OpenGL各向异性过滤支持，矛盾的检查结果 [英] OpenGL anisotropic filtering support, contradictory check results

问题描述

当检查是否支持各向异性过滤时，我得到矛盾的结果.

When checking if anisotropic filtering is supported, I get contradictory results.

if(glewIsSupported("GL_EXT_texture_filter_anisotropic") || GLEW_EXT_texture_filter_anisotropic) {
        std::cout << "support anisotropic" << std::endl;
    }

GLfloat max;
glGetFloatv(GL_MAX_TEXTURE_MAX_ANISOTROPY_EXT, &max);
std::cout << max << std::endl;

此部分在我的计算机上的输出为:

The output for this section on my machine is:

16

表面上似乎支持16的各向异性过滤，但是glewIsSupported和glew扩展字符串却相反.

So seemingly an anisotropic filtering of 16 is supported, but glewIsSupported as well as the glew extension string say the opposite.

检查GL_MAX_TEXTURE_MAX_ANISOTROPY_EXT是否足够，毛刺检查是否错误，或者发生了什么不同?

Is checking for GL_MAX_TEXTURE_MAX_ANISOTROPY_EXT enough and is the glew check wrong, or is something different going on?

推荐答案

显然有一个

Apparently there is a known bug in glew where glGetString(GL_EXTENSIONS) is used even in an OpenGL 3+ context instead of glGetStringi that replaced the extension querying in OpenGL 3+.

因此，在修补之前，必须先手动完成扩展查询.

So until patched, extension querying must be done manually.

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