116 lines
3.7 KiB
C++
116 lines
3.7 KiB
C++
// Copyright 2019 The MediaPipe Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#ifndef MEDIAPIPE_GPU_GL_TEXTURE_VIEW_H_
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#define MEDIAPIPE_GPU_GL_TEXTURE_VIEW_H_
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#include <functional>
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#include <memory>
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#include <utility>
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#include "mediapipe/gpu/gl_base.h"
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#include "mediapipe/gpu/gpu_buffer_storage.h"
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namespace mediapipe {
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class GlContext;
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class GlTextureView {
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public:
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GlTextureView() {}
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~GlTextureView() { Release(); }
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GlTextureView(const GlTextureView&) = delete;
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GlTextureView(GlTextureView&& other) { *this = std::move(other); }
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GlTextureView& operator=(const GlTextureView&) = delete;
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GlTextureView& operator=(GlTextureView&& other) {
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DoneWriting();
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if (detach_) detach_(*this);
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gl_context_ = other.gl_context_;
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target_ = other.target_;
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name_ = other.name_;
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width_ = other.width_;
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height_ = other.height_;
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plane_ = other.plane_;
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detach_ = std::exchange(other.detach_, nullptr);
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done_writing_ = std::exchange(other.done_writing_, nullptr);
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return *this;
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}
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GlContext* gl_context() const { return gl_context_; }
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int width() const { return width_; }
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int height() const { return height_; }
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GLenum target() const { return target_; }
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GLuint name() const { return name_; }
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int plane() const { return plane_; }
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using DetachFn = std::function<void(GlTextureView&)>;
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using DoneWritingFn = std::function<void(const GlTextureView&)>;
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private:
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friend class GlTextureBuffer;
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friend class GpuBufferStorageCvPixelBuffer;
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friend class GpuBufferStorageAhwb;
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GlTextureView(GlContext* context, GLenum target, GLuint name, int width,
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int height, int plane, DetachFn detach,
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DoneWritingFn done_writing)
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: gl_context_(context),
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target_(target),
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name_(name),
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width_(width),
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height_(height),
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plane_(plane),
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detach_(std::move(detach)),
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done_writing_(std::move(done_writing)) {}
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// TODO: remove this friend declaration.
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friend class GlTexture;
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void Release();
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// TODO: make this non-const.
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void DoneWriting() const;
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GlContext* gl_context_ = nullptr;
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GLenum target_ = GL_TEXTURE_2D;
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GLuint name_ = 0;
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// Note: when scale is not 1, we still give the nominal size of the image.
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int width_ = 0;
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int height_ = 0;
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int plane_ = 0;
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DetachFn detach_;
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mutable DoneWritingFn done_writing_;
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};
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namespace internal {
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template <>
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class ViewProvider<GlTextureView> {
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public:
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virtual ~ViewProvider() = default;
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// Note that the view type is encoded in an argument to allow overloading,
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// so a storage class can implement GetRead/WriteView for multiple view types.
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// We cannot use a template function because it cannot be virtual; we want to
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// have a virtual function here to enforce that different storages supporting
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// the same view implement the same signature.
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// Note that we allow different views to have custom signatures, providing
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// additional view-specific arguments that may be needed.
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virtual GlTextureView GetReadView(types<GlTextureView>, int plane) const = 0;
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virtual GlTextureView GetWriteView(types<GlTextureView>, int plane) = 0;
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};
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} // namespace internal
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} // namespace mediapipe
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#endif // MEDIAPIPE_GPU_GL_TEXTURE_VIEW_H_
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