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[libgdx] Inlined line intersection in clipper, faster on Android

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This commit is contained in:
badlogic 2017-03-28 18:53:16 +02:00
parent 7245115a63
commit a665b0e598
1 changed files with 20 additions and 16 deletions
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36
spine-libgdx/spine-libgdx/src/com/esotericsoftware/spine/utils/SutherlandHodgmanClipper.java
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@ -64,8 +64,16 @@ public class SutherlandHodgmanClipper {
output.add(inputY2);
}
// v1 inside, v2 outside
else {
intersectLines(edgeX, edgeY, edgeX2, edgeY2, inputX, inputY, inputX2, inputY2, output);
else {
float c0 = inputY2 - inputY;
float c1 = edgeX2 - edgeX;
float c2 = inputX2 - inputX;
float c3 = edgeY2 - edgeY;
float d = c0 * c1 - c2 * c3;
float ua = (c2 * (edgeY - inputY) - c0 * (edgeX - inputX)) / d;
output.add(edgeX + (edgeX2 - edgeX) * ua);
output.add(edgeY + (edgeY2 - edgeY) * ua);
clipped = true;
}
} else {
@ -77,7 +85,16 @@ public class SutherlandHodgmanClipper {
}
// v1 outside, v2 inside
else {
intersectLines(edgeX, edgeY, edgeX2, edgeY2, inputX, inputY, inputX2, inputY2, output);
float c0 = inputY2 - inputY;
float c1 = edgeX2 - edgeX;
float c2 = inputX2 - inputX;
float c3 = edgeY2 - edgeY;
float d = c0 * c1 - c2 * c3;
float ua = (c2 * (edgeY - inputY) - c0 * (edgeX - inputX)) / d;
output.add(edgeX + (edgeX2 - edgeX) * ua);
output.add(edgeY + (edgeY2 - edgeY) * ua);
output.add(inputX2);
output.add(inputY2);
clipped = true;
@ -111,19 +128,6 @@ public class SutherlandHodgmanClipper {
return clipped;
}
public static void intersectLines (float x1, float y1, float x2, float y2, float x3, float y3, float x4, float y4,
FloatArray output) {
float c0 = y4 - y3;
float c1 = x2 - x1;
float c2 = x4 - x3;
float c3 = y2 - y1;
float d = c0 * c1 - c2 * c3;
float ua = (c2 * (y1 - y3) - c0 * (x1 - x3)) / d;
output.add(x1 + (x2 - x1) * ua);
output.add(y1 + (y2 - y1) * ua);
}
public static void makeClockwise (FloatArray poly) {
if (clockwise(poly)) return;