mat4x4 CreateProjectionMatrix( float fovy,
float aspect_ratio,
float near_plane,
float far_plane )
{
mat4x4 out = { { 0 } };
const float y_scale = Cotangent(DegreesToRadians(fovy / 2));
const float x_scale = y_scale / aspect_ratio;
const float frustum_length = far_plane - near_plane;
out.m[0] = x_scale;
out.m[5] = y_scale;
out.m[10] = -((far_plane + near_plane) / frustum_length);
out.m[11] = -1;
out.m[14] = -((2 * near_plane * far_plane) / frustum_length);
return out;
}
Matrix CreateProjectionMatrix(
float fovy,
float aspect_ratio,
float near_plane,
float far_plane
)
{
Matrix out = { { 0 } };
const float
y_scale = Cotangent((fovy*M_PI/180) / 2),
x_scale = y_scale / aspect_ratio,
frustum_length = far_plane - near_plane;
out.m[0] = x_scale;
out.m[5] = y_scale;
out.m[10] = -((far_plane + near_plane) / frustum_length);
out.m[11] = -1;
out.m[14] = -((2 * near_plane * far_plane) / frustum_length);
return out;
}
