func (batch VaoBatch) Enter() {
batch.vao.Bind()
if err := glw.CheckGlError(); err != nil {
err.Description = "VaoBatch.vao.Bind()"
panic(err)
}
}
func (batch UniformBatch) Enter() {
batch.modelMatrixUniform.UniformMatrix4f(false, &batch.modelMatrix)
batch.context.Program.Validate()
if err := glw.CheckGlError(); err != nil {
err.Description = "Program.Validate failed."
panic(err)
}
status := batch.context.Program.Get(gl.VALIDATE_STATUS)
if err := glw.CheckGlError(); err != nil {
err.Description = "Program.Get(VALIDATE_STATUS) failed."
panic(err)
}
if status == gl.FALSE {
infolog := batch.context.Program.GetInfoLog()
gl.GetError() // Clear error flag if infolog derped.
panic(fmt.Errorf("Program validation failed. Log: %v", infolog))
}
}
func (batch ProgramBatch) Enter() {
program, err := batch.context.Programs.Serve(batch.shaderRefs)
if err != nil {
panic(err)
}
program.Use()
if err := glw.CheckGlError(); err != nil {
err.Description = fmt.Sprintf("program.Use() for ProgramBatch %v", program)
}
batch.context.Program = program
}
func (batch ClearBatch) Enter() {
if batch.clearMask&gl.COLOR_BUFFER_BIT != 0 {
gl.ClearColor(
batch.clearColor[0],
batch.clearColor[1],
batch.clearColor[2],
batch.clearColor[3],
)
}
if batch.clearMask&gl.DEPTH_BUFFER_BIT != 0 {
gl.ClearDepth(batch.clearDepth)
}
gl.Clear(batch.clearMask)
if err := glw.CheckGlError(); err != nil {
err.Description = "gl.Clear"
panic(err)
}
}
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)
}