Mali GPU User Interface Engine Application Development Guide

Tutorial on Constructing Custom Shadersvoid main(void){gl_Position = WORLD_VIEW_PROJECTION * POSITION;vColor = COLOR;// fragment shader assigns this to gl_FragColor}6.7.2 Example showing calculation of specular reflectionsThe application code in Example 6-23 on page 6-18 uses an interpolated vertex color for thefragment. The example in Example 6-26 calculates the light based on the vectors that specifythe different light sources:Example 6-26 Context initialization in lighting application code...// define constants for the light colorsstatic const vec3 AMBIENT_LIGHT = vec3 (0.1f, 0.1f, 0.1f);static const vec3 DIFFUSE_LIGHT = vec3(0.5f, 0.5f, 0.5f);static const vec3 SPECULAR_LIGHT = vec3(0.5f, 0.5f, 0.5f);static const vec4 COLOR = vec4(1.0f, 0.0f, 0.0f, 1.0f);...// define the calculateCamPos that returns a vec3 given an angle and radius// enables the camera to rotate about the scene object...// initialize the context and MDE classes...// load the shader code...// Loading scene from a Mali Binary Asset fileSceneAsset* scene = proxy.getSceneAsset("cube.mba");// get the asset from the mba file and assign it to the cube_asset variableGeometryAsset* cube_asset =static_cast(scene->getAsset(Asset::TYPE_GEOMETRY, 0));Texture2D *diffuseTexture =proxy.getTexture2DAsset("rock_t.png")->getTexture2D();Texture2D *normalMap =proxy.getTexture2DAsset("rock_n.png")->getTexture2D();// Initialize the camera position, target, and up vectorfloat cameraAngle = 0.0f;vec3 camPos = calculateCamPos(75.0f, cameraAngle);vec3 camTarget = vec3(0.0f, 0.0f, 0.0f);vec3 upVector = vec3(0.0f, 0.0f, 1.0f);// Set up the view, projection and world matrices and multiply them to get the// modelviewprojection and modelview matrices.mat4 view = mat4::lookAt(camPos, camTarget, upVector);mat4 proj = mat4::perspective(60.0f, 4.0f/3.0f, 1.0f, 500.0f);mat4 world = mat4::identity();// create the transformation matrixmat4 wvpMatrix = proj * view * world;// define the light positionvec3 LightPosition(75.f, 75.f, 0.0f)...ARM DUI 0527A-02a Copyright © 2010 ARM. All rights reserved. 6-20ID070710Non-Confidential - Draft - Beta