D3D9和OpenGL加载纹理图片的API是哪个？

D3D9

创建一个空纹理，当返回 S_OK 且 ppTexture 纹理对象指针不为 NULL 时，则表示该函数调用成功。

HRESULT D3DXCreateTexture(
  _In_  LPDIRECT3DDEVICE9  pDevice,
  _In_  UINT               Width,
  _In_  UINT               Height,
  _In_  UINT               MipLevels,
  _In_  DWORD              Usage,
  _In_  D3DFORMAT          Format,
  _In_  D3DPOOL            Pool,
  _Out_ LPDIRECT3DTEXTURE9 *ppTexture
);

HRESULT D3DXCreateTextureFromFileInMemory(
  _In_  LPDIRECT3DDEVICE9  pDevice,
  _In_  LPCVOID            pSrcData,
  _In_  UINT               SrcDataSize,
  _Out_ LPDIRECT3DTEXTURE9 *ppTexture
);

HRESULT D3DXCreateTextureFromFileInMemoryEx(
  _In_    LPDIRECT3DDEVICE9  pDevice,
  _In_    LPCVOID            pSrcData,
  _In_    UINT               SrcDataSize,
  _In_    UINT               Width,
  _In_    UINT               Height,
  _In_    UINT               MipLevels,
  _In_    DWORD              Usage,
  _In_    D3DFORMAT          Format,
  _In_    D3DPOOL            Pool,
  _In_    DWORD              Filter,
  _In_    DWORD              MipFilter,
  _In_    D3DCOLOR           ColorKey,
  _Inout_ D3DXIMAGE_INFO     *pSrcInfo,
  _Out_   PALETTEENTRY       *pPalette,
  _Out_   LPDIRECT3DTEXTURE9 *ppTexture
);

在 D3DXCreateTextureFromFileInMemory 和 D3DXCreateTextureFromFileInMemoryEx 函数下断（注意看纹理对象指针 ppTexture 是否和上面创建的纹理对象是否一致），一般就可以把内存中的图像保存下来了。上面三个函数参数具体含义，请自行查看 https://docs.microsoft.com/zh-cn/windows/desktop/api/_direct3d9/ 官网。

OpenGL

void glGetTexImage(
        GLenum target,
 	GLint level,
 	GLenum format,
 	GLenum type,
 	GLvoid * pixels
);

void glGetnTexImage(
        GLenum target,
 	GLint level,
 	GLenum format,
 	GLenum type,
 	GLsizei bufSize,
 	void *pixels
);

void glGetTextureImage(
         GLuint texture,
 	GLint level,
 	GLenum format,
 	GLenum type,
 	GLsizei bufSize,
 	void *pixels
);

具体参数请自行参考OPENGL API：https://www.khronos.org/registry/OpenGL-Refpages/gl4/