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Distort far edges to viewz for a flat horizon line

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This commit is contained in:
fickleheart 2020-03-22 12:20:26 -05:00
parent deff1565dc
commit 14d6a01292
1 changed files with 13 additions and 9 deletions
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22
src/hardware/hw_main.c
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@ -709,9 +709,10 @@ static void HWR_RenderPlane(subsector_t *subsector, extrasubsector_t *xsub, bool
if (subsector)
{
// Horizon lines
FOutVector horizonpts[5];
FOutVector horizonpts[6];
float dist, vx, vy;
const float renderdist = 60000.0f; // Well past the Z cutoff plane, but needed to fill out to that point at a wider angle
const float renderdist = 30000.0f; // How far out to properly render the plane
const float farrenderdist = 32768.0f; // From here, raise plane to horizon level to fill in the line with some texture distortion
seg_t *line = &segs[subsector->firstline];
@ -742,16 +743,19 @@ static void HWR_RenderPlane(subsector_t *subsector, extrasubsector_t *xsub, bool
vy = (vy - gr_viewy) * renderdist / dist + gr_viewy;
SETUP3DVERT((&horizonpts[3]), vx, vy);
// Midpoint for better filling
vx = (horizonpts[0].x + horizonpts[3].x)/2;
vy = (horizonpts[0].z + horizonpts[3].z)/2;
dist = sqrtf(powf(vx - gr_viewx, 2) + powf(vy - gr_viewy, 2));
vx = (vx - gr_viewx) * renderdist / dist + gr_viewx;
vy = (vy - gr_viewy) * renderdist / dist + gr_viewy;
// Horizon fills
vx = (horizonpts[0].x - gr_viewx) * farrenderdist / renderdist + gr_viewx;
vy = (horizonpts[0].z - gr_viewy) * farrenderdist / renderdist + gr_viewy;
SETUP3DVERT((&horizonpts[5]), vx, vy);
horizonpts[5].y = gr_viewz;
vx = (horizonpts[3].x - gr_viewx) * farrenderdist / renderdist + gr_viewx;
vy = (horizonpts[3].z - gr_viewy) * farrenderdist / renderdist + gr_viewy;
SETUP3DVERT((&horizonpts[4]), vx, vy);
horizonpts[4].y = gr_viewz;
// Draw
HWD.pfnDrawPolygon(&Surf, horizonpts, 5, PolyFlags);
HWD.pfnDrawPolygon(&Surf, horizonpts, 6, PolyFlags);
}
}
}