Mali GPU User Interface Engine Application Development Guide

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Tutorial on Drawing 2D Shapes...elements[1].type = GL_FLOAT;elements[1].normalize = true;The colorBuffer array is not required because the color information is now part of thevertexData array.The offset for elements[1] must be specified as 2*sizeof(GLfloat) to jump over theposition values.4. The triangle has been specified, so it can be drawn as shown in Example 3-6 on page 3-5.Example 3-13 Using the vertex information to draw the triangle...do{context->setVertexBuffer(0, vertexBuffer);context->setVertexBuffer(1, vertexBuffer);/* Draw indexed triangles using the first 3 vertices of the buffers */context->drawArrays(GL_TRIANGLES, 0, 1);if(keyboard->getSpecialKeyState(Keyboard::KEY_ESCAPE)) break;} while( context->update() );}}catch(Exception& e){printf("MDE \n%s\n\n", e.getMessage().getCharString());}Unlike in Example 3-6 on page 3-5, the context uses vertexBuffer for both stream 0 andstream 1 because both stream values are contained in one array.5. Rebuild the project and run it. Figure 3-3 on page 3-9 shows the triangle appearance hasnot changed:Figure 3-4 The 2D triangle with combined position and color values in one vertexBuffer arrayARM DUI 0527A-02a Copyright © 2010 ARM. All rights reserved. 3-10ID070710Non-Confidential - Draft - Beta
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
Page 1 and 2: MaliGPU User Interface EngineVersio
Page 3 and 4: ContentsMali GPU User Interface Eng
Page 5 and 6: List of TablesMali GPU User Interfa
Page 7 and 8: List of FiguresFigure 4-17 Environm
Page 9 and 10: PrefaceAbout this bookThis is the M
Page 11 and 12: PrefaceFeedbackARM welcomes feedbac
Page 13 and 14: Introduction1.1 About the Mali GPU
Page 15 and 16: IntroductionProxygetLoader()LoaderA
Page 17 and 18: Chapter 2Tutorial on the System Cla
Page 19 and 20: Tutorial on the System Classes2.2 C
Page 21 and 22: Tutorial on the System ClassesFigur
Page 23 and 24: Tutorial on the System ClassesDrawi
Page 29 and 30: Chapter 3Tutorial on Drawing 2D Sha
Page 31 and 32: Tutorial on Drawing 2D Shapes...con
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Page 44 and 45: Tutorial on Drawing 3D Shapes4.1 Dr
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Tutorial on the Lotion User Interfa
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Chapter 6Tutorial on Constructing C
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Tutorial on Constructing Custom Sha
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Appendix AMatrix and Vector Operati
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Matrix and Vector Operationsmat4 pe
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GlossaryThis glossary describes som
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GlossaryShader LibraryVertex shader
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Mali GPU User Interface Engine Application Development Guide

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