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preventing a possible division by zero

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This commit is contained in:
Bigfoot71 2025-05-04 17:10:41 +02:00
parent 0e58392e8f
commit c6cf6c953a
1 changed files with 11 additions and 4 deletions
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13
src/external/rlsw.h vendored
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@ -2044,13 +2044,20 @@ static inline void FUNC_NAME(const sw_texture_t* tex, const sw_vertex_t* start,
int xEnd = (int)(end->screen[0] + 0.5f); \ int xEnd = (int)(end->screen[0] + 0.5f); \
int y = (int)(start->screen[1] + 0.5f); \ int y = (int)(start->screen[1] + 0.5f); \
\ \
/* Calculate the initial interpolation parameter and its increment */ \ /* Safely compute the inverse horizontal distance */ \
float dt = 1.0f / (end->screen[0] - start->screen[0]); \ float dx = end->screen[0] - start->screen[0]; \
if (fabsf(dx) < 1e-6f) return; \
\
/* Calculate the interpolation step along the X axis */ \
float dt = 1.0f / dx; \
\
/* Initialize the interpolation parameter \
't' ranges from 0 to 1 across the scanline */ \
float t = (xStart - start->screen[0]) * dt; \ float t = (xStart - start->screen[0]) * dt; \
\ \
/* Calculate the horizontal gradients for UV coordinates */ \
float xDu, xDv; \ float xDu, xDv; \
if (ENABLE_TEXTURE) { \ if (ENABLE_TEXTURE) { \
/* Calculate the horizontal gradients for UV coordinates */ \
xDu = (end->texcoord[0] - start->texcoord[0]) * dt; \ xDu = (end->texcoord[0] - start->texcoord[0]) * dt; \
xDv = (end->texcoord[1] - start->texcoord[1]) * dt; \ xDv = (end->texcoord[1] - start->texcoord[1]) * dt; \
} \ } \