Channel_Viewer.dctl

//Display individual channels as monochrome
//Display combined channels in color

DEFINE_UI_PARAMS(p_DisplayR, Red, DCTLUI_CHECK_BOX, 0)
DEFINE_UI_PARAMS(p_DisplayG, Green, DCTLUI_CHECK_BOX, 0)
DEFINE_UI_PARAMS(p_DisplayB, Blue, DCTLUI_CHECK_BOX, 0)

__DEVICE__ float3 transform(int p_Width, int p_Height, int p_X, int p_Y, float p_R, float p_G, float p_B) {
    float3 out = make_float3(0); // Initialize output to black

    // Count the number of selected channels
    int numSelectedChannels = p_DisplayR + p_DisplayG + p_DisplayB;

    // Display individual channels as monochrome
    if (numSelectedChannels == 1) {
        if (p_DisplayR == 1) {
            out.x = p_R; // Red channel
            out.y = p_R;
            out.z = p_R;
        }
        if (p_DisplayG == 1) {
            out.x = p_G;
            out.y = p_G; // Green channel
            out.z = p_G;
        }
        if (p_DisplayB == 1) {
            out.x = p_B;
            out.y = p_B;
            out.z = p_B; // Blue channel
        }
    } else if (numSelectedChannels == 3 || numSelectedChannels == 0) { // Display in full color if all or none selected
        out = make_float3(p_R, p_G, p_B);
    } else { // Combine selected channels, setting the third one to 0.0
        if (p_DisplayR == 0) {
            out.x = 0;
        } else {
            out.x = p_R;
        }
        if (p_DisplayG == 0) {
            out.y = 0;
        } else {
            out.y = p_G;
        }
        if (p_DisplayB == 0) {
            out.z = 0;
        } else {
            out.z = p_B;
        }
    }

    return out;
}