Mali GPU User Interface Engine Application Development Guide

Tutorial on Constructing Custom Shadersattribute vec3 BINORMAL;attribute vec3 TEXCOORD0;varying vec2 vTexCoord;varying vec3 vLightVector;varying vec3 vCameraVector;void main(void){gl_Position = WORLD_VIEW_PROJECTION * POSITION;vTexCoord = TEXCOORD0.st;vec3 pos = WORLD * POSITION.xyz;mat3 TBN = WORLD * mat3(normalize(TANGENT), normalize(BINORMAL),normalize(NORMAL));}// No point in normalizing before the fragment shader as the normalization will// be offset by the interpolation anyway.vLightVector = (LIGHT_POSITION - pos) * TBN;vCameraVector = (CAMERA_POSITION - pos) * TBN;4. Example 6-34 shows the fragment shader combining the light sources:Example 6-34 Summing light values in bump map fragment shaderuniform mat3 M_MATRIX;uniform sampler2D diffuseTexture;uniform sampler2D normalMap;uniform vec3 AMBIENT_LIGHT;uniform vec3 DIFFUSE_LIGHT;uniform vec3 SPECULAR_LIGHT;uniform float DIFFUSE_CONTRIBUTION;uniform float SPECULAR_CONTRIBUTION;uniform float AMBIENT;varying vec2 vTexCoord;varying vec3 vLightVector;varying vec3 vCameraVector;void main(void){// read the normal value for this point from the texturevec3 normal = normalize(texture2D(normalMap, vTexCoord).rgb * 2.0 - 1.0);// read the color for this point from the texturevec4 color = texture2D(diffuseTexture, vTexCoord);// calculate the intensity of the diffuse light reflected off the pointvec3 lightVector = normalize(vLightVector);float nDotL = max(dot(normal, lightVector), 0.0);vec3 diffuse = DIFFUSE_LIGHT * nDotL;// calculate the multiplier for the specular reflectionfloat specPow = 0.0; // was 0// if the nDotL value is less than 0, use 0.0 for the specular multiplierif (nDotL > 0.0){vec3 cameraVector = normalize(vCameraVector);// what is the reflection based on the normal and the camera viewvec3 reflectVector = reflect(-cameraVector, normal);ARM DUI 0527A-02a Copyright © 2010 ARM. All rights reserved. 6-25ID070710Non-Confidential - Draft - Beta