func initWindows() error {
if !glfw.Init() {
return errors.New("initializing GLFW")
}
return nil
}
func main() {
glfw.SetErrorCallback(errorCallback)
// lock glfw/gl calls to a single thread
runtime.LockOSThread()
runtime.GOMAXPROCS(8) // Render, read commands, send input, extra for file loading, etc
if !glfw.Init() {
panic("Could not init glfw!")
}
defer glfw.Terminate()
glfw.WindowHint(glfw.ContextVersionMajor, 3)
glfw.WindowHint(glfw.ContextVersionMinor, 3)
glfw.WindowHint(glfw.OpenglForwardCompatible, glfw.True)
glfw.WindowHint(glfw.OpenglProfile, glfw.OpenglCoreProfile)
window, err := glfw.CreateWindow(800, 600, "Example", nil, nil)
if err != nil {
panic(err)
}
window.SetFramebufferSizeCallback(func(w *glfw.Window, width, height int) {
fmt.Printf("Framebuffer size is now %vx%v\n", width, height)
// Keep aspect ratio from camwidth/camheight
camRatio := camWidth / camHeight
bufRatio := float32(width) / float32(height)
var newWidth, newHeight float32
switch {
case camRatio > bufRatio:
newHeight = float32(width) / camRatio
newWidth = float32(width)
case bufRatio > camRatio:
newWidth = float32(height) * camRatio
newHeight = float32(height)
}
fmt.Printf("Viewport size is now %vx%v; cam ratio is %v; viewport ratio is %v;\n", newWidth, newHeight, camRatio, newWidth/newHeight)
gl.Viewport((width-int(newWidth))/2, (height-int(newHeight))/2, int(newWidth), int(newHeight))
})
defer window.Destroy()
window.MakeContextCurrent()
glfw.SwapInterval(1)
gl.Init()
// Enable blending
gl.Enable(gl.BLEND)
gl.BlendFunc(gl.SRC_ALPHA, gl.ONE_MINUS_SRC_ALPHA)
vao := gl.GenVertexArray()
vao.Bind()
vbo := gl.GenBuffer()
vbo.Bind(gl.ARRAY_BUFFER)
verticies := []float32{-0.5, 0.5,
0.5, 0.5,
0.5, -0.5,
-0.5, -0.5}
gl.BufferData(gl.ARRAY_BUFFER, len(verticies)*4, verticies, gl.STATIC_DRAW)
vertex_shader := gl.CreateShader(gl.VERTEX_SHADER)
vertex_shader.Source(vertex)
vertex_shader.Compile()
fmt.Println(vertex_shader.GetInfoLog())
defer vertex_shader.Delete()
fragment_shader := gl.CreateShader(gl.FRAGMENT_SHADER)
fragment_shader.Source(fragment)
fragment_shader.Compile()
fmt.Println(fragment_shader.GetInfoLog())
defer fragment_shader.Delete()
program := gl.CreateProgram()
program.AttachShader(vertex_shader)
program.AttachShader(fragment_shader)
program.BindFragDataLocation(0, "outColor")
program.Link()
program.Use()
defer program.Delete()
positionAttrib := program.GetAttribLocation("position")
positionAttrib.AttribPointer(2, gl.FLOAT, false, 0, nil)
positionAttrib.EnableArray()
defer positionAttrib.DisableArray()
modelMat := program.GetUniformLocation("modelView")
projMat := program.GetUniformLocation("projection")
spriteSize := program.GetUniformLocation("size")
cmd := exec.Command(os.Args[1], os.Args[2:]...)
stdoutReader, stdoutWriter := io.Pipe()
cmd.Stdout = stdoutWriter
input := bufio.NewReader(stdoutReader)
stdinReader, stdinWriter := io.Pipe()
cmd.Stdin = stdinReader
stderr, err := cmd.StderrPipe()
chkErr(err)
go io.Copy(os.Stderr, stderr)
err = cmd.Start()
chkErr(err)
window.SetKeyCallback(handleKey)
go func() {
runtime.LockOSThread()
for !window.ShouldClose() {
sendInput(stdinWriter)
//fmt.Fprintf(stdinWriter, "T %v\n", time.Now())
<-ticks
readCommands(input)
}
}()
frameCnt := 0
queueDepth := 0
then := time.Now()
for !window.ShouldClose() {
frameCnt++
queueDepth += len(commandBus)
if frameCnt%120 == 0 {
fmt.Printf("Queue depth: %v. Render time: %v. Decode time: %v.\n", queueDepth/120, time.Since(then)/120, decodeTime/time.Duration(decodes))
queueDepth = 0
then = time.Now()
decodeTime = time.Duration(0)
decodes = 0
}
for len(commandBus) > 0 {
(<-commandBus)()
}
halfwidth := camWidth / 2.0
halfheight := camHeight / 2.0
projection := mathgl.Ortho2D(camera.x-halfwidth, camera.x+halfwidth, camera.y+halfheight, camera.y-halfheight)
projection = mathgl.Scale3D(camera.sx, camera.sy, 1).Mul4(projection)
projection = mathgl.HomogRotate3DZ(camera.rot).Mul4(projection)
projMat.UniformMatrix4f(false, (*[16]float32)(&projection))
gl.Clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT)
for _, sprite := range sprites {
sMat := mathgl.Scale3D(sprite.sx, sprite.sy, 1)
sMat = mathgl.HomogRotate3DZ(sprite.rot).Mul4(sMat)
sMat = mathgl.Translate3D(sprite.x, sprite.y, sprite.z).Mul4(sMat)
// temp hack bank in
sprite.bank = 1
sMap := findSMap(sprite.smap)
spriteSize.Uniform2f(float32(sMap.getWidth()*sprite.cellwidth), float32(sMap.getHeight()*sprite.cellheight))
modelMat.UniformMatrix4f(false, (*[16]float32)(&sMat))
gl.DrawArrays(gl.TRIANGLE_FAN, 0, 4)
}
window.SwapBuffers()
glfw.PollEvents()
if window.GetKey(glfw.KeyEscape) == glfw.Press {
window.SetShouldClose(true)
}
}
}