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Hi! I'm working on trying to display a video with alpha. Which is the best approach to achieve this in a shader? I'm creating a sprite kit scene and adding an effect node which has a shader. This is working but I think that the shader is not well defined.

return SKShader(source: """
                                void main() {
                                vec2 texCoords = v_tex_coord;
                                vec2 colorCoords = vec2(texCoords.x, texCoords.y);
                                vec2 alphaCoords = vec2(texCoords.x, texCoords.y);
                                vec4 color = texture2D(u_texture, colorCoords);
                                //float alpha = texture2D(u_texture, alphaCoords).r;
                                    
                                float squared_threshold = (0.01 * 0.01);
                                float squared_distance = dot(color.rgb, color.rgb);

                                if (squared_distance < squared_threshold)
                                {
                                    gl_FragColor = vec4(color.rgb, 0);
                                }
                                else
                                {
                                    gl_FragColor = vec4(color.rgb, 1);
                                }
                                }
                        """)

Any hints? Thanks in advance!

Color Alpha
Colors all clear pixels in the node.

Color Non-Alpha
Colors all clear pixels in the node.

Shouldn't the description of these two be opposite?

Jet: Error Domain=MTLLibraryErrorDomain Code=3 "Compilation failed:

program_source:33:1: error: unknown type name 'SHKWater'
SHKWater
^
program_source:33:9: error: expected unqualified-id
SHKWater
^
" UserInfo={NSLocalizedDescription=Compilation failed:

program_source:33:1: error: unknown type name 'SHKWater'
SHKWater
^
program_source:33:9: error: expected unqualified-id
SHKWater
^
}
2020-01-20 15:30:49.461672+0530 paperboat[7746:150969] SKShader failed to compile:
Compilation failed:

program_source:33:1: error: unknown type name 'SHKWater'
SHKWater
^
program_source:33:9: error: expected unqualified-id
SHKWater
^

Thanks for these! I mean to use some of this code in my own open-source game engine.

Do I need to do anything besides including the full header and license in each relevant file?

Will I have to modify my own license (the default Apache-2.0)?