Question

我不确定cubmap的无缝效果。我所知道的是，使用此功能，边缘处的两条边之间会有平滑的颜色变化。

所以，我在每个面上渲染一个8 * 8纹理的立方体，我在glTexImage2D（）调用之前调用glEnable（GL_TEXTURE_CUBE_MAP_SEAMLESS）。但我没有看到通过添加上面的glEnable调用输出的任何差异。我期待立方体的边缘有平滑的颜色变化。我正在使用GL_CLAMP_TO_EDGE模式进行包装，使用GL_NEAREST进行缩小和放大过滤。

代码：

    GLbyte subpix[]={0, 0, 0, 127,     127,127,127, 127,  127,0,127,127,  0,127,0,127, 0, 127, 127, 127,  127,127,127, 127,   0,0,0,127,  127,127,0,127, 127, 0, 0, 127,
                            0, 127, 127, 127,  127,127,127, 127,   0,0,0,127,  127,127,0,127, 0, 0, 0, 127,    127,127,127, 127,  127,0,0,127,  0,127,0,127, 127,127,0,127,
                            0, 0, 0, 127,    127,127,127, 127,  127,0,0,127,  0,127,0,127, 0, 0, 0, 127,     127,127,127, 127,  127,0,127,127, 56, 32, 54, 127,
                            0, 127, 127, 127,  127,127,127, 127,   127,0,0,127,  0,127,0,127, 127, 0, 0, 127,    0,127,127, 127,  0,0,0,127,  127,127,0,127, 54, 100, 12,127,
                            127, 0, 0, 127,    0,127,127, 127,  0,0,0,127,  127,127,0,127, 56, 32, 54, 127,  54, 100, 12,127,  123,54, 12, 127,  32, 127, 23, 127, 21, 90, 111,127,
                        0, 127, 127, 127,  127,127,0, 127,    127,0,0,127,  0,127,0,127,  127, 0, 0, 127,    0,127,127, 127 , 54, 100, 12,127, 56, 32, 54, 127
        };  

  *target11=GL_TEXTURE_CUBE_MAP;

        glGenTextures(1, &textureId);
        nResult |= GL_ERROR_CHECK((GL_NO_ERROR, "glGenTextures(1, &textureId);"));      


        glBindTexture(*target11, textureId);
        glEnable(GL_TEXTURE_CUBE_MAP_SEAMLESS);

        for(int i=0;i<6;i++)
        {
        glTexImage2D(GL_TEXTURE_CUBE_MAP_POSITIVE_X+i, 0, GL_RGBA16_SNORM, 7 ,7, 0, GL_RGBA, GL_BYTE,subpix);
        nResult |= GL_ERROR_CHECK((GL_NO_ERROR, "glTexImage2D(types[i], 0, *format, 7 ,7, 0, GL_RGBA, GL_UNSIGNED_BYTE,pix31);"));
            }   

        glTexParameteri(*target11, GL_TEXTURE_MIN_FILTER,GL_NEAREST);
        nResult |= GL_ERROR_CHECK((GL_NO_ERROR, "glTexParameteri(*target11, GL_TEXTURE_MIN_FILTER,GL_NEAREST);"));

         glTexParameteri(*target11, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
         nResult |= GL_ERROR_CHECK((GL_NO_ERROR, "glTexParameteri(*target11, GL_TEXTURE_MAG_FILTER, GL_NEAREST);"));

         glTexParameteri(*target11, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
    nResult |= GL_ERROR_CHECK((GL_NO_ERROR, "glTexParameteri(*target11, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);"));

    glTexParameteri(*target11, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
            nResult |= GL_ERROR_CHECK((GL_NO_ERROR, "glTexParameteri(*target11, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);"));
    glEnable(GL_DEPTH_TEST);

让我知道我哪里出错了。

Answer 1

和GL_NEAREST用于缩小和放大过滤。

你正在使用点抽样;你明确地询问每个纹素之间的接缝。所以没有什么是无缝的。

无缝立方体贴图就是在立方体的面之间进行过滤。你根本没有做过滤，所以你没有使用无缝的立方体贴图。

关于无缝幼崽地图纹理

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