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Add old lintersect implementation

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nukeykt 2019-07-29 23:10:41 +09:00 committed by Christoph Oelckers
parent 5c099bea05
commit 1aab7601df
1 changed files with 40 additions and 0 deletions
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40
source/build/src/engine.cpp
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@ -7864,11 +7864,51 @@ int32_t changespritestat(int16_t spritenum, int16_t newstatnum)
// //
// lintersect (internal) // lintersect (internal)
// //
int32_t lintersect_old(const int32_t originX, const int32_t originY, const int32_t originZ,
const int32_t destX, const int32_t destY, const int32_t destZ,
const int32_t lineStartX, const int32_t lineStartY, const int32_t lineEndX, const int32_t lineEndY,
int32_t *intersectionX, int32_t *intersectionY, int32_t *intersectionZ)
{
const vec2_t ray = { destX-originX,
destY-originY };
const vec2_t lineVec = { lineEndX-lineStartX,
lineEndY-lineStartY };
const vec2_t originDiff = { lineStartX-originX,
lineStartY-originY };
const int32_t rayCrossLineVec = ray.x*lineVec.y - ray.y*lineVec.x;
if (rayCrossLineVec == 0)
return 0;
const int32_t originDiffCrossLineVec = originDiff.x*lineVec.y - originDiff.y*lineVec.x;
const int32_t originDiffCrossRay = originDiff.x*ray.y - originDiff.y*ray.x;
if ((rayCrossLineVec > 0 && (originDiffCrossLineVec < 0 || originDiffCrossLineVec >= rayCrossLineVec
|| originDiffCrossRay < 0 || originDiffCrossRay >= rayCrossLineVec))
|| (rayCrossLineVec < 0 && (originDiffCrossLineVec > 0 || originDiffCrossLineVec <= rayCrossLineVec
|| originDiffCrossRay > 0 || originDiffCrossRay <= rayCrossLineVec)))
return 0;
const int32_t t = divscale24(originDiffCrossLineVec, rayCrossLineVec);
*intersectionX = originX + mulscale24(ray.x, t);
*intersectionY = originY + mulscale24(ray.y, t);
*intersectionZ = originZ + mulscale24(destZ - originZ, t);
return 1;
}
int32_t lintersect(const int32_t originX, const int32_t originY, const int32_t originZ, int32_t lintersect(const int32_t originX, const int32_t originY, const int32_t originZ,
const int32_t destX, const int32_t destY, const int32_t destZ, const int32_t destX, const int32_t destY, const int32_t destZ,
const int32_t lineStartX, const int32_t lineStartY, const int32_t lineEndX, const int32_t lineEndY, const int32_t lineStartX, const int32_t lineStartY, const int32_t lineEndX, const int32_t lineEndY,
int32_t *intersectionX, int32_t *intersectionY, int32_t *intersectionZ) int32_t *intersectionX, int32_t *intersectionY, int32_t *intersectionZ)
{ {
if (blooddemohack)
{
return lintersect_old(originX, originY, originZ, destX, destY, destZ, lineStartX, lineStartY, lineEndX, lineEndY,
intersectionX, intersectionY, intersectionZ);
}
const vec2_t ray = { destX-originX, const vec2_t ray = { destX-originX,
destY-originY }; destY-originY };
const vec2_t lineVec = { lineEndX-lineStartX, const vec2_t lineVec = { lineEndX-lineStartX,