func render() {
modelMatrix = trig.MatrixMult(trig.RotateY(math.Pi/360), modelMatrix)
gl.Viewport(0, 0, 768, 768)
gl.ClearColor(0.0, 0.0, 0, 0)
gl.Enable(gl.DEPTH_TEST)
raytraceProgram.Use()
mInput.UniformMatrix4f(false, (*[16]float32)(modelMatrix))
vInput.UniformMatrix4f(false, (*[16]float32)(viewMatrix))
pInput.UniformMatrix4f(false, (*[16]float32)(projMatrix))
glh.With(framebuffer, func() {
framebuffer.UpdateTextures()
gl.DrawBuffer(gl.COLOR_ATTACHMENT0)
gl.Clear(gl.COLOR_BUFFER_BIT)
gl.DepthFunc(gl.GREATER)
gl.CullFace(gl.BACK)
cube.Render(gl.TRIANGLES, raytraceProgram)
gl.DrawBuffer(gl.COLOR_ATTACHMENT1)
gl.Clear(gl.COLOR_BUFFER_BIT)
gl.DepthFunc(gl.LESS)
gl.CullFace(gl.FRONT)
cube.Render(gl.TRIANGLES, raytraceProgram)
})
}
// Initialize the window. Returns an error if glfw or glew throws one.
func InitWindow(width, height int) error {
Width, Height = width, height
err := glfw.Init()
if err != nil {
return err
}
err = glfw.OpenWindow(Width, Height, 0, 0, 0, 32, 32, 32, glfw.Windowed)
if err != nil {
return err
}
WindowOpened = true
glfw.SetWindowTitle("Goliath")
glfw.Enable(glfw.KeyRepeat)
if ret := gl.Init(); ret != 0 {
return fmt.Errorf("failed to initialize GLEW: %d", ret)
}
// Set GL states
gl.ClearColor(0.0, 0.0, 0.0, 1.0)
gl.Enable(gl.CULL_FACE)
gl.CullFace(gl.BACK)
gl.FrontFace(gl.CCW)
err = InitShaders()
if err != nil {
return err
}
InitCamera(Width, Height)
return nil
}
func compose() {
//w, h := window.GetSize()
//gl.Viewport(0, 0, w, h)
gl.ClearColor(0, 0, 0, 1)
gl.Clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT)
gl.CullFace(gl.BACK)
composeProgram.Use()
mInputC.UniformMatrix4f(false, (*[16]float32)(modelMatrix))
vInputC.UniformMatrix4f(false, (*[16]float32)(viewMatrix))
pInputC.UniformMatrix4f(false, (*[16]float32)(projMatrix))
cube.Render(gl.TRIANGLES, composeProgram)
}
func main() {
var programState programState
var err error
glfw.SetErrorCallback(errorCallback)
if !glfw.Init() {
panic("GLFW initialization failed.")
}
defer glfw.Terminate()
glfw.WindowHint(glfw.ContextVersionMajor, 3)
glfw.WindowHint(glfw.ContextVersionMinor, 3)
glfw.WindowHint(glfw.SrgbCapable, glfw.True)
glfw.WindowHint(glfw.Resizable, glfw.False)
programState.Gl.Window, err = glfw.CreateWindow(640, 480, "Daggor", nil, nil)
if err != nil {
panic(err)
}
defer programState.Gl.Window.Destroy()
programState.Gl.glfwKeyEventList = makeGlfwKeyEventList()
programState.Gl.Window.SetKeyCallback(programState.Gl.glfwKeyEventList.Callback)
programState.Gl.Window.MakeContextCurrent()
if ec := gl.Init(); ec != 0 {
panic(fmt.Sprintf("OpenGL initialization failed with code %v.", ec))
}
// For some reason, here, the OpenGL error flag for me contains "Invalid enum".
// This is weird since I have not done anything yet. I imagine that something
// goes wrong in gl.Init. Reading the error flag clears it, so I do it.
// Here's the reason:
// https://github.com/go-gl/glfw3/issues/50
// Maybe I should not even ask for a core profile anyway.
// What are the advantages are asking for a core profile?
if err := glw.CheckGlError(); err != nil {
err.Description = "OpenGL has this error right after init for some reason."
//fmt.Println(err)
}
{
// Assert OpenGL >= 3.3.
major := programState.Gl.Window.GetAttribute(glfw.ContextVersionMajor)
minor := programState.Gl.Window.GetAttribute(glfw.ContextVersionMinor)
fmt.Printf("OpenGL version %v.%v.\n", major, minor)
if (major < 3) || (major == 3 && minor < 3) {
panic("OpenGL version 3.3 required, your video card/driver does not seem to support it.")
}
}
programState.Gl.context = glw.NewGlContext()
programState.Gl.Shapes[floorID] = sculpt.FloorInstNorm(programState.Gl.context.Programs)
programState.Gl.Shapes[ceilingID] = sculpt.CeilingInstNorm(programState.Gl.context.Programs)
programState.Gl.Shapes[wallID] = sculpt.WallInstNorm(programState.Gl.context.Programs)
{
// I do not like the default reference frame of OpenGl.
// By default, we look in the direction -z, and y points up.
// I want z to point up, and I want to look in the direction +x
// by default. That way, I move on an xy plane where z is the
// altitude, instead of having the altitude stuffed between
// the two things I use the most. And my reason for pointing
// toward +x is that I use the convention for trigonometry:
// an angle of 0 points to the right (east) of the trigonometric
// circle. Bonus point: this matches Blender's reference frame.
myFrame := glm.ZUP.Mult(glm.RotZ(90))
eye_to_clip := glm.PerspectiveProj(110, 640./480., .1, 100).Mult(myFrame)
programState.Gl.context.SetEyeToClp(eye_to_clip)
}
gl.Enable(gl.FRAMEBUFFER_SRGB)
gl.Enable(gl.DEPTH_TEST)
gl.Enable(gl.CULL_FACE)
gl.CullFace(gl.BACK)
gl.FrontFace(gl.CCW)
gl.Enable(gl.TEXTURE_CUBE_MAP_SEAMLESS)
// This needs a texture server attached to the context, like for programs.
glw.LoadSkybox()
programState.World = world.MakeWorld()
mainLoop(programState)
}