From 307d818993123841ad4adebd0633ed4440365b89 Mon Sep 17 00:00:00 2001
From: dscyrescotti <dscyrescotti@gmail.com>
Date: Thu, 27 Jun 2024 11:24:26 +0700
Subject: [PATCH] feat: exclude graphic texture if there is no elements in
 visible frame of canvas

---
 Memola/Canvas/Core/Renderer.swift                   |  1 +
 Memola/Canvas/RenderPasses/ViewPortRenderPass.swift | 13 +++++++++----
 2 files changed, 10 insertions(+), 4 deletions(-)

diff --git a/Memola/Canvas/Core/Renderer.swift b/Memola/Canvas/Core/Renderer.swift
index 161f0d7..0f143f3 100644
--- a/Memola/Canvas/Core/Renderer.swift
+++ b/Memola/Canvas/Core/Renderer.swift
@@ -101,6 +101,7 @@ final class Renderer {
 
         viewPortRenderPass.descriptor = view.currentRenderPassDescriptor
         viewPortRenderPass.excludesPhotoBackground = photoBackgroundRenderPass.clearsTexture
+        viewPortRenderPass.excludesGraphic = cacheRenderPass.clearsTexture
         viewPortRenderPass.photoBackgroundTexture = photoBackgroundRenderPass.photoBackgroundTexture
         viewPortRenderPass.cacheTexture = cacheRenderPass.cacheTexture
         viewPortRenderPass.draw(into: commandBuffer, on: canvas, with: self)
diff --git a/Memola/Canvas/RenderPasses/ViewPortRenderPass.swift b/Memola/Canvas/RenderPasses/ViewPortRenderPass.swift
index dd4f79a..d939bb1 100644
--- a/Memola/Canvas/RenderPasses/ViewPortRenderPass.swift
+++ b/Memola/Canvas/RenderPasses/ViewPortRenderPass.swift
@@ -22,6 +22,7 @@ class ViewPortRenderPass: RenderPass {
 
     weak var view: MTKView?
 
+    var excludesGraphic: Bool = false
     var excludesPhotoBackground: Bool = false
 
     init(renderer: Renderer) {
@@ -68,8 +69,10 @@ class ViewPortRenderPass: RenderPass {
                 canvas.renderViewPortUpdate(device: renderer.device, renderEncoder: renderEncoder)
             }
 
-            renderEncoder.setFragmentTexture(cacheTexture, index: 0)
-            canvas.renderViewPortUpdate(device: renderer.device, renderEncoder: renderEncoder)
+            if !excludesGraphic {
+                renderEncoder.setFragmentTexture(cacheTexture, index: 0)
+                canvas.renderViewPortUpdate(device: renderer.device, renderEncoder: renderEncoder)
+            }
         } else {
             guard let viewPortPipelineState else {
                 return false
@@ -82,8 +85,10 @@ class ViewPortRenderPass: RenderPass {
                 canvas.renderViewPort(device: renderer.device, renderEncoder: renderEncoder)
             }
 
-            renderEncoder.setFragmentTexture(cacheTexture, index: 0)
-            canvas.renderViewPort(device: renderer.device, renderEncoder: renderEncoder)
+            if !excludesGraphic {
+                renderEncoder.setFragmentTexture(cacheTexture, index: 0)
+                canvas.renderViewPort(device: renderer.device, renderEncoder: renderEncoder)
+            }
         }
 
         renderEncoder.endEncoding()