shaders in opengl

[Harsha200]

exception is coming in shaders.cpp

#include <iostream>

#include <fstream>

#include <string>

#include <GL/glew.h>

#include <GL/glut.h>





using namespace std;



// This is a basic program to initiate a shader

// The textFileRead function reads in a filename into a string

// programerrors and shadererrors output compilation errors

// initshaders initiates a vertex or fragment shader

// initprogram initiates a program with vertex and fragment shaders



string textFileRead(const char * filename) {

string str, ret = "";

ifstream in;

in.open(filename);

if (in.is_open()) {

getline(in, str);

while (in) {

ret += str + "\n";

getline(in, str);

}

// cout << "Shader below\n" << ret << "\n" ;

return ret;

}

else {

cerr << "Unable to Open File " << filename << "\n";

throw 2;

}

}



void programerrors(const GLint program) {

GLint length;

GLchar * log;

glGetProgramiv(program, GL_INFO_LOG_LENGTH, &length);

log = new GLchar[length + 1];

glGetProgramInfoLog(program, length, &length, log);

cout << "Compile Error, Log Below\n" << log << "\n";

delete[] log;

}

void shadererrors(const GLint shader) {

GLint length;

GLchar * log;

glGetShaderiv(shader, GL_INFO_LOG_LENGTH, &length);

log = new GLchar[length + 1];

glGetShaderInfoLog(shader, length, &length, log);

cout << "Compile Error, Log Below\n" << log << "\n";

delete[] log;

}



GLuint initshaders(GLenum type, const char *filename)

{

// Using GLSL shaders, OpenGL book, page 679



GLuint shader = glCreateShader(type);

GLint compiled;

string str = textFileRead(filename);

GLchar * cstr = new GLchar[str.size() + 1];

const GLchar * cstr2 = cstr; // Weirdness to get a const char

strcpy(cstr, str.c_str());

glShaderSource(shader, 1, &cstr2, NULL);

glCompileShader(shader);

glGetShaderiv(shader, GL_COMPILE_STATUS, &compiled);

if (!compiled) {

shadererrors(shader);

throw 3;

}

return shader;

}



GLuint initprogram(GLuint vertexshader, GLuint fragmentshader)

{

GLuint program = glCreateProgram();

GLint linked;

glAttachShader(program, vertexshader);

glAttachShader(program, fragmentshader);

glLinkProgram(program);

glGetProgramiv(program, GL_LINK_STATUS, &linked);

if (linked) glUseProgram(program);

else {

programerrors(program);

throw 4;

}

return program;

}

The fragment shader uses varying color, but previous shader does not write to it.
Out of resource error.

exception is coming on return program instruction

[Ganado]

exception is coming on return program instruction

A return statement in itself does not throw an exception. You should be more specific in which exception is being thrown, and what line it's being thrown from.

Is it possible for you to provide your shader files and make a complete, compilable source code? Paste in pastebin.com if it's too big for the forum.