emulator: opengl: Back-port GLES emulation from the master tree.

The modules here are only built when BUILD_EMULATOR_OPENGL is defined to true
in your environment or your BoardConfig.mk (see tools/emulator/opengl/Android.mk)

Change-Id: I5f32c35b4452fb5a7b4d5f9fc5870ec1da6032e6

tools/emulator/opengl/system/OpenglSystemCommon/QemuPipeStream.cpp

@@ -0,0 +1,190 @@
+/*
+* 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 "QemuPipeStream.h"
+#include <hardware/qemu_pipe.h>
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
+
+QemuPipeStream::QemuPipeStream(size_t bufSize) :
+    IOStream(bufSize),
+    m_sock(-1),
+    m_bufsize(bufSize),
+    m_buf(NULL)
+{
+}
+
+QemuPipeStream::QemuPipeStream(int sock, size_t bufSize) :
+    IOStream(bufSize),
+    m_sock(sock),
+    m_bufsize(bufSize),
+    m_buf(NULL)
+{
+}
+
+QemuPipeStream::~QemuPipeStream()
+{
+    if (m_sock >= 0) {
+        ::close(m_sock);
+    }
+    if (m_buf != NULL) {
+        free(m_buf);
+    }
+}
+
+
+int QemuPipeStream::connect(void)
+{
+    m_sock = qemu_pipe_open("opengles");
+    if (!valid()) return -1;
+    return 0;
+}
+
+void *QemuPipeStream::allocBuffer(size_t minSize)
+{
+    size_t allocSize = (m_bufsize < minSize ? minSize : m_bufsize);
+    if (!m_buf) {
+        m_buf = (unsigned char *)malloc(allocSize);
+    }
+    else if (m_bufsize < allocSize) {
+        unsigned char *p = (unsigned char *)realloc(m_buf, allocSize);
+        if (p != NULL) {
+            m_buf = p;
+            m_bufsize = allocSize;
+        } else {
+            ERR("realloc (%d) failed\n", allocSize);
+            free(m_buf);
+            m_buf = NULL;
+            m_bufsize = 0;
+        }
+    }
+
+    return m_buf;
+};
+
+int QemuPipeStream::commitBuffer(size_t size)
+{
+    return writeFully(m_buf, size);
+}
+
+int QemuPipeStream::writeFully(const void *buf, size_t len)
+{
+    //DBG(">> QemuPipeStream::writeFully %d\n", len);
+    if (!valid()) return -1;
+
+    size_t res = len;
+    int retval = 0;
+
+    while (res > 0) {
+        ssize_t stat = ::write(m_sock, (const char *)(buf) + (len - res), res);
+        if (stat > 0) {
+            res -= stat;
+            continue;
+        }
+        if (stat == 0) { /* EOF */
+            ERR("QemuPipeStream::writeFully failed: premature EOF\n");
+            retval = -1;
+            break;
+        }
+        if (errno == EINTR) {
+            continue;
+        }
+        retval =  stat;
+        ERR("QemuPipeStream::writeFully failed: %s\n", strerror(errno));
+        break;
+    }
+    //DBG("<< QemuPipeStream::writeFully %d\n", len );
+    return retval;
+}
+
+const unsigned char *QemuPipeStream::readFully(void *buf, size_t len)
+{
+    //DBG(">> QemuPipeStream::readFully %d\n", len);
+    if (!valid()) return NULL;
+    if (!buf) {
+        if (len>0) ERR("QemuPipeStream::readFully failed, buf=NULL, len %d", len);
+        return NULL;  // do not allow NULL buf in that implementation
+    }
+    size_t res = len;
+    while (res > 0) {
+        ssize_t stat = ::read(m_sock, (char *)(buf) + len - res, len);
+        if (stat == 0) {
+            // client shutdown;
+            return NULL;
+        } else if (stat < 0) {
+            if (errno == EINTR) {
+                continue;
+            } else {
+                ERR("QemuPipeStream::readFully failed (buf %p): %s\n",
+                    buf, strerror(errno));
+                return NULL;
+            }
+        } else {
+            res -= stat;
+        }
+    }
+    //DBG("<< QemuPipeStream::readFully %d\n", len);
+    return (const unsigned char *)buf;
+}
+
+const unsigned char *QemuPipeStream::read( void *buf, size_t *inout_len)
+{
+    //DBG(">> QemuPipeStream::read %d\n", *inout_len);
+    if (!valid()) return NULL;
+    if (!buf) {
+      ERR("QemuPipeStream::read failed, buf=NULL");
+      return NULL;  // do not allow NULL buf in that implementation
+    }
+
+    int n = recv(buf, *inout_len);
+
+    if (n > 0) {
+        *inout_len = n;
+        return (const unsigned char *)buf;
+    }
+
+    //DBG("<< QemuPipeStream::read %d\n", *inout_len);
+    return NULL;
+}
+
+int QemuPipeStream::recv(void *buf, size_t len)
+{
+    if (!valid()) return int(ERR_INVALID_SOCKET);
+    char* p = (char *)buf;
+    int ret = 0;
+    while(len > 0) {
+        int res = ::read(m_sock, p, len);
+        if (res > 0) {
+            p += res;
+            ret += res;
+            len -= res;
+            continue;
+        }
+        if (res == 0) { /* EOF */
+             break;
+        }
+        if (errno == EINTR)
+            continue;
+
+        /* A real error */
+        if (ret == 0)
+            ret = -1;
+        break;
+    }
+    return ret;
+}