使用cle 调用opengl的简单例子(android)

最新推荐文章于 2021-01-14 01:30:00 发布

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#android #jni #null #class #java #module

本文介绍了一种利用Common Language Extension (CLE)简化OpenGL调用的方法。通过CLE，开发者无需深入理解JNI即可轻松实现Java调用Native共享库。文章提供了一个具体的例子，展示了如何通过CLE在Android上设置和渲染OpenGL，并提供了相关代码片段。

使用Using common language extension(cle)作为接口组件,编程能够得到很大简化.下面是一个调用opengl的例子,是从ndk example hello-gl2.修改而来,主要是说明cle的调用方法.

c 代码如下:

++ #include "vsopenapi.h"

…

-- bool setupGraphics(int w, int h) {

++ bool setupGraphics(void *object,int w, int h) {

…

}

-- void renderFrame() {

++ void renderFrame(void *object) {

…

}

-- extern "C" {

-- JNIEXPORT void JNICALL Java_com_android_gl2jni_GL2JNILib_init(JNIEnv * env, jobject obj, jint width, jint height);

-- JNIEXPORT void JNICALL Java_com_android_gl2jni_GL2JNILib_step(JNIEnv * env, jobject obj);

--};

-- JNIEXPORT void JNICALL Java_com_android_gl2jni_GL2JNILib_init(JNIEnv * env, jobject obj, jint width, jint height)

-- {

-- setupGraphics(width, height);

-- }

-- JNIEXPORT void JNICALL Java_com_android_gl2jni_GL2JNILib_step(JNIEnv * env, jobject obj)

-- {

-- renderFrame();

-- }

++ VS_BOOL StarCoreService_Init(class ClassOfStarCore *starcore)

++ {

++ void *AtomicClass,*step_AtomicFunction,*init_AtomicFunction;

++ class ClassOfBasicSRPInterface *BasicSRPInterface;

++ class ClassOfSRPInterface *SRPInterface;

++ //--init star core

++ BasicSRPInterface = starcore ->GetBasicInterface();

++ SRPInterface = BasicSRPInterface ->GetSRPInterface(BasicSRPInterface->QueryActiveService(NULL),"","");

++ //---Create Atomic Class, for define function, no attribute

++ AtomicClass = SRPInterface ->CreateAtomicObjectSimple("TestItem","GLTestClass",NULL,NULL,NULL);

++ step_AtomicFunction = SRPInterface ->CreateAtomicFunctionSimple(AtomicClass,"step","void step();",NULL,NULL,VS_FALSE,VS_FALSE);

++ init_AtomicFunction = SRPInterface ->CreateAtomicFunctionSimple(AtomicClass,"init","VS_BOOL init(VS_INT32 width,VS_INT32 height);",NULL,NULL,VS_FALSE,VS_FALSE);

++ //---Set Function Address

++ SRPInterface -> SetAtomicFunction(init_AtomicFunction,(void *)setupGraphics);

++ SRPInterface -> SetAtomicFunction(step_AtomicFunction,(void *)renderFrame);

++ SRPInterface -> Release();

++ return VS_TRUE;

++ }

++ void StarCoreService_Term(class ClassOfStarCore *starcore)

++ {

++ return;

++ }

Android.mk：

LOCAL_PATH := $(call my-dir)

include $(CLEAR_VARS)

# Here we give our module name and sourcefile(s)

LOCAL_CFLAGS += -Wno-write-strings -DENV_ANDROID

LOCAL_CPPFLAGS += -Wno-write-strings -fexceptions -DENV_ANDROID

LOCAL_LDFLAGS += -Wno-write-strings -DENV_ANDROID

LOCAL_C_INCLUDES += ../../../../../android/workspace/include

#--------source file

MODULE_CXXSRCS := gl_code.cpp

LOCAL_SRC_FILES := ${MODULE_CXXSRCS}

LOCAL_LDLIBS := ../../../../../android/workspace/libs/armeabi/libstarlib.a -llog -lGLESv2

LOCAL_MODULE := gltest

include $(BUILD_SHARED_LIBRARY)

java代码如下:

…

++ import com.srplab.www.starcore.*;

…

class GL2JNIView extends GLSurfaceView {

…

++ StarCoreFactory starcore;

++ static StarObjectClass GlObject;

…

private void init(boolean translucent, int depth, int stencil) {

…

++ StarCoreFactory starcore= StarCoreFactory.GetFactory();

++ StarServiceClass Service=starcore._InitSimple("test","123",0,0,"");

++ Service._CheckPassword(false);

++ Service._DoFile("","/data/data/com.srplabgl.gltest/lib/libgltest.so","");

++ GlObject = Service._GetObject("GLTestClass")._New();

…

}

…

private static class Renderer implements GLSurfaceView.Renderer {

public void onDrawFrame(GL10 gl) {

++ GlObject._Call("step");

}

public void onSurfaceChanged(GL10 gl, int width, int height) {

++ GlObject._Call("init",width,height);

}

public void onSurfaceCreated(GL10 gl, EGLConfig config) {

// Do nothing.

}

}

example code can be downloaded from : http://www.srplab.com/android/gltest.rar

在比较简单的场景下,使用JNI可以容易实现.但在复杂的应用中,就需要程序员自行维护各种引用,回调,进行参数转换. 这些都使得编程工作变得比较复杂. 使用cle能够简化该过程,程序员可以不需要了解JNI,就可以使用java调用native共享库.

下面的图片为anti-grain geomet在android上的一个封装,基于cle. 不久将会发布

更多关于CLE的信息,请访问 http://code.google.com/p/cle-for-android