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325 lines
11 KiB
325 lines
11 KiB
4 months ago
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/*
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* Copyright (C) 2016 The Android Open Source Project
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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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*/
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#include "EvsGlDisplay.h"
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#include <ui/GraphicBufferAllocator.h>
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#include <ui/GraphicBufferMapper.h>
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#include <utils/SystemClock.h>
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using ::android::frameworks::automotive::display::V1_0::HwDisplayConfig;
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using ::android::frameworks::automotive::display::V1_0::HwDisplayState;
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namespace android {
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namespace hardware {
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namespace automotive {
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namespace evs {
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namespace V1_1 {
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namespace implementation {
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#ifdef EVS_DEBUG
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static bool sDebugFirstFrameDisplayed = false;
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#endif
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EvsGlDisplay::EvsGlDisplay(sp<IAutomotiveDisplayProxyService> pDisplayProxy, uint64_t displayId)
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: mDisplayProxy(pDisplayProxy),
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mDisplayId(displayId) {
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LOG(DEBUG) << "EvsGlDisplay instantiated";
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// Set up our self description
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// NOTE: These are arbitrary values chosen for testing
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mInfo.displayId = "Mock Display";
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mInfo.vendorFlags = 3870;
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}
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EvsGlDisplay::~EvsGlDisplay() {
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LOG(DEBUG) << "EvsGlDisplay being destroyed";
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forceShutdown();
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}
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/**
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* This gets called if another caller "steals" ownership of the display
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*/
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void EvsGlDisplay::forceShutdown()
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{
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LOG(DEBUG) << "EvsGlDisplay forceShutdown";
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std::lock_guard<std::mutex> lock(mAccessLock);
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// If the buffer isn't being held by a remote client, release it now as an
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// optimization to release the resources more quickly than the destructor might
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// get called.
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if (mBuffer.memHandle) {
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// Report if we're going away while a buffer is outstanding
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if (mFrameBusy) {
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LOG(ERROR) << "EvsGlDisplay going down while client is holding a buffer";
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}
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// Drop the graphics buffer we've been using
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GraphicBufferAllocator& alloc(GraphicBufferAllocator::get());
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alloc.free(mBuffer.memHandle);
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mBuffer.memHandle = nullptr;
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mGlWrapper.hideWindow(mDisplayProxy, mDisplayId);
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mGlWrapper.shutdown();
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}
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// Put this object into an unrecoverable error state since somebody else
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// is going to own the display now.
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mRequestedState = EvsDisplayState::DEAD;
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}
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/**
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* Returns basic information about the EVS display provided by the system.
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* See the description of the DisplayDesc structure for details.
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*/
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Return<void> EvsGlDisplay::getDisplayInfo(getDisplayInfo_cb _hidl_cb) {
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LOG(DEBUG) << __FUNCTION__;
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// Send back our self description
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_hidl_cb(mInfo);
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return Void();
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}
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/**
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* Clients may set the display state to express their desired state.
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* The HAL implementation must gracefully accept a request for any state
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* while in any other state, although the response may be to ignore the request.
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* The display is defined to start in the NOT_VISIBLE state upon initialization.
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* The client is then expected to request the VISIBLE_ON_NEXT_FRAME state, and
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* then begin providing video. When the display is no longer required, the client
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* is expected to request the NOT_VISIBLE state after passing the last video frame.
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*/
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Return<EvsResult> EvsGlDisplay::setDisplayState(EvsDisplayState state) {
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LOG(DEBUG) << __FUNCTION__;
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std::lock_guard<std::mutex> lock(mAccessLock);
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if (mRequestedState == EvsDisplayState::DEAD) {
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// This object no longer owns the display -- it's been superceeded!
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return EvsResult::OWNERSHIP_LOST;
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}
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// Ensure we recognize the requested state so we don't go off the rails
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if (state >= EvsDisplayState::NUM_STATES) {
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return EvsResult::INVALID_ARG;
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}
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switch (state) {
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case EvsDisplayState::NOT_VISIBLE:
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mGlWrapper.hideWindow(mDisplayProxy, mDisplayId);
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break;
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case EvsDisplayState::VISIBLE:
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mGlWrapper.showWindow(mDisplayProxy, mDisplayId);
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break;
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default:
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break;
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}
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// Record the requested state
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mRequestedState = state;
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return EvsResult::OK;
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}
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/**
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* The HAL implementation should report the actual current state, which might
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* transiently differ from the most recently requested state. Note, however, that
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* the logic responsible for changing display states should generally live above
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* the device layer, making it undesirable for the HAL implementation to
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* spontaneously change display states.
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*/
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Return<EvsDisplayState> EvsGlDisplay::getDisplayState() {
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LOG(DEBUG) << __FUNCTION__;
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std::lock_guard<std::mutex> lock(mAccessLock);
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return mRequestedState;
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}
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/**
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* This call returns a handle to a frame buffer associated with the display.
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* This buffer may be locked and written to by software and/or GL. This buffer
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* must be returned via a call to returnTargetBufferForDisplay() even if the
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* display is no longer visible.
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*/
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Return<void> EvsGlDisplay::getTargetBuffer(getTargetBuffer_cb _hidl_cb) {
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LOG(DEBUG) << __FUNCTION__;
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std::lock_guard<std::mutex> lock(mAccessLock);
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if (mRequestedState == EvsDisplayState::DEAD) {
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LOG(ERROR) << "Rejecting buffer request from object that lost ownership of the display.";
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_hidl_cb({});
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return Void();
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}
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// If we don't already have a buffer, allocate one now
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if (!mBuffer.memHandle) {
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// Initialize our display window
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// NOTE: This will cause the display to become "VISIBLE" before a frame is actually
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// returned, which is contrary to the spec and will likely result in a black frame being
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// (briefly) shown.
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if (!mGlWrapper.initialize(mDisplayProxy, mDisplayId)) {
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// Report the failure
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LOG(ERROR) << "Failed to initialize GL display";
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_hidl_cb({});
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return Void();
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}
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// Assemble the buffer description we'll use for our render target
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mBuffer.width = mGlWrapper.getWidth();
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mBuffer.height = mGlWrapper.getHeight();
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mBuffer.format = HAL_PIXEL_FORMAT_RGBA_8888;
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mBuffer.usage = GRALLOC_USAGE_HW_RENDER | GRALLOC_USAGE_HW_COMPOSER;
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mBuffer.bufferId = 0x3870; // Arbitrary magic number for self recognition
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mBuffer.pixelSize = 4;
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// Allocate the buffer that will hold our displayable image
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buffer_handle_t handle = nullptr;
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GraphicBufferAllocator& alloc(GraphicBufferAllocator::get());
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status_t result = alloc.allocate(mBuffer.width, mBuffer.height,
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mBuffer.format, 1,
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mBuffer.usage, &handle,
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&mBuffer.stride,
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0, "EvsGlDisplay");
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if (result != NO_ERROR) {
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LOG(ERROR) << "Error " << result
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<< " allocating " << mBuffer.width << " x " << mBuffer.height
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<< " graphics buffer.";
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_hidl_cb({});
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mGlWrapper.shutdown();
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return Void();
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}
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if (!handle) {
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LOG(ERROR) << "We didn't get a buffer handle back from the allocator";
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_hidl_cb({});
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mGlWrapper.shutdown();
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return Void();
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}
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mBuffer.memHandle = handle;
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LOG(DEBUG) << "Allocated new buffer " << mBuffer.memHandle.getNativeHandle()
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<< " with stride " << mBuffer.stride;
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mFrameBusy = false;
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}
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// Do we have a frame available?
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if (mFrameBusy) {
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// This means either we have a 2nd client trying to compete for buffers
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// (an unsupported mode of operation) or else the client hasn't returned
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// a previously issued buffer yet (they're behaving badly).
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// NOTE: We have to make the callback even if we have nothing to provide
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LOG(ERROR) << "getTargetBuffer called while no buffers available.";
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_hidl_cb({});
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return Void();
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} else {
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// Mark our buffer as busy
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mFrameBusy = true;
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// Send the buffer to the client
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LOG(VERBOSE) << "Providing display buffer handle " << mBuffer.memHandle.getNativeHandle()
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<< " as id " << mBuffer.bufferId;
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_hidl_cb(mBuffer);
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return Void();
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}
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}
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/**
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* This call tells the display that the buffer is ready for display.
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* The buffer is no longer valid for use by the client after this call.
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*/
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Return<EvsResult> EvsGlDisplay::returnTargetBufferForDisplay(const BufferDesc_1_0& buffer) {
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LOG(VERBOSE) << __FUNCTION__ << " " << buffer.memHandle.getNativeHandle();
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std::lock_guard<std::mutex> lock(mAccessLock);
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// Nobody should call us with a null handle
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if (!buffer.memHandle.getNativeHandle()) {
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LOG(ERROR) << __FUNCTION__
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<< " called without a valid buffer handle.";
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return EvsResult::INVALID_ARG;
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}
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if (buffer.bufferId != mBuffer.bufferId) {
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LOG(ERROR) << "Got an unrecognized frame returned.";
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return EvsResult::INVALID_ARG;
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}
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if (!mFrameBusy) {
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LOG(ERROR) << "A frame was returned with no outstanding frames.";
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return EvsResult::BUFFER_NOT_AVAILABLE;
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}
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mFrameBusy = false;
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// If we've been displaced by another owner of the display, then we can't do anything else
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if (mRequestedState == EvsDisplayState::DEAD) {
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return EvsResult::OWNERSHIP_LOST;
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}
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// If we were waiting for a new frame, this is it!
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if (mRequestedState == EvsDisplayState::VISIBLE_ON_NEXT_FRAME) {
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mRequestedState = EvsDisplayState::VISIBLE;
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mGlWrapper.showWindow(mDisplayProxy, mDisplayId);
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}
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// Validate we're in an expected state
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if (mRequestedState != EvsDisplayState::VISIBLE) {
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// Not sure why a client would send frames back when we're not visible.
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LOG(WARNING) << "Got a frame returned while not visible - ignoring.";
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} else {
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// Update the texture contents with the provided data
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// TODO: Why doesn't it work to pass in the buffer handle we got from HIDL?
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// if (!mGlWrapper.updateImageTexture(buffer)) {
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if (!mGlWrapper.updateImageTexture(mBuffer)) {
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return EvsResult::UNDERLYING_SERVICE_ERROR;
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}
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// Put the image on the screen
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mGlWrapper.renderImageToScreen();
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#ifdef EVS_DEBUG
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if (!sDebugFirstFrameDisplayed) {
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LOG(DEBUG) << "EvsFirstFrameDisplayTiming start time: "
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<< elapsedRealtime() << " ms.";
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sDebugFirstFrameDisplayed = true;
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}
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#endif
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}
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return EvsResult::OK;
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}
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Return<void> EvsGlDisplay::getDisplayInfo_1_1(getDisplayInfo_1_1_cb _info_cb) {
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if (mDisplayProxy != nullptr) {
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return mDisplayProxy->getDisplayInfo(mDisplayId, _info_cb);
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} else {
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_info_cb({}, {});
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return Void();
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}
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}
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} // namespace implementation
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} // namespace V1_1
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} // namespace evs
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} // namespace automotive
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} // namespace hardware
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} // namespace android
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