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/*
* This file is part of rasdaman community.
*
* Rasdaman community is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* Rasdaman community is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with rasdaman community. If not, see <http://www.gnu.org/licenses/>.
*
* Copyright 2003, 2004, 2005, 2006, 2007, 2008, 2009 Peter Baumann /
rasdaman GmbH.
*
* For more information please see <http://www.rasdaman.org>
* or contact Peter Baumann via <baumann@rasdaman.com>.
/
/**
* COMMENTS:
*
* This is called from within cube_render.c to render a line. It has been
* moved out here to be able to easily optimise the whole system for various
* settings and simplify the use of different texture base sizes.
*/
i = (8 - (ge->midx + renderDesc->left_p)) & 7;
if ((i > width) || (width < 8)) i = width;
while (i > 0)
{
width -= i;
nom -= ((real_t)i) * left_g->z; den -= ((real_t)i) * deltaLR_g.z; h = 0.0;
if (den != 0)
{
h = -nom/den;
if (h < 0.0) h = 0.0;
if (h > 1.0) h = 1.0;
}
#ifndef TEXEL_CONST_X
dtx = ((int32)(left_t->x + h * deltaLR_t.x) - tx) / i;
#endif
#ifndef TEXEL_CONST_Y
dty = ((int32)(left_t->y + h * deltaLR_t.y) - ty) / i;
#endif
#ifndef TEXEL_CONST_Z
dtz = ((int32)(left_t->z + h * deltaLR_t.z) - tz) / i;
#endif
while (i > 0)
{
#if (CUBE_RENDER_DEBUG > 2)
printf("\t(%d, %d, %d: %d)\n", (tx>>FIXPOINT_PREC), (ty>>FIXPOINT_PREC), (tz>>FIXPOINT_PREC), ((tx>>FIXPOINT_PREC)*dimy + (ty>>FIXPOINT_PREC))*dimz + (tz>>FIXPOINT_PREC)); fflush(stdout);
#endif
#if (CUBE_RENDER_DEBUG > 0)
if (((tx>>FIXPOINT_PREC)*dimy + (ty>>FIXPOINT_PREC))*dimz + (tz>>FIXPOINT_PREC) > high_tide_src)
{
printf("Texture buffer overflow (%d, %d, %d) | (%f, %f, %f)!\n", (tx>>FIXPOINT_PREC), (ty>>FIXPOINT_PREC), (tz>>FIXPOINT_PREC), left_t->x + deltaLR_t.x, left_t->y + deltaLR_t.y, left_t->z + deltaLR_t.z); fflush(stdout); break;
}
if (dest.c > high_tide_dest)
{
printf("Screen buffer overflow (%d)!\n", (int)(high_tide_dest - (uint8*)(ge->dest)));
fflush(stdout); break;
}
#endif
TEXEL_ASSIGN;
i--;
}
if (width < 8) i = width;
}
if (width <= 0) continue;
/* The above loop guarantees that at this point width >= 8 */
dn = (real_t)(-8.0 * left_g->z); dd = (real_t)(-8.0 * deltaLR_g.z);
nom += dn; den += dd; h = 0.0;
if (den != 0)
{
h = -nom/den;
if (h < 0.0) h = 0.0;
if (h > 1.0) h = 1.0;
}
#ifndef TEXEL_CONST_X
dtx = ((int32)(left_t->x + h * deltaLR_t.x) - tx) / 8;
#endif
#ifndef TEXEL_CONST_Y
dty = ((int32)(left_t->y + h * deltaLR_t.y) - ty) / 8;
#endif
#ifndef TEXEL_CONST_Z
dtz = ((int32)(left_t->z + h * deltaLR_t.z) - tz) / 8;
#endif
/* Help the compiler do efficient Int/FP parallelism. */
while (width >= 16)
{
width -= 8; h = 0.0;
nom += dn;
TEXEL_ACCU_0(accu_t);
den += dd;
TEXEL_ACCU_1(accu_t);
if (den != 0) h = -nom/den;
TEXEL_ACCU_2(accu_t);
if (h < 0.0) h = 0.0;
TEXEL_ACCU_3(accu_t);
if (h > 1.0) h = 1.0;
TEXEL_ACCU_0(accu_t);
#ifndef TEXEL_CONST_X
ntx = (int32)(left_t->x + h * deltaLR_t.x);
#endif
TEXEL_ACCU_1(accu_t);
#ifndef TEXEL_CONST_Y
nty = (int32)(left_t->y + h * deltaLR_t.y);
#endif
TEXEL_ACCU_2(accu_t);
#ifndef TEXEL_CONST_Z
ntz = (int32)(left_t->z + h * deltaLR_t.z);
#endif
TEXEL_ACCU_3(accu_t);
#ifndef TEXEL_CONST_X
dtx = (ntx - tx) / 8;
#endif
#ifndef TEXEL_CONST_Y
dty = (nty - ty) / 8;
#endif
#ifndef TEXEL_CONST_Z
dtz = (ntz - tz) / 8;
#endif
}
/* 8 <= width <= 15 here! */
width -= 8; h = 0.0;
nom -= ((real_t)width) * left_g->z;
TEXEL_ACCU_0(accu_t);
den -= ((real_t)width) * deltaLR_g.z;
TEXEL_ACCU_1(accu_t);
if (den != 0) h = -nom/den;
TEXEL_ACCU_2(accu_t);
if (h < 0.0) h = 0.0;
TEXEL_ACCU_3(accu_t);
if (h > 1.0) h = 1.0;
TEXEL_ACCU_0(accu_t);
#ifndef TEXEL_CONST_X
ntx = (int32)(left_t->x + h * deltaLR_t.x);
#endif
TEXEL_ACCU_1(accu_t);
#ifndef TEXEL_CONST_Y
nty = (int32)(left_t->y + h * deltaLR_t.y);
#endif
TEXEL_ACCU_2(accu_t);
#ifndef TEXEL_CONST_Z
ntz = (int32)(left_t->z + h * deltaLR_t.z);
#endif
TEXEL_ACCU_3(accu_t);
if (width > 0)
{
#ifndef TEXEL_CONST_X
dtx = (ntx - tx) / width;
#endif
#ifndef TEXEL_CONST_Y
dty = (nty - ty) / width;
#endif
#ifndef TEXEL_CONST_Z
dtz = (ntz - tz) / width;
#endif
while (width > 0)
{
TEXEL_ASSIGN;
width--;
}
}
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