I use this library https://github.com/Rahiche/riveo_page_curl

Here is video :https://www.youtube.com/watch?v=4rBlKWhYnVY

Here is core code:

ShaderBuilder(
  (context, shader, _) {
    return AnimatedSampler(
      (image, size, canvas) async {
        // print("AnimatedSampler");
        if (backImage != null) {
          ShaderHelper.drawShaderRectBack(backImage!, size, canvas);
        }
        if (curlImage != null) {
          ShaderHelper.configureShader(
              shader, size, curlImage!, _animation.value);
          ShaderHelper.drawShaderRect(shader, size, canvas);
        }
      },
      enabled: true,
      child: Container(
        width: double.infinity,
        height: double.infinity,
      ),
    );
  },
  assetKey: shaderAssetKey,
)

backImage is page curl background, curlImage is page curl foreground.