J:/Caro/C++_Coding/HierarchicalEdgeBundle/HierarchicalEdgeBundle/header/AbstractShader.h

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#pragma once
#include <glew.h>
#include <windows.h>
#include <stdlib.h>
#include <io.h>
#include <stdio.h>



class AbstractShader
{
public:
        char* textFileRead(char *fn) 
        {
                FILE *fp;
                char *content = NULL;
                int count=0;

                if (fn != NULL) 
                {
                        fopen_s(&fp, fn,"rb");
                        if (fp != NULL) 
                        {
                                fseek(fp, 0, SEEK_END);
                                count = ftell(fp);
                                rewind(fp);

                                if (count > 0) 
                                {
                                        content = (char *)malloc(sizeof(char) * (count+1));
                                        count = fread(content,sizeof(char),count,fp);
                                        content[count] = '\0';
                                }
                                fclose(fp);
                        }
                }
                return content;
        };

        GLhandleARB loadShader(const char* filename, unsigned int type)
        {
                FILE *pfile;
                GLhandleARB handle;
                const GLcharARB* files[1];
                GLint result;                   
                GLint errorLoglength ;
                char* errorLogText;
                GLsizei actualErrorLogLength;
                char buffer[400000];
                memset(buffer,0,400000);
        
                //pfile = fopen(filename, "rb");
                fopen_s(&pfile, filename,"rb");
                if(!pfile)
                {
                        printf("Shader konnte nicht geöffnet werden '%s'.\n", filename);
                        //exit(0);
                }
        
                fread(buffer,sizeof(char),400000,pfile);
                fclose(pfile);
        
                handle = glCreateShaderObjectARB(type);
                if (!handle)
                {
                        printf("Shader konte nicht erstellt werden: %s.",filename);
                        //exit(0);
                }

                files[0] = (const GLcharARB*)buffer;
                glShaderSourceARB(handle, 1, files, NULL);      
                glCompileShaderARB(handle);
                glGetObjectParameterivARB(handle, GL_OBJECT_COMPILE_STATUS_ARB, &result);
        
                if (!result)
                {
                        printf("Shader '%s' konnte nicht kompeliert werden.\n",filename);
                        glGetObjectParameterivARB(handle, GL_OBJECT_INFO_LOG_LENGTH_ARB, &errorLoglength);
                        errorLogText = (char*) malloc(sizeof(char) *errorLoglength);
                        glGetInfoLogARB(handle, errorLoglength, &actualErrorLogLength, errorLogText);
                        printf("%s\n",errorLogText);
                        free(errorLogText);
                }
                return handle;
        };
};