Mali GPU User Interface Engine Application Development Guide

Tutorial on Drawing 3D ShapesExample 4-4 Setting the hello_world projection...// The camera position, target and up vector for use when creating the view matrixfloat cameraAngle = 45.0f;vec3 camPos = calculateCamPos(4.0f, cameraAngle);vec3 camTarget = vec3(0.0f, 0.0f, 0.0f);vec3 upVector = vec3(0.0f, 1.0f, 0.0f);// Set up the view and projection matrices and multiply them to get the// modelviewprojection matrix.mat4 world = mat4::identity();mat4 proj = mat4::perspective(35.0f, 1.0f, 0.1f, 20.0f);mat4 view = mat4::lookAt(camPos, camTarget, upVector);mat4 wvpMatrix = proj * view;...context->setProgram(helloWorldProgram);glEnable(GL_DEPTH_TEST);6. The do loop checks for keyboard input and either rotates the object or changes the cameraposition. See Example 4-5.Example 4-5 Processing hello_world input and changing the view...do{// Exit the application if escape pressedif (keyboard->getSpecialKeyState(Keyboard::KEY_ESCAPE)){return 0;}// Rotate object or cameraif (keyboard->getSpecialKeyState(Keyboard::KEY_SPACE)){if (keyboard->getSpecialKeyState(Keyboard::KEY_LEFT)){camPos = calculateCamPos(4.0f, ++cameraAngle);view = mat4::lookAt(camPos, camTarget, upVector);}if (keyboard->getSpecialKeyState(Keyboard::KEY_RIGHT)){camPos = calculateCamPos(4.0f, --cameraAngle);view = mat4::lookAt(camPos, camTarget, upVector);}}else{if (keyboard->getSpecialKeyState(Keyboard::KEY_RIGHT)){world *= mat4::rotation(1.0f, vec3(0.0f, 1.0f, 0.0f));}if (keyboard->getSpecialKeyState(Keyboard::KEY_LEFT)){world *= mat4::rotation(-1.0f, vec3(0.0f, 1.0f, 0.0f));ARM DUI 0527A-02a Copyright © 2010 ARM. All rights reserved. 4-4ID070710Non-Confidential - Draft - Beta