src/mesa/tnl/t_vb_normals.c

   1 /* $Id: t_vb_normals.c,v 1.6 2001/03/07 05:06:13 brianp Exp $ */
   2
   3 /*
   4  * Mesa 3-D graphics library
   5  * Version:  3.5
   6  *
   7  * Copyright (C) 1999-2000  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  * Author:
  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[0])(&ctx->ModelView,
  66                                   ctx->_ModelViewInvScale,
  67                                   VB->NormalPtr,
  68                                   0,
  69                                   0,
  70                                   &store->normal);
  71
  72    VB->NormalPtr = &store->normal;
  73    return GL_TRUE;
  74 }
  75
  76
  77 static GLboolean run_validate_normal_stage( GLcontext *ctx,
  78                                                 struct gl_pipeline_stage *stage)
  79 {
  80    struct normal_stage_data *store = NORMAL_STAGE_DATA(stage);
  81
  82    ASSERT(ctx->_NeedNormals);
  83
  84    if (ctx->_NeedEyeCoords) {
  85       GLuint transform = NORM_TRANSFORM_NO_ROT;
  86
  87       if (ctx->ModelView.flags & (MAT_FLAG_GENERAL |
  88                                   MAT_FLAG_ROTATION |
  89                                   MAT_FLAG_GENERAL_3D |
  90                                   MAT_FLAG_PERSPECTIVE))
  91          transform = NORM_TRANSFORM;
  92
  93
  94       if (ctx->Transform.Normalize) {
  95          store->NormalTransform = _mesa_normal_tab[transform | NORM_NORMALIZE];
  96       }
  97       else if (ctx->Transform.RescaleNormals &&
  98                ctx->_ModelViewInvScale != 1.0) {
  99          store->NormalTransform = _mesa_normal_tab[transform | NORM_RESCALE];
 100       }
 101       else {
 102          store->NormalTransform = _mesa_normal_tab[transform];
 103       }
 104    }
 105    else {
 106       if (ctx->Transform.Normalize) {
 107          store->NormalTransform = _mesa_normal_tab[NORM_NORMALIZE];
 108       }
 109       else if (!ctx->Transform.RescaleNormals &&
 110                ctx->_ModelViewInvScale != 1.0) {
 111          store->NormalTransform = _mesa_normal_tab[NORM_RESCALE];
 112       }
 113       else {
 114          store->NormalTransform = 0;
 115       }
 116    }
 117
 118    if (store->NormalTransform) {
 119       stage->run = run_normal_stage;
 120       return stage->run( ctx, stage );
 121    } else {
 122       stage->active = GL_FALSE; /* !!! */
 123       return GL_TRUE;
 124    }
 125 }
 126
 127
 128 static void check_normal_transform( GLcontext *ctx,
 129                                     struct gl_pipeline_stage *stage )
 130 {
 131    stage->active = ctx->_NeedNormals;
 132    /* Don't clobber the initialize function:
 133     */
 134    if (stage->privatePtr)
 135       stage->run = run_validate_normal_stage;
 136 }
 137
 138
 139 static GLboolean alloc_normal_data( GLcontext *ctx,
 140                                  struct gl_pipeline_stage *stage )
 141 {
 142    TNLcontext *tnl = TNL_CONTEXT(ctx);
 143    struct normal_stage_data *store;
 144    stage->privatePtr = MALLOC(sizeof(*store));
 145    store = NORMAL_STAGE_DATA(stage);
 146    if (!store)
 147       return GL_FALSE;
 148
 149    _mesa_vector3f_alloc( &store->normal, 0, tnl->vb.Size, 32 );
 150
 151    /* Now run the stage.
 152     */
 153    stage->run = run_validate_normal_stage;
 154    return stage->run( ctx, stage );
 155 }
 156
 157
 158
 159 static void free_normal_data( struct gl_pipeline_stage *stage )
 160 {
 161    struct normal_stage_data *store = NORMAL_STAGE_DATA(stage);
 162    if (store) {
 163       _mesa_vector3f_free( &store->normal );
 164       FREE( store );
 165       stage->privatePtr = NULL;
 166    }
 167 }
 168
 169 #define _TNL_NEW_NORMAL_TRANSFORM        (_NEW_MODELVIEW| \
 170                                           _NEW_TRANSFORM| \
 171                                           _MESA_NEW_NEED_NORMALS| \
 172                                           _MESA_NEW_NEED_EYE_COORDS)
 173
 174
 175
 176 const struct gl_pipeline_stage _tnl_normal_transform_stage =
 177 {
 178    "normal transform",
 179    _TNL_NEW_NORMAL_TRANSFORM,   /* re-check */
 180    _TNL_NEW_NORMAL_TRANSFORM,   /* re-run */
 181    0,VERT_NORM,VERT_NORM,       /* active, inputs, outputs */
 182    0, 0,                        /* changed_inputs, private */
 183    free_normal_data,            /* destructor */
 184    check_normal_transform,      /* check */
 185    alloc_normal_data            /* run -- initially set to alloc */
 186 };
 187