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// This file contains definitions for the DrawContext class.  This class
// contains two pre-defined Parameters: o3d.view, for the viewing
// matrix, and o3d.projection, for the projection matrix.  There
// are convenience funtions for accessing these without looking them up
// by name.  These matrices are used by StandardParamMatrix4s, to implement
// the SAS transform semantics.  In addition, any user-defined
// parameters added to the DrawContext will be made "global", ie.,
// linked to all Shapes containing parameters of the same name, by
// Node::GenerateRenderTreeGroup().

#include "core/cross/draw_context.h"

namespace o3d {

const char* DrawContext::kViewParamName =
    O3D_STRING_CONSTANT("view");
const char* DrawContext::kProjectionParamName =
    O3D_STRING_CONSTANT("projection");

O3D_DEFN_CLASS(DrawContext, ParamObject);
O3D_DEFN_CLASS(ParamDrawContext, RefParamBase);

DrawContext::DrawContext(ServiceLocator* service_locator)
    : ParamObject(service_locator),
      weak_pointer_manager_(this) {
  RegisterParamRef(kViewParamName, &view_param_);
  RegisterParamRef(kProjectionParamName, &projection_param_);
}

ObjectBase::Ref DrawContext::Create(ServiceLocator* service_locator) {
  return ObjectBase::Ref(new DrawContext(service_locator));
}

ObjectBase::Ref ParamDrawContext::Create(ServiceLocator* service_locator) {
  return ObjectBase::Ref(new ParamDrawContext(service_locator, false, false));
}
}  // namespace o3d