Xamarin.iOS GPUImage：如何在Xamarin.iOS中使用自定义着色器文件创建GPUImageTwoInputFilter

Question

我想在xamarin.iOS中使用自定义着色器文件创建GPUImageTwoInputFilter。我正在使用GPUImage组件。

var stillCamera = new GPUImageStillCamera ();
var filter1 = new GPUImageTwoInputFilter();
stillCamera.AddTarget(filter1);
var internalSourcePicture1 = new GPUImagePicture(UIImage.FromFile("image.png").CGImage,true);
internalSourcePicture1.AddTarget(filter1);
internalSourcePicture1.ProcessImage();

但我们不知道如何在GPUImageTwoInputFilter中传递着色器文件

Answer 1

将自定义片段着色器（id="sec[0-9]+"）添加到.fsh应用包中，作为Xamarin.iOS的构建类型。

然后通过BundleResource

加载它

注意：请勿包含文件扩展名，否则您将在app output / log中收到“无法加载顶点着色器”

GPUImageFilter.FromFragmentShaderFile

或将片段着色器嵌入为字符串：

var filter = GPUImageFilter.FromFragmentShaderFile ("StackOverflowShader");

并通过 fragShaderString = @" varying highp vec2 textureCoordinate; varying highp vec2 textureCoordinate2; uniform sampler2D inputImageTexture; uniform sampler2D inputImageTexture2; void main() { lowp vec4 base = texture2D(inputImageTexture, textureCoordinate); lowp vec4 overlayer = texture2D(inputImageTexture2, textureCoordinate2); gl_FragColor = vec4(min(overlayer.rgb * base.a, base.rgb * overlayer.a) + overlayer.rgb * (1.0 - base.a) + base.rgb * (1.0 - overlayer.a), 1.0); } ";

加载

FromFragmentShaderString