feat(light): DDA voxel shadow occlusion for point and area lights

common/src/main/java/foundry/veil/api/client/render/VeilRenderSystem.java

@@ -40,6 +40,7 @@
 import foundry.veil.impl.client.render.pipeline.VeilShaderBufferCache;
 import foundry.veil.impl.client.render.profiler.VeilRenderProfilerImpl;
 import foundry.veil.impl.client.render.shader.program.ShaderProgramImpl;
+import foundry.veil.impl.client.render.light.VoxelShadowGrid;
 import foundry.veil.mixin.pipeline.accessor.PipelineBufferSourceAccessor;
 import foundry.veil.platform.VeilEventPlatform;
 import net.minecraft.Util;
@@ -1241,6 +1242,7 @@ public static void close() {
         if (renderer != null) {
             renderer.free();
         }
+        VoxelShadowGrid.close();
         glDeleteVertexArrays(screenQuadVao);
         MemoryUtil.memFree(emptySamplers);
         SHADER_BUFFER_CACHE.free();
@@ -1277,6 +1279,8 @@ public static boolean drawLights(ProfilerFiller profiler, CullFrustum cullFrustu
             return false;
         }
 
+        VoxelShadowGrid.beforeRenderLights();
+
         VeilDebug debug = VeilDebug.get();
         debug.pushDebugGroup("Veil Draw Lights");
 
@@ -1322,5 +1326,6 @@ public static void compositeLights(ProfilerFiller profiler) {
     @ApiStatus.Internal
     public static void clearLevel() {
         NecromancerRenderDispatcher.delete();
+        VoxelShadowGrid.clearLevel();
     }
 }

common/src/main/java/foundry/veil/api/client/render/ext/VeilMultiBind.java

@@ -151,6 +151,11 @@ public void bindSamplers(int first, int... samplers) {
             .expireAfterAccess(10, TimeUnit.SECONDS)
             .build();
 
+    private static final Cache<Integer, Integer> TEXTURE_TARGET_CACHE = CacheBuilder.newBuilder()
+            .maximumSize(100)
+            .expireAfterAccess(10, TimeUnit.SECONDS)
+            .build();
+
     private static int getTarget(int texture) {
         Integer cached = TEXTURE_TARGET_CACHE.getIfPresent(texture);
         if (cached != null) {
@@ -238,4 +243,5 @@ public static VeilMultiBind get() {
         }
         return multiBind;
     }
+
 }

common/src/main/java/foundry/veil/api/client/render/light/data/AreaLightData.java

@@ -31,6 +31,7 @@ public class AreaLightData extends LightData implements InstancedLightData, Edit
 
     protected float angle;
     protected float distance;
+    protected boolean occluded;
 
     public AreaLightData() {
         this.matrix = new Matrix4d();
@@ -41,6 +42,16 @@ public AreaLightData() {
 
         this.angle = (float) Math.toRadians(45);
         this.distance = 1.0F;
+        this.occluded = false;
+    }
+
+    public boolean isOccluded() {
+        return this.occluded;
+    }
+
+    public AreaLightData setOccluded(boolean occluded) {
+        this.occluded = occluded;
+        return this;
     }
 
     protected void updateMatrix() {
@@ -163,6 +174,7 @@ public void store(ByteBuffer buffer) {
 
         buffer.putShort((short) Mth.clamp((int) (this.angle * MAX_ANGLE_SIZE), 0, 65535));
         buffer.putFloat(this.distance);
+        buffer.putFloat(this.occluded ? 1.0F : 0.0F);
     }
 
     @Override
@@ -201,6 +213,7 @@ public void renderImGuiAttributes() {
 
         float[] editAngle = new float[]{this.angle};
         float[] editDistance = new float[]{this.distance};
+        imgui.type.ImBoolean editOccluded = new imgui.type.ImBoolean(this.occluded);
 
         if (ImGui.dragFloat2("size", editSize, 0.02F, 0.0001F)) {
             this.setSize(editSize[0], editSize[1]);
@@ -250,5 +263,9 @@ public void renderImGuiAttributes() {
         if (ImGui.dragScalar("distance", editDistance, 0.02F, 0.0F)) {
             this.setDistance(editDistance[0]);
         }
+
+        if (ImGui.checkbox("Occluded", editOccluded)) {
+            this.occluded = editOccluded.get();
+        }
     }
 }

common/src/main/java/foundry/veil/api/client/render/light/data/PointLightData.java

@@ -23,10 +23,21 @@ public class PointLightData extends LightData implements IndirectLightData, Edit
 
     protected final Vector3d position;
     protected float radius;
+    protected boolean occluded;
 
     public PointLightData() {
         this.position = new Vector3d();
         this.radius = 1.0F;
+        this.occluded = false;
+    }
+
+    public boolean isOccluded() {
+        return this.occluded;
+    }
+
+    public PointLightData setOccluded(boolean occluded) {
+        this.occluded = occluded;
+        return this;
     }
 
     @Override
@@ -97,6 +108,7 @@ public void store(ByteBuffer buffer) {
         buffer.putFloat(this.color.green() * this.brightness);
         buffer.putFloat(this.color.blue() * this.brightness);
         buffer.putFloat(this.radius);
+        buffer.putFloat(this.occluded ? 1.0F : 0.0F);
     }
 
     @Override
@@ -118,6 +130,7 @@ public void renderImGuiAttributes() {
         double[] editZ = new double[]{this.position.z()};
 
         float[] editRadius = new float[]{this.radius};
+        imgui.type.ImBoolean editOccluded = new imgui.type.ImBoolean(this.occluded);
 
         float totalWidth = ImGui.calcItemWidth();
         ImGui.pushItemWidth(totalWidth / 3.0F - (ImGui.getStyle().getItemInnerSpacingX() * 0.58F));
@@ -140,5 +153,9 @@ public void renderImGuiAttributes() {
         if (ImGui.dragScalar("radius", editRadius, 0.02F, 0.0F)) {
             this.setRadius(editRadius[0]);
         }
+
+        if (ImGui.checkbox("Occluded", editOccluded)) {
+            this.occluded = editOccluded.get();
+        }
     }
 }

common/src/main/java/foundry/veil/impl/client/render/light/AreaLightRenderer.java

@@ -25,7 +25,7 @@ public class AreaLightRenderer extends InstancedLightRenderer<AreaLightData> {
     private static final ResourceLocation RENDER_TYPE = Veil.veilPath("light/area");
 
     public AreaLightRenderer() {
-        super(Float.BYTES * 22 + 2);
+        super(Float.BYTES * 23 + 2);
     }
 
     @Override
@@ -45,6 +45,7 @@ protected void setupBufferState(VertexArrayBuilder builder) {
         builder.setVertexAttribute(6, 2, 2, VertexArrayBuilder.DataType.FLOAT, false, Float.BYTES * 19); // size
         builder.setVertexAttribute(7, 2, 1, VertexArrayBuilder.DataType.UNSIGNED_SHORT, true, Float.BYTES * 21); // angle
         builder.setVertexAttribute(8, 2, 1, VertexArrayBuilder.DataType.FLOAT, false, Float.BYTES * 21 + 2); // distance
+        builder.setVertexAttribute(9, 2, 1, VertexArrayBuilder.DataType.FLOAT, false, Float.BYTES * 21 + 2 + Float.BYTES);
     }
 
     @Override

common/src/main/java/foundry/veil/impl/client/render/light/InstancedPointLightRenderer.java

@@ -25,7 +25,7 @@ public class InstancedPointLightRenderer extends InstancedLightRenderer<PointLig
     private static final ResourceLocation RENDER_TYPE = Veil.veilPath("light/point");
 
     public InstancedPointLightRenderer() {
-        super(Float.BYTES * 7);
+        super(Float.BYTES * 8);
     }
 
     @Override
@@ -40,6 +40,7 @@ protected void setupBufferState(VertexArrayBuilder builder) {
         builder.setVertexAttribute(1, 2, 3, VertexArrayBuilder.DataType.FLOAT, false, 0);
         builder.setVertexAttribute(2, 2, 3, VertexArrayBuilder.DataType.FLOAT, false, Float.BYTES * 3);
         builder.setVertexAttribute(3, 2, 1, VertexArrayBuilder.DataType.FLOAT, false, Float.BYTES * 6);
+        builder.setVertexAttribute(4, 2, 1, VertexArrayBuilder.DataType.FLOAT, false, Float.BYTES * 7);
     }
 
     @Override