.3, 0.3, 0.32, 1.)

	for !window.ShouldClose() {
		gl.Clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT)
		gl.MatrixMode(gl.PROJECTION)
		gl.LoadIdentity()
		gl.Ortho(0, 800, 600, 0, 0, 1)
		gl.MatrixMode(gl.MODELVIEW)
		gl.LoadIdentity()
		gl.Disable(gl.DEPTH_TEST)
		gl.Color4ub(255, 255, 255, 255)
		gl.Enable(gl.BLEND)
		gl.BlendFunc(gl.SRC_ALPHA, gl.ONE_MINUS_SRC_ALPHA)

		my_print(100, 100, "The quick brown fox jumps over the fence", ftex, cdata)

		window.SwapBuffers()
		glfw.PollEvents()
	}
}

func (stash *Stash) FlushDraw() {
	i := 0
	texture := stash.ttTextures[i]
	tt := true
	for {
		if texture.nverts > 0 {
			gl.Enable(gl.TEXTURE_2D)
			gl.BindTexture(gl.TEXTURE_2D, texture.id)
			for k := 0; k < texture.nverts; k++ {
				gl.Begin(gl.QUADS)
				gl.Color4fv(&texture.color[0])
				gl.TexCoord2f(texture.verts[k*4+2], texture.verts[k*4+3])
				gl.Vertex2f(texture.verts[k*4+0], texture.verts[k*4+1])
				k++
				gl.Color4fv(&texture.color[0])
				gl.TexCoord2f(texture.verts[k*4+2], texture.verts[k*4+3])
				gl.Vertex2f(texture.verts[k*4+0], texture.verts[k*4+1])
				k++
				gl.Color4fv(&texture.color[0])
				gl.TexCoord2f(texture.verts[k*4+2], texture.verts[k*4+3])
				gl.Vertex2f(texture.verts[k*4+0], texture.verts[k*4+1])
				k++
				gl.Color4fv(&texture.color[0])
				gl.TexCoord2f(texture.verts[k*4+2], texture.verts[k*4+3])
				gl.Vertex2f(texture.verts[k*4+0], texture.verts[k*4+1])
				gl.End()
			}
			gl.Disable(gl.TEXTURE_2D)
			texture.nverts = 0
		}
		if tt {
			if i < len(stash.ttTextures)-1 {
				i++
				texture = stash.ttTextures[i]
			} else {
				i = 0
				if len(stash.bmTextures) > 0 {
					texture = stash.bmTextures[i]
					tt = false
				} else {
					break
				}
			}
		} else {
			if i < len(stash.bmTextures)-1 {
				i++
				texture = stash.bmTextures[i]
			} else {
				break
			}
		}
	}
}

func NewTexture(img *image.RGBA, opts ...TextureOption) (*Texture, error) {
	if img.Stride != img.Rect.Size().X*4 {
		return nil, fmt.Errorf("unsupported stride in texture image")
	}
	opt := textureOption{
		filterMin: LINEAR,
		filterMag: LINEAR,
		wrap_s:    REPEAT,
		wrap_t:    REPEAT,
	}
	for _, o := range opts {
		o(&opt)
	}

	var id uint32
	gl.GenTextures(1, &id)
	gl.ActiveTexture(gl.TEXTURE0)
	gl.BindTexture(gl.TEXTURE_2D, id)
	defer gl.BindTexture(gl.TEXTURE_2D, 0)
	gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, int32(opt.filterMin))
	gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, int32(opt.filterMag))
	gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, int32(opt.wrap_s))
	gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, int32(opt.wrap_t))
	gl.TexImage2D(
		gl.TEXTURE_2D,
		0,
		gl.RGBA,
		int32(img.Rect.Size().X),
		int32(img.Rect.Size().Y),
		0,
		gl.RGBA,
		gl.UNSIGNED_BYTE,
		gl.Ptr(img.Pix))
	return &Texture{
		id:   id,
		size: img.Rect.Size(),
	}, nil
}

func (s *Shader) updateUniforms(projectedMatrix Matrix4f, material *Material) {
	if s.uniforms == nil {
		return
	}

	if material.texture != nil {
		material.texture.bind()
	} else {
		gl.BindTexture(gl.TEXTURE_2D, 0)
	}

	s.setUniformM("transform", projectedMatrix)
	s.setUniform("color", material.color)
}