Mali GPU User Interface Engine Application Development Guide

Tutorial on Drawing 2D Shapes3.1 Drawing a triangleThis section describes how to draw a 2D triangle:1. Select the tutorial project 06 - Drawing a Triangle the Hard Way and open the main.cppfile.2. Example 3-1 shows placing the processing code, including the initialization code for thecontext and keyboard, in to a try block:Example 3-1 Creating the system objects#include using namespace MDE;int main(int argc, char** argv){try{Managed system = create_system_backend();Managed context = system->createContext(320, 240);Managed timer = system->createTimer();#ifdef MDE_OS_PC_LINUXManaged keyboard = system->createKeyboard(context);#elseManaged keyboard = system->createKeyboard();#endif...Use the Context interface to:• create a context to draw with• create GL objects that are linked to a context such as:— textures— buffers— shader programs.3. Because this example actually draws a shape to the context, there must be a vertex andfragment shader. Example 3-2 shows how to define simple identity shaders:Example 3-2 Identity shaders.../** Define the shader sources. The following GLSL shaders define a simple identity-transform vertex* shader and a fragment shader which outputs the color value calculated in the vertex shader.*/const char* vertexsource ="attribute vec4 POSITION; \attribute vec4 COLOR;\varying vec4 col;\void main(void)\{\col = COLOR;\gl_Position = POSITION;\}";ARM DUI 0527A-02a Copyright © 2010 ARM. All rights reserved. 3-2ID070710Non-Confidential - Draft - Beta