Add CB Render Texture input to preserve transparency

Author: jasonm-unity

source/FrameRecorder/Inputs/CBRenderTexture/Editor/CBRenderTextureInputSettingsEditor.cs

@@ -14,6 +14,7 @@ public class CBRenderTextureInputSettingsEditor : Editor
         SerializedProperty m_RenderSize;
         SerializedProperty m_RenderAspect;
         SerializedProperty m_FlipVertically;
+        SerializedProperty m_Transparency;
 
         protected void OnEnable()
         {
@@ -26,6 +27,7 @@ protected void OnEnable()
             m_RenderSize = pf.Find(w => w.m_RenderSize);
             m_RenderAspect = pf.Find(w => w.m_RenderAspect);
             m_FlipVertically = pf.Find(w => w.m_FlipVertical);
+            m_Transparency = pf.Find(w => w.m_AllowTransparency);
         }
 
         public override void OnInspectorGUI()
@@ -58,7 +60,8 @@ public override void OnInspectorGUI()
                 }
             }
 
-            EditorGUILayout.PropertyField(m_FlipVertically, new GUIContent("Flip image vertically"));
+            EditorGUILayout.PropertyField(m_Transparency, new GUIContent("Preserve transparency"));
+            EditorGUILayout.PropertyField(m_FlipVertically, new GUIContent("Flip vertically"));
 
             serializedObject.ApplyModifiedProperties();
 

source/FrameRecorder/Inputs/CBRenderTexture/Engine/CBRenderTextureInput.cs

@@ -175,6 +175,9 @@ public override void NewFrameStarting(RecordingSession session)
                 if (m_Camera.targetTexture != null || cbSettings.m_FlipVertical )
                     m_mat_copy.EnableKeyword("OFFSCREEN");
 
+                if( cbSettings.m_AllowTransparency )
+                    m_mat_copy.EnableKeyword("TRANSPARENCY_ON");
+
                 var tid = Shader.PropertyToID("_TmpFrameBuffer");
                 m_cbCopyFB = new CommandBuffer { name = "Frame Recorder: copy frame buffer" };
                 m_cbCopyFB.GetTemporaryRT(tid, -1, -1, 0, FilterMode.Bilinear);

source/FrameRecorder/Inputs/CBRenderTexture/Engine/CBRenderTextureInputSettings.cs

@@ -8,6 +8,7 @@ public class CBRenderTextureInputSettings : InputSettings<CBRenderTextureInput>
         public string m_CameraTag;
         public bool m_FlipVertical = false;
         public bool m_PadSize = false;
+        public bool m_AllowTransparency = false;
 
         public override bool isValid {
             get { return source != EImageSource.TaggedCamera || !string.IsNullOrEmpty(m_CameraTag); }

source/FrameRecorder/Inputs/CBRenderTexture/Shaders/CopyFrameBuffer.shader

@@ -50,7 +50,9 @@ half4 copy_framebuffer(v2f I) : SV_Target
     t.y = 1.0 - t.y;
 #endif
     half4 O = tex2D(_TmpFrameBuffer, t);
+#if !defined(TRANSPARENCY_ON)
     O.a = 1.0;
+#endif
     return O;
 }