使用cle 调用opengl的简单例子(android)

   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