feat: optimized triangle testing

polygon.hpp

@@ -13,6 +13,8 @@ struct polygon {
     decimal bounding[4]; // min x, max x, min y, max y
     vec3 normals[3];
     vec3 colors[3];
+    vec3 barycentrics;
+    vec3 boundingBarycentrics;
 
     polygon(const vec3 &v1, const vec3 &v2, const vec3 &v3)
         : points{v1, v2, v3}, delta{} {}
@@ -61,13 +63,13 @@ struct polygon {
 
     vec3 avgNormal() {
         vec3 result;
-        for (int i = 0; i < 3;i++) {
+        for (int i = 0; i < 3; i++) {
             result += normals[i];
         }
         return result * decimal(0.3333);
     }
 
-    const bool contains(const vec3 &p) {
+    const bool depContains(const vec3 &p) {
         // if (skip)
         //    return false;
         for (int i = 0; i < 3; i++) {
@@ -80,6 +82,14 @@ struct polygon {
         }
         return true;
     }
+    const bool contains(const vec3 &p) {
+        if (small)
+            return true;
+        else
+            return (barycentrics[0] >= decimal(-0.01)) &&
+                   (barycentrics[1] >= decimal(-0.01)) &&
+                   (barycentrics[2] >= decimal(-0.01));
+    }
     friend std::ostream &operator<<(std::ostream &os, const polygon &p) {
         for (int i = 0; i < 3; i++) {
             os << p.points[i];
@@ -87,40 +97,37 @@ struct polygon {
         return os;
     }
 
-    vec3 calcNormal(vec3 barycentrics) {
-        vec3 result = normals[0] * barycentrics[0] +
-                      normals[1] * barycentrics[1] +
-                      normals[2] * barycentrics[2];
-        if (result.isSmall())
-            return normals[0];
-        else
-            return result.normalize();
+    vec3 calcNormal() {
+        return normals[0] * boundingBarycentrics[0] +
+               normals[1] * boundingBarycentrics[1] +
+               normals[2] * boundingBarycentrics[2];
     }
 
-    vec3 calcColor(vec3 barycentrics) {
-        return colors[0] * barycentrics[0] + colors[1] * barycentrics[1] +
-               colors[2] * barycentrics[2];
+    vec3 calcColor() {
+        return colors[0] * boundingBarycentrics[0] +
+               colors[1] * boundingBarycentrics[1] +
+               colors[2] * boundingBarycentrics[2];
     }
 
-    decimal calcDepth(vec3 barycentrics) {
-        return points[0].z() * barycentrics[0] +
-               points[1].z() * barycentrics[1] +
-               points[2].z() * barycentrics[2];
+    decimal calcDepth() {
+        return points[0].z() * boundingBarycentrics[0] +
+               points[1].z() * boundingBarycentrics[1] +
+               points[2].z() * boundingBarycentrics[2];
     }
 
-    vec3 calcBarycentric(vec3 s) {
+    void calcBarycentric(vec3 s) {
         // if (small)
         //     return vec3(decimal(0.333), decimal(0.333), decimal(0.333));
-        vec3 result;
-        result[0] = (points[1].x() - s.x()) * (points[2].y() - s.y()) -
-                    (points[2].x() - s.x()) * (points[1].y() - s.y());
-        result[1] = (points[2].x() - s.x()) * (points[0].y() - s.y()) -
-                    (points[0].x() - s.x()) * (points[2].y() - s.y());
-        result = result * baryFactor;
-        result[2] = decimal(1.0) - result[1] - result[0];
+
+        barycentrics[0] = (points[1].x() - s.x()) * (points[2].y() - s.y()) -
+                          (points[2].x() - s.x()) * (points[1].y() - s.y());
+        barycentrics[1] = (points[2].x() - s.x()) * (points[0].y() - s.y()) -
+                          (points[0].x() - s.x()) * (points[2].y() - s.y());
+        barycentrics = barycentrics * baryFactor;
+        barycentrics[2] = decimal(1.0) - barycentrics[1] - barycentrics[0];
         // return result;
-        return vec3::max(vec3::min(result, vec3(1.0, 1.0, 1.0)),
-                         vec3(0.0, 0.0, 0.0));
+        boundingBarycentrics = vec3::max(
+            vec3::min(barycentrics, vec3(1.0, 1.0, 1.0)), vec3(0.0, 0.0, 0.0));
     }
 };