static void setupRotationMatrix (float *matrix) {
// This borrows heavily from the code in render.c
float xRotMat[16], zRotMat[16];
// Storage for precalculated trig function results
float sinX, cosX, sinY, cosY, sinZ, cosZ;
glmatrix_identity(xRotMat);
glmatrix_identity(zRotMat);
// Calculate the trig functions
cosX = cos(camera.angleRad[_X]);
sinX = sin(camera.angleRad[_X]);
/*
sinY = sin(camera.angleRad[_Y]);
cosY = cos(camera.angleRad[_Y]);
*/
cosZ = cos(camera.angleRad[_Z]);
sinZ = sin(camera.angleRad[_Z]);
// Build the x rotation matrix
xRotMat[5] = cosX;
xRotMat[6] = sinX;
xRotMat[9] = -sinX;
xRotMat[10] = cosX;
// Build the Z rotation matrix
zRotMat[0] = cosZ;
zRotMat[1] = -sinZ;
zRotMat[4] = sinZ;
zRotMat[5] = -cosZ;
multiplyMats16f(zRotMat, xRotMat, matrix);
}
static void camera_init()
{
VectorClear(camera.position);
VectorClear(camera.angles_deg);
VectorClear(camera.angles_rad);
glmatrix_identity(xRotMatrix);
glmatrix_identity(yRotMatrix);
glmatrix_identity(zRotMatrix);
glmatrix_identity(translateMatrix);
}
