src/mesa/tnl/t_vb_normals.c

   1 /* $Id: t_vb_normals.c,v 1.8 2001/03/30 14:44:44 gareth Exp $ */
   2
   3 /*
   4  * Mesa 3-D graphics library
   5  * Version:  3.5
   6  *
   7  * Copyright (C) 1999-2001  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 <keithw@valinux.com>
  28  */
  29
  30
  31 #include "glheader.h"
  32 #include "colormac.h"
  33 #include "context.h"
  34 #include "macros.h"
  35 #include "mem.h"
  36 #include "mmath.h"
  37 #include "mtypes.h"
  38
  39 #include "math/m_xform.h"
  40
  41 #include "t_context.h"
  42 #include "t_pipeline.h"
  43
  44
  45
  46 struct normal_stage_data {
  47    normal_func NormalTransform;
  48    GLvector3f normal;
  49 };
  50
  51 #define NORMAL_STAGE_DATA(stage) ((struct normal_stage_data *)stage->privatePtr)
  52
  53
  54
  55
  56 static GLboolean run_normal_stage( GLcontext *ctx,
  57                                    struct gl_pipeline_stage *stage )
  58 {
  59    struct normal_stage_data *store = NORMAL_STAGE_DATA(stage);
  60    struct vertex_buffer *VB = &TNL_CONTEXT(ctx)->vb;
  61
  62    ASSERT(store->NormalTransform);
  63
  64    if (stage->changed_inputs)
  65       store->NormalTransform( &ctx->ModelView,
  66                               ctx->_ModelViewInvScale,
  67                               VB->NormalPtr,
  68                               0,
  69                               &store->normal );
  70
  71    VB->NormalPtr = &store->normal;
  72    return GL_TRUE;
  73 }
  74
  75
  76 static GLboolean run_validate_normal_stage( GLcontext *ctx,
  77                                             struct gl_pipeline_stage *stage )
  78 {
  79    struct normal_stage_data *store = NORMAL_STAGE_DATA(stage);
  80
  81    ASSERT(ctx->_NeedNormals);
  82
  83    if (ctx->_NeedEyeCoords) {
  84       GLuint transform = NORM_TRANSFORM_NO_ROT;
  85
  86       if (ctx->ModelView.flags & (MAT_FLAG_GENERAL |
  87                                   MAT_FLAG_ROTATION |
  88                                   MAT_FLAG_GENERAL_3D |
  89                                   MAT_FLAG_PERSPECTIVE))
  90          transform = NORM_TRANSFORM;
  91
  92
  93       if (ctx->Transform.Normalize) {
  94          store->NormalTransform = _mesa_normal_tab[transform | NORM_NORMALIZE];
  95       }
  96       else if (ctx->Transform.RescaleNormals &&
  97                ctx->_ModelViewInvScale != 1.0) {
  98          store->NormalTransform = _mesa_normal_tab[transform | NORM_RESCALE];
  99       }
 100       else {
 101          store->NormalTransform = _mesa_normal_tab[transform];
 102       }
 103    }
 104    else {
 105       if (ctx->Transform.Normalize) {
 106          store->NormalTransform = _mesa_normal_tab[NORM_NORMALIZE];
 107       }
 108       else if (!ctx->Transform.RescaleNormals &&
 109                ctx->_ModelViewInvScale != 1.0) {
 110          store->NormalTransform = _mesa_normal_tab[NORM_RESCALE];
 111       }
 112       else {
 113          store->NormalTransform = 0;
 114       }
 115    }
 116
 117    if (store->NormalTransform) {
 118       stage->run = run_normal_stage;
 119       return stage->run( ctx, stage );
 120    } else {
 121       stage->active = GL_FALSE; /* !!! */
 122       return GL_TRUE;
 123    }
 124 }
 125
 126
 127 static void check_normal_transform( GLcontext *ctx,
 128                                     struct gl_pipeline_stage *stage )
 129 {
 130    stage->active = ctx->_NeedNormals;
 131    /* Don't clobber the initialize function:
 132     */
 133    if (stage->privatePtr)
 134       stage->run = run_validate_normal_stage;
 135 }
 136
 137
 138 static GLboolean alloc_normal_data( GLcontext *ctx,
 139                                  struct gl_pipeline_stage *stage )
 140 {
 141    TNLcontext *tnl = TNL_CONTEXT(ctx);
 142    struct normal_stage_data *store;
 143    stage->privatePtr = MALLOC(sizeof(*store));
 144    store = NORMAL_STAGE_DATA(stage);
 145    if (!store)
 146       return GL_FALSE;
 147
 148    _mesa_vector3f_alloc( &store->normal, 0, tnl->vb.Size, 32 );
 149
 150    /* Now run the stage.
 151     */
 152    stage->run = run_validate_normal_stage;
 153    return stage->run( ctx, stage );
 154 }
 155
 156
 157
 158 static void free_normal_data( struct gl_pipeline_stage *stage )
 159 {
 160    struct normal_stage_data *store = NORMAL_STAGE_DATA(stage);
 161    if (store) {
 162       _mesa_vector3f_free( &store->normal );
 163       FREE( store );
 164       stage->privatePtr = NULL;
 165    }
 166 }
 167
 168 #define _TNL_NEW_NORMAL_TRANSFORM        (_NEW_MODELVIEW| \
 169                                           _NEW_TRANSFORM| \
 170                                           _MESA_NEW_NEED_NORMALS| \
 171                                           _MESA_NEW_NEED_EYE_COORDS)
 172
 173
 174
 175 const struct gl_pipeline_stage _tnl_normal_transform_stage =
 176 {
 177    "normal transform",
 178    _TNL_NEW_NORMAL_TRANSFORM,   /* re-check */
 179    _TNL_NEW_NORMAL_TRANSFORM,   /* re-run */
 180    0,VERT_NORM,VERT_NORM,       /* active, inputs, outputs */
 181    0, 0,                        /* changed_inputs, private */
 182    free_normal_data,            /* destructor */
 183    check_normal_transform,      /* check */
 184    alloc_normal_data            /* run -- initially set to alloc */
 185 };