source: OGRE/trunk/ogrenew/RenderSystems/GL/src/nvparse/avp1.0_impl.cpp @ 692

#include "nvparse_errors.h"
#include "nvparse_externs.h"
#include <string.h>
#include <string>
#include <ctype.h>

#if defined(__APPLE__) && defined(__GNUC__)
#include <OpenGL/glu.h>
#else
#include <GL/glu.h>
#endif

#include <OgreGLPrerequisites.h>

using namespace std;

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


bool is_avp10(const char * s)
{
        return ! strncmp(s, "!!ARBvp1.0", 10);
}

bool avp10_init(char * s)
{
        static bool avpinit = false;
        if (avpinit == false )
        {
      /*
                if(! glh_init_extensions("GL_ARB_vertex_program"))
                {
                        errors.set("unable to initialize GL_ARB_vertex_program");
                        return false;
                }
                else
                {
        */
                        avpinit = true;
            /*
                }
        */
        }
        
        errors.reset();
        line_number = 1;
        myin = s;

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

int avp10_parse()
{
    LoadProgram( GL_VERTEX_PROGRAM_ARB, 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);

        glBindProgramARB(target, id);
        errCode = glGetError();
        if (errCode == GL_INVALID_OPERATION)
                errString = gluErrorString(errCode);

        glProgramStringARB(target, 
                           GL_PROGRAM_FORMAT_ASCII_ARB, 
                           len,
                           instring);

                if ((errCode = glGetError()) != GL_NO_ERROR)
                {
                        errString = gluErrorString(errCode);
                        
                        glGetIntegerv(GL_PROGRAM_ERROR_POSITION_ARB, &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);
                        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]);
        }
        
}