Android 使用opengles部分记录

关于旋转和旋转轴

参考：Android使用OpenGL ES 3.0实现随手指旋转3D立方体

glm库

https://github.com/g-truc/glm

下载 https://github.com/g-truc/glm/releases/download/0.9.9.8/glm-0.9.9.8.zip

使用

新建一个cpp项目或者module

解压glm 把 glm拷贝到include目录

配置CMakeLists.txt

使用

#include <jni.h>
#include <string>
#include <android/log.h>

#include <glm/glm.hpp>
#include <glm/gtc/matrix_transform.hpp>
#include <glm/gtc/type_ptr.hpp>

#define TAG "GLM-JNI-TAG"
#define LOGD(...) __android_log_print(ANDROID_LOG_DEBUG,TAG , __VA_ARGS__);
#define LOGE(...) __android_log_print(ANDROID_LOG_ERROR,TAG , __VA_ARGS__);
#define LOGI(...) __android_log_print(ANDROID_LOG_INFO,TAG , __VA_ARGS__);extern "C"
JNIEXPORT jfloatArray JNICALL
Java_com_xx_libglm_GlmLib_cross(JNIEnv *env, jobject thiz, jfloat x, jfloat y, jfloat z,
                                  jfloat x2, jfloat y2, jfloat z2) {
    glm::vec3 cross = glm::cross(glm::vec3(x,y,z), glm::vec3(x2,y2, z2));
    jfloatArray result = env->NewFloatArray(3);
    float* data = glm::value_ptr(cross);
    env->SetFloatArrayRegion(result,0,3,data);
    return result;
}

Java

public class GlmLib {

    // Used to load the 'libglm' library on application startup.
    static {
        System.loadLibrary("libglm");
    }

    /**
     * A native method that is implemented by the 'libglm' native library,
     * which is packaged with this application.
     */
    public native String stringFromJNI();

    public native float[] cross(float x,float y, float z,float x2,float y2,float z2);
}