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apply perspective correction to colors

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This commit is contained in:
Bigfoot71 2025-03-12 18:32:36 +01:00
parent f305490c33
commit b70f02fdf2
1 changed files with 8 additions and 2 deletions
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10
src/external/rlsw.h vendored
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@ -930,6 +930,12 @@ void sw_project_and_clip_triangle(sw_vertex_t polygon[SW_MAX_CLIPPED_POLYGON_VER
v->texcoord[0] *= v->homogeneous[3];
v->texcoord[1] *= v->homogeneous[3];
// Division of colors (perspective correct)
v->color[0] *= v->homogeneous[3];
v->color[1] *= v->homogeneous[3];
v->color[2] *= v->homogeneous[3];
v->color[3] *= v->homogeneous[3];
// Transform to screen space
v->screen[0] = RLSW.vpPos[0] + (v->homogeneous[0] + 1.0f) * 0.5f * RLSW.vpDim[0];
v->screen[1] = RLSW.vpPos[1] + (v->homogeneous[1] + 1.0f) * 0.5f * RLSW.vpDim[1];
@ -1012,7 +1018,7 @@ void FUNC_NAME(const sw_texture_t* tex, const sw_vertex_t* start,
/* Interpolate the color and modulate by the texture color */ \
for (int i = 0; i < 4; i++) { \
float finalColor = texColor[i]; \
finalColor *= start->color[i] + t * dcol[i]; \
finalColor *= (start->color[i] + t * dcol[i]) * w; \
dst[i] = (uint8_t)(sw_saturate(finalColor) * 255.0f); \
} \
} \
@ -1020,7 +1026,7 @@ void FUNC_NAME(const sw_texture_t* tex, const sw_vertex_t* start,
{ \
/* Interpolate the color */ \
for (int i = 0; i < 4; i++) { \
float finalColor = start->color[i] + t * dcol[i]; \
float finalColor = (start->color[i] + t * dcol[i]) * w; \
dst[i] = (uint8_t)(sw_saturate(finalColor) * 255.0f); \
} \
} \