Mali GPU User Interface Engine Application Development Guide

Tutorial on Drawing 3D ShapesExample 4-48 Set the camera, projection, view, and world for cube mapping...// 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, 1.0f, 0.0f);// Set up the view, projection and world matrices. We don't precalculate the// modelviewprojection-matrices because it will have to be changed for each frame// as we change the view matrix to rotate the camera.mat4 view = mat4::lookAt(camPos, camTarget, upVector);mat4 proj = mat4::perspective(60.0f, 4.0f/3.0f, 1.0f, 300.0f);// Set up the world matrix for the object.mat4 world_object = mat4::rotation(90.0, vec3(-1.0f, 0.0f, 0.0f)) *mat4::rotation(90.0, vec3(0.0f, 0.0f, 1.0f));mat4 wvpMatrix_object;// Set up the world matrix for the skybox.mat4 world_skybox = mat4::scale(200.0f, 200.0f, 200.0f);mat4 wvpMatrix_skybox;mat4 tmp;...glEnable(GL_DEPTH_TEST);7. Example 4-49 shows the part of the draw loop that reacts to keyboard input to change thecamera, view, and lighting:Example 4-49 Use the to keyboard input to change the cube mapping view...do{glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT );// Exit the applicationif (keyboard->getSpecialKeyState(Keyboard::KEY_ESCAPE)){return 0;}// Rotate object or cameraif (keyboard->getSpecialKeyState(Keyboard::KEY_SPACE)){if (keyboard->getSpecialKeyState(Keyboard::KEY_LEFT)){camPos = calculateCamPos(75.0f, --cameraAngle);view = mat4::lookAt(camPos, camTarget, upVector);}if (keyboard->getSpecialKeyState(Keyboard::KEY_RIGHT)){camPos = calculateCamPos(75.0f, ++cameraAngle);view = mat4::lookAt(camPos, camTarget, upVector);}}elseARM DUI 0527A-02a Copyright © 2010 ARM. All rights reserved. 4-38ID070710Non-Confidential - Draft - Beta