jracek/secretsplash
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

Added dithering option to textures

Browse Source
This commit is contained in:
jracek
2025-01-14 20:47:01 +01:00
parent 829176a25e
commit 3f238c619e
2 changed files with 61 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

53
Runtime/PSXTexture.cs
View File

@@ -44,6 +44,10 @@ namespace PSXSplash.RuntimeCode
Texture2D originalTexture = (Texture2D)texture;
Texture2D newTexture = ResizeTexture(originalTexture, Width, Height);
if (Dithering)
{
newTexture = DitherTexture(newTexture);
}
if (TextureType == PSXTextureType.TEX16_BPP)
{
ushort[] converted = ConvertTo16Bpp(newTexture);
@@ -138,6 +142,55 @@ namespace PSXSplash.RuntimeCode
return packedData;
}
public static Texture2D DitherTexture(Texture2D sourceTexture, float threshold = 0.2f, float errorDiffusionStrength = 0.1f)
{
int width = sourceTexture.width;
int height = sourceTexture.height;
Color[] pixels = sourceTexture.GetPixels();
Color[] ditheredPixels = new Color[pixels.Length];
for (int y = 0; y < height; y++)
{
for (int x = 0; x < width; x++)
{
int index = y * width + x;
Color pixel = pixels[index];
// Convert the pixel to grayscale
float gray = pixel.grayscale;
// Apply threshold to determine if it's black or white
int dithered = (gray > threshold) ? 1 : 0;
// Calculate the error as the difference between the grayscale value and the dithered result
float error = gray - dithered;
// Store the dithered pixel
ditheredPixels[index] = new Color(dithered, dithered, dithered);
// Spread the error to neighboring pixels with customizable error diffusion strength
if (x + 1 < width) pixels[(y * width) + (x + 1)] += new Color(error * 7f / 16f * errorDiffusionStrength, error * 7f / 16f * errorDiffusionStrength, error * 7f / 16f * errorDiffusionStrength);
if (y + 1 < height) pixels[((y + 1) * width) + x] += new Color(error * 3f / 16f * errorDiffusionStrength, error * 3f / 16f * errorDiffusionStrength, error * 3f / 16f * errorDiffusionStrength);
if (x - 1 >= 0 && y + 1 < height) pixels[((y + 1) * width) + (x - 1)] += new Color(error * 5f / 16f * errorDiffusionStrength, error * 5f / 16f * errorDiffusionStrength, error * 5f / 16f * errorDiffusionStrength);
if (x + 1 < width && y + 1 < height) pixels[((y + 1) * width) + (x + 1)] += new Color(error * 1f / 16f * errorDiffusionStrength, error * 1f / 16f * errorDiffusionStrength, error * 1f / 16f * errorDiffusionStrength);
}
}
// Clamp the final pixel values to ensure they are valid colors
for (int i = 0; i < pixels.Length; i++)
{
pixels[i].r = Mathf.Clamp01(pixels[i].r);
pixels[i].g = Mathf.Clamp01(pixels[i].g);
pixels[i].b = Mathf.Clamp01(pixels[i].b);
}
// Create the resulting dithered texture
Texture2D ditheredTexture = new Texture2D(width, height);
ditheredTexture.SetPixels(pixels);
ditheredTexture.Apply();
return ditheredTexture;
}
}
}