func GetShaderInfoLog(shader uint32) string {
var logSize int32 = 0
gl.GetShaderiv(shader, gl.INFO_LOG_LENGTH, &logSize)
var infoLog []uint8 = make([]uint8, logSize)
gl.GetShaderInfoLog(shader, logSize, &logSize, &infoLog[0])
return gl.GoStr(&infoLog[0])
}
func CreateContext(width int, height int) (*Context, error) {
if err := glfw.Init(); err != nil {
fmt.Println("failed to initialize glfw:", err)
}
glfw.WindowHint(glfw.Resizable, glfw.False)
glfw.WindowHint(glfw.ContextVersionMajor, 4)
glfw.WindowHint(glfw.ContextVersionMinor, 1)
glfw.WindowHint(glfw.OpenGLProfile, glfw.OpenGLCoreProfile)
glfw.WindowHint(glfw.OpenGLForwardCompatible, glfw.True)
window, err := glfw.CreateWindow(width, height, "flamingo", nil, nil)
if err != nil {
glfw.Terminate()
return nil, err
}
window.MakeContextCurrent()
// Initialize Glow
if err = gl.Init(); err != nil {
glfw.Terminate()
return nil, err
}
version := gl.GoStr(gl.GetString(gl.VERSION))
fmt.Println("OpenGL version", version)
return &Context{window}, nil
}
func (p *Program) GetProgramInfoLog() string {
var logSize int32 = 0
gl.GetProgramiv(p.prog, gl.INFO_LOG_LENGTH, &logSize)
var infoLog []uint8 = make([]uint8, logSize)
gl.GetProgramInfoLog(p.prog, logSize, &logSize, &infoLog[0])
return gl.GoStr(&infoLog[0])
}
func initGL() string {
// Initialize Glow
if err := gl.Init(); err != nil {
panic(err)
}
version := gl.GoStr(gl.GetString(gl.VERSION))
fmt.Println("OpenGL version", version)
fmt.Println("OpenGl shading version", gl.GoStr(gl.GetString(gl.SHADING_LANGUAGE_VERSION)))
fmt.Println("OpenGl renderer", gl.GoStr(gl.GetString(gl.RENDERER)))
// Configure global settings
gl.Enable(gl.DEPTH_TEST)
gl.DepthFunc(gl.LESS)
gl.ClearColor(0.5, 0.5, 0.5, 1.0)
return version
}
func Run() {
if err := glfw.Init(); err != nil {
glog.Fatalln("failed to initialize glfw", err)
}
defer glfw.Terminate()
setupWindowOptions()
window, err := glfw.CreateWindow(WindowWidth, WindowHeight, "Game", nil, nil)
if err != nil {
panic(err)
}
window.MakeContextCurrent()
//initilize Glow
if err := gl.Init(); err != nil {
panic(err)
}
version := gl.GoStr(gl.GetString(gl.VERSION))
fmt.Println("OpenGL version", version)
shaderSource, err := ReadShaders("colorShader")
if err != nil {
panic(err)
}
program, err := NewProgram(shaderSource)
if err != nil {
panic(err)
}
program.Use()
sprite := &SpriteComponent{-.5, -.5, 1, 1}
sprite.ReloadGraphics()
vertAttrib := uint32(gl.GetAttribLocation(program.program, CStr("vertPosition")))
gl.EnableVertexAttribArray(vertAttrib)
gl.VertexAttribPointer(vertAttrib, 3, gl.FLOAT, false, 0, gl.PtrOffset(0))
gl.Enable(gl.DEPTH_TEST)
gl.DepthFunc(gl.LESS)
gl.ClearColor(1.0, 1.0, 1.0, 1.0)
for !window.ShouldClose() {
gl.Clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT)
program.Use()
gl.BindVertexArray(sprite.vaoID)
gl.DrawArrays(gl.TRIANGLES, 0, 2*3)
window.SwapBuffers()
glfw.PollEvents()
}
}
// New returns a newly created Screen
func New(width int, height int, fullscreen bool, FSAA int, name string) *Screen {
window := &Screen{}
C.SDL_Init(C.SDL_INIT_VIDEO)
C.setGlContextAttributes()
C.SDL_GL_SetAttribute(C.SDL_GL_DOUBLEBUFFER, 1)
// Force hardware accel
C.SDL_GL_SetAttribute(C.SDL_GL_ACCELERATED_VISUAL, 1)
if FSAA > 0 {
// FSAA (Fullscreen antialiasing)
C.SDL_GL_SetAttribute(C.SDL_GL_MULTISAMPLEBUFFERS, 1)
C.SDL_GL_SetAttribute(C.SDL_GL_MULTISAMPLESAMPLES, C.int(FSAA)) // 2, 4, 8
}
flags := C.SDL_WINDOW_OPENGL | C.SDL_RENDERER_ACCELERATED
if fullscreen {
flags = flags | C.SDL_WINDOW_FULLSCREEN
}
C.SDL_CreateWindowAndRenderer(C.int(width), C.int(height), C.Uint32(flags), &window.sdlWindow, &window.renderer)
C.SDL_SetWindowTitle(window.sdlWindow, C.CString(name))
C.SDL_GL_CreateContext(window.sdlWindow)
if err := gl.Init(); err != nil {
panic(err)
}
version := gl.GoStr(gl.GetString(gl.VERSION))
fmt.Println("OpenGL version", version)
// Configure global settings
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 | gl.DEPTH_BUFFER_BIT)
window.Width = width
window.Height = height
window.name = name
window.shouldClose = false
C.SDL_GL_SwapWindow(window.sdlWindow)
window.startTime = time.Now()
window.frameTime = time.Now()
C.SDL_GL_SetSwapInterval(1)
window.vsync = true
return window
}
func getGlError(glHandle uint32, checkTrueParam uint32, getObjIvFn getObjIv,
getObjInfoLogFn getObjInfoLog, failMsg string) error {
var success int32
getObjIvFn(glHandle, checkTrueParam, &success)
if success == gl.FALSE {
var logLength int32
getObjIvFn(glHandle, gl.INFO_LOG_LENGTH, &logLength)
log := gl.Str(strings.Repeat("\x00", int(logLength)))
getObjInfoLogFn(glHandle, logLength, nil, log)
return fmt.Errorf("%s: %s", failMsg, gl.GoStr(log))
}
return nil
}
func (screen *Screen) Init(title string, onCloseHandler func(), chip *chip8.Chip8) {
var err error
screen.chip = chip
err = glfw.Init()
if err != nil {
panic(err)
}
window, err := glfw.CreateWindow(SCREEN_WIDTH, SCREEN_HEIGHT, title, nil, nil)
if err != nil {
panic(err)
}
window.MakeContextCurrent()
// Initialize Glow
if err := gl.Init(); err != nil {
panic(err)
}
version := gl.GoStr(gl.GetString(gl.VERSION))
fmt.Println("OpenGL version", version)
gl.ClearColor(255.0, 0.0, 0.0, 0.0) //Set the cleared screen colour to black
gl.Viewport(0, 0, int32(SCREEN_WIDTH), int32(SCREEN_HEIGHT)) //This sets up the viewport so that the coordinates (0, 0) are at the top left of the window
for !window.ShouldClose() {
// Do OpenGL stuff
gl.Clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT)
window.SwapBuffers()
glfw.PollEvents()
}
onCloseHandler()
}
/* ***************** MAIN FUNCTION ************************ */
func main() {
/* **************** OVR INIT CODE ***************** */
if err := glfw.Init(); err != nil {
log.Fatalln("failed to initialize glfw")
}
defer glfw.Terminate()
C.ovr_Initialize(nil)
//create an HMD for reference.
var hmd C.ovrHmd = nil
// find number of headsets
hmdCount := (int)(C.ovrHmd_Detect())
// print headset count
fmt.Println(hmdCount)
fmt.Printf("Found %d connected Rift device(s)\n\n", hmdCount)
// grab the first headset
if hmdCount > 0 {
for i := 0; i < 1; i++ {
hmd = C.ovrHmd_Create((C.int)(i))
//Print headset name
fmt.Println(C.GoString(hmd.ProductName))
}
}
//if there is no headset connected, create a new debug.
if hmd == nil {
fmt.Println("Unable to open rift device\n Creating debug device.\n")
hmd = C.ovrHmd_CreateDebug(C.ovrHmd_DK2)
}
//Starts the sensor device
if C.ovrHmd_ConfigureTracking(hmd, C.ovrTrackingCap_Orientation|C.ovrTrackingCap_Position, 0) == 0 {
fmt.Println("Unable to start Rift head tracker\n")
}
//extendedMode := C.ovrHmdCap_ExtendDesktop & hmd.HmdCaps
//positioning of window and size of window
var outposition mgl32.Vec2
outposition[0] = (float32)(hmd.WindowsPos.x)
outposition[1] = (float32)(hmd.WindowsPos.y)
//TODO: Change this to output at chosen resolution, not necessarily native pg. 76 Oculus Rift in action
var outsize mgl32.Vec2
outsize[0] = (float32)(hmd.Resolution.w)
outsize[1] = (float32)(hmd.Resolution.h)
//print position and sizes to console
fmt.Printf("Rift position:\t\t %f \t %f \nRift Size:\t\t %f \t %f \n\n", outposition.X(), outposition.Y(), outsize.X(), outsize.Y())
monitors := glfw.GetMonitors()
var riftIndex int
//loop over the monitors
for index, element := range monitors {
//print the monitor positions
posX, posY := element.GetPos()
fmt.Printf("Monitor Position:\t\t %d \t %d\n", posX, posY)
if float32(posX) == outposition.X() && float32(posY) == outposition.Y() {
riftIndex = index
}
}
//Get video mode of monitor
mode := monitors[riftIndex].GetVideoMode()
outsize[0] = float32(mode.Width)
outsize[1] = float32(mode.Height)
/* ***************************************************** */
// ************* OPENGL / GLFW INIT CODE ************** */
glfw.WindowHint(glfw.Decorated, 0)
glfw.WindowHint(glfw.Resizable, glfw.False)
glfw.WindowHint(glfw.ContextVersionMajor, 4)
glfw.WindowHint(glfw.ContextVersionMinor, 1)
glfw.WindowHint(glfw.OpenGLProfile, glfw.OpenGLCoreProfile)
glfw.WindowHint(glfw.OpenGLForwardCompatible, glfw.True)
window, err := glfw.CreateWindow(int(outsize.X()), int(outsize.Y()), "LinuxVR", nil, nil)
window.SetPos(int(outposition.X()), int(outposition.Y()))
if gl.Init(); err != nil {
panic(err)
}
window.MakeContextCurrent()
//Print OpenGL Version to console
version := gl.GoStr(gl.GetString(gl.VERSION))
fmt.Println("OpenGL Version", version, "\n\n")
//keyboard input callback
window.SetKeyCallback(onKey)
/* **************************************************** */
previousTime := glfw.GetTime()
totalTime := 0.0000
/* ******************* MAIN LOOP ******************** */
for !window.ShouldClose() {
glfw.PollEvents()
//Update
time := glfw.GetTime()
elapsed := time - previousTime
previousTime = time
totalTime = totalTime + elapsed
//get current head state
state := C.ovrHmd_GetTrackingState(hmd, 0)
orientation := state.HeadPose.ThePose.Orientation
//convert to go type float32
var q mgl32.Quat
q.W = (float32)(orientation.w)
q.V[0] = (float32)(orientation.x)
q.V[1] = (float32)(orientation.y)
q.V[2] = (float32)(orientation.z)
//publish tracking information once a second
if totalTime >= 1 {
fmt.Printf("w: %f X: %f Y: %f Z: %f\n", q.W, q.X(), q.Y(), q.Z())
totalTime = 0
}
//basic opengl things
draw(window)
//Swap buffers
window.SwapBuffers()
//Poll for events (keyboard, resize, etc)
}
/* ***************** OVR SHUTDOWN ******************** */
C.ovrHmd_Destroy(hmd)
C.ovr_Shutdown()
}
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, 4)
glfw.WindowHint(glfw.ContextVersionMinor, 1)
glfw.WindowHint(glfw.OpenGLProfile, glfw.OpenGLCoreProfile)
glfw.WindowHint(glfw.OpenGLForwardCompatible, glfw.True)
window, err := glfw.CreateWindow(windowWidth, windowHeight, "Cube", nil, nil)
if err != nil {
panic(err)
}
window.MakeContextCurrent()
// Initialize Glow
if err := gl.Init(); err != nil {
panic(err)
}
version := gl.GoStr(gl.GetString(gl.VERSION))
fmt.Println("OpenGL version", version)
// Configure the vertex and fragment shaders
program, err := newProgram(vertexShader, fragmentShader)
if err != nil {
panic(err)
}
gl.UseProgram(program)
projection := mgl32.Perspective(mgl32.DegToRad(45.0), float32(windowWidth)/windowHeight, 0.1, 10.0)
projectionUniform := gl.GetUniformLocation(program, gl.Str("projection\x00"))
gl.UniformMatrix4fv(projectionUniform, 1, false, &projection[0])
camera := mgl32.LookAtV(mgl32.Vec3{3, 3, 3}, mgl32.Vec3{0, 0, 0}, mgl32.Vec3{0, 1, 0})
cameraUniform := gl.GetUniformLocation(program, gl.Str("camera\x00"))
gl.UniformMatrix4fv(cameraUniform, 1, false, &camera[0])
model := mgl32.Ident4()
modelUniform := gl.GetUniformLocation(program, gl.Str("model\x00"))
gl.UniformMatrix4fv(modelUniform, 1, false, &model[0])
textureUniform := gl.GetUniformLocation(program, gl.Str("tex\x00"))
gl.Uniform1i(textureUniform, 0)
gl.BindFragDataLocation(program, 0, gl.Str("outputColor\x00"))
// Load the texture
texture, err := newTexture("square.png")
if err != nil {
panic(err)
}
// Configure the vertex data
var vao uint32
gl.GenVertexArrays(1, &vao)
gl.BindVertexArray(vao)
var vbo uint32
gl.GenBuffers(1, &vbo)
gl.BindBuffer(gl.ARRAY_BUFFER, vbo)
gl.BufferData(gl.ARRAY_BUFFER, len(cubeVertices)*4, gl.Ptr(cubeVertices), gl.STATIC_DRAW)
vertAttrib := uint32(gl.GetAttribLocation(program, gl.Str("vert\x00")))
gl.EnableVertexAttribArray(vertAttrib)
gl.VertexAttribPointer(vertAttrib, 3, gl.FLOAT, false, 5*4, gl.PtrOffset(0))
texCoordAttrib := uint32(gl.GetAttribLocation(program, gl.Str("vertTexCoord\x00")))
gl.EnableVertexAttribArray(texCoordAttrib)
gl.VertexAttribPointer(texCoordAttrib, 2, gl.FLOAT, false, 5*4, gl.PtrOffset(3*4))
// Configure global settings
gl.Enable(gl.DEPTH_TEST)
gl.DepthFunc(gl.LESS)
gl.ClearColor(1.0, 1.0, 1.0, 1.0)
angle := 0.0
previousTime := glfw.GetTime()
for !window.ShouldClose() {
gl.Clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT)
// Update
time := glfw.GetTime()
elapsed := time - previousTime
previousTime = time
angle += elapsed
model = mgl32.HomogRotate3D(float32(angle), mgl32.Vec3{0, 1, 0})
// Render
gl.UseProgram(program)
gl.UniformMatrix4fv(modelUniform, 1, false, &model[0])
gl.BindVertexArray(vao)
gl.ActiveTexture(gl.TEXTURE0)
gl.BindTexture(gl.TEXTURE_2D, texture)
gl.DrawArrays(gl.TRIANGLES, 0, 6*2*3)
// Maintenance
window.SwapBuffers()
glfw.PollEvents()
}
}
func Main() {
err := glfw.Init()
if err != nil {
panic(err)
}
defer glfw.Terminate()
glfw.WindowHint(glfw.Resizable, glfw.False)
glfw.WindowHint(glfw.ContextVersionMajor, 3)
glfw.WindowHint(glfw.ContextVersionMinor, 2)
glfw.WindowHint(glfw.OpenGLProfile, glfw.OpenGLCoreProfile)
glfw.WindowHint(glfw.OpenGLForwardCompatible, glfw.True)
window, err := glfw.CreateWindow(WindowWidth, WindowHeight, "Cube", nil, nil)
Window = window
if err != nil {
panic(err)
}
window.MakeContextCurrent()
// Initialize Glow
if err := gl.Init(); err != nil {
panic(err)
}
version := gl.GoStr(gl.GetString(gl.VERSION))
fmt.Println("OpenGL version", version)
// Configure the vertex and fragment shaders
program, err := newProgram("SimpleVertexShader.vertexshader", "SimpleFragmentShader.fragmentshader")
if err != nil {
panic(err)
}
gl.UseProgram(program)
projection := mgl32.Perspective(mgl32.DegToRad(45.0), float32(WindowWidth)/WindowHeight, 0.1, 10.0)
projectionUniform := gl.GetUniformLocation(program, gl.Str("projection\x00"))
gl.UniformMatrix4fv(projectionUniform, 1, false, &projection[0])
camera := mgl32.LookAtV(mgl32.Vec3{3, 3, 3}, mgl32.Vec3{0, 0, 0}, mgl32.Vec3{0, 1, 0})
cameraUniform := gl.GetUniformLocation(program, gl.Str("camera\x00"))
gl.UniformMatrix4fv(cameraUniform, 1, false, &camera[0])
model := mgl32.Ident4()
modelUniform := gl.GetUniformLocation(program, gl.Str("model\x00"))
gl.UniformMatrix4fv(modelUniform, 1, false, &model[0])
textureUniform := gl.GetUniformLocation(program, gl.Str("tex\x00"))
gl.Uniform1i(textureUniform, 0)
gl.BindFragDataLocation(program, 0, gl.Str("outputColor\x00"))
// Configure global settings
gl.Enable(gl.DEPTH_TEST)
gl.DepthFunc(gl.LESS)
gl.ClearColor(1.0, 1.0, 1.0, 1.0)
angle := 0.0
previousTime := glfw.GetTime()
width, height := window.GetSize()
window.SetCursorPos(float64(width/2), float64(height/2))
window.SetKeyCallback(input.OnKey)
window.SetCursorPosCallback(input.OnCursor)
window.SetMouseButtonCallback(input.OnMouse)
meshes.LoadColladaCube("cube.dae")
for !player.ShouldClose {
gl.Clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT)
// Update
time := glfw.GetTime()
elapsed := time - previousTime
previousTime = time
angle += elapsed
model = mgl32.HomogRotate3D(float32(angle), mgl32.Vec3{0, 1, 0})
// Render
gl.UseProgram(program)
// gl.UniformMatrix4fv(modelUniform, 1, false, &model[0])
player.MainPlayer.Draw(program)
for _, element := range game.Universe {
(element).Draw(program)
}
// Maintenance
window.SwapBuffers()
glfw.PollEvents()
}
}
func printOpenGlVersionInfo() {
fmt.Printf("%s\n", gl.GoStr(gl.GetString(gl.RENDERER)))
fmt.Printf("%s\n", gl.GoStr(gl.GetString(gl.VERSION)))
}