Mali GPU User Interface Engine Application Development Guide

Tutorial on Drawing 3D Shapesvarying vec3 vLightVector;varying vec3 vCameraVector;void main(void){// set the global that indicates this fragment positiongl_Position = WORLD_VIEW_PROJECTION * POSITION;// set the value to look up from the image bitmapvTexCoord = TEXCOORD0.st;// calculate the vector that identifies this point in the world projectionvec3 pos = WORLD * POSITION.xyz;// calculate the normals for the point on the shapemat3 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.}// calculate the light vector for the point and multiply it b the world transformvLightVector = (LIGHT_POSITION - pos) * TBN;// calculate the camera vector for the point and multiply it b the world transformvCameraVector = (CAMERA_POSITION - pos) * TBN;6. The fragment shader uses the contents of the rock_n.png file to compute the reflection asshown in Example 4-36:Example 4-36 bumpmapping.frag contents#ifdef GL_ESprecision mediump float;#endif// constant values for the primitive shapeuniform 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;// passed from the vertex shadervarying vec2 vTexCoord;varying vec3 vLightVector;varying vec3 vCameraVector;void main(void){// An optimization would be to assume that the precomputed normals in the normalMap// is already of a length of 1.0. That way the normalization would be unnecessary.vec3 normal = normalize(texture2D(normalMap, vTexCoord).rgb * 2.0 - 1.0);vec4 color = texture2D(diffuseTexture, vTexCoord);// what is the contribution of the diffuse light based on the relative// angle between the light and the normal read from the bitmap filevec3 lightVector = normalize(vLightVector);ARM DUI 0527A-02a Copyright © 2010 ARM. All rights reserved. 4-27ID070710Non-Confidential - Draft - Beta