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// AppGL.cpp : Defines the entry point for the console application.
//

#include "stdafx.h"
#include <stdlib.h>

#define GLEW_STATIC
#include <GL/glew.h>
#include "SDL.h"
#include "SDL_opengl.h"

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int _tmain(int argc, _TCHAR* argv[])
{
	/* Vertex Shader Code */
	const GLchar* VertexShaderCode = "#version 150 \n"
		"in vec2 position;"
		"in vec3 color;"
		"out vec3 Color;"
		"void main()"
		"{"
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		"	Color = color;"
		"	gl_Position = vec4(position, 0.0, 1.0);"
		"}";

/* Fragment Shader Code */
	const GLchar* FragmentShaderCode = "#version 150 \n"
		"in vec3 Color;"
		"out vec4 outColor;"
		"void main()"
		"{"
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			"outColor = vec4(Color, 1.0);"
		"}";

/* Initializing SDL */
    SDL_Init(SDL_INIT_EVERYTHING);

SDL_Window* window = SDL_CreateWindow("OpenGL", 100, 100, 800, 600, SDL_WINDOW_OPENGL);

SDL_GLContext context = SDL_GL_CreateContext(window);

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	/* Initializin GLEW */
	glewExperimental = GL_TRUE;
	glewInit();

float vertices[] = {
		-0.5f,  0.5f, 1.0f, 0.0f, 0.0f, // Top-left
		 0.5f,  0.5f, 0.0f, 1.0f, 0.0f, // Top-right
		 0.5f, -0.5f, 0.0f, 0.0f, 1.0f, // Bottom-right
		-0.5f, -0.5f, 1.0f, 1.0f, 1.0f  // Bottom-left
	};
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GLuint elements[] =
	{
		0, 1, 2,
		2, 3, 0
	};

// Vertex Buffer Object VBO
	GLuint vbo;
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	glGenBuffers(1, &vbo); 
	glBindBuffer(GL_ARRAY_BUFFER, vbo);
	glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW);

// Elements Buffer Object EBO
	GLuint ebo;
	glGenBuffers(1, &ebo);
	glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, ebo);
	glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(elements), elements, GL_STATIC_DRAW);

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	// Vertex Array Object VAO
	GLuint vao;
	glGenVertexArrays(1, &vao);
	glBindVertexArray(vao);

/* Create and Compile Vertex Shader */
	GLuint vertexShader = glCreateShader(GL_VERTEX_SHADER);
	glShaderSource(vertexShader, 1, &VertexShaderCode, NULL);
	glCompileShader(vertexShader);

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	GLint status;
	glGetShaderiv(vertexShader, GL_COMPILE_STATUS, &status);

if(status != GL_TRUE)
		printf("Vertex Shader Compilation Failed!\n");

/* Create and Compile Fragment Shader */
	GLuint fragmentShader = glCreateShader(GL_FRAGMENT_SHADER);
	glShaderSource(fragmentShader, 1, &FragmentShaderCode, NULL);
	glCompileShader(fragmentShader);
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glGetShaderiv(fragmentShader, GL_COMPILE_STATUS, &status);

if(status != GL_TRUE)
		printf("Fragment Shader Compilation Failed!\n");

/* Create Shader Program */
	GLuint shaderProgram = glCreateProgram();
	glAttachShader(shaderProgram, vertexShader);
	glAttachShader(shaderProgram, fragmentShader);
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glBindFragDataLocation(shaderProgram, 0, "outColor");
	glLinkProgram(shaderProgram);
	glUseProgram(shaderProgram);

GLint posAttrib = glGetAttribLocation(shaderProgram, "position");
	glVertexAttribPointer(posAttrib, 2, GL_FLOAT, GL_FALSE, 5*sizeof(float), 0);
	glEnableVertexAttribArray(posAttrib);

GLint colAttrib = glGetAttribLocation(shaderProgram, "color");
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	glVertexAttribPointer(colAttrib, 3, GL_FLOAT, GL_FALSE, 5*sizeof(float), (void*)(2*sizeof(float)));
	glEnableVertexAttribArray(colAttrib);

SDL_Event windowEvent;

while (true)
	{
		if (SDL_PollEvent(&windowEvent))
		{
			if (windowEvent.type == SDL_QUIT) break;
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			if (windowEvent.type == SDL_KEYUP && windowEvent.key.keysym.sym == SDLK_ESCAPE) break;
		}

//glDrawArrays(GL_TRIANGLES, 0, 3);
		glDrawElements(GL_TRIANGLES, 6, GL_UNSIGNED_INT, elements);

SDL_GL_SwapWindow(window);
	}

/* Clear Everything */
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	glDeleteProgram(shaderProgram);
    glDeleteShader(fragmentShader);
    glDeleteShader(vertexShader);

//glDeleteBuffers(1, &ebo);
    glDeleteBuffers(1, &vbo);

glDeleteVertexArrays(1, &vao);

SDL_GL_DeleteContext(context);
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SDL_Quit();

return 0;
}
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