Mali GPU User Interface Engine Application Development Guide

Tutorial on Drawing 3D ShapesExample 4-24 Set the camera, projection, view, and world for the teapot...// The camera position, target and up vector for use when creating the view matrixfloat cameraAngle = 0.0f;vec3 camPos = calculateCamPos(75.0f, cameraAngle);vec3 camTarget = vec3(0.0f, 0.0f, 0.0f);vec3 upVector = vec3(0.0f, 0.0f, 1.0f);// Set up the view, projection and world matrices and multiply them to get the// modelviewprojection and modelview matrices.mat4 view = mat4::lookAt(camPos, camTarget, upVector);mat4 proj = mat4::perspective(60.0f, 4.0f/3.0f, 1.0f, 500.0f);mat4 world = mat4::rotation(90.0f, vec3(0.0f, 0.0f, 1.0f));mat4 wvpMatrix = proj * view * world;bool perVertexLighting = true;vec3 lightPosition(75.0f, 75.0f, 0.0f);// Enable depth testglEnable(GL_DEPTH_TEST);...6. Example 4-25 shows the part of the draw loop that reacts to keyboard input to change thecamera, view, and lighting:Example 4-25 Use the to keyboard input to change the teapot view, camera, and lighting...do{// Exit the application if escape key pressedif (keyboard->getSpecialKeyState(Keyboard::KEY_ESCAPE)){return 0;}// toggle lighting model if UP key is pressedstatic float time = timer->getTime();if (keyboard->getSpecialKeyState(Keyboard::KEY_UP)){perVertexLighting = !perVertexLighting;}if (perVertexLighting){context->setProgram(perVertexLightingProgram);}else{context->setProgram(perFragmentLightingProgram);}// Rotate object or cameraif (keyboard->getSpecialKeyState(Keyboard::KEY_SPACE)){if (keyboard->getSpecialKeyState(Keyboard::KEY_LEFT)){ARM DUI 0527A-02a Copyright © 2010 ARM. All rights reserved. 4-19ID070710Non-Confidential - Draft - Beta