OpenGL - 'glTexSubImage3D'：找不到标识符

问题：我一直在尝试在openGL中弄清楚这个错误，我一直在使用glTexSubImage3D遇到的错误。VS2010引发错误：glTexSubImage3D: identifier not found

用法：我正在尝试创建一个3D纹理，并沿着Z-Dimension放置十片（图像）。它类似于本文中的问题：C - 将多个图像放在数组指针中

但是，我一直在尝试使用gltexsubimage3d，以避免这些访问违规错误。

我已经在项目中包含了glext.h，并且由于glTexImage3D尚未属于OpenGL库的一部分，因此我使用了函数指针PFNGLTEXIMAGE3DPROC glTexImage3D，以便在此处使用：http：//content.gpwiki.org/index.php/opengl：教程：3D_Textures

代码：

我一直在关注Nehe的纹理映射教程和卷渲染教程：http：//www.codeproject.com/articles/352270/getting-with-with-with-with-volume-rendering?msg = 4729498

GLuint m_nTexId;            
unsigned char *tex;
int h = 1024;               
int w = 256;
int slices = 10;
PFNGLTEXIMAGE3DPROC glTexImage3D = (PFNGLTEXIMAGE3DPROC) wglGetProcAddress("glTexImage3D");
int LoadGLTextures()                                    
{
    glGenTextures(1,(GLuint*)&m_nTexId );
    if(m_nTexId == 0)
    return false;
    glBindTexture( GL_TEXTURE_3D, m_nTexId );
    glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
    glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_BORDER);
    glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_BORDER);
    glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_WRAP_R, GL_CLAMP_TO_BORDER);
    glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
    glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);

    glTexImage3D(GL_TEXTURE_3D, 0, GL_RGBA, w, h , slices, 0, GL_RGBA, GL_UNSIGNED_BYTE, NULL );
    tex = (unsigned char *)SOIL_load_image("Data/PA_170090.png", &w, &h, NULL, 0);
    glTexSubImage3D(GL_TEXTURE_3D, 0, 0, 0, 0, h, w, 1, GL_RGBA, GL_UNSIGNED_BYTE, (GLvoid*) tex);
    tex = (unsigned char*) SOIL_load_image("Data/PA_170091.png", &w, &h, NULL, 0);
    glTexSubImage3D(GL_TEXTURE_3D, 0, 0, 0, 1, h, w, 1, GL_RGBA, GL_UNSIGNED_BYTE, (GLvoid*) tex);
    tex = (unsigned char *)SOIL_load_image("Data/PA_170092.png", &w, &h, NULL, 0);
    glTexSubImage3D(GL_TEXTURE_3D, 0, 0, 0, 2, h, w, 1, GL_RGBA, GL_UNSIGNED_BYTE, (GLvoid*) tex);
    tex = (unsigned char *)SOIL_load_image("Data/PA_170093.png", &w, &h, NULL, 0);
    glTexSubImage3D(GL_TEXTURE_3D, 0, 0, 0, 3, h, w, 1, GL_RGBA, GL_UNSIGNED_BYTE, (GLvoid*) tex);
    tex = (unsigned char *)SOIL_load_image("Data/PA_170094.png", &w, &h, NULL, 0);
    glTexSubImage3D(GL_TEXTURE_3D, 0, 0, 0, 4, h, w, 1, GL_RGBA, GL_UNSIGNED_BYTE, (GLvoid*) tex);
    tex = (unsigned char *)SOIL_load_image("Data/PA_170095.png", &w, &h, NULL, 0);
    glTexSubImage3D(GL_TEXTURE_3D, 0, 0, 0, 5, h, w, 1, GL_RGBA, GL_UNSIGNED_BYTE, (GLvoid*) tex);
    tex = (unsigned char*) SOIL_load_image("Data/PA_170096.png", &w, &h, NULL, 0);
    glTexSubImage3D(GL_TEXTURE_3D, 0, 0, 0, 6, h, w, 1, GL_RGBA, GL_UNSIGNED_BYTE, (GLvoid*) tex);
    tex = (unsigned char*) SOIL_load_image("Data/PA_170097.png", &w, &h, NULL, 0);
    glTexSubImage3D(GL_TEXTURE_3D, 0, 0, 0, 7, h, w, 1, GL_RGBA, GL_UNSIGNED_BYTE, (GLvoid*) tex);
    tex = (unsigned char*) SOIL_load_image("Data/PA_170098.png", &w, &h, NULL, 0);
    glTexSubImage3D(GL_TEXTURE_3D, 0, 0, 0, 8, h, w, 1, GL_RGBA, GL_UNSIGNED_BYTE, (GLvoid*) tex);
    tex = (unsigned char*) SOIL_load_image("Data/PA_170099.png", &w, &h, NULL, 0);
    glTexSubImage3D(GL_TEXTURE_3D, 0, 0, 0, 9, h, w, 1, GL_RGBA, GL_UNSIGNED_BYTE, (GLvoid*) tex);
//glBindTexture( GL_TEXTURE_3D, 0 );
    return true;

}