vtkOpenGLRenderUtilities.h

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// SPDX-FileCopyrightText: Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
// SPDX-License-Identifier: BSD-3-Clause
 
#ifndef vtkOpenGLRenderUtilities_h
#define vtkOpenGLRenderUtilities_h
 
#include "vtkObject.h"
#include "vtkRenderingOpenGL2Module.h" // For export macro
 
#include "vtk_glad.h" // Needed for GLuint.
#include <string>     // for std::string
 
VTK_ABI_NAMESPACE_BEGIN
class vtkOpenGLBufferObject;
class vtkOpenGLFramebufferObject;
class vtkOpenGLRenderWindow;
class vtkOpenGLState;
class vtkOpenGLVertexArrayObject;
class vtkRenderState;
class vtkShaderProgram;
class vtkTextureObject;
 
class VTKRENDERINGOPENGL2_EXPORT vtkOpenGLRenderUtilities : public vtkObject
{
public:
  vtkTypeMacro(vtkOpenGLRenderUtilities, vtkObject);
  void PrintSelf(ostream& os, vtkIndent indent) override;


  static void RenderQuad(
    float* verts, float* tcoords, vtkShaderProgram* program, vtkOpenGLVertexArrayObject* vao);
  static void RenderTriangles(float* verts, unsigned int numVerts, GLuint* iboData,
    unsigned int numIndices, float* tcoords, vtkShaderProgram* program,
    vtkOpenGLVertexArrayObject* vao);

  static bool CompositeColorTexture(vtkOpenGLState* state, const vtkRenderState* renderState,
    vtkOpenGLRenderWindow* renderWindow, vtkOpenGLFramebufferObject* readFramebuffer,
    vtkTextureObject* colorTexture, int dstXmin, int dstYmin, int width, int height);


  static std::string GetFullScreenQuadVertexShader();
  static std::string GetFullScreenQuadFragmentShaderTemplate();
  static std::string GetFullScreenQuadGeometryShader();
  static bool PrepFullScreenVAO(
    vtkOpenGLRenderWindow* renWin, vtkOpenGLVertexArrayObject* vao, vtkShaderProgram* prog);
  static void DrawFullScreenQuad();
 
  // older signsature, we suggest you use the newer signature above
  static bool PrepFullScreenVAO(
    vtkOpenGLBufferObject* vertBuf, vtkOpenGLVertexArrayObject* vao, vtkShaderProgram* prog);

  static void MarkDebugEvent(const std::string& event);
 
protected:
  vtkOpenGLRenderUtilities();
  ~vtkOpenGLRenderUtilities() override;
 
private:
  vtkOpenGLRenderUtilities(const vtkOpenGLRenderUtilities&) = delete;
  void operator=(const vtkOpenGLRenderUtilities&) = delete;
};
 
VTK_ABI_NAMESPACE_END
#endif