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Make OpenGL software-like shear effect consistent with software.
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1 changed files with 6 additions and 2 deletions
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@ -3029,10 +3029,14 @@ EXPORT void HWRAPI(SetTransform) (FTransform *stransform)
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// https://zdoom.org/wiki/Y-shearing
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if (shearing)
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{
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float fdy = stransform->viewaiming * 2;
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float shear = stransform->viewaiming * 2;
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float ang = 2*M_PI*(stransform->rollangle/360);
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float fdx = stransform->roll ? shear * sin(ang) : 0.0f;
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float fdy = stransform->roll ? shear * cos(ang) : shear;
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if (stransform->flip)
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fdy *= -1.0f;
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pglTranslatef(0.0f, -fdy/BASEVIDHEIGHT, 0.0f);
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pglTranslatef(fdx/BASEVIDWIDTH, -fdy/BASEVIDHEIGHT, 0.0f);
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}
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if (special_splitscreen)
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