Mali GPU User Interface Engine Application Development Guide

Tutorial on Constructing Custom Shaders6.6 Filling a shape with a bitmap textureThe examples in Minimal shader programs on page 6-12 use fixed or interpolated colors for thefragment color. To map a bitmap onto the shape:1. Example 6-18 shows the code to load the bitmap and create a texture:Example 6-18 Creating a texture from a bitmap fileManaged filesystem = system->createFileSystem(".");Proxy proxy(filesystem, context);...Program *texturingProgram =proxy.getProgram("shaders/texturing.vert;shaders/texturing.frag");Texture2D *texture = proxy.getTexture2D("data/rock_t.png");texture->setFilterMode(GL_NEAREST, GL_NEAREST);...2. The semantic entry in the VertexElement array must specify TEXTCOORD0 as shown inExample 6-19:Example 6-19 Modifying the VertexElement array to use a texture...Managed vertexBuffer =context->createBuffer(GL_ARRAY_BUFFER, sizeof(vertexData), sizeof(GLfloat)*5);vertexBuffer->setData(0, sizeof(vertexData), vertexData);context->setVertexBuffer(0, vertexBuffer);VertexElement elements[2];elements[0].components = 3;elements[0].offset = 0;elements[0].semantic = POSITION;elements[0].stream = 0;elements[0].type = GL_FLOAT;elements[1].components = 2;elements[1].offset = 3*sizeof(GLfloat);elements[1].semantic = TEXCOORD0;elements[1].stream = 0;elements[1].type = GL_FLOAT;Managed vertexDeclaration =context->createVertexDeclaration(elements, 2);context->setVertexDeclaration(vertexDeclaration);...3. Example 6-20 shows the use of setProgram() to connect the texturing program fromExample 6-18 to the context:Example 6-20 Create a texture program and a uniform sampler to use the bitmap...context->setProgram(texturingProgram);context->setUniformSampler("texture", static_cast(texture));...ARM DUI 0527A-02a Copyright © 2010 ARM. All rights reserved. 6-16ID070710Non-Confidential - Draft - Beta