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, 2)
glfw.WindowHint(glfw.ContextVersionMinor, 1)
window, err := glfw.CreateWindow(800, 600, "Cube", nil, nil)
if err != nil {
panic(err)
}
window.MakeContextCurrent()
if err := gl.Init(); err != nil {
panic(err)
}
texture = newTexture("square.png")
defer gl.DeleteTextures(1, &texture)
setupScene()
for !window.ShouldClose() {
drawScene()
window.SwapBuffers()
glfw.PollEvents()
}
}
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 (c *Context) DeleteTexture(t Texture) {
_ = c.runOnContextThread(func() error {
tt := uint32(t)
if !gl.IsTexture(tt) {
return nil
}
if c.lastTexture == t {
c.lastTexture = invalidTexture
}
gl.DeleteTextures(1, &tt)
return nil
})
}
func setupScene() {
gl.ClearColor(0, 0, 0, 0)
if texDel {
gl.DeleteTextures(1, tex1)
}
tex1 = newTexture(*slides[selCell].getImage(monWidth, monHeight))
gl.MatrixMode(gl.PROJECTION)
gl.LoadIdentity()
gl.Ortho(-1, 1, -1, 1, 1.0, 10.0)
gl.MatrixMode(gl.MODELVIEW)
gl.LoadIdentity()
texDel = true
}
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 (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)
}
// DeleteTexture deletes the given texture object.
//
// http://www.khronos.org/opengles/sdk/docs/man3/html/glDeleteTextures.xhtml
func DeleteTexture(v Texture) {
gl.DeleteTextures(1, &v.Value)
}
//Creates a new engine and populates it with the core functions
func LoadGraphics(e *Engine) *Engine {
e = add(e, "glfw.Init", NewCode("glfw.Init", 0, func(e *Engine, c *Thingy) *Engine {
err := glfw.Init()
if err != nil {
panic(err)
}
return e
}))
e = add(e, "GLFWEVENTLOOP", NewCode("GLFWEVENTLOOP", 1, func(e *Engine, c *Thingy) *Engine {
var el1 *Thingy
el1, e.dataStack = popStack(e.dataStack)
window := el1._structVal.(*glfw.Window)
window.MakeContextCurrent()
if err := gl.Init(); err != nil {
panic(err)
}
texture = newTexture("square.png")
defer gl.DeleteTextures(1, &texture)
setupScene()
for !window.ShouldClose() {
drawScene()
window.SwapBuffers()
glfw.PollEvents()
}
return e
}))
e = add(e, "wg.GetStringBounds", NewCode("wg.GetStringBounds", 0, func(e *Engine, c *Thingy) *Engine {
var el1 *Thingy
el1, e.dataStack = popStack(e.dataStack)
left, top, right, bottom := gc.GetStringBounds(el1.getString())
e.dataStack = append(e.dataStack, NewString(fmt.Sprintf("%v", bottom), c))
e.dataStack = append(e.dataStack, NewString(fmt.Sprintf("%v", right), c))
e.dataStack = append(e.dataStack, NewString(fmt.Sprintf("%v", top), c))
e.dataStack = append(e.dataStack, NewString(fmt.Sprintf("%v", left), c))
return e
}))
e = add(e, "wg.SetFillColor", NewCode("wg.SetFillColor", 1, func(e *Engine, c *Thingy) *Engine {
var el1 *Thingy
el1, e.dataStack = popStack(e.dataStack)
col := el1._structVal.(color.RGBA)
EnsureGC()
gc.SetFillColor(col)
return e
}))
e = add(e, "wg.SetStrokeColor", NewCode("wg.SetStrokeColor", 1, func(e *Engine, c *Thingy) *Engine {
var el1 *Thingy
el1, e.dataStack = popStack(e.dataStack)
col := el1._structVal.(color.RGBA)
EnsureGC()
gc.SetStrokeColor(col)
return e
}))
e = add(e, "wg.CloseAndFill", NewCode("wg.CloseAndFill", 0, func(e *Engine, c *Thingy) *Engine {
EnsureGC()
gc.Close()
gc.FillStroke()
return e
}))
e = add(e, "wg.MoveTo", NewCode("wg.MoveTo", 2, func(e *Engine, c *Thingy) *Engine {
var el1, el2 *Thingy
el1, e.dataStack = popStack(e.dataStack)
el2, e.dataStack = popStack(e.dataStack)
x1, _ := strconv.ParseFloat(el1.getString(), 32)
x2, _ := strconv.ParseFloat(el2.getString(), 32)
EnsureGC()
gc.MoveTo(float64(x1), float64(x2)) // should always be called first for a new path
return e
}))
e = add(e, "wg.LineTo", NewCode("wg.LineTo", 2, func(e *Engine, c *Thingy) *Engine {
var el1, el2 *Thingy
el1, e.dataStack = popStack(e.dataStack)
el2, e.dataStack = popStack(e.dataStack)
x1, _ := strconv.ParseFloat(el1.getString(), 32)
x2, _ := strconv.ParseFloat(el2.getString(), 32)
EnsureGC()
gc.LineTo(float64(x1), float64(x2)) // should always be called first for a new path
return e
}))
e = add(e, "wg.RoundedRectangle", NewCode("wg.RoundedRectangle", 2, func(e *Engine, c *Thingy) *Engine {
var el1, el2, el3, el4 *Thingy
el1, e.dataStack = popStack(e.dataStack)
el2, e.dataStack = popStack(e.dataStack)
el3, e.dataStack = popStack(e.dataStack)
el4, e.dataStack = popStack(e.dataStack)
x1, _ := strconv.ParseFloat(el1.getString(), 32)
x2, _ := strconv.ParseFloat(el2.getString(), 32)
x3, _ := strconv.ParseFloat(el3.getString(), 32)
x4, _ := strconv.ParseFloat(el4.getString(), 32)
EnsureGC()
draw2dkit.RoundedRectangle(gc, x1, x2, x3, x4, 10, 10)
gc.FillStroke()
return e
}))
e = add(e, "wg.FillStringAt", NewCode("wg.FillStringAt", 3, func(e *Engine, c *Thingy) *Engine {
var el1, el2, el3 *Thingy
el3, e.dataStack = popStack(e.dataStack)
el1, e.dataStack = popStack(e.dataStack)
el2, e.dataStack = popStack(e.dataStack)
x1, _ := strconv.ParseFloat(el1.getString(), 32)
x2, _ := strconv.ParseFloat(el2.getString(), 32)
EnsureGC()
// Set the font luximbi.ttf
gc.SetFontData(draw2d.FontData{Name: "luxi", Family: draw2d.FontFamilyMono, Style: draw2d.FontStyleBold | draw2d.FontStyleItalic})
// Set the fill text color to black
gc.SetFillColor(image.White)
gc.SetFontSize(15)
gc.FillStringAt(el3.getString(), float64(x1), float64(x2)) // should always be called first for a new path
return e
}))
e = add(e, "WG.CLEAR", NewCode("WG.CLEAR", 1, func(e *Engine, c *Thingy) *Engine {
var el3 *Thingy
el3, e.dataStack = popStack(e.dataStack)
col := el3._structVal.(color.RGBA)
wg.ClearImage(col)
return e
}))
e = add(e, "WG.TEST", NewCode("WG.TEST", 0, func(e *Engine, c *Thingy) *Engine {
/*var el1, el2,el3 *Thingy
el1, e.dataStack = popStack(e.dataStack)
el2, e.dataStack = popStack(e.dataStack)
el3, e.dataStack = popStack(e.dataStack)
x1, _ := strconv.ParseInt( el1.getString(), 10, 32 )
x2, _ := strconv.ParseInt( el2.getString(), 10, 32 )
col := el3._structVal.(color.RGBA) */
EnsureGC()
// Set some properties
gc.SetFillColor(color.RGBA{0x44, 0xff, 0x44, 0xff})
gc.SetStrokeColor(color.RGBA{0x44, 0x44, 0x44, 0xff})
gc.SetLineWidth(5)
// Draw a closed shape
gc.MoveTo(100, 100) // should always be called first for a new path
gc.LineTo(600, 150)
gc.QuadCurveTo(600, 10, 10, 10)
gc.Close()
gc.FillStroke()
return e
}))
e = add(e, "WG.SETPOINT", NewCode("WG.SETPOINT", 3, func(e *Engine, c *Thingy) *Engine {
var el1, el2, el3 *Thingy
el1, e.dataStack = popStack(e.dataStack)
el2, e.dataStack = popStack(e.dataStack)
el3, e.dataStack = popStack(e.dataStack)
x1, _ := strconv.ParseInt(el1.getString(), 10, 32)
x2, _ := strconv.ParseInt(el2.getString(), 10, 32)
col := el3._structVal.(color.RGBA)
wg.GetImage().Set(int(x1), int(x2), col)
return e
}))
e = add(e, "RGBA", NewCode("RGBA", 3, func(e *Engine, c *Thingy) *Engine {
var el1, el2, el3, el4 *Thingy
el1, e.dataStack = popStack(e.dataStack)
el2, e.dataStack = popStack(e.dataStack)
el3, e.dataStack = popStack(e.dataStack)
el4, e.dataStack = popStack(e.dataStack)
x1, _ := strconv.ParseInt(el1.getString(), 10, 32)
x2, _ := strconv.ParseInt(el2.getString(), 10, 32)
x3, _ := strconv.ParseInt(el3.getString(), 10, 32)
x4, _ := strconv.ParseInt(el4.getString(), 10, 32)
col := color.RGBA{uint8(x1), uint8(x2), uint8(x3), uint8(x4)}
e.dataStack = append(e.dataStack, NewWrapper(col))
return e
}))
e = add(e, "WG.GETKEY", NewCode("WG.GETKEY", 0, func(e *Engine, c *Thingy) *Engine {
var el1 *Thingy
el1, e.dataStack = popStack(e.dataStack)
xx, _ := strconv.ParseInt(el1.getString(), 10, 32)
var ret *Thingy
if wg.GetKey(int(xx)) {
ret = NewBool(1)
} else {
ret = NewBool(0)
}
e.dataStack = append(e.dataStack, ret)
return e
}))
e = add(e, "WG.START", NewCode("WG.START", 1, func(ne *Engine, c *Thingy) *Engine {
CallbackState = ne
var port *Thingy
port, ne.dataStack = popStack(ne.dataStack)
portnum, _ := strconv.ParseInt(port.getString(), 10, 32)
wg.Start(800, 600, int(portnum), WgCallback)
return ne
}))
e = add(e, "glfw.CreateWindow", NewCode("glfw.CreateWindow", 2, func(ne *Engine, c *Thingy) *Engine {
var x, y, title *Thingy
x, ne.dataStack = popStack(ne.dataStack)
y, ne.dataStack = popStack(ne.dataStack)
title, ne.dataStack = popStack(ne.dataStack)
xx, _ := strconv.ParseInt(x.getString(), 10, 32)
yy, _ := strconv.ParseInt(y.getString(), 10, 32)
glfw.WindowHint(glfw.Resizable, glfw.False)
glfw.WindowHint(glfw.ContextVersionMajor, 2)
glfw.WindowHint(glfw.ContextVersionMinor, 1)
window, err := glfw.CreateWindow(int(xx), int(yy), title.getString(), nil, nil)
if err != nil {
panic(err)
}
ne.dataStack = pushStack(ne.dataStack, NewWrapper(window))
return ne
}))
return e
}
func (c *Context) DeleteTexture(t Texture) {
tt := uint32(t)
gl.DeleteTextures(1, &tt)
}
// DeleteTexture will free the texture from the GPU memory
func (c *Context) DeleteTexture(texture *Texture) {
gl.DeleteTextures(1, &[]uint32{texture.uint32}[0])
}
func (texture *Texture) Delete() {
gl.DeleteTextures(1, &texture.id)
}
// Release releases font resources.
// A font can no longer be used for rendering after this call completes.
func (f *Font) Release() {
gl.DeleteTextures(1, &f.texture)
gl.DeleteLists(f.listbase, int32(len(f.config.Glyphs)))
f.config = nil
}