419 lines
15 KiB
C
419 lines
15 KiB
C
#include "pieclip.h"
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#include "ivi.h"
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static BOOL bClipSpecular = TRUE;
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static UDWORD videoBufferWidth = 640, videoBufferHeight = 480;
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extern iSurface *psRendSurface;
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BOOL pie_SetVideoBuffer(UDWORD width, UDWORD height)
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{
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videoBufferWidth = width;
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videoBufferHeight = height;
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return(TRUE);
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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 int pie_ClipXT(PIEVERTEX *s1, PIEVERTEX *s2, PIEVERTEX *clip)
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{
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int n, dx;
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int32 t;
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n = 1;
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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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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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if (bClipSpecular)
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{
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clip->specular.byte.r = s1->specular.byte.r + ((t * (s2->specular.byte.r - s1->specular.byte.r)) >> iV_DIVSHIFT);
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clip->specular.byte.g = s1->specular.byte.g + ((t * (s2->specular.byte.g - s1->specular.byte.g)) >> iV_DIVSHIFT);
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clip->specular.byte.b = s1->specular.byte.b + ((t * (s2->specular.byte.b - s1->specular.byte.b)) >> iV_DIVSHIFT);
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clip->specular.byte.a = s1->specular.byte.a + ((t * (s2->specular.byte.a - s1->specular.byte.a)) >> iV_DIVSHIFT);
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}
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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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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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if (bClipSpecular) {
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clip->specular.byte.r = s1->specular.byte.r + ((t * (s2->specular.byte.r - s1->specular.byte.r)) >> iV_DIVSHIFT);
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clip->specular.byte.g = s1->specular.byte.g + ((t * (s2->specular.byte.g - s1->specular.byte.g)) >> iV_DIVSHIFT);
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clip->specular.byte.b = s1->specular.byte.b + ((t * (s2->specular.byte.b - s1->specular.byte.b)) >> iV_DIVSHIFT);
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clip->specular.byte.a = s1->specular.byte.a + ((t * (s2->specular.byte.a - s1->specular.byte.a)) >> iV_DIVSHIFT);
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}
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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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clip->tu = s1->tu + ((t * (s1->tu - s2->tu)) >> iV_DIVSHIFT);
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clip->tv = s1->tv + ((t * (s1->tv - s2->tv)) >> iV_DIVSHIFT);
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clip->sz = s1->sz + ((t * (s1->sz - s2->sz)) >> iV_DIVSHIFT);
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clip->light.byte.r = s1->light.byte.r + ((t * (s1->light.byte.r - s2->light.byte.r)) >> iV_DIVSHIFT);
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clip->light.byte.g = s1->light.byte.g + ((t * (s1->light.byte.g - s2->light.byte.g)) >> iV_DIVSHIFT);
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clip->light.byte.b = s1->light.byte.b + ((t * (s1->light.byte.b - s2->light.byte.b)) >> iV_DIVSHIFT);
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clip->light.byte.a = s1->light.byte.a + ((t * (s1->light.byte.a - s2->light.byte.a)) >> iV_DIVSHIFT);
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if (bClipSpecular)
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{
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clip->specular.byte.r = s1->specular.byte.r + ((t * (s1->specular.byte.r - s2->specular.byte.r)) >> iV_DIVSHIFT);
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clip->specular.byte.g = s1->specular.byte.g + ((t * (s1->specular.byte.g - s2->specular.byte.g)) >> iV_DIVSHIFT);
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clip->specular.byte.b = s1->specular.byte.b + ((t * (s1->specular.byte.b - s2->specular.byte.b)) >> iV_DIVSHIFT);
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clip->specular.byte.a = s1->specular.byte.a + ((t * (s1->specular.byte.a - s2->specular.byte.a)) >> iV_DIVSHIFT);
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}
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} else
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*clip = *s1;
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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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clip->tu = s1->tu + ((t * (s1->tu - s2->tu)) >> iV_DIVSHIFT);
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clip->tv = s1->tv + ((t * (s1->tv - s2->tv)) >> iV_DIVSHIFT);
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clip->sz = s1->sz + ((t * (s1->sz - s2->sz)) >> iV_DIVSHIFT);
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clip->light.byte.r = s1->light.byte.r + ((t * (s1->light.byte.r - s2->light.byte.r)) >> iV_DIVSHIFT);
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clip->light.byte.g = s1->light.byte.g + ((t * (s1->light.byte.g - s2->light.byte.g)) >> iV_DIVSHIFT);
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clip->light.byte.b = s1->light.byte.b + ((t * (s1->light.byte.b - s2->light.byte.b)) >> iV_DIVSHIFT);
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clip->light.byte.a = s1->light.byte.a + ((t * (s1->light.byte.a - s2->light.byte.a)) >> iV_DIVSHIFT);
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if (bClipSpecular)
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{
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clip->specular.byte.r = s1->specular.byte.r + ((t * (s1->specular.byte.r - s2->specular.byte.r)) >> iV_DIVSHIFT);
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clip->specular.byte.g = s1->specular.byte.g + ((t * (s1->specular.byte.g - s2->specular.byte.g)) >> iV_DIVSHIFT);
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clip->specular.byte.b = s1->specular.byte.b + ((t * (s1->specular.byte.b - s2->specular.byte.b)) >> iV_DIVSHIFT);
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clip->specular.byte.a = s1->specular.byte.a + ((t * (s1->specular.byte.a - s2->specular.byte.a)) >> iV_DIVSHIFT);
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}
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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, dy;
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int32 t;
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n = 1;
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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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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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if (bClipSpecular)
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{
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clip->specular.byte.r = s1->specular.byte.r + ((t * (s2->specular.byte.r - s1->specular.byte.r)) >> iV_DIVSHIFT);
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clip->specular.byte.g = s1->specular.byte.g + ((t * (s2->specular.byte.g - s1->specular.byte.g)) >> iV_DIVSHIFT);
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clip->specular.byte.b = s1->specular.byte.b + ((t * (s2->specular.byte.b - s1->specular.byte.b)) >> iV_DIVSHIFT);
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clip->specular.byte.a = s1->specular.byte.a + ((t * (s2->specular.byte.a - s1->specular.byte.a)) >> iV_DIVSHIFT);
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}
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} else
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*clip = *s1;
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if (s2->sy > psRendSurface->clip.bottom) {
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if (s1->sy > psRendSurface->clip.bottom) return 0;
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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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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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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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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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if (bClipSpecular)
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{
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clip->specular.byte.r = s1->specular.byte.r + ((t * (s2->specular.byte.r - s1->specular.byte.r)) >> iV_DIVSHIFT);
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clip->specular.byte.g = s1->specular.byte.g + ((t * (s2->specular.byte.g - s1->specular.byte.g)) >> iV_DIVSHIFT);
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clip->specular.byte.b = s1->specular.byte.b + ((t * (s2->specular.byte.b - s1->specular.byte.b)) >> iV_DIVSHIFT);
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clip->specular.byte.a = s1->specular.byte.a + ((t * (s2->specular.byte.a - s1->specular.byte.a)) >> iV_DIVSHIFT);
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}
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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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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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clip->tu = s1->tu + ((t * (s1->tu - s2->tu)) >> iV_DIVSHIFT);
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clip->tv = s1->tv + ((t * (s1->tv - s2->tv)) >> iV_DIVSHIFT);
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clip->sz = s1->sz + ((t * (s1->sz - s2->sz)) >> iV_DIVSHIFT);
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clip->light.byte.r = s1->light.byte.r + ((t * (s1->light.byte.r - s2->light.byte.r)) >> iV_DIVSHIFT);
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clip->light.byte.g = s1->light.byte.g + ((t * (s1->light.byte.g - s2->light.byte.g)) >> iV_DIVSHIFT);
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clip->light.byte.b = s1->light.byte.b + ((t * (s1->light.byte.b - s2->light.byte.b)) >> iV_DIVSHIFT);
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clip->light.byte.a = s1->light.byte.a + ((t * (s1->light.byte.a - s2->light.byte.a)) >> iV_DIVSHIFT);
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if (bClipSpecular)
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{
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clip->specular.byte.r = s1->specular.byte.r + ((t * (s1->specular.byte.r - s2->specular.byte.r)) >> iV_DIVSHIFT);
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clip->specular.byte.g = s1->specular.byte.g + ((t * (s1->specular.byte.g - s2->specular.byte.g)) >> iV_DIVSHIFT);
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clip->specular.byte.b = s1->specular.byte.b + ((t * (s1->specular.byte.b - s2->specular.byte.b)) >> iV_DIVSHIFT);
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clip->specular.byte.a = s1->specular.byte.a + ((t * (s1->specular.byte.a - s2->specular.byte.a)) >> iV_DIVSHIFT);
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}
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} else
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*clip = *s1;
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if (s2->sy < psRendSurface->clip.top) {
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if (s1->sy < psRendSurface->clip.top) return 0;
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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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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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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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clip->tu = s1->tu + ((t * (s1->tu - s2->tu)) >> iV_DIVSHIFT);
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clip->tv = s1->tv + ((t * (s1->tv - s2->tv)) >> iV_DIVSHIFT);
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clip->sz = s1->sz + ((t * (s1->sz - s2->sz)) >> iV_DIVSHIFT);
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clip->light.byte.r = s1->light.byte.r + ((t * (s1->light.byte.r - s2->light.byte.r)) >> iV_DIVSHIFT);
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clip->light.byte.g = s1->light.byte.g + ((t * (s1->light.byte.g - s2->light.byte.g)) >> iV_DIVSHIFT);
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clip->light.byte.b = s1->light.byte.b + ((t * (s1->light.byte.b - s2->light.byte.b)) >> iV_DIVSHIFT);
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clip->light.byte.a = s1->light.byte.a + ((t * (s1->light.byte.a - s2->light.byte.a)) >> iV_DIVSHIFT);
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if (bClipSpecular)
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{
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clip->specular.byte.r = s1->specular.byte.r + ((t * (s1->specular.byte.r - s2->specular.byte.r)) >> iV_DIVSHIFT);
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clip->specular.byte.g = s1->specular.byte.g + ((t * (s1->specular.byte.g - s2->specular.byte.g)) >> iV_DIVSHIFT);
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clip->specular.byte.b = s1->specular.byte.b + ((t * (s1->specular.byte.b - s2->specular.byte.b)) >> iV_DIVSHIFT);
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clip->specular.byte.a = s1->specular.byte.a + ((t * (s1->specular.byte.a - s2->specular.byte.a)) >> iV_DIVSHIFT);
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}
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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, BOOL bSpecular)
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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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bClipSpecular = bSpecular;
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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))
|
|
p1 = &points[0];
|
|
|
|
if ((p0->sx == 1<<15) || (p0->sy == -1<<15))//check for invalid points jps19aug97
|
|
return 0;
|
|
|
|
n1 += pie_ClipXT(p0,p1,&xclip[n1]);
|
|
}
|
|
|
|
p0 = &xclip[0];
|
|
p1 = &xclip[1];
|
|
|
|
for (i=0, n=0; i<n1; p0++, p1++, i++) {
|
|
if (i==(n1-1))
|
|
p1 = &xclip[0];
|
|
n += pie_ClipYT(p0,p1,&clip[n]);
|
|
}
|
|
|
|
return n;
|
|
}
|
|
|
|
//*************************************************************************
|
|
/* Alex - much faster tri clipper - won't clip owt else tho' */
|
|
int pie_ClipTexturedTriangleFast(PIEVERTEX *v1, PIEVERTEX *v2, PIEVERTEX *v3, PIEVERTEX *clipped, BOOL bSpecular)
|
|
{
|
|
static PIEVERTEX xClip[iV_POLY_MAX_POINTS+4]; // plus 4 hopefully is limit?
|
|
static PIEVERTEX *p0,*p1;
|
|
UDWORD numPreY,numAll;
|
|
UDWORD i;
|
|
|
|
bClipSpecular = bSpecular;
|
|
|
|
numPreY = 0;
|
|
if( (v1->sx > LONG_TEST) OR (v1->sy > LONG_TEST) )
|
|
{
|
|
/* bomb out for out of range points */
|
|
return(0);
|
|
}
|
|
numPreY += pie_ClipXT(v1,v2,&xClip[numPreY]);
|
|
|
|
if( (v2->sx > LONG_TEST) OR (v2->sy > LONG_TEST) )
|
|
{
|
|
/* bomb out for out of range points */
|
|
return(0);
|
|
}
|
|
numPreY += pie_ClipXT(v2,v3,&xClip[numPreY]);
|
|
|
|
if( (v3->sx > LONG_TEST) OR (v3->sy > LONG_TEST) )
|
|
{
|
|
/* bomb out for out of range points */
|
|
return(0);
|
|
}
|
|
numPreY += pie_ClipXT(v3,v1,&xClip[numPreY]);
|
|
|
|
/* We've now clipped against x axis - now for Y */
|
|
|
|
p0 = &xClip[0];
|
|
p1 = &xClip[1];
|
|
|
|
for (i=0, numAll=0; i<numPreY; p0++, p1++, i++) {
|
|
if (i==(numPreY-1))
|
|
p1 = &xClip[0];
|
|
numAll += pie_ClipYT(p0,p1,&clipped[numAll]);
|
|
}
|
|
|
|
return numAll;
|
|
}
|