src/mesa/tnl/t_vb_light.c

   1 /*
   2  * Mesa 3-D graphics library
   3  * Version:  6.5
   4  *
   5  * Copyright (C) 1999-2006  Brian Paul   All Rights Reserved.
   6  *
   7  * Permission is hereby granted, free of charge, to any person obtaining a
   8  * copy of this software and associated documentation files (the "Software"),
   9  * to deal in the Software without restriction, including without limitation
  10  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  11  * and/or sell copies of the Software, and to permit persons to whom the
  12  * Software is furnished to do so, subject to the following conditions:
  13  *
  14  * The above copyright notice and this permission notice shall be included
  15  * in all copies or substantial portions of the Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  18  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  20  * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  21  * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  22  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  23  */
  24
  25
  26
  27 #include "glheader.h"
  28 #include "colormac.h"
  29 #include "light.h"
  30 #include "macros.h"
  31 #include "imports.h"
  32 #include "simple_list.h"
  33 #include "mtypes.h"
  34
  35 #include "math/m_translate.h"
  36
  37 #include "t_context.h"
  38 #include "t_pipeline.h"
  39
  40 #define LIGHT_TWOSIDE       0x1
  41 #define LIGHT_MATERIAL      0x2
  42 #define MAX_LIGHT_FUNC      0x4
  43
  44 typedef void (*light_func)( GLcontext *ctx,
  45                             struct vertex_buffer *VB,
  46                             struct tnl_pipeline_stage *stage,
  47                             GLvector4f *input );
  48
  49 /**
  50  * Information for updating current material attributes from vertex color,
  51  * for GL_COLOR_MATERIAL.
  52  */
  53 struct material_cursor {
  54    const GLfloat *ptr;    /* points to src vertex color (in VB array) */
  55    GLuint stride;         /* stride to next vertex color (bytes) */
  56    GLfloat *current;      /* points to material attribute to update */
  57    GLuint size;           /* vertex/color size: 1, 2, 3 or 4 */
  58 };
  59
  60 /**
  61  * Data private to this pipeline stage.
  62  */
  63 struct light_stage_data {
  64    GLvector4f Input;
  65    GLvector4f LitColor[2];
  66    GLvector4f LitSecondary[2];
  67    GLvector4f LitIndex[2];
  68    light_func *light_func_tab;
  69
  70    struct material_cursor mat[MAT_ATTRIB_MAX];
  71    GLuint mat_count;
  72    GLuint mat_bitmask;
  73 };
  74
  75
  76 #define LIGHT_STAGE_DATA(stage) ((struct light_stage_data *)(stage->privatePtr))
  77
  78
  79
  80 /**
  81  * In the case of colormaterial, the effected material attributes
  82  * should already have been bound to point to the incoming color data,
  83  * prior to running the pipeline.
  84  * This function copies the vertex's color to the material attributes
  85  * which are tracking glColor.
  86  * It's called per-vertex in the lighting loop.
  87  */
  88 static void
  89 update_materials(GLcontext *ctx, struct light_stage_data *store)
  90 {
  91    GLuint i;
  92
  93    for (i = 0 ; i < store->mat_count ; i++) {
  94       /* update the material */
  95       COPY_CLEAN_4V(store->mat[i].current, store->mat[i].size, store->mat[i].ptr);
  96       /* increment src vertex color pointer */
  97       STRIDE_F(store->mat[i].ptr, store->mat[i].stride);
  98    }
  99
 100    /* recompute derived light/material values */
 101    _mesa_update_material( ctx, store->mat_bitmask );
 102    /* XXX we should only call this if we're tracking/changing the specular
 103     * exponent.
 104     */
 105    _mesa_validate_all_lighting_tables( ctx );
 106 }
 107
 108
 109 /**
 110  * Prepare things prior to running the lighting stage.
 111  * Return number of material attributes which will track vertex color.
 112  */
 113 static GLuint
 114 prepare_materials(GLcontext *ctx,
 115                   struct vertex_buffer *VB, struct light_stage_data *store)
 116 {
 117    GLuint i;
 118
 119    store->mat_count = 0;
 120    store->mat_bitmask = 0;
 121
 122    /* Examine the ColorMaterialBitmask to determine which materials
 123     * track vertex color.  Override the material attribute's pointer
 124     * with the color pointer for each one.
 125     */
 126    if (ctx->Light.ColorMaterialEnabled) {
 127       const GLuint bitmask = ctx->Light.ColorMaterialBitmask;
 128       for (i = 0 ; i < MAT_ATTRIB_MAX ; i++)
 129          if (bitmask & (1<<i))
 130             VB->AttribPtr[_TNL_ATTRIB_MAT_FRONT_AMBIENT + i] = VB->ColorPtr[0];
 131    }
 132
 133    /* Now, for each material attribute that's tracking vertex color, save
 134     * some values (ptr, stride, size, current) that we'll need in
 135     * update_materials(), above, that'll actually copy the vertex color to
 136     * the material attribute(s).
 137     */
 138    for (i = _TNL_ATTRIB_MAT_FRONT_AMBIENT ; i < _TNL_ATTRIB_INDEX ; i++) {
 139       if (VB->AttribPtr[i]->stride) {
 140          const GLuint j = store->mat_count++;
 141          const GLuint attr = i - _TNL_ATTRIB_MAT_FRONT_AMBIENT;
 142          store->mat[j].ptr    = VB->AttribPtr[i]->start;
 143          store->mat[j].stride = VB->AttribPtr[i]->stride;
 144          store->mat[j].size   = VB->AttribPtr[i]->size;
 145          store->mat[j].current = ctx->Light.Material.Attrib[attr];
 146          store->mat_bitmask |= (1<<attr);
 147       }
 148    }
 149
 150    /* FIXME: Is this already done?
 151     */
 152    _mesa_update_material( ctx, ~0 );
 153    _mesa_validate_all_lighting_tables( ctx );
 154
 155    return store->mat_count;
 156 }
 157
 158 /* Tables for all the shading functions.
 159  */
 160 static light_func _tnl_light_tab[MAX_LIGHT_FUNC];
 161 static light_func _tnl_light_fast_tab[MAX_LIGHT_FUNC];
 162 static light_func _tnl_light_fast_single_tab[MAX_LIGHT_FUNC];
 163 static light_func _tnl_light_spec_tab[MAX_LIGHT_FUNC];
 164 static light_func _tnl_light_ci_tab[MAX_LIGHT_FUNC];
 165
 166 #define TAG(x)           x
 167 #define IDX              (0)
 168 #include "t_vb_lighttmp.h"
 169
 170 #define TAG(x)           x##_twoside
 171 #define IDX              (LIGHT_TWOSIDE)
 172 #include "t_vb_lighttmp.h"
 173
 174 #define TAG(x)           x##_material
 175 #define IDX              (LIGHT_MATERIAL)
 176 #include "t_vb_lighttmp.h"
 177
 178 #define TAG(x)           x##_twoside_material
 179 #define IDX              (LIGHT_TWOSIDE|LIGHT_MATERIAL)
 180 #include "t_vb_lighttmp.h"
 181
 182
 183 static void init_lighting_tables( void )
 184 {
 185    static int done;
 186
 187    if (!done) {
 188       init_light_tab();
 189       init_light_tab_twoside();
 190       init_light_tab_material();
 191       init_light_tab_twoside_material();
 192       done = 1;
 193    }
 194 }
 195
 196
 197 static GLboolean run_lighting( GLcontext *ctx,
 198                                struct tnl_pipeline_stage *stage )
 199 {
 200    struct light_stage_data *store = LIGHT_STAGE_DATA(stage);
 201    TNLcontext *tnl = TNL_CONTEXT(ctx);
 202    struct vertex_buffer *VB = &tnl->vb;
 203    GLvector4f *input = ctx->_NeedEyeCoords ? VB->EyePtr : VB->ObjPtr;
 204    GLuint idx;
 205
 206    if (ctx->ShaderObjects.CurrentProgram != NULL)
 207       return GL_TRUE;
 208
 209    if (!ctx->Light.Enabled || ctx->VertexProgram._Enabled)
 210       return GL_TRUE;
 211
 212    /* Make sure we can talk about position x,y and z:
 213     */
 214    if (input->size <= 2 && input == VB->ObjPtr) {
 215
 216       _math_trans_4f( store->Input.data,
 217                       VB->ObjPtr->data,
 218                       VB->ObjPtr->stride,
 219                       GL_FLOAT,
 220                       VB->ObjPtr->size,
 221                       0,
 222                       VB->Count );
 223
 224       if (input->size <= 2) {
 225          /* Clean z.
 226           */
 227          _mesa_vector4f_clean_elem(&store->Input, VB->Count, 2);
 228       }
 229
 230       if (input->size <= 1) {
 231          /* Clean y.
 232           */
 233          _mesa_vector4f_clean_elem(&store->Input, VB->Count, 1);
 234       }
 235
 236       input = &store->Input;
 237    }
 238
 239    idx = 0;
 240
 241    if (prepare_materials( ctx, VB, store ))
 242       idx |= LIGHT_MATERIAL;
 243
 244    if (ctx->Light.Model.TwoSide)
 245       idx |= LIGHT_TWOSIDE;
 246
 247    /* The individual functions know about replaying side-effects
 248     * vs. full re-execution.
 249     */
 250    store->light_func_tab[idx]( ctx, VB, stage, input );
 251
 252    VB->AttribPtr[_TNL_ATTRIB_COLOR0] = VB->ColorPtr[0];
 253    VB->AttribPtr[_TNL_ATTRIB_COLOR1] = VB->SecondaryColorPtr[0];
 254    VB->AttribPtr[_TNL_ATTRIB_INDEX] = VB->IndexPtr[0];
 255
 256    return GL_TRUE;
 257 }
 258
 259
 260 /* Called in place of do_lighting when the light table may have changed.
 261  */
 262 static void validate_lighting( GLcontext *ctx,
 263                                         struct tnl_pipeline_stage *stage )
 264 {
 265    light_func *tab;
 266
 267    if (ctx->ShaderObjects.CurrentProgram != NULL)
 268       return;
 269
 270    if (!ctx->Light.Enabled || ctx->VertexProgram._Enabled)
 271       return;
 272
 273    if (ctx->Visual.rgbMode) {
 274       if (ctx->Light._NeedVertices) {
 275          if (ctx->Light.Model.ColorControl == GL_SEPARATE_SPECULAR_COLOR)
 276             tab = _tnl_light_spec_tab;
 277          else
 278             tab = _tnl_light_tab;
 279       }
 280       else {
 281          if (ctx->Light.EnabledList.next == ctx->Light.EnabledList.prev)
 282             tab = _tnl_light_fast_single_tab;
 283          else
 284             tab = _tnl_light_fast_tab;
 285       }
 286    }
 287    else
 288       tab = _tnl_light_ci_tab;
 289
 290
 291    LIGHT_STAGE_DATA(stage)->light_func_tab = tab;
 292
 293    /* This and the above should only be done on _NEW_LIGHT:
 294     */
 295    TNL_CONTEXT(ctx)->Driver.NotifyMaterialChange( ctx );
 296 }
 297
 298
 299
 300 /* Called the first time stage->run is called.  In effect, don't
 301  * allocate data until the first time the stage is run.
 302  */
 303 static GLboolean init_lighting( GLcontext *ctx,
 304                                 struct tnl_pipeline_stage *stage )
 305 {
 306    TNLcontext *tnl = TNL_CONTEXT(ctx);
 307    struct light_stage_data *store;
 308    GLuint size = tnl->vb.Size;
 309
 310    stage->privatePtr = MALLOC(sizeof(*store));
 311    store = LIGHT_STAGE_DATA(stage);
 312    if (!store)
 313       return GL_FALSE;
 314
 315    /* Do onetime init.
 316     */
 317    init_lighting_tables();
 318
 319    _mesa_vector4f_alloc( &store->Input, 0, size, 32 );
 320    _mesa_vector4f_alloc( &store->LitColor[0], 0, size, 32 );
 321    _mesa_vector4f_alloc( &store->LitColor[1], 0, size, 32 );
 322    _mesa_vector4f_alloc( &store->LitSecondary[0], 0, size, 32 );
 323    _mesa_vector4f_alloc( &store->LitSecondary[1], 0, size, 32 );
 324    _mesa_vector4f_alloc( &store->LitIndex[0], 0, size, 32 );
 325    _mesa_vector4f_alloc( &store->LitIndex[1], 0, size, 32 );
 326
 327    store->LitColor[0].size = 4;
 328    store->LitColor[1].size = 4;
 329    store->LitSecondary[0].size = 3;
 330    store->LitSecondary[1].size = 3;
 331
 332    store->LitIndex[0].size = 1;
 333    store->LitIndex[0].stride = sizeof(GLfloat);
 334    store->LitIndex[1].size = 1;
 335    store->LitIndex[1].stride = sizeof(GLfloat);
 336
 337    return GL_TRUE;
 338 }
 339
 340
 341
 342
 343 static void dtr( struct tnl_pipeline_stage *stage )
 344 {
 345    struct light_stage_data *store = LIGHT_STAGE_DATA(stage);
 346
 347    if (store) {
 348       _mesa_vector4f_free( &store->Input );
 349       _mesa_vector4f_free( &store->LitColor[0] );
 350       _mesa_vector4f_free( &store->LitColor[1] );
 351       _mesa_vector4f_free( &store->LitSecondary[0] );
 352       _mesa_vector4f_free( &store->LitSecondary[1] );
 353       _mesa_vector4f_free( &store->LitIndex[0] );
 354       _mesa_vector4f_free( &store->LitIndex[1] );
 355       FREE( store );
 356       stage->privatePtr = NULL;
 357    }
 358 }
 359
 360 const struct tnl_pipeline_stage _tnl_lighting_stage =
 361 {
 362    "lighting",                  /* name */
 363    NULL,                        /* private_data */
 364    init_lighting,
 365    dtr,                         /* destroy */
 366    validate_lighting,
 367    run_lighting
 368 };