Mali GPU User Interface Engine Application Development Guide

Tutorial on Drawing 3D Shapes4.8 Lightshow animation with moving sprite and cameraThis tutorial combines:• a complex geometry asset• multiple varying light sources• frame rate calculation• automated movement of the camera• automated movement of a simple shape.Open the Lightshow example application:1. Example 4-58 shows the code in main.cpp that draws the flare:Example 4-58 Drawing the flare...void prepareFlares(Context* context, 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);void 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);2. Example 4-59 shows the code that traverses the tree that contains the paths:Example 4-59 Path traversal functionsvoid traverseTransform(Tree* node, mat4 parentTransform, float time){if (!node) return;traverseTransform(node->getNextSibling(), parentTransform, time);if (node->data)ARM DUI 0527A-02a Copyright © 2010 ARM. All rights reserved. 4-47ID070710Non-Confidential - Draft - Beta