Mali GPU User Interface Engine Application Development Guide

Tutorial on Drawing 3D Shapes4.1 Drawing a simple 3D cubeThis tutorial describes a constructing a simple cube:1. Locate the shader example project 01 Hello World and open the hello_world.cpp file.2. Example 4-1 shows the initialization code and the function to calculate the cameraposition:Example 4-1 Camera position for hello world#include using namespace MDE;static const float PI = 3.14159265;/*** Function that calculates the camera position given an angle and a radius. This function* enables the camera to rotate around the scene object.*/inline vec3 calculateCamPos(float radius, float angle){float angleRad = angle / 180 * PI;return vec3(radius * cos(angleRad), 2.0f, radius * sin(angleRad));}int main(int argc, char * argv[]){try{// Initialize the demo engine classesManaged system = create_system_backend();Managed context = system->createContext(320, 240);#ifdef MDE_OS_PC_LINUXManaged keyboard = system->createKeyboard(context);#elseManaged keyboard = system->createKeyboard();#endifManaged filesystem = system->createFileSystem(".");...Proxy proxy(filesystem, context);3. Unlike with the simple 2D examples, the shaders code is in an external file. The functiongetProgram() loads the shaders and manges their eventual destruction. See Example 4-2.Example 4-2 Loading the hello_world shaders......Program *helloWorldProgram =proxy.getProgram("shaders/hello_world.vert;shaders/hello_world.frag");4. Set the vertex position as shown in Example 4-3 on page 4-3.ARM DUI 0527A-02a Copyright © 2010 ARM. All rights reserved. 4-2ID070710Non-Confidential - Draft - Beta