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/*=========================================================================
Program: Visualization Toolkit
Module: vtkOpenGLGL2PSHelper.h
Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
All rights reserved.
See Copyright.txt or http://www.kitware.com/Copyright.htm for details.
This software is distributed WITHOUT ANY WARRANTY; without even
the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE. See the above copyright notice for more information.
=========================================================================*/
// .NAME vtkOpenGLGL2PSHelper - Helper functionality for GL2PS exporting.
//
// .SECTION Description
// vtkOpenGLGL2PSHelper provides a number of static variables and methods that
// are used during GL2PS exporting. The rational behind this class is that GL
// does not include all of the information that GL2PS needs into its feedback
// buffer, and in certain situations GL2PS function calls need to be made
// alongside their GL equivalents, notably glLineWidth and glPointSize.
//
// The static variables in this class are set by vtkGL2PSUtilities at the
// beginning of a GL2PS export render. This class fakes GL2PS calls like
// gl2psLineWidth in order to keep GL2PS from being a module dependency for
// vtkRenderingOpenGL.
#ifndef vtkOpenGLGL2PSHelper_h
#define vtkOpenGLGL2PSHelper_h
#include "vtkRenderingOpenGLModule.h" // For export macro
#include "vtkOpenGL.h" // for GL defines.
class VTKRENDERINGOPENGL_EXPORT vtkOpenGLGL2PSHelper
{
public:
// Description:
// Call alongside glLineWidth(lineWidth) to inform GL2PS of the change.
static void SetLineWidth(float lineWidth)
{
if (vtkOpenGLGL2PSHelper::InGL2PSRender)
{
glPassThrough(vtkOpenGLGL2PSHelper::LineWidthToken);
glPassThrough(vtkOpenGLGL2PSHelper::LineWidthFactor * lineWidth);
}
}
// Description:
// Call alongside glPointSize(pointSize) to inform GL2PS of the change.
static void SetPointSize(float pointSize)
{
if (vtkOpenGLGL2PSHelper::InGL2PSRender)
{
glPassThrough(vtkOpenGLGL2PSHelper::PointSizeToken);
glPassThrough(vtkOpenGLGL2PSHelper::PointSizeFactor * pointSize);
}
}
// Description:
// Call alongside glEnable(GL_LINE_STIPPLE) to inform GL2PS of the change.
// This must be called *after* calling glLineStipple(factor, pattern).
static void EnableStipple()
{
if (vtkOpenGLGL2PSHelper::InGL2PSRender)
{
GLint tmp;
glPassThrough(vtkOpenGLGL2PSHelper::StippleBeginToken);
glGetIntegerv(GL_LINE_STIPPLE_PATTERN, &tmp);
glPassThrough(static_cast<GLfloat>(tmp));
glGetIntegerv(GL_LINE_STIPPLE_REPEAT, &tmp);
glPassThrough(static_cast<GLfloat>(tmp));
}
}
// Description:
// Call alongside glDisable(GL_LINE_STIPPLE) to inform GL2PS of the change.
static void DisableStipple()
{
if (vtkOpenGLGL2PSHelper::InGL2PSRender)
{
glPassThrough(vtkOpenGLGL2PSHelper::StippleEndToken);
}
}
protected:
friend class vtkGL2PSUtilities;
static bool InGL2PSRender;
static GLfloat PointSizeFactor;
static GLfloat LineWidthFactor;
static GLfloat PointSizeToken;
static GLfloat LineWidthToken;
static GLfloat StippleBeginToken;
static GLfloat StippleEndToken;
private:
// static-only class -- no need to construct/destroy.
vtkOpenGLGL2PSHelper();
~vtkOpenGLGL2PSHelper();
vtkOpenGLGL2PSHelper(const vtkOpenGLGL2PSHelper &); // Not implemented.
void operator=(const vtkOpenGLGL2PSHelper &); // Not implemented.
};
#endif //vtkOpenGLGL2PSHelper_h
// VTK-HeaderTest-Exclude: vtkOpenGLGL2PSHelper.h
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