1 uniform sampler2D sTexture; 2 uniform sampler2D sNormalMap; 3 uniform bool bUseDot3; 4 5 varying mediump vec2 TexCoord; 6 varying mediump vec3 Light; 7 8 void main() 9 { 10 if(bUseDot3) 11 { 12 /* 13 Note: 14 In the normal map red = y, green = x, blue = z which is why when we get the normal 15 from the texture we use the swizzle .grb so the colours are mapped to the correct 16 co-ordinate variable. 17 */ 18 19 mediump vec3 fNormal = texture2D(sNormalMap, TexCoord).grb; 20 mediump float fNDotL = dot((fNormal - 0.5) * 2.0, Light); 21 22 gl_FragColor = texture2D(sTexture, TexCoord) * fNDotL; 23 } 24 else 25 gl_FragColor = texture2D(sTexture, TexCoord) * Light.x; 26 } 27
