// loadFont loads the given font data. This does not deal with font scaling.
// Scaling should be handled by the independent Bitmap/Truetype loaders.
// We therefore expect the supplied image and charset to already be adjusted
// to the correct font scale.
//
// The image should hold a sprite sheet, defining the graphical layout for
// every glyph. The config describes font metadata.
func loadFont(img *image.RGBA, config *FontConfig) (f *Font, err error) {
f = new(Font)
f.Config = config
// Resize image to next power-of-two.
img = glh.Pow2Image(img).(*image.RGBA)
ib := img.Bounds()
f.Width = ib.Dx()
f.Height = ib.Dy()
// Create the texture itself. It will contain all glyphs.
// Individual glyph-quads display a subset of this texture.
f.Texture = gl.GenTexture()
f.Texture.Bind(gl.TEXTURE_2D)
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.RGBA, ib.Dx(), ib.Dy(), 0,
gl.RGBA, gl.UNSIGNED_BYTE, img.Pix)
// file, err := os.Create("font.png")
// if err != nil {
// log.Fatal(err)
// }
// err = png.Encode(file, img)
// if err != nil {
// log.Fatal(err)
// }
return
}
func (v *Video) Init(w int, h int) {
var err error
if err = glfw.Init(); err != nil {
log.Fatal(err)
}
glfw.OpenWindowHint(glfw.WindowNoResize, gl.TRUE)
if err = glfw.OpenWindow(w, h, 8, 8, 8, 0, 24, 0, glfw.Windowed); err != nil {
log.Fatal(err)
}
if gl.Init() != 0 {
log.Fatal("ummm... hmmm")
}
glfw.SetWindowSizeCallback(resize)
gl.Enable(gl.TEXTURE_2D)
resize(w, h)
v.Texture = gl.GenTexture()
}
// Creates a new Framebuffer.
func NewFramebuffer(w int, h int) (fb *Framebuffer, err error) {
var (
buffer gl.Framebuffer
texture gl.Texture
)
buffer = gl.GenFramebuffer()
buffer.Bind()
texture = gl.GenTexture()
texture.Bind(gl.TEXTURE_2D)
gl.TexImage2D(gl.TEXTURE_2D, 0, gl.RGBA, w, h, 0, gl.RGBA, gl.UNSIGNED_BYTE, nil)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.NEAREST)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.NEAREST)
gl.FramebufferTexture2D(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.TEXTURE_2D, texture, 0)
gl.DrawBuffer(gl.COLOR_ATTACHMENT0)
if gl.CheckFramebufferStatus(gl.FRAMEBUFFER) != gl.FRAMEBUFFER_COMPLETE {
err = fmt.Errorf("Framebuffer could not be set up")
return
}
fb = &Framebuffer{
Buffer: buffer,
Texture: texture,
Width: w,
Height: h,
}
return
}
func createTexture(r io.Reader) (gl.Texture, error) {
img, err := png.Decode(r)
if err != nil {
return gl.Texture(0), err
}
rgbaImg, ok := img.(*image.NRGBA)
if !ok {
return gl.Texture(0), errors.New("texture must be an NRGBA image")
}
textureId := gl.GenTexture()
textureId.Bind(gl.TEXTURE_2D)
gl.TexParameterf(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.LINEAR)
gl.TexParameterf(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR)
// flip image: first pixel is lower left corner
imgWidth, imgHeight := img.Bounds().Dx(), img.Bounds().Dy()
data := make([]byte, imgWidth*imgHeight*4)
lineLen := imgWidth * 4
dest := len(data) - lineLen
for src := 0; src < len(rgbaImg.Pix); src += rgbaImg.Stride {
copy(data[dest:dest+lineLen], rgbaImg.Pix[src:src+rgbaImg.Stride])
dest -= lineLen
}
gl.TexImage2D(gl.TEXTURE_2D, 0, 4, imgWidth, imgHeight, 0, gl.RGBA, gl.UNSIGNED_BYTE, data)
return textureId, nil
}
func imageAlpha(pix []byte, width, height int) (*Sampler2D, error) {
s := &Sampler2D{
tex: gl.GenTexture(),
}
s.bind()
gl.TexParameterf(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.LINEAR)
gl.TexParameterf(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR)
gl.TexImage2D(gl.TEXTURE_2D, 0, gl.R8, width, height, 0, gl.RED, gl.UNSIGNED_BYTE, pix)
return s, nil
}
// Create a new texture, initialize it to have a `gl.LINEAR` filter and use
// `gl.CLAMP_TO_EDGE`.
func NewTexture(w, h int) *Texture {
texture := &Texture{gl.GenTexture(), w, h}
With(texture, func() {
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.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_R, gl.CLAMP_TO_EDGE)
})
return texture
}
func (rm *ResourceManager) loadTile(name string) (*Bitmap, bool) {
fname, _ := filepath.Abs(path.Join("resources", name))
var tex gl.Texture
allegro.RunInThread(func() {
tex = gl.GenTexture()
tex.Bind(gl.TEXTURE_2D)
glfw.LoadTexture2D(fname, 0)
})
bmp := Bitmap{tex, 0, 0, DEFAULT_TILE_WIDTH, DEFAULT_TILE_HEIGHT}
rm.tileBmps[name] = bmp
return &bmp, true
}
func getGLTexture(img image.Image, smoothing int) (gltexture gl.Texture, err error) {
var data *bytes.Buffer
if data, err = encodeTGA("texture", img); err != nil {
return
}
gltexture = gl.GenTexture()
gltexture.Bind(gl.TEXTURE_2D)
if !glfw.LoadMemoryTexture2D(data.Bytes(), 0) {
err = fmt.Errorf("Failed to load texture")
return
}
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, smoothing)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, smoothing)
return
}
func MakeTextureFromTGA(fname string) gl.Texture {
tex := gl.GenTexture()
tex.Bind(gl.TEXTURE_2D)
glfw.LoadTexture2D(fname, 0)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.REPEAT)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.REPEAT)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.LINEAR)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR_MIPMAP_LINEAR)
gl.GenerateMipmap(gl.TEXTURE_2D)
// glh.OpenGLSentinel() // check for errors
return tex
}
func (self *OpenGLRenderer) LoadTexture(texture *render.Texture) gl.Texture {
glTexture := gl.GenTexture()
glTexture.Bind(gl.TEXTURE_2D)
defer glTexture.Unbind(gl.TEXTURE_2D)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.REPEAT)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.REPEAT)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.LINEAR)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR_MIPMAP_LINEAR)
self.glTexImage2D(gl.TEXTURE_2D, texture)
gl.GenerateMipmap(gl.TEXTURE_2D)
return glTexture
}
func initTexture2(filename string) gl.Texture {
img, err := glfw.ReadImage(filename+".tga", glfw.NoRescaleBit)
if err != nil {
panic(err)
}
rt := gl.GenTexture()
gl.Enable(gl.TEXTURE_2D)
rt.Bind(gl.TEXTURE_2D)
gl.TexEnvf(gl.TEXTURE_ENV, gl.TEXTURE_ENV_MODE, gl.MODULATE)
gl.TexParameterf(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.NEAREST)
gl.TexParameterf(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.NEAREST)
// gl.TexParameterf(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.REPEAT)
// gl.TexParameterf(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.REPEAT)
gl.TexImage2D(gl.TEXTURE_2D, 0, gl.RGBA, img.Width(), img.Height(), 0, gl.RGBA, gl.UNSIGNED_BYTE, img.Data())
fmt.Println(filename, img.Width(), img.Height())
return rt
}
func (v *Video) Init(t <-chan []uint32, ft chan bool, n string) chan [2]int {
v.tick = t
v.frametick = ft
v.resize = make(chan [2]int)
if sdl.Init(sdl.INIT_VIDEO|sdl.INIT_JOYSTICK|sdl.INIT_AUDIO) != 0 {
log.Fatal(sdl.GetError())
}
v.screen = sdl.SetVideoMode(512, 480, 32, sdl.OPENGL|sdl.RESIZABLE)
if v.screen == nil {
log.Fatal(sdl.GetError())
}
sdl.WM_SetCaption(fmt.Sprintf("Fergulator - %s", n), "")
if gl.Init() != 0 {
panic(sdl.GetError())
}
gl.Enable(gl.TEXTURE_2D)
v.Reshape(int(v.screen.W), int(v.screen.H))
v.tex = gl.GenTexture()
joy = make([]*sdl.Joystick, sdl.NumJoysticks())
for i := 0; i < sdl.NumJoysticks(); i++ {
joy[i] = sdl.JoystickOpen(i)
fmt.Println("-----------------")
if joy[i] != nil {
fmt.Printf("Joystick %d\n", i)
fmt.Println(" Name: ", sdl.JoystickName(0))
fmt.Println(" Number of Axes: ", joy[i].NumAxes())
fmt.Println(" Number of Buttons: ", joy[i].NumButtons())
fmt.Println(" Number of Balls: ", joy[i].NumBalls())
} else {
fmt.Println(" Couldn't open Joystick!")
}
}
return v.resize
}
func uploadTexture_RGBA32(w, h int, data []byte) gl.Texture {
id := gl.GenTexture()
id.Bind(gl.TEXTURE_2D)
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.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_R, gl.CLAMP_TO_EDGE)
gl.TexImage2D(gl.TEXTURE_2D, 0, gl.RGBA, int(w), int(h), 0, gl.RGBA, gl.UNSIGNED_BYTE, data)
if gl.GetError() != gl.NO_ERROR {
id.Delete()
panic("Failed to load a texture")
return 0
}
return id
}
func CreateTexture(img image.Image) (*Texture, error) {
imgW, imgH := img.Bounds().Dx(), img.Bounds().Dy()
imgDim := Vector2{float32(imgW), float32(imgH)}
rgbaImg, ok := img.(*image.NRGBA)
if !ok {
return nil, errors.New("texture must be an NRGBA image")
}
textureId := gl.GenTexture()
textureId.Bind(gl.TEXTURE_2D)
gl.TexParameterf(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.NEAREST)
gl.TexParameterf(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.NEAREST)
gl.TexImage2D(gl.TEXTURE_2D, 0, 4, imgW, imgH, 0, gl.RGBA, gl.UNSIGNED_BYTE, rgbaImg.Pix)
return &Texture{textureId, imgDim, false, false, false, nextTextureCacheId()}, nil
}
func NewTextureEmpty(width int, height int, model color.Model) *Texture {
internalFormat, typ, format, target, e := ColorModelToGLTypes(model)
if e != nil {
return nil
}
a := gl.GenTexture()
a.Bind(target)
gl.TexImage2D(target, 0, internalFormat, width, height, 0, typ, format, nil)
t := &Texture{a, false, nil, format, typ, internalFormat, target, width, height}
t.SetWraping(WrapS, ClampToEdge)
t.SetWraping(WrapT, ClampToEdge)
t.SetFiltering(Nearest, Nearest)
ResourceManager.Add(t)
return t
}
// NewAtlas creates a new texture atlas.
//
// The given width, height and depth determine the size and depth of
// the underlying texture.
//
// depth should be 1, 3 or 4 and it will specify if the texture is
// created with Alpha, RGB or RGBA channels.
// The image data supplied through Atlas.Set() should be of the same format.
func NewTextureAtlas(width, height, depth int) *TextureAtlas {
switch depth {
case 1, 3, 4:
default:
panic("Invalid depth value")
}
a := new(TextureAtlas)
a.width = width
a.height = height
a.depth = depth
a.used = 0
a.data = make([]byte, width*height*depth)
// We want a one pixel border around the whole atlas to avoid
// any artefacts when sampling our texture.
a.nodes = append(a.nodes, atlasNode{1, 1, width - 2})
a.texture = gl.GenTexture()
return a
}
func initTexture(filename string, width, height int) gl.Texture {
file, err := os.Open(filename + ".png")
if err != nil {
panic(err)
}
defer file.Close()
img, _, err := image.Decode(file)
if err != nil {
panic(err)
}
t := reflect.ValueOf(img)
fmt.Println(t.Elem().Type().Name())
canvas := image.NewRGBA(image.Rect(0, 0, width, height))
for y := 0; y < height; y++ {
for x := 0; x < width; x++ {
r, g, b, a := img.At(x, y).RGBA()
if (filename == "hex4v" || filename == "hexstar2" || filename == "hexborder") && r == 0 && g == 0 && b == 0 {
a = 0
}
// if filename == "hex5k" {
// fmt.Println(r, g, b, a)
// }
base := 4*x + canvas.Stride*y
canvas.Pix[base] = uint8(r)
canvas.Pix[base+1] = uint8(g)
canvas.Pix[base+2] = uint8(b)
canvas.Pix[base+3] = uint8(a)
}
}
rt := gl.GenTexture()
gl.Enable(gl.TEXTURE_2D)
rt.Bind(gl.TEXTURE_2D)
gl.TexEnvf(gl.TEXTURE_ENV, gl.TEXTURE_ENV_MODE, gl.MODULATE)
gl.TexParameterf(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.NEAREST)
gl.TexParameterf(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.NEAREST)
// gl.TexParameterf(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.REPEAT)
// gl.TexParameterf(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.REPEAT)
gl.TexImage2D(gl.TEXTURE_2D, 0, gl.RGBA, width, height, 0, gl.RGBA, gl.UNSIGNED_BYTE, canvas.Pix)
return rt
}
func (self *OpenGLRenderer) loadCubeMap(material *render.Material) gl.Texture {
glTexture := gl.GenTexture()
glTexture.Bind(gl.TEXTURE_CUBE_MAP)
defer glTexture.Unbind(gl.TEXTURE_CUBE_MAP)
gl.TexParameteri(gl.TEXTURE_CUBE_MAP, gl.TEXTURE_MAG_FILTER, gl.NEAREST)
gl.TexParameteri(gl.TEXTURE_CUBE_MAP, gl.TEXTURE_MIN_FILTER, gl.NEAREST)
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)
self.glTexImage2D(gl.TEXTURE_CUBE_MAP_POSITIVE_X, material.CubeMap[render.CubeFace_Right])
self.glTexImage2D(gl.TEXTURE_CUBE_MAP_NEGATIVE_X, material.CubeMap[render.CubeFace_Left])
self.glTexImage2D(gl.TEXTURE_CUBE_MAP_POSITIVE_Y, material.CubeMap[render.CubeFace_Top])
self.glTexImage2D(gl.TEXTURE_CUBE_MAP_NEGATIVE_Y, material.CubeMap[render.CubeFace_Bottom])
self.glTexImage2D(gl.TEXTURE_CUBE_MAP_POSITIVE_Z, material.CubeMap[render.CubeFace_Front])
self.glTexImage2D(gl.TEXTURE_CUBE_MAP_NEGATIVE_Z, material.CubeMap[render.CubeFace_Back])
return glTexture
}
// Packs image into a texture of size * size dimensions
func (i *ImagePacker) pack(size int) (SpriteSheet, error) {
rootNode := newNode(size, size)
for v, img := range i.images {
err := rootNode.recInsert(img.w, img.h, v)
if err != nil {
return SpriteSheet{}, err
}
}
nodeImage := image.NewRGBA(image.Rect(0, 0, size, size))
traverseNodes(rootNode, func(nd node) {
draw.Draw(nodeImage, image.Rect(nd.rc.left, nd.rc.top, nd.rc.right, nd.rc.bottom), i.images[nd.id].image, image.ZP, draw.Src)
i.sprites[nd.id].left = float32(nd.rc.left) / float32(size)
i.sprites[nd.id].top = float32(nd.rc.bottom) / float32(size)
i.sprites[nd.id].right = float32(nd.rc.right) / float32(size)
i.sprites[nd.id].bottom = float32(nd.rc.top) / float32(size)
i.sprites[nd.id].W = float32(nd.rc.right - nd.rc.left)
i.sprites[nd.id].H = float32(nd.rc.bottom - nd.rc.top)
})
texture := gl.GenTexture()
texture.Bind(gl.TEXTURE_2D)
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, size, size, 0, gl.RGBA, gl.UNSIGNED_BYTE, nodeImage.Pix)
texture.Unbind(gl.TEXTURE_2D)
spriteSheet := NewSpriteSheet(texture, size, size)
return spriteSheet, nil
}
// bind the given atlas to the current GL context
//
// the current implementation is very stupid, since it will
// upload the texture every single call.
//
// later, improve this to upload only if there is a real need for it
func (a *Atlas) bind() error {
// discard any possible error
if err := checkGlError(); err != nil {
return err
}
if gl.Object(a.gltex).IsTexture() {
a.gltex = gl.GenTexture()
}
a.gltex.Bind(gl.TEXTURE_2D)
gl.TexImage2D(gl.TEXTURE_2D, 0, gl.RGBA, a.data.Bounds().Dx(), a.data.Bounds().Dy(), 0, gl.RGBA, gl.UNSIGNED_BYTE, a.data.Pix)
if err := checkGlError(gl.OUT_OF_MEMORY, gl.INVALID_OPERATION); err != nil {
return err
}
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.REPEAT)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.REPEAT)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.LINEAR)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR_MIPMAP_LINEAR)
gl.GenerateMipmap(gl.TEXTURE_2D)
panicGlError()
return nil
}
func (video *SDLVideo) initGL() {
if gl.Init() != 0 {
panic(sdl.GetError())
}
gl.ClearColor(0.0, 0.0, 0.0, 1.0)
gl.Enable(gl.CULL_FACE)
gl.Enable(gl.DEPTH_TEST)
video.prog = createProgram(vertShaderSrcDef, fragShaderSrcDef)
posAttrib := video.prog.GetAttribLocation("vPosition")
texCoordAttr := video.prog.GetAttribLocation("vTexCoord")
video.textureUni = video.prog.GetAttribLocation("texture")
video.texture = gl.GenTexture()
gl.ActiveTexture(gl.TEXTURE0)
video.texture.Bind(gl.TEXTURE_2D)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.NEAREST)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.NEAREST)
video.prog.Use()
posAttrib.EnableArray()
texCoordAttr.EnableArray()
vertVBO := gl.GenBuffer()
vertVBO.Bind(gl.ARRAY_BUFFER)
verts := []float32{-1.0, 1.0, -1.0, -1.0, 1.0, -1.0, 1.0, -1.0, 1.0, 1.0, -1.0, 1.0}
gl.BufferData(gl.ARRAY_BUFFER, len(verts)*int(unsafe.Sizeof(verts[0])), &verts[0], gl.STATIC_DRAW)
textCoorBuf := gl.GenBuffer()
textCoorBuf.Bind(gl.ARRAY_BUFFER)
texVerts := []float32{0.0, 1.0, 0.0, 0.0, 1.0, 0.0, 1.0, 0.0, 1.0, 1.0, 0.0, 1.0}
gl.BufferData(gl.ARRAY_BUFFER, len(texVerts)*int(unsafe.Sizeof(texVerts[0])), &texVerts[0], gl.STATIC_DRAW)
posAttrib.AttribPointer(2, gl.FLOAT, false, 0, uintptr(0))
texCoordAttr.AttribPointer(2, gl.FLOAT, false, 0, uintptr(0))
}
func LoadTexture(filename string) gl.Texture {
r, err := os.Open(filename)
if err != nil {
fmt.Fprintf(os.Stderr, "[e] %v\n", err)
return 0
}
defer r.Close()
img, _, err := image.Decode(r)
if err != nil {
fmt.Fprintf(os.Stderr, "[e] %v\n", err)
return 0
}
// lazy way to ensure we have the correct image format for opengl
rgbaImg := image.NewNRGBA(img.Bounds())
draw.Draw(rgbaImg, img.Bounds(), img, image.ZP, draw.Src)
tex := gl.GenTexture()
tex.Bind(gl.TEXTURE_2D)
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)
// flip image: first pixel is lower left corner
w, h := img.Bounds().Dx(), img.Bounds().Dy()
data := make([]byte, w*h*4)
lineLen := w * 4
dest := len(data) - lineLen
for src := 0; src < len(rgbaImg.Pix); src += rgbaImg.Stride {
copy(data[dest:dest+lineLen], rgbaImg.Pix[src:src+rgbaImg.Stride])
dest -= lineLen
}
gl.TexImage2D(gl.TEXTURE_2D, 0, gl.RGBA, w, h, 0, gl.RGBA, gl.UNSIGNED_BYTE, data)
return tex
}
func NewTexture2(data interface{}, width int, height int, target gl.GLenum, internalFormat int, typ gl.GLenum, format gl.GLenum) *Texture {
a := gl.GenTexture()
a.Bind(target)
gl.TexImage2D(target, 0, internalFormat, width, height, 0, typ, format, data)
t := &Texture{a, false, data, format, typ, internalFormat, target, width, height}
t.SetWraping(WrapS, ClampToEdge)
t.SetWraping(WrapT, ClampToEdge)
t.SetFiltering(Nearest, Nearest)
//ansi := []float32{0}
//gl.GetFloatv(gl.MAX_TEXTURE_MAX_ANISOTROPY_EXT, ansi)
//gl.TexParameterf(target, gl.TEXTURE_MAX_ANISOTROPY_EXT, ansi[0])
t.PreloadRender() //Forcing texture to go to VRAM and prevent shuttering
t.data = nil
data = nil
ResourceManager.Add(t)
return t
}
func main() {
b, _ := ioutil.ReadFile("./roboto/roboto-light.ttf")
font, ferr := tt.Parse(b)
if ferr != nil {
fmt.Println("can't parse font %v , len %v", ferr.Error(), len(b))
}
fc := ft.NewContext()
fc.SetFont(font)
glfw.SetErrorCallback(errorCallback)
if !glfw.Init() {
panic("Can't init glfw!")
}
defer glfw.Terminate()
window, err := glfw.CreateWindow(800, 600, "Testing", nil, nil)
if err != nil {
panic(err)
}
window.MakeContextCurrent()
gl.Init()
program := gl.CreateProgram()
vertexShader := gl.CreateShader(gl.VERTEX_SHADER)
vertexShader.Source(`
attribute vec4 a_position;
attribute vec2 a_coord;
varying vec2 v_coord;
void main() {
gl_Position = a_position;
v_coord = a_coord;
}
`)
vertexShader.Compile()
fmt.Printf("vertex: %v\n", vertexShader.GetInfoLog())
fragmentShader := gl.CreateShader(gl.FRAGMENT_SHADER)
fragmentShader.Source(`
varying vec2 v_coord;
uniform sampler2D s_picture;
uniform vec4 color;
uniform bool has_picture;
void main() {
if(has_picture) {
gl_FragColor = texture2D(s_picture, v_coord);
} else {
gl_FragColor = color;
}
}
`)
fragmentShader.Compile()
fmt.Printf("fragment %v \n", fragmentShader.GetInfoLog())
program.AttachShader(vertexShader)
program.AttachShader(fragmentShader)
program.Link()
// ini
//gl.MatrixMode(gl.PROJECTION)
//gl.Ortho(0, 640, 0, 480, 0, 1)
gl.ClearColor(0.5, 0.5, 0.5, 0.0)
root := widget.Widget{
Name: "Red",
Rect: image.Rect(0, 0, 800, 600),
Background: color.RGBA{255, 128, 128, 126},
OnClick: widget.ClickInner,
OnDrag: widget.DragInner,
OnHover: widget.HoverInner,
OnResize: widget.ResizeItself,
}
blue := root.AddWidget(&widget.Widget{
Name: "Blue",
Rect: image.Rect(100, 100, 200, 200),
Image: LoadImage("./test.png"),
Background: color.RGBA{128, 128, 255, 126},
OnClick: func(w *widget.Widget, p image.Point) {
root.SetTop(w)
fmt.Println("Clicked blue box")
widget.ClickInner(w, p)
},
OnDrag: func(w *widget.Widget, p image.Point, d image.Point) bool {
widget.DragInner(w, p, d)
widget.DragItself(w, p, d)
return true
},
OnResize: widget.ResizeItself,
})
blue.AddWidget(&widget.Widget{
Name: "White",
Rect: image.Rect(90, 90, 100, 100),
Background: color.RGBA{250, 250, 250, 250},
OnDrag: func(w *widget.Widget, p image.Point, d image.Point) bool {
widget.DragItself(w, p, d)
blue.Resize(d)
return true
},
})
root.AddWidget(&widget.Widget{
Name: "Green",
Rect: image.Rect(100, 300, 200, 400),
Background: color.RGBA{128, 255, 128, 126},
OnClick: func(w *widget.Widget, p image.Point) {
root.SetTop(w)
w.Image = LoadImage("./test2.png")
},
OnDrag: widget.DragItself,
})
root.AddWidget(&widget.Widget{
Name: "Black",
Rect: image.Rect(100, 400, 150, 450),
Background: color.RGBA{0, 0, 0, 126},
OnHover: func(w *widget.Widget, p0 image.Point, p1 image.Point) {
if p1.In(w.Rect) {
w.Background = color.RGBA{255, 255, 255, 126}
} else {
w.Background = color.RGBA{0, 0, 0, 126}
}
},
})
white := root.AddWidget(&widget.Widget{
Name: "White",
Text: "Меня зовут Светлана, я из города Иваново. «Единая Россия» очень много сделала достижений: они подняли экономик… экономику, мы стали более лучшие… одеваться, и не было того что щас — это очень большие достижения! В сельском хозяйстве очень хорошо. (Гладин: Что именно в сельском хозяйстве они сделали?) Стало больше… земель за-а… много, ну… я не знаю даже как сказать… засеивать больше земель… а-а-а вот, овощи там, рожь — вот это всё. Что еще сказать… Так как у нас страна многонациональная, у нас в Москве очень много людей, которые очень помогают нам… с других городов… (вопрос Гладина: Вы считаете это достижение «Единой России»?) Да, это большое достижение! Очень хорошее даже! Видите ну… да… Видите ну у нас в Иванове очень хорошая стала медицина… а…что ещё… благоустройство в городах хорошее… с жильём… никаких проблем. Люди подмогают очень хорошо",
Rect: image.Rect(400, 200, 700, 500),
Foreground: color.RGBA{0, 0, 0, 0},
Background: color.RGBA{255, 255, 255, 126},
OnDrag: func(w *widget.Widget, p image.Point, d image.Point) bool {
root.SetTop(w)
widget.DragInner(w, p, d)
widget.DragItself(w, p, d)
return true
},
OnResize: widget.ResizeItself,
Padding: image.Rect(20, 20, 20, 20),
})
white.AddWidget(&widget.Widget{
Name: "White",
Rect: image.Rect(290, 290, 300, 300),
Background: color.RGBA{0, 0, 0, 250},
OnDrag: func(w *widget.Widget, p image.Point, d image.Point) bool {
widget.DragItself(w, p, d)
white.Resize(d)
return true
},
})
x0 := 0.0
y0 := 0.0
window.SetMouseButtonCallback(func(w *glfw.Window, but glfw.MouseButton, act glfw.Action, key glfw.ModifierKey) {
xpos, ypos := w.GetCursorPosition()
if act == glfw.Press {
root.Click(image.Point{X: int(xpos), Y: int(ypos)})
x0, y0 = xpos, ypos
}
})
window.SetCursorPositionCallback(func(w *glfw.Window, xpos float64, ypos float64) {
root.Hover(image.Point{X: int(x0), Y: int(y0)}, image.Point{X: int(xpos), Y: int(ypos)})
if w.GetMouseButton(glfw.MouseButtonLeft) == glfw.Press {
root.Drag(image.Point{X: int(x0), Y: int(y0)}, image.Point{X: int(xpos - x0), Y: int(ypos - y0)})
x0, y0 = xpos, ypos
}
x0, y0 = xpos, ypos
})
width0, height0 := window.GetSize()
window.SetSizeCallback(func(w *glfw.Window, width int, height int) {
gl.Viewport(0, 0, width, height)
root.Rect.Max = image.Point{width, height}
width0, height0 = width, height
})
/*switch(color_type){
case PNG_COLOR_TYPE_GRAY:
return GL_LUMINANCE;
case PNG_COLOR_TYPE_GRAY_ALPHA:
return GL_LUMINANCE_ALPHA;
case PNG_COLOR_TYPE_RGB:
return GL_RGB;
case PNG_COLOR_TYPE_RGB_ALPHA:
return GL_RGBA;
*/
/*
here init texture pool
texturePool := make([widget.Widget]texture)
*/
for !window.ShouldClose() {
//Do OpenGL stuff
program.Use()
gl.Clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT)
root.DrawBy(image.Point{}, func(w *widget.Widget, corner image.Point) {
var texture gl.Texture
if w.Image != nil {
texture = gl.GenTexture()
texture.Bind(gl.TEXTURE_2D)
gl.ActiveTexture(gl.TEXTURE0)
gl.TexImage2D(gl.TEXTURE_2D, 0, gl.RGBA,
w.Image.Rect.Dx(), w.Image.Rect.Dy(),
0, gl.RGBA, gl.UNSIGNED_BYTE, w.Image.Pix)
}
leftX := 2.0*float32(corner.X+w.Rect.Min.X)/float32(root.Rect.Dx()) - 1.0
leftY := 1.0 - 2.0*float32(corner.Y+w.Rect.Min.Y)/float32(root.Rect.Dy())
rightX := 2.0*float32(corner.X+w.Rect.Min.X)/float32(root.Rect.Dx()) - 1.0
rightY := 1.0 - 2.0*float32(corner.Y+w.Rect.Max.Y)/float32(root.Rect.Dy())
bottomX := 2.0*float32(corner.X+w.Rect.Max.X)/float32(root.Rect.Dx()) - 1.0
bottomY := 1.0 - 2.0*float32(corner.Y+w.Rect.Min.Y)/float32(root.Rect.Dy())
topX := 2.0*float32(corner.X+w.Rect.Max.X)/float32(root.Rect.Dx()) - 1.0
topY := 1.0 - 2.0*float32(corner.Y+w.Rect.Max.Y)/float32(root.Rect.Dy())
vertices := []float32{
leftX, leftY,
rightX, rightY,
bottomX, bottomY,
topX, topY,
}
texturePoints := []float32{
0.0, 0.0, 0.0, 1.0,
1.0, 0.0, 1.0, 1.0,
}
s_picture := program.GetUniformLocation("s_picture")
s_picture.Uniform1i(0)
has_picture := program.GetUniformLocation("has_picture")
if w.Image != nil {
has_picture.Uniform1i(1)
} else {
has_picture.Uniform1i(0)
}
col := program.GetUniformLocation("color")
r, g, b, a := w.Background.RGBA()
col.Uniform4f(float32(r)/float32(0xFFFF), float32(g)/float32(0xFFFF), float32(b)/float32(0xFFFF), float32(a)/float32(0xFFFF))
gl.PixelStorei(gl.UNPACK_ALIGNMENT, gl.UNSIGNED_BYTE)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.NEAREST)
a_position := program.GetAttribLocation("a_position")
a_position.AttribPointer(2, gl.FLOAT, false, 0, vertices)
a_position.EnableArray()
a_coord := program.GetAttribLocation("a_coord")
a_coord.AttribPointer(2, gl.FLOAT, false, 0, texturePoints)
a_coord.EnableArray()
gl.DrawArrays(gl.TRIANGLE_STRIP, 0, 4)
gl.Flush()
texture.Delete()
if len(w.Text) > 0 {
rct := w.Rect
rct.Max = rct.Max.Sub(w.Rect.Min)
rct.Min = rct.Min.Sub(w.Rect.Min)
fg := image.NewRGBA(rct)
fgu := image.NewUniform(color.RGBA{0, 16, 32, 255})
draw.Draw(fg, fg.Bounds(), fgu, image.ZP, draw.Src)
bg := image.NewRGBA(rct)
bgu := image.NewUniform(color.RGBA{255, 255, 255, 255})
draw.Draw(bg, bg.Bounds(), bgu, image.ZP, draw.Src)
lineHeight := 20.0
fc.SetDPI(100.0)
fc.SetFont(font)
fc.SetFontSize(12.0)
fc.SetClip(bg.Bounds())
fc.SetDst(bg)
fc.SetSrc(fg)
p0 := ft.Pt(w.Padding.Min.X, w.Padding.Min.Y)
p := p0
for _, s := range w.Text {
p, _ = fc.DrawString(string(s), p)
if int(p.X>>8) > rct.Max.X-w.Padding.Max.X-w.Padding.Min.X {
p.X = p0.X
p.Y += raster.Fix32(lineHeight * 256)
}
}
var texture gl.Texture
if bg != nil {
texture = gl.GenTexture()
texture.Bind(gl.TEXTURE_2D)
gl.ActiveTexture(gl.TEXTURE0)
gl.TexImage2D(gl.TEXTURE_2D, 0, gl.RGBA,
bg.Rect.Dx(), bg.Rect.Dy(),
0, gl.RGBA, gl.UNSIGNED_BYTE, bg.Pix)
}
leftX := 2.0*float32(corner.X+w.Rect.Min.X)/float32(root.Rect.Dx()) - 1.0
leftY := 1.0 - 2.0*float32(corner.Y+w.Rect.Min.Y)/float32(root.Rect.Dy())
rightX := 2.0*float32(corner.X+w.Rect.Min.X)/float32(root.Rect.Dx()) - 1.0
rightY := 1.0 - 2.0*float32(corner.Y+w.Rect.Max.Y)/float32(root.Rect.Dy())
bottomX := 2.0*float32(corner.X+w.Rect.Max.X)/float32(root.Rect.Dx()) - 1.0
bottomY := 1.0 - 2.0*float32(corner.Y+w.Rect.Min.Y)/float32(root.Rect.Dy())
topX := 2.0*float32(corner.X+w.Rect.Max.X)/float32(root.Rect.Dx()) - 1.0
topY := 1.0 - 2.0*float32(corner.Y+w.Rect.Max.Y)/float32(root.Rect.Dy())
vertices := []float32{
leftX, leftY,
rightX, rightY,
bottomX, bottomY,
topX, topY,
}
texturePoints := []float32{
0.0, 0.0, 0.0, 1.0,
1.0, 0.0, 1.0, 1.0,
}
s_picture := program.GetUniformLocation("s_picture")
s_picture.Uniform1i(0)
has_picture := program.GetUniformLocation("has_picture")
if bg != nil {
has_picture.Uniform1i(1)
} else {
has_picture.Uniform1i(0)
}
col := program.GetUniformLocation("color")
r, g, b, a := w.Background.RGBA()
col.Uniform4f(float32(r)/float32(0xFFFF), float32(g)/float32(0xFFFF), float32(b)/float32(0xFFFF), float32(a)/float32(0xFFFF))
gl.PixelStorei(gl.UNPACK_ALIGNMENT, gl.UNSIGNED_BYTE)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.NEAREST)
a_position := program.GetAttribLocation("a_position")
a_position.AttribPointer(2, gl.FLOAT, false, 0, vertices)
a_position.EnableArray()
a_coord := program.GetAttribLocation("a_coord")
a_coord.AttribPointer(2, gl.FLOAT, false, 0, texturePoints)
a_coord.EnableArray()
gl.DrawArrays(gl.TRIANGLE_STRIP, 0, 4)
gl.Flush()
texture.Delete()
}
})
window.SwapBuffers()
glfw.PollEvents()
}
}
func LoadSkybox() {
gl.ActiveTexture(gl.TEXTURE0)
if err := CheckGlError(); err != nil {
panic(err)
}
t := gl.GenTexture()
if err := CheckGlError(); err != nil {
panic(err)
}
t.Bind(gl.TEXTURE_CUBE_MAP)
if err := CheckGlError(); err != nil {
panic(err)
}
const filename = "Skybox_tut13_384x256.png"
img, err := LoadImage(filename)
if err != nil {
panic(err)
}
size := img.Bounds().Size()
w := size.X
h := size.Y
if w/3 != h/2 {
panic("incorrect aspect ratio")
}
s := h / 2 // Size of one face of the cube.
targets := [...]gl.GLenum{
gl.TEXTURE_CUBE_MAP_NEGATIVE_X,
gl.TEXTURE_CUBE_MAP_POSITIVE_X,
gl.TEXTURE_CUBE_MAP_NEGATIVE_Y,
gl.TEXTURE_CUBE_MAP_POSITIVE_Y,
gl.TEXTURE_CUBE_MAP_NEGATIVE_Z,
gl.TEXTURE_CUBE_MAP_POSITIVE_Z,
}
rs := []image.Rectangle{
image.Rect(0*s, 0*s, 1*s, 1*s), // 0 side.
image.Rect(1*s, 0*s, 2*s, 1*s), // 1 side.
image.Rect(2*s, 0*s, 3*s, 1*s), // 2 side.
image.Rect(0*s, 1*s, 1*s, 2*s), // 3 bottom.
image.Rect(1*s, 1*s, 2*s, 2*s), // 4 top.
image.Rect(2*s, 1*s, 3*s, 2*s), // 5 side.
}
// redirect must end with 3 and 4. This places the floor at -z and the
// sky at +z.
// All the sides look properly oriented (grass down) on the +y side.
// Considering that the sky is properly oriented the way it is, then
// rectangle 5 contains the picture that matches it on the +y side.
// Therefore, redirect must end with 5, 3, 4.
// Problem now: all the other sides, and maybe the floor too, need to be
// rotated in order to line up, that is having their sky on top.
redirect := [...]int{0, 2, 1, 5, 3, 4}
ID := matrix23{1, 0, 0, 1, 0, 0}
ms := [...]matrix23{
matrix23{0, -1, 1, 0, 0, s - 1},
matrix23{0, 1, -1, 0, s - 1, 0},
matrix23{-1, 0, 0, -1, s - 1, s - 1},
ID,
matrix23{-1, 0, 0, -1, s - 1, s - 1},
ID,
}
rgba := forceRGBA(img)
for i, target := range targets {
subimage := rgba.SubImage(rs[redirect[i]])
data := GlRgba(subimage, ms[i])
gl.TexImage2D(
target,
0, // Mipmap level.
gl.SRGB8_ALPHA8, // Format inside OpenGL.
s, // Width.
s, // Height.
0, // Border. Doc says it must be 0.
gl.RGBA, // Format of the data that...
gl.UNSIGNED_BYTE, // ... I give to OpenGL.
data, // And the data itself.
)
if err := CheckGlError(); err != nil {
panic(err)
}
}
const target = gl.TEXTURE_CUBE_MAP
gl.GenerateMipmap(target)
if err := CheckGlError(); err != nil {
panic(err)
}
gl.TexParameteri(target, gl.TEXTURE_MIN_FILTER, gl.LINEAR_MIPMAP_LINEAR)
if err := CheckGlError(); err != nil {
panic(err)
}
gl.TexParameteri(target, gl.TEXTURE_MAG_FILTER, gl.LINEAR)
if err := CheckGlError(); err != nil {
panic(err)
}
gl.TexParameteri(target, gl.TEXTURE_WRAP_R, gl.CLAMP_TO_EDGE)
if err := CheckGlError(); err != nil {
panic(err)
}
gl.TexParameteri(target, gl.TEXTURE_WRAP_S, gl.CLAMP_TO_EDGE)
if err := CheckGlError(); err != nil {
panic(err)
}
gl.TexParameteri(target, gl.TEXTURE_WRAP_T, gl.CLAMP_TO_EDGE)
if err := CheckGlError(); err != nil {
panic(err)
}
t.Unbind(target)
globaltexture = t
}
func LoadTexture() {
gl.ActiveTexture(gl.TEXTURE0)
if err := CheckGlError(); err != nil {
panic(err)
}
t := gl.GenTexture()
if err := CheckGlError(); err != nil {
panic(err)
}
const target = gl.TEXTURE_2D
t.Bind(target)
if err := CheckGlError(); err != nil {
panic(err)
}
img, err := LoadImage("test.jpg")
if err != nil {
panic(err)
}
data := GlRgba(img, matrix23{1, 0, 0, 1, 0, 0})
size := img.Bounds().Size()
gl.TexImage2D(
target,
0, // Mipmap level.
gl.SRGB8_ALPHA8, // Format inside OpenGL.
size.X, // Width.
size.Y, // Height.
0, // Border. Doc says it must be 0.
gl.RGBA, // Format of the data that...
gl.UNSIGNED_BYTE, // ... I give to OpenGL.
data, // And the data itself.
)
if err := CheckGlError(); err != nil {
panic(err)
}
gl.GenerateMipmap(target)
if err := CheckGlError(); err != nil {
panic(err)
}
gl.TexParameteri(target, gl.TEXTURE_MIN_FILTER, gl.LINEAR_MIPMAP_LINEAR)
if err := CheckGlError(); err != nil {
panic(err)
}
gl.TexParameteri(target, gl.TEXTURE_MAG_FILTER, gl.LINEAR)
if err := CheckGlError(); err != nil {
panic(err)
}
gl.TexParameteri(target, gl.TEXTURE_WRAP_R, gl.CLAMP_TO_EDGE)
if err := CheckGlError(); err != nil {
panic(err)
}
gl.TexParameteri(target, gl.TEXTURE_WRAP_S, gl.CLAMP_TO_EDGE)
if err := CheckGlError(); err != nil {
panic(err)
}
t.Unbind(target)
globaltexture = t
}
func TextureFromDDS(fname string) (gl.Texture, error) {
file, err := os.Open(fname)
if err != nil {
return gl.Texture(0), fmt.Errorf("Cannot open DDS file: %v", err)
}
defer file.Close()
var filecode [4]byte
binary.Read(file, binary.LittleEndian, &filecode) // DDS is always Little Endian encoded
if string(filecode[:]) != "DDS " {
return gl.Texture(0), fmt.Errorf("File code is not DDS, instead got %v.", string(filecode[:]))
}
header := ddsHeader{}
err = binary.Read(file, binary.LittleEndian, &header)
if err != nil {
return gl.Texture(0), fmt.Errorf("Couldn't read DDS header: %v", err)
}
stat, err := file.Stat()
if err != nil {
return gl.Texture(0), fmt.Errorf("Couldn't get size of file: %v", err)
}
// All of the file after the header and file identifier "DDS "
// is images. 4 byte identifier + 124 byte header = 128 bytes
// to take off the file size.
bufSize := stat.Size() - 128
buffer := make([]byte, bufSize)
err = binary.Read(file, binary.LittleEndian, buffer)
if err != nil {
return gl.Texture(0), fmt.Errorf("Couldn't read all mipmaps into buffer: %v", err)
}
//var components uint32
var blockSize uint32
var format gl.GLenum
switch header.PixelFormat.FourCC {
case fourCC_DXT1:
format = gl.COMPRESSED_RGBA_S3TC_DXT1_EXT
//components = 3
blockSize = 8
case fourCC_DXT3:
format = gl.COMPRESSED_RGBA_S3TC_DXT3_EXT
//components = 4
blockSize = 16
case fourCC_DXT5:
format = gl.COMPRESSED_RGBA_S3TC_DXT5_EXT
//components = 4
blockSize = 16
default:
return gl.Texture(0), fmt.Errorf("Invalid four CC in DDS header. Got: %x; Expected %x; %x; or %x", header.PixelFormat.FourCC, fourCC_DXT1, fourCC_DXT3, fourCC_DXT5)
}
offset := 0
tex := gl.GenTexture()
tex.Bind(gl.TEXTURE_2D)
gl.PixelStorei(gl.UNPACK_ALIGNMENT, 1)
for level, width, height := 0, header.Width, header.Height; level < int(header.MipMapCount) && (width > 0 || height > 0); level, width, height = level+1, width/2, height/2 {
size := int(((width + 3) / 4) * ((height + 3) / 4) * blockSize)
gl.CompressedTexImage2D(gl.TEXTURE_2D, level, format, int(width), int(height), 0, size, &buffer[offset])
offset += size
}
return tex, nil
}
// loadFont loads the given font data. This does not deal with font scaling.
// Scaling should be handled by the independent Bitmap/Truetype loaders.
// We therefore expect the supplied image and charset to already be adjusted
// to the correct font scale.
//
// The image should hold a sprite sheet, defining the graphical layout for
// every glyph. The config describes font metadata.
func loadFont(img *image.RGBA, config *FontConfig) (f *Font, err error) {
f = new(Font)
f.config = config
// Resize image to next power-of-two.
img = glh.Pow2Image(img).(*image.RGBA)
ib := img.Bounds()
// Create the texture itself. It will contain all glyphs.
// Individual glyph-quads display a subset of this texture.
f.texture = gl.GenTexture()
f.texture.Bind(gl.TEXTURE_2D)
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.RGBA, ib.Dx(), ib.Dy(), 0,
gl.RGBA, gl.UNSIGNED_BYTE, img.Pix)
// Create display lists for each glyph.
f.listbase = gl.GenLists(len(config.Glyphs))
texWidth := float32(ib.Dx())
texHeight := float32(ib.Dy())
for index, glyph := range config.Glyphs {
// Update max glyph bounds.
if glyph.Width > f.maxGlyphWidth {
f.maxGlyphWidth = glyph.Width
}
if glyph.Height > f.maxGlyphHeight {
f.maxGlyphHeight = glyph.Height
}
// Quad width/height
vw := float32(glyph.Width)
vh := float32(glyph.Height)
// Texture coordinate offsets.
tx1 := float32(glyph.X) / texWidth
ty1 := float32(glyph.Y) / texHeight
tx2 := (float32(glyph.X) + vw) / texWidth
ty2 := (float32(glyph.Y) + vh) / texHeight
// Advance width (or height if we render top-to-bottom)
adv := float32(glyph.Advance)
gl.NewList(f.listbase+uint(index), gl.COMPILE)
{
gl.Begin(gl.QUADS)
{
gl.TexCoord2f(tx1, ty2)
gl.Vertex2f(0, 0)
gl.TexCoord2f(tx2, ty2)
gl.Vertex2f(vw, 0)
gl.TexCoord2f(tx2, ty1)
gl.Vertex2f(vw, vh)
gl.TexCoord2f(tx1, ty1)
gl.Vertex2f(0, vh)
}
gl.End()
switch config.Dir {
case LeftToRight:
gl.Translatef(adv, 0, 0)
case RightToLeft:
gl.Translatef(-adv, 0, 0)
case TopToBottom:
gl.Translatef(0, -adv, 0)
}
}
gl.EndList()
}
err = glh.CheckGLError()
return
}