Mali GPU User Interface Engine Application Development Guide

Tutorial on Drawing 2D ShapesExample 3-15 Identity shaders...const int size = 8;unsigned int textureData[size*size];unsigned int color = 0xFFFFFFFF;for(int y = 0; y < size; y++){for(int x = 0; x < size; x++ ){color ^= 0xFFFFFF;textureData[y*size+x] = color;}color ^= 0xFFFFFF;}// create an empty texture named checkerBoardManaged checkerBoard = context->createTexture2D();checkerBoard->setFilterMode(GL_NEAREST, GL_NEAREST);...// use the textureData array to fill the texturecheckerBoard->buildMipmaps(0, size, size, GL_RGBA, textureData);The MipMaps object is used, and the dimensions of the rendered shape and the texturesource are different.Note• The checkboard texture is a 2D shape.• The fragmentshader texture sets the pixel value based on the value of a point in the2D texture shape:gl_FragColor = texture2D(texture, texcoord);4. As with Example 3-9 on page 3-8 which combined the vertex and color data in one array,the code in Example 3-16 combines the vertices and texture locations:Example 3-16 Specifying the location for the shape and texture......GLfloat vertexData[24] ={// X Y U V-1.0f, -1.0f, 0.0f, 0.0f, // values for each vertex of the first triangle1.0f, -1.0f, 1.0f, 0.0f,-1.0f, 1.0f, 0.0f, 1.0f,1.0f, -1.0f, 1.0f, 0.0f, // values for each vertex of the second triangle1.0f, 1.0f, 1.0f, 1.0f,-1.0f, 1.0f, 0.0f, 1.0f};/* Set up the vertex buffer */Managed vertexBuffer = context->createBuffer(GL_ARRAY_BUFFER, sizeof(vertexData),sizeof(GLfloat)*4);vertexBuffer->setData(0, sizeof(vertexData), vertexData);ARM DUI 0527A-02a Copyright © 2010 ARM. All rights reserved. 3-12ID070710Non-Confidential - Draft - Beta