/// Assert that the two HSLs represent the same-looking color
/// (as opposed to having exactly the same values)
public static void AssertNearlyEqualHSL(HSLColor lhs, HSLColor rhs)
{
float eps = 1e-6f;
float dist = (HslAsRectilinear(lhs) - HslAsRectilinear(rhs)).magnitude;
if (!AlmostEqual(dist, 0, eps) ||
!AlmostEqual(lhs.a, rhs.a, eps))
{
Assert.Fail("{0} !~ {1}", Repr(lhs), Repr(rhs));
}
}
// Convert from polar to rectilinear coordinates for ease of comparison
static Vector3 HslAsRectilinear(HSLColor hsl)
{
float radius = .5f - Mathf.Abs(hsl.l - .5f);
radius = radius * hsl.s;
float angle = hsl.HueDegrees * Mathf.Deg2Rad;
return(new Vector3(radius * Mathf.Cos(angle),
radius * Mathf.Sin(angle),
hsl.l));
}
/// Assert that the two colors have the same field values
/// and that orthogonal dimensions are preserved for some L and S edge cases.
public static void AssertNearlyEqualHSLStrict(HSLColor lhs, HSLColor rhs)
{
float eps = 1e-4f;
if (!HueAlmostEqual(lhs.h, rhs.h, eps) ||
!AlmostEqual(lhs.s, rhs.s, eps) ||
!AlmostEqual(lhs.l, rhs.l, eps) ||
!AlmostEqual(lhs.a, rhs.a, eps))
{
Assert.Fail("{0} !~ {1}", Repr(lhs), Repr(rhs));
}
}
//
// Utility methods
//
protected static string Repr(HSLColor hsl)
{
return(string.Format("<HSLA {0} {1} {2} {3}>", hsl.h, hsl.s, hsl.l, hsl.a));
}
/// Unconditionally increments m_LeadingQuadIndex by 1 or 2
private void AppendLeadingQuad(
bool bGenerateNew, float opacity01,
Vector3 vCenter, Vector3 vForward, Vector3 vNormal,
Vector3 vRight, MasterBrush rMasterBrush,
out int earliestChangedQuad)
{
// Get the current stroke from the MasterBrush so that quad positions and
// orientations can be calculated.
Vector3[] aVerts = rMasterBrush.m_Vertices;
Vector3[] aNorms = rMasterBrush.m_Normals;
Color32[] aColors = rMasterBrush.m_Colors;
int stride = Stride;
// Lay leading quad
int iVertIndex = m_LeadingQuadIndex * 6;
PositionQuad(aVerts, iVertIndex, vCenter, vForward, vRight);
for (int i = 0; i < 6; ++i)
{
aNorms[iVertIndex + i] = vNormal;
}
earliestChangedQuad = m_LeadingQuadIndex;
Color32 cColor = m_Color;
cColor.a = (byte)(opacity01 * 255.0f);
Color32 cLastColor = (iVertIndex - stride >= 0) ? aColors[iVertIndex - stride + 4] : cColor;
aColors[iVertIndex] = cLastColor;
aColors[iVertIndex + 1] = cColor;
aColors[iVertIndex + 2] = cLastColor;
aColors[iVertIndex + 3] = cLastColor;
aColors[iVertIndex + 4] = cColor;
aColors[iVertIndex + 5] = cColor;
++m_LeadingQuadIndex;
// Create duplicates if we have backfaces enabled.
if (m_EnableBackfaces)
{
int iCurrVertIndex = m_LeadingQuadIndex * 6;
CreateDuplicateQuad(aVerts, aNorms, m_LeadingQuadIndex, vNormal);
Color32 backColor, lastBackColor;
if (m_Desc.m_BackfaceHueShift == 0)
{
backColor = cColor;
lastBackColor = cLastColor;
}
else
{
HSLColor hsl = (HSLColor)(Color)m_Color;
hsl.HueDegrees += m_Desc.m_BackfaceHueShift;
backColor = (Color32)(Color)hsl;
lastBackColor = (iCurrVertIndex - stride >= 0)
? aColors[iCurrVertIndex - stride + 4]
: backColor;
}
aColors[iCurrVertIndex] = lastBackColor;
aColors[iCurrVertIndex + 1] = lastBackColor;
aColors[iCurrVertIndex + 2] = backColor;
aColors[iCurrVertIndex + 3] = lastBackColor;
aColors[iCurrVertIndex + 4] = backColor;
aColors[iCurrVertIndex + 5] = backColor;
++m_LeadingQuadIndex;
}
// Walk backward and smooth out previous quads.
int iStripLength = m_LeadingQuadIndex; // In solids
int iSegmentLength = m_LeadingQuadIndex - m_InitialQuadIndex; // In solids
if (m_EnableBackfaces)
{
iStripLength /= 2;
iSegmentLength /= 2;
}
// We don't need to smooth anything if our strip is only 1 quad.
if (iStripLength > 1)
{
// Indexes for later use
int iIndexingOffset = m_EnableBackfaces ? 2 : 1;
int iBackQuadIndex = m_LeadingQuadIndex - (3 * iIndexingOffset);
int iBackQuadVert = iBackQuadIndex * 6;
int iMidQuadIndex = m_LeadingQuadIndex - (2 * iIndexingOffset);
int iMidQuadVert = iMidQuadIndex * 6;
int iFrontQuadIndex = m_LeadingQuadIndex - iIndexingOffset;
int iFrontQuadVert = iFrontQuadIndex * 6;
if (iSegmentLength == 1)
{
// If we've got a long strip, but this segment is only 1 quad, touch up the previous quad.
PositionQuad(aVerts, iMidQuadVert, m_LastQuadCenter, m_LastQuadForward, m_LastQuadRight);
earliestChangedQuad = Mathf.Min(earliestChangedQuad, iMidQuadIndex);
// Fuse back to mid if it exists and if they used to be fused.
if (iStripLength > 2 && m_LastSegmentLengthSolids > 1)
{
FuseQuads(aVerts, aNorms, iBackQuadVert, iMidQuadVert, bGenerateNew);
if (m_EnableBackfaces)
{
MakeConsistentBacksideQuad(aVerts, aNorms, iBackQuadVert);
}
}
else if (bGenerateNew && m_LastSegmentLengthSolids == 1)
{
// If we've got a strip longer than one quad, and this segment is only one quad, it
// means this is the start of a new segment. If we're beginning a new segment and
// our previous segment is only one quad, squash that quad to clean up artifacts.
PositionQuad(aVerts, iMidQuadVert, m_LastQuadCenter, Vector3.zero, Vector3.zero);
}
if (m_EnableBackfaces)
{
MakeConsistentBacksideQuad(aVerts, aNorms, iMidQuadVert);
}
}
else if (iSegmentLength == 2)
{
// If we've got a long strip, but this segment is only 2 quads, just fuse.
FuseQuads(aVerts, aNorms, iMidQuadVert, iFrontQuadVert, bGenerateNew);
if (m_EnableBackfaces)
{
MakeConsistentBacksideQuad(aVerts, aNorms, iMidQuadVert);
MakeConsistentBacksideQuad(aVerts, aNorms, iFrontQuadVert);
}
}
else
{
// Set mid quad to the midpoint of back and front quads.
for (int i = 0; i < 6; ++i)
{
aVerts[iMidQuadVert + i] = (aVerts[iBackQuadVert + i] + aVerts[iFrontQuadVert + i]) * 0.5f;
}
// Patch up the holes by connecting the leading edge of the back quad to the trailing
// edge of the mid, and do the same from mid to front.
FuseQuads(aVerts, aNorms, iBackQuadVert, iMidQuadVert, bGenerateNew);
FuseQuads(aVerts, aNorms, iMidQuadVert, iFrontQuadVert, bGenerateNew);
if (m_EnableBackfaces)
{
MakeConsistentBacksideQuad(aVerts, aNorms, iBackQuadVert);
MakeConsistentBacksideQuad(aVerts, aNorms, iMidQuadVert);
MakeConsistentBacksideQuad(aVerts, aNorms, iFrontQuadVert);
}
// Make sure the UVs are proper
UpdateUVsForQuad(iMidQuadIndex);
}
}
}
/// Returns true on success, false on failure.
/// Failure cases are guaranteed to be identical to the failure cases of RawValueToColor
/// Use if converting raw -> Color is lossy; otherwise, use RawValueToColor
/// HDR color pickers might disallow conversion to HSL.
static bool RawValueToHSLColor(ColorPickerMode mode, Vector3 raw, out HSLColor color)
{
const float EPSILON = 1e-5f;
switch (mode)
{
case ColorPickerMode.SV_H_Rect:
color = HSLColor.FromHSV(raw.z * HSLColor.HUE_MAX, raw.x, raw.y);
return(true);
case ColorPickerMode.HS_L_Polar: {
var position = new Vector2(raw.x - 0.5f, raw.y - 0.5f) * 2;
var radius = position.magnitude;
color = new HSLColor();
if (radius > 1)
{
if (radius > 1 + EPSILON)
{
return(false);
}
else
{
radius = 1;
}
}
// x direction is 0 degrees (red)
color.HueDegrees = Mathf.Atan2(position.y, position.x) * Mathf.Rad2Deg;
color.s = radius;
color.l = raw.z;
color.a = 1;
return(true);
}
case ColorPickerMode.SL_H_Triangle: {
color.h = 0; // assigned later
color.l = raw.y;
float maxChroma = SQRT3 * ((color.l < .5f) ? color.l : (1 - color.l));
color.s = (maxChroma == 0) ? 0 : raw.x / maxChroma;
color.a = 1;
color.Hue01 = raw.z;
return(0 <= raw.x && raw.x <= maxChroma);
}
case ColorPickerMode.HL_S_Polar: {
var position = new Vector2(raw.x - 0.5f, raw.y - 0.5f) * 2;
var radius = position.magnitude;
color = new HSLColor();
if (radius > 1)
{
if (radius > 1 + EPSILON)
{
return(false);
}
else
{
radius = 1;
}
}
color.HueDegrees = Mathf.Atan2(position.y, position.x) * Mathf.Rad2Deg;
color.l = 1 - radius;
color.s = 1 - raw.z;
color.a = 1;
return(true);
}
case ColorPickerMode.HS_LogV_Polar:
throw new InvalidOperationException("This is a HDR mode");
default:
Debug.Assert(false);
color = new HSLColor();
return(false);
}
}
/// Can never fail (unlike RawValueToColor)
///
/// Note: Behavior is currently undefined if an hdr color is passed in,
/// but the color picker cannot handle hdr.
public static Vector3 ColorToRawValue(ColorPickerMode mode, Color rgb)
{
bool colorIsHdr = (rgb.r > 1 || rgb.g > 1 || rgb.b > 1);
// If we do this a lot, maybe add this to ColorPickerInfo.hdr?
// Or better, refactor this whole mess of code into small mode-specific classes.
bool pickerSupportsHdr = (mode == ColorPickerMode.HS_LogV_Polar);
if (colorIsHdr && !pickerSupportsHdr)
{
// Shouldn't happen except in experimental
Debug.LogErrorFormat("Truncating HDR color to LDR");
float h, s, v;
Color.RGBToHSV(rgb, out h, out s, out v);
rgb = Color.HSVToRGB(h, s, v, hdr: false);
}
switch (mode)
{
case ColorPickerMode.SV_H_Rect: {
float h, s, v;
Color.RGBToHSV(rgb, out h, out s, out v);
return(new Vector3(s, v, h));
}
case ColorPickerMode.HS_L_Polar: {
// H is angle, S is radius, L is depth
HSLColor color = (HSLColor)rgb;
var angle = color.HueDegrees * Mathf.Deg2Rad;
var vector = new Vector2(Mathf.Cos(angle), Mathf.Sin(angle)) * color.s / 2 +
new Vector2(0.5f, 0.5f);
return(new Vector3(vector.x, vector.y, color.l));
}
case ColorPickerMode.HL_S_Polar: {
// H is angle, (1-L) is radius, (1-S) is depth
HSLColor color = (HSLColor)rgb;
var angle = color.HueDegrees * Mathf.Deg2Rad;
float radius = 1 - color.l;
var vector = new Vector2(Mathf.Cos(angle), Mathf.Sin(angle)) * radius / 2 +
new Vector2(0.5f, 0.5f);
return(new Vector3(vector.x, vector.y, 1 - color.s));
}
case ColorPickerMode.SL_H_Triangle: {
HSLColor color = (HSLColor)rgb;
Vector3 ret = new Vector3();
ret.y = color.l;
ret.z = color.Hue01;
float maxChroma = SQRT3 * ((color.l < .5f) ? color.l : (1 - color.l));
ret.x = maxChroma * color.s;
return(ret);
}
case ColorPickerMode.HS_LogV_Polar: {
// H is angle, S is radius, log(V) is depth
// This only needs to be > 0 and < the minimum ColorPickerMode.HS_LogV_Polar
float kMinValue = 1e-7f;
float h, s, v;
Color.RGBToHSV(rgb, out h, out s, out v);
Vector2 cartesian; {
float angle = h * (Mathf.PI * 2);
cartesian = new Vector2(Mathf.Cos(angle), Mathf.Sin(angle)) * s;
// convert from [-1, 1] to [0, 1]
cartesian = cartesian / 2 + new Vector2(.5f, .5f);
}
// Log-remap [2^-n, 2^n] to [-n, n]
v += MinHDRValue;
float slider = Mathf.Log(Mathf.Max(v, kMinValue), 2);
slider = Mathf.Clamp(slider, kLogVMin, sm_LogVMax);
// remap from [min, max] to [0, 1]
slider = (slider - kLogVMin) / (sm_LogVMax - kLogVMin);
return(new Vector3(cartesian.x, cartesian.y, slider));
}
default:
return(new Vector3(1, 1, 1));
}
}
