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Merge branch 'FasterRGBAInterpolation' into 'master'

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Simplify RGBA interpolation by avoiding a multiply and division by 255

See merge request simulant/GLdc!118
This commit is contained in:
Luke Benstead 2024-06-07 11:59:35 +00:00
commit 0a9be0b42a
1 changed files with 4 additions and 8 deletions
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12
GL/platforms/sh4.c
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@ -126,7 +126,6 @@ static inline void _glPushHeaderOrVertex(Vertex* v) {
}
static inline void _glClipEdge(const Vertex* const v1, const Vertex* const v2, Vertex* vout) {
const static float o = 0.003921569f; // 1 / 255
const float d0 = v1->w + v1->xyz[2];
const float d1 = v2->w + v2->xyz[2];
const float t = (fabs(d0) * (1.0f / sqrtf((d1 - d0) * (d1 - d0))));
@ -142,13 +141,10 @@ static inline void _glClipEdge(const Vertex* const v1, const Vertex* const v2, V
vout->w = invt * v1->w + t * v2->w;
const float m = 255 * t;
const float n = 255 - m;
vout->bgra[0] = (v1->bgra[0] * n + v2->bgra[0] * m) * o;
vout->bgra[1] = (v1->bgra[1] * n + v2->bgra[1] * m) * o;
vout->bgra[2] = (v1->bgra[2] * n + v2->bgra[2] * m) * o;
vout->bgra[3] = (v1->bgra[3] * n + v2->bgra[3] * m) * o;
vout->bgra[0] = invt * v1->bgra[0] + t * v2->bgra[0];
vout->bgra[1] = invt * v1->bgra[1] + t * v2->bgra[1];
vout->bgra[2] = invt * v1->bgra[2] + t * v2->bgra[2];
vout->bgra[3] = invt * v1->bgra[3] + t * v2->bgra[3];
}
#define SPAN_SORT_CFG 0x005F8030