vtkGLSLModLight.h

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// SPDX-FileCopyrightText: Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
// SPDX-License-Identifier: BSD-3-Clause
#ifndef vtkGLSLModLight_h
#define vtkGLSLModLight_h

#include "vtkGLSLModifierBase.h"

#include "vtkOpenGLRenderer.h"         // for ivar
#include "vtkRenderingOpenGL2Module.h" // for export macro

VTK_ABI_NAMESPACE_BEGIN
class vtkActor;
class vtkInformationObjectBaseKey;
class vtkOpenGLRenderer;
class vtkShaderProgram;

class VTKRENDERINGOPENGL2_EXPORT vtkGLSLModLight : public vtkGLSLModifierBase
{
public:
  static vtkGLSLModLight* New();
  vtkTypeMacro(vtkGLSLModLight, vtkGLSLModifierBase);
  void PrintSelf(ostream& os, vtkIndent indent) override;

  struct LightStatsBasic
  {
    int Complexity = 0;
    int Count = 0;
  };

  static LightStatsBasic GetBasicLightStats(vtkOpenGLRenderer* renderer, vtkActor* actor);

  vtkSetMacro(UsePBRTextures, bool);
  vtkGetMacro(UsePBRTextures, bool);

  vtkSetMacro(UseAnisotropy, bool);
  vtkGetMacro(UseAnisotropy, bool);

  vtkSetMacro(UseClearCoat, bool);
  vtkGetMacro(UseClearCoat, bool);

  // vtkGLSLModifierBase virtuals:
  bool ReplaceShaderValues(vtkOpenGLRenderer* renderer, std::string& vertexShader,
    std::string& tessControlShader, std::string& tessEvalShader, std::string& geometryShader,
    std::string& fragmentShader, vtkAbstractMapper* mapper, vtkActor* actor) override;
  bool SetShaderParameters(vtkOpenGLRenderer* renderer, vtkShaderProgram* program,
    vtkAbstractMapper* mapper, vtkActor* actor, vtkOpenGLVertexArrayObject* VAO = nullptr) override;
  bool IsUpToDate(vtkOpenGLRenderer* renderer, vtkAbstractMapper* mapper, vtkActor* actor) override;

protected:
  vtkGLSLModLight();
  ~vtkGLSLModLight() override;

  int LastLightComplexity = 0;
  int LastLightCount = 0;

  bool UsePBRTextures = false;
  bool UseAnisotropy = false;
  bool UseClearCoat = false;

  vtkShaderProgram* CachedLocProgram = nullptr;
  unsigned int CachedLocLinkCount = 0;
  struct LightUniformLocations
  {
    int IntensityOpacity = -1;
    int IntensityAmbient = -1;
    int IntensityDiffuse = -1;
    int IntensitySpecular = -1;
    int ColorAmbient = -1;
    int ColorDiffuse = -1;
    int ColorSpecular = -1;
    int EnableSpecular = -1;
    int PowerSpecular = -1;
    int NormalScale = -1;
  } Loc;

private:
  vtkGLSLModLight(const vtkGLSLModLight&) = delete;
  void operator=(const vtkGLSLModLight&) = delete;
};

VTK_ABI_NAMESPACE_END
#endif