// renders the display on each update
func render() {
gl.Clear(gl.COLOR_BUFFER_BIT)
gl.Enable(gl.BLEND)
gl.Enable(gl.POINT_SMOOTH)
gl.Enable(gl.LINE_SMOOTH)
gl.BlendFunc(gl.SRC_ALPHA, gl.ONE_MINUS_SRC_ALPHA)
gl.LoadIdentity()
// draw pipes
for _, pipeBox := range pipe {
gl.PushMatrix()
pos := pipeBox.Body.Position()
gl.Translatef(float32(pos.X), float32(pos.Y), 0.0)
drawSquare(.19, .8, .19, 1) // limegreen
gl.PopMatrix()
}
// draw flappy
for _, flappyBird := range flappyBirds {
gl.PushMatrix()
pos := flappyBird.Body.Position()
gl.Translatef(float32(pos.X), float32(pos.Y), 0.0)
drawSquare(1, .84, 0, 1) // gold
gl.PopMatrix()
}
gl.Color4f(1, 0, 1, 1)
scoreStr := "[ Score: " + strconv.Itoa(score) + " ]"
// draw score
drawScore(scoreStr)
}
//Call this function once to enable debug print message (to stdout). Will not crash if your machine does not support GL_ARB_debug_output
func EnableGLDebugLogging() {
if lux.Extensions["GL_ARB_debug_output"] {
log.Print("debugging enabled")
gl.Enable(gl.DEBUG_OUTPUT_SYNCHRONOUS_ARB)
gl.DebugMessageCallbackARB(gl.DebugProc(glDebugCallback), gl.Ptr(nil))
}
}
func (t *Text) Draw() {
if t.IsDebug {
t.BoundingBox.Draw()
}
gl.UseProgram(t.font.program)
gl.ActiveTexture(gl.TEXTURE0)
gl.BindTexture(gl.TEXTURE_2D, t.font.textureID)
// uniforms
gl.Uniform1i(t.font.fragmentTextureUniform, 0)
gl.Uniform4fv(t.font.colorUniform, 1, &t.color[0])
gl.Uniform2fv(t.font.finalPositionUniform, 1, &t.finalPosition[0])
gl.UniformMatrix4fv(t.font.orthographicMatrixUniform, 1, false, &t.font.OrthographicMatrix[0])
gl.UniformMatrix4fv(t.font.scaleMatrixUniform, 1, false, &t.scaleMatrix[0])
// draw
drawCount := int32(t.RuneCount * 6)
if drawCount > int32(t.eboIndexCount) {
drawCount = int32(t.eboIndexCount)
}
if drawCount < 0 {
drawCount = 0
}
gl.Enable(gl.BLEND)
gl.BlendFunc(gl.SRC_ALPHA, gl.ONE_MINUS_SRC_ALPHA)
gl.BindVertexArray(t.vao)
gl.DrawElements(gl.TRIANGLES, drawCount, gl.UNSIGNED_INT, nil)
gl.BindVertexArray(0)
gl.Disable(gl.BLEND)
}
// InitGraphics creates an OpenGL window and initializes the required graphics libraries.
// It will either succeed or panic.
func (app *ExampleApp) InitGraphics(title string, w int, h int) {
err := glfw.Init()
if err != nil {
panic("Can't init glfw! " + err.Error())
}
// 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
app.MainWindow, err = glfw.CreateWindow(w, h, title, nil, nil)
if err != nil {
panic("Failed to create the main window! " + err.Error())
}
app.MainWindow.MakeContextCurrent()
glfw.SwapInterval(0)
// make sure that all of the GL functions are initialized
err = gl.Init()
if err != nil {
panic("Failed to initialize GL! " + err.Error())
}
// set the app window dimensions
app.Width = w
app.Height = h
gl.FrontFace(gl.CCW)
gl.CullFace(gl.BACK)
gl.Enable(gl.CULL_FACE)
}
func SetPerspective(width, height int) {
Projection := mathgl.Perspective(mathgl.DegToRad(45.0), float32(width/height), 0.1, 100.0)
viewM = mathgl.LookAt(0.0, 0.0, 20.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0)
projectionM = Projection
gl.Disable(gl.CULL_FACE)
gl.Enable(gl.DEPTH_TEST)
}
// createRenderer creates a new graphics Renderer engine and does
// any initializiation necessary.
//
// NOTE: in the future, this can create either a forward or deferred
// renderer with more advanced options.
func createRenderer(mainWindow *glfw.Window) (*GameRenderer, error) {
gr := new(GameRenderer)
gr.Shaders = make(map[string]*fizzle.RenderShader)
// create the renderer itself
windowW, windowH := mainWindow.GetFramebufferSize()
forwardRenderer := fizzle.NewForwardRenderer(mainWindow)
forwardRenderer.Init(int32(windowW), int32(windowH))
gr.Renderer = forwardRenderer
gr.MainWindow = mainWindow
// load the landscape diffuse shader
shader, err := fizzle.LoadShaderProgramFromFiles(landscapeShaderPath, nil)
if err != nil {
return nil, fmt.Errorf("Failed to compile and link the diffuse shader program!\n%v", err)
}
gr.Shaders["landscape"] = shader
// load the diffuse shader
shader, err = fizzle.LoadShaderProgramFromFiles(diffuseShaderPath, nil)
if err != nil {
return nil, fmt.Errorf("Failed to compile and link the diffuse shader program!\n%v", err)
}
gr.Shaders["diffuse"] = shader
// put a test light in the renderer
light := fizzle.NewLight()
//light.Position = mgl.Vec3{8.0, 8.0, 8.0}
light.DiffuseColor = mgl.Vec4{1.0, 1.0, 1.0, 1.0}
light.Direction = mgl.Vec3{0.1, -1.0, -0.1}
light.DiffuseIntensity = 0.6
light.AmbientIntensity = 0.4
//light.Attenuation = 1.0
forwardRenderer.ActiveLights[0] = light
// setup the camera to look at the cube
gr.camera = fizzle.NewOrbitCamera(mgl.Vec3{0.0, 0.0, 0.0}, mgl.DegToRad(35.0), 16.0, mgl.DegToRad(90.0))
// set some OpenGL flags
gl.Enable(gl.CULL_FACE)
gl.Enable(gl.DEPTH_TEST)
return gr, nil
}
func (r *EffectsRenderer) Bind() error {
gl.BindFramebuffer(gl.FRAMEBUFFER, r.framebuffer)
gl.Enable(gl.STENCIL_TEST)
gl.Viewport(0, 0, int32(r.width), int32(r.height))
gl.ClearStencil(0)
gl.ClearColor(0.0, 0.0, 0.0, 0.0)
gl.StencilMask(0xFF) // Write to buffer
gl.Clear(gl.COLOR_BUFFER_BIT | gl.STENCIL_BUFFER_BIT)
gl.StencilMask(0x00) // Don't write to buffer
return nil
}
func main() {
app = NewApp()
app.InitGraphics("Cube Drop", 800, 600)
app.SetKeyCallback(keyCallback)
app.OnRender = renderCallback
app.OnUpdate = updateCallback
defer app.Terminate()
// compile the shaders
var err error
diffuseShader, err = LoadShaderProgram(DiffuseTextureVertShader, DiffuseTextureFragShader)
if err != nil {
panic("Failed to compile the diffuse shader! " + err.Error())
}
// setup the slice of cubes to render
cubes = make([]*Entity, 0, 128)
// load the grass texture for the ground
grassTex, err := LoadImageToTexture(grassTexturePath)
if err != nil {
panic("Failed to load the grass texture! " + err.Error())
}
// load the crate texture for the cubes
crateTexture, err = LoadImageToTexture(crateTexturePath)
if err != nil {
panic("Failed to load the crate texture! " + err.Error())
}
// create the ground plane
groundPlane = cubez.NewCollisionPlane(m.Vector3{0.0, 1.0, 0.0}, 0.0)
// make a ground plane to draw
ground = CreatePlaneXZ(-500.0, 500.0, 500.0, -500.0, 64.0)
ground.Shader = diffuseShader
ground.Color = mgl.Vec4{1.0, 1.0, 1.0, 1.0}
ground.Tex0 = grassTex
// setup the camera
app.CameraPos = mgl.Vec3{0.0, 3.0, 10.0}
app.CameraRotation = mgl.QuatLookAtV(
mgl.Vec3{0.0, 5.0, 10.0},
mgl.Vec3{0.0, 0.0, 0.0},
mgl.Vec3{0.0, 1.0, 0.0})
gl.Enable(gl.DEPTH_TEST)
app.RenderLoop()
}
func CreateBuffers() {
var err error
program, err = MakeProgram(VertexShader(), FragmentShader())
// defer program.Delete()
if err != nil {
fmt.Println("Error loading shaders: " + err.Error())
panic("error loading shaders")
}
gl.BindFragDataLocation(program, 0, gl.Str("color\x00"))
MVPid = gl.GetUniformLocation(program, gl.Str("MVP\x00"))
lightpositionID = gl.GetUniformLocation(program, gl.Str("light.position\x00"))
lightintensitiesID = gl.GetUniformLocation(program, gl.Str("light.intensities\x00"))
lightattenuationID = gl.GetUniformLocation(program, gl.Str("light.attenuation\x00"))
lightambientCoeficientID = gl.GetUniformLocation(program, gl.Str("light.ambientCoeficient\x00"))
cameraPositionID = gl.GetUniformLocation(program, gl.Str("cameraPosition\x00"))
// View := mathgl.LookAt(0.0, 0.0, 5.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0)
// viewM = View
gl.DepthFunc(gl.LEQUAL)
gl.Enable(gl.BLEND)
gl.BlendFunc(gl.SRC_ALPHA, gl.ONE_MINUS_SRC_ALPHA)
// var vao uint32
gl.GenVertexArrays(1, &vao)
gl.BindVertexArray(vao)
// var vbo uint32
gl.GenBuffers(1, &vbo)
// gl.GenBuffers(1, &elementvbo)
// fmt.Println(program)
gl.UseProgram(program)
for idx, img := range aggregateImages {
bindAggregateImage(img, idx)
}
}
func (ps *ParticleSystem) Render(delta float64, VP glm.Mat4, camera glm.Vec3) {
ps.time += delta
//do update
ps.gTime.Uniform1f(float32(ps.time) * 1000)
ps.gDeltaTimeMillis.Uniform1f(float32(delta) * 1000)
//bind the rand texture
//m_randomTexture.Bind(RANDOM_TEXTURE_UNIT);
gl.Enable(gl.RASTERIZER_DISCARD)
ps.buffers[ps.currentVB].Bind(gl.ARRAY_BUFFER)
ps.transformfeedbacks[ps.currentTFB].Bind()
gl.EnableVertexAttribArray(0)
gl.EnableVertexAttribArray(1)
gl.EnableVertexAttribArray(2)
gl.EnableVertexAttribArray(3)
gl.VertexAttribPointer(0, 1, gl.FLOAT, false, int32(unsafe.Sizeof(Particle{})), unsafe.Pointer(uintptr(0)))
gl.VertexAttribPointer(1, 3, gl.FLOAT, false, int32(unsafe.Sizeof(Particle{})), unsafe.Pointer(uintptr(4)))
gl.VertexAttribPointer(2, 3, gl.FLOAT, false, int32(unsafe.Sizeof(Particle{})), unsafe.Pointer(uintptr(16)))
gl.VertexAttribPointer(3, 1, gl.FLOAT, false, int32(unsafe.Sizeof(Particle{})), unsafe.Pointer(uintptr(28)))
gl.BeginTransformFeedback(gl.POINTS)
if ps.isFirst {
gl.DrawArrays(gl.POINTS, 0, 1)
ps.isFirst = false
} else {
gl.DrawTransformFeedback(gl.POINTS, uint32(ps.transformfeedbacks[ps.currentVB]))
}
gl.EndTransformFeedback()
gl.DisableVertexAttribArray(0)
gl.DisableVertexAttribArray(1)
gl.DisableVertexAttribArray(2)
gl.DisableVertexAttribArray(3)
//do render
ps.currentVB = ps.currentTFB
ps.currentTFB = (ps.currentTFB + 1) & 0x1
}
// RenderString must be called on the render thread. x and y are the initial position of the pen,
// in screen coordinates, and height is the height of a full line of text, in screen coordinates.
func (d *Dictionary) RenderString(str string, x, y, height float64) {
if str == "" {
return
}
// No synchronization necessary because everything is run serially on the render thread anyway.
if d.strs == nil {
d.strs = make(map[string]strData)
}
data, ok := d.strs[str]
if !ok {
data = d.bindString(str)
d.strs[str] = data
}
render.EnableShader("glop.font")
defer render.EnableShader("")
gl.ActiveTexture(gl.TEXTURE0)
gl.BindTexture(gl.TEXTURE_2D, d.atlas.texture)
location, _ := render.GetUniformLocation("glop.font", "tex")
gl.Uniform1i(location, 0)
gl.BindSampler(0, d.atlas.sampler)
location, _ = render.GetUniformLocation("glop.font", "height")
gl.Uniform1f(location, float32(height))
var viewport [4]int32
gl.GetIntegerv(gl.VIEWPORT, &viewport[0])
location, _ = render.GetUniformLocation("glop.font", "screen")
gl.Uniform2f(location, float32(viewport[2]), float32(viewport[3]))
location, _ = render.GetUniformLocation("glop.font", "pen")
gl.Uniform2f(location, float32(x)+float32(viewport[0]), float32(y)+float32(viewport[1]))
location, _ = render.GetUniformLocation("glop.font", "textColor")
gl.Uniform3f(location, d.color[0], d.color[1], d.color[2])
gl.Enable(gl.BLEND)
gl.BlendFunc(gl.SRC_ALPHA, gl.ONE_MINUS_SRC_ALPHA)
gl.BindVertexArray(data.varrays[0])
gl.DrawArrays(gl.TRIANGLES, 0, data.count)
}
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
}
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 CreateContext(width, height int) Context {
vertexShader := `
#version 330
uniform mat4 projection;
uniform mat4 camera;
uniform mat4 model;
in vec3 vert;
void main() {
gl_Position = projection * camera * model * vec4(vert, 1);
}
` + "\x00"
fragmentShader := `
#version 330
uniform vec4 color;
out vec4 outputColor;
void main() {
outputColor = color;
}
` + "\x00"
vertices := []float32{
0.0, 0.0, 0.0,
1.0, 0.0, 0.0,
1.0, 1.0, 0.0,
1.0, 1.0, 0.0,
0.0, 1.0, 0.0,
0.0, 0.0, 0.0,
}
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, 3)
glfw.WindowHint(glfw.ContextVersionMinor, 3)
glfw.WindowHint(glfw.OpenGLProfile, glfw.OpenGLCoreProfile)
glfw.WindowHint(glfw.OpenGLForwardCompatible, glfw.True)
window, err := glfw.CreateWindow(width, height, "OpenGL", nil, nil)
if err != nil {
panic(err)
}
window.MakeContextCurrent()
if err := gl.Init(); err != nil {
panic(err)
}
program, err := newProgram(vertexShader, fragmentShader)
if err != nil {
panic(err)
}
gl.UseProgram(program)
projection := mgl32.Ortho2D(0, 800, 0, 600)
projectionUniform := gl.GetUniformLocation(program, gl.Str("projection\x00"))
gl.UniformMatrix4fv(projectionUniform, 1, false, &projection[0])
camera := mgl32.LookAtV(mgl32.Vec3{0, 0, 0.5}, 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])
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(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))
gl.Enable(gl.DEPTH_TEST)
gl.DepthFunc(gl.LESS)
return Context{Window: window, program: program}
}
func main() {
vertices, normals := obj.Parse(os.Args[1])
// initialize GLFW
if err := glfw.Init(); err != nil {
panic(err)
}
defer glfw.Terminate()
// set opengl core profile 3.3
glfw.WindowHint(glfw.ContextVersionMajor, 3)
glfw.WindowHint(glfw.ContextVersionMinor, 3)
glfw.WindowHint(glfw.OpenGLProfile, glfw.OpenGLCoreProfile)
glfw.WindowHint(glfw.OpenGLForwardCompatible, glfw.True)
window, err := glfw.CreateWindow(640, 480, "GOpenGL", nil, nil)
if err != nil {
panic(err)
}
window.MakeContextCurrent()
// initialise OpenGL library
if err := gl.Init(); err != nil {
panic(err)
}
// link program from shaders
program, err := newProgram("vertex.glsl", "fragment.glsl")
if err != nil {
panic(err)
}
gl.UseProgram(program)
// vertex attribute object holds links between attributes and vbo
var vao uint32
gl.GenVertexArrays(1, &vao)
gl.BindVertexArray(vao)
// vertex buffer with per-vertex data
var vbo [2]uint32
gl.GenBuffers(2, &vbo[0])
// position data
gl.BindBuffer(gl.ARRAY_BUFFER, vbo[0])
gl.BufferData(gl.ARRAY_BUFFER, len(vertices)*4, gl.Ptr(vertices), gl.STATIC_DRAW)
// set up position attribute with layout of vertices
posAttrib := uint32(gl.GetAttribLocation(program, gl.Str("position\x00")))
gl.VertexAttribPointer(posAttrib, 3, gl.FLOAT, false, 3*4, gl.PtrOffset(0))
gl.EnableVertexAttribArray(posAttrib)
// normal data
gl.BindBuffer(gl.ARRAY_BUFFER, vbo[1])
gl.BufferData(gl.ARRAY_BUFFER, len(normals)*4, gl.Ptr(normals), gl.STATIC_DRAW)
normAttrib := uint32(gl.GetAttribLocation(program, gl.Str("normal\x00")))
gl.VertexAttribPointer(normAttrib, 3, gl.FLOAT, false, 3*4, gl.PtrOffset(0))
gl.EnableVertexAttribArray(normAttrib)
uniModel := gl.GetUniformLocation(program, gl.Str("model\x00"))
uniView := gl.GetUniformLocation(program, gl.Str("view\x00"))
uniProj := gl.GetUniformLocation(program, gl.Str("proj\x00"))
matView := mgl32.LookAt(2.0, 2.0, 2.0,
0.0, 0.0, 0.0,
0.0, 0.0, 1.0)
gl.UniformMatrix4fv(uniView, 1, false, &matView[0])
matProj := mgl32.Perspective(mgl32.DegToRad(45.0), 640.0/480.0, 1.0, 10.0)
gl.UniformMatrix4fv(uniProj, 1, false, &matProj[0])
uniLightDir := gl.GetUniformLocation(program, gl.Str("lightDir\x00"))
uniLightCol := gl.GetUniformLocation(program, gl.Str("lightCol\x00"))
gl.Uniform3f(uniLightDir, -0.5, 0.0, -1.0)
gl.Uniform3f(uniLightCol, 0.0, 0.5, 0.5)
startTime := glfw.GetTime()
gl.Enable(gl.DEPTH_TEST)
gl.ClearColor(1.0, 1.0, 1.0, 1.0)
for !window.ShouldClose() {
// clear buffer
gl.Clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT)
matRot := mgl32.HomogRotate3DZ(float32(glfw.GetTime() - startTime))
gl.UniformMatrix4fv(uniModel, 1, false, &matRot[0])
gl.DrawArrays(gl.TRIANGLES, 0, int32(len(vertices)))
window.SwapBuffers()
glfw.PollEvents()
}
}
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 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()
}
}
//PostRender renable depth test
func (ppfb *PostProcessFramebuffer) PostRender() {
gl.Enable(gl.DEPTH_TEST)
}
func main() {
app = NewApp()
app.InitGraphics("Ballistic", 800, 600)
app.SetKeyCallback(keyCallback)
app.OnRender = renderCallback
app.OnUpdate = updateCallback
defer app.Terminate()
// compile the shaders
var err error
colorShader, err = LoadShaderProgram(DiffuseColorVertShader, DiffuseColorFragShader)
if err != nil {
panic("Failed to compile the shader! " + err.Error())
}
// create the ground plane
groundPlane = cubez.NewCollisionPlane(m.Vector3{0.0, 1.0, 0.0}, 0.0)
// make a ground plane to draw
ground = CreatePlaneXZ(-500.0, 500.0, 500.0, -500.0, 1.0)
ground.Shader = colorShader
ground.Color = mgl.Vec4{0.6, 0.6, 0.6, 1.0}
// create a test cube to render
cubeNode := CreateCube(-1.0, -1.0, -1.0, 1.0, 1.0, 1.0)
cubeNode.Shader = colorShader
cubeNode.Color = mgl.Vec4{1.0, 0.0, 0.0, 1.0}
// create the collision box for the the cube
var cubeMass m.Real = 8.0
var cubeInertia m.Matrix3
cubeCollider := cubez.NewCollisionCube(nil, m.Vector3{1.0, 1.0, 1.0})
cubeCollider.Body.Position = m.Vector3{0.0, 5.0, 0.0}
cubeCollider.Body.SetMass(cubeMass)
cubeInertia.SetBlockInertiaTensor(&cubeCollider.HalfSize, cubeMass)
cubeCollider.Body.SetInertiaTensor(&cubeInertia)
cubeCollider.Body.CalculateDerivedData()
cubeCollider.CalculateDerivedData()
// make the entity out of the renerable and collider
cube = NewEntity(cubeNode, cubeCollider)
// make a slice of entities for bullets
bullets = make([]*Entity, 0, 16)
// make the backboard to bound the bullets off of
backboardNode := CreateCube(-0.5, -2.0, -0.25, 0.5, 2.0, 0.25)
backboardNode.Shader = colorShader
backboardNode.Color = mgl.Vec4{0.25, 0.2, 0.2, 1.0}
backboardCollider := cubez.NewCollisionCube(nil, m.Vector3{0.5, 2.0, 0.25})
backboardCollider.Body.Position = m.Vector3{0.0, 2.0, -10.0}
backboardCollider.Body.SetInfiniteMass()
backboardCollider.Body.CalculateDerivedData()
backboardCollider.CalculateDerivedData()
SetGlVector3(&backboardNode.Location, &backboardCollider.Body.Position)
// make the backboard entity
backboard = NewEntity(backboardNode, backboardCollider)
// setup the camera
app.CameraPos = mgl.Vec3{-3.0, 3.0, 15.0}
app.CameraRotation = mgl.QuatLookAtV(
mgl.Vec3{-3.0, 3.0, 15.0},
mgl.Vec3{0.0, 1.0, 0.0},
mgl.Vec3{0.0, 1.0, 0.0})
gl.Enable(gl.DEPTH_TEST)
app.RenderLoop()
}
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
}