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)
}
func (atlas *FontAtlas) Draw(text string, b Bounds) {
atlas.LoadGlyphs(text)
gl.Enable(gl.BLEND)
defer gl.Disable(gl.BLEND)
gl.BlendFunc(gl.ONE, gl.ONE_MINUS_SRC_ALPHA)
gl.Enable(gl.TEXTURE_2D)
defer gl.Disable(gl.TEXTURE_2D)
gl.BindTexture(gl.TEXTURE_2D, atlas.Texture)
x := b.Min.X + atlas.drawPadding
y := (b.Max.Y+b.Min.Y)/2 + (ceilPxf(atlas.maxBounds.Min.Y)+ceilPxf(atlas.maxBounds.Max.Y))/2
p := rune(0)
for _, r := range text {
glyph := atlas.Rendered[r]
dx := float32(glyph.Loc.Dx())
dy := float32(glyph.Loc.Dy())
px := x + ceilPxf(glyph.Bounds.Min.X) - glyphPadding
py := y + ceilPxf(glyph.Bounds.Min.Y) - glyphPadding
// this is not the ideal way of positioning the letters
// will create positioning artifacts
// but it the result is more
px = float32(math.Trunc(float64(px)))
py = float32(math.Trunc(float64(py)))
gl.Begin(gl.QUADS)
{
gl.TexCoord2f(glyph.RelLoc.Min.X, glyph.RelLoc.Min.Y)
gl.Vertex2f(px, py)
gl.TexCoord2f(glyph.RelLoc.Max.X, glyph.RelLoc.Min.Y)
gl.Vertex2f(px+dx, py)
gl.TexCoord2f(glyph.RelLoc.Max.X, glyph.RelLoc.Max.Y)
gl.Vertex2f(px+dx, py+dy)
gl.TexCoord2f(glyph.RelLoc.Min.X, glyph.RelLoc.Max.Y)
gl.Vertex2f(px, py+dy)
}
gl.End()
k := atlas.Face.Kern(p, r)
p = r
x += ceilPxf(glyph.Advance + k)
}
}
func LoadTexture(path string) {
//fmt.Printf("Trying to load texture %q: ", path)
// Open the file
file, err := os.Open(path)
if err != nil {
fmt.Println(os.Getwd())
log.Fatal(err)
}
defer file.Close()
// Decode the image
img, _, err := image.Decode(file)
if err != nil {
log.Fatal(err)
}
bounds := img.Bounds()
//fmt.Printf("Loaded %vx%v texture.\n", bounds.Dx(), bounds.Dy())
var format int
var pixPointer *uint8
switch img := img.(type) {
case *image.RGBA:
format = gl.RGBA
pixPointer = &img.Pix[0]
case *image.NRGBA:
format = gl.RGBA
pixPointer = &img.Pix[0]
case *image.Gray:
format = gl.ALPHA
pixPointer = &img.Pix[0]
default:
log.Fatalf("LoadTexture: Unsupported type %T.\n", img)
}
var texture uint32
gl.GenTextures(1, &texture)
gl.BindTexture(gl.TEXTURE_2D, texture)
gl.TexParameteri(gl.TEXTURE_2D, gl.GENERATE_MIPMAP, gl.TRUE)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR_MIPMAP_LINEAR)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.LINEAR)
gl.TexParameterf(gl.TEXTURE_2D, gl.TEXTURE_LOD_BIAS, -0.5)
gl.TexImage2D(gl.TEXTURE_2D, 0, int32(format), int32(bounds.Dx()), int32(bounds.Dy()), 0, uint32(format), gl.UNSIGNED_BYTE, gl.Ptr(pixPointer))
CheckGLError()
}
func (v *Video) initGL() {
if err := gl.Init(); err != nil {
panic(err)
}
gl.Enable(gl.CULL_FACE)
gl.Enable(gl.DEPTH_TEST)
gl.ClearColor(0.0, 0.0, 0.0, 1.0)
v.prog = createProgram(vertShaderSrcDef, fragShaderSrcDef)
posAttrib := uint32(gl.GetAttribLocation(v.prog, gl.Str("vPosition"+"\x00")))
texCoordAttr := uint32(gl.GetAttribLocation(v.prog, gl.Str("vTexCoord"+"\x00")))
v.textureUni = gl.GetAttribLocation(v.prog, gl.Str("texture"+"\x00"))
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.NEAREST)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.NEAREST)
gl.UseProgram(v.prog)
gl.EnableVertexAttribArray(posAttrib)
gl.EnableVertexAttribArray(texCoordAttr)
//posAttrib.EnableArray()
//texCoordAttr.EnableArray()
var vbo uint32
gl.GenBuffers(1, &vbo)
gl.BindBuffer(gl.ARRAY_BUFFER, vbo)
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])), gl.Ptr(verts), gl.STATIC_DRAW)
var textCoorBuf uint32
gl.GenBuffers(1, &textCoorBuf)
gl.BindBuffer(gl.ARRAY_BUFFER, textCoorBuf)
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])), gl.Ptr(texVerts), gl.STATIC_DRAW)
gl.VertexAttribPointer(posAttrib, 2, gl.FLOAT, false, 0, gl.PtrOffset(0))
gl.VertexAttribPointer(texCoordAttr, 2, gl.FLOAT, false, 0, gl.PtrOffset(0))
//posAttrib.AttribPointer(2, gl.FLOAT, false, 0, uintptr(0))
//texCoordAttr.AttribPointer(2, gl.FLOAT, false, 0, uintptr(0))
}
func (atlas *FontAtlas) draw(rendered *image.RGBA, b Bounds) {
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(rendered.Bounds().Dx()),
int32(rendered.Bounds().Dy()),
0,
gl.RGBA,
gl.UNSIGNED_BYTE,
gl.Ptr(rendered.Pix))
gl.Enable(gl.BLEND)
gl.BlendFunc(gl.ONE, gl.ONE_MINUS_SRC_ALPHA)
gl.Begin(gl.QUADS)
{
gl.TexCoord2f(0, 0)
gl.Vertex2f(b.Min.X, b.Min.Y)
gl.TexCoord2f(1, 0)
gl.Vertex2f(b.Max.X, b.Min.Y)
gl.TexCoord2f(1, 1)
gl.Vertex2f(b.Max.X, b.Max.Y)
gl.TexCoord2f(0, 1)
gl.Vertex2f(b.Min.X, b.Max.Y)
}
gl.End()
gl.Disable(gl.BLEND)
gl.DeleteTextures(1, &texture)
gl.Disable(gl.TEXTURE_2D)
}
func NewGLImageFromImage(img image.Image) (*glImage, error) {
var rgba *image.RGBA
if asRGBA, ok := img.(*image.RGBA); ok {
rgba = asRGBA
} else {
rgba = image.NewRGBA(img.Bounds())
if rgba.Stride != rgba.Rect.Size().X*4 {
return nil, errors.New("unsupported stride")
}
draw.Draw(rgba, rgba.Bounds(), img, image.Point{0, 0}, draw.Src)
}
var tex uint32
gl.Enable(gl.TEXTURE_2D)
gl.GenTextures(1, &tex)
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.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.Bounds().Dx()),
int32(rgba.Bounds().Dy()),
0,
gl.RGBA,
gl.UNSIGNED_BYTE,
gl.Ptr(rgba.Pix),
)
return &glImage{
tex,
img.Bounds().Dx(),
img.Bounds().Dy(),
0.0,
0.0,
1.0,
1.0,
}, nil
}
func (c *Context) NewTexture(width, height int, pixels []uint8, filter Filter) (Texture, error) {
var t uint32
gl.GenTextures(1, &t)
if t < 0 {
return 0, errors.New("glGenTexture failed")
}
gl.PixelStorei(gl.UNPACK_ALIGNMENT, 4)
gl.BindTexture(gl.TEXTURE_2D, t)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, int32(filter))
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, int32(filter))
var p interface{}
if pixels != nil {
p = pixels
}
gl.TexImage2D(gl.TEXTURE_2D, 0, gl.RGBA, int32(width), int32(height), 0, gl.RGBA, gl.UNSIGNED_BYTE, gl.Ptr(p))
return Texture(t), nil
}
func my_print(x, y float64, text string, ftex uint32, cdata []*truetype.BakedChar) {
gl.Enable(gl.TEXTURE_2D)
gl.BindTexture(gl.TEXTURE_2D, ftex)
gl.Begin(gl.QUADS)
for _, b := range text {
if int(b) >= 32 && int(b) < 128 {
var q *truetype.AlignedQuad
x, q = truetype.GetBakedQuad(cdata, 512, 512, int(b)-32, x, y, true)
gl.TexCoord2f(q.S0, q.T0)
gl.Vertex2f(q.X0, q.Y0)
gl.TexCoord2f(q.S1, q.T0)
gl.Vertex2f(q.X1, q.Y0)
gl.TexCoord2f(q.S1, q.T1)
gl.Vertex2f(q.X1, q.Y1)
gl.TexCoord2f(q.S0, q.T1)
gl.Vertex2f(q.X0, q.Y1)
}
}
gl.End()
}
func Render() {
gl.ClearColor(0, 0, 0, 1)
gl.Clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT)
gl.Color4f(1, 1, 1, 1)
gl.BindTexture(gl.TEXTURE_2D, game.Texture)
gl.PushMatrix()
gl.Translatef(20-float32(game.PlayerX), 15-float32(game.PlayerY), 0)
gl.Begin(gl.TRIANGLES)
for i := 0; i < game.Width; i++ {
for j := 0; j < game.Height; j++ {
renderTile(game.Tiles[(j*game.Width)+i], float32(i), float32(j))
}
}
// Player
gl.Color4f(1, 0, 0, 1)
renderTile(4, float32(game.PlayerX), float32(game.PlayerY))
gl.End()
gl.PopMatrix()
}
func List(width, height int, list *draw.List) {
gl.Enable(gl.BLEND)
gl.BlendFunc(gl.SRC_ALPHA, gl.ONE_MINUS_SRC_ALPHA)
gl.Enable(gl.SCISSOR_TEST)
defer gl.Disable(gl.SCISSOR_TEST)
gl.EnableClientState(gl.VERTEX_ARRAY)
defer gl.DisableClientState(gl.VERTEX_ARRAY)
gl.EnableClientState(gl.COLOR_ARRAY)
defer gl.DisableClientState(gl.COLOR_ARRAY)
gl.EnableClientState(gl.TEXTURE_COORD_ARRAY)
defer gl.DisableClientState(gl.TEXTURE_COORD_ARRAY)
gl.VertexPointer(2, gl.FLOAT, vertexStride, unsafe.Pointer(&(list.Vertices[0].P)))
gl.TexCoordPointer(2, gl.FLOAT, vertexStride, unsafe.Pointer(&(list.Vertices[0].UV)))
gl.ColorPointer(4, gl.UNSIGNED_BYTE, vertexStride, unsafe.Pointer(&(list.Vertices[0].Color)))
offset := 0
for _, cmd := range list.Commands {
if cmd.Count == 0 {
continue
}
if cmd.Texture == 0 {
gl.Disable(gl.TEXTURE_2D)
} else {
gl.Enable(gl.TEXTURE_2D)
gl.BindTexture(gl.TEXTURE_2D, uint32(cmd.Texture))
}
x, y, w, h := cmd.Clip.AsInt32()
gl.Scissor(x, int32(height)-y-h, w, h)
gl.DrawElements(gl.TRIANGLES, int32(cmd.Count), indexType, gl.Ptr(list.Indicies[offset:]))
offset += int(cmd.Count)
}
}
func (atlas *FontAtlas) upload() {
if !atlas.Dirty {
return
}
atlas.Dirty = false
gl.Enable(gl.TEXTURE_2D)
if atlas.Texture != 0 {
gl.DeleteTextures(1, &atlas.Texture)
atlas.Texture = 0
}
gl.GenTextures(1, &atlas.Texture)
gl.BindTexture(gl.TEXTURE_2D, atlas.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(atlas.Image.Rect.Size().X),
int32(atlas.Image.Rect.Size().Y),
0,
gl.RGBA,
gl.UNSIGNED_BYTE,
gl.Ptr(atlas.Image.Pix))
if err := gl.GetError(); err != 0 {
log.Println(err)
}
gl.Disable(gl.TEXTURE_2D)
}
func newTexture(file string) uint32 {
imgFile, err := os.Open(file)
if err != nil {
panic(err)
}
img, _, err := image.Decode(imgFile)
if err != nil {
panic(err)
}
rgba := image.NewRGBA(img.Bounds())
if rgba.Stride != rgba.Rect.Size().X*4 {
panic("unsupported stride")
}
draw.Draw(rgba, rgba.Bounds(), img, image.Point{0, 0}, 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 texture
}
func (o *openGLCanvas) Draw(tile image.Rectangle, where image.Rectangle, f tmx.FlipMode, tileset string) {
if _, ok := o.sets[tileset]; !ok {
o.sets[tileset] = newChipset(tileset, tile.Max.X-tile.Min.X)
}
c := o.sets[tileset]
gl.BindTexture(gl.TEXTURE_2D, c.handle)
// Texture coords
fts := float32(c.tilesize)
tileWidthPixels := fts / float32(c.width)
tileHeightPixels := fts / float32(c.height)
startX := (float32(tile.Min.X) / fts) * tileWidthPixels
startY := (float32(tile.Min.Y) / fts) * tileHeightPixels
endX := startX + tileWidthPixels
endY := startY + tileHeightPixels
// Draw coords
drawX := float32(where.Min.X)
drawY := float32(where.Min.Y)
gl.Begin(gl.QUADS)
{
gl.TexCoord2f(startX, startY)
gl.Vertex3f(drawX*o.scaleX, drawY*o.scaleY, 0)
gl.TexCoord2f(startX, endY)
gl.Vertex3f(drawX*o.scaleX, (drawY+fts)*o.scaleY, 0)
gl.TexCoord2f(endX, endY)
gl.Vertex3f((drawX+fts)*o.scaleX, (drawY+fts)*o.scaleY, 0)
gl.TexCoord2f(endX, startY)
gl.Vertex3f((drawX+fts)*o.scaleX, (drawY)*o.scaleY, 0)
}
gl.End()
}
func New(cachew, cacheh int) *Stash {
stash := &Stash{}
// Create data for clearing the textures
stash.emptyData = make([]byte, cachew*cacheh)
// Create first texture for the cache
stash.tw = cachew
stash.th = cacheh
stash.itw = 1 / float64(cachew)
stash.ith = 1 / float64(cacheh)
gl.Enable(gl.TEXTURE_2D)
stash.ttTextures = make([]*Texture, 1)
stash.ttTextures[0] = &Texture{}
gl.GenTextures(1, &stash.ttTextures[0].id)
gl.BindTexture(gl.TEXTURE_2D, stash.ttTextures[0].id)
gl.TexImage2D(gl.TEXTURE_2D, 0, gl.ALPHA, int32(cachew), int32(cacheh),
0, gl.ALPHA, gl.UNSIGNED_BYTE, unsafe.Pointer(&stash.emptyData[0]))
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.LINEAR)
gl.Disable(gl.TEXTURE_2D)
return stash
}
// BindTexture binds a texture.
//
// http://www.khronos.org/opengles/sdk/docs/man3/html/glBindTexture.xhtml
func BindTexture(target Enum, t Texture) {
gl.BindTexture(uint32(target), t.Value)
}
func drawScene() {
gl.Clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT)
gl.MatrixMode(gl.MODELVIEW)
gl.LoadIdentity()
gl.Translatef(0, 0, -3.0)
gl.Rotatef(rotationX, 1, 0, 0)
gl.Rotatef(rotationY, 0, 1, 0)
rotationX += 0.5
rotationY += 0.5
gl.BindTexture(gl.TEXTURE_2D, texture)
gl.Color4f(1, 1, 1, 1)
gl.Begin(gl.QUADS)
gl.Normal3f(0, 0, 1)
gl.TexCoord2f(0, 0)
gl.Vertex3f(-1, -1, 1)
gl.TexCoord2f(1, 0)
gl.Vertex3f(1, -1, 1)
gl.TexCoord2f(1, 1)
gl.Vertex3f(1, 1, 1)
gl.TexCoord2f(0, 1)
gl.Vertex3f(-1, 1, 1)
gl.Normal3f(0, 0, -1)
gl.TexCoord2f(1, 0)
gl.Vertex3f(-1, -1, -1)
gl.TexCoord2f(1, 1)
gl.Vertex3f(-1, 1, -1)
gl.TexCoord2f(0, 1)
gl.Vertex3f(1, 1, -1)
gl.TexCoord2f(0, 0)
gl.Vertex3f(1, -1, -1)
gl.Normal3f(0, 1, 0)
gl.TexCoord2f(0, 1)
gl.Vertex3f(-1, 1, -1)
gl.TexCoord2f(0, 0)
gl.Vertex3f(-1, 1, 1)
gl.TexCoord2f(1, 0)
gl.Vertex3f(1, 1, 1)
gl.TexCoord2f(1, 1)
gl.Vertex3f(1, 1, -1)
gl.Normal3f(0, -1, 0)
gl.TexCoord2f(1, 1)
gl.Vertex3f(-1, -1, -1)
gl.TexCoord2f(0, 1)
gl.Vertex3f(1, -1, -1)
gl.TexCoord2f(0, 0)
gl.Vertex3f(1, -1, 1)
gl.TexCoord2f(1, 0)
gl.Vertex3f(-1, -1, 1)
gl.Normal3f(1, 0, 0)
gl.TexCoord2f(1, 0)
gl.Vertex3f(1, -1, -1)
gl.TexCoord2f(1, 1)
gl.Vertex3f(1, 1, -1)
gl.TexCoord2f(0, 1)
gl.Vertex3f(1, 1, 1)
gl.TexCoord2f(0, 0)
gl.Vertex3f(1, -1, 1)
gl.Normal3f(-1, 0, 0)
gl.TexCoord2f(0, 0)
gl.Vertex3f(-1, -1, -1)
gl.TexCoord2f(1, 0)
gl.Vertex3f(-1, -1, 1)
gl.TexCoord2f(1, 1)
gl.Vertex3f(-1, 1, 1)
gl.TexCoord2f(0, 1)
gl.Vertex3f(-1, 1, -1)
gl.End()
}