/* * Copyright (C) 2018 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. */ #pragma once #include #include #include #include #include #include #include "EGLConsumer.h" #include "ImageConsumer.h" namespace android { namespace uirenderer { class RenderState; } /* * SurfaceTexture consumes buffers of graphics data from a BufferQueue, * and makes them available to HWUI render thread as a SkImage and to * an application GL render thread as an OpenGL texture. * * When attached to an application GL render thread, a typical usage * pattern is to set up the SurfaceTexture with the * desired options, and call updateTexImage() when a new frame is desired. * If a new frame is available, the texture will be updated. If not, * the previous contents are retained. * * When attached to a HWUI render thread, the TextureView implementation * calls dequeueImage, which either pulls a new SkImage or returns the * last cached SkImage if BufferQueue is empty. * When attached to HWUI render thread, SurfaceTexture is compatible to * both Vulkan and GL drawing pipelines. */ class ANDROID_API SurfaceTexture : public ConsumerBase { public: enum { TEXTURE_EXTERNAL = 0x8D65 }; // GL_TEXTURE_EXTERNAL_OES typedef ConsumerBase::FrameAvailableListener FrameAvailableListener; /** * SurfaceTexture constructs a new SurfaceTexture object. If the constructor with * the tex parameter is used, tex indicates the name of the OpenGL ES * texture to which images are to be streamed. texTarget specifies the * OpenGL ES texture target to which the texture will be bound in * updateTexImage. useFenceSync specifies whether fences should be used to * synchronize access to buffers if that behavior is enabled at * compile-time. * * A SurfaceTexture may be detached from one OpenGL ES context and then * attached to a different context using the detachFromContext and * attachToContext methods, respectively. The intention of these methods is * purely to allow a SurfaceTexture to be transferred from one consumer * context to another. If such a transfer is not needed there is no * requirement that either of these methods be called. * * If the constructor with the tex parameter is used, the SurfaceTexture is * created in a state where it is considered attached to an OpenGL ES * context for the purposes of the attachToContext and detachFromContext * methods. However, despite being considered "attached" to a context, the * specific OpenGL ES context doesn't get latched until the first call to * updateTexImage. After that point, all calls to updateTexImage must be * made with the same OpenGL ES context current. * * If the constructor without the tex parameter is used, the SurfaceTexture is * created in a detached state, and attachToContext must be called before * calls to updateTexImage. */ SurfaceTexture(const sp& bq, uint32_t tex, uint32_t texureTarget, bool useFenceSync, bool isControlledByApp); SurfaceTexture(const sp& bq, uint32_t texureTarget, bool useFenceSync, bool isControlledByApp); /** * updateTexImage acquires the most recently queued buffer, and sets the * image contents of the target texture to it. * * This call may only be made while the OpenGL ES context to which the * target texture belongs is bound to the calling thread. * * This calls doGLFenceWait to ensure proper synchronization. */ status_t updateTexImage(); /** * releaseTexImage releases the texture acquired in updateTexImage(). * This is intended to be used in single buffer mode. * * This call may only be made while the OpenGL ES context to which the * target texture belongs is bound to the calling thread. */ status_t releaseTexImage(); /** * getTransformMatrix retrieves the 4x4 texture coordinate transform matrix * associated with the texture image set by the most recent call to * updateTexImage. * * This transform matrix maps 2D homogeneous texture coordinates of the form * (s, t, 0, 1) with s and t in the inclusive range [0, 1] to the texture * coordinate that should be used to sample that location from the texture. * Sampling the texture outside of the range of this transform is undefined. * * This transform is necessary to compensate for transforms that the stream * content producer may implicitly apply to the content. By forcing users of * a SurfaceTexture to apply this transform we avoid performing an extra * copy of the data that would be needed to hide the transform from the * user. * * The matrix is stored in column-major order so that it may be passed * directly to OpenGL ES via the glLoadMatrixf or glUniformMatrix4fv * functions. */ void getTransformMatrix(float mtx[16]); /** * Computes the transform matrix documented by getTransformMatrix * from the BufferItem sub parts. */ static void computeTransformMatrix(float outTransform[16], const sp& buf, const Rect& cropRect, uint32_t transform, bool filtering); /** * Scale the crop down horizontally or vertically such that it has the * same aspect ratio as the buffer does. */ static Rect scaleDownCrop(const Rect& crop, uint32_t bufferWidth, uint32_t bufferHeight); /** * getTimestamp retrieves the timestamp associated with the texture image * set by the most recent call to updateTexImage. * * The timestamp is in nanoseconds, and is monotonically increasing. Its * other semantics (zero point, etc) are source-dependent and should be * documented by the source. */ int64_t getTimestamp(); /** * getDataSpace retrieves the DataSpace associated with the texture image * set by the most recent call to updateTexImage. */ android_dataspace getCurrentDataSpace(); /** * getFrameNumber retrieves the frame number associated with the texture * image set by the most recent call to updateTexImage. * * The frame number is an incrementing counter set to 0 at the creation of * the BufferQueue associated with this consumer. */ uint64_t getFrameNumber(); /** * setDefaultBufferSize is used to set the size of buffers returned by * requestBuffers when a with and height of zero is requested. * A call to setDefaultBufferSize() may trigger requestBuffers() to * be called from the client. * The width and height parameters must be no greater than the minimum of * GL_MAX_VIEWPORT_DIMS and GL_MAX_TEXTURE_SIZE (see: glGetIntegerv). * An error due to invalid dimensions might not be reported until * updateTexImage() is called. */ status_t setDefaultBufferSize(uint32_t width, uint32_t height); /** * setFilteringEnabled sets whether the transform matrix should be computed * for use with bilinear filtering. */ void setFilteringEnabled(bool enabled); /** * getCurrentTextureTarget returns the texture target of the current * texture as returned by updateTexImage(). */ uint32_t getCurrentTextureTarget() const; /** * getCurrentCrop returns the cropping rectangle of the current buffer. */ Rect getCurrentCrop() const; /** * getCurrentTransform returns the transform of the current buffer. */ uint32_t getCurrentTransform() const; /** * getCurrentScalingMode returns the scaling mode of the current buffer. */ uint32_t getCurrentScalingMode() const; /** * getCurrentFence returns the fence indicating when the current buffer is * ready to be read from. */ sp getCurrentFence() const; /** * getCurrentFence returns the FenceTime indicating when the current * buffer is ready to be read from. */ std::shared_ptr getCurrentFenceTime() const; /** * setConsumerUsageBits overrides the ConsumerBase method to OR * DEFAULT_USAGE_FLAGS to usage. */ status_t setConsumerUsageBits(uint64_t usage); /** * detachFromContext detaches the SurfaceTexture from the calling thread's * current OpenGL ES context. This context must be the same as the context * that was current for previous calls to updateTexImage. * * Detaching a SurfaceTexture from an OpenGL ES context will result in the * deletion of the OpenGL ES texture object into which the images were being * streamed. After a SurfaceTexture has been detached from the OpenGL ES * context calls to updateTexImage will fail returning INVALID_OPERATION * until the SurfaceTexture is attached to a new OpenGL ES context using the * attachToContext method. */ status_t detachFromContext(); /** * attachToContext attaches a SurfaceTexture that is currently in the * 'detached' state to the current OpenGL ES context. A SurfaceTexture is * in the 'detached' state iff detachFromContext has successfully been * called and no calls to attachToContext have succeeded since the last * detachFromContext call. Calls to attachToContext made on a * SurfaceTexture that is not in the 'detached' state will result in an * INVALID_OPERATION error. * * The tex argument specifies the OpenGL ES texture object name in the * new context into which the image contents will be streamed. A successful * call to attachToContext will result in this texture object being bound to * the texture target and populated with the image contents that were * current at the time of the last call to detachFromContext. */ status_t attachToContext(uint32_t tex); sk_sp dequeueImage(SkMatrix& transformMatrix, bool* queueEmpty, uirenderer::RenderState& renderState); /** * attachToView attaches a SurfaceTexture that is currently in the * 'detached' state to HWUI View system. */ void attachToView(); /** * detachFromView detaches a SurfaceTexture from HWUI View system. */ void detachFromView(); protected: /** * abandonLocked overrides the ConsumerBase method to clear * mCurrentTextureImage in addition to the ConsumerBase behavior. */ virtual void abandonLocked(); /** * dumpLocked overrides the ConsumerBase method to dump SurfaceTexture- * specific info in addition to the ConsumerBase behavior. */ virtual void dumpLocked(String8& result, const char* prefix) const override; /** * acquireBufferLocked overrides the ConsumerBase method to update the * mEglSlots array in addition to the ConsumerBase behavior. */ virtual status_t acquireBufferLocked(BufferItem* item, nsecs_t presentWhen, uint64_t maxFrameNumber = 0) override; /** * releaseBufferLocked overrides the ConsumerBase method to update the * mEglSlots array in addition to the ConsumerBase. */ virtual status_t releaseBufferLocked(int slot, const sp graphicBuffer, EGLDisplay display, EGLSyncKHR eglFence) override; /** * freeBufferLocked frees up the given buffer slot. If the slot has been * initialized this will release the reference to the GraphicBuffer in that * slot and destroy the EGLImage in that slot. Otherwise it has no effect. * * This method must be called with mMutex locked. */ virtual void freeBufferLocked(int slotIndex); /** * computeCurrentTransformMatrixLocked computes the transform matrix for the * current texture. It uses mCurrentTransform and the current GraphicBuffer * to compute this matrix and stores it in mCurrentTransformMatrix. * mCurrentTextureImage must not be NULL. */ void computeCurrentTransformMatrixLocked(); /** * The default consumer usage flags that SurfaceTexture always sets on its * BufferQueue instance; these will be OR:d with any additional flags passed * from the SurfaceTexture user. In particular, SurfaceTexture will always * consume buffers as hardware textures. */ static const uint64_t DEFAULT_USAGE_FLAGS = GraphicBuffer::USAGE_HW_TEXTURE; /** * mCurrentCrop is the crop rectangle that applies to the current texture. * It gets set each time updateTexImage is called. */ Rect mCurrentCrop; /** * mCurrentTransform is the transform identifier for the current texture. It * gets set each time updateTexImage is called. */ uint32_t mCurrentTransform; /** * mCurrentScalingMode is the scaling mode for the current texture. It gets * set each time updateTexImage is called. */ uint32_t mCurrentScalingMode; /** * mCurrentFence is the fence received from BufferQueue in updateTexImage. */ sp mCurrentFence; /** * The FenceTime wrapper around mCurrentFence. */ std::shared_ptr mCurrentFenceTime{FenceTime::NO_FENCE}; /** * mCurrentTransformMatrix is the transform matrix for the current texture. * It gets computed by computeTransformMatrix each time updateTexImage is * called. */ float mCurrentTransformMatrix[16]; /** * mCurrentTimestamp is the timestamp for the current texture. It * gets set each time updateTexImage is called. */ int64_t mCurrentTimestamp; /** * mCurrentDataSpace is the dataspace for the current texture. It * gets set each time updateTexImage is called. */ android_dataspace mCurrentDataSpace; /** * mCurrentFrameNumber is the frame counter for the current texture. * It gets set each time updateTexImage is called. */ uint64_t mCurrentFrameNumber; uint32_t mDefaultWidth, mDefaultHeight; /** * mFilteringEnabled indicates whether the transform matrix is computed for * use with bilinear filtering. It defaults to true and is changed by * setFilteringEnabled(). */ bool mFilteringEnabled; /** * mTexName is the name of the OpenGL texture to which streamed images will * be bound when updateTexImage is called. It is set at construction time * and can be changed with a call to attachToContext. */ uint32_t mTexName; /** * mUseFenceSync indicates whether creation of the EGL_KHR_fence_sync * extension should be used to prevent buffers from being dequeued before * it's safe for them to be written. It gets set at construction time and * never changes. */ const bool mUseFenceSync; /** * mTexTarget is the GL texture target with which the GL texture object is * associated. It is set in the constructor and never changed. It is * almost always GL_TEXTURE_EXTERNAL_OES except for one use case in Android * Browser. In that case it is set to GL_TEXTURE_2D to allow * glCopyTexSubImage to read from the texture. This is a hack to work * around a GL driver limitation on the number of FBO attachments, which the * browser's tile cache exceeds. */ const uint32_t mTexTarget; /** * mCurrentTexture is the buffer slot index of the buffer that is currently * bound to the OpenGL texture. It is initialized to INVALID_BUFFER_SLOT, * indicating that no buffer slot is currently bound to the texture. Note, * however, that a value of INVALID_BUFFER_SLOT does not necessarily mean * that no buffer is bound to the texture. A call to setBufferCount will * reset mCurrentTexture to INVALID_BUFFER_SLOT. */ int mCurrentTexture; enum class OpMode { detached, attachedToView, attachedToGL }; /** * mOpMode indicates whether the SurfaceTexture is currently attached to * an OpenGL ES context or the HWUI view system. For legacy reasons, this is initialized to, * "attachedToGL" indicating that the SurfaceTexture is considered to be attached to * whatever GL context is current at the time of the first updateTexImage call. * It is set to "detached" by detachFromContext, and then set to "attachedToGL" again by * attachToContext. * attachToView/detachFromView are used to attach/detach from HWUI view system. */ OpMode mOpMode; /** * mEGLConsumer has SurfaceTexture logic used when attached to GL context. */ EGLConsumer mEGLConsumer; /** * mImageConsumer has SurfaceTexture logic used when attached to HWUI view system. */ ImageConsumer mImageConsumer; friend class ImageConsumer; friend class EGLConsumer; }; // ---------------------------------------------------------------------------- } // namespace android