kmMat4* hueRotation(kmMat4* m, float r) {
kmMat4 mat0;
kmMat4 mat1;
kmMat4 temp;
// Make an identity matrix.
kmMat4Identity(&mat0);
// Rotate the grey vector into positive Z.
// Sin = 1/sqrt(2).
// Cos = 1/sqrt(2).
kmMat4RotationX(&temp, M_PI_4);
kmMat4Multiply(&mat1, &temp, &mat0);
// Sin = -1/sqrt(3).
// Cos = sqrt(2/3).
kmMat4RotationY(&temp, -0.615479709);
kmMat4Multiply(&mat0, &temp, &mat1);
// Shear the space to make the luminance plane horizontal.
float lx, ly, lz;
xformRGB(&mat0, rwgt, gwgt, bwgt, &lx, &ly, &lz);
float zsx = lx / lz;
float zsy = ly / lz;
shearZMatrix(&temp, zsx, zsy);
kmMat4Multiply(&mat1, &temp, &mat0);
// Rotate the hue.
float rad = r * M_PI / 180;
kmMat4RotationZ(&temp, rad);
kmMat4Multiply(&mat0, &temp, &mat1);
// Unshear the space to put the luminance plane back.
shearZMatrix(&temp, -zsx, -zsy);
kmMat4Multiply(&mat1, &temp, &mat0);
// Rotate the grey vector back into place.
// Sin = 1/sqrt(3).
// Cos = sqrt(2/3);
kmMat4RotationY(&temp, 0.615479709);
kmMat4Multiply(&mat0, &temp, &mat1);
// Sin = -1/sqrt(2).
// Cos = 1/sqrt(2).
kmMat4RotationX(&temp, -M_PI_4);
kmMat4Multiply(&mat1, &temp, &mat0);
kmMat4Fill(m, mat1.mat);
return m;
}
void setMatrixAndColorTransform(const Matrix *m, const ColorTransform *cx)
{
bool changed = m_matrix.SetWithComparing(m);
if (changed) {
kmScalar mat[] = {
m->scaleX, -m->skew1, 0, 0,
m->skew0, -m->scaleY, 0, 0,
0, 0, 1, 0,
m->translateX, -m->translateY, 0, 1};
kmMat4Fill(&_transform, mat);
setDirty(true);
}
cocos2d::LWFNode *node = (cocos2d::LWFNode *)getParent();
const Color &c = cx->multi;
const cocos2d::Color3B &dc = node->getDisplayedColor();
setColor(cocos2d::Color3B(
(GLubyte)(c.red * m_red * dc.r),
(GLubyte)(c.green * m_green * dc.g),
(GLubyte)(c.blue * m_blue * dc.b)));
setOpacity((GLubyte)(c.alpha * node->getDisplayedOpacity()));
}
const kmMat4& Node::getNodeToParentTransform() const
{
if (_transformDirty)
{
// Translate values
float x = _position.x;
float y = _position.y;
float z = _positionZ;
if (_ignoreAnchorPointForPosition)
{
x += _anchorPointInPoints.x;
y += _anchorPointInPoints.y;
}
// Rotation values
// Change rotation code to handle X and Y
// If we skew with the exact same value for both x and y then we're simply just rotating
float cx = 1, sx = 0, cy = 1, sy = 0;
if (_rotationZ_X || _rotationZ_Y)
{
float radiansX = -CC_DEGREES_TO_RADIANS(_rotationZ_X);
float radiansY = -CC_DEGREES_TO_RADIANS(_rotationZ_Y);
cx = cosf(radiansX);
sx = sinf(radiansX);
cy = cosf(radiansY);
sy = sinf(radiansY);
}
bool needsSkewMatrix = ( _skewX || _skewY );
// optimization:
// inline anchor point calculation if skew is not needed
// Adjusted transform calculation for rotational skew
if (! needsSkewMatrix && !_anchorPointInPoints.equals(Point::ZERO))
{
x += cy * -_anchorPointInPoints.x * _scaleX + -sx * -_anchorPointInPoints.y * _scaleY;
y += sy * -_anchorPointInPoints.x * _scaleX + cx * -_anchorPointInPoints.y * _scaleY;
}
// Build Transform Matrix
// Adjusted transform calculation for rotational skew
kmScalar mat[] = {
cy * _scaleX, sy * _scaleX, 0, 0,
-sx * _scaleY, cx * _scaleY, 0, 0,
0, 0, _scaleZ, 0,
x, y, z, 1 };
kmMat4Fill(&_transform, mat);
// XXX
// FIX ME: Expensive operation.
// FIX ME: It should be done together with the rotationZ
if(_rotationY) {
kmMat4 rotY;
kmMat4RotationY(&rotY,CC_DEGREES_TO_RADIANS(_rotationY));
kmMat4Multiply(&_transform, &_transform, &rotY);
}
if(_rotationX) {
kmMat4 rotX;
kmMat4RotationX(&rotX,CC_DEGREES_TO_RADIANS(_rotationX));
kmMat4Multiply(&_transform, &_transform, &rotX);
}
// XXX: Try to inline skew
// If skew is needed, apply skew and then anchor point
if (needsSkewMatrix)
{
kmMat4 skewMatrix = { 1, (float)tanf(CC_DEGREES_TO_RADIANS(_skewY)), 0, 0,
(float)tanf(CC_DEGREES_TO_RADIANS(_skewX)), 1, 0, 0,
0, 0, 1, 0,
0, 0, 0, 1};
kmMat4Multiply(&_transform, &_transform, &skewMatrix);
// adjust anchor point
if (!_anchorPointInPoints.equals(Point::ZERO))
{
// XXX: Argh, kmMat needs a "translate" method.
// XXX: Although this is faster than multiplying a vec4 * mat4
_transform.mat[12] += _transform.mat[0] * -_anchorPointInPoints.x + _transform.mat[4] * -_anchorPointInPoints.y;
_transform.mat[13] += _transform.mat[1] * -_anchorPointInPoints.x + _transform.mat[5] * -_anchorPointInPoints.y;
}
}
if (_useAdditionalTransform)
{
kmMat4Multiply(&_transform, &_transform, &_additionalTransform);
}
_transformDirty = false;
}
return _transform;
}
