Android(安卓)OpenGL ES 分析与实践(4)

由我以上图表可以看出，加载驱动的时候，会尝试先从libGLES_android.so中加载EGL、GLESV1_CM、GLESV2三个部分的函数，如

果加载失败，则会尝试从libEGL_android.so，libGLESV1_cm.so，libGLESV2.so三个动态库中对应的函数。在这部分代码中，我们可以看到一个非常重要的结构体，egl_connection_t，

struct egl_connection_t

{

void * dso;

gl_hooks_t * hooks[2];

EGLint major;

EGLint minor;

egl_t egl;

};到处都有他的身影，对这几个变量进行一下解释。

struct soinfo

{

const char name[SOINFO_NAME_LEN];

Elf32_Phdr *phdr;

int phnum;

unsigned entry;

unsigned base;

unsigned size;

// buddy-allocator index, negative for prelinked libraries

int ba_index;

unsigned *dynamic;

unsigned wrprotect_start;

unsigned wrprotect_end;

soinfo *next;

unsigned flags;

const char *strtab;

Elf32_Sym *symtab;

unsigned nbucket;

unsigned nchain;

unsigned *bucket;

unsigned *chain;

unsigned *plt_got;

Elf32_Rel *plt_rel;

unsigned plt_rel_count;

Elf32_Rel *rel;

unsigned rel_count;

unsigned *preinit_array;

unsigned preinit_array_count;

unsigned *init_array;

unsigned init_array_count;

unsigned *fini_array;

unsigned fini_array_count;

void (*init_func)(void);

void (*fini_func)(void);

#ifdef ANDROID_ARM_LINKER

/* ARM EABI section used for stack unwinding. */

unsigned *ARM_exidx;

unsigned ARM_exidx_count;

#endif

unsigned refcount;

struct link_map linkmap;

};

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