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add quick notes about line clipping algorithms used

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This commit is contained in:
Bigfoot71 2025-03-19 02:19:28 +01:00
parent fe600a5ea1
commit 268a410a13
1 changed files with 2 additions and 0 deletions
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2
src/external/rlsw.h vendored
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@ -1856,6 +1856,7 @@ static inline uint8_t sw_line_clip_encode_2d(const float screen[2], int xMin, in
return code; return code;
} }
// Cohen-Sutherland algorithm, faster but for 2D only
static inline bool sw_line_clip_2d(sw_vertex_t* v1, sw_vertex_t* v2) static inline bool sw_line_clip_2d(sw_vertex_t* v1, sw_vertex_t* v2)
{ {
int xMin = RLSW.vpMin[0]; int xMin = RLSW.vpMin[0];
@ -1931,6 +1932,7 @@ static inline bool sw_line_clip_coord_3d(float q, float p, float* t1, float* t2)
return 1; return 1;
} }
// Liang-Barsky algorithm variant, more robust but slightly slower
static inline bool sw_line_clip_3d(sw_vertex_t* v1, sw_vertex_t* v2) static inline bool sw_line_clip_3d(sw_vertex_t* v1, sw_vertex_t* v2)
{ {
// TODO: Lerp all vertices here, not just homogeneous coordinates // TODO: Lerp all vertices here, not just homogeneous coordinates