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2025-09-04 10:54:47 +08:00
commit 6bc8f61b18
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+/* Copyright (c) 2025, Sascha Willems
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Licensed under the Apache License, Version 2.0 the "License";
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+[[vk::input_attachment_index(0)]] SubpassInput positionDepthAttachment;
+[[vk::input_attachment_index(1)]] SubpassInput normalAttachment;
+[[vk::input_attachment_index(2)]] SubpassInput albedoAttachment;
+
+struct VSOutput
+{
+    float4 Pos : SV_POSITION;
+    float2 UV;
+};
+
+struct Light
+{
+	float4 position;
+	float3 color;
+	float radius;
+};
+// Binding 0 : Position storage buffer
+StructuredBuffer<Light> lights;
+
+[shader("fragment")]
+float4 main(VSOutput input) 
+{
+	// Read G-Buffer values from previous sub pass
+    float3 fragPos = positionDepthAttachment.SubpassLoad().rgb;
+    float3 normal = normalAttachment.SubpassLoad().rgb;
+    float4 albedo = albedoAttachment.SubpassLoad();
+
+	#define ambient 0.005
+
+    // Ambient part
+    float3 fragcolor = albedo.rgb * ambient;
+
+    uint lightsLength;
+    uint lightsStride;
+    lights.GetDimensions(lightsLength, lightsStride);
+	
+	for(int i = 0; i < lightsLength; ++i)
+    {
+        float3 L = lights[i].position.xyz - fragPos;
+		float dist = length(L);
+
+		float attenuation = lights[i].radius / (pow(dist, 8.0) + 1.0);
+
+        float NdotL = max(0.0, dot(normalize(normal), normalize(L)));
+        float3 diffuse = lights[i].color * albedo.rgb * NdotL * attenuation;
+
+		fragcolor += diffuse;
+	}
+
+    return float4(fragcolor, 1.0);
+}