func RegisterShader(name string, vertex, fragment []byte) error {
if _, ok := shader_progs[name]; ok {
return fmt.Errorf("Tried to register a shader called '%s' twice", name)
}
vertex_id := gl.CreateShader(gl.VERTEX_SHADER)
pointer := &vertex[0]
length := int32(len(vertex))
gl.ShaderSource(vertex_id, 1, (**uint8)(unsafe.Pointer(&pointer)), &length)
gl.CompileShader(vertex_id)
var param int32
gl.GetShaderiv(vertex_id, gl.COMPILE_STATUS, ¶m)
if param == 0 {
buf := make([]byte, 5*1024)
var length int32
gl.GetShaderInfoLog(vertex_id, int32(len(buf)), &length, (*uint8)(unsafe.Pointer(&buf[0])))
if length > 0 {
length--
}
maxVersion := gl.GoStr(gl.GetString(gl.SHADING_LANGUAGE_VERSION))
return fmt.Errorf("Failed to compile vertex shader (max version supported: %q) %q: %q", maxVersion, name, buf[0:int(length)])
}
fragment_id := gl.CreateShader(gl.FRAGMENT_SHADER)
pointer = &fragment[0]
length = int32(len(fragment))
gl.ShaderSource(fragment_id, 1, (**uint8)(unsafe.Pointer(&pointer)), &length)
gl.CompileShader(fragment_id)
gl.GetShaderiv(fragment_id, gl.COMPILE_STATUS, ¶m)
if param == 0 {
buf := make([]byte, 5*1024)
var length int32
gl.GetShaderInfoLog(fragment_id, int32(len(buf)), &length, (*uint8)(unsafe.Pointer(&buf[0])))
if length > 0 {
length--
}
maxVersion := gl.GoStr(gl.GetString(gl.SHADING_LANGUAGE_VERSION))
return fmt.Errorf("Failed to compile fragment shader (max version supported: %q) %q: %q", maxVersion, name, buf[0:int(length)])
}
// shader successfully compiled - now link
program_id := gl.CreateProgram()
gl.AttachShader(program_id, vertex_id)
gl.AttachShader(program_id, fragment_id)
gl.LinkProgram(program_id)
gl.GetProgramiv(program_id, gl.LINK_STATUS, ¶m)
if param == 0 {
return fmt.Errorf("Failed to link shader '%s': %v", name, param)
}
shader_progs[name] = program_id
return nil
}
func Run(g *Game) error {
if g.Scene == nil {
return fmt.Errorf("Scene property of given Game struct is empty")
}
// GLFW event handling must run on the main OS thread
runtime.LockOSThread()
if err := glfw.Init(); err != nil {
return fmt.Errorf("glfw.Init failed: %s", err)
}
defer glfw.Terminate()
glfw.WindowHint(glfw.ContextVersionMajor, OpenGLVerMinor)
glfw.WindowHint(glfw.ContextVersionMinor, OpenGLVerMinor)
glfw.WindowHint(glfw.Resizable, glfw.False)
if g.Resizable {
glfw.WindowHint(glfw.Resizable, glfw.True)
}
glfw.WindowHint(glfw.OpenGLProfile, glfw.OpenGLCoreProfile)
glfw.WindowHint(glfw.OpenGLForwardCompatible, glfw.True)
window, err := glfw.CreateWindow(int(g.Width), int(g.Height), g.Title, nil, nil)
if err != nil {
return fmt.Errorf("glfw.CreateWindow failed: %s", err)
}
window.MakeContextCurrent()
// Initialize Glow
if err := gl.Init(); err != nil {
return fmt.Errorf("gl.Init failed:", err)
}
version := gl.GoStr(gl.GetString(gl.VERSION))
log.Println("gl.Init successful, OpenGL version:", version)
var previousTime, deltaTime, time float32
previousTime = float32(glfw.GetTime()) - 1.0/60.0
g.Scene.Setup()
for !window.ShouldClose() {
time = float32(glfw.GetTime())
deltaTime = time - previousTime
glfw.PollEvents()
gl.ClearColor(0.2, 0.3, 0.3, 0.5)
gl.Clear(gl.COLOR_BUFFER_BIT)
g.Scene.Update(deltaTime)
g.Scene.Draw(deltaTime)
previousTime = time
window.SwapBuffers()
}
return nil
}
// Probe probes the video card and return a struct of specifications for it
func Probe() CardSpecs {
cs := CardSpecs{}
gl.GetIntegerv(gl.MAX_TEXTURE_SIZE, &cs.MaxTextureSize)
gl.GetIntegerv(gl.MAX_TEXTURE_IMAGE_UNITS, &cs.MaxTextureImageUnits)
cs.ShaderVersion = gl.GoStr((gl.GetString(gl.SHADING_LANGUAGE_VERSION)))
return cs
}
// createWindow initializes the graphics libraries and creates the main window for the game.
// it pulls the settings for the window from the options structure passed in.
func createWindow(options *Options) (*glfw.Window, error) {
// GLFW must be initialized before it's called
err := glfw.Init()
if err != nil {
return nil, fmt.Errorf("Can't init glfw! %v", err)
}
// request a OpenGL 3.3 core context
glfw.WindowHint(glfw.Samples, 0)
glfw.WindowHint(glfw.ContextVersionMajor, 3)
glfw.WindowHint(glfw.ContextVersionMinor, 3)
glfw.WindowHint(glfw.OpenGLForwardCompatible, glfw.True)
glfw.WindowHint(glfw.OpenGLProfile, glfw.OpenGLCoreProfile)
// do the actual window creation
mainWindow, err := glfw.CreateWindow(options.WindowWidth, options.WindowHeight, appWindowName, nil, nil)
if err != nil {
return nil, fmt.Errorf("Failed to create the main window! %v", err)
}
mainWindow.MakeContextCurrent()
// set vsync options
if options.VSyncEnabled {
glfw.SwapInterval(1)
} else {
glfw.SwapInterval(0)
}
// make sure that all of the GL functions are initialized
err = gl.Init()
if err != nil {
return nil, fmt.Errorf("Can't init gl! %v", err)
}
// write out the gl version for debug purposes
version := gl.GoStr(gl.GetString(gl.VERSION))
groggy.Log("INFO", "OpenGL version ", version)
return mainWindow, nil
}
func (c *Context) CreateWindow(w, h int, name string) (err error) {
c.w = w
c.h = h
c.name = name
c.createWindow()
c.SetCursor(c.cursor)
gl.Init()
if e := gl.GetError(); e != 0 {
if e != gl.INVALID_ENUM {
err = fmt.Errorf("OpenGL glInit error: %X\n", e)
return
}
}
c.OpenGLVersion = glfw.GetVersionString()
c.ShaderVersion = gl.GoStr(gl.GetString(gl.SHADING_LANGUAGE_VERSION))
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.Disable(gl.CULL_FACE)
glfw.SwapInterval(1)
return
}
// Initializing the game and set of assets.
func initialize() (*glfw.Window, *Assets, error) {
if err := glfw.Init(); err != nil {
return nil, nil, err
}
// Setting up a bunch of windowing stuff with GLFW.
glfw.WindowHint(glfw.Resizable, glfw.False)
glfw.WindowHint(glfw.ContextVersionMajor, 3)
glfw.WindowHint(glfw.ContextVersionMinor, 3)
glfw.WindowHint(glfw.OpenGLProfile, glfw.OpenGLCoreProfile)
glfw.WindowHint(glfw.OpenGLForwardCompatible, glfw.True)
// Creating GLFW.
window, err := glfw.CreateWindow(640, 480, "Testing", nil, nil)
if err != nil {
return nil, nil, err
}
// Creating OpenGL.
window.MakeContextCurrent()
if err := gl.Init(); err != nil {
return nil, nil, err
}
gl.ClearColor(0.3, 0.3, 0.3, 1.0)
if config.DebugMode {
version := gl.GoStr(gl.GetString(gl.VERSION))
fmt.Println("Running on OpenGL: " + version)
}
// Loading assets.
assets, err := NewAssets([]string{"res/shaders/texrenderer"}, []string{"res/textures/texture.jpg"})
if err != nil {
return nil, nil, err
}
return window, assets, nil
}
func (c *Context) CreateWindow(w, h int, name string) (err error) {
c.w = w
c.h = h
c.name = name
var monitor *glfw.Monitor
if c.fullscreen == true {
monitor = glfw.GetPrimaryMonitor()
}
if c.window, err = glfw.CreateWindow(c.w, c.h, c.name, monitor, nil); err != nil {
return
}
if c.cursor == false {
c.window.SetInputMode(glfw.CursorMode, glfw.CursorHidden)
}
c.window.MakeContextCurrent()
gl.Init()
if e := gl.GetError(); e != 0 {
if e == gl.INVALID_ENUM {
fmt.Printf("GL_INVALID_ENUM when calling glInit\n")
} else {
err = fmt.Errorf("OpenGL glInit error: %X\n", e)
return
}
}
c.OpenGLVersion = glfw.GetVersionString()
c.ShaderVersion = gl.GoStr(gl.GetString(gl.SHADING_LANGUAGE_VERSION))
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.Disable(gl.CULL_FACE)
glfw.SwapInterval(1)
if c.VAO, err = CreateVAO(); err != nil {
return
}
gl.BindVertexArray(c.VAO)
c.Events = NewEventHandler(c.window)
return
}
func main() {
// init glfw
if err := glfw.Init(); err != nil {
panic(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)
// make an application window
window, err := glfw.CreateWindow(windowWidth, windowHeight, "Hello", nil, nil)
if err != nil {
panic(err)
}
window.MakeContextCurrent()
// init gl
if err := gl.Init(); err != nil {
panic(err)
}
fmt.Println("OpenGL version", gl.GoStr(gl.GetString(gl.VERSION)))
// create vertex & fragment shader
program, err := newProgram(vertexShader, fragmentShader)
if err != nil {
panic(err)
}
gl.UseProgram(program)
gl.BindFragDataLocation(program, 0, gl.Str("fc\x00"))
points := []float32{
-0.5, -0.5,
0.5, 0.5,
0.5, -0.5,
-0.5, 0.5,
}
vertices := []uint32{
0, 2, 1, 3,
}
// configure the vertex data
var vao uint32
gl.GenVertexArrays(1, &vao)
gl.BindVertexArray(vao)
defer gl.BindVertexArray(0)
var vbo uint32
gl.GenBuffers(1, &vbo)
gl.BindBuffer(gl.ARRAY_BUFFER, vbo)
gl.BufferData(gl.ARRAY_BUFFER, len(points)*4, gl.Ptr(points), gl.STATIC_DRAW)
var ibo uint32
gl.GenBuffers(1, &ibo)
gl.BindBuffer(gl.ELEMENT_ARRAY_BUFFER, ibo)
gl.BufferData(gl.ELEMENT_ARRAY_BUFFER, len(vertices)*4, gl.Ptr(vertices), gl.STATIC_DRAW)
vertAttrib := uint32(gl.GetAttribLocation(program, gl.Str("pv\x00")))
gl.EnableVertexAttribArray(vertAttrib)
gl.VertexAttribPointer(vertAttrib, 2, gl.FLOAT, false, 2*4, gl.PtrOffset(0))
// global settings
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)
gl.UseProgram(program)
gl.BindVertexArray(vao)
gl.DrawElements(gl.LINE_LOOP, 4, gl.UNSIGNED_INT, gl.PtrOffset(0))
window.SwapBuffers()
glfw.PollEvents()
}
}
func Init() error {
if err := gl.Init(); err != nil {
return err
}
log.Printf("OpenGL version: %s", gl.GoStr(gl.GetString(gl.VERSION)))
vs, err := asset.String("shader.vert")
if err != nil {
return err
}
fs, err := asset.String("shader.frag")
if err != nil {
return err
}
program, err := createProgram(vs, fs)
if err != nil {
return err
}
gl.UseProgram(program)
var shaderErr error
uniform := func(name string) int32 {
var loc int32
loc, shaderErr = getUniformLocation(program, name)
return loc
}
projectionViewMatrixUniform = uniform("u_projectionViewMatrix")
modelMatrixUniform = uniform("u_modelMatrix")
normalMatrixUniform = uniform("u_normalMatrix")
ambientLightColorUniform = uniform("u_ambientLightColor")
directionalLightColorUniform = uniform("u_directionalLightColor")
directionalVectorUniform = uniform("u_directionalVector")
textureUniform = uniform("u_texture")
grayscaleUniform = uniform("u_grayscale")
brightnessUniform = uniform("u_brightness")
alphaUniform = uniform("u_alpha")
mixColorUniform = uniform("u_mixColor")
mixAmountUniform = uniform("u_mixAmount")
if shaderErr != nil {
return shaderErr
}
vm := newViewMatrix(cameraPosition, targetPosition, up)
nm := vm.inverse().transpose()
gl.UniformMatrix4fv(normalMatrixUniform, 1, false, &nm[0])
gl.Uniform3fv(ambientLightColorUniform, 1, &ambientLightColor[0])
gl.Uniform3fv(directionalLightColorUniform, 1, &directionalLightColor[0])
gl.Uniform3fv(directionalVectorUniform, 1, &directionalVector[0])
SizeCallback = func(width, height int) {
if winWidth == width && winHeight == height {
return
}
log.Printf("window size changed (%dx%d -> %dx%d)", int(winWidth), int(winHeight), width, height)
gl.Viewport(0, 0, int32(width), int32(height))
// Calculate new perspective projection view matrix.
winWidth, winHeight = width, height
fw, fh := float32(width), float32(height)
aspect := fw / fh
fovRadians := float32(math.Pi) / 3
perspectiveProjectionViewMatrix = vm.mult(newPerspectiveMatrix(fovRadians, aspect, 1, 2000))
// Calculate new ortho projection view matrix.
orthoProjectionViewMatrix = newOrthoMatrix(fw, fh, fw /* use width as depth */)
}
if err := initMeshes(); err != nil {
return err
}
if err := initTextures(); err != nil {
return err
}
gl.Enable(gl.CULL_FACE)
gl.CullFace(gl.BACK)
gl.Enable(gl.DEPTH_TEST)
gl.DepthFunc(gl.LESS)
gl.Enable(gl.BLEND)
gl.BlendFunc(gl.SRC_ALPHA, gl.ONE_MINUS_SRC_ALPHA)
gl.ClearColor(0, 0, 0, 0)
return nil
}
func InitGL() error {
defer tlog.FuncLog(tlog.Func("InitGL"))
err := gl.Init()
if err != nil {
return err
}
gl.GetError() // cleanup gl error state
version := gl.GoStr(gl.GetString(gl.VERSION))
tlog.Println("OpenGL version", version)
gl.PolygonMode(gl.FRONT_AND_BACK, gl.FILL)
Check()
gl.ReadBuffer(gl.BACK)
Check()
gl.DrawBuffer(gl.BACK)
Check()
gl.FrontFace(gl.CW)
Check()
gl.CullFace(gl.BACK)
Check()
gl.Disable(gl.CULL_FACE)
Check()
gl.ClearColor(1, 1, 0.5, 0)
Check()
gl.ClearDepth(1.0)
Check()
gl.ClearStencil(0)
Check()
gl.Disable(gl.STENCIL_TEST)
Check()
gl.StencilMask(0xFFFFFFFF)
Check()
gl.StencilFunc(gl.EQUAL, 0x00000000, 0x00000001)
Check()
gl.StencilOp(gl.KEEP, gl.KEEP, gl.KEEP)
Check()
gl.Disable(gl.DITHER)
Check()
gl.Enable(gl.DEPTH_TEST)
Check()
gl.DepthFunc(gl.LEQUAL)
Check()
gl.DepthMask(true)
Check()
gl.DepthRange(0., 1.)
Check()
gl.Enable(gl.DEPTH_CLAMP)
Check()
gl.Enable(gl.BLEND)
Check()
gl.BlendFunc(gl.SRC_ALPHA, gl.ONE_MINUS_SRC_ALPHA)
ForceCheck()
return nil
}
func main() {
// init glfw
if err := glfw.Init(); err != nil {
panic(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)
// make an application window
window, err := glfw.CreateWindow(windowWidth, windowHeight, "Transform", nil, nil)
if err != nil {
panic(err)
}
window.MakeContextCurrent()
// init gl
if err := gl.Init(); err != nil {
panic(err)
}
fmt.Println("OpenGL version", gl.GoStr(gl.GetString(gl.VERSION)))
// create vertex & fragment shader
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])
gl.BindFragDataLocation(program, 0, gl.Str("vert\x00"))
points := []float32{
-0.9, -0.9, -0.9,
0.9, -0.9, -0.9,
0.9, -0.9, 0.9,
-0.9, -0.9, 0.9,
-0.9, 0.9, -0.9,
0.9, 0.9, -0.9,
0.9, 0.9, 0.9,
-0.9, 0.9, 0.9,
}
vertices := []uint32{
0, 1,
1, 2,
2, 3,
3, 0,
0, 4,
1, 5,
2, 6,
3, 7,
4, 5,
5, 6,
6, 7,
7, 4,
}
// configure the vertex data
var vao uint32
gl.GenVertexArrays(1, &vao)
gl.BindVertexArray(vao)
defer gl.BindVertexArray(0)
var vbo uint32
gl.GenBuffers(1, &vbo)
gl.BindBuffer(gl.ARRAY_BUFFER, vbo)
gl.BufferData(gl.ARRAY_BUFFER, len(points)*4, gl.Ptr(points), gl.STATIC_DRAW)
var ibo uint32
gl.GenBuffers(1, &ibo)
gl.BindBuffer(gl.ELEMENT_ARRAY_BUFFER, ibo)
gl.BufferData(gl.ELEMENT_ARRAY_BUFFER, len(vertices)*4, gl.Ptr(vertices), gl.STATIC_DRAW)
vertAttrib := uint32(gl.GetAttribLocation(program, gl.Str("vert\x00")))
gl.EnableVertexAttribArray(vertAttrib)
gl.VertexAttribPointer(vertAttrib, 3, gl.FLOAT, false, 3*4, gl.PtrOffset(0))
// global settings
gl.Enable(gl.DEPTH_TEST)
gl.DepthFunc(gl.LESS)
gl.ClearColor(0.0, 0.0, 0.0, 1.0)
angleX := 0.0
angleY := 0.0
angleZ := 0.0
previousTime := glfw.GetTime()
for !window.ShouldClose() {
gl.Clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT)
time := glfw.GetTime()
elapsed := time - previousTime
previousTime = time
angleX += math.Sin((elapsed / period) * math.Pi * 2.0)
angleY += math.Sin((elapsed / period) / 6.0 * math.Pi * 2.0)
angleZ += math.Sin((elapsed / period) / 3.0 * math.Pi * 2.0)
model = mgl32.HomogRotate3DY(float32(angleY)).Mul4(mgl32.HomogRotate3DX(float32(angleX))).Mul4(mgl32.HomogRotate3DZ(float32(angleZ)))
gl.UseProgram(program)
gl.UniformMatrix4fv(modelUniform, 1, false, &model[0])
gl.BindVertexArray(vao)
gl.DrawElements(gl.LINES, int32(len(vertices)), gl.UNSIGNED_INT, gl.PtrOffset(0))
window.SwapBuffers()
glfw.PollEvents()
}
}