source: branches/swt/src/opengl/mesa/3dfx/fxcvatmp.h

/* -*- mode: C; tab-width:8; c-basic-offset:2 -*- */

/*
 * Mesa 3-D graphics library
 * Version:  3.3
 *
 * Copyright (C) 1999  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"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * 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 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 NONINFRINGEMENT.  IN NO EVENT SHALL
 * BRIAN PAUL 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.
 *
 *
 * Original Mesa / 3Dfx device driver (C) 1999 David Bucciarelli, by the
 * terms stated above.
 *
 * Thank you for your contribution, David!
 *
 * Please make note of the above copyright/license statement.  If you
 * contributed code or bug fixes to this code under the previous (GNU
 * Library) license and object to the new license, your code will be
 * removed at your request.  Please see the Mesa docs/COPYRIGHT file
 * for more information.
 *
 * Additional Mesa/3Dfx driver developers:
 *   Daryll Strauss <daryll@precisioninsight.com>
 *   Keith Whitwell <keith@precisioninsight.com>
 *
 * See fxapi.h for more revision/author details.
 */


static void TAG(cva_render_points)( struct vertex_buffer *cvaVB,
                                    struct vertex_buffer *VB,
                                    const struct gl_prim_state *state,
                                    GLuint start,
                                    GLuint count )
{
   GLcontext *ctx = VB->ctx;
   fxMesaContext fxMesa = (fxMesaContext)ctx->DriverCtx;
   fxVertex *gWin = FX_DRIVER_DATA(cvaVB)->verts;
   const GLuint *elt = VB->EltPtr->data;
   GLuint i;

   VARS;
   INIT;
   (void) fxMesa;

   if (cvaVB->ClipOrMask) {
      const GLubyte *clip = cvaVB->ClipMask;
      for (i = start ; i < count ; i++ INCR) {
         GLuint e = elt[i];
         if (!clip[e]) {
            GLfloat *v = gWin[e].f; (void) v;
            if (!DIRECT) { MERGE_VB; }
            MERGE_RAST;
            DRAW_POINT;
         }
      }
   } else {
      for (i = start ; i < count ; i++ INCR) {
         GLuint e = elt[i];
         GLfloat *v = gWin[e].f; (void) v;
         if (!DIRECT) { MERGE_VB; }
         MERGE_RAST;
         DRAW_POINT;
      }
   }
}

static void TAG(cva_render_lines)( struct vertex_buffer *cvaVB,
                                   struct vertex_buffer *VB,
                                   const struct gl_prim_state *state,
                                   GLuint start,
                                   GLuint count )
{
   GLcontext *ctx = VB->ctx;
   fxMesaContext fxMesa = (fxMesaContext)ctx->DriverCtx;
   fxVertex *gWin = FX_DRIVER_DATA(cvaVB)->verts;
   const GLuint *elt = VB->EltPtr->data;
   GLuint i;

   VARS;
   INIT;
   (void) fxMesa;

   if (cvaVB->ClipOrMask) {
      const GLubyte *clip = cvaVB->ClipMask;
      GLuint prev = 0;
      GLfloat *prev_v = 0;

      (void) ctx;

      for (i = start ; i < count ; i++ INCR) {
         GLuint e = elt[i];
         GLfloat *v = gWin[e].f;

         MERGE_VB;

         if (!clip[e])
            MERGE_RAST;

         if (state->draw) {
            if (clip[e] | clip[prev])
               CLIP_LINE;
            else
               DRAW_LINE;
         }

         prev = e;
         prev_v = v;
         state = state->next;
      }
      if (state->finish_loop) {
         GLuint e = elt[start];
         GLfloat *v = gWin[e].f; (void) v;

         if (!DIRECT) { MERGE_VB; }
         MERGE_RAST;

         if (clip[e] | clip[prev])
            CLIP_LINE;
         else
            DRAW_LINE;
      }
   } else {
      GLuint prev = 0;
      GLfloat *prev_v = 0;

      for (i = start ; i < count ; i++ INCR) {
         GLuint e = elt[i];
         GLfloat *v = gWin[e].f;

         if (!DIRECT) { MERGE_VB; }
         MERGE_RAST;
         if (state->draw) DRAW_LINE;
         prev = e;
         prev_v = v;
         state = state->next;
      }
      if (state->finish_loop) {
         GLuint e = elt[start];
         GLfloat *v = gWin[e].f; (void) v;

         if (!DIRECT) { MERGE_VB; }
         MERGE_RAST;
         DRAW_LINE;
      }
   }
}


static void TAG(cva_render_tris)( struct vertex_buffer *cvaVB,
                                  struct vertex_buffer *VB,
                                  const struct gl_prim_state *state,
                                  GLuint start,
                                  GLuint count )
{
   GLcontext *ctx = VB->ctx;
   fxMesaContext fxMesa = (fxMesaContext)ctx->DriverCtx;
   fxVertex *gWin = FX_DRIVER_DATA(cvaVB)->verts;
   const GLuint *elt = VB->EltPtr->data;
   GLuint i;
   VARS;
   INIT;
   (void) fxMesa;

   if (cvaVB->ClipOrMask) {
      GLuint vlist[VB_MAX_CLIPPED_VERTS];
      GLuint l[3];
      const GLubyte *clip = cvaVB->ClipMask;

      (void) vlist;

      for (i = start ; i < count ; i++ INCR) {
         GLuint e = l[2] = elt[i];
         GLfloat *v = gWin[e].f; (void) v;

         MERGE_VB;              /* needed for clip-interp */

         if (!clip[e]) {
            MERGE_RAST;
         }

         if (state->draw)
            CLIP_OR_DRAW_TRI;


         l[0] = l[state->v0];
         l[1] = l[state->v1];
         state = state->next;
      }
   } else if (DIRECT) {
      GrVertex *vl[3];
      for (i = start ; i < count ; i++ INCR) {
         GLuint e = elt[i];
         GLfloat *v = gWin[elt[i]].f;

         vl[2] = (GrVertex *)v;

         (void) v;
         (void) e;

         MERGE_RAST;

         if (state->draw)
            DRAW_TRI2;

         vl[0] = vl[state->v0];
         vl[1] = vl[state->v1];
         state = state->next;
      }
   } else {
      GLuint l[3];
      for (i = start ; i < count ; i++ INCR) {
         GLuint e = l[2] = elt[i];
         GLfloat *v = gWin[e].f; (void) v;

         MERGE_VB;              /* needed for ctx->trianglefunc? */
         MERGE_RAST;

         if (state->draw)
            DRAW_TRI;

         l[0] = l[state->v0];
         l[1] = l[state->v1];
         state = state->next;
      }
   }
}


static void TAG(init_cva)( void )
{
   merge_and_render_tab[DIRECT][IDX][PRIM_POINTS] = TAG(cva_render_points);
   merge_and_render_tab[DIRECT][IDX][PRIM_LINES] = TAG(cva_render_lines);
   merge_and_render_tab[DIRECT][IDX][PRIM_TRIS] = TAG(cva_render_tris);
   merge_and_render_tab[DIRECT][IDX][PRIM_CULLED] = fxCvaRenderNoop;
}


#undef IDX
#undef MERGE_RAST
#undef MERGE_VB
#undef VARS
#undef INIT
#undef INCR
#undef TAG