Mali GPU User Interface Engine Application Development Guide

Tutorial on Drawing 3D Shapesvec3 pos = WORLD * POSITION.xyz;vec3 lightVector = normalize(LIGHT_POSITION - pos);float nDotL = max(dot(normal, lightVector), 0.0);vDiffuse = DIFFUSE_LIGHT * nDotL;// No point in calculating specular reflections from the backside of vertices.float specPow = 0.0;if (nDotL > 0.0){vec3 cameraVector = normalize(CAMERA_POSITION - pos);}vec3 reflectVector = reflect(-cameraVector, normal);specPow = pow(max(dot(reflectVector, lightVector), 0.0), 4.0);}vSpecular = SPECULAR_LIGHT * specPow;Fragment lighting programper_fragment_lighting.vert for the vertex shader andper_fragment_lighting.frag for the fragment shader. Theper_fragment_lighting.frag fragment shader uses the data in the normalbitmap to calculate the reflections as shown in Example 4-21:Example 4-21 per_fragment_lighting.frag#ifdef GL_ESprecision mediump float;#endifuniform vec3 AMBIENT_LIGHT;uniform vec3 DIFFUSE_LIGHT;uniform vec3 SPECULAR_LIGHT;uniform vec4 COLOR;varying vec3 vNormal;varying vec3 vLightVector;varying vec3 vCameraVector;void main(void){vec3 normal = normalize(vNormal);vec3 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 +ARM DUI 0527A-02a Copyright © 2010 ARM. All rights reserved. 4-17ID070710Non-Confidential - Draft - Beta