gl_framework.cpp

#include "gl_framework.hpp"

namespace csX75
{
	int win_width;
	int win_height;

  	//! Initialize GL State
	void initGL(void)
	{
    	//Set framebuffer clear color
		glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
    	//Set depth buffer furthest depth
		glClearDepth(1.0);
	}

  	//!GLFW Error Callback
	void error_callback(int error, const char* description)
	{
		std::cerr<<description<<std::endl;
	}

  	//!GLFW framebuffer resize callback
	void framebuffer_size_callback(GLFWwindow* window, int width, int height)
	{

		if  ( height == 0 ) height = 1;

		glMatrixMode( GL_MODELVIEW );
		glLoadIdentity();
    	//Draw to the whole window
		glViewport( 0, 0, width, height );

    	//Keep the aspect ratio fixed
		double aspect;
		if (width > height)
		{
			aspect = (double)width/(double)height;
      	//glOrtho(-aspect, aspect, -1.0, 1.0, -1.0, 1.0);
		}
		else
		{
			aspect = (double)height/(double)width;
      	//glOrtho(-1.0, 1.0, -aspect, aspect, -1.0, 1.0);
		}

		win_width = width;
		win_height = height;
	}

  	//!GLFW keyboard callback
	void key_callback(GLFWwindow* window, int key, int scancode, int action, int mods)
	{
    	//!Close the window if the ESC key was pressed
		if (key == GLFW_KEY_ESCAPE && action == GLFW_PRESS)
			glfwSetWindowShouldClose(window, GL_TRUE);
	}
};