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uniform mat4 mWorld;
uniform vec3 eyePosition;
uniform float animationTimer;
varying vec3 vNormal;
varying vec3 vPosition;
varying vec3 worldPosition;
varying lowp vec4 varColor;
varying mediump vec2 varTexCoord;
varying vec3 eyeVec;
varying float vIDiff;
const float e = 2.718281828459;
const float BS = 10.0;
float directional_ambient(vec3 normal)
{
vec3 v = normal * normal;
if (normal.y < 0.0)
return dot(v, vec3(0.670820, 0.447213, 0.836660));
return dot(v, vec3(0.670820, 1.000000, 0.836660));
}
void main(void)
{
varTexCoord = (mTexture * inTexCoord0).st;
gl_Position = mWorldViewProj * inVertexPosition;
vPosition = gl_Position.xyz;
vNormal = inVertexNormal;
worldPosition = (mWorld * inVertexPosition).xyz;
eyeVec = -(mWorldView * inVertexPosition).xyz;
#if (MATERIAL_TYPE == TILE_MATERIAL_PLAIN) || (MATERIAL_TYPE == TILE_MATERIAL_PLAIN_ALPHA)
vIDiff = 1.0;
#else
// This is intentional comparison with zero without any margin.
// If normal is not equal to zero exactly, then we assume it's a valid, just not normalized vector
vIDiff = length(inVertexNormal) == 0.0
? 1.0
: directional_ambient(normalize(inVertexNormal));
#endif
varColor = inVertexColor;
}
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