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TINYGL: Merge dead kInterpST code path into kInterpSTZ one.

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Texture coordinates interpolation along Z coordinate is an extra behaviour
over texture coordinates interpolation along X and Y coordinates.
This commit is contained in:
Vincent Pelletier 2016-07-25 22:59:45 +02:00
parent 369332e464
commit e7e1df886e
1 changed files with 25 additions and 48 deletions
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73
graphics/tinygl/ztriangle.cpp
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@ -140,9 +140,6 @@ void FrameBuffer::fillTriangle(ZBufferPoint *p0, ZBufferPoint *p1, ZBufferPoint
int b1 = 0, dbdx = 0, dbdy = 0, dbdl_min = 0, dbdl_max = 0;
int a1 = 0, dadx = 0, dady = 0, dadl_min = 0, dadl_max = 0;
int s1 = 0, dsdx = 0, dsdy = 0, dsdl_min = 0, dsdl_max = 0;
int t1 = 0, dtdx = 0, dtdy = 0, dtdl_min = 0, dtdl_max = 0;
float sz1 = 0.0, dszdx = 0, dszdy = 0, dszdl_min = 0.0, dszdl_max = 0.0;
float tz1 = 0.0, dtzdx = 0, dtzdy = 0, dtzdl_min = 0.0, dtzdl_max = 0.0;
@ -210,29 +207,26 @@ void FrameBuffer::fillTriangle(ZBufferPoint *p0, ZBufferPoint *p1, ZBufferPoint
dady = (int)(fdx1 * d2 - fdx2 * d1);
}
if (kInterpST) {
d1 = (float)(p1->s - p0->s);
d2 = (float)(p2->s - p0->s);
dsdx = (int)(fdy2 * d1 - fdy1 * d2);
dsdy = (int)(fdx1 * d2 - fdx2 * d1);
d1 = (float)(p1->t - p0->t);
d2 = (float)(p2->t - p0->t);
dtdx = (int)(fdy2 * d1 - fdy1 * d2);
dtdy = (int)(fdx1 * d2 - fdx2 * d1);
}
if (kInterpSTZ) {
float zz;
zz = (float)p0->z;
p0->sz = (float)p0->s * zz;
p0->tz = (float)p0->t * zz;
zz = (float)p1->z;
p1->sz = (float)p1->s * zz;
p1->tz = (float)p1->t * zz;
zz = (float)p2->z;
p2->sz = (float)p2->s * zz;
p2->tz = (float)p2->t * zz;
if (kInterpST || kInterpSTZ) {
if (kInterpSTZ) {
float zz;
zz = (float)p0->z;
p0->sz = (float)p0->s * zz;
p0->tz = (float)p0->t * zz;
zz = (float)p1->z;
p1->sz = (float)p1->s * zz;
p1->tz = (float)p1->t * zz;
zz = (float)p2->z;
p2->sz = (float)p2->s * zz;
p2->tz = (float)p2->t * zz;
} else {
p0->sz = (float)p0->s;
p0->tz = (float)p0->t;
p1->sz = (float)p1->s;
p1->tz = (float)p1->t;
p2->sz = (float)p2->s;
p2->tz = (float)p2->t;
}
d1 = p1->sz - p0->sz;
d2 = p2->sz - p0->sz;
@ -359,17 +353,7 @@ void FrameBuffer::fillTriangle(ZBufferPoint *p0, ZBufferPoint *p1, ZBufferPoint
dadl_max = dadl_min + dadx;
}
if (kInterpST) {
s1 = l1->s;
dsdl_min = (dsdy + dsdx * dxdy_min);
dsdl_max = dsdl_min + dsdx;
t1 = l1->t;
dtdl_min = (dtdy + dtdx * dxdy_min);
dtdl_max = dtdl_min + dtdx;
}
if (kInterpSTZ) {
if (kInterpST || kInterpSTZ) {
sz1 = l1->sz;
dszdl_min = (dszdy + dszdx * dxdy_min);
dszdl_max = dszdl_min + dszdx;
@ -540,6 +524,8 @@ void FrameBuffer::fillTriangle(ZBufferPoint *p0, ZBufferPoint *p1, ZBufferPoint
unsigned int s, t, z, r, g, b, a;
int n;
float sz, tz, fz, zinv;
int dsdx, dtdx;
n = (x2 >> 16) - x1;
fz = (float)z1;
zinv = (float)(1.0 / fz);
@ -615,12 +601,7 @@ void FrameBuffer::fillTriangle(ZBufferPoint *p0, ZBufferPoint *p1, ZBufferPoint
a1 += dadl_max;
}
if (kInterpST) {
s1 += dsdl_max;
t1 += dtdl_max;
}
if (kInterpSTZ) {
if (kInterpST || kInterpSTZ) {
sz1 += dszdl_max;
tz1 += dtzdl_max;
}
@ -635,11 +616,7 @@ void FrameBuffer::fillTriangle(ZBufferPoint *p0, ZBufferPoint *p1, ZBufferPoint
b1 += dbdl_min;
a1 += dadl_min;
}
if (kInterpST) {
s1 += dsdl_min;
t1 += dtdl_min;
}
if (kInterpSTZ) {
if (kInterpST || kInterpSTZ) {
sz1 += dszdl_min;
tz1 += dtzdl_min;
}