source: downloads/RenderSystems/GL/src/nvparse/vp1.0_impl.cpp @ 6

#include "nvparse_errors.h"
#include "nvparse_externs.h"
#include <string.h>
#include <string>
#include <ctype.h>
#include <OgreGLPrerequisites.h>
#if OGRE_PLATFORM == OGRE_PLATFORM_APPLE
#       include <OpenGL/glu.h>
#else
#       include <GL/glu.h>
#endif

using namespace std;


namespace
{
        void LoadProgram( GLenum target, GLuint id, char *instring );
        void StrToUpper(char * string);
        int vpid;
}


bool is_vp10(const char * s)
{
        return ! strncmp(s, "!!VP1.0", 7);
}

bool vp10_init(char * s)
{
        static bool vpinit = false;
        if (vpinit == false )
        {
      /*
                if(! glh_init_extensions("GL_NV_vertex_program"))
                {
                        errors.set("unable to initialize GL_NV_vertex_program");
                        return false;
                }
                else
                {
        */
                        vpinit = true;
            /*
                }
        */
        }
        
        errors.reset();
        line_number = 1;
        myin = s;

    glGetIntegerv( GL_VERTEX_PROGRAM_BINDING_NV, &vpid );
        
    if ( vpid == 0 )
    {
        char str[128];
        sprintf( str, "No vertex program id bound for nvparse() invocation.  Bound id = %d\n", vpid );
        errors.set( str );
                return false;
    }
        
        return true;    
}

int vp10_parse()
{
    LoadProgram( GL_VERTEX_PROGRAM_NV, vpid, myin );
        return 0;
}

namespace
{
        //.----------------------------------------------------------------------------.
        //|   Function   : LoadProgram                                                 |
        //|   Description: Load a program into GL, and report any errors encountered.  |
        //.----------------------------------------------------------------------------.
        void LoadProgram( GLenum target, GLuint id, char *instring )
        {
                GLint  errPos;
                GLenum errCode;
                const GLubyte *errString;
                
                int len = strlen(instring);
                glLoadProgramNV( target, id, len, (const GLubyte *) instring );
                if ( (errCode = glGetError()) != GL_NO_ERROR )
                {
                        errString = gluErrorString( errCode );
                        
                        glGetIntegerv( GL_PROGRAM_ERROR_POSITION_NV, &errPos );
            if (errPos == -1)
                return;
                        
                        int nlines = 1;
                        int nchar  = 1;
                        int i;
                        for ( i = 0; i < errPos; i++ )
                        {
                                if ( instring[i] == '\n' )
                                {
                                        nlines++;
                                        nchar = 1;
                                }
                                else
                                {
                                        nchar++;
                                }
                        }
                        int start;
                        int end;
                        int flag = ((instring[errPos]==';') | (instring[errPos-1]==';')) ? 1 : 0;
                        for ( i = errPos; i >= 0; i-- )
                        {
                                start = i;
                                if ( flag && (start >= errPos-1)  )
                                        continue;
                                if ( instring[i] == ';' )
                                {
                                        if ( !flag )
                                        {
                                                start = i+1;
                                                if ( instring[start] == '\n' )
                                                        start++;
                                        }
                                        break;
                                }
                        }
                        for ( i = errPos; i < len; i++ )
                        {
                                end = i;
                                if ( instring[i] == ';' && end > start)
                                {
                                        break;
                                }
                        }
                        if ( errPos - start > 30 )
                        {
                                start = errPos - 30;
                        }
                        if ( end - errPos > 30 )
                        {
                                end = errPos + 30;
                        }
                        
                        char substring[96];
                        memset( substring, 0, 96 );
                        strncpy( substring, &(instring[start]), end-start+1 );
                        char str[256];
                        //sprintf( str, "error at line %d character %d\n    \"%s\"\n", nlines, nchar, substring );
                        sprintf( str, "error at line %d character %d\n\"%s\"\n", nlines, nchar, substring );
                        int width = errPos-start;
                        for ( i = 0; i < width; i++ )
                        {
                                strcat( str, " " );
                        }
                        strcat( str, "|\n" );
                        for ( i = 0; i < width; i++ )
                        {
                                strcat( str, " " );
                        }
                        strcat( str, "^\n" );
                        
                        errors.set( str );
                }
        }
        
        
        //.----------------------------------------------------------------------------.
        //|   Function   : StrToUpper                                                  |
        //|   Description: Converts all lowercase chars in a string to uppercase.      |
        //.----------------------------------------------------------------------------.
        void StrToUpper(char *string)
        {
                for (unsigned int i = 0; i < strlen(string); i++)
                        string[i] = toupper(string[i]);
        }
        
}
/*    else if(!strncmp(instring, "!!VP1.0", 7))
    {
        if (vpinit == 0 )
        {
            if(! glh_init_extensions("GL_NV_vertex_program"))
            {
                errors.set("unable to initialize GL_NV_vertex_program");
                free(instring);
                return;
            }
            else
            {
                vpinit = 1;
            }
        }
        
        errors.reset();
        line_number = 1;
        
        int vpid;
        glGetIntegerv( GL_VERTEX_PROGRAM_BINDING_NV, &vpid );
        
        if ( glGetError() != GL_NO_ERROR )
        {
            errors.set( "Previous GL_ERROR prior to vertex program parsing.\n" );
        }
        
        if ( vpid == 0 )
        {
            char str[128];
            sprintf( str, "No vertex program id bound for nvparse() invocation.  Bound id = %d\n", vpid );
            errors.set( str );
        }
        else
        {
            LoadProgram( GL_VERTEX_PROGRAM_NV, vpid, instring );
        }
    }
  */