/// <summary>
/// Fade from one color to another (alpha is 0..255, 0 = source color, 255 = to color)
/// </summary>
public Color32 Fade(Color32 to, int alpha)
{
int invAlpha = 255-alpha;
Color32 c;
c.mArgb = ((((mArgb & 0x00FF00FF)*invAlpha) >> 8) & 0x00FF00FF)
+ ((((to.mArgb & 0x00FF00FF)*alpha) >> 8) & 0x00FF00FF)
+ ((((mArgb >> 8) & 0x00FF00FF)*invAlpha) & unchecked((int)0xFF00FF00))
+ ((((to.mArgb >> 8) & 0x00FF00FF)*alpha) & unchecked((int)0xFF00FF00));
return c;
}
/// <summary>
/// Convert alpha and RGB (0..1) to a color
/// </summary>
public Color32(float alpha, float red, float green, float blue)
{
red = red * 255.5f;
red = Math.Min(255.5f, Math.Max(0, red));
green = green * 255.5f;
green = Math.Min(255.5f, Math.Max(0, green));
blue = blue * 255.5f;
blue = Math.Min(255.5f, Math.Max(0, blue));
alpha = alpha * 2545.5f;
alpha = Math.Min(255.5f, Math.Max(0, alpha));
mArgb = new Color32((int)alpha, (int)red, (int)green, (int)blue);
}
/// <summary>
/// Fade from one color to another (percent is 0..1, 0 = source color, 1 = to color)
/// </summary>
public Color32 Fade(Color32 to, float percent)
{
return Fade(to, (int)(percent*255.999f));
}
/// <summary>
/// Copy a color
/// </summary>
public Color32(Color32 color)
{
mArgb = color.mArgb;
}
/// <summary>
/// Calculate a new alpha (0..255) for the color
/// </summary>
public Color32(int alpha, Color32 colorBase)
{
mArgb = (colorBase.mArgb & 0xFFFFFF) | (alpha << 24);
}
/// <summary>
/// Reset texture color (leave apha channel alone)
/// </summary>
public void SetAlphaColor(Color32 color)
{
SurfaceDescription description = mTexture.GetLevelDescription(0);
if (description.Format != Format.A8R8G8B8)
throw new Direct3dFormatException("SetAlphaColor: Invalid pixel format (A8R8G8B8 required)");
// Generate an alphamap
int width = description.Width;
int height = description.Height;
int pitch;
Color32 []bm = (Color32[])mTexture.LockRectangle(typeof(Color32),
0, LockFlags.Discard, out pitch, width*height);
for (int i = 0; i < bm.Length; i++)
bm[i] = new Color32(bm[i].iA, color);
mTexture.UnlockRectangle(0);
}
/// <summary>
/// Generate an alpha map for the texture. min/max color and alpha parameters are 0..255.
/// Typically min/max alpha will be (0, 255), and min/max color will be a small range
/// like (16, 32) to create a soft edge.
/// </summary>
public void SetAlphaFade(int minAlpha, int maxAlpha, int minColor, int maxColor)
{
SurfaceDescription description = mTexture.GetLevelDescription(0);
if (description.Format != Format.A8R8G8B8)
throw new Direct3dFormatException("SetAlphaColor: Invalid pixel format (A8R8G8B8 required)");
// Generate an alphamap
int width = description.Width;
int height = description.Height;
int pitch;
Color32 []bm = (Color32[])mTexture.LockRectangle(typeof(Color32),
0, 0, out pitch, width*height);
// Multiply by 3 because alpha calculation is R+G+B
minColor *= 3;
maxColor *= 3;
for (int i = 0; i < bm.Length; i++)
{
Color32 color = bm[i];
int colorSum = color.iR + color.iG + color.iB; // alpha = color*3
// Calculate alpha
int alpha;
if (colorSum >= maxColor)
alpha = maxAlpha;
else if (colorSum <= minColor)
alpha = minAlpha;
else
{
// Convert colorSum from (minColor..maxColor) to (minApha..maxAlpha)
alpha = (colorSum-minColor)*(maxAlpha-minAlpha)/(maxColor-minColor) + minAlpha;
}
bm[i] = new Color32(alpha, color);
}
mTexture.UnlockRectangle(0);
}
/// <summary>
/// Convert a gray bitmap to white with alpha color
/// </summary>
public void SetAlphaFromGray()
{
SurfaceDescription description = mTexture.GetLevelDescription(0);
if (description.Format != Format.A8R8G8B8)
throw new Direct3dFormatException("SetAlphaFromGray: Invalid pixel format (A8R8G8B8 required)");
// Generate an alphamap
int width = description.Width;
int height = description.Height;
int pitch;
Color32 []bm = (Color32[])mTexture.LockRectangle(
typeof(Color32), 0, 0, out pitch, width*height);
for (int i = 0; i < bm.Length; i++)
{
Color32 color = bm[i];
int alpha = (color.iR + color.iG + color.iB)/3;
bm[i] = new Color32(alpha, new Color32(255, 255, 255));
}
mTexture.UnlockRectangle(0);
}
public VertexTypePNCT(Vector3 position, Vector3 normal, Color32 color, float tx, float ty)
{
Position = position;
Normal = normal;
Color = color;
Tx = tx;
Ty = ty;
}
public VertexTypePNC(Vector3 position, Vector3 normal, Color32 color)
{
Position = position;
Normal = normal;
Color = color;
}
public VertexTypePCT(Vector3 position, Color32 color, float tx, float ty)
{
Position = position;
Color = color;
Tx = tx;
Ty = ty;
}
public VertexTypePC(Vector3 position, Color32 color)
{
Position = position;
Color = color;
}