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
}
// 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)
}
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)
}
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
}
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)
}
/* 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)
}
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)
}
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)
}
}
// 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)
}
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)
}
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
}
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)
}
}
}
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)
}
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
}
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
}
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()
}
}
/** 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
}
// 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)
}
func (t *Texture) BindTexture(unit uint32) {
gl.ActiveTexture(gl.TEXTURE0 + unit)
gl.BindTexture(gl.TEXTURE_2D, t.texture)
}
func (t *Texture) UnbindTexture(unit uint32) {
gl.ActiveTexture(gl.TEXTURE0 + unit)
gl.BindTexture(gl.TEXTURE_2D, 0)
}
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)
}