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simplify maths

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This commit is contained in:
Ian Curtis 2018-01-10 20:37:21 +00:00
parent adb5196625
commit 863ea95013
1 changed files with 10 additions and 15 deletions
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25
Src/Graphics/New3D/New3D.cpp
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@ -764,20 +764,15 @@ void CNew3D::RenderViewport(UINT32 addr)
vp->angle_bottom = -atan2(*(float *)&vpnode[18], -*(float *)&vpnode[19]); // Perhaps they are just used for culling and not rendering.
*/
float cv = *(float *)&vpnode[0x8]; // 1/tan(left-right)
float cw = *(float *)&vpnode[0x9]; // 1/tan(top-bottom)
float cv = *(float *)&vpnode[0x8]; // 1/(left-right)
float cw = *(float *)&vpnode[0x9]; // 1/(top-bottom)
float io = *(float *)&vpnode[0xa]; // top / bottom (ratio) - ish
float jo = *(float *)&vpnode[0xb]; // left / right (ratio)
float left = (1.0f / cv) * (0.0f - jo);
float right = (1.0f / cv) * (1.0f - jo);
float bottom = (1.0f / cw) * -(1.0f - io);
float top = (1.0f / cw) * -(0.0f - io);
vp->angle_left = std::atan(left); // probably could skip atan
vp->angle_right = std::atan(right);
vp->angle_bottom = std::atan(bottom);
vp->angle_top = std::atan(top);
vp->angle_left = (1.0f / cv) * (0.0f - jo);
vp->angle_right = (1.0f / cv) * (1.0f - jo);
vp->angle_bottom = (1.0f / cw) * -(1.0f - io);
vp->angle_top = (1.0f / cw) * -(0.0f - io);
// calculate the frustum shape, near/far pair are dummy values
@ -1571,10 +1566,10 @@ void CNew3D::CalcViewport(Viewport* vp, float near, float far)
near = far / 1000000; // if we get really close to zero somehow, we will have almost no depth precision
}
float l = near * tanf(vp->angle_left); // we need to calc the shape of the projection frustum for culling
float r = near * tanf(vp->angle_right);
float t = near * tanf(vp->angle_top);
float b = near * tanf(vp->angle_bottom);
float l = near * vp->angle_left; // we need to calc the shape of the projection frustum for culling
float r = near * vp->angle_right;
float t = near * vp->angle_top;
float b = near * vp->angle_bottom;
vp->projectionMatrix.LoadIdentity(); // reset matrix