diff options
Diffstat (limited to 'xc/extras/Mesa/src/general_clip.h')
| -rw-r--r-- | xc/extras/Mesa/src/general_clip.h | 140 |
1 files changed, 26 insertions, 114 deletions
diff --git a/xc/extras/Mesa/src/general_clip.h b/xc/extras/Mesa/src/general_clip.h index 29a8eb760..c8bc8890a 100644 --- a/xc/extras/Mesa/src/general_clip.h +++ b/xc/extras/Mesa/src/general_clip.h @@ -1,9 +1,9 @@ /* * Mesa 3-D graphics library - * Version: 3.1 + * Version: 3.3 * - * Copyright (C) 1999 Brian Paul All Rights Reserved. + * Copyright (C) 1999-2000 Brian Paul All Rights Reserved. * * Permission is hereby granted, free of charge, to any person obtaining a * copy of this software and associated documentation files (the "Software"), @@ -28,144 +28,56 @@ */ - -/* - * Clip against +X - * - * The if conditions are known at compile time. - */ -#define PLANE (CLIP_RIGHT_BIT) -#define INSIDE(K) (X(K) <= W(K)) -#define COMPUTE_INTERSECTION( in, out, new ) \ - dx = X(out)-X(in); \ - dw = W(out)-W(in); \ - t = (X(in)-W(in)) / (dw-dx); \ - neww = W(in) + t * dw; \ - X(new) = neww; \ - Y(new) = Y(in) + t * (Y(out) - Y(in)); \ - if (SIZE>=3) coord[new][2] = Z(in) + t * (Z(out) - Z(in)); \ - if (SIZE==4) coord[new][3] = neww; +#define PLANE CLIP_RIGHT_BIT +#define CLIP_DOTPROD(K) (- X(K) + W(K)) GENERAL_CLIP -#undef INSIDE +#undef CLIP_DOTPROD #undef PLANE -#undef COMPUTE_INTERSECTION -/* - * Clip against -X - */ -#define PLANE (CLIP_LEFT_BIT) -#define INSIDE(K) (X(K) >= -W(K)) -#define COMPUTE_INTERSECTION( in, out, new ) \ - dx = X(out)-X(in); \ - dw = W(out)-W(in); \ - t = -(X(in)+W(in)) / (dw+dx); \ - neww = W(in) + t * dw; \ - X(new) = -neww; \ - Y(new) = Y(in) + t * (Y(out) - Y(in)); \ - if (SIZE>=3) coord[new][2] = Z(in) + t * (Z(out) - Z(in)); \ - if (SIZE==4) coord[new][3] = neww; +#define PLANE CLIP_LEFT_BIT +#define CLIP_DOTPROD(K) (X(K) + W(K)) GENERAL_CLIP -#undef INSIDE +#undef CLIP_DOTPROD #undef PLANE -#undef COMPUTE_INTERSECTION - -/* - * Clip against +Y - */ -#define PLANE (CLIP_TOP_BIT) -#define INSIDE(K) (Y(K) <= W(K)) -#define COMPUTE_INTERSECTION( in, out, new ) \ - dy = Y(out)-Y(in); \ - dw = W(out)-W(in); \ - t = (Y(in)-W(in)) / (dw-dy); \ - neww = W(in) + t * dw; \ - X(new) = X(in) + t * (X(out) - X(in)); \ - Y(new) = neww; \ - if (SIZE>=3) coord[new][2] = Z(in) + t * (Z(out) - Z(in)); \ - if (SIZE==4) coord[new][3] = neww; +#define PLANE CLIP_TOP_BIT +#define CLIP_DOTPROD(K) (- Y(K) + W(K)) GENERAL_CLIP -#undef INSIDE +#undef CLIP_DOTPROD #undef PLANE -#undef COMPUTE_INTERSECTION - -/* - * Clip against -Y - */ -#define PLANE (CLIP_BOTTOM_BIT) -#define INSIDE(K) (Y(K) >= -W(K)) -#define COMPUTE_INTERSECTION( in, out, new ) \ - dy = Y(out)-Y(in); \ - dw = W(out)-W(in); \ - t = -(Y(in)+W(in)) / (dw+dy); \ - neww = W(in) + t * dw; \ - X(new) = X(in) + t * (X(out) - X(in)); \ - Y(new) = -neww; \ - if (SIZE>=3) coord[new][2] = Z(in) + t * (Z(out) - Z(in)); \ - if (SIZE==4) coord[new][3] = neww; +#define PLANE CLIP_BOTTOM_BIT +#define CLIP_DOTPROD(K) (Y(K) + W(K)) GENERAL_CLIP -#undef INSIDE +#undef CLIP_DOTPROD #undef PLANE -#undef COMPUTE_INTERSECTION - +#define PLANE CLIP_FAR_BIT +#define CLIP_DOTPROD(K) (- Z(K) + W(K)) -/* - * Clip against +Z - */ -#define PLANE (CLIP_FAR_BIT) -#define INSIDE(K) (Z(K) <= W(K)) -#define COMPUTE_INTERSECTION( in, out, new ) \ - dz = Z(out)-Z(in); \ - dw = W(out)-W(in); \ - t = (Z(in)-W(in)) / (dw-dz); \ - neww = W(in) + t * dw; \ - X(new) = X(in) + t * (X(out) - X(in)); \ - Y(new) = Y(in) + t * (Y(out) - Y(in)); \ - coord[new][2] = neww; \ - if (SIZE==4) coord[new][3] = neww; - - if (SIZE>=3) { - GENERAL_CLIP - } + if (SIZE >= 3) { + GENERAL_CLIP + } -#undef INSIDE +#undef CLIP_DOTPROD #undef PLANE -#undef COMPUTE_INTERSECTION +#define PLANE CLIP_NEAR_BIT +#define CLIP_DOTPROD(K) (Z(K) + W(K)) -/* - * Clip against -Z - */ -#define PLANE (CLIP_NEAR_BIT) -#define INSIDE(K) (Z(K) >= -W(K)) -#define COMPUTE_INTERSECTION( in, out, new ) \ - dz = Z(out)-Z(in); \ - dw = W(out)-W(in); \ - t = -(Z(in)+W(in)) / (dw+dz); \ - neww = W(in) + t * dw; \ - X(new) = X(in) + t * (X(out) - X(in)); \ - Y(new) = Y(in) + t * (Y(out) - Y(in)); \ - coord[new][2] = -neww; \ - if (SIZE==4) coord[new][3] = neww; - - if (SIZE>=3) { - GENERAL_CLIP - } + if (SIZE >=3 ) { + GENERAL_CLIP + } -#undef INSIDE +#undef CLIP_DOTPROD #undef PLANE -#undef COMPUTE_INTERSECTION #undef GENERAL_CLIP - - |