blob: 90781f1aeaf503208417cc945e2d16546234bdd4 [file] [log] [blame]
/*
* Copyright (C) 2011 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.
*/
#include <string.h>
#include <pthread.h>
#ifdef HAVE_ANDROID_OS // just want PAGE_SIZE define
# include <asm/page.h>
#else
# include <sys/user.h>
#endif
#include <cutils/ashmem.h>
#include <unistd.h>
#include <errno.h>
#include <dlfcn.h>
#include <sys/mman.h>
#include "gralloc_cb.h"
#include "HostConnection.h"
#include "glUtils.h"
#include <cutils/log.h>
#include <cutils/properties.h>
/* Set to 1 or 2 to enable debug traces */
#define DEBUG 0
#if DEBUG >= 1
# define D(...) ALOGD(__VA_ARGS__)
#else
# define D(...) ((void)0)
#endif
#if DEBUG >= 2
# define DD(...) ALOGD(__VA_ARGS__)
#else
# define DD(...) ((void)0)
#endif
#define DBG_FUNC DBG("%s\n", __FUNCTION__)
//
// our private gralloc module structure
//
struct private_module_t {
gralloc_module_t base;
};
/* If not NULL, this is a pointer to the fallback module.
* This really is gralloc.default, which we'll use if we detect
* that the emulator we're running in does not support GPU emulation.
*/
static gralloc_module_t* sFallback;
static pthread_once_t sFallbackOnce = PTHREAD_ONCE_INIT;
static void fallback_init(void); // forward
typedef struct _alloc_list_node {
buffer_handle_t handle;
_alloc_list_node *next;
_alloc_list_node *prev;
} AllocListNode;
//
// Our gralloc device structure (alloc interface)
//
struct gralloc_device_t {
alloc_device_t device;
AllocListNode *allocListHead; // double linked list of allocated buffers
pthread_mutex_t lock;
};
//
// Our framebuffer device structure
//
struct fb_device_t {
framebuffer_device_t device;
};
static int map_buffer(cb_handle_t *cb, void **vaddr)
{
if (cb->fd < 0 || cb->ashmemSize <= 0) {
return -EINVAL;
}
void *addr = mmap(0, cb->ashmemSize, PROT_READ | PROT_WRITE,
MAP_SHARED, cb->fd, 0);
if (addr == MAP_FAILED) {
return -errno;
}
cb->ashmemBase = intptr_t(addr);
cb->ashmemBasePid = getpid();
*vaddr = addr;
return 0;
}
#define DEFINE_HOST_CONNECTION \
HostConnection *hostCon = HostConnection::get(); \
renderControl_encoder_context_t *rcEnc = (hostCon ? hostCon->rcEncoder() : NULL)
#define DEFINE_AND_VALIDATE_HOST_CONNECTION \
HostConnection *hostCon = HostConnection::get(); \
if (!hostCon) { \
ALOGE("gralloc: Failed to get host connection\n"); \
return -EIO; \
} \
renderControl_encoder_context_t *rcEnc = hostCon->rcEncoder(); \
if (!rcEnc) { \
ALOGE("gralloc: Failed to get renderControl encoder context\n"); \
return -EIO; \
}
//
// gralloc device functions (alloc interface)
//
static int gralloc_alloc(alloc_device_t* dev,
int w, int h, int format, int usage,
buffer_handle_t* pHandle, int* pStride)
{
D("gralloc_alloc w=%d h=%d usage=0x%x\n", w, h, usage);
gralloc_device_t *grdev = (gralloc_device_t *)dev;
if (!grdev || !pHandle || !pStride)
return -EINVAL;
//
// Validate usage: buffer cannot be written both by s/w and h/w access.
//
bool sw_write = (0 != (usage & GRALLOC_USAGE_SW_WRITE_MASK));
bool hw_write = (usage & GRALLOC_USAGE_HW_RENDER);
if (hw_write && sw_write) {
return -EINVAL;
}
bool sw_read = (0 != (usage & GRALLOC_USAGE_SW_READ_MASK));
int ashmem_size = 0;
int stride = w;
GLenum glFormat = 0;
GLenum glType = 0;
int bpp = 0;
int align = 1;
switch (format) {
case HAL_PIXEL_FORMAT_RGBA_8888:
case HAL_PIXEL_FORMAT_RGBX_8888:
case HAL_PIXEL_FORMAT_BGRA_8888:
bpp = 4;
glFormat = GL_RGBA;
glType = GL_UNSIGNED_BYTE;
break;
case HAL_PIXEL_FORMAT_RGB_888:
bpp = 3;
glFormat = GL_RGB;
glType = GL_UNSIGNED_BYTE;
break;
case HAL_PIXEL_FORMAT_RGB_565:
bpp = 2;
glFormat = GL_RGB;
glType = GL_UNSIGNED_SHORT_5_6_5;
break;
case HAL_PIXEL_FORMAT_RGBA_5551:
bpp = 2;
glFormat = GL_RGB5_A1_OES;
glType = GL_UNSIGNED_SHORT_5_5_5_1;
break;
case HAL_PIXEL_FORMAT_RGBA_4444:
bpp = 2;
glFormat = GL_RGBA4_OES;
glType = GL_UNSIGNED_SHORT_4_4_4_4;
break;
case HAL_PIXEL_FORMAT_RAW_SENSOR:
bpp = 2;
align = 16*bpp;
if (! (sw_read && sw_write) ) {
// Raw sensor data cannot be used by HW
return -EINVAL;
}
// Not expecting to actually create any GL surfaces for this
glFormat = GL_LUMINANCE;
glType = GL_UNSIGNED_SHORT;
break;
case HAL_PIXEL_FORMAT_BLOB:
bpp = 1;
if (! (sw_read && sw_write) ) {
// Blob data cannot be used by HW
return -EINVAL;
}
// Not expecting to actually create any GL surfaces for this
glFormat = GL_LUMINANCE;
glType = GL_UNSIGNED_BYTE;
break;
default:
return -EINVAL;
}
if (usage & GRALLOC_USAGE_HW_FB) {
// keep space for postCounter
ashmem_size += sizeof(uint32_t);
}
if (sw_read || sw_write) {
// keep space for image on guest memory if SW access is needed
size_t bpr = (w*bpp + (align-1)) & ~(align-1);
ashmem_size += (bpr * h);
stride = bpr / bpp;
}
D("gralloc_alloc ashmem_size=%d, stride=%d, tid %d\n", ashmem_size, stride,
gettid());
//
// Allocate space in ashmem if needed
//
int fd = -1;
if (ashmem_size > 0) {
// round to page size;
ashmem_size = (ashmem_size + (PAGE_SIZE-1)) & ~(PAGE_SIZE-1);
fd = ashmem_create_region("gralloc-buffer", ashmem_size);
if (fd < 0) {
ALOGE("gralloc_alloc failed to create ashmem region: %s\n",
strerror(errno));
return -errno;
}
}
cb_handle_t *cb = new cb_handle_t(fd, ashmem_size, usage,
w, h, glFormat, glType);
if (ashmem_size > 0) {
//
// map ashmem region if exist
//
void *vaddr;
int err = map_buffer(cb, &vaddr);
if (err) {
close(fd);
delete cb;
return err;
}
cb->setFd(fd);
}
//
// Allocate ColorBuffer handle on the host (only if h/w access is allowed)
//
if (usage & GRALLOC_USAGE_HW_MASK) {
DEFINE_HOST_CONNECTION;
if (hostCon && rcEnc) {
cb->hostHandle = rcEnc->rcCreateColorBuffer(rcEnc, w, h, glFormat);
D("Created host ColorBuffer 0x%x\n", cb->hostHandle);
}
if (!cb->hostHandle) {
// Could not create colorbuffer on host !!!
close(fd);
delete cb;
return -EIO;
}
}
//
// alloc succeeded - insert the allocated handle to the allocated list
//
AllocListNode *node = new AllocListNode();
pthread_mutex_lock(&grdev->lock);
node->handle = cb;
node->next = grdev->allocListHead;
node->prev = NULL;
if (grdev->allocListHead) {
grdev->allocListHead->prev = node;
}
grdev->allocListHead = node;
pthread_mutex_unlock(&grdev->lock);
*pHandle = cb;
*pStride = stride;
return 0;
}
static int gralloc_free(alloc_device_t* dev,
buffer_handle_t handle)
{
const cb_handle_t *cb = (const cb_handle_t *)handle;
if (!cb_handle_t::validate((cb_handle_t*)cb)) {
ERR("gralloc_free: invalid handle");
return -EINVAL;
}
if (cb->hostHandle != 0) {
DEFINE_AND_VALIDATE_HOST_CONNECTION;
D("Closing host ColorBuffer 0x%x\n", cb->hostHandle);
rcEnc->rcCloseColorBuffer(rcEnc, cb->hostHandle);
}
//
// detach and unmap ashmem area if present
//
if (cb->fd > 0) {
if (cb->ashmemSize > 0 && cb->ashmemBase) {
munmap((void *)cb->ashmemBase, cb->ashmemSize);
}
close(cb->fd);
}
// remove it from the allocated list
gralloc_device_t *grdev = (gralloc_device_t *)dev;
pthread_mutex_lock(&grdev->lock);
AllocListNode *n = grdev->allocListHead;
while( n && n->handle != cb ) {
n = n->next;
}
if (n) {
// buffer found on list - remove it from list
if (n->next) {
n->next->prev = n->prev;
}
if (n->prev) {
n->prev->next = n->next;
}
else {
grdev->allocListHead = n->next;
}
delete n;
}
pthread_mutex_unlock(&grdev->lock);
delete cb;
return 0;
}
static int gralloc_device_close(struct hw_device_t *dev)
{
gralloc_device_t* d = reinterpret_cast<gralloc_device_t*>(dev);
if (d) {
// free still allocated buffers
while( d->allocListHead != NULL ) {
gralloc_free(&d->device, d->allocListHead->handle);
}
// free device
free(d);
}
return 0;
}
static int fb_compositionComplete(struct framebuffer_device_t* dev)
{
return 0;
}
//
// Framebuffer device functions
//
static int fb_post(struct framebuffer_device_t* dev, buffer_handle_t buffer)
{
fb_device_t *fbdev = (fb_device_t *)dev;
cb_handle_t *cb = (cb_handle_t *)buffer;
if (!fbdev || !cb_handle_t::validate(cb) || !cb->canBePosted()) {
return -EINVAL;
}
// Make sure we have host connection
DEFINE_AND_VALIDATE_HOST_CONNECTION;
// increment the post count of the buffer
uint32_t *postCountPtr = (uint32_t *)cb->ashmemBase;
if (!postCountPtr) {
// This should not happen
return -EINVAL;
}
(*postCountPtr)++;
// send post request to host
rcEnc->rcFBPost(rcEnc, cb->hostHandle);
hostCon->flush();
return 0;
}
static int fb_setUpdateRect(struct framebuffer_device_t* dev,
int l, int t, int w, int h)
{
fb_device_t *fbdev = (fb_device_t *)dev;
if (!fbdev) {
return -EINVAL;
}
// Make sure we have host connection
DEFINE_AND_VALIDATE_HOST_CONNECTION;
// send request to host
// TODO: XXX - should be implemented
//rcEnc->rc_XXX
return 0;
}
static int fb_setSwapInterval(struct framebuffer_device_t* dev,
int interval)
{
fb_device_t *fbdev = (fb_device_t *)dev;
if (!fbdev) {
return -EINVAL;
}
// Make sure we have host connection
DEFINE_AND_VALIDATE_HOST_CONNECTION;
// send request to host
rcEnc->rcFBSetSwapInterval(rcEnc, interval);
hostCon->flush();
return 0;
}
static int fb_close(struct hw_device_t *dev)
{
fb_device_t *fbdev = (fb_device_t *)dev;
delete fbdev;
return 0;
}
//
// gralloc module functions - refcount + locking interface
//
static int gralloc_register_buffer(gralloc_module_t const* module,
buffer_handle_t handle)
{
pthread_once(&sFallbackOnce, fallback_init);
if (sFallback != NULL) {
return sFallback->registerBuffer(sFallback, handle);
}
D("gralloc_register_buffer(%p) called", handle);
private_module_t *gr = (private_module_t *)module;
cb_handle_t *cb = (cb_handle_t *)handle;
if (!gr || !cb_handle_t::validate(cb)) {
ERR("gralloc_register_buffer(%p): invalid buffer", cb);
return -EINVAL;
}
if (cb->hostHandle != 0) {
DEFINE_AND_VALIDATE_HOST_CONNECTION;
D("Opening host ColorBuffer 0x%x\n", cb->hostHandle);
rcEnc->rcOpenColorBuffer(rcEnc, cb->hostHandle);
}
//
// if the color buffer has ashmem region and it is not mapped in this
// process map it now.
//
if (cb->ashmemSize > 0 && cb->mappedPid != getpid()) {
void *vaddr;
int err = map_buffer(cb, &vaddr);
if (err) {
ERR("gralloc_register_buffer(%p): map failed: %s", cb, strerror(-err));
return -err;
}
cb->mappedPid = getpid();
}
return 0;
}
static int gralloc_unregister_buffer(gralloc_module_t const* module,
buffer_handle_t handle)
{
if (sFallback != NULL) {
return sFallback->unregisterBuffer(sFallback, handle);
}
private_module_t *gr = (private_module_t *)module;
cb_handle_t *cb = (cb_handle_t *)handle;
if (!gr || !cb_handle_t::validate(cb)) {
ERR("gralloc_unregister_buffer(%p): invalid buffer", cb);
return -EINVAL;
}
if (cb->hostHandle != 0) {
DEFINE_AND_VALIDATE_HOST_CONNECTION;
D("Closing host ColorBuffer 0x%x\n", cb->hostHandle);
rcEnc->rcCloseColorBuffer(rcEnc, cb->hostHandle);
}
//
// unmap ashmem region if it was previously mapped in this process
// (through register_buffer)
//
if (cb->ashmemSize > 0 && cb->mappedPid == getpid()) {
void *vaddr;
int err = munmap((void *)cb->ashmemBase, cb->ashmemSize);
if (err) {
ERR("gralloc_unregister_buffer(%p): unmap failed", cb);
return -EINVAL;
}
cb->ashmemBase = NULL;
cb->mappedPid = 0;
}
D("gralloc_unregister_buffer(%p) done\n", cb);
return 0;
}
static int gralloc_lock(gralloc_module_t const* module,
buffer_handle_t handle, int usage,
int l, int t, int w, int h,
void** vaddr)
{
if (sFallback != NULL) {
return sFallback->lock(sFallback, handle, usage, l, t, w, h, vaddr);
}
private_module_t *gr = (private_module_t *)module;
cb_handle_t *cb = (cb_handle_t *)handle;
if (!gr || !cb_handle_t::validate(cb)) {
ALOGE("gralloc_lock bad handle\n");
return -EINVAL;
}
// Validate usage,
// 1. cannot be locked for hw access
// 2. lock for either sw read or write.
// 3. locked sw access must match usage during alloc time.
bool sw_read = (0 != (usage & GRALLOC_USAGE_SW_READ_MASK));
bool sw_write = (0 != (usage & GRALLOC_USAGE_SW_WRITE_MASK));
bool hw_read = (usage & GRALLOC_USAGE_HW_TEXTURE);
bool hw_write = (usage & GRALLOC_USAGE_HW_RENDER);
bool sw_read_allowed = (0 != (cb->usage & GRALLOC_USAGE_SW_READ_MASK));
bool sw_write_allowed = (0 != (cb->usage & GRALLOC_USAGE_SW_WRITE_MASK));
if ( (hw_read || hw_write) ||
(!sw_read && !sw_write) ||
(sw_read && !sw_read_allowed) ||
(sw_write && !sw_write_allowed) ) {
ALOGE("gralloc_lock usage mismatch usage=0x%x cb->usage=0x%x\n", usage, cb->usage);
return -EINVAL;
}
EGLint postCount = 0;
void *cpu_addr = NULL;
//
// make sure ashmem area is mapped if needed
//
if (cb->canBePosted() || sw_read || sw_write) {
if (cb->ashmemBasePid != getpid() || !cb->ashmemBase) {
return -EACCES;
}
if (cb->canBePosted()) {
postCount = *((int *)cb->ashmemBase);
cpu_addr = (void *)(cb->ashmemBase + sizeof(int));
}
else {
cpu_addr = (void *)(cb->ashmemBase);
}
}
if (cb->hostHandle) {
// Make sure we have host connection
DEFINE_AND_VALIDATE_HOST_CONNECTION;
//
// flush color buffer write cache on host and get its sync status.
//
int hostSyncStatus = rcEnc->rcColorBufferCacheFlush(rcEnc, cb->hostHandle,
postCount,
sw_read);
if (hostSyncStatus < 0) {
// host failed the color buffer sync - probably since it was already
// locked for write access. fail the lock.
ALOGE("gralloc_lock cacheFlush failed postCount=%d sw_read=%d\n",
postCount, sw_read);
return -EBUSY;
}
}
//
// is virtual address required ?
//
if (sw_read || sw_write) {
*vaddr = cpu_addr;
}
if (sw_write) {
//
// Keep locked region if locked for s/w write access.
//
cb->lockedLeft = l;
cb->lockedTop = t;
cb->lockedWidth = w;
cb->lockedHeight = h;
}
return 0;
}
static int gralloc_unlock(gralloc_module_t const* module,
buffer_handle_t handle)
{
if (sFallback != NULL) {
return sFallback->unlock(sFallback, handle);
}
private_module_t *gr = (private_module_t *)module;
cb_handle_t *cb = (cb_handle_t *)handle;
if (!gr || !cb_handle_t::validate(cb)) {
return -EINVAL;
}
//
// if buffer was locked for s/w write, we need to update the host with
// the updated data
//
if (cb->lockedWidth > 0 && cb->lockedHeight > 0 && cb->hostHandle) {
// Make sure we have host connection
DEFINE_AND_VALIDATE_HOST_CONNECTION;
void *cpu_addr;
if (cb->canBePosted()) {
cpu_addr = (void *)(cb->ashmemBase + sizeof(int));
}
else {
cpu_addr = (void *)(cb->ashmemBase);
}
if (cb->lockedWidth < cb->width || cb->lockedHeight < cb->height) {
int bpp = glUtilsPixelBitSize(cb->glFormat, cb->glType) >> 3;
char *tmpBuf = new char[cb->lockedWidth * cb->lockedHeight * bpp];
int dst_line_len = cb->lockedWidth * bpp;
int src_line_len = cb->width * bpp;
char *src = (char *)cpu_addr + cb->lockedTop*src_line_len + cb->lockedLeft*bpp;
char *dst = tmpBuf;
for (int y=0; y<cb->lockedHeight; y++) {
memcpy(dst, src, dst_line_len);
src += src_line_len;
dst += dst_line_len;
}
rcEnc->rcUpdateColorBuffer(rcEnc, cb->hostHandle,
cb->lockedLeft, cb->lockedTop,
cb->lockedWidth, cb->lockedHeight,
cb->glFormat, cb->glType,
tmpBuf);
delete [] tmpBuf;
}
else {
rcEnc->rcUpdateColorBuffer(rcEnc, cb->hostHandle, 0, 0,
cb->width, cb->height,
cb->glFormat, cb->glType,
cpu_addr);
}
}
cb->lockedWidth = cb->lockedHeight = 0;
return 0;
}
static int gralloc_device_open(const hw_module_t* module,
const char* name,
hw_device_t** device)
{
int status = -EINVAL;
D("gralloc_device_open %s\n", name);
pthread_once( &sFallbackOnce, fallback_init );
if (sFallback != NULL) {
return sFallback->common.methods->open(&sFallback->common, name, device);
}
if (!strcmp(name, GRALLOC_HARDWARE_GPU0)) {
// Create host connection and keep it in the TLS.
// return error if connection with host can not be established
HostConnection *hostCon = HostConnection::get();
if (!hostCon) {
ALOGE("gralloc: failed to get host connection while opening %s\n", name);
return -EIO;
}
//
// Allocate memory for the gralloc device (alloc interface)
//
gralloc_device_t *dev;
dev = (gralloc_device_t*)malloc(sizeof(gralloc_device_t));
if (NULL == dev) {
return -ENOMEM;
}
// Initialize our device structure
//
dev->device.common.tag = HARDWARE_DEVICE_TAG;
dev->device.common.version = 0;
dev->device.common.module = const_cast<hw_module_t*>(module);
dev->device.common.close = gralloc_device_close;
dev->device.alloc = gralloc_alloc;
dev->device.free = gralloc_free;
dev->allocListHead = NULL;
pthread_mutex_init(&dev->lock, NULL);
*device = &dev->device.common;
status = 0;
}
else if (!strcmp(name, GRALLOC_HARDWARE_FB0)) {
// return error if connection with host can not be established
DEFINE_AND_VALIDATE_HOST_CONNECTION;
//
// Query the host for Framebuffer attributes
//
D("gralloc: query Frabuffer attribs\n");
EGLint width = rcEnc->rcGetFBParam(rcEnc, FB_WIDTH);
D("gralloc: width=%d\n", width);
EGLint height = rcEnc->rcGetFBParam(rcEnc, FB_HEIGHT);
D("gralloc: height=%d\n", height);
EGLint xdpi = rcEnc->rcGetFBParam(rcEnc, FB_XDPI);
D("gralloc: xdpi=%d\n", xdpi);
EGLint ydpi = rcEnc->rcGetFBParam(rcEnc, FB_YDPI);
D("gralloc: ydpi=%d\n", ydpi);
EGLint fps = rcEnc->rcGetFBParam(rcEnc, FB_FPS);
D("gralloc: fps=%d\n", fps);
EGLint min_si = rcEnc->rcGetFBParam(rcEnc, FB_MIN_SWAP_INTERVAL);
D("gralloc: min_swap=%d\n", min_si);
EGLint max_si = rcEnc->rcGetFBParam(rcEnc, FB_MAX_SWAP_INTERVAL);
D("gralloc: max_swap=%d\n", max_si);
//
// Allocate memory for the framebuffer device
//
fb_device_t *dev;
dev = (fb_device_t*)malloc(sizeof(fb_device_t));
if (NULL == dev) {
return -ENOMEM;
}
memset(dev, 0, sizeof(fb_device_t));
// Initialize our device structure
//
dev->device.common.tag = HARDWARE_DEVICE_TAG;
dev->device.common.version = 0;
dev->device.common.module = const_cast<hw_module_t*>(module);
dev->device.common.close = fb_close;
dev->device.setSwapInterval = fb_setSwapInterval;
dev->device.post = fb_post;
dev->device.setUpdateRect = 0; //fb_setUpdateRect;
dev->device.compositionComplete = fb_compositionComplete; //XXX: this is a dummy
const_cast<uint32_t&>(dev->device.flags) = 0;
const_cast<uint32_t&>(dev->device.width) = width;
const_cast<uint32_t&>(dev->device.height) = height;
const_cast<int&>(dev->device.stride) = width;
const_cast<int&>(dev->device.format) = HAL_PIXEL_FORMAT_RGBA_8888;
const_cast<float&>(dev->device.xdpi) = xdpi;
const_cast<float&>(dev->device.ydpi) = ydpi;
const_cast<float&>(dev->device.fps) = fps;
const_cast<int&>(dev->device.minSwapInterval) = min_si;
const_cast<int&>(dev->device.maxSwapInterval) = max_si;
*device = &dev->device.common;
status = 0;
}
return status;
}
//
// define the HMI symbol - our module interface
//
static struct hw_module_methods_t gralloc_module_methods = {
open: gralloc_device_open
};
struct private_module_t HAL_MODULE_INFO_SYM = {
base: {
common: {
tag: HARDWARE_MODULE_TAG,
version_major: 1,
version_minor: 0,
id: GRALLOC_HARDWARE_MODULE_ID,
name: "Graphics Memory Allocator Module",
author: "The Android Open Source Project",
methods: &gralloc_module_methods,
dso: NULL,
reserved: {0, }
},
registerBuffer: gralloc_register_buffer,
unregisterBuffer: gralloc_unregister_buffer,
lock: gralloc_lock,
unlock: gralloc_unlock,
perform: NULL,
reserved_proc : {NULL, }
}
};
/* This function is called once to detect whether the emulator supports
* GPU emulation (this is done by looking at the qemu.gles kernel
* parameter, which must be > 0 if this is the case).
*
* If not, then load gralloc.default instead as a fallback.
*/
static void
fallback_init(void)
{
char prop[PROPERTY_VALUE_MAX];
void* module;
property_get("ro.kernel.qemu.gles", prop, "0");
if (atoi(prop) > 0) {
return;
}
ALOGD("Emulator without GPU emulation detected.");
module = dlopen("/system/lib/hw/gralloc.default.so", RTLD_LAZY|RTLD_LOCAL);
if (module != NULL) {
sFallback = reinterpret_cast<gralloc_module_t*>(dlsym(module, HAL_MODULE_INFO_SYM_AS_STR));
if (sFallback == NULL) {
dlclose(module);
}
}
if (sFallback == NULL) {
ALOGE("Could not find software fallback module!?");
}
}