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POVbo how to draw primitivies
 

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    <p>Hi I am trying to learn OpenGl using this tutorial <a href="http://www.opengl-tutorial.org/beginners-tutorials/tutorial-2-the-first-triangle/" rel="nofollow">http://www.opengl-tutorial.org/beginners-tutorials/tutorial-2-the-first-triangle/</a> I would say that this tutorial is not good for person who start. They show a lot of code which works for 1 triangle but there is no more examples. Atm I am trying to write function which draw. Lines or Rectangles and I have problem because it is hard to hard for me. I want to wrote reusable function. But I don't understand VBO :/ I want to write function draw which will be executed from main loop. </p> <pre><code>class lines{ public: lines(){ } static void draw(GLuint ve){ float vertices[] = {-0.5f, -0.5f, 0.5f, 0.5f}; unsigned int indices[] = {0, 1}; glEnableClientState(GL_VERTEX_ARRAY); glVertexPointer(2, GL_FLOAT, 0, vertices); glDrawElements(GL_LINES, 2, GL_UNSIGNED_INT, indices); } }; // Ensure we can capture the escape key being pressed below glfwEnable( GLFW_STICKY_KEYS ); // Dark blue background glClearColor(0.0f, 0.0f, 0.4f, 0.0f); GLuint VertexArrayID; glGenVertexArrays(1, &amp;VertexArrayID); glBindVertexArray(VertexArrayID); // Create and compile our GLSL program from the shaders GLuint programID = LoadShaders( "SimpleVertexShader.vertexshader", "SimpleFragmentShader.fragmentshader" ); static const GLfloat g_vertex_buffer_data[] = { -0.8f, -1.0f,0.0f, 0.8f, -1.0f, 0.0f, -0.8f, 1.0f, 0.0f, -0.8f, 1.0f, 0.0f, 0.8f, 1.0f, 0.0f, 0.8, -1.0f, 0.0f, }; GLuint vertexbuffer; glGenBuffers(1, &amp;vertexbuffer); glBindBuffer(GL_ARRAY_BUFFER, vertexbuffer); glBufferData(GL_ARRAY_BUFFER, sizeof(g_vertex_buffer_data), g_vertex_buffer_data, GL_STATIC_DRAW); do{ // Clear the screen glClear( GL_COLOR_BUFFER_BIT ); // Use our shader glUseProgram(programID); // 1rst attribute buffer : vertices glEnableVertexAttribArray(0); glBindBuffer(GL_ARRAY_BUFFER, vertexbuffer); glVertexAttribPointer( 0, // attribute 0. No particular reason for 0, but must match the layout in the shader. 3, // size GL_FLOAT, // type GL_FALSE, // normalized? 0, // stride (void*)0 // array buffer offset ); glDrawArrays(GL_TRIANGLES, 0, 6); glDisableVertexAttribArray(0); lines::draw(vertexbuffer); // Swap buffers glfwSwapBuffers(); } // Check if the ESC key was pressed or the window was closed while( glfwGetKey( GLFW_KEY_ESC ) != GLFW_PRESS &amp;&amp; glfwGetWindowParam( GLFW_OPENED ) ); </code></pre>
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    1. USMatthew Pigram
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    1. COThere's a mixture of vertex arrays, VBOs and VAOs here. Can you be more specific about exactly what you are having trouble with?
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