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Remove screen matrix transform, use normal math

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This commit is contained in:
Carlos Sanchez 2024-08-03 00:34:28 -04:00
parent 4474f3e1bc
commit 45d931c89e
2 changed files with 14 additions and 4 deletions
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7
renderer2/hrend/math.go
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@ -149,6 +149,13 @@ func (m *Mat44f) SetViewport(tl Vec3f, br Vec3f) { //width, height, depth int) {
//m.Set(2, 3, (br.Z+tl.Z)/2)
}
// Convert the point to a viewport point
func (v *Vec3f) ViewportSelf(width, height int) {
v.X = (v.X + 1) / 2 * float32(width)
v.Y = (1 - (v.Y+1)/2) * float32(height)
// Don't touch Z
}
func (m *Mat44f) SetViewportSimple(width, height, depth int) {
var tl Vec3f // All zero
br := Vec3f{

11
renderer2/main.go
View File

@ -210,9 +210,9 @@ func main() {
objects[len(objects)-1].Pos.Z -= 2
// These don't really change
var projection, viewport hrend.Mat44f
var projection hrend.Mat44f //, viewport hrend.Mat44f
projection.SetProjection(float32(*fov), float32(Width)/float32(Height), NearClip, FarClip)
viewport.SetViewportSimple(int(Width), int(Height), 1) //65535)
//viewport.SetViewportSimple(int(Width), int(Height), 1) //65535)
var camera hrend.Mat44f
var newcamtrans hrend.Vec3f
@ -234,7 +234,7 @@ func main() {
camtrans = *camtrans.Add(&newcamtrans)
_ = camera.SetCamera(&camtrans, yaw, pitch, &camup)
screenmat := camera.Inverse().Multiply(&projection)
screenmat = screenmat.Multiply(&viewport)
//screenmat = screenmat.Multiply(&viewport)
rb.ResetZBuffer()
for y := range Height {
@ -253,7 +253,6 @@ func main() {
modelmat.SetLookAt(&o.Pos, o.Pos.Add(&o.LookVec), &camup)
modelmat.ScaleSelf(o.Scale)
matrix3d := modelmat.Multiply(screenmat)
//matrix3d.ScaleSelf(o.Scale)
for _, f := range o.Model.Faces {
for i := range 3 {
sc[i] = f[i]
@ -264,6 +263,10 @@ func main() {
log.Print(o.Model.Faces[0][0].Pos, o.Model.Faces[0][1].Pos, o.Model.Faces[0][2].Pos)
log.Print(sc[0].Pos, sc[1].Pos, sc[2].Pos)
log.Print(matrix3d)
for i := range 3 {
// Perspective divide (?) and screen coord
sc[i].Pos.ViewportSelf(*width, *height)
}
//log.Print(sc[0].Pos, sc[1].Pos, sc[2].Pos, matrix3d)
if o.Lighting {
l1 := f[2].Pos.Sub(&f[0].Pos)