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Thread: vector multiplication

  1. #1
    Junior Member
    Join Date
    Sep 2007
    Posts
    9

    vector multiplication

    Hi,

    I saw in some places the following code snippet in the Fragment shader.
    "uniform sampler2D s_tex0;
    varying vec2 v_texCoord;
    varying vec4 v_primaryColor;
    void main()
    {
    gl_FragColor = texture2D(s_tex0, v_texCoord) * v_primaryColor;
    }

    In the main() function, since the build-in function texture2D returns a vec4, is that legal for two vec4s to do a multiplication like that? What's the result of vec4_foo * vec4_bar? A cross multiplication?

    Thanks a lot.

    -Mike

  2. #2
    Junior Member
    Join Date
    Sep 2007
    Posts
    9

    Re: vector multiplication

    I think I found the answer. In the spec 5.9, it is said " Multiply (*) applied to two vectors yields a component-wise multiply". Thanks for reading.

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