NDK的OpenGL未定义参考glVertexPointer [英] NDK OpenGL undefined reference to glVertexPointer

问题描述

在编译下面的C code。与NDK的构建在终端（我运行Ubuntu）：

 的#include＆LT; jni.h＆GT;＃包括LT＆; GLES / gl.h＆GT;
＃包括LT＆; GLES / glext.h＆GT;＃包括org_opengldrawinjni_DrawinJNI.h
JNIEXPORT无效JNICALL Java_org_opengldrawinjni_DrawinJNI_Draw
  （JNIEnv的* envptr，jobject jobj）
{
 GLfloat顶点[] =
  {1.0，0.0，0.0，
    1.0，1.0，0.0，
    0.0，0.0，0.0
  };
 GLubyte指数[] = {0，1，2};
 glVertexPointer（3，GL_FLOAT，0，顶点）;
 glDrawElements（GL_TRIANGLES，3，GL_UNSIGNED_BYTE，索引）;
}
 

本Android.mk文件：

  LOCAL_PATH：= $（叫我-DIR）   包括$（CLEAR_VARS）   LOCAL_MODULE：= OpenGLJNI
   LOCAL_SRC_FILES：= org_opengldrawinjni_DrawinJNI.c
   LOCAL_LDLIBS：= -llog -lGLESv1_CM.so   包括$（BUILD_SHARED_LIBRARY）
 

我得到一个错误，未定义的引用glVertexPointer。我不知道为什么，因为我相信我适当地包括报头，并在Android.mk拉上库

<$p$p><$c$c>/home/thomas/Documents/LinuxProgramming/EclipseWorkspace/OpenGLDrawinginJNI/obj/local/armeabi/objs/OpenGLJNI/org_opengldrawinjni_DrawinJNI.o:在功能上`Java_org_opengldrawinjni_DrawinJNI_Draw：
/home/thomas/Documents/LinuxProgramming/EclipseWorkspace/OpenGLDrawinginJNI/jni/org_opengldrawinjni_DrawinJNI.c:33:未定义的引用`glVertexPointer
collect2：劳工处返回1退出状态
使：*** [/home/thomas/Documents/LinuxProgramming/EclipseWorkspace/OpenGLDrawinginJNI/obj/local/armeabi/libOpenGLJNI.so]错误1

谢谢！

解决方案

我想不出什么错，但是当我检查了我的make文件有一个区别。
因为我不擅长与编译器，我不知道这是否是相关的：

LOCAL_LDLIBS：= -lGLESv1_CM -ldl -llog

  

动态链接库：

  
  

是可用的，并可用于
  使用的dlopen（）/ dlsym进行（）/ dlclose（）
  通过在Android提供的功能
  动态连接器。您将需要链接
  针对与/system/lib/libdl.so：

  
  

LOCAL_LDLIBS：= -ldl

希望它能帮助

When compiling the following C code with ndk-build in Terminal (I'm running Ubuntu):

#include <jni.h>

#include <GLES/gl.h>
#include <GLES/glext.h>

#include "org_opengldrawinjni_DrawinJNI.h"


JNIEXPORT void JNICALL Java_org_opengldrawinjni_DrawinJNI_Draw
  (JNIEnv *envptr, jobject jobj)
{
 GLfloat vertices[] =
  { 1.0, 0.0, 0.0,
    1.0, 1.0, 0.0,
    0.0, 0.0, 0.0
  };
 GLubyte indices[] = { 0, 1, 2 };
 glVertexPointer(3, GL_FLOAT, 0, vertices);
 glDrawElements(GL_TRIANGLES, 3, GL_UNSIGNED_BYTE, indices);
}

with this Android.mk file:

   LOCAL_PATH := $(call my-dir)

   include $(CLEAR_VARS)

   LOCAL_MODULE    := OpenGLJNI
   LOCAL_SRC_FILES := org_opengldrawinjni_DrawinJNI.c
   LOCAL_LDLIBS := -llog -lGLESv1_CM.so

   include $(BUILD_SHARED_LIBRARY)

I get an error, undefined reference to glVertexPointer. I'm wondering why because I believe I properly included the headers and linked up the libraries in the Android.mk

/home/thomas/Documents/LinuxProgramming/EclipseWorkspace/OpenGLDrawinginJNI/obj/local/armeabi/objs/OpenGLJNI/org_opengldrawinjni_DrawinJNI.o: In function `Java_org_opengldrawinjni_DrawinJNI_Draw':
/home/thomas/Documents/LinuxProgramming/EclipseWorkspace/OpenGLDrawinginJNI/jni/org_opengldrawinjni_DrawinJNI.c:33: undefined reference to `glVertexPointer'
collect2: ld returned 1 exit status
make: *** [/home/thomas/Documents/LinuxProgramming/EclipseWorkspace/OpenGLDrawinginJNI/obj/local/armeabi/libOpenGLJNI.so] Error 1

Thanks!

解决方案

I can't think of anything wrong but when I checked my make file there is one difference. Since I'm not good with compilers I don't know if it is relevant:

LOCAL_LDLIBS := -lGLESv1_CM -ldl -llog

Dynamic Linker Library:

is available and can be used to use the dlopen()/dlsym()/dlclose() functions provided by the Android dynamic linker. You will need to link against /system/lib/libdl.so with:

LOCAL_LDLIBS := -ldl

Hope it helps

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