https://bugs.kde.org/show_bug.cgi?id=393073
Bug ID: 393073
Summary: Perspective incorrect texture mapping
Product: kwin
Version: unspecified
Platform: Other
OS: Linux
Status: UNCONFIRMED
Severity: normal
Priority: NOR
Component: scene-opengl
Assignee: kwin-bugs-n...@kde.org
Reporter: vladz...@gmail.com
Target Milestone: ---
Created attachment 111982
--> https://bugs.kde.org/attachment.cgi?id=111982&action=edit
Window texture is not interpolated correctly across the trapezoid. There
shouldn't be any triangles.
Steps to reproduce:
* Apply the following patch
diff --git a/effects/magiclamp/magiclamp.cpp b/effects/magiclamp/magiclamp.cpp
index a392d4942..a95efa16c 100644
--- a/effects/magiclamp/magiclamp.cpp
+++ b/effects/magiclamp/magiclamp.cpp
@@ -91,7 +91,6 @@ void MagicLampEffect::prePaintWindow(EffectWindow* w,
WindowPrePaintData& data,
if (mTimeLineWindows.contains(w)) {
// We'll transform this window
data.setTransformed();
- data.quads = data.quads.makeGrid(40);
w->enablePainting(EffectWindow::PAINT_DISABLED_BY_MINIMIZE);
}
* Enable Magic lamp
* Set duration to 5000
* Minimize a window
Actual results:
Textures aren't properly mapped.
Expected results:
Textures should have been mapped something like this
https://i.stack.imgur.com/yhL62.png
(source:
https://gamedev.stackexchange.com/questions/29478/silly-question-about-perspective-correct-texture-mapping)
Please note that Magic lamp behaves weird when the grid consists only of 1
cell, but this bug report
not about that! This bug report about correct texture mapping when window quads
have been transformed.
---
Another view on the problem: https://i.stack.imgur.com/2qVr1.png
(source:
https://stackoverflow.com/questions/15242507/perspective-correct-texturing-of-trapezoid-in-opengl-es-2-0)
On the left hand side: what KWin is currently doing, on the right hand side:
what KWin should do.
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