Mali GPU User Interface Engine Application Development Guide

Tutorial on Drawing 3D Shapes...0.5f, -0.5f, -0.5f, 0.0f, 1.0f,0.5f, 0.5f, -0.5f, 1.0f, 1.0f,-0.5f, -0.5f, 0.5f, 0.0f, 0.0f, //LEFT xyz for vertices, uv for texture-0.5f, 0.5f, 0.5f, 1.0f, 0.0f,-0.5f, -0.5f, -0.5f, 0.0f, 1.0f,-0.5f, 0.5f, 0.5f, 1.0f, 0.0f,-0.5f, -0.5f, -0.5f, 0.0f, 1.0f,-0.5f, 0.5f, -0.5f, 1.0f, 1.0f,0.5f, -0.5f, -0.5f, 0.0f, 0.0f, //RIGHT xyz for vertices, uv for texture0.5f, 0.5f, -0.5f, 1.0f, 0.0f,0.5f, -0.5f, 0.5f, 0.0f, 1.0f,0.5f, 0.5f, -0.5f, 1.0f, 0.0f,0.5f, -0.5f, 0.5f, 0.0f, 1.0f,0.5f, 0.5f, 0.5f, 1.0f, 1.0f,-0.5f, 0.5f, 0.5f, 0.0f, 0.0f, //TOP xyz for vertices, uv for texture0.5f, 0.5f, 0.5f, 1.0f, 0.0f,-0.5f, 0.5f, -0.5f, 0.0f, 1.0f,0.5f, 0.5f, 0.5f, 1.0f, 0.0f,-0.5f, 0.5f, -0.5f, 0.0f, 1.0f,0.5f, 0.5f, -0.5f, 1.0f, 1.0f,-0.5f, -0.5f, 0.5f, 0.0f, 0.0f, //BOTTOM xyz for vertices, uv for texture-0.5f, -0.5f, -0.5f, 1.0f, 0.0f,0.5f, -0.5f, 0.5f, 0.0f, 1.0f,-0.5f, -0.5f, 0.5f, 0.0f, 0.0f,-0.5f, -0.5f, -0.5f, 1.0f, 0.0f,0.5f, -0.5f, -0.5f, 1.0f, 1.0f,}2. Example 4-14 shows how to change the draw loop use GL_TRIANGLES instead ofGL_TRIANGLE_STRIPS:Example 4-14 Drawing GL_TRIANGLES......glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);context->drawArrays(GL_TRIANGLES, 0, 12); // draw each triangle}while ( context->update() );3. Rebuild the project and run it.4.3.2 Drawing individual triangles from the cube shapeTo emphasize that the graphic consists of many separate 2D surfaces, remove some of the faces:1. Delete every other triangle as shown in Example 4-15:Example 4-15 Deleting triangles from the vertexData array...GLfloat vertexData[] = {-0.5f, -0.5f, 0.5f, 0.0f, 0.0f, //FRONT xyz for vertices, uv for texture0.5f, -0.5f, 0.5f, 1.0f, 0.0f,-0.5f, 0.5f, 0.5f, 0.0f, 1.0f,// 0.5f, -0.5f, 0.5f, 1.0f, 0.0f, // second triangle for front face// -0.5f, 0.5f, 0.5f, 0.0f, 1.0f,// 0.5f, 0.5f, 0.5f, 1.0f, 1.0f,ARM DUI 0527A-02a Copyright © 2010 ARM. All rights reserved. 4-12ID070710Non-Confidential - Draft - Beta