initial work to split into dart_filament and flutter_filament

dart_filament/native/include/filament/backend/TargetBufferInfo.h

@@ -0,0 +1,98 @@
+/*
+ * 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_BACKEND_TARGETBUFFERINFO_H
+#define TNT_FILAMENT_BACKEND_TARGETBUFFERINFO_H
+
+#include <backend/Handle.h>
+
+#include <utils/ostream.h>
+
+#include <stddef.h>
+#include <stdint.h>
+
+namespace filament::backend {
+
+//! \privatesection
+
+struct TargetBufferInfo {
+    // texture to be used as render target
+    Handle<HwTexture> handle;
+
+    // starting layer index for multiview. This value is only used when the `layerCount` for the
+    // render target is greater than 1.
+    uint8_t baseViewIndex = 0;
+
+    // level to be used
+    uint8_t level = 0;
+
+    // for cubemaps and 3D textures. See TextureCubemapFace for the face->layer mapping
+    uint16_t layer = 0;
+};
+
+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> handle, uint8_t level, uint16_t layer) noexcept
+            : mInfos{{ handle, 0, level, layer }} {
+    }
+};
+
+} // namespace filament::backend
+
+#if !defined(NDEBUG)
+utils::io::ostream& operator<<(utils::io::ostream& out, const filament::backend::TargetBufferInfo& tbi);
+utils::io::ostream& operator<<(utils::io::ostream& out, const filament::backend::MRT& mrt);
+#endif
+
+#endif //TNT_FILAMENT_BACKEND_TARGETBUFFERINFO_H