Restore user clip planes in a form compatible with modern OpenGL

[libs/gl.git] / source / clipping.cpp

diff --git a/source/clipping.cpp b/source/clipping.cpp
new file mode 100644 (file)
index 0000000..add7bba
--- /dev/null
+++ b/source/clipping.cpp
@@ -0,0 +1,105 @@
+#include <msp/gl/extensions/msp_legacy_features.h>
+#include "clipping.h"
+#include "clipplane.h"
+#include "clipunit.h"
+#include "matrix.h"
+#include "misc.h"
+
+using namespace std;
+
+namespace Msp {
+namespace GL {
+
+bool Clipping::bound_with_legacy = false;
+
+void Clipping::attach(unsigned i, const ClipPlane &p)
+{
+       if(i>=ClipUnit::get_n_units())
+               throw out_of_range("Clipping::attach");
+
+       if(i>=planes.size())
+               planes.resize(i+1);
+
+       planes[i] = &p;
+       if(current()==this)
+       {
+               if(bound_with_legacy)
+                       p.bind_to(i);
+               else
+                       glEnable(GL_CLIP_PLANE0+i);
+       }
+}
+
+void Clipping::detach(unsigned i)
+{
+       if(i>=planes.size())
+               return;
+
+       planes[i] = 0;
+       if(current()==this)
+       {
+               if(bound_with_legacy)
+                       ClipPlane::unbind_from(i);
+               else
+                       disable(GL_CLIP_PLANE0+i);
+       }
+}
+
+void Clipping::update_shader_data(ProgramData &shdata, const Matrix &view_matrix) const
+{
+       Matrix view_inverse = invert(view_matrix);
+       for(unsigned i=0; i<planes.size(); ++i)
+               if(planes[i])
+                       planes[i]->update_shader_data(shdata, view_inverse, i);
+}
+
+void Clipping::bind(bool legacy) const
+{
+       if(legacy)
+               static Require _req(MSP_legacy_features);
+
+       const Clipping *old = current();
+       if(!set_current(this))
+               return;
+
+       bound_with_legacy = legacy;
+       if(legacy)
+       {
+               for(unsigned i=0; i<planes.size(); ++i)
+               {
+                       if(planes[i])
+                               planes[i]->bind_to(i);
+                       else
+                               ClipPlane::unbind_from(i);
+               }
+
+               if(old)
+               {
+                       for(unsigned i=planes.size(); i<old->planes.size(); ++i)
+                               ClipPlane::unbind_from(i);
+               }
+       }
+       else
+       {
+               for(unsigned i=0; i<planes.size(); ++i)
+               {
+                       if(planes[i])
+                               enable(GL_CLIP_PLANE0+i);
+                       else
+                               disable(GL_CLIP_PLANE0+i);
+               }
+
+               if(old)
+               {
+                       for(unsigned i=planes.size(); i<old->planes.size(); ++i)
+                               disable(GL_CLIP_PLANE0+i);
+               }
+       }
+}
+
+void Clipping::unbind()
+{
+}
+
+} // namespace GL
+} // namespace Msp