inline U32 GetARGB32_checked( const SFloatRGBAColor& src)
{
return ( ( ( (unsigned char)get_clamped((int)(src.alpha * 255.0f),0,255)) << 24 ) & 0xFF000000 ) |
( ( ( (unsigned char)get_clamped((int)(src.red * 255.0f),0,255)) << 16 ) & 0x00FF0000 ) |
( ( ( (unsigned char)get_clamped((int)(src.green * 255.0f),0,255)) << 8 ) & 0x0000FF00 ) |
( ( (unsigned char)get_clamped((int)(src.blue * 255.0f),0,255)) & 0x000000FF );
}
void PerlinNoiseNormalMapGenerator::FillTexture( LockedTexture& texture )
{
int w = texture.GetWidth();
int h = texture.GetHeight();
array2d<float> buffer;
buffer.resize( w, h, 0.0f );
GetPerlinTexture( m_Params, buffer );
for( int y=0; y<h; y++ )
{
for( int x=0; x<w; x++ )
{
Vector3 center( Vector3( 0, 0, buffer(x,y) ) );
Vector3 sum_normal( Vector3(0,0,0) );
// indices (clockwise order from the top)
Vector3 tips[4] =
{
Vector3( 0,-1, buffer( x, get_clamped(y-1,0,h-1) ) ),
Vector3( 1, 0, buffer( get_clamped(x+1,0,w-1), y ) ),
Vector3( 0, 1, buffer( x, get_clamped(y+1,0,w-1) ) ),
Vector3(-1, 0, buffer( get_clamped(x-1,0,w-1), y ) )
};
// int ix[4] = { x, get_clamped(x+1,0,w-1), x, get_clamped(x-1,0,w-1) };
// int iy[4] = { get_clamped(y-1,0,h-1), y, get_clamped(y+1,0,w-1), y };
for( int i=0; i<4; i++ )
{
Vector3 normal = Vec3Cross( tips[i] - center, tips[(i+1)%4] - center );
sum_normal += Vec3GetNormalized( normal );
}
Vector3 ave_normal = Vec3GetNormalized( sum_normal );
Vector3 offset_normal = ( ave_normal + Vector3(1,1,1) ) * 0.5f;
U8 a = 255;
U8 r = get_clamped( (U8)(offset_normal.x * 255), (U8)0, (U8)255 );
U8 g = get_clamped( (U8)(offset_normal.y * 255), (U8)0, (U8)255 );
U8 b = get_clamped( (U8)(offset_normal.z * 255), (U8)0, (U8)255 );
U32 argb32 = a << 24 | r << 16 | g << 8 | b;
texture.SetPixelARGB32( x, y, argb32 );
}
}
}
void PerlinNoiseTextureGenerator::FillTexture( LockedTexture& texture )
{
int w = texture.GetWidth();
int h = texture.GetHeight();
array2d<float> buffer;
buffer.resize( w, h, 0.0f );
GetPerlinTexture( m_Params, buffer );
for( int y=0; y<h; y++ )
{
for( int x=0; x<w; x++ )
{
U8 a=255,r=0,g=0,b=0;
r = g = b = get_clamped( (U8)(buffer(x,y) * 255), (U8)0, (U8)255 );
U32 argb32 = a << 24 | r << 16 | g << 8 | b;
texture.SetPixelARGB32( x, y, argb32 );
}
}
}
inline void clamp( T& val, const T& min_val, const T& max_val )
{
val = get_clamped( val, min_val, max_val );
}
