Skip glass and blur work that draws nothing

Before 1.21.6 the game is only saved for glass when glass can be drawn,
and a background blur of 0 no longer runs the blur. Every version frees
the copies (and from 1.21.6 the blurs) of glass strengths no longer set,
instead of keeping one per strength ever used.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

src/main/java/org/saturnclient/impl/ui/GlassRenderer.java

@@ -28,6 +28,7 @@ import com.mojang.blaze3d.textures.FilterMode;
 import com.mojang.blaze3d.textures.GpuTextureView;
 import com.mojang.serialization.JsonOps;
 
+import org.saturnclient.config.Config;
 import org.saturnclient.saturnclient.SaturnClient;
 
 import net.minecraft.client.gl.Framebuffer;
@@ -86,6 +87,7 @@ public final class GlassRenderer {
             processor.render(backdrop, POOL);
         }
         POOL.decrementLifespan();
+        release(blur);
     }
 
     // The mask, then the copy blurred by blur, as the glass pipeline samples them
@@ -97,6 +99,28 @@ public final class GlassRenderer {
         //return TextureSetup.of(mask.getGlTextureView(), backdrop);
     }
 
+    // Frees the copies and blurs of strengths that are no longer set, besides kept
+    private static void release(int kept) {
+        BACKDROPS.entrySet().removeIf(entry -> {
+            boolean unused = entry.getKey() != kept && !isSet(entry.getKey());
+            if (unused) {
+                entry.getValue().delete();
+            }
+            return unused;
+        });
+        BLURS.entrySet().removeIf(entry -> {
+            boolean unused = entry.getKey() != kept && !isSet(entry.getKey());
+            if (unused && entry.getValue() != null) {
+                entry.getValue().close();
+            }
+            return unused;
+        });
+    }
+
+    private static boolean isSet(int blur) {
+        return blur == Config.menuBlur.value || blur == Config.widgetBlur.value;
+    }
+
     private static PostEffectProcessor getBlur(int blur) {
         if (!BLURS.containsKey(blur)) {
             BLURS.put(blur, loadBlur(blur));
@@ -141,6 +165,7 @@ import com.mojang.blaze3d.pipeline.RenderPipeline;
 import com.mojang.blaze3d.systems.RenderSystem;
 import com.mojang.blaze3d.textures.FilterMode;
 
+import org.saturnclient.config.Config;
 import org.saturnclient.saturnclient.SaturnClient;
 
 import net.minecraft.client.gl.Framebuffer;
@@ -191,6 +216,7 @@ public final class GlassRenderer {
             processor.render(backdrop, POOL, pass -> pass.setUniform("Radius", (float) blur));
         }
         POOL.decrementLifespan();
+        release(blur);
     }
 
     // Draws glass through mask with the copy blurred by blur
@@ -206,6 +232,18 @@ public final class GlassRenderer {
                         .build(false)));
     }
 
+    // Frees the copies of strengths that are no longer set, besides kept
+    private static void release(int kept) {
+        BACKDROPS.entrySet().removeIf(entry -> {
+            boolean unused = entry.getKey() != kept && entry.getKey() != Config.menuBlur.value
+                    && entry.getKey() != Config.widgetBlur.value;
+            if (unused) {
+                entry.getValue().delete();
+            }
+            return unused;
+        });
+    }
+
     // Copies from into to, made or resized to match
     private static SimpleFramebuffer copy(Framebuffer from, SimpleFramebuffer to, String name) {
         int width = from.textureWidth;
@@ -233,6 +271,7 @@ import org.lwjgl.opengl.GL30;
 import com.mojang.blaze3d.platform.GlStateManager;
 import com.mojang.blaze3d.systems.RenderSystem;
 
+import org.saturnclient.config.Config;
 import org.saturnclient.saturnclient.SaturnClient;
 
 import net.minecraft.client.gl.Defines;
@@ -284,6 +323,7 @@ public final class GlassRenderer {
             processor.render(backdrop, POOL);
         }
         POOL.decrementLifespan();
+        release(blur);
         SaturnClient.client.getFramebuffer().beginWrite(false);
     }
 
@@ -302,6 +342,18 @@ public final class GlassRenderer {
                         .build(false)));
     }
 
+    // Frees the copies of strengths that are no longer set, besides kept
+    private static void release(int kept) {
+        BACKDROPS.entrySet().removeIf(entry -> {
+            boolean unused = entry.getKey() != kept && entry.getKey() != Config.menuBlur.value
+                    && entry.getKey() != Config.widgetBlur.value;
+            if (unused) {
+                entry.getValue().delete();
+            }
+            return unused;
+        });
+    }
+
     // Copies from into to, made or resized to match
     private static SimpleFramebuffer copy(Framebuffer from, SimpleFramebuffer to) {
         int width = from.textureWidth;

src/main/java/org/saturnclient/impl/ui/SaturnScreenFabric.java

@@ -3,6 +3,7 @@ package org.saturnclient.impl.ui;
 import java.time.Duration;
 import java.time.Instant;
 
+import org.saturnclient.config.Config;
 import org.saturnclient.ui.RenderScope;
 import org.saturnclient.ui.SaturnScreen;
 import org.saturnclient.ui.SaturnScreen.ScreenProvider;
@@ -98,15 +99,17 @@ public class SaturnScreenFabric extends Screen implements ScreenProvider {
         }
 
         // Glass is blurred from the game as it is before this screen blurs it.
-        context.draw();
-        GlassRenderer.saveBackground();
+        if (Config.usesGlass()) {
+            context.draw();
+            GlassRenderer.saveBackground();
+        }
 
-        PostEffectProcessor postEffectProcessor = this.client.getShaderLoader().loadPostEffect(
+        float radius = screen.getBackgroundBlur();
+        PostEffectProcessor postEffectProcessor = radius < 1 ? null : this.client.getShaderLoader().loadPostEffect(
                 Identifier.ofVanilla("blur"),
                 DefaultFramebufferSet.MAIN_ONLY);
 
         if (postEffectProcessor != null) {
-            float radius = screen.getBackgroundBlur();
             //? if >=1.21.5
             postEffectProcessor.render(this.client.getFramebuffer(), this.pool, pass -> pass.setUniform("Radius", radius));
             //? if <1.21.5