+#include <msp/strings/format.h>
+#include "clipplane.h"
+#include "clipunit.h"
+#include "gl.h"
+#include "matrix.h"
+#include "misc.h"
+#include "programdata.h"
+
+namespace Msp {
+namespace GL {
+
+ClipPlane::ClipPlane():
+ eq(0, 0, 0, 1)
+{ }
+
+ClipPlane::ClipPlane(const Vector4 &e):
+ eq(e)
+{ }
+
+ClipPlane::ClipPlane(const Vector3 &p, const Vector3 &d):
+ eq(compose(d, -dot(p, d)))
+{ }
+
+void ClipPlane::update(unsigned index) const
+{
+ double deq[4];
+ for(unsigned i=0; i<4; ++i)
+ deq[i] = eq[i];
+ glClipPlane(GL_CLIP_PLANE0+index, deq);
+}
+
+void ClipPlane::set_equation(const Vector4 &e)
+{
+ eq = e;
+ if(ClipUnit *unit = ClipUnit::find_unit(this))
+ update(unit->get_index());
+}
+
+void ClipPlane::set_plane(const Vector3 &p, const Vector3 &d)
+{
+ Vector3 nd = normalize(d);
+ set_equation(compose(nd, -dot(p, nd)));
+}
+
+void ClipPlane::update_shader_data(ProgramData &shdata, const Matrix &view_inverse, unsigned i) const
+{
+ shdata.uniform(format("clip_planes[%d].equation", i), eq*view_inverse);
+}
+
+void ClipPlane::bind_to(unsigned i) const
+{
+ ClipUnit &unit = ClipUnit::get_unit(i);
+ if(unit.set_plane(this))
+ {
+ enable(GL_CLIP_PLANE0+unit.get_index());
+ update(unit.get_index());
+ }
+}
+
+void ClipPlane::unbind_from(unsigned i)
+{
+ ClipUnit &unit = ClipUnit::get_unit(i);
+ if(unit.set_plane(0))
+ disable(GL_CLIP_PLANE0+unit.get_index());
+}
+
+} // namespace GL
+} // namespace Msp