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A great idea from Cedric Borgese: Instead of transforming

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the OpenGL scene to match X coordinate system, adjust it
directly using glOrtho().


svn path=/branches/work/kwin_composite/; revision=603929
This commit is contained in:
Luboš Luňák 2006-11-10 20:27:44 +00:00
parent 001ddfacbd
commit 60d343f1d7
1 changed files with 3 additions and 7 deletions
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10
scene_opengl.cpp
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@ -200,7 +200,8 @@ SceneOpenGL::SceneOpenGL( Workspace* ws )
// OpenGL scene setup
glMatrixMode( GL_PROJECTION );
glLoadIdentity();
glOrtho( 0, displayWidth(), 0, displayHeight(), 0, 65535 );
// swap top and bottom to have OpenGL coordinate system match X system
glOrtho( 0, displayWidth(), displayHeight(), 0, 0, 65535 );
glMatrixMode( GL_MODELVIEW );
glLoadIdentity();
checkGLError( "Init" );
@ -353,11 +354,6 @@ void SceneOpenGL::paint( QRegion damage, ToplevelList toplevels )
glPushMatrix();
glClearColor( 0, 0, 0, 1 );
glClear( GL_COLOR_BUFFER_BIT );
// OpenGL has (0,0) in the bottom-left corner while X has it in the top-left corner,
// which is annoying and confusing. Therefore flip the whole OpenGL scene upside down
// and move it up, so that it actually uses the same coordinate system like X.
glScalef( 1, -1, 1 );
glTranslatef( 0, -displayHeight(), 0 );
int mask = 0;
paintScreen( &mask, &damage ); // call generic implementation
glPopMatrix();
@ -560,7 +556,7 @@ void SceneOpenGL::Window::bindTexture()
{
// convert to OpenGL coordinates (this is mapping
// the pixmap to a texture, this is not affected
// by transforming the OpenGL scene)
// by using glOrtho() for the OpenGL scene)
int gly = toplevel->height() - r.y() - r.height();
texture_y_inverted = false;
glCopyTexSubImage2D( GL_TEXTURE_RECTANGLE_ARB, 0,