func initScene() {
halfW, halfH := float32(Width)*0.5, float32(Height)*0.5
Projection = mgl.Ortho2D(-halfW, halfW, -halfH, halfH).Mul4(
mgl.Translate3D(-halfW, -halfH, 0))
ModelView = mgl.Ident4f().Mul4(mgl.Scale3D(100, 100, 0))
MVP <- Projection.Mul4(ModelView)
gl.Disable(gl.DEPTH_TEST)
gl.DepthMask(false)
program := Program(FragmentShader(fsh), VertexShader(vsh))
gl.UseProgram(uint(program))
uMVP = gl.GetUniformLocation(program, "uMVP")
attrPos = gl.GetAttribLocation(program, "pos")
attrColor = gl.GetAttribLocation(program, "color")
gl.EnableVertexAttribArray(uint(attrPos))
gl.EnableVertexAttribArray(uint(attrColor))
gl.ClearColor(0.0, 0.0, 0.0, 1.0)
gl.VertexAttribPointer(uint(attrPos), 2, gl.FLOAT, false, 0, uintptr(gl.Void(&POSITION[0])))
gl.VertexAttribPointer(uint(attrColor), 4, gl.FLOAT, false, 0, uintptr(gl.Void(&COLOR[0])))
}
func reshape(w *glfw.Window, width, height int) {
gl.Viewport(0, 0, width, height)
halfW, halfH := float32(width)*0.5, float32(height)*0.5
Projection = mgl.Ortho2D(-halfW, halfW, -halfH, halfH).Mul4(
mgl.Translate3D(-halfW, -halfH, 0))
go func(m mgl.Mat4f) { MVP <- m }(Projection.Mul4(ModelView))
}
func keyEvent(w *glfw.Window, key glfw.Key, scancode int, action glfw.Action, mods glfw.ModifierKey) {
switch key {
case glfw.KeyEscape:
w.SetShouldClose(true)
case glfw.KeyLeft:
if mods == glfw.ModShift {
ModelView = ModelView.Mul4(mgl.HomogRotate3DY(5))
} else {
ModelView = ModelView.Mul4(mgl.Translate3D(-0.1, 0, 0))
}
case glfw.KeyRight:
if mods == glfw.ModShift {
ModelView = ModelView.Mul4(mgl.HomogRotate3DY(-5))
} else {
ModelView = ModelView.Mul4(mgl.Translate3D(0.1, 0, 0))
}
case glfw.KeyUp:
if mods == glfw.ModShift {
ModelView = ModelView.Mul4(mgl.HomogRotate3DX(5))
} else {
ModelView = ModelView.Mul4(mgl.Translate3D(0, 0.1, 0))
}
case glfw.KeyDown:
if mods == glfw.ModShift {
ModelView = ModelView.Mul4(mgl.HomogRotate3DX(-5))
} else {
ModelView = ModelView.Mul4(mgl.Translate3D(0, -0.1, 0))
}
case glfw.KeyMinus:
ModelView = ModelView.Mul4(mgl.Translate3D(0, 0, -0.1))
case glfw.KeyEqual:
ModelView = ModelView.Mul4(mgl.Translate3D(0, 0, 0.1))
}
go func(m mgl.Mat4f) { MVP <- m }(Projection.Mul4(ModelView))
}
func (w *World) SetCamera(x, y, z float32) {
// set the view matrix
// w.view = mathgl.LookAt(0.0, 0.0, 10.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0)
w.view = mathgl.Translate3D(-x, -y, -z)
}