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List: kstars-devel
Subject: [Kstars-devel]
From: Khudyakov Alexey <alexey.skladnoy () gmail ! com>
Date: 2011-05-05 12:20:30
Message-ID: 20110505122030.A9DDDA60CB () git ! kde ! org
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Git commit 3f0fbe62ace6b29b4380506a57e2692d66875ed6 by Khudyakov Alexey.
Committed on 05/05/2011 at 13:06.
Pushed by khudyakov into branch 'master'.
Fix mirroring of planet images by mirroring texture.
This is due to differences in coordinate systems in QPainter (left)
and OpenGL (right)
CCMAIL: kstars-devel@kde.org
M +8 -4 kstars/skyglpainter.cpp
http://commits.kde.org/kstars/3f0fbe62ace6b29b4380506a57e2692d66875ed6
diff --git a/kstars/skyglpainter.cpp b/kstars/skyglpainter.cpp
index 928f968..612a04f 100644
--- a/kstars/skyglpainter.cpp
+++ b/kstars/skyglpainter.cpp
@@ -204,16 +204,20 @@ bool SkyGLPainter::drawPlanet(KSPlanetBase* planet)
glScalef( s, s, 1 );
glBegin(GL_QUADS);
- glTexCoord2f( 0, 0);
+ // Note! Y coordinate of texture is mirrored w.r.t. to
+ // vertex coordinates to account for difference between
+ // OpenGL and QPainter coordinate system.
+ // Otherwise image would appear mirrored
+ glTexCoord2f( 0, 1);
glVertex2f( -1, -1);
- glTexCoord2f( 1, 0);
+ glTexCoord2f( 1, 1);
glVertex2f( 1, -1);
- glTexCoord2f( 1, 1);
+ glTexCoord2f( 1, 0);
glVertex2f( 1, 1);
- glTexCoord2f( 0, 1);
+ glTexCoord2f( 0, 0);
glVertex2f( -1, 1);
glEnd();
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