haloopdy/3dtrial
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So broken lol

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This commit is contained in:
Carlos Sanchez 2024-07-26 19:45:12 -04:00
parent e473fe838f
commit 00aedc5531
1 changed files with 7 additions and 11 deletions
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18
tinyrender2/render.go
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@ -60,15 +60,6 @@ func Triangle1(fb *Framebuffer, color uint, v0 Vec2i, v1 Vec2i, v2 Vec2i) {
v1, v2 = v2, v1 v1, v2 = v2, v1
} }
// The lesson says to always figure out what's on the left.
// As such, we always go from left to right
// While drawing the straight line, go the opposite direction if the
// longer side is on the right (we go from long side to short)
var sweep int = 1
if v2.X > v1.X {
sweep = -1
}
// Don't worry about speed for now... // Don't worry about speed for now...
dy := float32(v2.Y-v0.Y) - 0.5 dy := float32(v2.Y-v0.Y) - 0.5
var v02step, v01step, v12step, xlong, xshort float32 var v02step, v01step, v12step, xlong, xshort float32
@ -88,8 +79,13 @@ func Triangle1(fb *Framebuffer, color uint, v0 Vec2i, v1 Vec2i, v2 Vec2i) {
} }
for y := v0.Y; y <= v2.Y; y++ { for y := v0.Y; y <= v2.Y; y++ {
// Draw a horizontal line from xleft := int(math.Floor(float64(xshort)))
for x := int(math.Floor(float64(xlong))); x <= int(math.Floor(float64(xshort))); x += sweep { xright := int(math.Floor(float64(xlong)))
if xleft > xright {
xleft, xright = xright, xleft
}
// Draw a horizontal line from elft to right
for x := xleft; x <= xright; x++ {
fb.SetSafe(uint(x), uint(y), color) fb.SetSafe(uint(x), uint(y), color)
} }
xlong += v02step xlong += v02step