Exemple #1
0
func (glRenderer *OpenglRenderer) loadTexture(img image.Image, textureUnit uint32, lod bool) uint32 {
	rgba := image.NewRGBA(img.Bounds())
	if rgba.Stride != rgba.Rect.Size().X*4 {
		log.Fatal("unsupported stride")
	}
	draw.Draw(rgba, rgba.Bounds(), img, image.Point{0, 0}, draw.Src)
	var texId uint32
	gl.GenTextures(1, &texId)
	gl.ActiveTexture(textureUnit)
	gl.BindTexture(gl.TEXTURE_2D, texId)
	if rgba.Rect.Size().X == 0 || rgba.Rect.Size().Y == 0 {
		return texId
	}
	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),
	)
	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)
	if lod {
		gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR_MIPMAP_LINEAR)
		gl.GenerateMipmap(gl.TEXTURE_2D)
	} else {
		gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR)
	}
	return texId
}
Exemple #2
0
// Render renders the model
func (m *Model) Render() {

	gl.UseProgram(m.currentProgram)
	gl.UniformMatrix4fv(m.modelUniform, 1, false, &m.model[0])

	gl.BindVertexArray(m.vao)

	gl.ActiveTexture(gl.TEXTURE0)

	texture, isLoaded := m.textures.GetTexture(m.data.TextureFile)

	if isLoaded {
		gl.BindTexture(gl.TEXTURE_2D, texture)
	} else {
		if m.data.TextureFile != "" {
			go fmt.Printf("Unable to load texture %s", m.data.TextureFile)
		}
	}

	if m.data.Indexed {
		gl.DrawElements(gl.TRIANGLE_FAN, int32(len(m.data.Indices)), gl.UNSIGNED_INT, gl.PtrOffset(0))
	} else {
		gl.DrawArrays(gl.TRIANGLES, 0, int32(len(m.data.Verts))/m.data.VertSize)
	}

	gl.BindVertexArray(0)
}
Exemple #3
0
func (me *GlObj) Draw(c *Core) {
	gl.UseProgram(c.Progs[me.Prog])
	gl.BindVertexArray(c.Vao[me.Vao])
	// shoud check if texture has been set for current object
	gl.ActiveTexture(gl.TEXTURE0)
	gl.BindTexture(gl.TEXTURE_2D, c.Textures[me.Texture])
	gl.DrawArrays(gl.TRIANGLES, 0, me.nbTriangles)
}
Exemple #4
0
func (glRenderer *OpenglRenderer) loadCubeMap(right, left, top, bottom, back, front image.Image, textureUnit uint32, lod bool) uint32 {
	var texId uint32
	gl.GenTextures(1, &texId)
	gl.ActiveTexture(textureUnit)
	gl.BindTexture(gl.TEXTURE_CUBE_MAP, texId)

	for i := 0; i < 6; i++ {
		img := right
		var texIndex uint32 = gl.TEXTURE_CUBE_MAP_POSITIVE_X
		switch i {
		case 1:
			img = left
			texIndex = gl.TEXTURE_CUBE_MAP_NEGATIVE_X
		case 2:
			img = top
			texIndex = gl.TEXTURE_CUBE_MAP_NEGATIVE_Y
		case 3:
			img = bottom
			texIndex = gl.TEXTURE_CUBE_MAP_POSITIVE_Y
		case 4:
			img = back
			texIndex = gl.TEXTURE_CUBE_MAP_NEGATIVE_Z
		case 5:
			img = front
			texIndex = gl.TEXTURE_CUBE_MAP_POSITIVE_Z
		}
		img = imaging.FlipV(img)
		rgba := image.NewRGBA(img.Bounds())
		if rgba.Stride != rgba.Rect.Size().X*4 {
			log.Fatal("unsupported stride")
		}
		draw.Draw(rgba, rgba.Bounds(), img, image.Point{0, 0}, draw.Src)
		gl.TexImage2D(
			texIndex,
			0,
			gl.RGBA,
			int32(rgba.Rect.Size().X),
			int32(rgba.Rect.Size().Y),
			0,
			gl.RGBA,
			gl.UNSIGNED_BYTE,
			gl.Ptr(rgba.Pix),
		)
		gl.TexParameteri(gl.TEXTURE_CUBE_MAP, gl.TEXTURE_MAG_FILTER, gl.LINEAR)
		gl.TexParameteri(gl.TEXTURE_CUBE_MAP, gl.TEXTURE_WRAP_S, gl.CLAMP_TO_EDGE)
		gl.TexParameteri(gl.TEXTURE_CUBE_MAP, gl.TEXTURE_WRAP_T, gl.CLAMP_TO_EDGE)
		gl.TexParameteri(gl.TEXTURE_CUBE_MAP, gl.TEXTURE_WRAP_R, gl.CLAMP_TO_EDGE)
		if lod {
			gl.TexParameteri(gl.TEXTURE_CUBE_MAP, gl.TEXTURE_MIN_FILTER, gl.LINEAR_MIPMAP_LINEAR)
			gl.GenerateMipmap(gl.TEXTURE_CUBE_MAP)
		} else {
			gl.TexParameteri(gl.TEXTURE_CUBE_MAP, gl.TEXTURE_MIN_FILTER, gl.LINEAR)
		}
	}
	return texId
}
Exemple #5
0
func (me *GlObj) Draw(c *Core) {
	gl.UseProgram(c.Progs[me.Prog])
	gl.BindVertexArray(c.Vao[me.Vao])
	// shoud check if texture has been set for current object
	// no need to be set again, if only one texture has been loaded
	// already binded/actived in new texture
	gl.ActiveTexture(gl.TEXTURE0)
	gl.BindTexture(gl.TEXTURE_2D, c.Textures[me.Texture])
	gl.DrawArrays(gl.TRIANGLES, 0, me.nbTriangles)
}
Exemple #6
0
/* Set current shader and activate textures */
func (mat *Material) Use() {
	mat.Shader.Use()
	var i uint32 = 0
	//for name, tex := range mat.Textures {
	for _, name := range mat.tex_slots {
		tex := mat.Textures[name]
		tex.Use(i)
		mat.Shader.Int32(name, int32(i))
		i++
	}
	gl.ActiveTexture(gl.TEXTURE0)
}
Exemple #7
0
func (font *Font) createTexture(text string, width int, height int, size float64, dpi float64, rgba color.Color) (uint32, int, int) {
	context := freetype.NewContext()
	context.SetFont(font.ttf)

	img := image.NewRGBA(image.Rect(0, 0, width, height))
	r, g, b, _ := rgba.RGBA()
	draw.Draw(img, img.Bounds(), image.NewUniform(color.RGBA{uint8(r), uint8(g), uint8(b), 0}), image.ZP, draw.Src)

	context.SetDst(img)
	context.SetClip(img.Bounds())
	context.SetSrc(image.NewUniform(rgba))
	context.SetFontSize(size)
	context.SetDPI(dpi)
	pixelBounds, _ := context.DrawString(text, freetype.Pt(0, height/2))

	var tex uint32
	gl.GenTextures(1, &tex)
	gl.ActiveTexture(gl.TEXTURE0)
	gl.BindTexture(gl.TEXTURE_2D, tex)
	gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR)
	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.ActiveTexture(gl.TEXTURE0)
	gl.BindTexture(gl.TEXTURE_2D, tex)

	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 tex, int26_6Ceiling(pixelBounds.X + 0x3f), int26_6Ceiling(pixelBounds.Y + 0x3f)
}
Exemple #8
0
func (glRenderer *OpenglRenderer) enableCubeMap() {
	if glRenderer.cubeMap == glRenderer.activeCubeMap {
		return
	}

	glRenderer.activeCubeMap = glRenderer.cubeMap
	cubeMap := glRenderer.activeCubeMap

	// setup cubeMap
	if glRenderer.activeShader != nil && cubeMap != nil {
		gl.ActiveTexture(gl.TEXTURE10)
		gl.BindTexture(gl.TEXTURE_CUBE_MAP, cubeMap.Id)
		glRenderer.activeShader.Uniforms[cubeMap.Name] = int32(10)
	}
}
Exemple #9
0
// Draw will draw the billvboard in the x,y and z
func (billboard *Billboard) Draw(x float32, y float32, z float32) {

	model := mgl32.Translate3D(x, y, z)

	if shader := shader.GetActive(); shader != nil {
		gl.UniformMatrix4fv(shader.Model, 1, false, &model[0])
	}

	gl.BindVertexArray(billboard.vao)

	gl.ActiveTexture(gl.TEXTURE0)
	gl.BindTexture(gl.TEXTURE_2D, billboard.image)

	gl.DrawArrays(gl.TRIANGLES, 0, 1*2*3)
}
Exemple #10
0
func (glRenderer *OpenglRenderer) renderPostEffect(pe postEffect) {
	gl.UseProgram(pe.program)
	gl.ActiveTexture(gl.TEXTURE0)
	gl.BindTexture(gl.TEXTURE_2D, pe.textureId)
	gl.Disable(gl.CULL_FACE)
	gl.BindBuffer(gl.ARRAY_BUFFER, glRenderer.postEffectVbo)

	setupUniforms(pe.shader)

	vertAttrib := uint32(gl.GetAttribLocation(pe.program, gl.Str("vert\x00")))
	gl.EnableVertexAttribArray(vertAttrib)
	gl.VertexAttribPointer(vertAttrib, 2, gl.FLOAT, false, 4*4, gl.PtrOffset(0))
	texCoordAttrib := uint32(gl.GetAttribLocation(pe.program, gl.Str("vertTexCoord\x00")))
	gl.EnableVertexAttribArray(texCoordAttrib)
	gl.VertexAttribPointer(texCoordAttrib, 2, gl.FLOAT, false, 4*4, gl.PtrOffset(2*4))

	gl.DrawArrays(gl.TRIANGLE_STRIP, 0, 4)
	gl.DisableVertexAttribArray(texCoordAttrib)
}
Exemple #11
0
func (me *Core) AddTexture(file string) int {
	imgFile, err := os.Open(file)
	if err != nil {
		fmt.Println("Could not open file:", file)
		panic(err)
	}
	img, _, err := image.Decode(imgFile)
	if err != nil {
		fmt.Println("Could not decode file:", file)
		panic(err)
	}

	rgba := image.NewRGBA(img.Bounds())
	if rgba.Stride != rgba.Rect.Size().X*FloatSize {
		fmt.Println("Stride unsupported, file:", file)
		panic(err)
	}
	draw.Draw(rgba, rgba.Bounds(), img, image.Point{0, 0}, draw.Src)

	var texture uint32
	gl.GenTextures(1, &texture)
	gl.ActiveTexture(gl.TEXTURE0)
	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))

	n := me.nbTexture
	me.Textures[n] = texture
	me.nbTexture++
	return n
}
Exemple #12
0
func (glRenderer *OpenglRenderer) enableMaterial() {
	if glRenderer.material == glRenderer.activeMaterial {
		return
	}

	glRenderer.activeMaterial = glRenderer.material
	glRenderer.useTextures = (glRenderer.activeMaterial != nil && len(glRenderer.activeMaterial.Textures) > 0)

	// setup material
	if glRenderer.activeShader != nil && glRenderer.activeMaterial != nil {
		textures := glRenderer.activeMaterial.Textures
		for i, tex := range textures {
			textureUnit := gl.TEXTURE0 + uint32(i)
			glRenderer.activeShader.Uniforms[tex.TextureName] = int32(i)
			gl.ActiveTexture(textureUnit)
			gl.BindTexture(gl.TEXTURE_2D, tex.TextureId)

		}
	}
}
Exemple #13
0
func (glRenderer *OpenglRenderer) CreatePostEffect(shader *renderer.Shader) {

	//Create program
	glRenderer.CreateShader(shader)
	gl.UseProgram(shader.Program)

	//Create Texture
	var fbo_texture uint32
	gl.ActiveTexture(gl.TEXTURE0)
	gl.GenTextures(1, &fbo_texture)
	gl.BindTexture(gl.TEXTURE_2D, fbo_texture)
	gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.LINEAR)
	gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_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(glRenderer.WindowWidth), int32(glRenderer.WindowHeight), 0, gl.RGBA, gl.UNSIGNED_BYTE, nil)

	//Create depth buffer
	var dbo uint32
	gl.GenRenderbuffers(1, &dbo)
	gl.BindRenderbuffer(gl.RENDERBUFFER, dbo)
	gl.RenderbufferStorage(gl.RENDERBUFFER, gl.DEPTH_COMPONENT16, int32(glRenderer.WindowWidth), int32(glRenderer.WindowHeight))
	gl.BindRenderbuffer(gl.RENDERBUFFER, 0)

	//Create frame buffer
	var fbo uint32
	gl.GenFramebuffers(1, &fbo)
	gl.BindFramebuffer(gl.FRAMEBUFFER, fbo)
	gl.FramebufferTexture2D(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.TEXTURE_2D, fbo_texture, 0)
	gl.FramebufferRenderbuffer(gl.FRAMEBUFFER, gl.DEPTH_ATTACHMENT, gl.RENDERBUFFER, dbo)

	//add new postEffect to the queue
	newPe := postEffect{
		program:   shader.Program,
		textureId: fbo_texture,
		dboId:     dbo,
		fboId:     fbo,
		shader:    shader,
	}
	glRenderer.postEffects = append(glRenderer.postEffects, newPe)
}
Exemple #14
0
func (t *Texture) create(file string) error {
	imgFile, err := os.Open(file)
	if err != nil {
		return fmt.Errorf("texture %q not found on disk: %v", file, err)
	}
	img, _, err := image.Decode(imgFile)
	if err != nil {
		return err
	}

	rgba := image.NewRGBA(img.Bounds())
	if rgba.Stride != rgba.Rect.Size().X*4 {
		return fmt.Errorf("unsupported stride")
	}
	draw.Draw(rgba, rgba.Bounds(), img, image.Point{0, 0}, draw.Src)

	var tex uint32
	gl.GenTextures(1, &tex)
	gl.ActiveTexture(gl.TEXTURE0)
	gl.BindTexture(gl.TEXTURE_2D, tex)
	gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR)
	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.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))

	t.id = tex
	t.Width = rgba.Rect.Size().X
	t.Height = rgba.Rect.Size().Y
	return nil
}
Exemple #15
0
func NewTexture(assetName string) (uint32, error) {
	data, err := Asset(assetName)
	if err != nil {
		return 0, err
	}

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

	rgba := image.NewRGBA(img.Bounds())
	if rgba.Stride != rgba.Rect.Size().X*4 {
		return 0, fmt.Errorf("unsupported stride")
	}
	draw.Draw(rgba, rgba.Bounds(), img, image.Point{0, 0}, draw.Src)

	var texture uint32
	gl.GenTextures(1, &texture)
	gl.ActiveTexture(gl.TEXTURE0)
	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 texture, nil
}
Exemple #16
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 {
		panic(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()
	}
}
Exemple #17
0
/** Binds this texture to the given texture slot */
func (tx *Texture) Use(slot uint32) {
	gl.ActiveTexture(gl.TEXTURE0 + slot)
	gl.Enable(gl.TEXTURE_2D)
	tx.Bind()
}
func (tex *Texture) Bind(texUnit uint32) {
	gl.ActiveTexture(texUnit)
	gl.BindTexture(tex.target, tex.handle)
	tex.texUnit = texUnit
}
Exemple #19
0
// Bind will set the current texture to the active texture
func (t *Texture) Bind() {
	gl.ActiveTexture(gl.TEXTURE0)
	gl.BindTexture(gl.TEXTURE_2D, t.id)
}
Exemple #20
0
func (t *Texture) BindTexture(unit uint32) {
	gl.ActiveTexture(gl.TEXTURE0 + unit)
	gl.BindTexture(gl.TEXTURE_2D, t.texture)
}
Exemple #21
0
func (t *Texture) UnbindTexture(unit uint32) {
	gl.ActiveTexture(gl.TEXTURE0 + unit)
	gl.BindTexture(gl.TEXTURE_2D, 0)
}
Exemple #22
-1
func (font *Font) updateTexture(texture uint32, text string, width int, height int, size float64, dpi float64, rgba color.Color) (int, int) {
	context := freetype.NewContext()
	context.SetFont(font.ttf)

	img := image.NewRGBA(image.Rect(0, 0, width, height))
	r, g, b, _ := rgba.RGBA()
	draw.Draw(img, img.Bounds(), image.NewUniform(color.RGBA{uint8(r), uint8(g), uint8(b), 0}), image.ZP, draw.Src)

	context.SetDst(img)
	context.SetClip(img.Bounds())
	context.SetSrc(image.NewUniform(rgba))
	context.SetFontSize(size)
	context.SetDPI(dpi)
	pixelBounds, _ := context.DrawString(text, freetype.Pt(0, height/2))

	gl.ActiveTexture(gl.TEXTURE0)
	gl.BindTexture(gl.TEXTURE_2D, texture)

	gl.TexSubImage2D(
		gl.TEXTURE_2D,
		0,
		0,
		0,
		int32(img.Rect.Size().X),
		int32(img.Rect.Size().Y),
		gl.RGBA,
		gl.UNSIGNED_BYTE,
		gl.Ptr(img.Pix))

	return int26_6Ceiling(pixelBounds.X + 0x3f), int26_6Ceiling(pixelBounds.Y + 0x3f)
}