vtkDepthPeelingPass.h

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// SPDX-FileCopyrightText: Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
// SPDX-License-Identifier: BSD-3-Clause
#ifndef vtkDepthPeelingPass_h
#define vtkDepthPeelingPass_h
 
#include "vtkOpenGLRenderPass.h"
#include "vtkRenderingOpenGL2Module.h" // For export macro
#include <vector>                      // STL Header
 
VTK_ABI_NAMESPACE_BEGIN
class vtkOpenGLFramebufferObject;
class vtkTextureObject;
class vtkOpenGLRenderWindow;
class vtkOpenGLState;
class vtkOpenGLQuadHelper;
 
class VTKRENDERINGOPENGL2_EXPORT vtkDepthPeelingPass : public vtkOpenGLRenderPass
{
public:
  static vtkDepthPeelingPass* New();
  vtkTypeMacro(vtkDepthPeelingPass, vtkOpenGLRenderPass);
  void PrintSelf(ostream& os, vtkIndent indent) override;
 
  void Render(const vtkRenderState* s) override;
 
  void ReleaseGraphicsResources(vtkWindow* w) override;
 
 
  vtkGetObjectMacro(TranslucentPass, vtkRenderPass);
  virtual void SetTranslucentPass(vtkRenderPass* translucentPass);
 
 
  vtkSetClampMacro(OcclusionRatio, double, 0.0, 0.5);
  vtkGetMacro(OcclusionRatio, double);
 
 
  vtkSetMacro(MaximumNumberOfPeels, int);
  vtkGetMacro(MaximumNumberOfPeels, int);
 
  // vtkOpenGLRenderPass virtuals:
  bool PostReplaceShaderValues(std::string& vertexShader, std::string& geometryShader,
    std::string& fragmentShader, vtkAbstractMapper* mapper, vtkProp* prop) override;
  bool SetShaderParameters(vtkShaderProgram* program, vtkAbstractMapper* mapper, vtkProp* prop,
    vtkOpenGLVertexArrayObject* VAO = nullptr) override;
 
  // Set Opaque Z texture, this must be set from the outer FO
  void SetOpaqueZTexture(vtkTextureObject*);
 
  // Set Opaque RGBA texture, this must be set from the outer FO
  void SetOpaqueRGBATexture(vtkTextureObject*);
 
  vtkSetMacro(DepthFormat, int);
 
protected:
  vtkDepthPeelingPass();
 
  ~vtkDepthPeelingPass() override;
 
  vtkRenderPass* TranslucentPass;
  vtkTimeStamp CheckTime;
 
 
  int ViewportX;
  int ViewportY;
  int ViewportWidth;
  int ViewportHeight;
 
  double OcclusionRatio;
 
  int MaximumNumberOfPeels;
 
  vtkOpenGLFramebufferObject* Framebuffer;
 
  vtkOpenGLQuadHelper* FinalBlend;
  vtkOpenGLQuadHelper* IntermediateBlend;
 
  // obtained from the outer FO, we read from them
  vtkTextureObject* OpaqueZTexture;
  vtkTextureObject* OpaqueRGBATexture;
  bool OwnOpaqueZTexture;
  bool OwnOpaqueRGBATexture;
 
  // each peel merges two color buffers into one result
  vtkTextureObject* TranslucentRGBATexture[3];
  int ColorDrawCount;
  int PeelCount;
 
  // each peel compares a prior Z and writes to next
  vtkTextureObject* TranslucentZTexture[2];
  int DepthFormat;
 
  void BlendIntermediatePeels(vtkOpenGLRenderWindow* renWin, bool);
  void BlendFinalPeel(vtkOpenGLRenderWindow* renWin);
 
  // useful to store
  vtkOpenGLState* State;
 
private:
  vtkDepthPeelingPass(const vtkDepthPeelingPass&) = delete;
  void operator=(const vtkDepthPeelingPass&) = delete;
};
 
VTK_ABI_NAMESPACE_END
#endif