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shaders/descriptor_indexing/hlsl/update-after-bind-quads.frag.hlsl

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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.
+ */
+
+struct VSOutput
+{
+    float4 Pos : SV_POSITION;
+    [[vk::location(0)]] float2 UV : TEXCOORD0;
+};
+
+[[vk::binding(0, 0)]]
+Texture2D Textures[] : register(t0, space0);
+[[vk::binding(0, 1)]]
+SamplerState ImmutableSampler : register(s0, space1);
+
+struct Registers
+{
+    [[vk::offset(4)]] uint table_offset;
+};
+[[vk::push_constant]] Registers registers;
+
+float4 main(VSOutput input) : SV_TARGET0
+{
+    // This is a very common usage pattern for streamed descriptors with UPDATE_AFTER_BIND.
+    // We only need to update push constants, and our materials can access new descriptors.
+    // This avoids having to allocate and manage individual descriptor sets.
+    // It does mean that the chance to introduce bugs is higher however ...
+
+    // A push constant must be dynamically uniform over our draw call, so we do not have to do anything here.
+    // This is simply considered dynamic indexing, which is a feature in core Vulkan 1.0.
+    return Textures[registers.table_offset].Sample(ImmutableSampler, input.UV);
+}