3dtrial/tinyrender1/main.go

package main

import (
	"flag"
	"fmt"
	"log"
	"os"
	"runtime/pprof" // For performance whatever
)

const (
	Width      = 512
	Height     = 512
	LineRepeat = 1_000_000
)

func must(err error) {
	if err != nil {
		panic(err)
	}
}

// However flag works... idk
var cpuprofile = flag.String("cpuprofile", "", "write cpu profile to file")

func main() {
	log.Printf("Program start")

	// Little section for doing cpu profiling. I guess that's all you have to do?
	flag.Parse()
	if *cpuprofile != "" {
		log.Printf("CPU profiling requested, write to %s", *cpuprofile)
		f, err := os.Create(*cpuprofile)
		must(err)
		defer f.Close()
		err = pprof.StartCPUProfile(f)
		must(err)
		defer pprof.StopCPUProfile()
	}

	fb := NewFramebuffer(Width, Height)

	log.Printf("Running render")

	// Just draw a simple line (a million times or something)
	for range LineRepeat {
		LineDumb4(&fb, 0xFFFFFF, 100, 100, 350, 200)
		LineDumb4(&fb, 0xFF0000, 120, 100, 200, 350)
		LineDumb4(&fb, 0xFF0000, 350, 200, 100, 100) // backward first line
	}

	log.Printf("Exporting ppm to stdout")
	fmt.Print(fb.ExportPPM())

	log.Printf("Program end")
}