Fix GL errors due to disposed textures still being bound after rendering multiple projectors at once.

Author: fnuecke

src/main/java/li/cil/oc2/client/renderer/ModShaders.java

@@ -37,6 +37,7 @@ public static ShaderInstance getProjectorsShader() {
         return projectorsShader;
     }
 
+    @SuppressWarnings("ConstantConditions") // Setting samples to null to clear them is fine.
     public static void configureProjectorsShader(
         final RenderTarget target,
         final Matrix4f inverseCameraMatrix,
@@ -51,10 +52,15 @@ public static void configureProjectorsShader(
         projectorsShader.setSampler("MainCameraDepth", target.getDepthTextureId());
         projectorsShader.safeGetUniform("InverseMainCamera").set(inverseCameraMatrix);
 
-        for (int i = 0; i < projectorCount; i++) {
-            projectorsShader.setSampler(PROJECTOR_COLOR_NAMES[i], colors[i].getId());
-            projectorsShader.setSampler(PROJECTOR_DEPTH_NAMES[i], depths[i].getDepthTextureId());
-            projectorsShader.safeGetUniform(PROJECTOR_CAMERA_NAMES[i]).set(projectorCameraMatrices[i]);
+        for (int i = 0; i < MAX_PROJECTORS; i++) {
+            if (i < projectorCount) {
+                projectorsShader.setSampler(PROJECTOR_COLOR_NAMES[i], colors[i].getId());
+                projectorsShader.setSampler(PROJECTOR_DEPTH_NAMES[i], depths[i].getDepthTextureId());
+                projectorsShader.safeGetUniform(PROJECTOR_CAMERA_NAMES[i]).set(projectorCameraMatrices[i]);
+            } else {
+                projectorsShader.setSampler(PROJECTOR_COLOR_NAMES[i], null);
+                projectorsShader.setSampler(PROJECTOR_DEPTH_NAMES[i], null);
+            }
         }
     }
 

src/main/java/li/cil/oc2/client/renderer/ProjectorDepthRenderer.java

@@ -48,6 +48,7 @@
 
 import java.time.Duration;
 import java.util.ArrayList;
+import java.util.Arrays;
 import java.util.List;
 import java.util.concurrent.ExecutionException;
 
@@ -181,6 +182,7 @@ public static void handleRenderLevelLast(final RenderLevelLastEvent event) {
             renderProjectorColors(minecraft, event.getPoseStack().last().pose(), event.getProjectionMatrix(), projectorCount);
         } finally {
             VISIBLE_PROJECTORS.clear();
+            Arrays.fill(PROJECTOR_COLOR_TARGETS, null);
         }
     }