Function genclipmatrix

source/src/rendergl.cpp:612–627

glmatrixf clipmatrix;

void genclipmatrix(float a, float b, float c, float d)
{
    // transform the clip plane into camera space
    float clip[4];
    loopi(4) clip[i] = a*invmvmatrix[i*4 + 0] + b*invmvmatrix[i*4 + 1] + c*invmvmatrix[i*4 + 2] + d*invmvmatrix[i*4 + 3];

    float x = ((clip[0]<0 ? -1 : (clip[0]>0 ? 1 : 0)) + projmatrix[8]) / projmatrix[0],
          y = ((clip[1]<0 ? -1 : (clip[1]>0 ? 1 : 0)) + projmatrix[9]) / projmatrix[5],
          w = (1 + projmatrix[10]) / projmatrix[14],
          scale = 2 / (x*clip[0] + y*clip[1] - clip[2] + w*clip[3]);
    clipmatrix = projmatrix;
    clipmatrix[2] = clip[0]*scale;
    clipmatrix[6] = clip[1]*scale;
    clipmatrix[10] = clip[2]*scale + 1.0f;
    clipmatrix[14] = clip[3]*scale;
}

bool reflecting = false, refracting = false;
GLuint reflecttex = 0, refracttex = 0;