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82 lines
2.8 KiB
C++
82 lines
2.8 KiB
C++
/*==============================================================================
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Program: Visualization Toolkit
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Module: vtkOpenGLLabeledContourMapper.cxx
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Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
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All rights reserved.
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See Copyright.txt or http://www.kitware.com/Copyright.htm for details.
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This software is distributed WITHOUT ANY WARRANTY; without even
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the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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PURPOSE. See the above copyright notice for more information.
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==============================================================================*/
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#include "vtkOpenGLLabeledContourMapper.h"
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#include "vtkObjectFactory.h"
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#include "vtkOpenGL.h"
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#include "vtkOpenGLError.h"
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//------------------------------------------------------------------------------
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vtkStandardNewMacro(vtkOpenGLLabeledContourMapper)
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//------------------------------------------------------------------------------
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vtkOpenGLLabeledContourMapper::vtkOpenGLLabeledContourMapper()
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{
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}
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//------------------------------------------------------------------------------
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vtkOpenGLLabeledContourMapper::~vtkOpenGLLabeledContourMapper()
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{
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}
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//------------------------------------------------------------------------------
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bool vtkOpenGLLabeledContourMapper::ApplyStencil(vtkRenderer *ren,
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vtkActor *act)
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{
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// Save some state:
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GLboolean colorMask[4];
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glGetBooleanv(GL_COLOR_WRITEMASK, colorMask);
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GLboolean depthMask;
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glGetBooleanv(GL_DEPTH_WRITEMASK, &depthMask);
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// Enable rendering into the stencil buffer:
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glEnable(GL_STENCIL_TEST);
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glStencilMask(0xFF);
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glClearStencil(0);
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glClear(GL_STENCIL_BUFFER_BIT);
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glColorMask(GL_FALSE, GL_FALSE, GL_FALSE, GL_FALSE);
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glDepthMask(GL_FALSE);
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glStencilFunc(GL_ALWAYS, 1, 0xFF);
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glStencilOp(GL_REPLACE, GL_REPLACE, GL_REPLACE);
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// Draw stencil quads into stencil buffer:
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glColor4ub(255, 255, 255, 255);
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glEnableClientState(GL_VERTEX_ARRAY);
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glVertexPointer(3, GL_FLOAT, 0, this->StencilQuads);
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glDrawElements(GL_TRIANGLES, this->StencilQuadIndicesSize, GL_UNSIGNED_INT,
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this->StencilQuadIndices);
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// Restore state:
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glColorMask(colorMask[0], colorMask[1], colorMask[2], colorMask[3]);
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glDepthMask(depthMask);
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// Setup GL to only draw in unstenciled regions:
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glStencilMask(0x00);
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glStencilOp(GL_KEEP, GL_KEEP, GL_KEEP);
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glStencilFunc(GL_EQUAL, 0, 0xFF);
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vtkOpenGLCheckErrorMacro("failed after ApplyStencil()");
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return this->Superclass::ApplyStencil(ren, act);
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}
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//------------------------------------------------------------------------------
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bool vtkOpenGLLabeledContourMapper::RemoveStencil()
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{
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glDisable(GL_STENCIL_TEST);
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vtkOpenGLCheckErrorMacro("failed after RemoveStencil()");
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return this->Superclass::RemoveStencil();
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}
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