上下分镜的fragment shader 如下：
varying highp vec2 textureCoordinate;
uniform sampler2D inputImageTexture;
void main() {
vec2 uv = textureCoordinate;
if (uv.y < 0.5) {
uv.y = 1.0 - uv.y;
}
gl_FragColor = texture2D(inputImageTexture, fract(uv));
}
实现效果如下：
上下分镜
同样地，我们可以通过改变UV坐标的x轴来得到左右分镜：
varying highp vec2 textureCoordinate;
uniform sampler2D inputImageTexture;
void main() {
vec2 uv = textureCoordinate;
if (uv.x > 0.5) {
uv.x = 1.0 - uv.x;
}
gl_FragColor = texture2D(inputImageTexture, fract(uv));
}
网友评论