// Render renders the model
func (m *Model) Render() {
gl.UseProgram(m.currentProgram)
gl.UniformMatrix4fv(m.modelUniform, 1, false, &m.model[0])
gl.BindVertexArray(m.vao)
gl.ActiveTexture(gl.TEXTURE0)
texture, isLoaded := m.textures.GetTexture(m.data.TextureFile)
if isLoaded {
gl.BindTexture(gl.TEXTURE_2D, texture)
} else {
if m.data.TextureFile != "" {
go fmt.Printf("Unable to load texture %s", m.data.TextureFile)
}
}
if m.data.Indexed {
gl.DrawElements(gl.TRIANGLE_FAN, int32(len(m.data.Indices)), gl.UNSIGNED_INT, gl.PtrOffset(0))
} else {
gl.DrawArrays(gl.TRIANGLES, 0, int32(len(m.data.Verts))/m.data.VertSize)
}
gl.BindVertexArray(0)
}
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 (me *GlObj) Draw(c *Core) {
gl.UseProgram(c.Progs[me.Prog])
gl.BindVertexArray(c.Vao[me.Vao])
// shoud check if texture has been set for current object
gl.ActiveTexture(gl.TEXTURE0)
gl.BindTexture(gl.TEXTURE_2D, c.Textures[me.Texture])
gl.DrawArrays(gl.TRIANGLES, 0, me.nbTriangles)
}
func (me *GlObj) Draw(c *Core) {
gl.UseProgram(c.Progs[me.Prog])
gl.BindVertexArray(c.Vao[me.Vao])
// shoud check if texture has been set for current object
// no need to be set again, if only one texture has been loaded
// already binded/actived in new texture
gl.ActiveTexture(gl.TEXTURE0)
gl.BindTexture(gl.TEXTURE_2D, c.Textures[me.Texture])
gl.DrawArrays(gl.TRIANGLES, 0, me.nbTriangles)
}
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()
}
}
func drawLoop(win *glfw.Window, vao uint32, shader uint32) {
for !win.ShouldClose() {
gl.Clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT)
gl.BindVertexArray(vao)
gl.UseProgram(shader)
gl.DrawArrays(gl.TRIANGLES, 0, 3)
glfw.PollEvents()
win.SwapBuffers()
}
}
func (vao VertexArray) DrawElements(start, count int32) error {
if start < 0 || start+count > vao.Length {
// todo: error
return fmt.Errorf("Draw index out of range")
}
err := vao.Bind()
if err != nil {
return err
}
gl.DrawArrays(vao.Type, 0, vao.Length)
}
// Draw will draw the billvboard in the x,y and z
func (billboard *Billboard) Draw(x float32, y float32, z float32) {
model := mgl32.Translate3D(x, y, z)
if shader := shader.GetActive(); shader != nil {
gl.UniformMatrix4fv(shader.Model, 1, false, &model[0])
}
gl.BindVertexArray(billboard.vao)
gl.ActiveTexture(gl.TEXTURE0)
gl.BindTexture(gl.TEXTURE_2D, billboard.image)
gl.DrawArrays(gl.TRIANGLES, 0, 1*2*3)
}
// DrawFrame will draw the sprite in the x,y and z with the specified frame from a spritesheet
func (sprite *Sprite) DrawFrame(x float32, y float32, z float32, scale float32, frame int) {
model := mgl32.Translate3D(x, y, z)
model = model.Mul4(mgl32.Scale3D(scale, scale, 1))
// remember this is in radians!
// model = model.Mul4(mgl32.HomogRotate3D(mgl32.DegToRad(90), mgl32.Vec3{0, 0, 1}))
if shader := shader.GetActive(); shader != nil {
gl.UniformMatrix4fv(shader.Model, 1, false, &model[0])
}
gl.BindVertexArray(sprite.vao)
sprite.image.Bind()
gl.DrawArrays(gl.TRIANGLES, int32(frame*6), 6)
}
func (glRenderer *OpenglRenderer) renderPostEffect(pe postEffect) {
gl.UseProgram(pe.program)
gl.ActiveTexture(gl.TEXTURE0)
gl.BindTexture(gl.TEXTURE_2D, pe.textureId)
gl.Disable(gl.CULL_FACE)
gl.BindBuffer(gl.ARRAY_BUFFER, glRenderer.postEffectVbo)
setupUniforms(pe.shader)
vertAttrib := uint32(gl.GetAttribLocation(pe.program, gl.Str("vert\x00")))
gl.EnableVertexAttribArray(vertAttrib)
gl.VertexAttribPointer(vertAttrib, 2, gl.FLOAT, false, 4*4, gl.PtrOffset(0))
texCoordAttrib := uint32(gl.GetAttribLocation(pe.program, gl.Str("vertTexCoord\x00")))
gl.EnableVertexAttribArray(texCoordAttrib)
gl.VertexAttribPointer(texCoordAttrib, 2, gl.FLOAT, false, 4*4, gl.PtrOffset(2*4))
gl.DrawArrays(gl.TRIANGLE_STRIP, 0, 4)
gl.DisableVertexAttribArray(texCoordAttrib)
}
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
}
func (renderer *Renderer) Loop() {
defer glog.Flush()
if err := glfw.Init(); err != nil {
glog.Fatalln("GLFW failed to initialize:", err)
glog.Info("GLFW failed to init")
}
glfw.WindowHint(glfw.ContextVersionMajor, 3)
glfw.WindowHint(glfw.ContextVersionMinor, 2)
glfw.WindowHint(glfw.OpenGLForwardCompatible, glfw.True)
glfw.WindowHint(glfw.Resizable, glfw.False)
window, windowError := glfw.CreateWindow(800, 600, "OpenGL", nil, nil)
if windowError != nil {
glog.Info("oops")
panic(windowError)
}
glog.Info("Buffer")
defer func() {
window.Destroy()
glfw.Terminate()
glog.Info("ending")
renderer.ended = true
//system_end <- true
}()
window.MakeContextCurrent()
if err := gl.Init(); err != nil {
panic(err)
}
renderer.keyCallback = func(window *glfw.Window, key glfw.Key, scancode int, action glfw.Action, mods glfw.ModifierKey) {
glog.Infof("key: %v, scancode: %v, action: %v, mods: %v", key, scancode, action, mods)
}
window.SetKeyCallback(renderer.keyCallback)
//<-system_start
renderer.started = true
//system_started <- true
gl.ClearDepth(1.0)
var vboID uint32
gl.GenBuffers(1, &vboID)
var vertexData = []float32{
1, 1, 0, 1, 0, 0, 0, 0, 1, 0, 1, 1,
}
gl.BindBuffer(gl.ARRAY_BUFFER, vboID)
gl.BufferData(gl.ARRAY_BUFFER, len(vertexData)*4, gl.Ptr(vertexData), gl.STATIC_DRAW)
gl.BindBuffer(gl.ARRAY_BUFFER, 0)
//get shaders
vertexShader, fragmentShader := getShaders()
program, err := newProgram(vertexShader, fragmentShader)
program.UseProgram()
if err != nil {
panic(err)
}
//bind attributes
// L:
for !window.ShouldClose() {
//renderer.drawGame(program)
gl.EnableVertexAttribArray(0)
gl.BindBuffer(gl.ARRAY_BUFFER, vboID)
gl.VertexAttribPointer(
0,
3,
gl.FLOAT,
false,
0,
gl.PtrOffset(0))
gl.DrawArrays(gl.TRIANGLES, 0, 3)
gl.DisableVertexAttribArray(0)
window.SwapBuffers()
glfw.PollEvents()
}
if vboID != 0 {
gl.DeleteBuffers(1, &vboID)
}
}
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 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
}
func (self *Application) display() {
gl.Clear(gl.COLOR_BUFFER_BIT)
gl.BindVertexArray(self.Triangles)
gl.DrawArrays(gl.TRIANGLES, 0, 6)
}
