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/*==============================================================================
Program: Visualization Toolkit
Module: vtkOpenGLLabeledContourMapper.cxx
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.
==============================================================================*/
#include "vtkOpenGLLabeledContourMapper.h"
#include "vtkObjectFactory.h"
#include "vtkOpenGL.h"
#include "vtkOpenGLError.h"
//------------------------------------------------------------------------------
vtkStandardNewMacro(vtkOpenGLLabeledContourMapper)
//------------------------------------------------------------------------------
vtkOpenGLLabeledContourMapper::vtkOpenGLLabeledContourMapper()
{
}
//------------------------------------------------------------------------------
vtkOpenGLLabeledContourMapper::~vtkOpenGLLabeledContourMapper()
{
}
//------------------------------------------------------------------------------
bool vtkOpenGLLabeledContourMapper::ApplyStencil(vtkRenderer *ren,
vtkActor *act)
{
// Save some state:
GLboolean colorMask[4];
glGetBooleanv(GL_COLOR_WRITEMASK, colorMask);
GLboolean depthMask;
glGetBooleanv(GL_DEPTH_WRITEMASK, &depthMask);
// Enable rendering into the stencil buffer:
glEnable(GL_STENCIL_TEST);
glStencilMask(0xFF);
glClearStencil(0);
glClear(GL_STENCIL_BUFFER_BIT);
glColorMask(GL_FALSE, GL_FALSE, GL_FALSE, GL_FALSE);
glDepthMask(GL_FALSE);
glStencilFunc(GL_ALWAYS, 1, 0xFF);
glStencilOp(GL_REPLACE, GL_REPLACE, GL_REPLACE);
// Draw stencil quads into stencil buffer:
glColor4ub(255, 255, 255, 255);
glEnableClientState(GL_VERTEX_ARRAY);
glVertexPointer(3, GL_FLOAT, 0, this->StencilQuads);
glDrawElements(GL_TRIANGLES, this->StencilQuadIndicesSize, GL_UNSIGNED_INT,
this->StencilQuadIndices);
// Restore state:
glColorMask(colorMask[0], colorMask[1], colorMask[2], colorMask[3]);
glDepthMask(depthMask);
// Setup GL to only draw in unstenciled regions:
glStencilMask(0x00);
glStencilOp(GL_KEEP, GL_KEEP, GL_KEEP);
glStencilFunc(GL_EQUAL, 0, 0xFF);
vtkOpenGLCheckErrorMacro("failed after ApplyStencil()");
return this->Superclass::ApplyStencil(ren, act);
}
//------------------------------------------------------------------------------
bool vtkOpenGLLabeledContourMapper::RemoveStencil()
{
glDisable(GL_STENCIL_TEST);
vtkOpenGLCheckErrorMacro("failed after RemoveStencil()");
return this->Superclass::RemoveStencil();
}
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