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fix centering matrix + perspective projections

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This commit is contained in:
Chris Danford
2004-10-24 22:59:10 +00:00
parent a374bda82f
commit 0a6acd94ae
8 changed files with 61 additions and 42 deletions
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stepmania/src/RageDisplay.cpp
+18 -4
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@@ -180,7 +180,7 @@ void RageDisplay::SetDefaultRenderStates()
SetBlendMode( BLEND_NORMAL );
SetTextureFiltering( true );
LoadMenuPerspective(0, CENTER_X, CENTER_Y); // 0 FOV = ortho
ChangeCentering(0,0,1,1);
ChangeCentering(0,0,0,0);
}
@@ -632,12 +632,26 @@ RageMatrix RageDisplay::GetFrustumMatrix( float l, float r, float b, float t, fl
return m;
}
void RageDisplay::ChangeCentering( int trans_x, int trans_y, float scale_x, float scale_y )
void RageDisplay::ChangeCentering( int trans_x, int trans_y, int add_width, int add_height )
{
// in screen space, left edge = -1, right edge = 1, bottom edge = -1. top edge = 1
float fPercentShiftX = 2*trans_x/640.f;
float fPercentShiftY = -2*trans_y/480.f;
float fPercentScaleX = (640.f+add_width)/640.f;
float fPercentScaleY = (480.f+add_height)/480.f;
RageMatrix m1;
RageMatrix m2;
RageMatrixTranslation( &m1, float(trans_x), float(trans_y), 0 );
RageMatrixScaling( &m2, scale_x, scale_y, 1 );
RageMatrixTranslation(
&m1,
fPercentShiftX,
fPercentShiftY,
0 );
RageMatrixScaling(
&m2,
fPercentScaleX,
fPercentScaleY,
1 );
RageMatrixMultiply( &m_Centering, &m1, &m2 );
}