Following a couple different tutorials, got a rotating cube
commit
21f16bf5c3
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@ -0,0 +1,4 @@
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*~
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carpy-breakout
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output.log
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@ -0,0 +1,7 @@
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all: dependencies build
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dependencies:
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go mod tidy
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build:
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go build
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@ -0,0 +1,113 @@
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package glhelpers
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// https://github.com/go-gl/example
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import (
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"os"
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"image"
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"image/draw"
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_ "image/png"
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"fmt"
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"strings"
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gl "github.com/go-gl/gl/v3.1/gles2"
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)
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func NewProgram(vertexShaderSource string, fragmentShaderSource string) (uint32, error) {
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vertexShader, err := compileShader(vertexShaderSource, gl.VERTEX_SHADER)
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if err != nil {
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return 0, err
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}
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fragmentShader, err := compileShader(fragmentShaderSource, gl.FRAGMENT_SHADER)
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if err != nil {
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return 0, err
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}
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program := gl.CreateProgram()
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gl.AttachShader(program, vertexShader)
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gl.AttachShader(program, fragmentShader)
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gl.LinkProgram(program)
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var status int32
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gl.GetProgramiv(program, gl.LINK_STATUS, &status)
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if status == gl.FALSE {
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var logLength int32
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gl.GetProgramiv(program, gl.INFO_LOG_LENGTH, &logLength)
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log := strings.Repeat("\x00", int(logLength+1))
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gl.GetProgramInfoLog(program, logLength, nil, gl.Str(log))
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return 0, fmt.Errorf("failed to link program: %v", log)
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}
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gl.DeleteShader(vertexShader)
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gl.DeleteShader(fragmentShader)
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return program, nil
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}
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func compileShader(source string, shaderType uint32) (uint32, error) {
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shader := gl.CreateShader(shaderType)
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csources, free := gl.Strs(source)
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gl.ShaderSource(shader, 1, csources, nil)
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free()
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gl.CompileShader(shader)
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var status int32
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gl.GetShaderiv(shader, gl.COMPILE_STATUS, &status)
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if status == gl.FALSE {
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var logLength int32
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gl.GetShaderiv(shader, gl.INFO_LOG_LENGTH, &logLength)
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log := strings.Repeat("\x00", int(logLength + 1))
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gl.GetShaderInfoLog(shader, logLength, nil, gl.Str(log))
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return 0, fmt.Errorf("failed to compile %v: %v", source, log)
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}
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return shader, nil
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}
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func NewTexture(file string) (uint32, error) {
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imgFile, err := os.Open(file)
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if err != nil {
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return 0, fmt.Errorf("texture %q file not found found: %v", file, err)
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}
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img, _, err := image.Decode(imgFile)
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if err != nil {
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return 0, err
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}
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rgba := image.NewRGBA(img.Bounds())
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if rgba.Stride != rgba.Rect.Size().X*4 {
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return 0, fmt.Errorf("unsupported stride")
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}
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draw.Draw(rgba, rgba.Bounds(), img, image.Point{0, 0}, draw.Src)
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var texture uint32
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gl.GenTextures(1, &texture)
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gl.ActiveTexture(gl.TEXTURE0)
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gl.BindTexture(gl.TEXTURE_2D, texture)
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gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR)
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gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.LINEAR)
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gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.CLAMP_TO_EDGE)
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gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.CLAMP_TO_EDGE)
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gl.TexImage2D(
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gl.TEXTURE_2D,
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0,
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gl.RGBA,
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int32(rgba.Rect.Size().X),
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int32(rgba.Rect.Size().Y),
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0,
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gl.RGBA,
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gl.UNSIGNED_BYTE,
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gl.Ptr(rgba.Pix),
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)
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return texture, nil
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}
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module gitea.wisellama.rocks/carpy-breakout
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go 1.17
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require (
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github.com/go-gl/gl v0.0.0-20210813123233-e4099ee2221f
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github.com/go-gl/mathgl v1.0.0
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github.com/veandco/go-sdl2 v0.4.9
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)
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require golang.org/x/image v0.0.0-20190321063152-3fc05d484e9f // indirect
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github.com/go-gl/gl v0.0.0-20210813123233-e4099ee2221f h1:s0O46d8fPwk9kU4k1jj76wBquMVETx7uveQD9MCIQoU=
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github.com/go-gl/gl v0.0.0-20210813123233-e4099ee2221f/go.mod h1:wjpnOv6ONl2SuJSxqCPVaPZibGFdSci9HFocT9qtVYM=
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github.com/go-gl/mathgl v1.0.0 h1:t9DznWJlXxxjeeKLIdovCOVJQk/GzDEL7h/h+Ro2B68=
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github.com/go-gl/mathgl v1.0.0/go.mod h1:yhpkQzEiH9yPyxDUGzkmgScbaBVlhC06qodikEM0ZwQ=
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github.com/veandco/go-sdl2 v0.4.9 h1:Fc0/Xj8JToXO7qia77Vc1M6bP7iufE+vzsLNah70Y6M=
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github.com/veandco/go-sdl2 v0.4.9/go.mod h1:OROqMhHD43nT4/i9crJukyVecjPNYYuCofep6SNiAjY=
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golang.org/x/image v0.0.0-20190321063152-3fc05d484e9f h1:FO4MZ3N56GnxbqxGKqh+YTzUWQ2sDwtFQEZgLOxh9Jc=
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golang.org/x/image v0.0.0-20190321063152-3fc05d484e9f/go.mod h1:kZ7UVZpmo3dzQBMxlp+ypCbDeSB+sBbTgSJuh5dn5js=
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golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
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@ -0,0 +1,289 @@
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package main
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import (
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"flag"
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"fmt"
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"log"
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"os"
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"runtime"
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"runtime/pprof"
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"github.com/veandco/go-sdl2/sdl"
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gl "github.com/go-gl/gl/v3.1/gles2"
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"github.com/go-gl/mathgl/mgl32"
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"gitea.wisellama.rocks/carpy-breakout/glhelpers"
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)
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var cpuprofile = flag.String("cpuprofile", "", "write cpu profile to file")
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const GameTitle = "Carpy Breakout"
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const DefaultWindowWidth int32 = 800
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const DefaultWindowHeight int32 = 600
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const DefaultWindowFlags uint32 = sdl.WINDOW_SHOWN | sdl.WINDOW_RESIZABLE | sdl.WINDOW_OPENGL
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const FullscreenWindowFlags uint32 = DefaultWindowFlags | sdl.WINDOW_FULLSCREEN_DESKTOP
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const LogFile = "output.log"
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func main() {
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flag.Parse()
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if *cpuprofile != "" {
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f, err := os.Create(*cpuprofile)
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if err != nil {
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log.Fatal(err)
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}
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pprof.StartCPUProfile(f)
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defer pprof.StopCPUProfile()
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}
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setupLogging()
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run()
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}
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func run() {
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runtime.LockOSThread() // TODO can rework stuff to not need this.
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log.Println(os.Environ())
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err := sdl.Init(sdl.INIT_EVERYTHING)
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if err != nil {
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panic(err)
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}
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defer sdl.Quit()
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// Disable the Linux compositor flicker.
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// https://github.com/mosra/magnum/issues/184#issuecomment-425952900
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sdl.SetHint(sdl.HINT_VIDEO_X11_NET_WM_BYPASS_COMPOSITOR, "0")
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sdl.DisableScreenSaver()
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//sdl.GLSetAttribute(sdl.GL_MULTISAMPLESAMPLES, 4) // Smooth
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window, err := sdl.CreateWindow(
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GameTitle,
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sdl.WINDOWPOS_UNDEFINED,
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sdl.WINDOWPOS_UNDEFINED,
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DefaultWindowWidth,
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DefaultWindowHeight,
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DefaultWindowFlags)
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if err != nil {
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panic(err)
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}
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defer window.Destroy()
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context, err := window.GLCreateContext()
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if err != nil {
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panic(err)
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}
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defer sdl.GLDeleteContext(context)
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width, height := window.GetSize()
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gl.Init()
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version := gl.GoStr(gl.GetString(gl.VERSION))
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log.Println("OpenGL version", version)
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gl.Viewport(0, 0, width, height)
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gl.ClearColor(0.0, 0.0, 0.0, 1.0)
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program, err := glhelpers.NewProgram(vertexShader, fragmentShader)
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if err != nil {
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panic(err)
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}
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gl.UseProgram(program)
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projection := mgl32.Perspective(mgl32.DegToRad(45.0), float32(width)/float32(height), 0.1, 10.0)
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projectionUniform := gl.GetUniformLocation(program, gl.Str("projection\x00"))
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gl.UniformMatrix4fv(projectionUniform, 1, false, &projection[0])
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camera := mgl32.LookAtV(mgl32.Vec3{3, 3, 3}, mgl32.Vec3{0, 0, 0}, mgl32.Vec3{0, 1, 0})
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cameraUniform := gl.GetUniformLocation(program, gl.Str("camera\x00"))
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gl.UniformMatrix4fv(cameraUniform, 1, false, &camera[0])
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model := mgl32.Ident4()
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modelUniform := gl.GetUniformLocation(program, gl.Str("model\x00"))
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gl.UniformMatrix4fv(modelUniform, 1, false, &model[0])
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textureUniform := gl.GetUniformLocation(program, gl.Str("tex\x00"))
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gl.Uniform1i(textureUniform, 0)
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//gl.BindFragDataLocation(program, 0, gl.Str("outputColor\x00"))
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texture, err := glhelpers.NewTexture("square.png")
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if err != nil {
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log.Fatal(err)
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}
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var vao uint32
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gl.GenVertexArrays(1, &vao)
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gl.BindVertexArray(vao)
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var vbo uint32
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gl.GenBuffers(1, &vbo)
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gl.BindBuffer(gl.ARRAY_BUFFER, vbo)
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gl.BufferData(gl.ARRAY_BUFFER, len(cubeVertices)*4, gl.Ptr(cubeVertices), gl.STATIC_DRAW)
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vertAttrib := uint32(gl.GetAttribLocation(program, gl.Str("vert\x00")))
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gl.EnableVertexAttribArray(vertAttrib)
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gl.VertexAttribPointerWithOffset(vertAttrib, 3, gl.FLOAT, false, 5*4, 0)
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texCoordAttrib := uint32(gl.GetAttribLocation(program, gl.Str("vertTexCoord\x00")))
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gl.EnableVertexAttribArray(texCoordAttrib)
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gl.VertexAttribPointerWithOffset(texCoordAttrib, 2, gl.FLOAT, false, 5*4, 3*4)
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// Configure global settings
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gl.Enable(gl.DEPTH_TEST)
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gl.DepthFunc(gl.LESS)
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gl.ClearColor(1.0, 1.0, 1.0, 1.0)
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running := true
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angle := 0.0
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for running {
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gl.Clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT)
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angle += 0.01
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model = mgl32.HomogRotate3D(float32(angle), mgl32.Vec3{0, 1, 0})
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gl.UseProgram(program)
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gl.UniformMatrix4fv(modelUniform, 1, false, &model[0])
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gl.BindVertexArray(vao)
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gl.ActiveTexture(gl.TEXTURE0)
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gl.BindTexture(gl.TEXTURE_2D, texture)
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gl.DrawArrays(gl.TRIANGLES, 0, 6 * 2 * 3) // 6 sides, 2 triangles, 3 points each
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window.GLSwap()
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running = handleEvents(running, window)
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sdl.Delay(16)
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}
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}
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func setupLogging() {
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file, err := os.OpenFile(LogFile, os.O_APPEND|os.O_CREATE|os.O_WRONLY, 0644)
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if err != nil {
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log.Fatal(err)
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}
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log.SetOutput(file)
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log.Println("=== START ===")
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}
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func drawSDLRenderer(renderer *sdl.Renderer) {
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renderer.SetDrawColor(0, 0, 0, 255)
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renderer.Clear()
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rect := sdl.Rect{0, 0, 100, 100}
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renderer.SetDrawColor(0, 0, 255, 255)
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renderer.DrawRect(&rect)
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renderer.Present()
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}
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func handleEvents(running bool, window *sdl.Window) bool {
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for event := sdl.PollEvent(); event != nil; event = sdl.PollEvent() {
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switch t := event.(type) {
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case *sdl.QuitEvent:
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fmt.Printf("Quit")
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running = false
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case *sdl.MouseMotionEvent:
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fmt.Printf("[%d ms] MouseMotion\ttype:%d\tid:%d\tx:%d\ty:%d\txrel:%d\tyrel:%d\n",
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t.Timestamp, t.Type, t.Which, t.X, t.Y, t.XRel, t.YRel)
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case *sdl.MouseButtonEvent:
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fmt.Printf("[%d ms] MouseButton\ttype:%d\tid:%d\tx:%d\ty:%d\tbutton:%d\tstate:%d\n",
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t.Timestamp, t.Type, t.Which, t.X, t.Y, t.Button, t.State)
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case *sdl.MouseWheelEvent:
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fmt.Printf("[%d ms] MouseWheel\ttype:%d\tid:%d\tx:%d\ty:%d\n",
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t.Timestamp, t.Type, t.Which, t.X, t.Y)
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case *sdl.KeyboardEvent:
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if t.Keysym.Sym == sdl.K_ESCAPE {
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fmt.Print("Esc quitting\n")
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running = false
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}
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if t.Keysym.Sym == sdl.K_f {
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window.SetFullscreen(FullscreenWindowFlags)
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}
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if t.Keysym.Sym == sdl.K_g {
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window.SetFullscreen(DefaultWindowFlags)
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}
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}
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}
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return running
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}
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var cubeVertices = []float32{
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// X, Y, Z, texture U, V
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// Bottom
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-1.0, -1.0, -1.0, 0.0, 0.0,
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1.0, -1.0, -1.0, 1.0, 0.0,
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-1.0, -1.0, 1.0, 0.0, 1.0,
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1.0, -1.0, -1.0, 1.0, 0.0,
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1.0, -1.0, 1.0, 1.0, 1.0,
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-1.0, -1.0, 1.0, 0.0, 1.0,
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// Top
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-1.0, 1.0, -1.0, 0.0, 0.0,
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-1.0, 1.0, 1.0, 0.0, 1.0,
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1.0, 1.0, -1.0, 1.0, 0.0,
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1.0, 1.0, -1.0, 1.0, 0.0,
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-1.0, 1.0, 1.0, 0.0, 1.0,
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1.0, 1.0, 1.0, 1.0, 1.0,
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// Front
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-1.0, -1.0, 1.0, 1.0, 0.0,
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1.0, -1.0, 1.0, 0.0, 0.0,
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-1.0, 1.0, 1.0, 1.0, 1.0,
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1.0, -1.0, 1.0, 0.0, 0.0,
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1.0, 1.0, 1.0, 0.0, 1.0,
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-1.0, 1.0, 1.0, 1.0, 1.0,
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|
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// Back
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-1.0, -1.0, -1.0, 0.0, 0.0,
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-1.0, 1.0, -1.0, 0.0, 1.0,
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1.0, -1.0, -1.0, 1.0, 0.0,
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1.0, -1.0, -1.0, 1.0, 0.0,
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-1.0, 1.0, -1.0, 0.0, 1.0,
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1.0, 1.0, -1.0, 1.0, 1.0,
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// Left
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-1.0, -1.0, 1.0, 0.0, 1.0,
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-1.0, 1.0, -1.0, 1.0, 0.0,
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-1.0, -1.0, -1.0, 0.0, 0.0,
|
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-1.0, -1.0, 1.0, 0.0, 1.0,
|
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-1.0, 1.0, 1.0, 1.0, 1.0,
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-1.0, 1.0, -1.0, 1.0, 0.0,
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|
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// Right
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1.0, -1.0, 1.0, 1.0, 1.0,
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1.0, -1.0, -1.0, 1.0, 0.0,
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1.0, 1.0, -1.0, 0.0, 0.0,
|
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1.0, -1.0, 1.0, 1.0, 1.0,
|
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1.0, 1.0, -1.0, 0.0, 0.0,
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1.0, 1.0, 1.0, 0.0, 1.0,
|
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}
|
||||
|
||||
var vertexShader = `
|
||||
#version 330
|
||||
uniform mat4 projection;
|
||||
uniform mat4 camera;
|
||||
uniform mat4 model;
|
||||
in vec3 vert;
|
||||
in vec2 vertTexCoord;
|
||||
out vec2 fragTexCoord;
|
||||
void main() {
|
||||
fragTexCoord = vertTexCoord;
|
||||
gl_Position = projection * camera * model * vec4(vert, 1);
|
||||
}
|
||||
` + "\x00"
|
||||
|
||||
var fragmentShader = `
|
||||
#version 330
|
||||
uniform sampler2D tex;
|
||||
in vec2 fragTexCoord;
|
||||
out vec4 outputColor;
|
||||
void main() {
|
||||
outputColor = texture(tex, fragTexCoord);
|
||||
}
|
||||
` + "\x00"
|
||||
Loading…
Reference in New Issue