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ios/include/backend/TargetBufferInfo.h

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+/*
+ * Copyright (C) 2019 The Android Open Source Project
+ *
+ * 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.
+ */
+
+#ifndef TNT_FILAMENT_DRIVER_TARGETBUFFERINFO_H
+#define TNT_FILAMENT_DRIVER_TARGETBUFFERINFO_H
+
+#include <backend/DriverEnums.h>
+#include <backend/Handle.h>
+
+#include <stdint.h>
+
+namespace filament {
+namespace backend {
+
+//! \privatesection
+
+class TargetBufferInfo {
+public:
+    // ctor for 2D textures
+    TargetBufferInfo(Handle<HwTexture> h, uint8_t level = 0) noexcept // NOLINT(google-explicit-constructor)
+            : handle(h), level(level) { }
+    // ctor for cubemaps
+    TargetBufferInfo(Handle<HwTexture> h, uint8_t level, TextureCubemapFace face) noexcept
+            : handle(h), level(level), face(face) { }
+    // ctor for 3D textures
+    TargetBufferInfo(Handle<HwTexture> h, uint8_t level, uint16_t layer) noexcept
+            : handle(h), level(level), layer(layer) { }
+
+    explicit TargetBufferInfo(TextureCubemapFace face) noexcept : face(face) {}
+
+    explicit TargetBufferInfo(uint16_t layer) noexcept : layer(layer) {}
+
+    // texture to be used as render target
+    Handle<HwTexture> handle;
+    // level to be used
+    uint8_t level = 0;
+    union {
+        // face if texture is a cubemap
+        TextureCubemapFace face;
+        // for 3D textures
+        uint16_t layer = 0;
+    };
+    TargetBufferInfo() noexcept { }
+};
+
+class MRT {
+public:
+    static constexpr uint8_t MIN_SUPPORTED_RENDER_TARGET_COUNT = 4u;
+
+    // When updating this, make sure to also take care of RenderTarget.java
+    static constexpr uint8_t MAX_SUPPORTED_RENDER_TARGET_COUNT = 8u;
+
+private:
+    TargetBufferInfo mInfos[MAX_SUPPORTED_RENDER_TARGET_COUNT];
+
+public:
+    TargetBufferInfo const& operator[](size_t i) const noexcept {
+        return mInfos[i];
+    }
+
+    TargetBufferInfo& operator[](size_t i) noexcept {
+        return mInfos[i];
+    }
+
+    MRT() noexcept = default;
+
+    MRT(TargetBufferInfo const& color) noexcept // NOLINT(hicpp-explicit-conversions)
+            : mInfos{ color } {
+    }
+
+    MRT(TargetBufferInfo const& color0, TargetBufferInfo const& color1) noexcept
+            : mInfos{ color0, color1 } {
+    }
+
+    MRT(TargetBufferInfo const& color0, TargetBufferInfo const& color1,
+        TargetBufferInfo const& color2) noexcept
+            : mInfos{ color0, color1, color2 } {
+    }
+
+    MRT(TargetBufferInfo const& color0, TargetBufferInfo const& color1,
+        TargetBufferInfo const& color2, TargetBufferInfo const& color3) noexcept
+            : mInfos{ color0, color1, color2, color3 } {
+    }
+
+    // this is here for backward compatibility
+    MRT(Handle<HwTexture> h, uint8_t level, uint16_t layer) noexcept
+            : mInfos{{ h, level, layer }} {
+    }
+};
+
+} // namespace backend
+} // namespace filament
+
+#endif //TNT_FILAMENT_DRIVER_TARGETBUFFERINFO_H