X-Git-Url: https://git.localhorst.tv/?a=blobdiff_plain;f=src%2Fgeometry%2Fgeometry.cpp;h=1e84fbb9068d1749fbe5a3edcc81519aa7718e87;hb=6513b55584093a86ce1e369e054263dd75c295c8;hp=7798d33e949362ede44727f75402832e87a286ae;hpb=69a4ba4fa3e4694887087ab6dddc784a593d2b03;p=blank.git

diff --git a/src/geometry/geometry.cpp b/src/geometry/geometry.cpp
index 7798d33..1e84fbb 100644
--- a/src/geometry/geometry.cpp
+++ b/src/geometry/geometry.cpp
@@ -4,6 +4,8 @@
 #include "rotation.hpp"
 
 #include <limits>
+#include <ostream>
+#include <glm/gtx/io.hpp>
 #include <glm/gtx/matrix_cross_product.hpp>
 #include <glm/gtx/optimum_pow.hpp>
 #include <glm/gtx/transform.hpp>
@@ -39,6 +41,14 @@ glm::mat3 find_rotation(const glm::vec3 &a, const glm::vec3 &b) noexcept {
 	return glm::mat3(1.0f) + vx + (pow2(vx) * f);
 }
 
+std::ostream &operator <<(std::ostream &out, const AABB &box) {
+	return out << "AABB(" << box.min << ", " << box.max << ')';
+}
+
+std::ostream &operator <<(std::ostream &out, const Ray &ray) {
+	return out << "Ray(" << ray.orig << ", " << ray.dir << ')';
+}
+
 bool Intersection(
 	const Ray &ray,
 	const AABB &aabb,
@@ -187,6 +197,21 @@ bool Intersection(
 }
 
 
+std::ostream &operator <<(std::ostream &out, const Plane &plane) {
+	return out << "Plane(" << plane.normal << ", " << plane.dist << ')';
+}
+
+std::ostream &operator <<(std::ostream &out, const Frustum &frustum) {
+	return out << "Frustum(" << std::endl
+		<< "\tleft:   " << frustum.plane[0] << std::endl
+		<< "\tright:  " << frustum.plane[1] << std::endl
+		<< "\tbottom: " << frustum.plane[2] << std::endl
+		<< "\ttop:    " << frustum.plane[3] << std::endl
+		<< "\tnear:   " << frustum.plane[4] << std::endl
+		<< "\tfar:    " << frustum.plane[5] << std::endl
+		<< ')';
+}
+
 bool CullTest(const AABB &box, const glm::mat4 &MVP) noexcept {
 	// transform corners into clip space
 	glm::vec4 corners[8] = {
@@ -223,4 +248,18 @@ bool CullTest(const AABB &box, const glm::mat4 &MVP) noexcept {
 	return false;
 }
 
+bool CullTest(const AABB &box, const Frustum &frustum) noexcept {
+	for (const Plane &plane : frustum.plane) {
+		const glm::vec3 np(
+			((plane.normal.x > 0.0f) ? box.max.x : box.min.x),
+			((plane.normal.y > 0.0f) ? box.max.y : box.min.y),
+			((plane.normal.z > 0.0f) ? box.max.z : box.min.z)
+		);
+		const float dp = dot(plane.normal, np);
+		// cull if nearest point is on the "outside" side of the plane
+		if (dp < -plane.dist) return true;
+	}
+	return false;
+}
+
 }