GLfloat nearval, GLfloat farval );
extern void
-_math_matrix_viewport(GLmatrix *m, GLint x, GLint y, GLint width, GLint height,
+_math_matrix_viewport(GLmatrix *m, GLfloat x, GLfloat y, GLfloat width, GLfloat height,
GLdouble zNear, GLdouble zFar, GLdouble depthMax);
extern void