c++ - OpenGL- 'glTexSubImage3D' : identifier not found

Question

问题:我一直在尝试找出 OpenGL 中使用 glTexSubImage3D 时遇到的这个错误。 VS2010 抛出错误:glTexSubImage3D: identifier not found

用法:我正在尝试创建一个 3D 纹理，其中包含沿 z 维度放置的十个切片(图像)。它类似于这篇文章中的问题:C++ - place multiple images in an array pointer

但是，我一直在尝试使用 glTexSubImage3D 以避免这些访问冲突错误。

我在我的项目中包含了 glext.h，因为 glTexImage3D 还不是 OpenGL 库的一部分，我使用了函数指针 PFNGLTEXIMAGE3DPROC glTexImage3D 在这里使用:http://content.gpwiki.org/index.php/OpenGL:Tutorials:3D_Textures

代码:

我一直在关注 NeHe 的纹理贴图教程和体积渲染教程:http://www.codeproject.com/Articles/352270/Getting-started-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;

Answer 1

问题与您最初尝试使用 glTexImage3D (...) 时遇到的问题相同。也就是说，3D 纹理是 OpenGL 1.2 的一项功能，Windows 只为您提供没有运行时扩展的 OpenGL 1.1。

您需要加载 glTexSubImage3D (...) 函数，就像您加载 glTexImage3D (...) 一样。

PFNGLTEXSUBIMAGE3DPROC glTexSubImage3D =
 (PFNGLTEXSUBIMAGE3DPROC) wglGetProcAddress("glTexSubImage3D");