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cascade multi shader

Question asked by San Zhang on Sep 7, 2016
Latest reply on Sep 11, 2016 by igorpadykov

How do we cascade multi shaders (vertex and fragment) on imx6? For example, I have loaded an image as a texture to GPU, and I want to find edges in an image using the line detection technology with hough transform. First, a frag shader is created to change a color image to a grey image. Next, a kernel filter is adopted in another fragment shader to find all the edges in the previous grey image. Finally, a hough transform technology is used in other shader files (maybe fragment shader, geometry shader, vertex shader) based on the result of the second step. If I could look into some related documents and sample codes, it will be great. Thanks in advance.