Helper files getting into OpenGL and Cinder

HelloBatch.cpp

#include "cinder/app/App.h"
#include "cinder/app/RendererGl.h"
#include "cinder/gl/gl.h"

using namespace ci;
using namespace ci::app;
using namespace std;

class HelloTriangleApp : public App {
  public:
	void setup() override;
	void mouseDown( MouseEvent event ) override;
	void update() override;
	void draw() override;

	gl::BatchRef	mCube;
	ci::CameraPersp mCam;
	ci::mat4		mModelMatrix;
};

void HelloTriangleApp::setup()
{
	mCube = gl::Batch::create( geom::Cube(), gl::getStockShader( gl::ShaderDef().color().lambert() ) );
	mCam.setPerspective( 60.0f, getWindowAspectRatio(), .01, 10000.0f );
	mCam.lookAt( ci::vec3( 0, 0,  5 ), ci::vec3( 0 ) );
}

void HelloTriangleApp::mouseDown( MouseEvent event )
{
}

void HelloTriangleApp::update()
{
	static float rotation = 0.0;

	mModelMatrix = glm::rotate( rotation += 0.01, vec3( 0, 1, 0 ) );
}

void HelloTriangleApp::draw()
{
	gl::clear( Color( 0, 0, 0 ) ); 

	gl::ScopedDepth depth( true );

	gl::ScopedMatrices mat;
	gl::setMatrices( mCam );
	gl::color( 1, 0, 0 );
	
	gl::ScopedModelMatrix model;
	gl::setModelMatrix( mModelMatrix );
	mCube->draw();
}

CINDER_APP( HelloTriangleApp, RendererGl )

HelloTriangle.cpp

#include "cinder/app/App.h"
#include "cinder/app/RendererGl.h"
#include "cinder/gl/gl.h"

using namespace ci;
using namespace ci::app;
using namespace std;
 
class HelloTriangleApp : public App {
  public:
	void setup() override;
	void mouseDown( MouseEvent event ) override;
	void update() override;
	void draw() override;

	gl::VboRef vbo;
	gl::VaoRef vao;
	gl::GlslProgRef glsl;
	gl::BatchRef batch;
};

void HelloTriangleApp::setup()
{
	struct Vertex {
		ci::vec3 pos, color;
	};
	std::array<Vertex, 3> vertices{
		Vertex{ vec3( 0,.5,0 ), vec3( 1,0,0 ) },
		Vertex{ vec3( -.5,-.5,0 ), vec3( 0,1,0 ) },
		Vertex{ vec3( .5,-.5,0 ), vec3( 0,0,1 ) }
	};
	
	vbo = gl::Vbo::create( GL_ARRAY_BUFFER, sizeof( Vertex ) * vertices.size(), vertices.data(), GL_STATIC_DRAW );

	vao = gl::Vao::create();
	//gl::ScopedVao vao( vao );
	const uint32_t POSITION_INDEX = 0, COLOR_INDEX = 1;
	vao->bind();
	{
		auto ptr0 = offsetof( Vertex, pos );
		auto ptr1 = offsetof( Vertex, color );

		console() << ptr0 << " " << ptr1 << " " << sizeof( Vertex ) << endl;

		//gl::ScopedBuffer vbo( vbo )
		vbo->bind();
		gl::enableVertexAttribArray( POSITION_INDEX );
		gl::vertexAttribPointer( POSITION_INDEX, 3, GL_FLOAT, GL_FALSE, sizeof( Vertex ), ( const GLvoid* ) ptr0 );
		gl::enableVertexAttribArray( COLOR_INDEX );
		gl::vertexAttribPointer( COLOR_INDEX, 3, GL_FLOAT, GL_FALSE, sizeof( Vertex ), ( const GLvoid* ) ptr1 );
	}


	std::string vs = "#version 330\n"
		"in vec3 position;\n"
		"in vec3 color;\n"
		"out vec3 vColor;\n"
		"uniform float time;"
		"void main(){\n" 
		"    gl_Position = vec4(position, 1.0);\n" 
		"    vColor = color * ((sin(time + (gl_VertexID * 100)) + 1) * .5);\n }";
	std::string fs = "#version 330\n"
		"in vec3 vColor;\n"
		"out vec4 oColor;\n"
		"void main(){ oColor = vec4(vColor,  1.0); }";

	glsl = gl::GlslProg::create( gl::GlslProg::Format().vertex( vs ).fragment( fs )
								 .attribLocation( "position", POSITION_INDEX )
								 .attribLocation( "color", COLOR_INDEX ) );
}

void HelloTriangleApp::mouseDown( MouseEvent event )
{
}

void HelloTriangleApp::update()
{
}

void HelloTriangleApp::draw()
{
	gl::clear( Color( 0, 0, 0 ) ); 

	gl::ScopedVao scopeVao( vao );
	gl::ScopedGlslProg scopeGlsl( glsl );
	glsl->uniform( "time", (float)getElapsedSeconds() );
	gl::drawArrays( GL_TRIANGLES, 0, 3 );
}

CINDER_APP( HelloTriangleApp, RendererGl )