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This commit is contained in:
Carlos Sanchez 2024-07-23 23:46:18 -04:00
parent a8a90ea32b
commit 4820995ad4
2 changed files with 56 additions and 28 deletions
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60
tinyrender1/main.go
View File

@ -5,15 +5,14 @@ import (
"fmt" "fmt"
"log" "log"
"os" "os"
"runtime/pprof" // For performance whatever "runtime/pprof" // For performance profiling (unnecessary)
// "github.com/udhos/gwob"
) )
const ( const (
Width = 512 Width = 512
Height = 512 Height = 512
ObjectFile = "head.obj" ObjectFile = "head.obj"
//LineRepeat = 1_000_000 Repeat = 1_000
) )
func must(err error) { func must(err error) {
@ -49,34 +48,63 @@ func main() {
defer of.Close() defer of.Close()
o, err := ParseObj(of) o, err := ParseObj(of)
must(err) must(err)
// gwobopts := &gwob.ObjParserOptions {}
// o, err := gwob.NewObjFromFile(ObjectFile, gwobopts)
// must(err)
log.Printf("Running render") log.Printf("Running render")
halfwidth := float32(fb.Width / 2)
halfheight := float32(fb.Height / 2)
var x [3]int
var y [3]int
var wi = int(fb.Width - 1)
var hi = int(fb.Height - 1)
for range Repeat {
for _, f := range o.Faces { for _, f := range o.Faces {
log.Printf("%v", f)
for i := range 3 { // Triangles, bro for i := range 3 { // Triangles, bro
v0 := f[i] x[i] = int((f[i].X + 1) * halfwidth)
v1 := f[(i+1)%3] y[i] = hi - int((f[i].Y+1)*halfheight)
x0 := int((v0.X + 1) * float32(fb.Width/2)) if x[i] > wi {
y0 := int((v0.Y + 1) * float32(fb.Height/2)) x[i] = wi
x1 := int((v1.X + 1) * float32(fb.Width/2)) } else if x[i] < 0 {
y1 := int((v1.Y + 1) * float32(fb.Height/2)) x[i] = 0
Bresenham2(&fb, 0xFFFFFF, x0, int(fb.Height)-y0, x1, int(fb.Height)-y1)
} }
if y[i] > hi {
y[i] = hi
} else if y[i] < 0 {
y[i] = 0
}
}
Bresenham2(&fb, 0xFFFFFF, x[0], y[0], x[1], y[1])
Bresenham2(&fb, 0xFFFFFF, x[1], y[1], x[2], y[2])
Bresenham2(&fb, 0xFFFFFF, x[2], y[2], x[0], y[0])
// x0 := int((f[0].X + 1) * halfwidth)
// y0 := int((f[0].Y + 1) * halfheight)
// x1 := int((f[1].X + 1) * halfwidth)
// y1 := int((f[1].Y + 1) * halfheight)
// x2 := int((f[2].X + 1) * halfwidth)
// y2 := int((f[2].Y + 1) * halfheight)
// Bresenham2(&fb, 0xFFFFFF, x0, int(fb.Height)-y0, x1, int(fb.Height)-y1)
// for i := range 3 { // Triangles, bro
// Bresenham2(&fb, 0xFFFFFF, x0, int(fb.Height)-y0, x1, int(fb.Height)-y1)
// // v0 := f[i]
// // v1 := f[(i+1)%3]
// // x0 := int((v0.X + 1) * halfwidth)
// // y0 := int((v0.Y + 1) * halfheight)
// // x1 := int((v1.X + 1) * halfwidth)
// // y1 := int((v1.Y + 1) * halfheight)
// Bresenham2(&fb, 0xFFFFFF, x0, int(fb.Height)-y0, x1, int(fb.Height)-y1)
// }
} }
// Just draw a simple line (a million times or something) // Just draw a simple line (a million times or something)
// for range LineRepeat {
// // LineDumb5(&fb, 0xFFFFFF, 100, 100, 350, 200) // // LineDumb5(&fb, 0xFFFFFF, 100, 100, 350, 200)
// // LineDumb5(&fb, 0xFF0000, 120, 100, 200, 350) // // LineDumb5(&fb, 0xFF0000, 120, 100, 200, 350)
// // LineDumb5(&fb, 0xFF0000, 350, 200, 100, 100) // backward first line // // LineDumb5(&fb, 0xFF0000, 350, 200, 100, 100) // backward first line
// Bresenham2(&fb, 0xFFFFFF, 100, 100, 350, 200) // Bresenham2(&fb, 0xFFFFFF, 100, 100, 350, 200)
// Bresenham2(&fb, 0xFF0000, 120, 100, 200, 350) // Bresenham2(&fb, 0xFF0000, 120, 100, 200, 350)
// Bresenham2(&fb, 0xFF0000, 350, 200, 100, 100) // backward first line // Bresenham2(&fb, 0xFF0000, 350, 200, 100, 100) // backward first line
// } }
log.Printf("Exporting ppm to stdout") log.Printf("Exporting ppm to stdout")
fmt.Print(fb.ExportPPM()) fmt.Print(fb.ExportPPM())

2
tinyrender1/render.go
View File

@ -173,7 +173,7 @@ func Bresenham2(fb *Framebuffer, color uint, x0 int, y0 int, x1 int, y1 int) {
err := dx + dy err := dx + dy
for { for {
fb.SetSafe(uint(x0), uint(y0), color) fb.Set(uint(x0), uint(y0), color)
if x0 == x1 && y0 == y1 { if x0 == x1 && y0 == y1 {
break break
} }