166                 // Here we create and compile the vertex shader. This will compile to code for your specific
167                 // graphics card.
168                 var vertexShader = compileShader(gl, vertexShaderSource, gl.VERTEX_SHADER);
169 
170                 // And then compile the fragment shader too.
171                 var fragmentShader = compileShader(gl, fragmentShaderSource, gl.FRAGMENT_SHADER);
172 
173                 // As you might expect, we are going to run some code, so we need a program.
174                 var program = createProgram(gl, vertexShader, fragmentShader);
175 
176                 // Make this the currently active program
177                 gl.useProgram(program);
178 
179                 // This is a handle to what will be a buffer
180                 var vertexBuffer = createBuffer(vertices);
181 
182                 // Bind the buffer to the positon attribute
183                 bindBuffer(vertexBuffer, 'position', 3, gl.FLOAT, 28, 0);
184 
185                 // And to the color attribute
186                 bindBuffer(vertexBuffer, 'color', 4, gl.FLOAT, 28, 12);
187 
188                 // Finally run the program. Render, or draw, the data. Here we tell it to draw triangles starting
189                 // with element zero of the vertexBuffer, and that there are three vertices. So there is
190                 // one triangle.
191                 gl.drawArrays(gl.TRIANGLES, 0, 3);
192 
193 
194                 // Repeat the same process again, create another buffer with different vertices and draw them.
195                 var anotherBuffer = createBuffer(moreVertices);
196 
197                 // Bind the buffer to the positon attribute
198                 bindBuffer(anotherBuffer, 'position', 3, gl.FLOAT, 28, 0);
199 
200                 // And to the color attribute
201                 bindBuffer(anotherBuffer, 'color', 4, gl.FLOAT, 28, 12);
202 
203                 // Finally run the program. Render, or draw, the data. Here we tell it to draw triangles starting
204                 // with element zero of the buffer, and that there are three vertices. So there is
205                 // one triangle.
206                 gl.drawArrays(gl.TRIANGLES, 0, 3);