//Transformation matrix mat with a scaling
void setScale(float *mat, float xScale, float yScale, float zScale)
{
setIdentMatrix(mat,4);
mat[0] = xScale;
mat[5] = yScale;
mat[10] = zScale;
}
// Transformation matrix mat with a translation
void setTransMatrix(float *mat, float x, float y, float z) {
setIdentMatrix(mat,4);
mat[12] = x;
mat[13] = y;
mat[14] = z;
}
void Camera::zoomCam(float zoom)
{
float zoomMat[16];
setTransMatrix(zoomMat, 0.0f, 0.0f, zoom);
multiplyMatrix(zoomMat, viewMatrix);
setIdentMatrix(viewMatrix, 4);
multiplyMatrix(viewMatrix, zoomMat);
}
// Projection Matrix
void buildProjMatrix(float fov, float ratio, float nearP, float farP) {
float f = 1.0f / tan (fov * (PI / 360.0));
setIdentMatrix(projMatrix,4);
projMatrix[0] = f / ratio;
projMatrix[1 * 4 + 1] = f;
projMatrix[2 * 4 + 2] = (farP + nearP) / (nearP - farP);
projMatrix[3 * 4 + 2] = (2.0f * farP * nearP) / (nearP - farP);
projMatrix[2 * 4 + 3] = -1.0f;
projMatrix[3 * 4 + 3] = 0.0f;
}
Camera::Camera()
{
setIdentMatrix(viewMatrix, 4);
}
