// Screenshot takes a screenshot of the current window and return a
// RGBA image.Image.
func Screenshot(window mandala.Window) image.Image {
width, height := window.GetSize()
// Allocate the pixel buffer
pixels := make([]byte, width*height*4)
gl.PixelStorei(gl.PACK_ALIGNMENT, 1)
// Read the framebuffer
gl.ReadPixels(0, 0, gl.Sizei(width), gl.Sizei(height), gl.RGBA, gl.UNSIGNED_BYTE, gl.Void(&pixels[0]))
// Create a RGBA image
rect := image.Rect(0, 0, width, height)
img := image.NewRGBA(rect)
index := 0
for y := rect.Min.Y; y < rect.Max.Y; y++ {
for x := rect.Min.X; x < rect.Max.X; x++ {
color := color.RGBA{
pixels[index],
pixels[index+1],
pixels[index+2],
pixels[index+3],
}
img.Set(x, rect.Max.Y-y, color)
index += 4
}
}
return img
}
func newGameState(window mandala.Window) *gameState {
s := new(gameState)
s.window = window
s.window.MakeContextCurrent()
w, h := window.GetSize()
s.world = newWorld(w, h)
// Create the building reading it from a string
rand.Seed(int64(time.Now().Nanosecond()))
// Uncomment the following lines to generate the world
// starting from a string (defined in world.go)
// s.world.createFromString(pyramid)
// s.world.setGround(newGround(0, float32(10), float32(w), float32(10)))
s.world.createFromSvg("raw/world.svg")
gl.ClearColor(0.0, 0.0, 0.0, 1.0)
gl.Clear(gl.COLOR_BUFFER_BIT)
return s
}
// NewGameState creates a new game state. It needs a window onto which
// render the scene.
func NewGameState(window mandala.Window) *GameState {
s := new(GameState)
s.window = window
s.window.MakeContextCurrent()
w, h := window.GetSize()
s.World = NewWorld(w, h)
s.Fps = DefaultFps
// Uncomment the following lines to generate the world
// starting from a string (defined in world.go)
// s.World.CreateFromString(pyramid)
// s.World.setGround(newGround(s.World, 0, float32(10), float32(w), float32(10)))
s.World.CreateFromSvg("raw/world.svg")
gl.Enable(gl.BLEND)
gl.BlendFunc(gl.SRC_ALPHA, gl.ONE_MINUS_SRC_ALPHA)
gl.ClearColor(0.0, 0.0, 0.0, 1.0)
gl.Clear(gl.COLOR_BUFFER_BIT)
return s
}
// Run runs renderLoop. The loop renders a frame and swaps the buffer
// at each tick received.
func renderLoopFunc(control *renderLoopControl) loop.LoopFunc {
return func(loop loop.Loop) error {
var window mandala.Window
// Lock/unlock the loop to the current OS thread. This is
// necessary because OpenGL functions should be called from
// the same thread.
runtime.LockOSThread()
defer runtime.UnlockOSThread()
// Create an instance of ticker and immediately stop
// it because we don't want to swap buffers before
// initializing a rendering state.
ticker := time.NewTicker(time.Duration(1e9 / int(FRAMES_PER_SECOND)))
ticker.Stop()
for {
select {
case window = <-control.window:
ticker.Stop()
window.MakeContextCurrent()
width, height := window.GetSize()
gl.Viewport(0, 0, width, height)
mandala.Logf("Restarting rendering loop...")
ticker = time.NewTicker(time.Duration(1e9 / int(FRAMES_PER_SECOND)))
// Compute window radius
windowRadius = math.Sqrt(math.Pow(float64(height), 2) + math.Pow(float64(width), 2))
//gl.Init()
gl.Disable(gl.DEPTH_TEST)
// antialiasing
gl.Enable(gl.BLEND)
gl.BlendFunc(gl.SRC_ALPHA, gl.ONE_MINUS_SRC_ALPHA)
//gl.Enable(gl.LINE_SMOOTH)
// At each tick render a frame and swap buffers.
case <-ticker.C:
draw()
window.SwapBuffers()
case event := <-control.pause:
ticker.Stop()
event.Paused <- true
case <-control.resume:
case <-loop.ShallStop():
ticker.Stop()
return nil
}
}
}
}
func (renderState *renderState) init(window mandala.Window) {
window.MakeContextCurrent()
renderState.window = window
width, height := window.GetSize()
// Set the viewport
gl.Viewport(0, 0, gl.Sizei(width), gl.Sizei(height))
gl.ClearColor(0.0, 0.0, 1.0, 1.0)
}
func (renderState *renderState) init(window mandala.Window) {
window.MakeContextCurrent()
renderState.window = window
width, height := window.GetSize()
// Set the viewport
gl.Viewport(0, 0, gl.Sizei(width), gl.Sizei(height))
check()
// Compile the shaders
program := shaders.NewProgram(fsh, vsh)
program.Use()
check()
// Get attributes
attrPos = program.GetAttribute("pos")
attrTexIn = program.GetAttribute("texIn")
unifTexture = program.GetUniform("texture")
gl.EnableVertexAttribArray(attrPos)
gl.EnableVertexAttribArray(attrTexIn)
check()
// Upload texture data
img, err := loadImage(GOPHER_PNG)
if err != nil {
panic(err)
}
// Prepare the image to be placed on a texture.
bounds := img.Bounds()
imgWidth, imgHeight := bounds.Size().X, bounds.Size().Y
buffer := make([]byte, imgWidth*imgHeight*4)
index := 0
for y := bounds.Min.Y; y < bounds.Max.Y; y++ {
for x := bounds.Min.X; x < bounds.Max.X; x++ {
r, g, b, a := img.At(x, y).RGBA()
buffer[index] = byte(r)
buffer[index+1] = byte(g)
buffer[index+2] = byte(b)
buffer[index+3] = byte(a)
index += 4
}
}
gl.GenTextures(1, &textureBuffer)
gl.BindTexture(gl.TEXTURE_2D, textureBuffer)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.NEAREST)
gl.TexImage2D(gl.TEXTURE_2D, 0, gl.RGBA, gl.Sizei(imgWidth), gl.Sizei(imgHeight), 0, gl.RGBA, gl.UNSIGNED_BYTE, gl.Void(&buffer[0]))
check()
gl.ClearColor(0.0, 0.0, 0.0, 1.0)
}
func (renderState *renderState) init(window mandala.Window) {
window.MakeContextCurrent()
renderState.window = window
width, height := window.GetSize()
// Set the viewport
gl.Viewport(0, 0, gl.Sizei(width), gl.Sizei(height))
gl.ClearColor(0.0, 0.0, 0.0, 1.0)
renderState.boxProgram = shaders.NewProgram(shapes.DefaultBoxFS, shapes.DefaultBoxVS)
renderState.segmentProgram = shaders.NewProgram(shapes.DefaultSegmentFS, shapes.DefaultSegmentVS)
}
// Run runs renderLoop. The loop renders a frame and swaps the buffer
// at each tick received.
func renderLoopFunc(control *renderLoopControl) loop.LoopFunc {
return func(loop loop.Loop) error {
var window mandala.Window
// Lock/unlock the loop to the current OS thread. This is
// necessary because OpenGL functions should be called from
// the same thread.
runtime.LockOSThread()
defer runtime.UnlockOSThread()
// Create an instance of ticker and immediately stop
// it because we don't want to swap buffers before
// initializing a rendering state.
ticker := time.NewTicker(time.Duration(1e9 / int(FRAMES_PER_SECOND)))
ticker.Stop()
for {
select {
case window = <-control.window:
ticker.Stop()
window.MakeContextCurrent()
width, height := window.GetSize()
gl.Viewport(0, 0, gl.Sizei(width), gl.Sizei(height))
mandala.Logf("Restarting rendering loop...")
ticker = time.NewTicker(time.Duration(1e9 / int(FRAMES_PER_SECOND)))
// At each tick render a frame and swap buffers.
case <-ticker.C:
draw()
window.SwapBuffers()
case event := <-control.pause:
ticker.Stop()
event.Paused <- true
case <-control.resume:
case <-loop.ShallStop():
ticker.Stop()
return nil
}
}
}
}
func (renderState *renderState) init(window mandala.Window) {
window.MakeContextCurrent()
renderState.window = window
width, height := window.GetSize()
// Create the 3D world
renderState.world = cubelib.NewWorld(width, height)
renderState.world.SetCamera(0.0, 0.0, 5.0)
renderState.cube = cubelib.NewCube()
img, err := loadImage("drawable/marmo.png")
if err != nil {
panic(err)
}
renderState.cube.AttachTexture(img)
renderState.world.Attach(renderState.cube)
renderState.angle = 0.0
}