src/mesa/tnl/t_eval_api.c

   1 /* $Id: t_eval_api.c,v 1.13 2003/03/01 01:50:26 brianp Exp $ */
   2
   3 /*
   4  * Mesa 3-D graphics library
   5  * Version:  5.1
   6  *
   7  * Copyright (C) 1999-2003  Brian Paul   All Rights Reserved.
   8  *
   9  * Permission is hereby granted, free of charge, to any person obtaining a
  10  * copy of this software and associated documentation files (the "Software"),
  11  * to deal in the Software without restriction, including without limitation
  12  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  13  * and/or sell copies of the Software, and to permit persons to whom the
  14  * Software is furnished to do so, subject to the following conditions:
  15  *
  16  * The above copyright notice and this permission notice shall be included
  17  * in all copies or substantial portions of the Software.
  18  *
  19  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  20  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  21  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  22  * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  23  * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  24  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25  *
  26  * Authors:
  27  *    Keith Whitwell - original code
  28  *    Brian Paul - vertex program updates
  29  */
  30
  31
  32 #include "glheader.h"
  33 #include "colormac.h"
  34 #include "context.h"
  35 #include "macros.h"
  36 #include "imports.h"
  37 #include "mtypes.h"
  38 #include "math/m_eval.h"
  39
  40 #include "t_eval_api.h"
  41 #include "t_imm_api.h"
  42 #include "t_imm_alloc.h"
  43 #include "t_imm_exec.h"
  44
  45
  46 /* KW: If are compiling, we don't know whether eval will produce a
  47  *     vertex when it is run in the future.  If this is pure immediate
  48  *     mode, eval is a noop if neither vertex map is enabled.
  49  *
  50  *     Thus we need to have a check in the display list code or
  51  *     elsewhere for eval(1,2) vertices in the case where
  52  *     map(1,2)_vertex is disabled, and to purge those vertices from
  53  *     the vb.
  54  */
  55 void
  56 _tnl_exec_EvalMesh1( GLenum mode, GLint i1, GLint i2 )
  57 {
  58    GET_CURRENT_CONTEXT(ctx);
  59    GLint i;
  60    GLfloat u, du;
  61    GLenum prim;
  62    ASSERT_OUTSIDE_BEGIN_END(ctx);
  63
  64    if (MESA_VERBOSE & VERBOSE_API)
  65       _mesa_debug(ctx, "glEvalMesh1()");
  66
  67    switch (mode) {
  68       case GL_POINT:
  69          prim = GL_POINTS;
  70          break;
  71       case GL_LINE:
  72          prim = GL_LINE_STRIP;
  73          break;
  74       default:
  75          _mesa_error( ctx, GL_INVALID_ENUM, "glEvalMesh1(mode)" );
  76          return;
  77    }
  78
  79    /* No effect if vertex maps disabled.
  80     */
  81    if (!ctx->Eval.Map1Vertex4 && !ctx->Eval.Map1Vertex3 &&
  82        (!ctx->VertexProgram.Enabled || !ctx->Eval.Map1Attrib[VERT_ATTRIB_POS]))
  83       return;
  84
  85    du = ctx->Eval.MapGrid1du;
  86    u = ctx->Eval.MapGrid1u1 + i1 * du;
  87
  88    /* Need to turn off compilation -- this is already saved, and the
  89     * coordinates generated and the test above depend on state that
  90     * may change before the list is executed.
  91     *
  92     * TODO: Anaylse display lists to determine if this state is
  93     * constant.
  94     *
  95     * State to watch:
  96     *       - enabled maps
  97     *       - map state for each enabled map, including control points
  98     *       - grid state
  99     *
 100     * Could alternatively cache individual maps in arrays, rather than
 101     * building immediates.
 102     */
 103    {
 104       GLboolean compiling = ctx->CompileFlag;
 105       TNLcontext *tnl = TNL_CONTEXT(ctx);
 106       struct immediate *im = TNL_CURRENT_IM(ctx);
 107       GLboolean (*NotifyBegin)(GLcontext *ctx, GLenum p);
 108
 109       NotifyBegin = tnl->Driver.NotifyBegin;
 110       tnl->Driver.NotifyBegin = 0;
 111
 112       if (compiling) {
 113          struct immediate *tmp = _tnl_alloc_immediate( ctx );
 114          FLUSH_VERTICES( ctx, 0 );
 115          SET_IMMEDIATE( ctx, tmp );
 116          TNL_CURRENT_IM(ctx)->ref_count++;
 117          ctx->CompileFlag = GL_FALSE;
 118       }
 119
 120       _tnl_Begin( prim );
 121       for (i=i1;i<=i2;i++,u+=du) {
 122          _tnl_eval_coord1f( ctx, u );
 123       }
 124       _tnl_end(ctx);
 125
 126       /* Need this for replay *and* compile:
 127        */
 128       FLUSH_VERTICES( ctx, 0 );
 129       tnl->Driver.NotifyBegin = NotifyBegin;
 130
 131       if (compiling) {
 132          TNL_CURRENT_IM(ctx)->ref_count--;
 133          ASSERT( TNL_CURRENT_IM(ctx)->ref_count == 0 );
 134          _tnl_free_immediate( ctx, TNL_CURRENT_IM(ctx) );
 135          SET_IMMEDIATE( ctx, im );
 136          ctx->CompileFlag = GL_TRUE;
 137       }
 138    }
 139 }
 140
 141
 142
 143 void
 144 _tnl_exec_EvalMesh2( GLenum mode, GLint i1, GLint i2, GLint j1, GLint j2 )
 145 {
 146    GET_CURRENT_CONTEXT(ctx);
 147    GLint i, j;
 148    GLfloat u, du, v, dv, v1, u1;
 149    ASSERT_OUTSIDE_BEGIN_END(ctx);
 150
 151    if (MESA_VERBOSE & VERBOSE_API)
 152       _mesa_debug(ctx, "glEvalMesh2()");
 153
 154    /* No effect if vertex maps disabled.
 155     */
 156    if (!ctx->Eval.Map2Vertex4 && !ctx->Eval.Map2Vertex3 &&
 157        (!ctx->VertexProgram.Enabled || !ctx->Eval.Map2Attrib[VERT_ATTRIB_POS]))
 158       return;
 159
 160    du = ctx->Eval.MapGrid2du;
 161    dv = ctx->Eval.MapGrid2dv;
 162    v1 = ctx->Eval.MapGrid2v1 + j1 * dv;
 163    u1 = ctx->Eval.MapGrid2u1 + i1 * du;
 164
 165    /* Need to turn off compilation -- this is already saved, and the
 166     * coordinates generated and the test above depend on state that
 167     * may change before the list is executed.
 168     */
 169    {
 170       GLboolean compiling = ctx->CompileFlag;
 171       struct immediate *im = TNL_CURRENT_IM(ctx);
 172       TNLcontext *tnl = TNL_CONTEXT(ctx);
 173       GLboolean (*NotifyBegin)(GLcontext *ctx, GLenum p);
 174
 175       NotifyBegin = tnl->Driver.NotifyBegin;
 176       tnl->Driver.NotifyBegin = 0;
 177
 178       if (compiling) {
 179          struct immediate *tmp = _tnl_alloc_immediate( ctx );
 180          FLUSH_VERTICES( ctx, 0 );
 181          SET_IMMEDIATE( ctx, tmp );
 182          TNL_CURRENT_IM(ctx)->ref_count++;
 183          ctx->CompileFlag = GL_FALSE;
 184       }
 185
 186       switch (mode) {
 187       case GL_POINT:
 188          _tnl_Begin( GL_POINTS );
 189          for (v=v1,j=j1;j<=j2;j++,v+=dv) {
 190             for (u=u1,i=i1;i<=i2;i++,u+=du) {
 191                _tnl_eval_coord2f( ctx, u, v );
 192             }
 193          }
 194          _tnl_end(ctx);
 195          break;
 196       case GL_LINE:
 197          for (v=v1,j=j1;j<=j2;j++,v+=dv) {
 198             _tnl_Begin( GL_LINE_STRIP );
 199             for (u=u1,i=i1;i<=i2;i++,u+=du) {
 200                _tnl_eval_coord2f( ctx, u, v );
 201             }
 202             _tnl_end(ctx);
 203          }
 204          for (u=u1,i=i1;i<=i2;i++,u+=du) {
 205             _tnl_Begin( GL_LINE_STRIP );
 206             for (v=v1,j=j1;j<=j2;j++,v+=dv) {
 207                _tnl_eval_coord2f( ctx, u, v );
 208             }
 209             _tnl_end(ctx);
 210          }
 211          break;
 212       case GL_FILL:
 213          for (v=v1,j=j1;j<j2;j++,v+=dv) {
 214             _tnl_Begin( GL_TRIANGLE_STRIP );
 215             for (u=u1,i=i1;i<=i2;i++,u+=du) {
 216                _tnl_eval_coord2f( ctx, u, v );
 217                _tnl_eval_coord2f( ctx, u, v+dv );
 218             }
 219             _tnl_end(ctx);
 220          }
 221          break;
 222       default:
 223          _mesa_error( ctx, GL_INVALID_ENUM, "glEvalMesh2(mode)" );
 224          return;
 225       }
 226
 227       /* Need this for replay *and* compile:
 228        */
 229       FLUSH_VERTICES( ctx, 0 );
 230       tnl->Driver.NotifyBegin = NotifyBegin;
 231
 232       if (compiling) {
 233          TNL_CURRENT_IM(ctx)->ref_count--;
 234          _tnl_free_immediate( ctx, TNL_CURRENT_IM( ctx ) );
 235          SET_IMMEDIATE( ctx, im );
 236          ctx->CompileFlag = GL_TRUE;
 237       }
 238    }
 239 }
 240
 241
 242 void _tnl_eval_init( GLcontext *ctx )
 243 {
 244    GLvertexformat *vfmt = &(TNL_CONTEXT(ctx)->vtxfmt);
 245    vfmt->EvalMesh1 = _tnl_exec_EvalMesh1;
 246    vfmt->EvalMesh2 = _tnl_exec_EvalMesh2;
 247 }