/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2005 Robert Osfield 
 * Copyright (C) 2003-2005 3Dlabs Inc. Ltd.
 * Copyright (C) 2004-2005 Nathan Cournia
 *
 * This application is open source and may be redistributed and/or modified   
 * freely and without restriction, both in commericial and non commericial
 * applications, as long as this copyright notice is maintained.
 * 
 * This application 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.
*/

/* file:        include/osg/GL2Extensions
 * author:      Mike Weiblen 2005-05-05
*/

#ifndef OSG_GL2EXTENSIONS
#define OSG_GL2EXTENSIONS 1

#include <osg/Referenced>
#include <osg/GL>

#include <string>

#ifndef GL_VERSION_2_0    //[
#define GL_VERSION_2_0 1
typedef char GLchar;
#define GL_BLEND_EQUATION_RGB             GL_BLEND_EQUATION
#define GL_VERTEX_ATTRIB_ARRAY_ENABLED    0x8622
#define GL_VERTEX_ATTRIB_ARRAY_SIZE       0x8623
#define GL_VERTEX_ATTRIB_ARRAY_STRIDE     0x8624
#define GL_VERTEX_ATTRIB_ARRAY_TYPE       0x8625
#define GL_CURRENT_VERTEX_ATTRIB          0x8626
#define GL_VERTEX_PROGRAM_POINT_SIZE      0x8642
#define GL_VERTEX_PROGRAM_TWO_SIDE        0x8643
#define GL_VERTEX_ATTRIB_ARRAY_POINTER    0x8645
#define GL_STENCIL_BACK_FUNC              0x8800
#define GL_STENCIL_BACK_FAIL              0x8801
#define GL_STENCIL_BACK_PASS_DEPTH_FAIL   0x8802
#define GL_STENCIL_BACK_PASS_DEPTH_PASS   0x8803
#define GL_MAX_DRAW_BUFFERS               0x8824
#define GL_DRAW_BUFFER0                   0x8825
#define GL_DRAW_BUFFER1                   0x8826
#define GL_DRAW_BUFFER2                   0x8827
#define GL_DRAW_BUFFER3                   0x8828
#define GL_DRAW_BUFFER4                   0x8829
#define GL_DRAW_BUFFER5                   0x882A
#define GL_DRAW_BUFFER6                   0x882B
#define GL_DRAW_BUFFER7                   0x882C
#define GL_DRAW_BUFFER8                   0x882D
#define GL_DRAW_BUFFER9                   0x882E
#define GL_DRAW_BUFFER10                  0x882F
#define GL_DRAW_BUFFER11                  0x8830
#define GL_DRAW_BUFFER12                  0x8831
#define GL_DRAW_BUFFER13                  0x8832
#define GL_DRAW_BUFFER14                  0x8833
#define GL_DRAW_BUFFER15                  0x8834
#define GL_BLEND_EQUATION_ALPHA           0x883D
#define GL_POINT_SPRITE                   0x8861
#define GL_COORD_REPLACE                  0x8862
#define GL_MAX_VERTEX_ATTRIBS             0x8869
#define GL_VERTEX_ATTRIB_ARRAY_NORMALIZED 0x886A
#define GL_MAX_TEXTURE_COORDS             0x8871
#define GL_MAX_TEXTURE_IMAGE_UNITS        0x8872
#define GL_FRAGMENT_SHADER                0x8B30
#define GL_VERTEX_SHADER                  0x8B31
#define GL_MAX_FRAGMENT_UNIFORM_COMPONENTS 0x8B49
#define GL_MAX_VERTEX_UNIFORM_COMPONENTS  0x8B4A
#define GL_MAX_VARYING_FLOATS             0x8B4B
#define GL_MAX_VERTEX_TEXTURE_IMAGE_UNITS 0x8B4C
#define GL_MAX_COMBINED_TEXTURE_IMAGE_UNITS 0x8B4D
#define GL_SHADER_TYPE                    0x8B4F
#define GL_FLOAT_VEC2                     0x8B50
#define GL_FLOAT_VEC3                     0x8B51
#define GL_FLOAT_VEC4                     0x8B52
#define GL_INT_VEC2                       0x8B53
#define GL_INT_VEC3                       0x8B54
#define GL_INT_VEC4                       0x8B55
#define GL_BOOL                           0x8B56
#define GL_BOOL_VEC2                      0x8B57
#define GL_BOOL_VEC3                      0x8B58
#define GL_BOOL_VEC4                      0x8B59
#define GL_FLOAT_MAT2                     0x8B5A
#define GL_FLOAT_MAT3                     0x8B5B
#define GL_FLOAT_MAT4                     0x8B5C
#define GL_SAMPLER_1D                     0x8B5D
#define GL_SAMPLER_2D                     0x8B5E
#define GL_SAMPLER_3D                     0x8B5F
#define GL_SAMPLER_CUBE                   0x8B60
#define GL_SAMPLER_1D_SHADOW              0x8B61
#define GL_SAMPLER_2D_SHADOW              0x8B62
#define GL_DELETE_STATUS                  0x8B80
#define GL_COMPILE_STATUS                 0x8B81
#define GL_LINK_STATUS                    0x8B82
#define GL_VALIDATE_STATUS                0x8B83
#define GL_INFO_LOG_LENGTH                0x8B84
#define GL_ATTACHED_SHADERS               0x8B85
#define GL_ACTIVE_UNIFORMS                0x8B86
#define GL_ACTIVE_UNIFORM_MAX_LENGTH      0x8B87
#define GL_SHADER_SOURCE_LENGTH           0x8B88
#define GL_ACTIVE_ATTRIBUTES              0x8B89
#define GL_ACTIVE_ATTRIBUTE_MAX_LENGTH    0x8B8A
#define GL_FRAGMENT_SHADER_DERIVATIVE_HINT 0x8B8B
#define GL_SHADING_LANGUAGE_VERSION       0x8B8C
#define GL_CURRENT_PROGRAM                0x8B8D
#define GL_POINT_SPRITE_COORD_ORIGIN      0x8CA0
#define GL_LOWER_LEFT                     0x8CA1
#define GL_UPPER_LEFT                     0x8CA2
#define GL_STENCIL_BACK_REF               0x8CA3
#define GL_STENCIL_BACK_VALUE_MASK        0x8CA4
#define GL_STENCIL_BACK_WRITEMASK         0x8CA5
#endif    //]

namespace osg {

class OSG_EXPORT GL2Extensions : public osg::Referenced
{
    public:
        GL2Extensions(unsigned int contextID);
        GL2Extensions(const GL2Extensions& rhs);

        void lowestCommonDenominator(const GL2Extensions& rhs);

        void setupGL2Extensions(unsigned int contextID);

        /** Does the GL driver support OpenGL Shading Language? */
        bool isGlslSupported() const;

        float getGlVersion() const { return _glVersion; }
        float getLanguageVersion() const { return _glslLanguageVersion; }

        void setShaderObjectsSupported(bool flag) { _isShaderObjectsSupported = flag; }
        bool isShaderObjectsSupported() const { return _isShaderObjectsSupported; }

        void setVertexShaderSupported(bool flag) { _isVertexShaderSupported = flag; }
        bool isVertexShaderSupported() const { return _isVertexShaderSupported; }

        void setFragmentShaderSupported(bool flag) { _isFragmentShaderSupported = flag; }
        bool isFragmentShaderSupported() const { return _isFragmentShaderSupported; }

        void setLanguage100Supported(bool flag) { _isLanguage100Supported = flag; }
        bool isLanguage100Supported() const { return _isLanguage100Supported; }

        /** Function to call to get the extension of a specified context.
          * If the Exentsion object for that context has not yet been created then
          * and the 'createIfNotInitalized' flag been set to false then returns NULL.
          * If 'createIfNotInitalized' is true then the Extensions object is
          * automatically created.  However, in this case the extension object
          * only be created with the graphics context associated with ContextID..*/
        static GL2Extensions* Get(unsigned int contextID,bool createIfNotInitalized);

        /** allows users to override the extensions across graphics contexts.
          * typically used when you have different extensions supported across graphics pipes
          * but need to ensure that they all use the same low common denominator extensions.*/
        static void Set(unsigned int contextID, GL2Extensions* extensions);


        void glBlendEquationSeparate(GLenum modeRGB, GLenum modeAlpha) const;
        void glDrawBuffers(GLsizei n, const GLenum *bufs) const;
        void glStencilOpSeparate(GLenum face, GLenum sfail, GLenum dpfail, GLenum dppass) const;
        void glStencilFuncSeparate(GLenum frontfunc, GLenum backfunc, GLint ref, GLuint mask) const;
        void glStencilMaskSeparate(GLenum face, GLuint mask) const;
        void glAttachShader(GLuint program, GLuint shader) const;
        void glBindAttribLocation(GLuint program, GLuint index, const GLchar *name) const;
        void glCompileShader(GLuint shader) const;
        GLuint glCreateProgram(void) const;
        GLuint glCreateShader(GLenum type) const;
        void glDeleteProgram(GLuint program) const;
        void glDeleteShader(GLuint shader) const;
        void glDetachShader(GLuint program, GLuint shader) const;
        void glDisableVertexAttribArray(GLuint index) const;
        void glEnableVertexAttribArray(GLuint index) const;
        void glGetActiveAttrib(GLuint program, GLuint index, GLsizei bufSize, GLsizei *length, GLint *size, GLenum *type, GLchar *name) const;
        void glGetActiveUniform(GLuint program, GLuint index, GLsizei bufSize, GLsizei *length, GLint *size, GLenum *type, GLchar *name) const;
        void glGetAttachedShaders(GLuint program, GLsizei maxCount, GLsizei *count, GLuint *obj) const;
        GLint glGetAttribLocation(GLuint program, const GLchar *name) const;
        void glGetProgramiv(GLuint program, GLenum pname, GLint *params) const;
        void glGetProgramInfoLog(GLuint program, GLsizei bufSize, GLsizei *length, GLchar *infoLog) const;
        void glGetShaderiv(GLuint shader, GLenum pname, GLint *params) const;
        void glGetShaderInfoLog(GLuint shader, GLsizei bufSize, GLsizei *length, GLchar *infoLog) const;
        void glGetShaderSource(GLuint shader, GLsizei bufSize, GLsizei *length, GLchar *source) const;
        GLint glGetUniformLocation(GLuint program, const GLchar *name) const;
        void glGetUniformfv(GLuint program, GLint location, GLfloat *params) const;
        void glGetUniformiv(GLuint program, GLint location, GLint *params) const;
        void glGetVertexAttribdv(GLuint index, GLenum pname, GLdouble *params) const;
        void glGetVertexAttribfv(GLuint index, GLenum pname, GLfloat *params) const;
        void glGetVertexAttribiv(GLuint index, GLenum pname, GLint *params) const;
        void glGetVertexAttribPointerv(GLuint index, GLenum pname, GLvoid* *pointer) const;
        GLboolean glIsProgram(GLuint program) const;
        GLboolean glIsShader(GLuint shader) const;
        void glLinkProgram(GLuint program) const;
        void glShaderSource(GLuint shader, GLsizei count, const GLchar* *string, const GLint *length) const;
        void glUseProgram(GLuint program) const;
        void glUniform1f(GLint location, GLfloat v0) const;
        void glUniform2f(GLint location, GLfloat v0, GLfloat v1) const;
        void glUniform3f(GLint location, GLfloat v0, GLfloat v1, GLfloat v2) const;
        void glUniform4f(GLint location, GLfloat v0, GLfloat v1, GLfloat v2, GLfloat v3) const;
        void glUniform1i(GLint location, GLint v0) const;
        void glUniform2i(GLint location, GLint v0, GLint v1) const;
        void glUniform3i(GLint location, GLint v0, GLint v1, GLint v2) const;
        void glUniform4i(GLint location, GLint v0, GLint v1, GLint v2, GLint v3) const;
        void glUniform1fv(GLint location, GLsizei count, const GLfloat *value) const;
        void glUniform2fv(GLint location, GLsizei count, const GLfloat *value) const;
        void glUniform3fv(GLint location, GLsizei count, const GLfloat *value) const;
        void glUniform4fv(GLint location, GLsizei count, const GLfloat *value) const;
        void glUniform1iv(GLint location, GLsizei count, const GLint *value) const;
        void glUniform2iv(GLint location, GLsizei count, const GLint *value) const;
        void glUniform3iv(GLint location, GLsizei count, const GLint *value) const;
        void glUniform4iv(GLint location, GLsizei count, const GLint *value) const;
        void glUniformMatrix2fv(GLint location, GLsizei count, GLboolean transpose, const GLfloat *value) const;
        void glUniformMatrix3fv(GLint location, GLsizei count, GLboolean transpose, const GLfloat *value) const;
        void glUniformMatrix4fv(GLint location, GLsizei count, GLboolean transpose, const GLfloat *value) const;
        void glValidateProgram(GLuint program) const;
        void glVertexAttrib1d(GLuint index, GLdouble x) const;
        void glVertexAttrib1dv(GLuint index, const GLdouble *v) const;
        void glVertexAttrib1f(GLuint index, GLfloat x) const;
        void glVertexAttrib1fv(GLuint index, const GLfloat *v) const;
        void glVertexAttrib1s(GLuint index, GLshort x) const;
        void glVertexAttrib1sv(GLuint index, const GLshort *v) const;
        void glVertexAttrib2d(GLuint index, GLdouble x, GLdouble y) const;
        void glVertexAttrib2dv(GLuint index, const GLdouble *v) const;
        void glVertexAttrib2f(GLuint index, GLfloat x, GLfloat y) const;
        void glVertexAttrib2fv(GLuint index, const GLfloat *v) const;
        void glVertexAttrib2s(GLuint index, GLshort x, GLshort y) const;
        void glVertexAttrib2sv(GLuint index, const GLshort *v) const;
        void glVertexAttrib3d(GLuint index, GLdouble x, GLdouble y, GLdouble z) const;
        void glVertexAttrib3dv(GLuint index, const GLdouble *v) const;
        void glVertexAttrib3f(GLuint index, GLfloat x, GLfloat y, GLfloat z) const;
        void glVertexAttrib3fv(GLuint index, const GLfloat *v) const;
        void glVertexAttrib3s(GLuint index, GLshort x, GLshort y, GLshort z) const;
        void glVertexAttrib3sv(GLuint index, const GLshort *v) const;
        void glVertexAttrib4Nbv(GLuint index, const GLbyte *v) const;
        void glVertexAttrib4Niv(GLuint index, const GLint *v) const;
        void glVertexAttrib4Nsv(GLuint index, const GLshort *v) const;
        void glVertexAttrib4Nub(GLuint index, GLubyte x, GLubyte y, GLubyte z, GLubyte w) const;
        void glVertexAttrib4Nubv(GLuint index, const GLubyte *v) const;
        void glVertexAttrib4Nuiv(GLuint index, const GLuint *v) const;
        void glVertexAttrib4Nusv(GLuint index, const GLushort *v) const;
        void glVertexAttrib4bv(GLuint index, const GLbyte *v) const;
        void glVertexAttrib4d(GLuint index, GLdouble x, GLdouble y, GLdouble z, GLdouble w) const;
        void glVertexAttrib4dv(GLuint index, const GLdouble *v) const;
        void glVertexAttrib4f(GLuint index, GLfloat x, GLfloat y, GLfloat z, GLfloat w) const;
        void glVertexAttrib4fv(GLuint index, const GLfloat *v) const;
        void glVertexAttrib4iv(GLuint index, const GLint *v) const;
        void glVertexAttrib4s(GLuint index, GLshort x, GLshort y, GLshort z, GLshort w) const;
        void glVertexAttrib4sv(GLuint index, const GLshort *v) const;
        void glVertexAttrib4ubv(GLuint index, const GLubyte *v) const;
        void glVertexAttrib4uiv(GLuint index, const GLuint *v) const;
        void glVertexAttrib4usv(GLuint index, const GLushort *v) const;
        void glVertexAttribPointer(GLuint index, GLint size, GLenum type, GLboolean normalized, GLsizei stride, const GLvoid *pointer) const;

        // C++-friendly convenience wrapper methods
        GLuint getCurrentProgram() const;
        bool getProgramInfoLog( GLuint program, std::string& result ) const;
        bool getShaderInfoLog( GLuint shader, std::string& result ) const;
        bool getAttribLocation( const char* attribName, GLuint& slot ) const;

    protected:
        ~GL2Extensions() {}

        float _glVersion;
        float _glslLanguageVersion;

        bool _isShaderObjectsSupported;
        bool _isVertexShaderSupported;
        bool _isFragmentShaderSupported;
        bool _isLanguage100Supported;

        void* _glBlendEquationSeparate;
        void* _glDrawBuffers;
        void* _glStencilOpSeparate;
        void* _glStencilFuncSeparate;
        void* _glStencilMaskSeparate;
        void* _glAttachShader;
        void* _glBindAttribLocation;
        void* _glCompileShader;
        void* _glCreateProgram;
        void* _glCreateShader;
        void* _glDeleteProgram;
        void* _glDeleteShader;
        void* _glDetachShader;
        void* _glDisableVertexAttribArray;
        void* _glEnableVertexAttribArray;
        void* _glGetActiveAttrib;
        void* _glGetActiveUniform;
        void* _glGetAttachedShaders;
        void* _glGetAttribLocation;
        void* _glGetProgramiv;
        void* _glGetProgramInfoLog;
        void* _glGetShaderiv;
        void* _glGetShaderInfoLog;
        void* _glGetShaderSource;
        void* _glGetUniformLocation;
        void* _glGetUniformfv;
        void* _glGetUniformiv;
        void* _glGetVertexAttribdv;
        void* _glGetVertexAttribfv;
        void* _glGetVertexAttribiv;
        void* _glGetVertexAttribPointerv;
        void* _glIsProgram;
        void* _glIsShader;
        void* _glLinkProgram;
        void* _glShaderSource;
        void* _glUseProgram;
        void* _glUniform1f;
        void* _glUniform2f;
        void* _glUniform3f;
        void* _glUniform4f;
        void* _glUniform1i;
        void* _glUniform2i;
        void* _glUniform3i;
        void* _glUniform4i;
        void* _glUniform1fv;
        void* _glUniform2fv;
        void* _glUniform3fv;
        void* _glUniform4fv;
        void* _glUniform1iv;
        void* _glUniform2iv;
        void* _glUniform3iv;
        void* _glUniform4iv;
        void* _glUniformMatrix2fv;
        void* _glUniformMatrix3fv;
        void* _glUniformMatrix4fv;
        void* _glValidateProgram;
        void* _glVertexAttrib1d;
        void* _glVertexAttrib1dv;
        void* _glVertexAttrib1f;
        void* _glVertexAttrib1fv;
        void* _glVertexAttrib1s;
        void* _glVertexAttrib1sv;
        void* _glVertexAttrib2d;
        void* _glVertexAttrib2dv;
        void* _glVertexAttrib2f;
        void* _glVertexAttrib2fv;
        void* _glVertexAttrib2s;
        void* _glVertexAttrib2sv;
        void* _glVertexAttrib3d;
        void* _glVertexAttrib3dv;
        void* _glVertexAttrib3f;
        void* _glVertexAttrib3fv;
        void* _glVertexAttrib3s;
        void* _glVertexAttrib3sv;
        void* _glVertexAttrib4Nbv;
        void* _glVertexAttrib4Niv;
        void* _glVertexAttrib4Nsv;
        void* _glVertexAttrib4Nub;
        void* _glVertexAttrib4Nubv;
        void* _glVertexAttrib4Nuiv;
        void* _glVertexAttrib4Nusv;
        void* _glVertexAttrib4bv;
        void* _glVertexAttrib4d;
        void* _glVertexAttrib4dv;
        void* _glVertexAttrib4f;
        void* _glVertexAttrib4fv;
        void* _glVertexAttrib4iv;
        void* _glVertexAttrib4s;
        void* _glVertexAttrib4sv;
        void* _glVertexAttrib4ubv;
        void* _glVertexAttrib4uiv;
        void* _glVertexAttrib4usv;
        void* _glVertexAttribPointer;

        void* _glGetInfoLogARB;
        void* _glGetObjectParameterivARB;
        void* _glDeleteObjectARB;
        void* _glGetHandleARB;
};

}

#endif

/*EOF*/
