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-rw-r--r--src/mesa/pipe/draw/draw_clip.c488
1 files changed, 0 insertions, 488 deletions
diff --git a/src/mesa/pipe/draw/draw_clip.c b/src/mesa/pipe/draw/draw_clip.c
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index e3051507eaf..00000000000
--- a/src/mesa/pipe/draw/draw_clip.c
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@@ -1,488 +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.
- *
- **************************************************************************/
-
-/**
- * \brief Clipping stage
- *
- * \author Keith Whitwell <[email protected]>
- */
-
-
-#include "pipe/p_util.h"
-#include "pipe/p_shader_tokens.h"
-
-#include "draw_context.h"
-#include "draw_private.h"
-
-
-#ifndef IS_NEGATIVE
-#define IS_NEGATIVE(X) ((X) < 0.0)
-#endif
-
-#ifndef DIFFERENT_SIGNS
-#define DIFFERENT_SIGNS(x, y) ((x) * (y) <= 0.0F && (x) - (y) != 0.0F)
-#endif
-
-#ifndef MAX_CLIPPED_VERTICES
-#define MAX_CLIPPED_VERTICES ((2 * (6 + PIPE_MAX_CLIP_PLANES))+1)
-#endif
-
-
-
-struct clipper {
- struct draw_stage stage; /**< base class */
-
- /* Basically duplicate some of the flatshading logic here:
- */
- boolean flat;
- uint num_color_attribs;
- uint color_attribs[4]; /* front/back primary/secondary colors */
-
- float (*plane)[4];
-};
-
-
-/* This is a bit confusing:
- */
-static INLINE struct clipper *clipper_stage( struct draw_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( float *fdst,
- float t,
- const float *fin,
- const float *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] );
-}
-
-static void copy_colors( struct draw_stage *stage,
- struct vertex_header *dst,
- const struct vertex_header *src )
-{
- const struct clipper *clipper = clipper_stage(stage);
- uint i;
- for (i = 0; i < clipper->num_color_attribs; i++) {
- const uint attr = clipper->color_attribs[i];
- COPY_4FV(dst->data[attr], src->data[attr]);
- }
-}
-
-
-
-/* Interpolate between two vertices to produce a third.
- */
-static void interp( const struct clipper *clip,
- struct vertex_header *dst,
- float t,
- const struct vertex_header *out,
- const struct vertex_header *in )
-{
- const unsigned nr_attrs = clip->stage.draw->num_vs_outputs;
- unsigned j;
-
- /* Vertex header.
- */
- {
- dst->clipmask = 0;
- dst->edgeflag = 0;
- dst->pad = 0;
- dst->vertex_id = UNDEFINED_VERTEX_ID;
- }
-
- /* Clip coordinates: interpolate normally
- */
- {
- interp_attr(dst->clip, t, in->clip, out->clip);
- }
-
- /* Do the projective divide and insert window coordinates:
- */
- {
- const float *pos = dst->clip;
- const float *scale = clip->stage.draw->viewport.scale;
- const float *trans = clip->stage.draw->viewport.translate;
- const float oow = 1.0f / 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
- * Note: start at 1 to skip winpos (data[0]) since we just computed
- * it above.
- */
- for (j = 1; j < nr_attrs; j++) {
- interp_attr(dst->data[j], t, in->data[j], out->data[j]);
- }
-}
-
-
-static void emit_poly( struct draw_stage *stage,
- struct vertex_header **inlist,
- unsigned n,
- const struct prim_header *origPrim)
-{
- struct prim_header header;
- unsigned i;
-
- /* later stages may need the determinant, but only the sign matters */
- header.det = origPrim->det;
-
- for (i = 2; i < n; i++) {
- header.v[0] = inlist[i-1];
- header.v[1] = inlist[i];
- header.v[2] = inlist[0]; /* keep in v[2] for flatshading */
-
- {
- unsigned tmp1 = header.v[1]->edgeflag;
- unsigned tmp2 = header.v[2]->edgeflag;
-
- if (i != n-1) header.v[1]->edgeflag = 0;
- if (i != 2) header.v[2]->edgeflag = 0;
-
- header.edgeflags = ((header.v[0]->edgeflag << 0) |
- (header.v[1]->edgeflag << 1) |
- (header.v[2]->edgeflag << 2));
-
- stage->next->tri( stage->next, &header );
-
- header.v[1]->edgeflag = tmp1;
- header.v[2]->edgeflag = tmp2;
- }
- }
-}
-
-
-
-
-/* Clip a triangle against the viewport and user clip planes.
- */
-static void
-do_clip_tri( struct draw_stage *stage,
- struct prim_header *header,
- unsigned 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;
- unsigned tmpnr = 0;
- unsigned n = 3;
- unsigned i;
-
- inlist[0] = header->v[0];
- inlist[1] = header->v[1];
- inlist[2] = header->v[2];
-
- while (clipmask && n >= 3) {
- const unsigned plane_idx = ffs(clipmask)-1;
- const float *plane = clipper->plane[plane_idx];
- struct vertex_header *vert_prev = inlist[0];
- float dp_prev = dot4( vert_prev->clip, plane );
- unsigned 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];
-
- float 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.
- */
- float 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.
- */
- float 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;
- }
- }
-
- /* If flat-shading, copy color to new provoking vertex.
- */
- if (clipper->flat && inlist[0] != header->v[2]) {
- if (1) {
- inlist[0] = dup_vert(stage, inlist[0], tmpnr++);
- }
-
- copy_colors(stage, inlist[0], header->v[2]);
- }
-
-
-
- /* Emit the polygon as triangles to the setup stage:
- */
- if (n >= 3)
- emit_poly( stage, inlist, n, header );
-}
-
-
-/* Clip a line against the viewport and user clip planes.
- */
-static void
-do_clip_line( struct draw_stage *stage,
- struct prim_header *header,
- unsigned clipmask )
-{
- const struct clipper *clipper = clipper_stage( stage );
- struct vertex_header *v0 = header->v[0];
- struct vertex_header *v1 = header->v[1];
- const float *pos0 = v0->clip;
- const float *pos1 = v1->clip;
- float t0 = 0.0F;
- float t1 = 0.0F;
- struct prim_header newprim;
-
- while (clipmask) {
- const unsigned plane_idx = ffs(clipmask)-1;
- const float *plane = clipper->plane[plane_idx];
- const float dp0 = dot4( pos0, plane );
- const float dp1 = dot4( pos1, plane );
-
- if (dp1 < 0.0F) {
- float t = dp1 / (dp1 - dp0);
- t1 = MAX2(t1, t);
- }
-
- if (dp0 < 0.0F) {
- float t = dp0 / (dp0 - dp1);
- t0 = MAX2(t0, t);
- }
-
- if (t0 + t1 >= 1.0F)
- return; /* discard */
-
- clipmask &= ~(1 << plane_idx); /* turn off this plane's bit */
- }
-
- if (v0->clipmask) {
- interp( clipper, stage->tmp[0], t0, v0, v1 );
-
- if (clipper->flat)
- copy_colors(stage, stage->tmp[0], v0);
-
- newprim.v[0] = stage->tmp[0];
- }
- else {
- newprim.v[0] = v0;
- }
-
- if (v1->clipmask) {
- interp( clipper, stage->tmp[1], t1, v1, v0 );
- newprim.v[1] = stage->tmp[1];
- }
- else {
- newprim.v[1] = v1;
- }
-
- stage->next->line( stage->next, &newprim );
-}
-
-
-static void
-clip_point( struct draw_stage *stage,
- struct prim_header *header )
-{
- if (header->v[0]->clipmask == 0)
- stage->next->point( stage->next, header );
-}
-
-
-static void
-clip_line( struct draw_stage *stage,
- struct prim_header *header )
-{
- unsigned clipmask = (header->v[0]->clipmask |
- header->v[1]->clipmask);
-
- if (clipmask == 0) {
- /* no clipping needed */
- stage->next->line( stage->next, header );
- }
- else if ((header->v[0]->clipmask &
- header->v[1]->clipmask) == 0) {
- do_clip_line(stage, header, clipmask);
- }
- /* else, totally clipped */
-}
-
-
-static void
-clip_tri( struct draw_stage *stage,
- struct prim_header *header )
-{
- unsigned clipmask = (header->v[0]->clipmask |
- header->v[1]->clipmask |
- header->v[2]->clipmask);
-
- if (clipmask == 0) {
- /* no clipping needed */
- 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);
- }
-}
-
-/* Update state. Could further delay this until we hit the first
- * primitive that really requires clipping.
- */
-static void
-clip_init_state( struct draw_stage *stage )
-{
- struct clipper *clipper = clipper_stage( stage );
-
- clipper->flat = stage->draw->rasterizer->flatshade ? TRUE : FALSE;
-
- if (clipper->flat) {
- const struct pipe_shader_state *vs = stage->draw->vertex_shader->state;
- uint i;
-
- clipper->num_color_attribs = 0;
- for (i = 0; i < vs->num_outputs; i++) {
- if (vs->output_semantic_name[i] == TGSI_SEMANTIC_COLOR ||
- vs->output_semantic_name[i] == TGSI_SEMANTIC_BCOLOR) {
- clipper->color_attribs[clipper->num_color_attribs++] = i;
- }
- }
- }
-
- stage->tri = clip_tri;
- stage->line = clip_line;
-}
-
-
-
-static void clip_first_tri( struct draw_stage *stage,
- struct prim_header *header )
-{
- clip_init_state( stage );
- stage->tri( stage, header );
-}
-
-static void clip_first_line( struct draw_stage *stage,
- struct prim_header *header )
-{
- clip_init_state( stage );
- stage->line( stage, header );
-}
-
-
-static void clip_flush( struct draw_stage *stage,
- unsigned flags )
-{
- stage->tri = clip_first_tri;
- stage->line = clip_first_line;
- stage->next->flush( stage->next, flags );
-}
-
-
-static void clip_reset_stipple_counter( struct draw_stage *stage )
-{
- stage->next->reset_stipple_counter( stage->next );
-}
-
-
-static void clip_destroy( struct draw_stage *stage )
-{
- draw_free_temp_verts( stage );
- FREE( stage );
-}
-
-
-/**
- * Allocate a new clipper stage.
- * \return pointer to new stage object
- */
-struct draw_stage *draw_clip_stage( struct draw_context *draw )
-{
- struct clipper *clipper = CALLOC_STRUCT(clipper);
-
- draw_alloc_temp_verts( &clipper->stage, MAX_CLIPPED_VERTICES+1 );
-
- clipper->stage.draw = draw;
- clipper->stage.point = clip_point;
- clipper->stage.line = clip_first_line;
- clipper->stage.tri = clip_first_tri;
- clipper->stage.flush = clip_flush;
- clipper->stage.reset_stipple_counter = clip_reset_stipple_counter;
- clipper->stage.destroy = clip_destroy;
-
- clipper->plane = draw->plane;
-
- return &clipper->stage;
-}
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