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Fixed bug #8301 - Software renderer draws long lines incorrectly / SDL_RENDERLINEMETHOD_GEOMETRY

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(cherry picked from commit ce0e0675de02411f0aafa526cd704f7fff1f1376)
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Sylvain 2024-01-16 13:50:46 +01:00 committed by Sam Lantinga
parent c69e858e7a
commit f3b0dc5007
1 changed files with 7 additions and 7 deletions
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14
src/render/software/SDL_triangle.c
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@ -87,9 +87,9 @@ int SDL_FillTriangle(SDL_Surface *dst, const SDL_Point points[3], Uint32 color)
#endif
/* cross product AB x AC */
static int cross_product(const SDL_Point *a, const SDL_Point *b, int c_x, int c_y)
static Sint64 cross_product(const SDL_Point *a, const SDL_Point *b, int c_x, int c_y)
{
return (b->x - a->x) * (c_y - a->y) - (b->y - a->y) * (c_x - a->x);
return ((Sint64)(b->x - a->x)) * ((Sint64)(c_y - a->y)) - ((Sint64)(b->y - a->y)) * ((Sint64)(c_x - a->x));
}
/* check for top left rules */
@ -171,9 +171,9 @@ static void bounding_rect(const SDL_Point *a, const SDL_Point *b, const SDL_Poin
int x, y; \
for (y = 0; y < dstrect.h; y++) { \
/* y start */ \
int w0 = w0_row; \
int w1 = w1_row; \
int w2 = w2_row; \
Sint64 w0 = w0_row; \
Sint64 w1 = w1_row; \
Sint64 w2 = w2_row; \
for (x = 0; x < dstrect.w; x++) { \
/* In triangle */ \
if (w0 + bias_w0 >= 0 && w1 + bias_w1 >= 0 && w2 + bias_w2 >= 0) { \
@ -226,7 +226,7 @@ int SDL_SW_FillTriangle(SDL_Surface *dst, SDL_Point *d0, SDL_Point *d1, SDL_Poin
int area, is_clockwise;
int d2d1_y, d1d2_x, d0d2_y, d2d0_x, d1d0_y, d0d1_x;
int w0_row, w1_row, w2_row;
Sint64 w0_row, w1_row, w2_row;
int bias_w0, bias_w1, bias_w2;
int is_uniform;
@ -469,7 +469,7 @@ int SDL_SW_BlitTriangle(
int d2d1_y, d1d2_x, d0d2_y, d2d0_x, d1d0_y, d0d1_x;
int s2s0_x, s2s1_x, s2s0_y, s2s1_y;
int w0_row, w1_row, w2_row;
Sint64 w0_row, w1_row, w2_row;
int bias_w0, bias_w1, bias_w2;
int is_uniform;