Function drawreflection

source/src/rendergl.cpp:639–770

VAR(reflectscissor, 0, 1, 1);

void drawreflection(float hf, int w, int h, float changelod, bool refract)
{
    reflecting = true;
    refracting = refract;

    int size = 1<<reflectsize, sizelimit = min(hwtexsize, min(w, h));
    while(size > sizelimit) size /= 2;
    if(size!=reflectlastsize)
    {
        if(reflecttex) glDeleteTextures(1, &reflecttex);
        if(refracttex) glDeleteTextures(1, &refracttex);
        reflecttex = refracttex = 0;
    }
    if(!reflecttex || (waterrefract && !refracttex))
    {
        if(!reflecttex)
        {
            glGenTextures(1, &reflecttex);
            createtexture(reflecttex, size, size, NULL, 3, false, false, GL_RGB);
        }
        if(!refracttex)
        {
            glGenTextures(1, &refracttex);
            createtexture(refracttex, size, size, NULL, 3, false, false, GL_RGB);
        }
        reflectlastsize = size;
    }

    extern float wsx1, wsx2, wsy1, wsy2;
    int sx = 0, sy = 0, sw = size, sh = size;
    if(reflectscissor && (wsx1 > -1 || wsy1 > -1 || wsx1 < 1 || wsy1 < 1))
    {
        sx = int(floor((wsx1+1)*0.5f*size));
        sy = int(floor((wsy1+1)*0.5f*size));
        sw = int(ceil((wsx2+1)*0.5f*size)) - sx;
        sh = int(ceil((wsy2+1)*0.5f*size)) - sy;
    }
    glScissor(sx, sy, sw, sh);
    glEnable(GL_SCISSOR_TEST);

    if(!refract) glCullFace(GL_BACK);
    glViewport(0, 0, size, size);
    glClear(GL_DEPTH_BUFFER_BIT | GL_COLOR_BUFFER_BIT);

    resetcubes();

    render_world(camera1->o.x, camera1->o.y, refract ? camera1->o.z : hf, changelod,
            (int)camera1->yaw, (refract ? 1 : -1)*(int)camera1->pitch, dynfov(), fovy, size, size);

    setupstrips();

    glEnable(GL_TEXTURE_2D);

    glPushMatrix();
    if(!refract)
    {
        glTranslatef(0, 0, 2*hf);
        glScalef(1, 1, -1);