android - NDK OpenGL 未定义对 glVertexPointer 的引用

Question

在终端中使用 ndk-build 编译以下 C 代码时(我正在运行 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);
}

使用这个 Android.mk 文件:

   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)

我得到一个错误，对 glVertexPointer 的 undefined reference 。我想知道为什么，因为我相信我正确地包含了 header 并链接了 Android.mk 中的库

/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

谢谢!

Answer 1

我想不出有什么不对，但当我检查我的 make 文件时，发现有一处不同。由于我不擅长编译器，所以我不知道它是否相关:

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

希望对你有帮助