Do not let pixi modify texture pixel alphas...

Author: badlogic

spine-ts/spine-pixi/example/darktint.html

@@ -29,8 +29,8 @@
 
       document.body.appendChild(app.view);
 
-      // const orange = "-pma";
-      const orange = "";
+      const orange = "-pma";
+      // const orange = "";
       PIXI.Assets.add("spineboyData", `./assets/orange${orange}.json`);
       PIXI.Assets.add("spineboyAtlas", `./assets/orange${orange}.atlas`);
       await PIXI.Assets.load(["spineboyData", "spineboyAtlas"]);

spine-ts/spine-pixi/src/assets/atlasLoader.ts

@@ -109,7 +109,7 @@ const spineTextureAtlasLoader: AssetExtension<RawAtlas | TextureAtlas, ISpineAtl
 					page.setTexture(SpineTexture.from(providedPage));
 				} else {
 					const url: string = providedPage ?? utils.path.normalize([...basePath.split(utils.path.sep), pageName].join(utils.path.sep));
-					const assetsToLoadIn = { src: url, data: { ...metadata.imageMetadata, ...{ alphaMode: page.pma ? ALPHA_MODES.PMA : ALPHA_MODES.UNPACK } } };
+					const assetsToLoadIn = { src: url, data: { ...metadata.imageMetadata, ...{ alphaMode: ALPHA_MODES.NPM } } };
 					const pixiPromise = loader.load<Texture>(assetsToLoadIn)
 						.then((texture) => {
 							page.setTexture(SpineTexture.from(texture.baseTexture));

spine-ts/spine-pixi/src/darkTintMesh/DarkTintRenderer.ts

@@ -70,7 +70,7 @@ void main(void){
 
 
     gl_FragColor.a = color.a * vColor.a;
-    gl_FragColor.rgb = ((color.a - 1.0) * vDarkColor.a + 1.0 - color.rgb) * vDarkColor.rgb * gl_FragColor.a + color.rgb * vColor.rgb;
+    gl_FragColor.rgb = ((color.a - 1.0) * vDarkColor.a + 1.0 - color.rgb) * vDarkColor.rgb + color.rgb * vColor.rgb;
 }
 `;
 
@@ -96,9 +96,12 @@ export class DarkTintRenderer extends BatchRenderer {
 		const vertexData = element.vertexData;
 		const textureId = element._texture.baseTexture._batchLocation;
 		const alpha = Math.min(element.worldAlpha, 1.0);
-		const argb = Color.shared.setValue(element._tintRGB).toPremultiplied(alpha, (element._texture.baseTexture.alphaMode ?? 0) > 0);
+		const alphaInt = Math.round(alpha * 255) & 0xFF;
+		const tintRGB = element._tintRGB & 0xFFFFFF;
+		const argb = (alphaInt << 24) | tintRGB;
 		const darkargb = element._darkTintRGB;
 
+
 		// lets not worry about tint! for now..
 		for (let i = 0; i < vertexData.length; i += 2) {
 			float32View[aIndex++] = vertexData[i];