Added support for the alpha component to the SSR post-process (#8542)

dist/preview release/what's new.md

@@ -31,6 +31,7 @@
 - Don't log a message in `CustomProceduralTexture` if the `texturePath` is not a JSON path ([Popov72](https://github.com/Popov72))
 - Added an alternate option to the mesh edge renderer to generate edges faster / more accurately for unusual geometries (like the ones generated by CSG) ([Popov72](https://github.com/Popov72))
 - Added an option when creating the engine to switch matrix computation to 64 bits ([Popov72](https://github.com/Popov72))
+- Added support for the alpha component to the SSR post-process ([Popov72](https://github.com/Popov72))
 
 ### Engine
 

src/Shaders/screenSpaceReflection.fragment.fx

@@ -126,10 +126,11 @@ void main()
 {
     #ifdef SSR_SUPPORTED
         // Intensity
-        vec3 albedo = texture2D(textureSampler, vUV).rgb;
+        vec4 albedoFull = texture2D(textureSampler, vUV);
+        vec3 albedo = albedoFull.rgb;
         float spec = texture2D(reflectivitySampler, vUV).r;
         if (spec == 0.0) {
-            gl_FragColor = vec4(albedo, 1.0);
+            gl_FragColor = albedoFull;
             return;
         }
         
@@ -157,7 +158,7 @@ void main()
         float albedoMultiplier = 1.0 - reflectionMultiplier;
         vec3 SSR = info.color * fresnel;
 
-        gl_FragColor = vec4((albedo * albedoMultiplier) + (SSR * reflectionMultiplier), 1.0);
+        gl_FragColor = vec4((albedo * albedoMultiplier) + (SSR * reflectionMultiplier), albedoFull.a);
     #else
         gl_FragColor = texture2D(textureSampler, vUV);
     #endif