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fix gradient calculation

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This commit is contained in:
Bigfoot71 2025-05-18 03:49:53 +02:00
parent 0b08e75a2e
commit 6a3818b34f
1 changed files with 23 additions and 23 deletions
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46
src/external/rlsw.h vendored
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@ -2552,25 +2552,25 @@ static inline void FUNC_NAME(const sw_vertex_t* v0, const sw_vertex_t* v1, const
\ \
/* Compute height differences */ \ /* Compute height differences */ \
\ \
float h20 = y2 - y0; \ float h02 = y2 - y0; \
float h10 = y1 - y0; \ float h01 = y1 - y0; \
float h21 = y2 - y1; \ float h12 = y2 - y1; \
\ \
if (h20 < 1e-6f) { \ if (h02 < 1e-6f) { \
return; \ return; \
} \ } \
\ \
/* Precompute the inverse values without additional checks */ \ /* Precompute the inverse values without additional checks */ \
\ \
float invH20 = 1.0f / h20; \ float invH02 = 1.0f / h02; \
float invH10 = (h10 > 1e-6f) ? 1.0f / h10 : 0.0f; \ float invH01 = (h01 > 1e-6f) ? 1.0f / h01 : 0.0f; \
float invH21 = (h21 > 1e-6f) ? 1.0f / h21 : 0.0f; \ float invH12 = (h12 > 1e-6f) ? 1.0f / h12 : 0.0f; \
\ \
/* Pre-calculation of slopes (dx/dy) */ \ /* Pre-calculation of slopes */ \
\ \
float dx02 = (x2 - x0) * invH20; \ float dx02 = (x2 - x0) * invH02; \
float dx01 = (x1 - x0) * invH10; \ float dx01 = (x1 - x0) * invH01; \
float dx12 = (x2 - x1) * invH21; \ float dx12 = (x2 - x1) * invH12; \
\ \
/* Y bounds (vertical clipping) */ \ /* Y bounds (vertical clipping) */ \
\ \
@ -2580,10 +2580,10 @@ static inline void FUNC_NAME(const sw_vertex_t* v0, const sw_vertex_t* v1, const
\ \
/* Compute gradients for each side of the triangle */ \ /* Compute gradients for each side of the triangle */ \
\ \
sw_vertex_t vDy20, vDy10, vDy21; \ sw_vertex_t vDy02, vDy01, vDy12; \
sw_get_vertex_grad_PTCH(&vDy20, v2, v0, invH20); \ sw_get_vertex_grad_PTCH(&vDy02, v0, v2, invH02); \
sw_get_vertex_grad_PTCH(&vDy10, v1, v0, invH10); \ sw_get_vertex_grad_PTCH(&vDy01, v0, v1, invH01); \
sw_get_vertex_grad_PTCH(&vDy21, v2, v1, invH21); \ sw_get_vertex_grad_PTCH(&vDy12, v1, v2, invH12); \
\ \
/* Initializing scanline variables */ \ /* Initializing scanline variables */ \
\ \
@ -2600,16 +2600,16 @@ static inline void FUNC_NAME(const sw_vertex_t* v0, const sw_vertex_t* v1, const
vLeft.screen[1] = vRight.screen[1] = y; \ vLeft.screen[1] = vRight.screen[1] = y; \
\ \
if (vLeft.screen[0] < vRight.screen[0]) { \ if (vLeft.screen[0] < vRight.screen[0]) { \
FUNC_SCANLINE(tex, &vLeft, &vRight, vDy20.texcoord[0], vDy20.texcoord[1]); \ FUNC_SCANLINE(tex, &vLeft, &vRight, vDy02.texcoord[0], vDy02.texcoord[1]); \
} \ } \
else { \ else { \
FUNC_SCANLINE(tex, &vRight, &vLeft, vDy20.texcoord[0], vDy20.texcoord[1]); \ FUNC_SCANLINE(tex, &vRight, &vLeft, vDy02.texcoord[0], vDy02.texcoord[1]); \
} \ } \
\ \
sw_add_vertex_grad_PTCH(&vLeft, &vDy20); \ sw_add_vertex_grad_PTCH(&vLeft, &vDy02); \
vLeft.screen[0] += dx02; \ vLeft.screen[0] += dx02; \
\ \
sw_add_vertex_grad_PTCH(&vRight, &vDy10); \ sw_add_vertex_grad_PTCH(&vRight, &vDy01); \
vRight.screen[0] += dx01; \ vRight.screen[0] += dx01; \
} \ } \
\ \
@ -2622,16 +2622,16 @@ static inline void FUNC_NAME(const sw_vertex_t* v0, const sw_vertex_t* v1, const
vLeft.screen[1] = vRight.screen[1] = y; \ vLeft.screen[1] = vRight.screen[1] = y; \
\ \
if (vLeft.screen[0] < vRight.screen[0]) { \ if (vLeft.screen[0] < vRight.screen[0]) { \
FUNC_SCANLINE(tex, &vLeft, &vRight, vDy20.texcoord[0], vDy20.texcoord[1]); \ FUNC_SCANLINE(tex, &vLeft, &vRight, vDy02.texcoord[0], vDy02.texcoord[1]); \
} \ } \
else { \ else { \
FUNC_SCANLINE(tex, &vRight, &vLeft, vDy20.texcoord[0], vDy20.texcoord[1]); \ FUNC_SCANLINE(tex, &vRight, &vLeft, vDy02.texcoord[0], vDy02.texcoord[1]); \
} \ } \
\ \
sw_add_vertex_grad_PTCH(&vLeft, &vDy20); \ sw_add_vertex_grad_PTCH(&vLeft, &vDy02); \
vLeft.screen[0] += dx02; \ vLeft.screen[0] += dx02; \
\ \
sw_add_vertex_grad_PTCH(&vRight, &vDy21); \ sw_add_vertex_grad_PTCH(&vRight, &vDy12); \
vRight.screen[0] += dx12; \ vRight.screen[0] += dx12; \
} \ } \
} }