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Thread: Applying colors on shared vertices

  1. #1
    Junior Member Newbie
    Join Date
    Jul 2013
    Posts
    7

    Post Applying colors on shared vertices

    int x = 100;
    int y = 100;
    int width = 250;
    int height = 250;
    int border = 10;

    int top = y + border;
    int bottom = y + height;
    int left = x + border;
    int right = x + width;

    static int vertices[] = {
    x, y, //0
    right, y, //1
    right, bottom, //2
    x, bottom, //3

    left, top, //4
    right - border, top, //5
    right - border, bottom - border, //6
    left, bottom - border, //7

    left, top + (height - border - border) * 0.5,
    right - border, top + (height - border - border) * 0.5
    };


    static unsigned int indices[] = {
    0, 1, 4, 5, //top border
    5, 1, 6, 2, //right border
    2, 6, 3, 7, //bottom border
    7, 4, 3, 0, //left border

    4, 5, 8, 9,
    8, 9, 7, 6,
    };

    static unsigned char colors[] = {
    0x00, 0x00, 0x00,
    0x00, 0x00, 0x00,
    0x00, 0x00, 0x00,
    0x00, 0x00, 0x00,

    0xff, 0x00, 0x00,
    0xff, 0x00, 0x00,
    0xff, 0x00, 0x00,
    0xff, 0x00, 0x00,

    0x00, 0xff, 0x00,
    0x00, 0xff, 0x00,
    0x00, 0xff, 0x00,
    0x00, 0xff, 0x00,

    0x00, 0x00, 0xff,
    0x00, 0x00, 0xff,
    0x00, 0x00, 0xff,
    0x00, 0x00, 0xff,

    };

    My current undesired output:

    <error>

    Is it possible to apply a single color on a single quad in this kind of implementation?

  2. #2
    Senior Member OpenGL Pro
    Join Date
    Jan 2012
    Location
    Australia
    Posts
    1,106
    Strictly each vertex has only has one set of data including colour; you can repeat a vertex position and have a different colour for each repetition.

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