356 lines
7.7 KiB
C
356 lines
7.7 KiB
C
/*
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This file is part of Warzone 2100.
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Copyright (C) 1999-2004 Eidos Interactive
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Copyright (C) 2005-2007 Warzone Resurrection Project
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Warzone 2100 is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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Warzone 2100 is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with Warzone 2100; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "pieclip.h"
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#include "ivi.h"
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static UDWORD videoBufferDepth = 32, videoBufferWidth = 640, videoBufferHeight = 480;
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extern iSurface *psRendSurface;
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BOOL pie_SetVideoBufferDepth(UDWORD depth)
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{
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videoBufferDepth = depth;
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return(TRUE);
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}
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BOOL pie_SetVideoBufferWidth(UDWORD width)
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{
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videoBufferWidth = width;
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return(TRUE);
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}
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BOOL pie_SetVideoBufferHeight(UDWORD height)
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{
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videoBufferHeight = height;
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return(TRUE);
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}
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UDWORD pie_GetVideoBufferDepth(void)
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{
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return(videoBufferDepth);
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}
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UDWORD pie_GetVideoBufferWidth(void)
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{
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return(videoBufferWidth);
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}
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UDWORD pie_GetVideoBufferHeight(void)
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{
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return(videoBufferHeight);
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}
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void pie_Set2DClip(int x0, int y0, int x1, int y1)
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{
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psRendSurface->clip.left = x0;
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psRendSurface->clip.top = y0;
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psRendSurface->clip.right = x1;
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psRendSurface->clip.bottom = y1;
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}
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static void pie_ClipUV(PIEVERTEX *s1, PIEVERTEX *s2, PIEVERTEX *clip, Sint32 t)
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{
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clip->tu = s1->tu + ((t * (s2->tu - s1->tu)) >> iV_DIVSHIFT);
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clip->tv = s1->tv + ((t * (s2->tv - s1->tv)) >> iV_DIVSHIFT);
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clip->sz = s1->sz + ((t * (s2->sz - s1->sz)) >> iV_DIVSHIFT);
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clip->light.byte.r = s1->light.byte.r + ((t * (s2->light.byte.r - s1->light.byte.r)) >> iV_DIVSHIFT);
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clip->light.byte.g = s1->light.byte.g + ((t * (s2->light.byte.g - s1->light.byte.g)) >> iV_DIVSHIFT);
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clip->light.byte.b = s1->light.byte.b + ((t * (s2->light.byte.b - s1->light.byte.b)) >> iV_DIVSHIFT);
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clip->light.byte.a = s1->light.byte.a + ((t * (s2->light.byte.a - s1->light.byte.a)) >> iV_DIVSHIFT);
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}
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static int pie_ClipXT(PIEVERTEX *s1, PIEVERTEX *s2, PIEVERTEX *clip)
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{
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int n = 1, dx;
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Sint32 t;
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if (s2->sx >= s1->sx) {
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if (s1->sx < psRendSurface->clip.left) {
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if (s2->sx <= psRendSurface->clip.left)
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return 0;
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dx = s2->sx - s1->sx;
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if (dx != 0)
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clip->sy = s1->sy + (s2->sy - s1->sy) * (psRendSurface->clip.left - s1->sx) / dx;
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else
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clip->sy = s1->sy;
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clip->sx = psRendSurface->clip.left;
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// clip uv
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t = ((clip->sx - s1->sx)<<iV_DIVSHIFT) / dx;
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pie_ClipUV(s1, s2, clip, t);
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} else
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*clip = *s1;
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if (s2->sx > psRendSurface->clip.right) {
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if (s1->sx > psRendSurface->clip.right)
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return 0;
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clip++;
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dx = s2->sx - s1->sx;
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if (dx != 0)
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clip->sy = s2->sy - (s2->sy - s1->sy) * (s2->sx - psRendSurface->clip.right) / dx;
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else
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clip->sy = s2->sy;
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clip->sx = psRendSurface->clip.right;
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// clip uv
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t = ((clip->sx - s1->sx)<<iV_DIVSHIFT) / dx;
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pie_ClipUV(s1, s2, clip, t);
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n = 2;
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}
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return n;
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} else {
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if (s1->sx > psRendSurface->clip.right) {
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if (s2->sx >= psRendSurface->clip.right) return 0;
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dx = s1->sx - s2->sx;
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if (dx != 0)
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clip->sy = s1->sy - (s1->sy - s2->sy) * (s1->sx - psRendSurface->clip.right) / dx;
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else
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clip->sy = s1->sy;
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clip->sx = psRendSurface->clip.right;
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// clip uv
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t = ((clip->sx - s1->sx)<<iV_DIVSHIFT) / dx;
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pie_ClipUV(s1, s2, clip, t);
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} else {
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*clip = *s1;
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}
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if (s2->sx < psRendSurface->clip.left) {
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if (s1->sx < psRendSurface->clip.left)
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return 0;
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clip++;
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dx = s1->sx - s2->sx;
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if (dx != 0)
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clip->sy = s2->sy + (s1->sy - s2->sy) * (psRendSurface->clip.left - s2->sx) / dx;
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else
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clip->sy = s2->sy;
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clip->sx = psRendSurface->clip.left;
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// clip uv
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t = ((clip->sx - s1->sx)<<iV_DIVSHIFT) / dx;
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pie_ClipUV(s1, s2, clip, t);
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n = 2;
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}
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return n;
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}
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}
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static int pie_ClipYT(PIEVERTEX *s1, PIEVERTEX *s2, PIEVERTEX *clip)
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{
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int n = 1, dy;
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Sint32 t;
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if (s2->sy >= s1->sy) {
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if (s1->sy < psRendSurface->clip.top) {
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if (s2->sy <= psRendSurface->clip.top) return 0;
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dy = s2->sy - s1->sy;
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if (dy != 0)
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clip->sx = s1->sx + (s2->sx - s1->sx) * (psRendSurface->clip.top - s1->sy) / dy;
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else
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clip->sx = s1->sx;
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clip->sy = psRendSurface->clip.top;
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// clip uv
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t = ((clip->sy - s1->sy)<<iV_DIVSHIFT) / dy;
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pie_ClipUV(s1, s2, clip, t);
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} else {
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*clip = *s1;
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}
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if (s2->sy > psRendSurface->clip.bottom)
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{
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if (s1->sy > psRendSurface->clip.bottom)
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{
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return 0;
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}
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clip++;
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dy = s2->sy - s1->sy;
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if (dy != 0)
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{
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clip->sx = s2->sx - (s2->sx - s1->sx) * (s2->sy - psRendSurface->clip.bottom) / dy;
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} else {
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clip->sx = s2->sx;
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}
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clip->sy = psRendSurface->clip.bottom;
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t = ((clip->sy - s1->sy)<<iV_DIVSHIFT) / dy;
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pie_ClipUV(s1, s2, clip, t);
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n = 2;
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}
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return n;
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} else {
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if (s1->sy > psRendSurface->clip.bottom)
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{
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if (s2->sy >= psRendSurface->clip.bottom) return 0;
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dy = s1->sy - s2->sy;
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if (dy != 0)
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clip->sx = s1->sx - (s1->sx - s2->sx) * (s1->sy - psRendSurface->clip.bottom) / dy;
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else
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clip->sx = s1->sx;
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clip->sy = psRendSurface->clip.bottom;
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// clip uv
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t = ((clip->sy - s1->sy)<<iV_DIVSHIFT) / dy;
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pie_ClipUV(s1, s2, clip, t);
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} else {
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*clip = *s1;
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}
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if (s2->sy < psRendSurface->clip.top)
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{
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if (s1->sy < psRendSurface->clip.top)
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{
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return 0;
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}
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clip++;
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dy = s1->sy - s2->sy;
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if (dy != 0)
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{
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clip->sx = s2->sx + (s1->sx - s2->sx) * (psRendSurface->clip.top - s2->sy) / dy;
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} else {
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clip->sx = s2->sx;
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}
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clip->sy = psRendSurface->clip.top;
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t = ((clip->sy - s1->sy)<<iV_DIVSHIFT) / dy;
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pie_ClipUV(s1, s2, clip, t);
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n = 2;
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}
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return n;
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}
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}
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int pie_ClipTextured(int npoints, PIEVERTEX *points, PIEVERTEX *clip)
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{
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static PIEVERTEX xclip[iV_POLY_MAX_POINTS+4];
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PIEVERTEX *p0, *p1;
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int n1, n, i;
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p0 = &points[0];
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p1 = &points[1];
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for (i=0, n1=0; i<npoints; i++, p0++, p1++) {
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if (i==(npoints-1))
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p1 = &points[0];
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if ((p0->sx == 1<<15) || (p0->sy == -1<<15))//check for invalid points jps19aug97
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return 0;
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n1 += pie_ClipXT(p0,p1,&xclip[n1]);
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}
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p0 = &xclip[0];
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p1 = &xclip[1];
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for (i=0, n=0; i<n1; p0++, p1++, i++) {
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if (i==(n1-1))
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p1 = &xclip[0];
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n += pie_ClipYT(p0,p1,&clip[n]);
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}
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return n;
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}
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#ifdef NEVER_USED_ANYWHERE
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// I leave this around just for potential inspirational purposes. - Per
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//*************************************************************************
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/* Alex - much faster tri clipper - won't clip owt else tho' */
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int pie_ClipTexturedTriangleFast(PIEVERTEX *v1, PIEVERTEX *v2, PIEVERTEX *v3, PIEVERTEX *clipped)
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{
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static PIEVERTEX xClip[iV_POLY_MAX_POINTS+4]; // plus 4 hopefully is limit?
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static PIEVERTEX *p0,*p1;
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UDWORD numPreY,numAll;
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UDWORD i;
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numPreY = 0;
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if( (v1->sx > LONG_TEST) || (v1->sy > LONG_TEST) )
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{
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/* bomb out for out of range points */
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return(0);
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}
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numPreY += pie_ClipXT(v1,v2,&xClip[numPreY]);
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if( (v2->sx > LONG_TEST) || (v2->sy > LONG_TEST) )
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{
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/* bomb out for out of range points */
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return(0);
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}
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numPreY += pie_ClipXT(v2,v3,&xClip[numPreY]);
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if( (v3->sx > LONG_TEST) || (v3->sy > LONG_TEST) )
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{
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/* bomb out for out of range points */
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return(0);
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}
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numPreY += pie_ClipXT(v3,v1,&xClip[numPreY]);
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/* We've now clipped against x axis - now for Y */
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p0 = &xClip[0];
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p1 = &xClip[1];
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for (i=0, numAll=0; i<numPreY; p0++, p1++, i++) {
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if (i==(numPreY-1))
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p1 = &xClip[0];
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numAll += pie_ClipYT(p0,p1,&clipped[numAll]);
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}
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return numAll;
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}
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#endif
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