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This commit is contained in:
Carlos Sanchez 2024-07-26 23:52:48 -04:00
parent 0a0d4436e7
commit 0683976241
1 changed files with 32 additions and 24 deletions
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56
tinyrender2/render.go
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@ -87,9 +87,12 @@ func Triangle1(fb *Framebuffer, color uint, v0 Vec2i, v1 Vec2i, v2 Vec2i) {
if xleft > xright {
xleft, xright = xright, xleft
}
if xleft < 0 || xright >= int(fb.Width) {
continue
}
// Draw a horizontal line from left to right
for x := xleft; x <= xright; x++ {
fb.SetSafe(uint(x), uint(y), color)
fb.Set(uint(x), uint(y), color)
}
xlong += v02step
if y < v1.Y {
@ -134,38 +137,43 @@ func EdgeIncrement(v1, v2 Vec2f) (float32, float32) {
func Triangle2(fb *Framebuffer, color uint, v0 Vec2i, v1 Vec2i, v2 Vec2i) {
boundsTL, boundsBR := ComputeBoundingBox(v0, v1, v2)
const expand = (2 << 12)
if boundsTL.Y < 0 {
boundsTL.Y = 0
}
if boundsTL.X < 0 {
boundsTL.X = 0
}
if boundsBR.Y >= int(fb.Height) {
boundsBR.Y = int(fb.Height - 1)
}
if boundsBR.X >= int(fb.Width) {
boundsBR.X = int(fb.Width - 1)
}
// Where to start our scanning
pstart := Vec2f{float32(boundsTL.X) + 0.5, float32(boundsTL.Y) + 0.5}
//log.Print(boundsTL, boundsBR)
v0f := v0.ToF()
v1f := v1.ToF()
v2f := v2.ToF()
// Where to start our scanning
pstart := Vec2f{float32(boundsTL.X) + 0.5, float32(boundsTL.Y) + 0.5}
// parea := EdgeFunction(v0f, v1f, v2f)
// invarea := 1 / parea
w0_y := int(expand * EdgeFunction(v1f, v2f, pstart))
w1_y := int(expand * EdgeFunction(v2f, v0f, pstart))
w2_y := int(expand * EdgeFunction(v0f, v1f, pstart))
w0_xit, w0_yit := EdgeIncrement(v1f, v2f)
w1_xit, w1_yit := EdgeIncrement(v2f, v0f)
w2_xit, w2_yit := EdgeIncrement(v0f, v1f)
w0_xi := int(expand * w0_xit)
w0_yi := int(expand * w0_yit)
w1_xi := int(expand * w1_xit)
w1_yi := int(expand * w1_yit)
w2_xi := int(expand * w2_xit)
w2_yi := int(expand * w2_yit)
parea := EdgeFunction(v0f, v1f, v2f)
invarea := 1 / parea
w0_y := EdgeFunction(v1f, v2f, pstart)
w1_y := EdgeFunction(v2f, v0f, pstart)
w2_y := EdgeFunction(v0f, v1f, pstart)
w0_xi, w0_yi := EdgeIncrement(v1f, v2f)
w1_xi, w1_yi := EdgeIncrement(v2f, v0f)
w2_xi, w2_yi := EdgeIncrement(v0f, v1f)
for y := boundsTL.Y; y <= boundsBR.Y; y++ {
for y := uint(boundsTL.Y); y <= uint(boundsBR.Y); y++ {
w0 := w0_y
w1 := w1_y
w2 := w2_y
for x := boundsTL.X; x <= boundsBR.X; x++ {
for x := uint(boundsTL.X); x <= uint(boundsBR.X); x++ {
if w0 >= 0 && w1 >= 0 && w2 >= 0 {
fb.SetSafe(uint(x), uint(y), color)
// w0a := w0 * invarea
// w1a := w1 * invarea
// w2a := w2 * invarea
w0a := w0 * invarea
w1a := w1 * invarea
w2a := w2 * invarea
fb.Set(x, y, Col2Uint(byte(255*w0a), byte(255*w1a), byte(255*w2a)))
}
w0 += w0_xi
w1 += w1_xi