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TINYGL: Implemented tglPolygonOffset function

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Paweł Kołodziejski 2021-10-26 21:59:04 +02:00
parent 3f3b0e048e
commit eab1fe4097
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GPG key ID: 0BDADC9E74440FF7
7 changed files with 46 additions and 2 deletions
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8
graphics/tinygl/ztriangle.cpp
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@ -231,6 +231,12 @@ void FrameBuffer::fillTriangle(ZBufferPoint *p0, ZBufferPoint *p1, ZBufferPoint
dtzdy = (fdx1 * d2 - fdx2 * d1);
}
int polyOffset = 0;
if (kInterpZ && (_offsetStates & TGL_OFFSET_FILL) && (kDrawLogic == DRAW_FLAT || kDrawLogic == DRAW_SMOOTH)) {
int m = MAX(ABS(dzdx), ABS(dzdy));
polyOffset = -m * _offsetFactor + -_offsetUnits * (1 << 6);
}
// screen coordinates
int pp1 = xsize * p0->y;
@ -312,7 +318,7 @@ void FrameBuffer::fillTriangle(ZBufferPoint *p0, ZBufferPoint *p1, ZBufferPoint
dxdy_max = dxdy_min + 1;
if (kInterpZ) {
z1 = l1->z;
z1 = l1->z + polyOffset;
dzdl_min = (dzdy + dzdx * dxdy_min);
dzdl_max = dzdl_min + dzdx;
}