OpenGL app with GLFW and GLEW crashes - opengl

Question

The Problem:
I tried to write a class to draw me clickable rectangles the problem is that since I started using the new OpenGL version (4.0) in the program it doesn't render and gives me the runtime error error while reading on position 0x00000000.
I'll include the code of the class as well as the main loop in the bottom.
GUI::GUI(std::string name, int top, int left,int heigh, int width, bool isvisible, void(_cdecl * func)())
{
Name=name;
Top=top;
Left=left;
Heigh=heigh;
Width=width;
BackColor = struct_RGB();
glClearColor(0.0f, 0.0f, 0.4f, 1.0f);
BackDrawFunc=func;
Visibility=isvisible;
GuiObj = std::vector<GUIOBJ *>();
vertices = std::vector<float>();
vertices.clear();
for(unsigned int i=0; i<GuiObj.size(); i++)
{
GuiObj[i]->addVertices();
};
glGenVertexArrays(1, &VertexArrayID);
glBindVertexArray(VertexArrayID);
// Generate 1 buffer, put the resulting identifier in vertexbuffer
glGenBuffers(1, &VBO);
// The following commands will talk about our 'vertexbuffer' buffer
glBindBuffer(GL_ARRAY_BUFFER, VBO);
glBufferData(GL_ARRAY_BUFFER, vertices.size() * sizeof(float), vertices.data(), GL_STATIC_DRAW);
program = LoadShaders("res/VertexShader.glsl", "res/FragmentShader.glsl");
}
void GUI::Draw()
{
glClear(GL_COLOR_BUFFER_BIT);
// Use our shader
glUseProgram(program);
// 1rst attribute buffer : vertices
glBindBuffer(GL_ARRAY_BUFFER, VBO);
glEnableVertexAttribArray(0);
glVertexAttribPointer(
0, // attribute 0. No particular reason for 0, but must match the layout in the shader.
vertices.size(), // size
GL_FLOAT, // type
GL_FALSE, // normalized?
0, // stride
(void*)0 // array buffer offset
);
// Draw the triangle !
glDrawArrays(GL_TRIANGLES, 0, vertices.size()); // 3 indices starting at 0 -> 1 triangle
printf("drawing\n");
glDisableVertexAttribArray(0);
}
void main()
{
init();
//Main Loop
while(!glfwWindowShouldClose(Window))
{
if (glfwGetKey(Window, GLFW_KEY_ESCAPE) == GLFW_PRESS)
glfwSetWindowShouldClose(Window, GL_TRUE);
Test->Draw();
glfwSwapBuffers(Window);
glfwPollEvents();
}
//Termination
glfwTerminate();
}
EDIT:
I copied all the code in the same file the error is solved but it still doesn't render
#include "extincludes.h"
#include <vector>
#include <fstream>
#include <sstream>
GLFWwindow* Window;
typedef unsigned int GLuint;
GLuint VertexArrayID;
GLuint VBO;
GLuint program;
GLuint LoadShaders(const char * vertex_file_path,const char * fragment_file_path){
// Create the shaders
GLuint VertexShaderID = glCreateShader(GL_VERTEX_SHADER);
GLuint FragmentShaderID = glCreateShader(GL_FRAGMENT_SHADER);
// Read the Vertex Shader code from the file
std::string VertexShaderCode;
std::ifstream VertexShaderStream = std::ifstream(vertex_file_path, std::ios::in);
if (!VertexShaderStream.is_open()) VertexShaderStream.open(vertex_file_path, std::ios::in);
if(VertexShaderStream.is_open())
{
std::string Line = "";
while(getline(VertexShaderStream, Line))
VertexShaderCode += "\n" + Line;
VertexShaderStream.close();
} else
printf("Couldn't open VertexShader");
// Read the Fragment Shader code from the file
std::string FragmentShaderCode;
std::ifstream FragmentShaderStream(fragment_file_path, std::ios::in);
if(FragmentShaderStream.is_open()){
std::string Line = "";
while(getline(FragmentShaderStream, Line))
FragmentShaderCode += "\n" + Line;
FragmentShaderStream.close();
} else
printf("Couldn't open FragmentShader");
GLint Result = GL_FALSE;
int InfoLogLength;
// Compile Vertex Shader
printf("Compiling shader : %s\n", vertex_file_path);
char const * VertexSourcePointer = VertexShaderCode.c_str();
glShaderSource(VertexShaderID, 1, &VertexSourcePointer , NULL);
glCompileShader(VertexShaderID);
// Check Vertex Shader
glGetShaderiv(VertexShaderID, GL_COMPILE_STATUS, &Result);
glGetShaderiv(VertexShaderID, GL_INFO_LOG_LENGTH, &InfoLogLength);
std::vector<char> VertexShaderErrorMessage(InfoLogLength);
glGetShaderInfoLog(VertexShaderID, InfoLogLength, NULL, &VertexShaderErrorMessage[0]);
fprintf(stdout, "%s\n", &VertexShaderErrorMessage[0]);
// Compile Fragment Shader
printf("Compiling shader : %s\n", fragment_file_path);
char const * FragmentSourcePointer = FragmentShaderCode.c_str();
glShaderSource(FragmentShaderID, 1, &FragmentSourcePointer , NULL);
glCompileShader(FragmentShaderID);
// Check Fragment Shader
glGetShaderiv(FragmentShaderID, GL_COMPILE_STATUS, &Result);
glGetShaderiv(FragmentShaderID, GL_INFO_LOG_LENGTH, &InfoLogLength);
std::vector<char> FragmentShaderErrorMessage(InfoLogLength);
glGetShaderInfoLog(FragmentShaderID, InfoLogLength, NULL, &FragmentShaderErrorMessage[0]);
fprintf(stdout, "%s\n", &FragmentShaderErrorMessage[0]);
// Link the program
fprintf(stdout, "Linking program\n");
GLuint ProgramID = glCreateProgram();
glAttachShader(ProgramID, VertexShaderID);
glAttachShader(ProgramID, FragmentShaderID);
glLinkProgram(ProgramID);
// Check the program
glGetProgramiv(ProgramID, GL_LINK_STATUS, &Result);
glGetProgramiv(ProgramID, GL_INFO_LOG_LENGTH, &InfoLogLength);
std::vector<char> ProgramErrorMessage( glm::max(InfoLogLength, int(1)) );
glGetProgramInfoLog(ProgramID, InfoLogLength, NULL, &ProgramErrorMessage[0]);
fprintf(stdout, "%s\n", &ProgramErrorMessage[0]);
glDeleteShader(VertexShaderID);
glDeleteShader(FragmentShaderID);
return ProgramID;
}
void main()
{
//GLFW
printf("started init of GLFW \n");
if (!glfwInit())
printf("startup of GLFW errored \n");
printf("started GLFW \n");
glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 4);
glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 0);
glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE); //excluding old openGL functionality
Window = glfwCreateWindow(640, 768, "Simple example", NULL, NULL);
printf("attempt to create window \n");
if (!Window)
{
glfwTerminate();
exit(EXIT_FAILURE);
}
glfwMakeContextCurrent(Window);
printf("Init of GLFW done \n");
//GLEW
printf("start init of GLEW \n");
glewExperimental = true; // Needed for core profile
printf("using experimental version of GLEW\n");
if (glewInit() != GLEW_OK) {
printf("Failed to initialize GLEW\n");
}
printf("done with GLEW\n");
if (glfwGetCurrentContext()!=Window)
printf("context error");
glClearColor(1.0f, 0.0f, 0.0f, 1.0f);
glGenVertexArrays(1, &VertexArrayID);
glBindVertexArray(VertexArrayID);
program = LoadShaders("res/VertexShader.glsl", "res/FragmentShader.glsl");
std::vector<float> vertices = std::vector<float>();
vertices.clear();
//triangle 1
vertices.push_back(1);
vertices.push_back(1);
vertices.push_back(0);
vertices.push_back(1);
vertices.push_back(0);
vertices.push_back(3);
//triangle 2
vertices.push_back(1);
vertices.push_back(1);
vertices.push_back(0);
vertices.push_back(1);
vertices.push_back(0);
vertices.push_back(3);
// Generate 1 buffer, put the resulting identifier in vertexbuffer
glGenBuffers(1, &VBO);
// The following commands will talk about our 'vertexbuffer' buffer
glBindBuffer(GL_ARRAY_BUFFER, VBO);
glBufferData(GL_ARRAY_BUFFER, vertices.size() * sizeof(float), &vertices[0], GL_STATIC_DRAW);
glEnableVertexAttribArray(0);
glVertexAttribPointer(
0, // attribute 0. No particular reason for 0, but must match the layout in the shader.
3, // size
GL_FLOAT, // type
GL_FALSE, // normalized?
0, // stride
(void*)0 // array buffer offset
);
//Main Loop
while(!glfwWindowShouldClose(Window))
{
if (glfwGetKey(Window, GLFW_KEY_ESCAPE) == GLFW_PRESS)
glfwSetWindowShouldClose(Window, GL_TRUE);
glClear(GL_COLOR_BUFFER_BIT);
// Use our shader
glUseProgram(program);
// 1rst attribute buffer : vertices
glBindBuffer(GL_ARRAY_BUFFER, VBO);
glBindVertexArray(VertexArrayID);
// Draw the triangle !
printf("everything setup we can draw \n");
glDrawArrays(GL_TRIANGLES, 0, vertices.size()); // 3 indices starting at 0 -> 1 triangle
printf("drawing\n");
glfwSwapBuffers(Window);
glfwPollEvents();
}
//Termination
glDisableVertexAttribArray(0);
glfwDestroyWindow(Window);
glfwTerminate();
}

Answer 1

I figured the error of the crash out it was just that you need three dimensions instead of one. This led to the error that the draw function was reading out of range....