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-rw-r--r--src/Frustum.cpp63
1 files changed, 63 insertions, 0 deletions
diff --git a/src/Frustum.cpp b/src/Frustum.cpp
new file mode 100644
index 0000000..dbad920
--- /dev/null
+++ b/src/Frustum.cpp
@@ -0,0 +1,63 @@
+#include "Frustum.hpp"
+
+#include <glm/gtc/type_ptr.hpp>
+
+void Frustum::NormalizePlane(FrustumSide side) {
+ float magnitude = (float)sqrt(frustum[side][A] * frustum[side][A] + frustum[side][B] * frustum[side][B] + frustum[side][C] * frustum[side][C]);
+
+ frustum[side][A] /= magnitude;
+ frustum[side][B] /= magnitude;
+ frustum[side][C] /= magnitude;
+ frustum[side][D] /= magnitude;
+}
+
+void Frustum::UpdateFrustum(const glm::mat4& vpmat) {
+ vp = vpmat;
+ float *clip = glm::value_ptr(vp);
+
+ frustum[RIGHT][A] = clip[3] - clip[0];
+ frustum[RIGHT][B] = clip[7] - clip[4];
+ frustum[RIGHT][C] = clip[11] - clip[8];
+ frustum[RIGHT][D] = clip[15] - clip[12];
+ NormalizePlane(RIGHT);
+
+
+ frustum[LEFT][A] = clip[3] + clip[0];
+ frustum[LEFT][B] = clip[7] + clip[4];
+ frustum[LEFT][C] = clip[11] + clip[8];
+ frustum[LEFT][D] = clip[15] + clip[12];
+ NormalizePlane(LEFT);
+
+ frustum[BOTTOM][A] = clip[3] + clip[1];
+ frustum[BOTTOM][B] = clip[7] + clip[5];
+ frustum[BOTTOM][C] = clip[11] + clip[9];
+ frustum[BOTTOM][D] = clip[15] + clip[13];
+ NormalizePlane(BOTTOM);
+
+ frustum[TOP][A] = clip[3] - clip[1];
+ frustum[TOP][B] = clip[7] - clip[5];
+ frustum[TOP][C] = clip[11] - clip[9];
+ frustum[TOP][D] = clip[15] - clip[13];
+ NormalizePlane(TOP);
+
+ frustum[BACK][A] = clip[3] - clip[2];
+ frustum[BACK][B] = clip[7] - clip[6];
+ frustum[BACK][C] = clip[11] - clip[10];
+ frustum[BACK][D] = clip[15] - clip[14];
+ NormalizePlane(BACK);
+
+ frustum[FRONT][A] = clip[3] + clip[2];
+ frustum[FRONT][B] = clip[7] + clip[6];
+ frustum[FRONT][C] = clip[11] + clip[10];
+ frustum[FRONT][D] = clip[15] + clip[14];
+ NormalizePlane(FRONT);
+}
+
+bool Frustum::TestPoint(VectorF point) {
+ for (int i = 0; i < 6; i++) {
+ if (frustum[i][A] * point.x + frustum[i][B] * point.y + frustum[i][C] * point.z + frustum[i][D] <= 0) {
+ return false;
+ }
+ }
+ return true;
+} \ No newline at end of file