/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2006 Robert Osfield * * This library is open source and may be redistributed and/or modified under * the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or * (at your option) any later version. The full license is in LICENSE file * included with this distribution, and on the openscenegraph.org website. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * OpenSceneGraph Public License for more details. */ #ifndef OSG_TEXENVCOMBINE #define OSG_TEXENVCOMBINE 1 #include #include #include #include // If not defined by gl.h use the definition found in: // http://oss.sgi.com/projects/ogl-sample/registry/ARB/texture_env_combine.txt #ifndef GL_ARB_texture_env_combine #define GL_COMBINE_ARB 0x8570 #define GL_COMBINE_RGB_ARB 0x8571 #define GL_COMBINE_ALPHA_ARB 0x8572 #define GL_SOURCE0_RGB_ARB 0x8580 #define GL_SOURCE1_RGB_ARB 0x8581 #define GL_SOURCE2_RGB_ARB 0x8582 #define GL_SOURCE0_ALPHA_ARB 0x8588 #define GL_SOURCE1_ALPHA_ARB 0x8589 #define GL_SOURCE2_ALPHA_ARB 0x858A #define GL_OPERAND0_RGB_ARB 0x8590 #define GL_OPERAND1_RGB_ARB 0x8591 #define GL_OPERAND2_RGB_ARB 0x8592 #define GL_OPERAND0_ALPHA_ARB 0x8598 #define GL_OPERAND1_ALPHA_ARB 0x8599 #define GL_OPERAND2_ALPHA_ARB 0x859A #define GL_RGB_SCALE_ARB 0x8573 #define GL_ADD_SIGNED_ARB 0x8574 #define GL_INTERPOLATE_ARB 0x8575 #define GL_SUBTRACT_ARB 0x84E7 #define GL_CONSTANT_ARB 0x8576 #define GL_PRIMARY_COLOR_ARB 0x8577 #define GL_PREVIOUS_ARB 0x8578 #endif #ifndef GL_ARB_texture_env_dot3 #define GL_DOT3_RGB_ARB 0x86AE #define GL_DOT3_RGBA_ARB 0x86AF #endif #ifndef GL_TEXTURE0 #define GL_TEXTURE0 0x84C0 #endif namespace osg { /** TexEnvCombine encapsulates the OpenGL glTexEnvCombine (texture * environment) state. */ class OSG_EXPORT TexEnvCombine : public StateAttribute { public : TexEnvCombine(); /** Copy constructor using CopyOp to manage deep vs shallow copy. */ TexEnvCombine(const TexEnvCombine& texenv,const CopyOp& copyop=CopyOp::SHALLOW_COPY): StateAttribute(texenv,copyop), _needsTexEnvCrossbar(texenv._needsTexEnvCrossbar), _combine_RGB(texenv._combine_RGB), _combine_Alpha(texenv._combine_Alpha), _source0_RGB(texenv._source0_RGB), _source1_RGB(texenv._source1_RGB), _source2_RGB(texenv._source2_RGB), _source0_Alpha(texenv._source0_Alpha), _source1_Alpha(texenv._source1_Alpha), _source2_Alpha(texenv._source2_Alpha), _operand0_RGB(texenv._operand0_RGB), _operand1_RGB(texenv._operand1_RGB), _operand2_RGB(texenv._operand2_RGB), _operand0_Alpha(texenv._operand0_Alpha), _operand1_Alpha(texenv._operand1_Alpha), _operand2_Alpha(texenv._operand2_Alpha), _scale_RGB(texenv._scale_RGB), _scale_Alpha(texenv._scale_Alpha), _constantColor(texenv._constantColor) {} META_StateAttribute(osg, TexEnvCombine, TEXENV); virtual bool isTextureAttribute() const { return true; } /** Return -1 if *this < *rhs, 0 if *this==*rhs, 1 if *this>*rhs. */ virtual int compare(const StateAttribute& sa) const { // Check for equal types, then create the rhs variable // used by the COMPARE_StateAttribute_parameter macros below. COMPARE_StateAttribute_Types(TexEnvCombine,sa) // Compare each parameter in turn against the rhs. COMPARE_StateAttribute_Parameter(_needsTexEnvCrossbar) COMPARE_StateAttribute_Parameter(_combine_RGB) COMPARE_StateAttribute_Parameter(_combine_Alpha) COMPARE_StateAttribute_Parameter(_source0_RGB) COMPARE_StateAttribute_Parameter(_source1_RGB) COMPARE_StateAttribute_Parameter(_source2_RGB) COMPARE_StateAttribute_Parameter(_source0_Alpha) COMPARE_StateAttribute_Parameter(_source1_Alpha) COMPARE_StateAttribute_Parameter(_source2_Alpha) COMPARE_StateAttribute_Parameter(_operand0_RGB) COMPARE_StateAttribute_Parameter(_operand1_RGB) COMPARE_StateAttribute_Parameter(_operand2_RGB) COMPARE_StateAttribute_Parameter(_operand0_Alpha) COMPARE_StateAttribute_Parameter(_operand1_Alpha) COMPARE_StateAttribute_Parameter(_operand2_Alpha) COMPARE_StateAttribute_Parameter(_scale_RGB) COMPARE_StateAttribute_Parameter(_scale_Alpha) COMPARE_StateAttribute_Parameter(_constantColor) return 0; // Passed all the above comparison macros, so must be equal. } enum CombineParam { REPLACE = GL_REPLACE, MODULATE = GL_MODULATE, ADD = GL_ADD, ADD_SIGNED = GL_ADD_SIGNED_ARB, INTERPOLATE = GL_INTERPOLATE_ARB, SUBTRACT = GL_SUBTRACT_ARB, DOT3_RGB = GL_DOT3_RGB_ARB, DOT3_RGBA = GL_DOT3_RGBA_ARB }; void setCombine_RGB(GLint cm); void setCombine_Alpha(GLint cm); GLint getCombine_RGB() const { return _combine_RGB; } GLint getCombine_Alpha() const { return _combine_Alpha; } enum SourceParam { CONSTANT = GL_CONSTANT_ARB, PRIMARY_COLOR = GL_PRIMARY_COLOR_ARB, PREVIOUS = GL_PREVIOUS_ARB, TEXTURE = GL_TEXTURE, TEXTURE0 = GL_TEXTURE0, TEXTURE1 = GL_TEXTURE0+1, TEXTURE2 = GL_TEXTURE0+2, TEXTURE3 = GL_TEXTURE0+3, TEXTURE4 = GL_TEXTURE0+4, TEXTURE5 = GL_TEXTURE0+5, TEXTURE6 = GL_TEXTURE0+6, TEXTURE7 = GL_TEXTURE0+7 }; void setSource0_RGB(GLint sp); void setSource1_RGB(GLint sp); void setSource2_RGB(GLint sp); void setSource0_Alpha(GLint sp); void setSource1_Alpha(GLint sp); void setSource2_Alpha(GLint sp); GLint getSource0_RGB() const { return _source0_RGB; } GLint getSource1_RGB() const { return _source1_RGB; } GLint getSource2_RGB() const { return _source2_RGB; } GLint getSource0_Alpha() const { return _source0_Alpha; } GLint getSource1_Alpha() const { return _source1_Alpha; } GLint getSource2_Alpha() const { return _source2_Alpha; } enum OperandParam { SRC_COLOR = GL_SRC_COLOR, ONE_MINUS_SRC_COLOR = GL_ONE_MINUS_SRC_COLOR, SRC_ALPHA = GL_SRC_ALPHA, ONE_MINUS_SRC_ALPHA = GL_ONE_MINUS_SRC_ALPHA }; void setOperand0_RGB(GLint op); void setOperand1_RGB(GLint op); void setOperand2_RGB(GLint op); void setOperand0_Alpha(GLint op); void setOperand1_Alpha(GLint op); void setOperand2_Alpha(GLint op); GLint getOperand0_RGB() const { return _operand0_RGB; } GLint getOperand1_RGB() const { return _operand1_RGB; } GLint getOperand2_RGB() const { return _operand2_RGB; } GLint getOperand0_Alpha() const { return _operand0_Alpha; } GLint getOperand1_Alpha() const { return _operand1_Alpha; } GLint getOperand2_Alpha() const { return _operand2_Alpha; } void setScale_RGB(float scale); void setScale_Alpha(float scale); float getScale_RGB() const { return _scale_RGB; } float getScale_Alpha() const { return _scale_Alpha; } void setConstantColor( const Vec4& color ) { _constantColor = color; } const Vec4& getConstantColor() const { return _constantColor; } /** Set the constant color attribute to the given light direction * for use with DOT3 combine operation. */ void setConstantColorAsLightDirection(const Vec3& direction) { _constantColor.set((direction.x()+1.0f)*0.5f,(direction.y()+1.0f)*0.5f,(direction.z()+1.0f)*0.5f,1.0f); } Vec3 getConstantColorAsLightDirection() const { return Vec3(_constantColor.x()*2.0f-1.0f, _constantColor.y()*2.0f-1.0f, _constantColor.z()*2.0f-1.0f); } virtual void apply(State& state) const; protected : virtual ~TexEnvCombine(); inline bool needsTexEnvCombiner(GLint value) const { switch(value) { case(CONSTANT): case(PRIMARY_COLOR): case(PREVIOUS): case(TEXTURE): return false; } return true; } void computeNeedForTexEnvCombiners() { _needsTexEnvCrossbar = (needsTexEnvCombiner(_source0_RGB) || needsTexEnvCombiner(_source1_RGB) || needsTexEnvCombiner(_source2_RGB) || needsTexEnvCombiner(_source0_Alpha) || needsTexEnvCombiner(_source1_Alpha) || needsTexEnvCombiner(_source2_Alpha)); } bool _needsTexEnvCrossbar; GLint _combine_RGB; GLint _combine_Alpha; GLint _source0_RGB; GLint _source1_RGB; GLint _source2_RGB; GLint _source0_Alpha; GLint _source1_Alpha; GLint _source2_Alpha; GLint _operand0_RGB; GLint _operand1_RGB; GLint _operand2_RGB; GLint _operand0_Alpha; GLint _operand1_Alpha; GLint _operand2_Alpha; float _scale_RGB; float _scale_Alpha; osg::Vec4 _constantColor; }; } #endif