4jcraft/Minecraft.Client/Rendering/FrustumData.cpp

#include "../Platform/stdafx.h"
#include "FrustumData.h"

float** m_Frustum;

FrustumData::FrustumData() {
    m_Frustum = new float*[16];
    for (int i = 0; i < 16; i++) m_Frustum[i] = new float[16];
    proj = floatArray(16);
    modl = floatArray(16);
    clip = floatArray(16);
}

FrustumData::~FrustumData() {
    delete[] proj.data;
    delete[] modl.data;
    delete[] clip.data;
    for (int i = 0; i < 16; i++) delete[] m_Frustum[i];
    delete[] m_Frustum;
}

bool FrustumData::pointInFrustum(float x, float y, float z) {
    for (int i = 0; i < 6; i++) {
        if (m_Frustum[i][A] * x + m_Frustum[i][B] * y + m_Frustum[i][C] * z +
                m_Frustum[i][D] <=
            0) {
            return false;
        }
    }

    return true;
}

bool FrustumData::sphereInFrustum(float x, float y, float z, float radius) {
    for (int i = 0; i < 6; i++) {
        if (m_Frustum[i][A] * x + m_Frustum[i][B] * y + m_Frustum[i][C] * z +
                m_Frustum[i][D] <=
            -radius) {
            return false;
        }
    }

    return true;
}

bool FrustumData::cubeFullyInFrustum(double x1, double y1, double z1, double x2,
                                     double y2, double z2) {
    for (int i = 0; i < 6; i++) {
        if (!(m_Frustum[i][A] * (x1) + m_Frustum[i][B] * (y1) +
                  m_Frustum[i][C] * (z1) + m_Frustum[i][D] >
              0))
            return false;
        if (!(m_Frustum[i][A] * (x2) + m_Frustum[i][B] * (y1) +
                  m_Frustum[i][C] * (z1) + m_Frustum[i][D] >
              0))
            return false;
        if (!(m_Frustum[i][A] * (x1) + m_Frustum[i][B] * (y2) +
                  m_Frustum[i][C] * (z1) + m_Frustum[i][D] >
              0))
            return false;
        if (!(m_Frustum[i][A] * (x2) + m_Frustum[i][B] * (y2) +
                  m_Frustum[i][C] * (z1) + m_Frustum[i][D] >
              0))
            return false;
        if (!(m_Frustum[i][A] * (x1) + m_Frustum[i][B] * (y1) +
                  m_Frustum[i][C] * (z2) + m_Frustum[i][D] >
              0))
            return false;
        if (!(m_Frustum[i][A] * (x2) + m_Frustum[i][B] * (y1) +
                  m_Frustum[i][C] * (z2) + m_Frustum[i][D] >
              0))
            return false;
        if (!(m_Frustum[i][A] * (x1) + m_Frustum[i][B] * (y2) +
                  m_Frustum[i][C] * (z2) + m_Frustum[i][D] >
              0))
            return false;
        if (!(m_Frustum[i][A] * (x2) + m_Frustum[i][B] * (y2) +
                  m_Frustum[i][C] * (z2) + m_Frustum[i][D] >
              0))
            return false;
    }

    return true;
}

bool FrustumData::cubeInFrustum(double x1, double y1, double z1, double x2,
                                double y2, double z2) {
    for (int i = 0; i < 6; i++) {
        if (m_Frustum[i][A] * (x1) + m_Frustum[i][B] * (y1) +
                m_Frustum[i][C] * (z1) + m_Frustum[i][D] >
            0)
            continue;
        if (m_Frustum[i][A] * (x2) + m_Frustum[i][B] * (y1) +
                m_Frustum[i][C] * (z1) + m_Frustum[i][D] >
            0)
            continue;
        if (m_Frustum[i][A] * (x1) + m_Frustum[i][B] * (y2) +
                m_Frustum[i][C] * (z1) + m_Frustum[i][D] >
            0)
            continue;
        if (m_Frustum[i][A] * (x2) + m_Frustum[i][B] * (y2) +
                m_Frustum[i][C] * (z1) + m_Frustum[i][D] >
            0)
            continue;
        if (m_Frustum[i][A] * (x1) + m_Frustum[i][B] * (y1) +
                m_Frustum[i][C] * (z2) + m_Frustum[i][D] >
            0)
            continue;
        if (m_Frustum[i][A] * (x2) + m_Frustum[i][B] * (y1) +
                m_Frustum[i][C] * (z2) + m_Frustum[i][D] >
            0)
            continue;
        if (m_Frustum[i][A] * (x1) + m_Frustum[i][B] * (y2) +
                m_Frustum[i][C] * (z2) + m_Frustum[i][D] >
            0)
            continue;
        if (m_Frustum[i][A] * (x2) + m_Frustum[i][B] * (y2) +
                m_Frustum[i][C] * (z2) + m_Frustum[i][D] >
            0)
            continue;

        return false;
    }

    return true;
}

bool FrustumData::isVisible(AABB* aabb) {
    return cubeInFrustum(aabb->x0, aabb->y0, aabb->z0, aabb->x1, aabb->y1,
                         aabb->z1);
}