0008442: [SCRIPT] Small bug with osSetDynamicTextureDataBlendFace under Linux

(0033812)
UbitUmarov (administrator)
2019-01-15 16:58

changed how blending is done
with blend option true, the parameter alpha is transparency applied to the texture on drawing on top of the face texture.
- a value of 0 will do nothing, only the face texture is visible.
- with value of 255 backgroud visibilty depends on texture alpha

this seems more usefull for osSetDynamicTextureURLBlendFace
both windows and linux look similar now.

blend option false, for now just replaces the alpha channel of the texture, guess not that usefull.

this is a breaking change, scripts using this without blend == true and alpha == 255 will generate diferent images.

we can consider reverting this.

(0033822)
djphil (reporter)
2019-01-16 09:00
edited on: 2019-01-16 09:12

I just tested and here is what I think explained on the screenshot.

Tested with this script:
// Change values here
integer alpha = 255;
integer status = TRUE;

default
{
    on_rez(integer p) {llResetScript();}
    touch_start(integer n) {llResetScript();}

    state_entry()
    {
        llSetTexture(osGetMapTexture(), 0);

        string cmd;
        cmd = osSetPenSize(cmd, 3);
        cmd = osSetPenColor(cmd, "White");
        cmd = osMovePen(cmd, 78, 78);
        cmd = osDrawRectangle(cmd, 100, 100);
        // Change alpha value here
        string params = "width:256, height:256, alpha: 0";
        osSetDynamicTextureDataBlendFace("", "vector", cmd, params, status, 2, 0, alpha, 0);
    }
}

(0033823)
UbitUmarov (administrator)
2019-01-16 12:31

made a few more changes to the blend process

(0033824)
djphil (reporter)
2019-01-16 12:42

Yes, it work perfectly now, tyvm :)

Issue History
Date Modified	Username	Field	Change
2019-01-06 17:53	djphil	New Issue
2019-01-06 19:50	djphil	Additional Information Updated	View Revisions
2019-01-15 16:58	UbitUmarov	Note Added: 0033812
2019-01-16 08:59	djphil	File Added: dynamic_texture_alpha_01.jpg
2019-01-16 09:00	djphil	Note Added: 0033822
2019-01-16 09:10	djphil	Note Edited: 0033822	View Revisions
2019-01-16 09:10	djphil	Note Edited: 0033822	View Revisions
2019-01-16 09:11	djphil	Note Edited: 0033822	View Revisions
2019-01-16 09:12	djphil	Note Edited: 0033822	View Revisions
2019-01-16 12:31	UbitUmarov	Note Added: 0033823
2019-01-16 12:42	djphil	Note Added: 0033824
2019-01-16 12:42	djphil	Status	new => resolved
2019-01-16 12:42	djphil	Resolution	open => fixed
2019-01-16 12:42	djphil	Assigned To	=> djphil

Notes
(0033812) UbitUmarov (administrator) 2019-01-15 16:58	changed how blending is done with blend option true, the parameter alpha is transparency applied to the texture on drawing on top of the face texture. - a value of 0 will do nothing, only the face texture is visible. - with value of 255 backgroud visibilty depends on texture alpha this seems more usefull for osSetDynamicTextureURLBlendFace both windows and linux look similar now. blend option false, for now just replaces the alpha channel of the texture, guess not that usefull. this is a breaking change, scripts using this without blend == true and alpha == 255 will generate diferent images. we can consider reverting this.

(0033822) djphil (reporter) 2019-01-16 09:00 edited on: 2019-01-16 09:12	I just tested and here is what I think explained on the screenshot. Tested with this script: // Change values here integer alpha = 255; integer status = TRUE; default { on_rez(integer p) {llResetScript();} touch_start(integer n) {llResetScript();} state_entry() { llSetTexture(osGetMapTexture(), 0); string cmd; cmd = osSetPenSize(cmd, 3); cmd = osSetPenColor(cmd, "White"); cmd = osMovePen(cmd, 78, 78); cmd = osDrawRectangle(cmd, 100, 100); // Change alpha value here string params = "width:256, height:256, alpha: 0"; osSetDynamicTextureDataBlendFace("", "vector", cmd, params, status, 2, 0, alpha, 0); } }

(0033823) UbitUmarov (administrator) 2019-01-16 12:31	made a few more changes to the blend process

(0033824) djphil (reporter) 2019-01-16 12:42	Yes, it work perfectly now, tyvm :)

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