OpenGL透视投影裁剪多边形，顶点在视锥外=错误的纹理映射?

To solve this one via a workaround, I was able to take the dimensions of my original square and instead create a grid array of textured squares so that all polygons end up being small enough to 'fit' close enough to the viewing area (or alternatively be completely clipped, avoiding the bug behavior). Code in C++:

// measurements we will add as we move along the grid
float tile_size = 1.0 / num_grid_subdivisions; // square width 1
float tile_uv_dist = 1.0 / num_grid_subdivisions; // assume 0->1 texture mapping
XY curr_bl = XY(-0.5, -0.5); // quad from -0.5 to 0.5 in x and y (1x1)
float cu = 0; //current texture coordinates in x dimension
float cv = 0; //current texture coordinates in y dimension
for (int row = 0; row < num_grid_subdivisions; ++row)
{
        for (int row_item = 0; row_item < num_grid_subdivisions; ++row_item)
        {
            // GL_TRIANGLES to keep simple, but could use STRIP later
            VertXYUV bl(curr_bl, cu, cv); // bottomleft
            // if we know bottomleft, we know the rest of the points of the square
            VertXYUV tl(XY(curr_bl.x, curr_bl.y + tile_size), cu, cv + tile_uv_dist);
            VertXYUV br(XY(curr_bl.x + tile_size, curr_bl.y), cu+ tile_uv_dist, cv );
            VertXYUV tr(XY(curr_bl.x + tile_size, curr_bl.y + tile_size),
            cu + tile_uv_dist, cv + tile_uv_dist);
            // our square tile is two triangle polygons
            AddVert(bl); AddVert(tl); AddVert(br); // triangle 1
            AddVert(br); AddVert(tl); AddVert(tr); // triangle 2

            // current info should always be tracking 'bl' of current tile
            // increment row item, moving across to the right (+x)
            cu += tile_uv_dist;
            curr_bl.x += tile_size;
        }

        // current info should always be tracking 'bl' of current tile
        // incrementing row, moving up (+y)
        cv += tile_uv_dist;
        cu = 0; // reset x space texture coordinate back to left side (0)
        curr_bl.y += tile_size;
        curr_bl.x = grid_bl.x;
}