Mali GPU User Interface Engine Application Development Guide

Tutorial on the Lotion User Interface Classes5.4.2 Modified startup code in lightshow.cppThe original lighshow.cpp file in ...\example_applications\lightshow is not the same as the onein ...\lotion\applets\lightshow:• the standalone application is converted to a be a class• additional code is added to interface with the theme and application classes.The modified lightshow.cpp file uses the header file and the Lotion namespaces as shown in :Example 5-20 Namespace for lightshow// add reference to new header file#include "lightshow.h"// remove low-level includesusing namespace MDE;namespace Lotion // use Lotion namespace{namespace Applets // use Applets namespace{...}}The first part of lightshow.cpp file is similar to the original, except that some widget code hasbeen added as shown in Example 5-21:Example 5-21 Functions in lightshow.cpp// same as original except now class methodvoid LightShow::prepareFlares(Context* context, MDE::Program* p){float texcoords[] = { 0, 0, 1, 0, 1, 1, 0, 1 };flareTexcoord = context->createBuffer(GL_ARRAY_BUFFER,sizeof(texcoords), 8);flareTexcoord->setData(0, sizeof(texcoords), texcoords);flareTexcoordsLoc = p->getAttribLocation(TEXCOORD0);}// same as original except now class methodvoid LightShow::drawFlare(Context* context, vec3 position, vec3 color, float size){context->setUniform("position", position);context->setUniform("color", color);context->setUniform("size", size);glEnableVertexAttribArray(flareTexcoordsLoc);glBindBuffer(GL_ARRAY_BUFFER, flareTexcoord->getHandle());glVertexAttribPointer(flareTexcoordsLoc, 2, GL_FLOAT, GL_FALSE, 0, 0);unsigned short indices[] = { 0, 1, 2, 0, 2, 3 };glDrawElements(GL_TRIANGLES, 6, GL_UNSIGNED_SHORT, indices);}glDisableVertexAttribArray(flareTexcoordsLoc);ARM DUI 0527A-02a Copyright © 2010 ARM. All rights reserved. 5-26ID070710Non-Confidential - Draft - Beta