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/*
* Copyright 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 <pthread.h>
extern "C" {
#include "liblzf/lzf.h"
}
#include "gltrace_context.h"
namespace android {
namespace gltrace {
using ::android::gl_hooks_t;
static pthread_key_t sTLSKey = -1;
static pthread_once_t sPthreadOnceKey = PTHREAD_ONCE_INIT;
void createTLSKey() {
pthread_key_create(&sTLSKey, NULL);
}
GLTraceContext *getGLTraceContext() {
return (GLTraceContext*) pthread_getspecific(sTLSKey);
}
void setGLTraceContext(GLTraceContext *c) {
pthread_setspecific(sTLSKey, c);
}
void initContext(unsigned version, gl_hooks_t *hooks) {
pthread_once(&sPthreadOnceKey, createTLSKey);
GLTraceContext *context = new GLTraceContext();
context->hooks = hooks;
setGLTraceContext(context);
}
void releaseContext() {
GLTraceContext *c = getGLTraceContext();
if (c != NULL) {
delete c;
setGLTraceContext(NULL);
}
}
GLTraceContext::GLTraceContext() {
fbcontents = fbcompressed = NULL;
fbcontentsSize = 0;
}
void GLTraceContext::resizeFBMemory(unsigned minSize) {
if (fbcontentsSize >= minSize) {
return;
}
if (fbcontents != NULL) {
free(fbcontents);
free(fbcompressed);
}
fbcontents = malloc(minSize);
fbcompressed = malloc(minSize);
fbcontentsSize = minSize;
}
/** obtain a pointer to the compressed framebuffer image */
void GLTraceContext::getCompressedFB(void **fb, unsigned *fbsize, unsigned *fbwidth,
unsigned *fbheight, FBBinding fbToRead) {
int viewport[4] = {};
hooks->gl.glGetIntegerv(GL_VIEWPORT, viewport);
unsigned fbContentsSize = viewport[2] * viewport[3] * 4;
resizeFBMemory(fbContentsSize);
// switch current framebuffer binding if necessary
GLint currentFb = -1;
bool fbSwitched = false;
if (fbToRead != CURRENTLY_BOUND_FB) {
hooks->gl.glGetIntegerv(GL_FRAMEBUFFER_BINDING, ¤tFb);
if (currentFb != 0) {
hooks->gl.glBindFramebuffer(GL_FRAMEBUFFER, 0);
fbSwitched = true;
}
}
hooks->gl.glReadPixels(viewport[0], viewport[1], viewport[2], viewport[3],
GL_RGBA, GL_UNSIGNED_BYTE, fbcontents);
// switch back to previously bound buffer if necessary
if (fbSwitched) {
hooks->gl.glBindFramebuffer(GL_FRAMEBUFFER, currentFb);
}
*fbsize = lzf_compress(fbcontents, fbContentsSize, fbcompressed, fbContentsSize);
*fb = fbcompressed;
*fbwidth = viewport[2];
*fbheight = viewport[3];
}
}; // namespace gltrace
}; // namespace android
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