2024-07-30 23:14:28 +00:00
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package main
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import (
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2024-07-30 23:47:22 +00:00
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"flag"
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"image"
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2024-07-30 23:47:22 +00:00
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"log"
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"os"
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"renderer1/hrend"
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"runtime/pprof" // For performance profiling (unnecessary)
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2024-07-31 03:17:00 +00:00
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_ "image/jpeg"
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2024-07-30 23:14:28 +00:00
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rl "github.com/gen2brain/raylib-go/raylib"
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)
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2024-07-30 23:47:22 +00:00
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const (
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Width = 640
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Height = 480
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NearClip = 0.1
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FarClip = 100
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FOV = 90.0
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ZOffset = -1.5
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ObjectFile = "head.obj"
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TextureFile = "../head.jpg"
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)
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func must(err error) {
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if err != nil {
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panic(err)
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}
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}
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2024-07-31 03:17:00 +00:00
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func loadDefault() (*hrend.ObjModel, hrend.Framebuffer) {
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log.Printf("Loading obj %s, texture %s", ObjectFile, TextureFile)
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of, err := os.Open(ObjectFile)
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must(err)
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defer of.Close()
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o, err := hrend.ParseObj(of)
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must(err)
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jf, err := os.Open(TextureFile)
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must(err)
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defer jf.Close()
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timg, _, err := image.Decode(jf)
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must(err)
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texture := hrend.NewTexture(timg, 4)
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return o, texture
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}
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2024-07-30 23:47:22 +00:00
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// However flag works... idk
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var cpuprofile = flag.String("cpuprofile", "", "write cpu profile to file")
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// var dozbuf = flag.Bool("zbuffer", false, "Write zbuffer instead of image")
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// var p6file = flag.String("p6file", "", "Output binary ppm to given file instead")
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// var fov = flag.Float64("fov", 90, "Horizontal FOV in degrees")
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// var xofs = flag.Float64("xofs", 0, "Offset image by x")
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// var zofs = flag.Float64("zofs", -1.5, "Offset image by z (should be negative)")
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// var repeat = flag.Int("repeat", 60, "Amount of times to repeat render")
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2024-07-30 23:14:28 +00:00
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func main() {
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log.Printf("Program start")
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flag.Parse()
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if *cpuprofile != "" {
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log.Printf("CPU profiling requested, write to %s", *cpuprofile)
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f, err := os.Create(*cpuprofile)
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must(err)
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defer f.Close()
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err = pprof.StartCPUProfile(f)
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must(err)
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defer pprof.StopCPUProfile()
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}
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2024-07-31 03:17:00 +00:00
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fb := NewRaylibBuffer(Width, Height)
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rb := hrend.NewRenderbuffer(fb, Width, Height)
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o, texture := loadDefault()
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light := hrend.Vec3f{0, 0, -1}
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var projection, worldToCamera, viewport hrend.Mat44f
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2024-07-30 23:47:22 +00:00
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rl.InitWindow(Width, Height, "Simple renderer with raylib")
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2024-07-30 23:14:28 +00:00
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defer rl.CloseWindow()
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rl.SetTargetFPS(60)
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2024-07-30 23:47:22 +00:00
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var thing hrend.Vec2i
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log.Print(thing)
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2024-07-30 23:14:28 +00:00
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for !rl.WindowShouldClose() {
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rl.BeginDrawing()
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2024-07-31 03:17:00 +00:00
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screenmat := worldToCamera.Multiply(&projection)
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screenmat = screenmat.Multiply(&viewport)
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var sc [3]hrend.Vertex
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rb.ResetZBuffer()
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for _, f := range o.Faces {
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// Precompute perspective for vertices to save time. Notice Z
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// is not considered: is this orthographic projection? Yeah probably...
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var fpt [3]hrend.Vec3f
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for i := range 3 { // Triangles, bro
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sc[i] = f[i]
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sc[i].Pos = screenmat.MultiplyPoint3(f[i].Pos)
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fpt[i] = worldToCamera.MultiplyPoint3(f[i].Pos)
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}
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l1 := fpt[2].Sub(fpt[0])
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n := l1.CrossProduct(fpt[1].Sub(fpt[0]))
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n = n.Normalize()
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intensity := n.MultSimp(&light)
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if intensity > 0 {
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hrend.TriangleTextured(&rb, texture, intensity, sc[0], sc[1], sc[2])
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}
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}
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2024-07-30 23:14:28 +00:00
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rl.ClearBackground(rl.RayWhite)
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rl.DrawText("Congrats! You created your first window!", 190, 200, 20, rl.LightGray)
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rl.EndDrawing()
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}
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}
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