src/mesa/tnl/t_vb_light.c

   1
   2 /*
   3  * Mesa 3-D graphics library
   4  * Version:  5.1
   5  *
   6  * Copyright (C) 1999-2003  Brian Paul   All Rights Reserved.
   7  *
   8  * Permission is hereby granted, free of charge, to any person obtaining a
   9  * copy of this software and associated documentation files (the "Software"),
  10  * to deal in the Software without restriction, including without limitation
  11  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  12  * and/or sell copies of the Software, and to permit persons to whom the
  13  * Software is furnished to do so, subject to the following conditions:
  14  *
  15  * The above copyright notice and this permission notice shall be included
  16  * in all copies or substantial portions of the Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  19  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  20  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  21  * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  22  * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  23  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  24  */
  25
  26
  27
  28 #include "glheader.h"
  29 #include "colormac.h"
  30 #include "light.h"
  31 #include "macros.h"
  32 #include "imports.h"
  33 #include "simple_list.h"
  34 #include "mtypes.h"
  35
  36 #include "math/m_translate.h"
  37
  38 #include "t_context.h"
  39 #include "t_pipeline.h"
  40
  41 #define LIGHT_TWOSIDE       0x1
  42 #define LIGHT_MATERIAL      0x2
  43 #define MAX_LIGHT_FUNC      0x4
  44
  45 typedef void (*light_func)( GLcontext *ctx,
  46                             struct vertex_buffer *VB,
  47                             struct tnl_pipeline_stage *stage,
  48                             GLvector4f *input );
  49
  50 struct material_cursor {
  51    const GLfloat *ptr;
  52    GLuint stride;
  53    GLfloat *current;
  54 };
  55
  56 struct light_stage_data {
  57    GLvector4f Input;
  58    GLvector4f LitColor[2];
  59    GLvector4f LitSecondary[2];
  60    GLvector4f LitIndex[2];
  61    light_func *light_func_tab;
  62
  63    struct material_cursor mat[MAT_ATTRIB_MAX];
  64    GLuint mat_count;
  65    GLuint mat_bitmask;
  66 };
  67
  68
  69 #define LIGHT_STAGE_DATA(stage) ((struct light_stage_data *)(stage->privatePtr))
  70
  71
  72
  73 /* In the case of colormaterial, the effected material attributes
  74  * should already have been bound to point to the incoming color data,
  75  * prior to running the pipeline.
  76  */
  77 static void update_materials( GLcontext *ctx,
  78                               struct light_stage_data *store )
  79 {
  80    GLuint i;
  81
  82    for (i = 0 ; i < store->mat_count ; i++) {
  83       COPY_4V(store->mat[i].current, store->mat[i].ptr);
  84       STRIDE_F(store->mat[i].ptr, store->mat[i].stride);
  85    }
  86
  87    _mesa_update_material( ctx, store->mat_bitmask );
  88    _mesa_validate_all_lighting_tables( ctx );
  89 }
  90
  91 static GLuint prepare_materials( GLcontext *ctx,
  92                                  struct vertex_buffer *VB,
  93                                  struct light_stage_data *store )
  94 {
  95    GLuint i;
  96
  97    store->mat_count = 0;
  98    store->mat_bitmask = 0;
  99
 100    /* If ColorMaterial enabled, overwrite affected AttrPtr's with
 101     * the color pointer.  This could be done earlier.
 102     */
 103    if (ctx->Light.ColorMaterialEnabled) {
 104       GLuint bitmask = ctx->Light.ColorMaterialBitmask;
 105       for (i = 0 ; i < MAT_ATTRIB_MAX ; i++)
 106          if (bitmask & (1<<i))
 107             VB->AttribPtr[_TNL_ATTRIB_MAT_FRONT_AMBIENT + i] = VB->ColorPtr[0];
 108    }
 109
 110    for (i = _TNL_ATTRIB_MAT_FRONT_AMBIENT ; i < _TNL_ATTRIB_INDEX ; i++) {
 111       if (VB->AttribPtr[i]->stride) {
 112          GLuint j = store->mat_count++;
 113          GLuint attr = i - _TNL_ATTRIB_MAT_FRONT_AMBIENT;
 114          store->mat[j].ptr = VB->AttribPtr[i]->start;
 115          store->mat[j].stride = VB->AttribPtr[i]->stride;
 116          store->mat[j].current = ctx->Light.Material.Attrib[attr];
 117          store->mat_bitmask |= (1<<attr);
 118       }
 119    }
 120
 121
 122    /* FIXME: Is this already done?
 123     */
 124    _mesa_update_material( ctx, ~0 );
 125    _mesa_validate_all_lighting_tables( ctx );
 126
 127    return store->mat_count;
 128 }
 129
 130 /* Tables for all the shading functions.
 131  */
 132 static light_func _tnl_light_tab[MAX_LIGHT_FUNC];
 133 static light_func _tnl_light_fast_tab[MAX_LIGHT_FUNC];
 134 static light_func _tnl_light_fast_single_tab[MAX_LIGHT_FUNC];
 135 static light_func _tnl_light_spec_tab[MAX_LIGHT_FUNC];
 136 static light_func _tnl_light_ci_tab[MAX_LIGHT_FUNC];
 137
 138 #define TAG(x)           x
 139 #define IDX              (0)
 140 #include "t_vb_lighttmp.h"
 141
 142 #define TAG(x)           x##_twoside
 143 #define IDX              (LIGHT_TWOSIDE)
 144 #include "t_vb_lighttmp.h"
 145
 146 #define TAG(x)           x##_material
 147 #define IDX              (LIGHT_MATERIAL)
 148 #include "t_vb_lighttmp.h"
 149
 150 #define TAG(x)           x##_twoside_material
 151 #define IDX              (LIGHT_TWOSIDE|LIGHT_MATERIAL)
 152 #include "t_vb_lighttmp.h"
 153
 154
 155 static void init_lighting( void )
 156 {
 157    static int done;
 158
 159    if (!done) {
 160       init_light_tab();
 161       init_light_tab_twoside();
 162       init_light_tab_material();
 163       init_light_tab_twoside_material();
 164       done = 1;
 165    }
 166 }
 167
 168
 169 static GLboolean run_lighting( GLcontext *ctx,
 170                                struct tnl_pipeline_stage *stage )
 171 {
 172    struct light_stage_data *store = LIGHT_STAGE_DATA(stage);
 173    TNLcontext *tnl = TNL_CONTEXT(ctx);
 174    struct vertex_buffer *VB = &tnl->vb;
 175    GLvector4f *input = ctx->_NeedEyeCoords ? VB->EyePtr : VB->ObjPtr;
 176    GLuint idx;
 177
 178    /* Make sure we can talk about position x,y and z:
 179     */
 180    if (stage->changed_inputs & _TNL_BIT_POS) {
 181       if (input->size <= 2 && input == VB->ObjPtr) {
 182
 183          _math_trans_4f( store->Input.data,
 184                          VB->ObjPtr->data,
 185                          VB->ObjPtr->stride,
 186                          GL_FLOAT,
 187                          VB->ObjPtr->size,
 188                          0,
 189                          VB->Count );
 190
 191          if (input->size <= 2) {
 192             /* Clean z.
 193              */
 194             _mesa_vector4f_clean_elem(&store->Input, VB->Count, 2);
 195          }
 196
 197          if (input->size <= 1) {
 198             /* Clean y.
 199              */
 200             _mesa_vector4f_clean_elem(&store->Input, VB->Count, 1);
 201          }
 202
 203          input = &store->Input;
 204       }
 205    }
 206
 207    idx = 0;
 208
 209    if (prepare_materials( ctx, VB, store ))
 210       idx |= LIGHT_MATERIAL;
 211
 212    if (ctx->Light.Model.TwoSide)
 213       idx |= LIGHT_TWOSIDE;
 214
 215    /* The individual functions know about replaying side-effects
 216     * vs. full re-execution.
 217     */
 218    store->light_func_tab[idx]( ctx, VB, stage, input );
 219
 220    VB->AttribPtr[_TNL_ATTRIB_COLOR0] = VB->ColorPtr[0];
 221    VB->AttribPtr[_TNL_ATTRIB_COLOR1] = VB->SecondaryColorPtr[0];
 222    VB->AttribPtr[_TNL_ATTRIB_INDEX] = VB->IndexPtr[0];
 223
 224    return GL_TRUE;
 225 }
 226
 227
 228 /* Called in place of do_lighting when the light table may have changed.
 229  */
 230 static GLboolean run_validate_lighting( GLcontext *ctx,
 231                                         struct tnl_pipeline_stage *stage )
 232 {
 233    light_func *tab;
 234
 235    if (ctx->Visual.rgbMode) {
 236       if (ctx->Light._NeedVertices) {
 237          if (ctx->Light.Model.ColorControl == GL_SEPARATE_SPECULAR_COLOR)
 238             tab = _tnl_light_spec_tab;
 239          else
 240             tab = _tnl_light_tab;
 241       }
 242       else {
 243          if (ctx->Light.EnabledList.next == ctx->Light.EnabledList.prev)
 244             tab = _tnl_light_fast_single_tab;
 245          else
 246             tab = _tnl_light_fast_tab;
 247       }
 248    }
 249    else
 250       tab = _tnl_light_ci_tab;
 251
 252
 253    LIGHT_STAGE_DATA(stage)->light_func_tab = tab;
 254
 255    /* This and the above should only be done on _NEW_LIGHT:
 256     */
 257    TNL_CONTEXT(ctx)->Driver.NotifyMaterialChange( ctx );
 258
 259    /* Now run the stage...
 260     */
 261    stage->run = run_lighting;
 262    return stage->run( ctx, stage );
 263 }
 264
 265
 266
 267 /* Called the first time stage->run is called.  In effect, don't
 268  * allocate data until the first time the stage is run.
 269  */
 270 static GLboolean run_init_lighting( GLcontext *ctx,
 271                                     struct tnl_pipeline_stage *stage )
 272 {
 273    TNLcontext *tnl = TNL_CONTEXT(ctx);
 274    struct light_stage_data *store;
 275    GLuint size = tnl->vb.Size;
 276
 277    stage->privatePtr = MALLOC(sizeof(*store));
 278    store = LIGHT_STAGE_DATA(stage);
 279    if (!store)
 280       return GL_FALSE;
 281
 282    /* Do onetime init.
 283     */
 284    init_lighting();
 285
 286    _mesa_vector4f_alloc( &store->Input, 0, size, 32 );
 287    _mesa_vector4f_alloc( &store->LitColor[0], 0, size, 32 );
 288    _mesa_vector4f_alloc( &store->LitColor[1], 0, size, 32 );
 289    _mesa_vector4f_alloc( &store->LitSecondary[0], 0, size, 32 );
 290    _mesa_vector4f_alloc( &store->LitSecondary[1], 0, size, 32 );
 291    _mesa_vector4f_alloc( &store->LitIndex[0], 0, size, 32 );
 292    _mesa_vector4f_alloc( &store->LitIndex[1], 0, size, 32 );
 293
 294    store->LitIndex[0].size = 1;
 295    store->LitIndex[0].stride = sizeof(GLfloat);
 296    store->LitIndex[1].size = 1;
 297    store->LitIndex[1].stride = sizeof(GLfloat);
 298
 299    /* Now validate the stage derived data...
 300     */
 301    stage->run = run_validate_lighting;
 302    return stage->run( ctx, stage );
 303 }
 304
 305
 306
 307 /*
 308  * Check if lighting is enabled.  If so, configure the pipeline stage's
 309  * type, inputs, and outputs.
 310  */
 311 static void check_lighting( GLcontext *ctx, struct tnl_pipeline_stage *stage )
 312 {
 313    stage->active = ctx->Light.Enabled && !ctx->VertexProgram.Enabled;
 314    if (stage->active) {
 315       if (stage->privatePtr)
 316          stage->run = run_validate_lighting;
 317       stage->inputs = _TNL_BIT_NORMAL|_TNL_BITS_MAT_ANY;
 318       if (ctx->Light._NeedVertices)
 319          stage->inputs |= _TNL_BIT_POS;
 320       if (ctx->Light.ColorMaterialEnabled)
 321          stage->inputs |= _TNL_BIT_COLOR0;
 322
 323       stage->outputs = _TNL_BIT_COLOR0;
 324       if (ctx->Light.Model.ColorControl == GL_SEPARATE_SPECULAR_COLOR)
 325          stage->outputs |= _TNL_BIT_COLOR1;
 326    }
 327 }
 328
 329
 330 static void dtr( struct tnl_pipeline_stage *stage )
 331 {
 332    struct light_stage_data *store = LIGHT_STAGE_DATA(stage);
 333
 334    if (store) {
 335       _mesa_vector4f_free( &store->Input );
 336       _mesa_vector4f_free( &store->LitColor[0] );
 337       _mesa_vector4f_free( &store->LitColor[1] );
 338       _mesa_vector4f_free( &store->LitSecondary[0] );
 339       _mesa_vector4f_free( &store->LitSecondary[1] );
 340       _mesa_vector4f_free( &store->LitIndex[0] );
 341       _mesa_vector4f_free( &store->LitIndex[1] );
 342       FREE( store );
 343       stage->privatePtr = 0;
 344    }
 345 }
 346
 347 const struct tnl_pipeline_stage _tnl_lighting_stage =
 348 {
 349    "lighting",                  /* name */
 350    _NEW_LIGHT,                  /* recheck */
 351    _NEW_LIGHT|_NEW_MODELVIEW,   /* recalc -- modelview dependency
 352                                  * otherwise not captured by inputs
 353                                  * (which may be _TNL_BIT_POS) */
 354    GL_FALSE,                    /* active? */
 355    0,                           /* inputs */
 356    0,                           /* outputs */
 357    0,                           /* changed_inputs */
 358    NULL,                        /* private_data */
 359    dtr,                         /* destroy */
 360    check_lighting,              /* check */
 361    run_init_lighting            /* run -- initially set to ctr */
 362 };