func programLoop(window *glfw.Window) {
// the linked shader program determines how the data will be rendered
shaders := compileShaders()
shaderProgram := linkShaders(shaders)
// VAO contains all the information about the data to be rendered
VAO := createTriangleVAO()
for !window.ShouldClose() {
// poll events and call their registered callbacks
glfw.PollEvents()
// perform rendering
gl.ClearColor(0.2, 0.5, 0.5, 1.0)
gl.Clear(gl.COLOR_BUFFER_BIT)
// draw loop
gl.UseProgram(shaderProgram) // ensure the right shader program is being used
gl.BindVertexArray(VAO) // bind data
gl.DrawArrays(gl.TRIANGLES, 0, 3) // perform draw call
gl.BindVertexArray(0) // unbind data (so we don't mistakenly use/modify it)
// end of draw loop
// swap in the rendered buffer
window.SwapBuffers()
}
}
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 draw(w *glfw.Window) {
//Get the horizontal split size of the window
sizex, sizey := w.GetSize()
var eyesize mgl32.Vec2
eyesize[0] = float32(sizex / 2.0)
eyesize[1] = float32(sizey)
gl.Enable(gl.SCISSOR_TEST)
gl.Scissor(0, 0, int32(eyesize[0]), int32(eyesize[1]))
gl.ClearColor(1, 0, 0, 1)
gl.Clear(gl.COLOR_BUFFER_BIT)
gl.Scissor(int32(eyesize[0]), 0, int32(eyesize[0]), int32(eyesize[1]))
gl.ClearColor(0, 0, 1, 1)
gl.Clear(gl.COLOR_BUFFER_BIT)
gl.Disable(gl.SCISSOR_TEST)
}
func (me *Core) CreateWin(width, height int, name string) {
glfw.WindowHint(glfw.ContextVersionMajor, 4)
glfw.WindowHint(glfw.ContextVersionMinor, 5)
glfw.WindowHint(glfw.OpenGLForwardCompatible, glfw.True)
glfw.WindowHint(glfw.OpenGLProfile, glfw.OpenGLCoreProfile)
glfw.WindowHint(glfw.Samples, 4) // AA4
glfw.WindowHint(glfw.Resizable, glfw.False)
win, err := glfw.CreateWindow(width, height, name, nil, nil)
if err != nil {
panic(err)
}
me.Win = win
win.MakeContextCurrent()
gl.ClearColor(1.0, 1.0, 1.0, 1.0)
me.ClearOpt = gl.COLOR_BUFFER_BIT
}
func makeWindow() *glfw.Window {
win, err := glfw.CreateWindow(windowWidth, windowHeight, "Tutorial #1", nil, nil)
if err != nil {
panic(err)
}
if err := gl.Init(); err != nil {
panic(err)
}
win.MakeContextCurrent()
gl.ClearColor(1.0, 1.0, 1.0, 1.0)
return win
}
func (r *Renderer) Draw() {
/* Clear screen */
gl.ClearColor(0.9, 0.9, 0.9, 1.0)
gl.Clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT)
/* Enable blending */
gl.Enable(gl.BLEND)
gl.BlendFunc(gl.SRC_ALPHA, gl.ONE_MINUS_SRC_ALPHA)
/* Depth test */
gl.Enable(gl.DEPTH_TEST)
gl.DepthFunc(gl.LESS)
for _, pass := range r.Passes {
pass.DrawPass(r.Scene)
}
}
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 (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()
}
func main() {
if err := glfw.Init(); err != nil {
log.Fatalln("failed to inifitialize 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, "Hello!", nil, nil)
if err != nil {
panic(err)
}
window.MakeContextCurrent()
// Initialize Glow (go function bindings)
if err := gl.Init(); err != nil {
panic(err)
}
window.SetKeyCallback(keyCallback)
// program loop
for !window.ShouldClose() {
// poll events and call their registered callbacks
glfw.PollEvents()
// perform rendering
gl.ClearColor(0.2, 0.5, 0.5, 1.0)
gl.Clear(gl.COLOR_BUFFER_BIT)
// swap in the rendered buffer
window.SwapBuffers()
}
}
func programLoop(window *win.Window) error {
// the linked shader program determines how the data will be rendered
vertShader, err := gfx.NewShaderFromFile("shaders/phong.vert", gl.VERTEX_SHADER)
if err != nil {
return err
}
fragShader, err := gfx.NewShaderFromFile("shaders/phong.frag", gl.FRAGMENT_SHADER)
if err != nil {
return err
}
program, err := gfx.NewProgram(vertShader, fragShader)
if err != nil {
return err
}
defer program.Delete()
lightFragShader, err := gfx.NewShaderFromFile("shaders/light.frag", gl.FRAGMENT_SHADER)
if err != nil {
return err
}
// special shader program so that lights themselves are not affected by lighting
lightProgram, err := gfx.NewProgram(vertShader, lightFragShader)
if err != nil {
return err
}
VAO := createVAO(cubeVertices, nil)
lightVAO := createVAO(cubeVertices, nil)
// ensure that triangles that are "behind" others do not draw over top of them
gl.Enable(gl.DEPTH_TEST)
camera := cam.NewFpsCamera(mgl32.Vec3{0, 0, 3}, mgl32.Vec3{0, 1, 0}, -90, 0, window.InputManager())
for !window.ShouldClose() {
// swaps in last buffer, polls for window events, and generally sets up for a new render frame
window.StartFrame()
// update camera position and direction from input evevnts
camera.Update(window.SinceLastFrame())
// background color
gl.ClearColor(0, 0, 0, 1.0)
gl.Clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT) // depth buffer needed for DEPTH_TEST
// cube rotation matrices
rotateX := (mgl32.Rotate3DX(mgl32.DegToRad(-45 * float32(glfw.GetTime()))))
rotateY := (mgl32.Rotate3DY(mgl32.DegToRad(-45 * float32(glfw.GetTime()))))
rotateZ := (mgl32.Rotate3DZ(mgl32.DegToRad(-45 * float32(glfw.GetTime()))))
// creates perspective
fov := float32(60.0)
projectTransform := mgl32.Perspective(mgl32.DegToRad(fov),
float32(window.Width())/float32(window.Height()),
0.1,
100.0)
camTransform := camera.GetTransform()
lightPos := mgl32.Vec3{0.6, 1, 0.1}
lightTransform := mgl32.Translate3D(lightPos.X(), lightPos.Y(), lightPos.Z()).Mul4(
mgl32.Scale3D(0.2, 0.2, 0.2))
program.Use()
gl.UniformMatrix4fv(program.GetUniformLocation("view"), 1, false, &camTransform[0])
gl.UniformMatrix4fv(program.GetUniformLocation("project"), 1, false,
&projectTransform[0])
gl.BindVertexArray(VAO)
// draw each cube after all coordinate system transforms are bound
// obj is colored, light is white
gl.Uniform3f(program.GetUniformLocation("material.ambient"), 1.0, 0.5, 0.31)
gl.Uniform3f(program.GetUniformLocation("material.diffuse"), 1.0, 0.5, 0.31)
gl.Uniform3f(program.GetUniformLocation("material.specular"), 0.5, 0.5, 0.5)
gl.Uniform1f(program.GetUniformLocation("material.shininess"), 32.0)
lightColor := mgl32.Vec3{
float32(math.Sin(glfw.GetTime() * 1)),
float32(math.Sin(glfw.GetTime() * 0.35)),
float32(math.Sin(glfw.GetTime() * 0.65)),
}
diffuseColor := mgl32.Vec3{
0.5 * lightColor[0],
0.5 * lightColor[1],
0.5 * lightColor[2],
}
ambientColor := mgl32.Vec3{
0.2 * lightColor[0],
0.2 * lightColor[1],
0.2 * lightColor[2],
}
gl.Uniform3f(program.GetUniformLocation("light.ambient"),
ambientColor[0], ambientColor[1], ambientColor[2])
gl.Uniform3f(program.GetUniformLocation("light.diffuse"),
diffuseColor[0], diffuseColor[1], diffuseColor[2])
gl.Uniform3f(program.GetUniformLocation("light.specular"), 1.0, 1.0, 1.0)
gl.Uniform3f(program.GetUniformLocation("light.position"), lightPos.X(), lightPos.Y(), lightPos.Z())
for _, pos := range cubePositions {
// turn the cubes into rectangular prisms for more fun
worldTranslate := mgl32.Translate3D(pos[0], pos[1], pos[2])
worldTransform := worldTranslate.Mul4(
rotateX.Mul3(rotateY).Mul3(rotateZ).Mat4(),
)
gl.UniformMatrix4fv(program.GetUniformLocation("model"), 1, false,
&worldTransform[0])
gl.DrawArrays(gl.TRIANGLES, 0, 36)
}
gl.BindVertexArray(0)
// Draw the light obj after the other boxes using its separate shader program
// this means that we must re-bind any uniforms
lightProgram.Use()
gl.BindVertexArray(lightVAO)
gl.UniformMatrix4fv(lightProgram.GetUniformLocation("model"), 1, false, &lightTransform[0])
gl.UniformMatrix4fv(lightProgram.GetUniformLocation("view"), 1, false, &camTransform[0])
gl.UniformMatrix4fv(lightProgram.GetUniformLocation("project"), 1, false, &projectTransform[0])
gl.DrawArrays(gl.TRIANGLES, 0, 36)
gl.BindVertexArray(0)
// end of draw loop
}
return nil
}
func programLoop(window *glfw.Window) error {
// the linked shader program determines how the data will be rendered
vertShader, err := gfx.NewShaderFromFile("shaders/basic.vert", gl.VERTEX_SHADER)
if err != nil {
return err
}
fragShader, err := gfx.NewShaderFromFile("shaders/basic.frag", gl.FRAGMENT_SHADER)
if err != nil {
return err
}
program, err := gfx.NewProgram(vertShader, fragShader)
if err != nil {
return err
}
defer program.Delete()
vertices := []float32{
// position // texture position
-0.5, -0.5, -0.5, 0.0, 0.0,
0.5, -0.5, -0.5, 1.0, 0.0,
0.5, 0.5, -0.5, 1.0, 1.0,
0.5, 0.5, -0.5, 1.0, 1.0,
-0.5, 0.5, -0.5, 0.0, 1.0,
-0.5, -0.5, -0.5, 0.0, 0.0,
-0.5, -0.5, 0.5, 0.0, 0.0,
0.5, -0.5, 0.5, 1.0, 0.0,
0.5, 0.5, 0.5, 1.0, 1.0,
0.5, 0.5, 0.5, 1.0, 1.0,
-0.5, 0.5, 0.5, 0.0, 1.0,
-0.5, -0.5, 0.5, 0.0, 0.0,
-0.5, 0.5, 0.5, 1.0, 0.0,
-0.5, 0.5, -0.5, 1.0, 1.0,
-0.5, -0.5, -0.5, 0.0, 1.0,
-0.5, -0.5, -0.5, 0.0, 1.0,
-0.5, -0.5, 0.5, 0.0, 0.0,
-0.5, 0.5, 0.5, 1.0, 0.0,
0.5, 0.5, 0.5, 1.0, 0.0,
0.5, 0.5, -0.5, 1.0, 1.0,
0.5, -0.5, -0.5, 0.0, 1.0,
0.5, -0.5, -0.5, 0.0, 1.0,
0.5, -0.5, 0.5, 0.0, 0.0,
0.5, 0.5, 0.5, 1.0, 0.0,
-0.5, -0.5, -0.5, 0.0, 1.0,
0.5, -0.5, -0.5, 1.0, 1.0,
0.5, -0.5, 0.5, 1.0, 0.0,
0.5, -0.5, 0.5, 1.0, 0.0,
-0.5, -0.5, 0.5, 0.0, 0.0,
-0.5, -0.5, -0.5, 0.0, 1.0,
-0.5, 0.5, -0.5, 0.0, 1.0,
0.5, 0.5, -0.5, 1.0, 1.0,
0.5, 0.5, 0.5, 1.0, 0.0,
0.5, 0.5, 0.5, 1.0, 0.0,
-0.5, 0.5, 0.5, 0.0, 0.0,
-0.5, 0.5, -0.5, 0.0, 1.0,
}
indices := []uint32{}
VAO := createVAO(vertices, indices)
texture0, err := gfx.NewTextureFromFile("../images/RTS_Crate.png",
gl.CLAMP_TO_EDGE, gl.CLAMP_TO_EDGE)
if err != nil {
panic(err.Error())
}
texture1, err := gfx.NewTextureFromFile("../images/trollface-transparent.png",
gl.CLAMP_TO_EDGE, gl.CLAMP_TO_EDGE)
if err != nil {
panic(err.Error())
}
cubePositions := [][]float32{
[]float32{0.0, 0.0, -3.0},
[]float32{2.0, 5.0, -15.0},
[]float32{-1.5, -2.2, -2.5},
[]float32{-3.8, -2.0, -12.3},
[]float32{2.4, -0.4, -3.5},
[]float32{-1.7, 3.0, -7.5},
[]float32{1.3, -2.0, -2.5},
[]float32{1.5, 2.0, -2.5},
[]float32{1.5, 0.2, -1.5},
[]float32{-1.3, 1.0, -1.5},
}
gl.Enable(gl.DEPTH_TEST)
for !window.ShouldClose() {
// poll events and call their registered callbacks
glfw.PollEvents()
// background color
gl.ClearColor(0.2, 0.5, 0.5, 1.0)
gl.Clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT)
// draw vertices
program.Use()
// set texture0 to uniform0 in the fragment shader
texture0.Bind(gl.TEXTURE0)
texture0.SetUniform(program.GetUniformLocation("ourTexture0"))
// set texture1 to uniform1 in the fragment shader
texture1.Bind(gl.TEXTURE1)
texture1.SetUniform(program.GetUniformLocation("ourTexture1"))
// update shader transform matrices
// Create transformation matrices
rotateX := (mgl32.Rotate3DX(mgl32.DegToRad(-60 * float32(glfw.GetTime()))))
rotateY := (mgl32.Rotate3DY(mgl32.DegToRad(-60 * float32(glfw.GetTime()))))
rotateZ := (mgl32.Rotate3DZ(mgl32.DegToRad(-60 * float32(glfw.GetTime()))))
viewTransform := mgl32.Translate3D(0, 0, -3)
projectTransform := mgl32.Perspective(mgl32.DegToRad(60), windowWidth/windowHeight, 0.1, 100.0)
gl.UniformMatrix4fv(program.GetUniformLocation("view"), 1, false,
&viewTransform[0])
gl.UniformMatrix4fv(program.GetUniformLocation("project"), 1, false,
&projectTransform[0])
gl.UniformMatrix4fv(program.GetUniformLocation("worldRotateX"), 1, false,
&rotateX[0])
gl.UniformMatrix4fv(program.GetUniformLocation("worldRotateY"), 1, false,
&rotateY[0])
gl.UniformMatrix4fv(program.GetUniformLocation("worldRotateZ"), 1, false,
&rotateZ[0])
gl.BindVertexArray(VAO)
for _, pos := range cubePositions {
worldTranslate := mgl32.Translate3D(pos[0], pos[1], pos[2])
worldTransform := (worldTranslate.Mul4(rotateX.Mul3(rotateY).Mul3(rotateZ).Mat4()))
gl.UniformMatrix4fv(program.GetUniformLocation("world"), 1, false,
&worldTransform[0])
gl.DrawArrays(gl.TRIANGLES, 0, 36)
}
// gl.DrawElements(gl.TRIANGLES, 36, gl.UNSIGNED_INT, unsafe.Pointer(nil))
gl.BindVertexArray(0)
texture0.UnBind()
texture1.UnBind()
// end of draw loop
// swap in the rendered buffer
window.SwapBuffers()
}
return nil
}
// SetClearColor sets the color when the screen is cleared for redrawing
func (window *Screen) SetClearColor(r float32, g float32, b float32, a float32) {
gl.ClearColor(r, g, b, a)
}
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() {
var parser = flags.NewParser(&gOpts, flags.Default)
var err error
var args []string
if args, err = parser.Parse(); err != nil {
os.Exit(1)
}
if len(args) < 1 || len(args) > 2 {
panic(fmt.Errorf("Too many or not enough arguments"))
}
gDiffFlag = len(args) == 2
// make sure that we display any errors that are encountered
//glfw.SetErrorCallback(errorCallback)
// the GLFW library has to be initialized before any of the methods
// can be invoked
if err = glfw.Init(); err != nil {
panic(err)
}
// to be tidy, make sure glfw.Terminate() is called at the end of
// the program to clean things up by using `defer`
defer glfw.Terminate()
// hints are the way you configure the features requested for the
// window and are required to be set before calling glfw.CreateWindow().
// desired number of samples to use for mulitsampling
//glfw.WindowHint(glfw.Samples, 4)
// request a OpenGL 4.1 core context
if runtime.GOOS == "darwin" {
glfw.WindowHint(glfw.ContextVersionMajor, 3)
glfw.WindowHint(glfw.ContextVersionMinor, 3)
} else {
glfw.WindowHint(glfw.ContextVersionMajor, 4)
glfw.WindowHint(glfw.ContextVersionMinor, 1)
}
glfw.WindowHint(glfw.OpenGLForwardCompatible, glfw.True)
glfw.WindowHint(glfw.OpenGLProfile, glfw.OpenGLCoreProfile)
// do the actual window creation
var window *glfw.Window
window, err = glfw.CreateWindow(1024, 768, "goicmpgl", nil, nil)
if err != nil {
// we legitimately cannot recover from a failure to create
// the window in this sample, so just bail out
panic(err)
}
// set the callback function to get all of the key input from the user
window.SetKeyCallback(keyCallback)
window.SetMouseButtonCallback(mouseDownCallback)
window.SetScrollCallback(mouseWheelCallback)
window.SetCursorPosCallback(mouseMoveCallback)
// GLFW3 can work with more than one window, so make sure we set our
// new window as the current context to operate on
window.MakeContextCurrent()
// disable v-sync for max FPS if the driver allows it
//glfw.SwapInterval(0)
// make sure that GLEW initializes all of the GL functions
if err = gl.Init(); err != nil {
panic(err)
}
var attribs []string = []string{
"position",
"uvs",
}
// compile our shaders
var progTex0 *Program
if progTex0, err = LoadShaderProgram(vertShader, fragShaderTex0, attribs); err != nil {
panic(err)
}
defer progTex0.DeleteProgram()
var progGrid *Program
if progGrid, err = LoadShaderProgram(vertShader, S_FragmentShader_Grid, attribs); err != nil {
panic(err)
}
defer progGrid.DeleteProgram()
var diffProg2 *Program
if diffProg2, err = LoadShaderProgram(vertShader, sProgram2Src, attribs); err != nil {
panic(err)
}
defer diffProg2.DeleteProgram()
var diffProg3 *Program
if diffProg3, err = LoadShaderProgram(vertShader, sProgram3Src, attribs); err != nil {
panic(err)
}
defer diffProg3.DeleteProgram()
var diffProg4 *Program
if diffProg4, err = LoadShaderProgram(vertShader, sProgram4Src, attribs); err != nil {
panic(err)
}
defer diffProg4.DeleteProgram()
var diffProg5 *Program
if diffProg5, err = LoadShaderProgram(vertShader, sProgram5Src, attribs); err != nil {
panic(err)
}
defer diffProg5.DeleteProgram()
var image1_path string = args[0]
if strings.HasPrefix(image1_path, "http") {
if err, image1_path = downloadImage(image1_path); err != nil {
panic(err)
}
}
var texture *Texture
if err, texture, gImage1 = NewTexture(image1_path, false); err != nil {
panic(err)
}
defer texture.DeleteTexture()
var texture2 *Texture
if gDiffFlag {
var image2_path string = args[1]
if strings.HasPrefix(image2_path, "http") {
if err, image2_path = downloadImage(image2_path); err != nil {
panic(err)
}
}
if err, texture2, gImage2 = NewTexture(image2_path, false); err != nil {
panic(err)
}
defer texture2.DeleteTexture()
if texture.Size.X != texture2.Size.X || texture.Size.Y != texture2.Size.Y {
fmt.Println("WARNING: image dimensions differ!")
} else {
fmt.Printf("image dimensions: %dx%d\n", texture.Size.X, texture.Size.Y)
}
} else {
fmt.Printf("image dimensions: %dx%d\n", texture.Size.X, texture.Size.Y)
}
var font *Font
if err, font = NewFont("Font.png", 16); err != nil {
panic(err)
}
defer font.DeleteFont()
var help1 *String = font.NewString("1: show only A")
defer help1.DeleteString()
var help2 *String = font.NewString("2: show only B")
defer help2.DeleteString()
var help3 *String = font.NewString("3: show diff A&B")
defer help3.DeleteString()
var helph *String = font.NewString("h: toggle this help")
defer helph.DeleteString()
var helparrows *String = font.NewString("<up>,<down>: go from A to B")
defer helparrows.DeleteString()
var helpzoom *String = font.NewString("[]: zoom in/out (also mouse wheel)")
defer helpzoom.DeleteString()
var helpclear *String = font.NewString("Z: reset zoom/view")
defer helpclear.DeleteString()
var helpescape *String = font.NewString("ESC: quit")
defer helpescape.DeleteString()
var vbo *VBO
if vbo, err = NewVBOQuad(0, 0, float32(texture.Size.X), float32(texture.Size.Y)); err != nil {
panic(err)
}
defer vbo.DeleteVBO()
var cnt float32 = 0
// while there's no request to close the window
for !window.ShouldClose() {
cnt += 1
// get the texture of the window because it may have changed since creation
width, height := window.GetFramebufferSize()
wwidth, _ := window.GetSize()
gRetinaScale = float32(width) / float32(wwidth)
//fmt.Printf("x=%d y=%d wx=%d wy=%d\n", width, height, wwidth, wheight)
if cnt >= float32(width) {
cnt = 0
}
var matrix Matrix2x3 = IdentityMatrix2x3()
matrix = matrix.Translate(-1.0, 1.0)
matrix = matrix.Scale(2.0/float32(width), -2.0/float32(height))
// clear it all out
gl.Viewport(0, 0, int32(width), int32(height))
gl.ClearColor(0.0, 0.0, 0.0, 1.0)
gl.Clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT)
gl.Enable(gl.BLEND)
gl.BlendFunc(gl.ONE, gl.ONE_MINUS_SRC_ALPHA)
gl.BlendEquation(gl.FUNC_ADD)
var matrix3 Matrix2x3 = matrix.Scale(gZoom, gZoom)
matrix3 = matrix3.Translate(gOffX, gOffY)
// draw the grid
if true {
vbo.Bind()
progGrid.UseProgram()
color1 := [4]float32{.4, .4, .4, 1}
color2 := [4]float32{.9, .9, .9, 1}
grid := [3]float32{float32(texture.Size.X), float32(texture.Size.Y), 8 / gZoom}
//fmt.Printf("%.2f %.2f %.2f %.2f\n", grid[0], grid[1], grid[2], grid[3])
progGrid.ProgramUniformMatrix4fv("ModelviewMatrix", matrix3.Array())
progGrid.ProgramUniform4fv("color1", color1)
progGrid.ProgramUniform4fv("color2", color2)
progGrid.ProgramUniform3fv("grid", grid)
if err = progGrid.ValidateProgram(); err != nil {
panic(err)
}
vbo.Draw()
vbo.Unbind()
progGrid.UnuseProgram()
}
// draw the texture
if !gDiffFlag {
vbo.Bind()
progTex0.UseProgram()
texture.BindTexture(0)
progTex0.ProgramUniformMatrix4fv("ModelviewMatrix", matrix3.Array())
progTex0.ProgramUniform1i("tex1", 0)
progTex0.ProgramUniform1f("blend", gBlend)
if err = progTex0.ValidateProgram(); err != nil {
panic(err)
}
vbo.Draw()
vbo.Unbind()
progTex0.UnuseProgram()
texture.UnbindTexture(0)
} else {
var diffBlend float32 = gBlend
var diffProg *Program
if diffBlend < 0.25 {
diffBlend *= 4
diffProg = diffProg2
} else if diffBlend < 0.5 { // 0.25 -> 0.5
diffBlend = 4*diffBlend - 1
diffProg = diffProg4
} else if diffBlend < 0.75 { // 0.5 -> 0.75
diffBlend = 4*diffBlend - 2
diffProg = diffProg5
} else { // 0.75 -> 1.0=
diffBlend = 4*diffBlend - 3
diffProg = diffProg3
}
vbo.Bind()
diffProg.UseProgram()
texture.BindTexture(0)
texture2.BindTexture(1)
diffProg.ProgramUniformMatrix4fv("ModelviewMatrix", matrix3.Array())
diffProg.ProgramUniform1i("decalA", 0)
diffProg.ProgramUniform1i("decalB", 1)
diffProg.ProgramUniform1f("diffBlend", diffBlend)
if err = diffProg.ValidateProgram(); err != nil {
panic(err)
}
vbo.Draw()
vbo.Unbind()
diffProg.UnuseProgram()
texture.UnbindTexture(0)
texture2.UnbindTexture(1)
}
// font
if gHelp {
color := [...]float32{0, 0, 1, 1}
bg := [...]float32{0.5, 0.5, 0.5, 0.5}
var line float32 = 0
if err = helph.Draw(font, color, bg, matrix, 0.5, 20, 100+line*128); err != nil {
panic(err)
}
line += 1
help1.Draw(font, color, bg, matrix, 0.5, 20, 100+line*128)
line += 1
help2.Draw(font, color, bg, matrix, 0.5, 20, 100+line*128)
line += 1
help3.Draw(font, color, bg, matrix, 0.5, 20, 100+line*128)
line += 1
helparrows.Draw(font, color, bg, matrix, 0.5, 20, 100+line*128)
line += 1
helpzoom.Draw(font, color, bg, matrix, 0.5, 20, 100+line*128)
line += 1
helpclear.Draw(font, color, bg, matrix, 0.5, 20, 100+line*128)
line += 1
helpescape.Draw(font, color, bg, matrix, 0.5, 20, 100+line*128)
line += 1
}
// swapping OpenGL buffers and polling events has been decoupled
// in GLFW3, so make sure to invoke both here
window.SwapBuffers()
glfw.PollEvents()
}
}
// BackGroundColor - set background color for the scene
func (glRenderer *OpenglRenderer) BackGroundColor(r, g, b, a float32) {
gl.ClearColor(r, g, b, a)
}
/* Clear the frame buffer. Make sure its bound first */
func (f *FrameBuffer) Clear() {
gl.ClearColor(f.ClearColor.R, f.ClearColor.G, f.ClearColor.B, f.ClearColor.A)
gl.Clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT);
}
func (p *LightPass) DrawPass(scene *Scene) {
/* use light pass shader */
p.Material.Use()
shader := p.Material.Shader
/* compute camera view projection inverse */
vp := scene.Camera.Projection.Mul4(scene.Camera.View)
vp_inv := vp.Inv()
shader.Matrix4f("cameraInverse", &vp_inv[0])
/* clear */
gl.ClearColor(0.9, 0.9, 0.9, 1.0)
gl.Clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT)
/* set blending mode to additive */
gl.DepthMask(false)
/* draw lights */
lights := scene.FindLights()
last := len(lights) - 1
for i, light := range lights {
if i == 1 {
/* first light pass we want the shader to restore the depth buffer
* then, disable depth masking so that multiple lights can be drawn */
gl.BlendFunc(gl.ONE, gl.ONE)
}
if i == last {
gl.DepthMask(true)
}
/* draw shadow pass for this light into shadow map */
p.Shadows.DrawPass(scene, &light)
/* use light pass shader */
p.Material.Use()
/* compute world to lightspace (light view projection) matrix */
lp := light.Projection
lv := mgl.LookAtV(light.Position, mgl.Vec3{}, mgl.Vec3{0, 1, 0}) // only for directional light
lvp := lp.Mul4(lv)
shader.Matrix4f("light_vp", &lvp[0])
/* set light uniform attributes */
shader.Vec3("light.Position", &light.Position)
shader.Vec3("light.Color", &light.Color)
shader.Int32("light.Type", int32(light.Type))
shader.Float("light.Range", light.Range)
shader.Float("light.attenuation.Constant", light.Attenuation.Constant)
shader.Float("light.attenuation.Linear", light.Attenuation.Linear)
shader.Float("light.attenuation.Quadratic", light.Attenuation.Quadratic)
/* render light */
gl.Viewport(0, 0, int32(scene.Camera.Width), int32(scene.Camera.Height))
p.quad.Draw()
}
/* reset GL state */
gl.BlendFunc(gl.SRC_ALPHA, gl.ONE_MINUS_SRC_ALPHA)
}
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 (context *Context) SetBackgroundColor(color *Colorf) {
gl.ClearColor(color[0], color[1], color[2], color[3])
}
func programLoop(window *glfw.Window) {
// the linked shader program determines how the data will be rendered
vertexShader := compileShader(vertexShaderSource, gl.VERTEX_SHADER)
fragmentShaderBlue := compileShader(fragmentShaderBlueSource, gl.FRAGMENT_SHADER)
shaderProgramBlue := linkShaders([]uint32{vertexShader, fragmentShaderBlue})
fragmentShaderRed := compileShader(fragmentShaderRedSource, gl.FRAGMENT_SHADER)
shaderProgramRed := linkShaders([]uint32{vertexShader, fragmentShaderRed})
// shader objects are not needed after they are linked into a program object
gl.DeleteShader(vertexShader)
gl.DeleteShader(fragmentShaderBlue)
gl.DeleteShader(fragmentShaderRed)
vertices1 := []float32{
0.2, 0.2, 0.0, // top right
0.2, -0.8, 0.0, // bottom right
-0.8, -0.8, 0.0, // bottom left
-0.8, 0.2, 0.0, // top left
}
indices1 := []uint32{
0, 1, 3, // first triangle
1, 2, 3, // second triangle
}
VAO1 := createTriangleVAO(vertices1, indices1)
vertices2 := []float32{
0.2, 0.6, 0.0, // top
0.6, -0.2, 0.0, // bottom right
-0.2, -0.2, 0.0, // bottom left
}
indices2 := []uint32{
0, 1, 2, // only triangle
}
VAO2 := createTriangleVAO(vertices2, indices2)
for !window.ShouldClose() {
// poll events and call their registered callbacks
glfw.PollEvents()
// perform rendering
gl.ClearColor(0.2, 0.5, 0.5, 1.0)
gl.Clear(gl.COLOR_BUFFER_BIT)
// draw loop
// draw rectangle
gl.PolygonMode(gl.FRONT_AND_BACK, gl.LINE)
gl.UseProgram(shaderProgramRed)
gl.BindVertexArray(VAO1)
gl.DrawElements(gl.TRIANGLES, 6, gl.UNSIGNED_INT, unsafe.Pointer(nil))
gl.BindVertexArray(0)
// draw triangle
gl.PolygonMode(gl.FRONT_AND_BACK, gl.FILL)
gl.UseProgram(shaderProgramBlue)
gl.BindVertexArray(VAO2)
gl.DrawElements(gl.TRIANGLES, 3, gl.UNSIGNED_INT, unsafe.Pointer(nil))
gl.BindVertexArray(0)
// end of draw loop
// swap in the rendered buffer
window.SwapBuffers()
}
}
func programLoop(window *glfw.Window) error {
// the linked shader program determines how the data will be rendered
vertShader, err := gfx.NewShaderFromFile("shaders/basic.vert", gl.VERTEX_SHADER)
if err != nil {
return err
}
fragShader, err := gfx.NewShaderFromFile("shaders/basic.frag", gl.FRAGMENT_SHADER)
if err != nil {
return err
}
shaderProgram, err := gfx.NewProgram(vertShader, fragShader)
if err != nil {
return err
}
defer shaderProgram.Delete()
vertices := []float32{
// top
0.0, 0.5, 0.0, // position
1.0, 0.0, 0.0, // Color
// bottom right
0.5, -0.5, 0.0,
0.0, 1.0, 0.0,
// bottom left
-0.5, -0.5, 0.0,
0.0, 0.0, 1.0,
}
indices := []uint32{
0, 1, 2, // only triangle
}
VAO := createTriangleVAO(vertices, indices)
for !window.ShouldClose() {
// poll events and call their registered callbacks
glfw.PollEvents()
// perform rendering
gl.ClearColor(0.2, 0.5, 0.5, 1.0)
gl.Clear(gl.COLOR_BUFFER_BIT)
// draw loop
// draw triangle
shaderProgram.Use()
gl.BindVertexArray(VAO)
gl.DrawElements(gl.TRIANGLES, 3, gl.UNSIGNED_INT, unsafe.Pointer(nil))
gl.BindVertexArray(0)
// end of draw loop
// swap in the rendered buffer
window.SwapBuffers()
}
return nil
}
func programLoop(window *glfw.Window) error {
// the linked shader program determines how the data will be rendered
vertShader, err := gfx.NewShaderFromFile("shaders/basic.vert", gl.VERTEX_SHADER)
if err != nil {
return err
}
fragShader, err := gfx.NewShaderFromFile("shaders/basic.frag", gl.FRAGMENT_SHADER)
if err != nil {
return err
}
shaderProgram, err := gfx.NewProgram(vertShader, fragShader)
if err != nil {
return err
}
defer shaderProgram.Delete()
vertices := []float32{
// top left
-0.75, 0.75, 0.0, // position
1.0, 0.0, 0.0, // Color
1.0, 0.0, // texture coordinates
// top right
0.75, 0.75, 0.0,
0.0, 1.0, 0.0,
0.0, 0.0,
// bottom right
0.75, -0.75, 0.0,
0.0, 0.0, 1.0,
0.0, 1.0,
// bottom left
-0.75, -0.75, 0.0,
1.0, 1.0, 1.0,
1.0, 1.0,
}
indices := []uint32{
// rectangle
0, 1, 2, // top triangle
0, 2, 3, // bottom triangle
}
VAO := createVAO(vertices, indices)
texture0, err := gfx.NewTextureFromFile("../images/RTS_Crate.png",
gl.CLAMP_TO_EDGE, gl.CLAMP_TO_EDGE)
if err != nil {
panic(err.Error())
}
texture1, err := gfx.NewTextureFromFile("../images/trollface.png",
gl.CLAMP_TO_EDGE, gl.CLAMP_TO_EDGE)
if err != nil {
panic(err.Error())
}
for !window.ShouldClose() {
// poll events and call their registered callbacks
glfw.PollEvents()
// background color
gl.ClearColor(0.2, 0.5, 0.5, 1.0)
gl.Clear(gl.COLOR_BUFFER_BIT)
// draw vertices
shaderProgram.Use()
// set texture0 to uniform0 in the fragment shader
texture0.Bind(gl.TEXTURE0)
texture0.SetUniform(shaderProgram.GetUniformLocation("ourTexture0"))
// set texture1 to uniform1 in the fragment shader
texture1.Bind(gl.TEXTURE1)
texture1.SetUniform(shaderProgram.GetUniformLocation("ourTexture1"))
gl.BindVertexArray(VAO)
gl.DrawElements(gl.TRIANGLES, 6, gl.UNSIGNED_INT, unsafe.Pointer(nil))
gl.BindVertexArray(0)
texture0.UnBind()
texture1.UnBind()
// end of draw loop
// swap in the rendered buffer
window.SwapBuffers()
}
return nil
}
func programLoop(window *win.Window) error {
// the linked shader program determines how the data will be rendered
vertShader, err := gfx.NewShaderFromFile("shaders/basic.vert", gl.VERTEX_SHADER)
if err != nil {
return err
}
fragShader, err := gfx.NewShaderFromFile("shaders/basic.frag", gl.FRAGMENT_SHADER)
if err != nil {
return err
}
program, err := gfx.NewProgram(vertShader, fragShader)
if err != nil {
return err
}
defer program.Delete()
VAO := createVAO(cubeVertices, nil)
texture0, err := gfx.NewTextureFromFile("../images/RTS_Crate.png",
gl.CLAMP_TO_EDGE, gl.CLAMP_TO_EDGE)
if err != nil {
panic(err.Error())
}
texture1, err := gfx.NewTextureFromFile("../images/trollface-transparent.png",
gl.CLAMP_TO_EDGE, gl.CLAMP_TO_EDGE)
if err != nil {
panic(err.Error())
}
// ensure that triangles that are "behind" others do not draw over top of them
gl.Enable(gl.DEPTH_TEST)
camera := cam.NewFpsCamera(mgl32.Vec3{0, 0, 3}, mgl32.Vec3{0, 1, 0}, -90, 0, window.InputManager())
for !window.ShouldClose() {
// swaps in last buffer, polls for window events, and generally sets up for a new render frame
window.StartFrame()
// update camera position and direction from input evevnts
camera.Update(window.SinceLastFrame())
// background color
gl.ClearColor(0.2, 0.5, 0.5, 1.0)
gl.Clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT) // depth buffer needed for DEPTH_TEST
program.Use()
// bind textures
texture0.Bind(gl.TEXTURE0)
texture0.SetUniform(program.GetUniformLocation("ourTexture0"))
texture1.Bind(gl.TEXTURE1)
texture1.SetUniform(program.GetUniformLocation("ourTexture1"))
// cube rotation matrices
rotateX := (mgl32.Rotate3DX(mgl32.DegToRad(-60 * float32(glfw.GetTime()))))
rotateY := (mgl32.Rotate3DY(mgl32.DegToRad(-60 * float32(glfw.GetTime()))))
rotateZ := (mgl32.Rotate3DZ(mgl32.DegToRad(-60 * float32(glfw.GetTime()))))
// creates perspective
fov := float32(60.0)
projectTransform := mgl32.Perspective(mgl32.DegToRad(fov),
float32(window.Width())/float32(window.Height()),
0.1,
100.0)
camTransform := camera.GetTransform()
gl.UniformMatrix4fv(program.GetUniformLocation("camera"), 1, false, &camTransform[0])
gl.UniformMatrix4fv(program.GetUniformLocation("project"), 1, false,
&projectTransform[0])
gl.BindVertexArray(VAO)
// draw each cube after all coordinate system transforms are bound
for _, pos := range cubePositions {
worldTranslate := mgl32.Translate3D(pos[0], pos[1], pos[2])
worldTransform := (worldTranslate.Mul4(rotateX.Mul3(rotateY).Mul3(rotateZ).Mat4()))
gl.UniformMatrix4fv(program.GetUniformLocation("world"), 1, false,
&worldTransform[0])
gl.DrawArrays(gl.TRIANGLES, 0, 36)
}
gl.BindVertexArray(0)
texture0.UnBind()
texture1.UnBind()
// end of draw loop
}
return nil
}