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GFX3D: 

- Do workaround for possible NaN comparisons being done when Y-sorting. (Addresses bug #1461.)
This commit is contained in:
rogerman 2015-03-26 09:49:56 +00:00
parent 2fc39e3c3e
commit 9b2d36df0c
1 changed files with 6 additions and 2 deletions
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8
desmume/src/gfx3d.cpp
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@ -2185,16 +2185,20 @@ static void gfx3d_doFlush()
//also the buttons in the knights in the nightmare frontend depend on this
for(int i=0; i<polycount; i++)
{
// TODO: Possible divide by zero with the w-coordinate.
// Is the vertex being read correctly? Is 0 a valid value for w?
// If both of these questions answer to yes, then how does the NDS handle a NaN?
// For now, simply prevent w from being zero.
POLY &poly = polylist->list[i];
float verty = vertlist->list[poly.vertIndexes[0]].y;
float vertw = vertlist->list[poly.vertIndexes[0]].w;
float vertw = (vertlist->list[poly.vertIndexes[0]].w != 0.0f) ? vertlist->list[poly.vertIndexes[0]].w : 0.00000001f;
verty = 1.0f-(verty+vertw)/(2*vertw);
poly.miny = poly.maxy = verty;
for(int j=1; j<poly.type; j++)
{
verty = vertlist->list[poly.vertIndexes[j]].y;
vertw = vertlist->list[poly.vertIndexes[j]].w;
vertw = (vertlist->list[poly.vertIndexes[j]].w != 0.0f) ? vertlist->list[poly.vertIndexes[j]].w : 0.00000001f;
verty = 1.0f-(verty+vertw)/(2*vertw);
poly.miny = min(poly.miny, verty);
poly.maxy = max(poly.maxy, verty);