// gfxLoop is responsible for drawing things to the window. This loop must be
// independent of the Chippy main loop.
func gfxLoop(w *chippy.Window, r gfx.Renderer) {
w.SetSize(640, 640)
w.SetPositionCenter(chippy.DefaultScreen())
glr := r.(*gl2.Renderer)
glr.UpdateBounds(image.Rect(0, 0, 640, 640))
// Create a camera.
// Wait for the shader to load (not strictly required).
onLoad := make(chan *gfx.Shader, 1)
r.LoadShader(Wireframe, onLoad)
go func() {
<-onLoad
Wireframe.RLock()
if Wireframe.Loaded {
fmt.Println("Shader loaded")
} else {
fmt.Println(string(Wireframe.Error))
}
Wireframe.RUnlock()
}()
// Create a triangle object.
triangle := gfx.NewObject()
triangle.Shader = Wireframe
triangle.Meshes = []*gfx.Mesh{
&gfx.Mesh{},
}
triangle.Meshes[0].GenerateBary()
triangle.FaceCulling = gfx.NoFaceCulling
triangle.AlphaMode = gfx.AlphaToCoverage
tree := ntree.New()
level := 0
go func() {
events := w.Events()
for {
e := <-events
kev, ok := e.(keyboard.TypedEvent)
if ok {
if kev.Rune == ' ' || kev.Rune == 'b' {
for i := 0; i < 1; i++ {
s := random(0.1, 0.15)
if kev.Rune == 'b' {
s = random(0.1, 0.5)
}
tree.Add(s)
}
// Create new mesh and ask the renderer to load it.
newMesh := NTreeMesh(tree, level)
onLoad := make(chan *gfx.Mesh, 1)
r.LoadMesh(newMesh, onLoad)
<-onLoad
// Swap the mesh.
triangle.Lock()
triangle.Meshes[0] = newMesh
triangle.Unlock()
}
if kev.Rune == '1' || kev.Rune == '2' {
if kev.Rune == '1' {
level--
} else {
level++
}
fmt.Println("level", level)
// Create new mesh and ask the renderer to load it.
newMesh := NTreeMesh(tree, level)
onLoad := make(chan *gfx.Mesh, 1)
r.LoadMesh(newMesh, onLoad)
<-onLoad
// Swap the mesh.
triangle.Lock()
triangle.Meshes[0] = newMesh
triangle.Unlock()
}
if kev.Rune == 's' || kev.Rune == 'S' {
fmt.Println("Writing screenshot to file...")
// Download the image from the graphics hardware and save
// it to disk.
complete := make(chan image.Image, 1)
r.Download(image.Rect(0, 0, 0, 0), complete)
img := <-complete // Wait for download to complete.
// Save to png.
f, err := os.Create("screenshot.png")
if err != nil {
log.Fatal(err)
}
err = png.Encode(f, img)
if err != nil {
log.Fatal(err)
}
fmt.Println("Wrote texture to screenshot.png")
}
}
}
}()
for {
// Clear the entire area (empty rectangle means "the whole area").
r.Clear(image.Rect(0, 0, 0, 0), gfx.Color{1, 1, 1, 1})
r.ClearDepth(image.Rect(0, 0, 0, 0), 1.0)
// Update the rotation.
dt := r.Clock().Dt()
triangle.RLock()
rot := triangle.Transform.Rot()
if w.Keyboard.Down(keyboard.ArrowLeft) {
rot.Z += 90 * dt
}
if w.Keyboard.Down(keyboard.ArrowRight) {
rot.Z -= 90 * dt
}
if w.Keyboard.Down(keyboard.ArrowUp) {
rot.X += 20 * dt
}
if w.Keyboard.Down(keyboard.ArrowDown) {
rot.X -= 20 * dt
}
triangle.Transform.SetRot(rot)
triangle.RUnlock()
// Draw the triangle to the screen.
r.Draw(image.Rect(0, 0, 0, 0), triangle, nil)
// Render the whole frame.
r.Render()
}
}
// gfxLoop is responsible for drawing things to the window. This loop must be
// independent of the Chippy main loop.
func gfxLoop(w *chippy.Window, r gfx.Renderer) {
w.SetSize(640, 640)
w.SetPositionCenter(chippy.DefaultScreen())
glr := r.(*gl2.Renderer)
glr.UpdateBounds(image.Rect(0, 0, 640, 640))
// Create a perspective viewing frustum matrix.
width, height := 640, 640
aspectRatio := float64(width) / float64(height)
viewMat := gfx.ConvertMat4(math.Mat4Perspective(75.0, aspectRatio, 0.001, 1000.0))
// Create a camera.
camera := &gfx.Camera{
Object: new(gfx.Object),
Frustum: viewMat,
}
_ = camera
// Create a wireframe shader.
shader := &gfx.Shader{
Name: "wireframe shader",
GLSLVert: wireVert,
GLSLFrag: wireFrag,
Inputs: make(map[string]interface{}),
}
// Wait for the shader to load (not strictly required).
onLoad := make(chan *gfx.Shader, 1)
r.LoadShader(shader, onLoad)
<-onLoad
if shader.Loaded {
fmt.Println("Shader loaded")
} else {
fmt.Println(string(shader.Error))
}
// Create a triangle object.
triangle := &gfx.Object{
Shader: shader,
State: gfx.DefaultState,
Meshes: []*gfx.Mesh{
&gfx.Mesh{
Vertices: []gfx.Vec3{
// Top
{0, .9, 0},
{-.9, -.9, 0},
{.9, -.9, 0},
},
Colors: []gfx.Color{
// Top
{1, 0, 0, 0},
{0, 1, 0, 0},
{0, 0, 1, 0},
},
},
},
}
triangle.State.FaceCulling = gfx.NoFaceCulling
octree := gfx.NewOctree()
update := make(chan *gfx.Object)
go func() {
events := w.Events()
for {
e := <-events
kev, ok := e.(keyboard.TypedEvent)
if ok {
if kev.Rune == 'f' || kev.Rune == 'b' {
for i := 0; i < 100; i++ {
s := mySpatial{
aabb: randomAABB(0.1, 0.25),
}
if kev.Rune == 'b' {
s = mySpatial{
aabb: randomAABB(0.1, 0.5),
}
}
//s.aabb.Min.Z = -.1
//s.aabb.Max.Z = .1
//octree = gfx.NewOctree()
octree.Add(s)
//fmt.Println(s.AABB().Center(), s.AABB())
}
// Create new mesh and ask the renderer to load it.
newMesh := octreeMesh(octree)
onLoad := make(chan *gfx.Mesh, 1)
r.LoadMesh(newMesh, onLoad)
<-onLoad
// Take ownership of the triangle.
<-update
// Swap the mesh.
triangle.Meshes[0] = newMesh
// Give back ownership.
update <- triangle
}
if kev.Rune == 'q' {
// Take ownership of the triangle.
<-update
// Update rotation.
v, ok := triangle.Shader.Inputs["rx"]
rx := float32(0.0)
if ok {
rx = v.(float32)
}
rx += 0.1
triangle.Shader.Inputs["rx"] = rx
// Give back ownership.
update <- triangle
}
if kev.Rune == 's' || kev.Rune == 'S' {
fmt.Println("Writing screenshot to file...")
// Download the image from the graphics hardware and save
// it to disk.
complete := make(chan image.Image, 1)
r.Download(image.Rect(0, 0, 0, 0), complete)
img := <-complete // Wait for download to complete.
// Save to png.
f, err := os.Create("screenshot.png")
if err != nil {
log.Fatal(err)
}
err = png.Encode(f, img)
if err != nil {
log.Fatal(err)
}
fmt.Println("Wrote texture to screenshot.png")
}
}
}
}()
triangleDrawn := make(chan *gfx.Object, 1)
for {
// Clear the entire area (empty rectangle means "the whole area").
r.Clear(image.Rect(0, 0, 0, 0), gfx.Color{1, 1, 1, 1})
r.ClearDepth(image.Rect(0, 0, 0, 0), 1.0)
// See if someone else needs ownership of the triangle before we draw.
select {
case update <- triangle:
// Wait for them to give ownership back.
<-update
default:
}
// Draw the triangle to the screen.
r.Draw(image.Rect(0, 0, 0, 0), triangle, triangleDrawn)
// Render the whole frame.
r.Render()
select {
case <-triangleDrawn:
// Allow updates to the triangle if needed.
select {
case update <- triangle:
<-update
default:
}
}
}
}
func program(gfxLoop func(w *chippy.Window, r gfx.Renderer)) {
defer chippy.Exit()
window := chippy.NewWindow()
window.SetTitle("Azul3D")
screen := chippy.DefaultScreen()
window.SetPositionCenter(screen)
events := window.Events()
// Actually open the windows
err := window.Open(screen)
if err != nil {
log.Fatal(err)
}
// All OpenGL related calls must occur in the same OS thread.
runtime.LockOSThread()
defer runtime.UnlockOSThread()
// Choose and set a frame buffer configuration.
configs := window.GLConfigs()
bestConfig := chippy.GLChooseConfig(configs, chippy.GLWorstConfig, chippy.GLBestConfig)
log.Println("Chosen configuration:", bestConfig)
window.GLSetConfig(bestConfig)
// Create the OpenGL rendering context.
ctx, err := window.GLCreateContext(2, 1, chippy.GLCoreProfile, nil)
if err != nil {
log.Fatal(err)
}
// Create the OpenGL loader context.
loaderCtx, err := window.GLCreateContext(2, 1, chippy.GLCoreProfile, ctx)
if err != nil {
log.Fatal(err)
}
// OpenGL rendering context must be active to create the renderer.
window.GLMakeCurrent(ctx)
defer window.GLMakeCurrent(nil)
// Disable vertical sync.
//window.GLSetVerticalSync(chippy.NoVerticalSync)
// Create the renderer.
r, err := gl2.New()
if err != nil {
log.Fatal(err)
}
// Start the graphics rendering loop.
go gfxLoop(window, r)
// Channel to signal shutdown to renderer and loader.
shutdown := make(chan bool, 2)
// Start event loop.
go func() {
cl := r.Clock()
printFPS := time.Tick(1 * time.Second)
for {
select {
case <-printFPS:
window.SetTitle(fmt.Sprintf("Azul3D %vFPS (%f Avg.)", cl.FrameRate(), cl.AverageFrameRate()))
case e := <-events:
switch ev := e.(type) {
case chippy.ResizedEvent:
r.UpdateBounds(image.Rect(0, 0, ev.Width, ev.Height))
case chippy.CloseEvent, chippy.DestroyedEvent:
shutdown <- true
shutdown <- true
return
}
}
}
}()
// Start loading goroutine.
go func() {
// All OpenGL related calls must occur in the same OS thread.
runtime.LockOSThread()
defer runtime.UnlockOSThread()
// OpenGL loading context must be active.
window.GLMakeCurrent(loaderCtx)
defer window.GLMakeCurrent(nil)
for {
select {
case <-shutdown:
return
case fn := <-r.LoaderExec:
fn()
}
}
}()
// Enter rendering loop.
for {
select {
case <-shutdown:
return
case fn := <-r.RenderExec:
if renderedFrame := fn(); renderedFrame {
// Swap OpenGL buffers.
window.GLSwapBuffers()
}
}
}
}