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2025-09-04 10:54:47 +08:00
commit 6bc8f61b18
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+/* Copyright (c) 2024, 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.
+ */
+
+#define HASHSCALE3 float3(443.897, 441.423, 437.195)
+#define STARFREQUENCY 0.01
+
+// Hash function by Dave Hoskins (https://www.shadertoy.com/view/4djSRW)
+float hash33(float3 p3)
+{
+    p3 = frac(p3 * HASHSCALE3);
+    p3 += dot(p3, p3.yxz + float3(19.19, 19.19, 19.19));
+    return frac((p3.x + p3.y) * p3.z + (p3.x + p3.z) * p3.y + (p3.y + p3.z) * p3.x);
+}
+
+float3 starField(float3 pos)
+{
+    float3 color = float3(0.0, 0.0, 0.0);
+    float threshhold = (1.0 - STARFREQUENCY);
+    float rnd = hash33(pos);
+    if (rnd >= threshhold)
+    {
+        float starCol = pow((rnd - threshhold) / (1.0 - threshhold), 16.0);
+        color += starCol.xxx;
+    }
+    return color;
+}
+
+float4 main([[vk::location(0)]] float3 inUVW : TEXCOORD0) : SV_TARGET
+{
+    return float4(starField(inUVW), 1.0);
+}