Mali GPU User Interface Engine Application Development Guide

Tutorial on Constructing Custom Shadersvec3 lightVector = normalize(vLightVector);float nDotL = max(dot(normal, lightVector), 0.0);vec3 diffuse = DIFFUSE_LIGHT * nDotL;float specPow = 0.0;if (nDotL > 0.0){vec3 cameraVector = normalize(vCameraVector);}vec3 reflectVector = reflect(-cameraVector, normal);specPow = pow(max(dot(reflectVector, lightVector), 0.0), 16.0);vec3 specular = SPECULAR_LIGHT * specPow;}gl_FragColor = vec4(AMBIENT_LIGHT, 1.0) * COLOR +vec4(diffuse, 1.0) * COLOR +vec4(specular, 1.0);6.7.3 Example showing calculation of bump-mapped reflectionsThe application code in Example 6-29 on page 6-22 uses an interpolated vertex color for thefragment. To use normal and diffuse texture samplers:1. The example in Example 6-31 uses normal and diffuse texture samplers from bitmaps tomodify the reflections:Example 6-31 Context initialization in bump map application code// initialize the context and MDE classes...// load the shader code...// Loading scene from a Mali Binary Asset file eliminates the requirement to// construct an arrow of primitive shapesSceneAsset* 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));// this bitmap creates a texture used with the diffuse light calculationTexture2D *diffuseTexture =proxy.getTexture2DAsset("rock_t.png")->getTexture2D();// this bitmap creates a texture used with the specular light calculationTexture2D *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);ARM DUI 0527A-02a Copyright © 2010 ARM. All rights reserved. 6-23ID070710Non-Confidential - Draft - Beta