public static void setOrtho() {
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
float l = -Runtime.screen_width / 2f;
float r = -l;
float b = -Runtime.screen_height / 2f;
float t = -b;
float zn = -1;
float zf = 1;
float[] m = new float[16];
m[0] = 2f / (r - l);
m[1] = 0;
m[2] = 0;
m[3] = 0;
m[4] = 0;
m[5] = 2f / (b - t);
m[6] = 0;
m[7] = 0;
m[8] = 0;
m[9] = 0;
m[10] = 2f / (zf - zn);
m[11] = 0;
m[12] = (l + r) / (l - r) + (l * m[0]);
m[13] = (t + b) / (b - t) + (b * m[5]);
m[14] = (zf + zn) / (zn - zf);
m[15] = 1;
projection.set(m);
glLoadMatrixf(projection.get());
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
}
public static void setPerspective(float aspect, float fov, float znear, float zfar) {
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
float f = 1f / (float) Math.tan(Math.toRadians(fov) / 2f);
float zrange = znear - zfar;
float[] m = new float[16];
m[0] = f / aspect;
m[1] = 0;
m[2] = 0;
m[3] = 0;
m[4] = 0;
m[5] = f;
m[6] = 0;
m[7] = 0;
m[8] = 0;
m[9] = 0;
m[10] = (zfar + znear) / zrange;
m[11] = (zfar * znear) / zrange;
m[12] = 0;
m[13] = 0;
m[14] = -1f;
m[15] = 1;
projection.set(m);
glLoadMatrixf(projection.get());
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
}
