273 lines
10 KiB
C++
273 lines
10 KiB
C++
/*
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* Copyright (C) 2013 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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#define LOG_TAG "AssetAtlasService"
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#include "jni.h"
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#include "JNIHelp.h"
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#include <android_view_GraphicBuffer.h>
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#include <cutils/log.h>
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#include <GLES2/gl2.h>
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#include <GLES2/gl2ext.h>
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#include <EGL/egl.h>
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#include <EGL/eglext.h>
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#include <SkCanvas.h>
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#include <SkBitmap.h>
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namespace android {
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// ----------------------------------------------------------------------------
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// Defines
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// ----------------------------------------------------------------------------
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// Defines how long to wait for the GPU when uploading the atlas
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// This timeout is defined in nanoseconds (see EGL_KHR_fence_sync extension)
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#define FENCE_TIMEOUT 2000000000
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// ----------------------------------------------------------------------------
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// JNI Helpers
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// ----------------------------------------------------------------------------
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static struct {
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jfieldID mFinalizer;
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jfieldID mNativeCanvas;
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} gCanvasClassInfo;
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static struct {
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jfieldID mNativeCanvas;
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} gCanvasFinalizerClassInfo;
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#define GET_INT(object, field) \
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env->GetIntField(object, field)
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#define SET_INT(object, field, value) \
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env->SetIntField(object, field, value)
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// ----------------------------------------------------------------------------
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// Canvas management
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// ----------------------------------------------------------------------------
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static inline void swapCanvasPtr(JNIEnv* env, jobject canvasObj, SkCanvas* newCanvas) {
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jobject canvasFinalizerObj = env->GetObjectField(canvasObj, gCanvasClassInfo.mFinalizer);
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SkCanvas* previousCanvas = reinterpret_cast<SkCanvas*>(
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GET_INT(canvasObj, gCanvasClassInfo.mNativeCanvas));
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SET_INT(canvasObj, gCanvasClassInfo.mNativeCanvas, (int) newCanvas);
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SET_INT(canvasFinalizerObj, gCanvasFinalizerClassInfo.mNativeCanvas, (int) newCanvas);
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SkSafeUnref(previousCanvas);
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}
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static SkBitmap* com_android_server_AssetAtlasService_acquireCanvas(JNIEnv* env, jobject,
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jobject canvas, jint width, jint height) {
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SkBitmap* bitmap = new SkBitmap;
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bitmap->setConfig(SkBitmap::kARGB_8888_Config, width, height);
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bitmap->allocPixels();
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bitmap->eraseColor(0);
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SkCanvas* nativeCanvas = SkNEW_ARGS(SkCanvas, (*bitmap));
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swapCanvasPtr(env, canvas, nativeCanvas);
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return bitmap;
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}
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static void com_android_server_AssetAtlasService_releaseCanvas(JNIEnv* env, jobject,
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jobject canvas, SkBitmap* bitmap) {
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SkCanvas* nativeCanvas = SkNEW(SkCanvas);
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swapCanvasPtr(env, canvas, nativeCanvas);
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delete bitmap;
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}
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#define CLEANUP_GL_AND_RETURN(result) \
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if (fence != EGL_NO_SYNC_KHR) eglDestroySyncKHR(display, fence); \
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if (image) eglDestroyImageKHR(display, image); \
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if (texture) glDeleteTextures(1, &texture); \
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if (surface != EGL_NO_SURFACE) eglDestroySurface(display, surface); \
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if (context != EGL_NO_CONTEXT) eglDestroyContext(display, context); \
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eglMakeCurrent(display, EGL_NO_SURFACE, EGL_NO_SURFACE, EGL_NO_CONTEXT); \
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eglReleaseThread(); \
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eglTerminate(display); \
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return result;
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static jboolean com_android_server_AssetAtlasService_upload(JNIEnv* env, jobject,
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jobject graphicBuffer, SkBitmap* bitmap) {
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// The goal of this method is to copy the bitmap into the GraphicBuffer
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// using the GPU to swizzle the texture content
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sp<GraphicBuffer> buffer(graphicBufferForJavaObject(env, graphicBuffer));
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if (buffer != NULL) {
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EGLDisplay display = eglGetDisplay(EGL_DEFAULT_DISPLAY);
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if (display == EGL_NO_DISPLAY) return false;
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EGLint major;
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EGLint minor;
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if (!eglInitialize(display, &major, &minor)) {
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ALOGW("Could not initialize EGL");
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return false;
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}
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// We're going to use a 1x1 pbuffer surface later on
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// The configuration doesn't really matter for what we're trying to do
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EGLint configAttrs[] = {
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EGL_RENDERABLE_TYPE, EGL_OPENGL_ES2_BIT,
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EGL_RED_SIZE, 8,
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EGL_GREEN_SIZE, 8,
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EGL_BLUE_SIZE, 8,
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EGL_ALPHA_SIZE, 0,
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EGL_DEPTH_SIZE, 0,
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EGL_STENCIL_SIZE, 0,
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EGL_NONE
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};
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EGLConfig configs[1];
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EGLint configCount;
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if (!eglChooseConfig(display, configAttrs, configs, 1, &configCount)) {
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ALOGW("Could not select EGL configuration");
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eglReleaseThread();
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eglTerminate(display);
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return false;
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}
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if (configCount <= 0) {
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ALOGW("Could not find EGL configuration");
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eglReleaseThread();
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eglTerminate(display);
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return false;
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}
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// These objects are initialized below but the default "null"
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// values are used to cleanup properly at any point in the
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// initialization sequence
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GLuint texture = 0;
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EGLImageKHR image = EGL_NO_IMAGE_KHR;
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EGLSurface surface = EGL_NO_SURFACE;
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EGLSyncKHR fence = EGL_NO_SYNC_KHR;
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EGLint attrs[] = { EGL_CONTEXT_CLIENT_VERSION, 2, EGL_NONE };
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EGLContext context = eglCreateContext(display, configs[0], EGL_NO_CONTEXT, attrs);
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if (context == EGL_NO_CONTEXT) {
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ALOGW("Could not create EGL context");
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CLEANUP_GL_AND_RETURN(false);
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}
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// Create the 1x1 pbuffer
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EGLint surfaceAttrs[] = { EGL_WIDTH, 1, EGL_HEIGHT, 1, EGL_NONE };
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surface = eglCreatePbufferSurface(display, configs[0], surfaceAttrs);
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if (surface == EGL_NO_SURFACE) {
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ALOGW("Could not create EGL surface");
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CLEANUP_GL_AND_RETURN(false);
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}
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if (!eglMakeCurrent(display, surface, surface, context)) {
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ALOGW("Could not change current EGL context");
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CLEANUP_GL_AND_RETURN(false);
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}
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// We use an EGLImage to access the content of the GraphicBuffer
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// The EGL image is later bound to a 2D texture
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EGLClientBuffer clientBuffer = (EGLClientBuffer) buffer->getNativeBuffer();
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EGLint imageAttrs[] = { EGL_IMAGE_PRESERVED_KHR, EGL_TRUE, EGL_NONE };
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image = eglCreateImageKHR(display, EGL_NO_CONTEXT,
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EGL_NATIVE_BUFFER_ANDROID, clientBuffer, imageAttrs);
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if (image == EGL_NO_IMAGE_KHR) {
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ALOGW("Could not create EGL image");
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CLEANUP_GL_AND_RETURN(false);
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}
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glGenTextures(1, &texture);
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glBindTexture(GL_TEXTURE_2D, texture);
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glEGLImageTargetTexture2DOES(GL_TEXTURE_2D, image);
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if (glGetError() != GL_NO_ERROR) {
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ALOGW("Could not create/bind texture");
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CLEANUP_GL_AND_RETURN(false);
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}
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// Upload the content of the bitmap in the GraphicBuffer
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glPixelStorei(GL_UNPACK_ALIGNMENT, bitmap->bytesPerPixel());
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glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, bitmap->width(), bitmap->height(),
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GL_RGBA, GL_UNSIGNED_BYTE, bitmap->getPixels());
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if (glGetError() != GL_NO_ERROR) {
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ALOGW("Could not upload to texture");
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CLEANUP_GL_AND_RETURN(false);
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}
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// The fence is used to wait for the texture upload to finish
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// properly. We cannot rely on glFlush() and glFinish() as
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// some drivers completely ignore these API calls
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fence = eglCreateSyncKHR(display, EGL_SYNC_FENCE_KHR, NULL);
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if (fence == EGL_NO_SYNC_KHR) {
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ALOGW("Could not create sync fence %#x", eglGetError());
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CLEANUP_GL_AND_RETURN(false);
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}
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// The flag EGL_SYNC_FLUSH_COMMANDS_BIT_KHR will trigger a
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// pipeline flush (similar to what a glFlush() would do.)
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EGLint waitStatus = eglClientWaitSyncKHR(display, fence,
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EGL_SYNC_FLUSH_COMMANDS_BIT_KHR, FENCE_TIMEOUT);
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if (waitStatus != EGL_CONDITION_SATISFIED_KHR) {
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ALOGW("Failed to wait for the fence %#x", eglGetError());
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CLEANUP_GL_AND_RETURN(false);
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}
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CLEANUP_GL_AND_RETURN(true);
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}
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return false;
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}
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// ----------------------------------------------------------------------------
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// JNI Glue
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// ----------------------------------------------------------------------------
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#define FIND_CLASS(var, className) \
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var = env->FindClass(className); \
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LOG_FATAL_IF(! var, "Unable to find class " className);
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#define GET_FIELD_ID(var, clazz, fieldName, fieldDescriptor) \
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var = env->GetFieldID(clazz, fieldName, fieldDescriptor); \
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LOG_FATAL_IF(! var, "Unable to find field " fieldName);
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const char* const kClassPathName = "com/android/server/AssetAtlasService";
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static JNINativeMethod gMethods[] = {
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{ "nAcquireAtlasCanvas", "(Landroid/graphics/Canvas;II)I",
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(void*) com_android_server_AssetAtlasService_acquireCanvas },
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{ "nReleaseAtlasCanvas", "(Landroid/graphics/Canvas;I)V",
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(void*) com_android_server_AssetAtlasService_releaseCanvas },
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{ "nUploadAtlas", "(Landroid/view/GraphicBuffer;I)Z",
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(void*) com_android_server_AssetAtlasService_upload },
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};
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int register_android_server_AssetAtlasService(JNIEnv* env) {
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jclass clazz;
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FIND_CLASS(clazz, "android/graphics/Canvas");
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GET_FIELD_ID(gCanvasClassInfo.mFinalizer, clazz, "mFinalizer",
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"Landroid/graphics/Canvas$CanvasFinalizer;");
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GET_FIELD_ID(gCanvasClassInfo.mNativeCanvas, clazz, "mNativeCanvas", "I");
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FIND_CLASS(clazz, "android/graphics/Canvas$CanvasFinalizer");
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GET_FIELD_ID(gCanvasFinalizerClassInfo.mNativeCanvas, clazz, "mNativeCanvas", "I");
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return jniRegisterNativeMethods(env, kClassPathName, gMethods, NELEM(gMethods));
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}
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};
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