如何在不模糊图像的情况下制作小的纹理比例？像Minecraft一样？

Question

我将这些模式用于OPENGL

    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();
    glOrtho(0, 640, 480, 0, 1, -1);
    glMatrixMode(GL_MODELVIEW);
    glEnable(GL_TEXTURE_2D);

我正在使用此代码绘制纹理

    texture.bind();

    glBegin(GL_QUADS);
    glTexCoord2f(0, 0);
    glVertex2f(x, y);// Upper Left

    glTexCoord2f(1, 0);
    glVertex2f(x + width, y); // Upper right

    glTexCoord2f(1, 1);
    glVertex2f(x + width, y + heigth); // Lower right

    glTexCoord2f(0, 1);
    glVertex2f(x, y + heigth); // Lower left
    glEnd();

它自己的纹理来自Minecraft,是一个16x16纹理.但当我将它缩放到160x160时,我得到的结果是:

Answer 1

你需要指定GL_TEXTURE_MIN_FILTER&GL_TEXTURE_MAG_FILTER.

如果要保持像素看起来像纹理,您将执行以下操作.

texture.bind(); // First you bind your texture
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);

如果你想让他们回到"blury",你会做以下事情.

texture.bind(); // First you bind your texture
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);

请记住,对于多个纹理,您需要单独调用它们,就像这样.

texture1.bind();
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);

texture2.bind();
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);