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sample plane equations at fragment centers, not lower-left corner

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This commit is contained in:
Brian Paul
2001-05-07 16:01:59 +00:00
parent c5e907e501
commit dae62174c5
1 changed files with 41 additions and 37 deletions
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src/mesa/swrast/s_aatritemp.h
+41 -37
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@@ -1,4 +1,4 @@
/* $Id: s_aatritemp.h,v 1.10 2001/05/03 22:13:32 brianp Exp $ */
/* $Id: s_aatritemp.h,v 1.11 2001/05/07 16:01:59 brianp Exp $ */
/*
* Mesa 3-D graphics library
@@ -268,34 +268,36 @@
ix = startX;
count = 0;
while (coverage > 0.0F) {
/* (cx,cy) = center of fragment */
const GLfloat cx = ix + 0.5F, cy = iy + 0.5F;
#ifdef DO_Z
z[count] = (GLdepth) solve_plane(ix, iy, zPlane);
fog[count] = solve_plane(ix, iy, fogPlane);
z[count] = (GLdepth) solve_plane(cx, cy, zPlane);
fog[count] = solve_plane(cx, cy, fogPlane);
#endif
#ifdef DO_RGBA
rgba[count][RCOMP] = solve_plane_chan(ix, iy, rPlane);
rgba[count][GCOMP] = solve_plane_chan(ix, iy, gPlane);
rgba[count][BCOMP] = solve_plane_chan(ix, iy, bPlane);
rgba[count][ACOMP] = (GLchan) (solve_plane_chan(ix, iy, aPlane) * coverage);
rgba[count][RCOMP] = solve_plane_chan(cx, cy, rPlane);
rgba[count][GCOMP] = solve_plane_chan(cx, cy, gPlane);
rgba[count][BCOMP] = solve_plane_chan(cx, cy, bPlane);
rgba[count][ACOMP] = (GLchan) (solve_plane_chan(cx, cy, aPlane) * coverage);
#endif
#ifdef DO_INDEX
{
GLint frac = compute_coveragei(pMin, pMid, pMax, ix, iy);
GLint indx = (GLint) solve_plane(ix, iy, iPlane);
GLint indx = (GLint) solve_plane(cx, cy, iPlane);
index[count] = (indx & ~0xf) | frac;
}
#endif
#ifdef DO_SPEC
spec[count][RCOMP] = solve_plane_chan(ix, iy, srPlane);
spec[count][GCOMP] = solve_plane_chan(ix, iy, sgPlane);
spec[count][BCOMP] = solve_plane_chan(ix, iy, sbPlane);
spec[count][RCOMP] = solve_plane_chan(cx, cy, srPlane);
spec[count][GCOMP] = solve_plane_chan(cx, cy, sgPlane);
spec[count][BCOMP] = solve_plane_chan(cx, cy, sbPlane);
#endif
#ifdef DO_TEX
{
GLfloat invQ = solve_plane_recip(ix, iy, vPlane);
s[count] = solve_plane(ix, iy, sPlane) * invQ;
t[count] = solve_plane(ix, iy, tPlane) * invQ;
u[count] = solve_plane(ix, iy, uPlane) * invQ;
const GLfloat invQ = solve_plane_recip(cx, cy, vPlane);
s[count] = solve_plane(cx, cy, sPlane) * invQ;
t[count] = solve_plane(cx, cy, tPlane) * invQ;
u[count] = solve_plane(cx, cy, uPlane) * invQ;
lambda[count] = compute_lambda(sPlane, tPlane, invQ,
texWidth, texHeight);
}
@@ -304,10 +306,10 @@
GLuint unit;
for (unit = 0; unit < ctx->Const.MaxTextureUnits; unit++) {
if (ctx->Texture.Unit[unit]._ReallyEnabled) {
GLfloat invQ = solve_plane_recip(ix, iy, vPlane[unit]);
s[unit][count] = solve_plane(ix, iy, sPlane[unit]) * invQ;
t[unit][count] = solve_plane(ix, iy, tPlane[unit]) * invQ;
u[unit][count] = solve_plane(ix, iy, uPlane[unit]) * invQ;
GLfloat invQ = solve_plane_recip(cx, cy, vPlane[unit]);
s[unit][count] = solve_plane(cx, cy, sPlane[unit]) * invQ;
t[unit][count] = solve_plane(cx, cy, tPlane[unit]) * invQ;
u[unit][count] = solve_plane(cx, cy, uPlane[unit]) * invQ;
lambda[unit][count] = compute_lambda(sPlane[unit],
tPlane[unit], invQ, texWidth[unit], texHeight[unit]);
}
@@ -384,34 +386,36 @@
ix = startX;
count = 0;
while (coverage > 0.0F) {
/* (cx,cy) = center of fragment */
const GLfloat cx = ix + 0.5F, cy = iy + 0.5F;
#ifdef DO_Z
z[ix] = (GLdepth) solve_plane(ix, iy, zPlane);
fog[ix] = solve_plane(ix, iy, fogPlane);
z[ix] = (GLdepth) solve_plane(cx, cy, zPlane);
fog[ix] = solve_plane(cx, cy, fogPlane);
#endif
#ifdef DO_RGBA
rgba[ix][RCOMP] = solve_plane_chan(ix, iy, rPlane);
rgba[ix][GCOMP] = solve_plane_chan(ix, iy, gPlane);
rgba[ix][BCOMP] = solve_plane_chan(ix, iy, bPlane);
rgba[ix][ACOMP] = (GLchan) (solve_plane_chan(ix, iy, aPlane) * coverage);
rgba[ix][RCOMP] = solve_plane_chan(cx, cy, rPlane);
rgba[ix][GCOMP] = solve_plane_chan(cx, cy, gPlane);
rgba[ix][BCOMP] = solve_plane_chan(cx, cy, bPlane);
rgba[ix][ACOMP] = (GLchan) (solve_plane_chan(cx, cy, aPlane) * coverage);
#endif
#ifdef DO_INDEX
{
GLint frac = compute_coveragei(pMin, pMax, pMid, ix, iy);
GLint indx = (GLint) solve_plane(ix, iy, iPlane);
GLint indx = (GLint) solve_plane(cx, cy, iPlane);
index[ix] = (indx & ~0xf) | frac;
}
#endif
#ifdef DO_SPEC
spec[ix][RCOMP] = solve_plane_chan(ix, iy, srPlane);
spec[ix][GCOMP] = solve_plane_chan(ix, iy, sgPlane);
spec[ix][BCOMP] = solve_plane_chan(ix, iy, sbPlane);
spec[ix][RCOMP] = solve_plane_chan(cx, cy, srPlane);
spec[ix][GCOMP] = solve_plane_chan(cx, cy, sgPlane);
spec[ix][BCOMP] = solve_plane_chan(cx, cy, sbPlane);
#endif
#ifdef DO_TEX
{
GLfloat invQ = solve_plane_recip(ix, iy, vPlane);
s[ix] = solve_plane(ix, iy, sPlane) * invQ;
t[ix] = solve_plane(ix, iy, tPlane) * invQ;
u[ix] = solve_plane(ix, iy, uPlane) * invQ;
const GLfloat invQ = solve_plane_recip(cx, cy, vPlane);
s[ix] = solve_plane(cx, cy, sPlane) * invQ;
t[ix] = solve_plane(cx, cy, tPlane) * invQ;
u[ix] = solve_plane(cx, cy, uPlane) * invQ;
lambda[ix] = compute_lambda(sPlane, tPlane, invQ,
texWidth, texHeight);
}
@@ -420,10 +424,10 @@
GLuint unit;
for (unit = 0; unit < ctx->Const.MaxTextureUnits; unit++) {
if (ctx->Texture.Unit[unit]._ReallyEnabled) {
GLfloat invQ = solve_plane_recip(ix, iy, vPlane[unit]);
s[unit][ix] = solve_plane(ix, iy, sPlane[unit]) * invQ;
t[unit][ix] = solve_plane(ix, iy, tPlane[unit]) * invQ;
u[unit][ix] = solve_plane(ix, iy, uPlane[unit]) * invQ;
GLfloat invQ = solve_plane_recip(cx, cy, vPlane[unit]);
s[unit][ix] = solve_plane(cx, cy, sPlane[unit]) * invQ;
t[unit][ix] = solve_plane(cx, cy, tPlane[unit]) * invQ;
u[unit][ix] = solve_plane(cx, cy, uPlane[unit]) * invQ;
lambda[unit][ix] = compute_lambda(sPlane[unit],
tPlane[unit], invQ, texWidth[unit], texHeight[unit]);
}