public static void SetupPaintColorMask(this SCNGeometry geometry, string name)
{
// if we've already set it up, don't do it again
if (geometry.ValueForKey(new NSString(PaintMaskColorKey)) == null)
{
if (PaintColorMaskTextures.TryGetValue(name, out string paintMask))
{
// all textures are absolute paths from the app folder
var texturePath = $"art.scnassets/textures/{paintMask}.ktx";
if (name.Contains("catapult"))
{
//os_log(.debug, "visited %s for texture", name)
}
var surfaceScript = @"
#pragma arguments
texture2d<float> paintMaskTexture;
//sampler paintMaskSampler;
float4 paintMaskColor;
#pragma body
// 0 is use diffuse texture.rgb, 1 is use paintMaskColor.rgb
float paintMaskSelector = paintMaskTexture.sample(
sampler(filter::linear), // paintMaskSampler,
_surface.diffuseTexcoord.xy).r;
_surface.diffuse.rgb = mix(_surface.diffuse.rgb, paintMaskColor.rgb, paintMaskSelector);
";
geometry.ShaderModifiers = new SCNShaderModifiers()
{
EntryPointSurface = surfaceScript
};
// mask pro
var prop = SCNMaterialProperty.Create(new NSString(texturePath));
prop.MinificationFilter = SCNFilterMode.Linear;
prop.MagnificationFilter = SCNFilterMode.Nearest;
prop.MipFilter = SCNFilterMode.Nearest;
prop.MaxAnisotropy = 1;
// set the uniforms, these will be overridden in the runtime
geometry.SetTexture("paintMaskTexture", prop);
geometry.SetFloat4(PaintMaskColorKey, SCNVector4.One);
}
}
}
public static bool HasUniform(this SCNGeometry geometry, string uniform)
{
return(geometry.ValueForKey(new NSString(uniform)) != null);
}
