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DS GX: Remove per-scanline divides

This commit is contained in:
Vicki Pfau 2017-03-21 21:58:14 -07:00
parent 8792ea1354
commit ab663a24a8
2 changed files with 8 additions and 2 deletions
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2
include/mgba/internal/ds/gx/software.h
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@ -36,6 +36,7 @@ struct DSGXSoftwareEdge {
int32_t x0; // 20.12
int32_t z0; // 20.12
int32_t w0; // 20.12
int64_t wr0;
uint8_t cr0;
uint8_t cg0;
uint8_t cb0;
@ -46,6 +47,7 @@ struct DSGXSoftwareEdge {
int32_t x1; // 20.12
int32_t z1; // 20.12
int32_t w1; // 20.12
int64_t wr1;
uint8_t cr1;
uint8_t cg1;
uint8_t cb1;

8
src/ds/gx/software.c
View File

@ -313,8 +313,8 @@ static bool _edgeToSpan(struct DSGXSoftwareSpan* span, const struct DSGXSoftware
}
}
int64_t w0 = 0x7FFFFFFFFFFFFFFF / edge->w0;
int64_t w1 = 0x7FFFFFFFFFFFFFFF / edge->w1;
int64_t w0 = edge->wr0;
int64_t w1 = edge->wr1;
int64_t w = w1 - w0;
// Losslessly interpolate two 64-bit values
@ -526,6 +526,8 @@ static void _preparePoly(struct DSGXRenderer* renderer, struct DSGXVertex* verts
edge->s1 = v0->vs;
edge->t1 = v0->vt;
}
edge->wr0 = 0x7FFFFFFFFFFFFFFF / edge->w0;
edge->wr1 = 0x7FFFFFFFFFFFFFFF / edge->w1;
edge = DSGXSoftwareEdgeListAppend(&softwareRenderer->activeEdges);
edge->polyId = poly->polyId;
@ -578,6 +580,8 @@ static void _preparePoly(struct DSGXRenderer* renderer, struct DSGXVertex* verts
edge->s1 = v0->vs;
edge->t1 = v0->vt;
}
edge->wr0 = 0x7FFFFFFFFFFFFFFF / edge->w0;
edge->wr1 = 0x7FFFFFFFFFFFFFFF / edge->w1;
if (poly->maxY >= DS_VIDEO_VERTICAL_PIXELS) {
poly->maxY = DS_VIDEO_VERTICAL_PIXELS - 1;