main.cpp

#include <iostream>
#include <cmath>

#if defined(WIN32)
#define NOMINMAX
#include <windows.h>
#include <GL/gl.h>
#include <gl/GLU.h>
#elif defined(__APPLE__)
#include <OpenGL/OpenGL.h>
#include <OpenGL/glu.h>
#else
#define GL_GLEXT_PROTOTYPES
#include <GL/gl.h>
#include <GL/glu.h>
#endif

// MinVR header
#include <api/MinVR.h>
using namespace MinVR;



/** MyVRApp changes the clear color as frames progress. */
class MyVRApp : public VRApp {
public:
	MyVRApp(int argc, char** argv, const std::string& configFile) : VRApp(argc, argv, configFile) {}

	void onVREvent(const VREvent &event) {
        
        event.print();
		
        // Get the time since application began
		if (event.getName() == "FrameStart") {
            time = event.getDataAsDouble("ElapsedSeconds");
			return;
		}

		// Quit if the escape button is pressed
		if (event.getName() == "KbdEsc_Down") {
			shutdown();
		}
	}

	void onVRRenderGraphicsContext(const VRGraphicsState &renderState) {
		// Print out when the window was opened and closed
		if (renderState.isInitialRenderCall()) {
			std::cout << "Window opened." << std::endl;

			// Create VBOs, VAOs, Textures, Shaders, and FrameBuffers
		}

		if (!isRunning()) {
			std::cout << "Window closed." << std::endl;
		}
	}

	void onVRRenderGraphics(const VRGraphicsState &renderState) {
		// Get projection an view matrices
		const float* projectionMatrix = renderState.getProjectionMatrix();
		const float* viewMatrix = renderState.getViewMatrix();

		// Show gradient of red color over four seconds then restart
		float red = std::fmod(time/4.0,1.0);
		glClearColor(red, 0, 0, 1);
		glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);

		// Draw calls here
	}

private:
	double time;
};

int main(int argc, char **argv) {
	if (argc < 2) {
		std::cout << "Please enter a MinVR config file..." << std::endl;
		std::cout << "Example Usage: \n\tbuild/bin/MinGraphicsExample examples/MinGraphicsExample/desktop.xml" << std::endl;
		return 1;
	}

	// The second argument is the config file path for this example
	MyVRApp app(argc, argv, argv[1]);
	app.run();
	return 0;
}