Mali GPU User Interface Engine Application Development Guide

Tutorial on Drawing 2D Shapes3.3 Drawing a rectangle with a custom textureThis section describes how to draw a rectangle and apply a custom texture:1. Locate the tutorial project 07 - Texturing and open the main.cpp file.2. Example 3-1 on page 3-2 shows the standard includes and initialization:Example 3-14 Creating the context for the texture example#include using namespace MDE;int main(){try{Managed system = create_system_backend();Managed context = system->createContext(320, 240);#ifdef MDE_OS_PC_LINUXManaged keyboard = system->createKeyboard(context);#elseManaged keyboard = system->createKeyboard();#endif// Define the shader sources. Basic texturing shaders.const char* vertexsource ="attribute vec4 POSITION;\attribute vec2 TEXCOORD0;\varying vec2 texcoord;\void main(void)\{\gl_Position = POSITION;\texcoord = TEXCOORD0;\}";const char* fragmentsource ="precision mediump float; \varying vec2 texcoord;\uniform sampler2D texture;\void main(void)\{\gl_FragColor = texture2D(texture, texcoord);\}";...// Create Shader and Program objects:Managed vertexshader = context->createShader(GL_VERTEX_SHADER, vertexsource);Managed fragmentshader = context->createShader(GL_FRAGMENT_SHADER, fragmentsource);Managed program = context->createProgram(vertexshader, fragmentshader);context->setProgram(program);3. A bit-mapped texture is typically read from a file rather than created in the application.This example however defines the texture data and uses it to create a new texture objectas shown in Example 3-2 on page 3-2:ARM DUI 0527A-02a Copyright © 2010 ARM. All rights reserved. 3-11ID070710Non-Confidential - Draft - Beta