Mali GPU User Interface Engine Application Development Guide

Tutorial on Constructing Custom Shadersmat4 world = mat4::identity();// create the transformation matrixmat4 wvpMatrix = proj * view * world;// define a light position that will be used with specular reflectionsvec3 lightPosition(75.0f, 75.0f, 0.0f);...// Initialize the uniformscontext->setUniform("LIGHT_POSITION", lightPosition);context->setUniform("CAMERA_POSITION", camPos);context->setUniform("AMBIENT_LIGHT", AMBIENT_LIGHT);context->setUniform("DIFFUSE_LIGHT", DIFFUSE_LIGHT);context->setUniform("SPECULAR_LIGHT", SPECULAR_LIGHT);context->setUniformSampler("diffuseTexture", diffuseTexture);context->setUniformSampler("normalMap", normalMap);...2. The vertex shader code in Example 6-32 is similar to the code in Example 6-27 onpage 6-21, except that the WORLD uniform is also passed to the shader:Example 6-32 Lighting initialization in bump map application code...// Enable depth test and start drawing loopglEnable(GL_DEPTH_TEST);do{// use keyboard input to rotate the camera or the object...wvpMatrix = proj * view * world;// set uniforms that have changed since the last drawcontext->setUniformMatrix("WORLD_VIEW_PROJECTION", wvpMatrix);context->setUniformMatrix("WORLD", world.toMat3());// Clear the screen and draw cube_asset with lightingglClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT );// call the assets own draw method to render the primitivescube_asset->draw();}while ( context->update() );...3. The vertex shader code in Example 6-33 calculates the position of a fragment based onthe interpolated POSITION value and a world view projection:Example 6-33 Lighting calculation in bump map vertex shaderuniform mat4 WORLD_VIEW_PROJECTION;uniform mat3 WORLD;uniform vec3 LIGHT_POSITION;uniform vec3 CAMERA_POSITION;attribute vec4 POSITION;attribute vec3 NORMAL;attribute vec3 TANGENT;ARM DUI 0527A-02a Copyright © 2010 ARM. All rights reserved. 6-24ID070710Non-Confidential - Draft - Beta