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path: root/src/mesa/pipe/softpipe/g_prim_clip.c
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-rw-r--r--src/mesa/pipe/softpipe/g_prim_clip.c429
1 files changed, 0 insertions, 429 deletions
diff --git a/src/mesa/pipe/softpipe/g_prim_clip.c b/src/mesa/pipe/softpipe/g_prim_clip.c
deleted file mode 100644
index 742def9c7d..0000000000
--- a/src/mesa/pipe/softpipe/g_prim_clip.c
+++ /dev/null
@@ -1,429 +0,0 @@
-/**************************************************************************
- *
- * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.
- * 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"), to deal in the Software without restriction, including
- * without limitation the rights to use, copy, modify, merge, publish,
- * distribute, sub license, and/or sell copies of the Software, and to
- * permit persons to whom the Software is furnished to do so, subject to
- * the following conditions:
- *
- * The above copyright notice and this permission notice (including the
- * next paragraph) shall be included in all copies or substantial portions
- * of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
- * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
- * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
- * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
- * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
- * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
- * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
- *
- **************************************************************************/
-
-/* Authors: Keith Whitwell <keith@tungstengraphics.com>
- */
-
-#include "imports.h"
-#include "macros.h"
-
-#include "g_context.h"
-#include "g_prim.h"
-
-struct clipper {
- struct prim_stage stage;
-
- GLuint active_user_planes;
-};
-
-/* This is a bit confusing:
- */
-static INLINE struct clipper *clipper_stage( struct prim_stage *stage )
-{
- return (struct clipper *)stage;
-}
-
-
-#define LINTERP(T, OUT, IN) ((OUT) + (T) * ((IN) - (OUT)))
-
-
-/* All attributes are float[4], so this is easy:
- */
-static void interp_attr( GLfloat *fdst,
- GLfloat t,
- const GLfloat *fin,
- const GLfloat *fout )
-{
- fdst[0] = LINTERP( t, fout[0], fin[0] );
- fdst[1] = LINTERP( t, fout[1], fin[1] );
- fdst[2] = LINTERP( t, fout[2], fin[2] );
- fdst[3] = LINTERP( t, fout[3], fin[3] );
-}
-
-
-
-
-/* Interpolate between two vertices to produce a third.
- */
-static void interp( struct clipper *clip,
- struct vertex_header *dst,
- GLfloat t,
- const struct vertex_header *out,
- const struct vertex_header *in )
-{
- const GLuint nr_attrs = clip->stage.generic->nr_attrs;
- GLuint j;
-
- /* Vertex header.
- */
- {
- dst->clipmask = 0;
- dst->edgeflag = 0;
- dst->pad = 0;
- }
-
- /* Clip coordinates: interpolate normally
- */
- {
- interp_attr(dst->clip, t, in->clip, out->clip);
- }
-
- /* Do the projective divide and insert window coordinates:
- */
- {
- const GLfloat *pos = dst->clip;
- const GLfloat *scale = clip->stage.generic->viewport.scale;
- const GLfloat *trans = clip->stage.generic->viewport.translate;
- GLfloat oow;
-
- oow = 1.0 / pos[3];
-
- dst->data[0][0] = pos[0] * oow * scale[0] + trans[0];
- dst->data[0][1] = pos[1] * oow * scale[1] + trans[1];
- dst->data[0][2] = pos[2] * oow * scale[2] + trans[2];
- dst->data[0][3] = oow;
- }
-
-
- /* Other attributes
- */
- for (j = 1; j < nr_attrs-1; j++) {
- interp_attr(dst->data[j], t, in->data[j], out->data[j]);
- }
-}
-
-
-#define CLIP_USER_BIT 0x40
-#define CLIP_CULL_BIT 0x80
-
-
-static INLINE GLfloat dot4( const GLfloat *a,
- const GLfloat *b )
-{
- GLfloat result = (a[0]*b[0] +
- a[1]*b[1] +
- a[2]*b[2] +
- a[3]*b[3]);
-
- return result;
-}
-
-
-#if 0
-static INLINE void do_tri( struct prim_stage *next,
- struct prim_header *header )
-{
- GLuint i;
- for (i = 0; i < 3; i++) {
- GLfloat *ndc = header->v[i]->data[0];
- _mesa_printf("ndc %f %f %f\n", ndc[0], ndc[1], ndc[2]);
- assert(ndc[0] >= -1 && ndc[0] <= 641);
- assert(ndc[1] >= 30 && ndc[1] <= 481);
- }
- _mesa_printf("\n");
- next->tri(next, header);
-}
-#endif
-
-
-static void emit_poly( struct prim_stage *stage,
- struct vertex_header **inlist,
- GLuint n )
-{
- struct prim_header header;
- GLuint i;
-
- for (i = 2; i < n; i++) {
- header.v[0] = inlist[0];
- header.v[1] = inlist[i-1];
- header.v[2] = inlist[i];
-
- {
- GLuint tmp0 = header.v[0]->edgeflag;
- GLuint tmp2 = header.v[2]->edgeflag;
-
- if (i != 2) header.v[0]->edgeflag = 0;
- if (i != n-1) header.v[2]->edgeflag = 0;
-
- stage->next->tri( stage->next, &header );
-
- header.v[0]->edgeflag = tmp0;
- header.v[2]->edgeflag = tmp2;
- }
- }
-}
-
-
-#if 0
-static void emit_poly( struct prim_stage *stage )
-{
- GLuint i;
-
- for (i = 2; i < n; i++) {
- header->v[0] = inlist[0];
- header->v[1] = inlist[i-1];
- header->v[2] = inlist[i];
-
- stage->next->tri( stage->next, header );
- }
-}
-#endif
-
-
-/* Clip a triangle against the viewport and user clip planes.
- */
-static void
-do_clip_tri( struct prim_stage *stage,
- struct prim_header *header,
- GLuint clipmask )
-{
- struct clipper *clipper = clipper_stage( stage );
- struct vertex_header *a[MAX_CLIPPED_VERTICES];
- struct vertex_header *b[MAX_CLIPPED_VERTICES];
- struct vertex_header **inlist = a;
- struct vertex_header **outlist = b;
- GLuint tmpnr = 0;
- GLuint n = 3;
- GLuint i;
-
- inlist[0] = header->v[0];
- inlist[1] = header->v[1];
- inlist[2] = header->v[2];
-
- /* XXX: Note stupid hack to deal with tnl's 8-bit clipmask. Remove
- * this once we correctly use 16bit masks for userclip planes.
- */
- clipmask &= ~CLIP_CULL_BIT;
- if (clipmask & CLIP_USER_BIT) {
- clipmask &= ~CLIP_USER_BIT;
- clipmask |= clipper->active_user_planes;
- }
-
- while (clipmask && n >= 3) {
- GLuint plane_idx = ffs(clipmask)-1;
- const GLfloat *plane = clipper->stage.generic->plane[plane_idx];
- struct vertex_header *vert_prev = inlist[0];
- GLfloat dp_prev = dot4( vert_prev->clip, plane );
- GLuint outcount = 0;
-
- clipmask &= ~(1<<plane_idx);
-
- inlist[n] = inlist[0]; /* prevent rotation of vertices */
-
- for (i = 1; i <= n; i++) {
- struct vertex_header *vert = inlist[i];
-
- GLfloat dp = dot4( vert->clip, plane );
-
- if (!IS_NEGATIVE(dp_prev)) {
- outlist[outcount++] = vert_prev;
- }
-
- if (DIFFERENT_SIGNS(dp, dp_prev)) {
- struct vertex_header *new_vert = clipper->stage.tmp[tmpnr++];
- outlist[outcount++] = new_vert;
-
- if (IS_NEGATIVE(dp)) {
- /* Going out of bounds. Avoid division by zero as we
- * know dp != dp_prev from DIFFERENT_SIGNS, above.
- */
- GLfloat t = dp / (dp - dp_prev);
- interp( clipper, new_vert, t, vert, vert_prev );
-
- /* Force edgeflag true in this case:
- */
- new_vert->edgeflag = 1;
- } else {
- /* Coming back in.
- */
- GLfloat t = dp_prev / (dp_prev - dp);
- interp( clipper, new_vert, t, vert_prev, vert );
-
- /* Copy starting vert's edgeflag:
- */
- new_vert->edgeflag = vert_prev->edgeflag;
- }
- }
-
- vert_prev = vert;
- dp_prev = dp;
- }
-
- {
- struct vertex_header **tmp = inlist;
- inlist = outlist;
- outlist = tmp;
- n = outcount;
- }
- }
-
- /* Emit the polygon as triangles to the setup stage:
- */
- if (n >= 3)
- emit_poly( stage, inlist, n );
-}
-
-
-/* Clip a line against the viewport and user clip planes.
- */
-static void
-do_clip_line( struct prim_stage *stage,
- struct prim_header *header,
- GLuint clipmask )
-{
- struct clipper *clipper = clipper_stage( stage );
- struct vertex_header *v0 = header->v[0];
- struct vertex_header *v1 = header->v[1];
- const GLfloat *pos0 = v0->clip;
- const GLfloat *pos1 = v1->clip;
- GLfloat t0 = 0;
- GLfloat t1 = 0;
-
- /* XXX: Note stupid hack to deal with tnl's 8-bit clipmask. Remove
- * this once we correctly use 16bit masks for userclip planes.
- */
- clipmask &= ~CLIP_CULL_BIT;
- if (clipmask & CLIP_USER_BIT) {
- clipmask &= ~CLIP_USER_BIT;
- clipmask |= clipper->active_user_planes;
- }
-
- while (clipmask) {
- GLuint plane_idx = ffs(clipmask)-1;
- const GLfloat *plane = clipper->stage.generic->plane[plane_idx];
-
- clipmask &= ~(1<<plane_idx);
-
- const GLfloat dp0 = dot4( pos0, plane );
- const GLfloat dp1 = dot4( pos1, plane );
-
- if (dp1 < 0) {
- GLfloat t = dp1 / (dp1 - dp0);
- if (t > t1) t1 = t;
- }
-
- if (dp0 < 0) {
- GLfloat t = dp0 / (dp0 - dp1);
- if (t > t0) t0 = t;
- }
-
- if (t0 + t1 >= 1.0)
- return; /* discard */
- }
-
- if (v0->clipmask) {
- interp( clipper, stage->tmp[0], t0, v0, v1 );
- header->v[0] = stage->tmp[0];
- }
-
- if (v1->clipmask) {
- interp( clipper, stage->tmp[1], t1, v1, v0 );
- header->v[1] = stage->tmp[1];
- }
-
- stage->next->line( stage->next, header );
-}
-
-
-
-static void clip_begin( struct prim_stage *stage )
-{
- struct clipper *clipper = clipper_stage(stage);
- GLuint nr = stage->generic->nr_planes;
-
- /* Hacky bitmask to use when we hit CLIP_USER_BIT:
- */
- clipper->active_user_planes = ((1<<nr)-1) & ~((1<<6)-1);
-
- stage->next->begin( stage->next );
-}
-
-static void
-clip_point( struct prim_stage *stage,
- struct prim_header *header )
-{
- if (header->v[0]->clipmask == 0)
- stage->next->point( stage->next, header );
-}
-
-
-static void
-clip_line( struct prim_stage *stage,
- struct prim_header *header )
-{
- GLuint clipmask = (header->v[0]->clipmask |
- header->v[1]->clipmask);
-
- if (clipmask == 0) {
- stage->next->line( stage->next, header );
- }
- else if ((header->v[0]->clipmask &
- header->v[1]->clipmask) == 0) {
- do_clip_line(stage, header, clipmask);
- }
-}
-
-
-static void
-clip_tri( struct prim_stage *stage,
- struct prim_header *header )
-{
- GLuint clipmask = (header->v[0]->clipmask |
- header->v[1]->clipmask |
- header->v[2]->clipmask);
-
- if (clipmask == 0) {
- stage->next->tri( stage->next, header );
- }
- else if ((header->v[0]->clipmask &
- header->v[1]->clipmask &
- header->v[2]->clipmask) == 0) {
- do_clip_tri(stage, header, clipmask);
- }
-}
-
-static void clip_end( struct prim_stage *stage )
-{
- stage->next->end( stage->next );
-}
-
-
-struct prim_stage *prim_clip( struct generic_context *generic )
-{
- struct clipper *clipper = CALLOC_STRUCT(clipper);
-
- prim_alloc_tmps( &clipper->stage, MAX_CLIPPED_VERTICES );
-
- clipper->stage.generic = generic;
- clipper->stage.begin = clip_begin;
- clipper->stage.point = clip_point;
- clipper->stage.line = clip_line;
- clipper->stage.tri = clip_tri;
- clipper->stage.end = clip_end;
-
- return &clipper->stage;
-}
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