src/mesa/vbo/vbo_exec_array.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2003 Tungsten Graphics, Inc., Cedar Park, Texas.
   4  * All Rights Reserved.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * copy of this software and associated documentation files (the
   8  * "Software"), to deal in the Software without restriction, including
   9  * without limitation the rights to use, copy, modify, merge, publish,
  10  * distribute, sub license, and/or sell copies of the Software, and to
  11  * permit persons to whom the Software is furnished to do so, subject to
  12  * the following conditions:
  13  *
  14  * The above copyright notice and this permission notice (including the
  15  * next paragraph) shall be included in all copies or substantial portions
  16  * 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
  20  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
  21  * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
  22  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  23  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  24  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25  *
  26  **************************************************************************/
  27
  28 #include "main/glheader.h"
  29 #include "main/context.h"
  30 #include "main/state.h"
  31 #include "main/api_validate.h"
  32 #include "main/api_noop.h"
  33 #include "main/varray.h"
  34 #include "glapi/dispatch.h"
  35
  36 #include "vbo_context.h"
  37
  38 /* Compute min and max elements for drawelements calls.
  39  */
  40 static void get_minmax_index( GLuint count, GLuint type,
  41                               const GLvoid *indices,
  42                               GLuint *min_index,
  43                               GLuint *max_index)
  44 {
  45    GLuint i;
  46
  47    switch(type) {
  48    case GL_UNSIGNED_INT: {
  49       const GLuint *ui_indices = (const GLuint *)indices;
  50       GLuint max_ui = ui_indices[0];
  51       GLuint min_ui = ui_indices[0];
  52       for (i = 1; i < count; i++) {
  53          if (ui_indices[i] > max_ui) max_ui = ui_indices[i];
  54          if (ui_indices[i] < min_ui) min_ui = ui_indices[i];
  55       }
  56       *min_index = min_ui;
  57       *max_index = max_ui;
  58       break;
  59    }
  60    case GL_UNSIGNED_SHORT: {
  61       const GLushort *us_indices = (const GLushort *)indices;
  62       GLuint max_us = us_indices[0];
  63       GLuint min_us = us_indices[0];
  64       for (i = 1; i < count; i++) {
  65          if (us_indices[i] > max_us) max_us = us_indices[i];
  66          if (us_indices[i] < min_us) min_us = us_indices[i];
  67       }
  68       *min_index = min_us;
  69       *max_index = max_us;
  70       break;
  71    }
  72    case GL_UNSIGNED_BYTE: {
  73       const GLubyte *ub_indices = (const GLubyte *)indices;
  74       GLuint max_ub = ub_indices[0];
  75       GLuint min_ub = ub_indices[0];
  76       for (i = 1; i < count; i++) {
  77          if (ub_indices[i] > max_ub) max_ub = ub_indices[i];
  78          if (ub_indices[i] < min_ub) min_ub = ub_indices[i];
  79       }
  80       *min_index = min_ub;
  81       *max_index = max_ub;
  82       break;
  83    }
  84    default:
  85       assert(0);
  86       break;
  87    }
  88 }
  89
  90
  91 /* Just translate the arrayobj into a sane layout.
  92  */
  93 static void bind_array_obj( GLcontext *ctx )
  94 {
  95    struct vbo_context *vbo = vbo_context(ctx);
  96    struct vbo_exec_context *exec = &vbo->exec;
  97    GLuint i;
  98
  99    /* TODO: Fix the ArrayObj struct to keep legacy arrays in an array
 100     * rather than as individual named arrays.  Then this function can
 101     * go away.
 102     */
 103    exec->array.legacy_array[VERT_ATTRIB_POS] = &ctx->Array.ArrayObj->Vertex;
 104    exec->array.legacy_array[VERT_ATTRIB_WEIGHT] = &vbo->legacy_currval[VERT_ATTRIB_WEIGHT];
 105    exec->array.legacy_array[VERT_ATTRIB_NORMAL] = &ctx->Array.ArrayObj->Normal;
 106    exec->array.legacy_array[VERT_ATTRIB_COLOR0] = &ctx->Array.ArrayObj->Color;
 107    exec->array.legacy_array[VERT_ATTRIB_COLOR1] = &ctx->Array.ArrayObj->SecondaryColor;
 108    exec->array.legacy_array[VERT_ATTRIB_FOG] = &ctx->Array.ArrayObj->FogCoord;
 109    exec->array.legacy_array[VERT_ATTRIB_COLOR_INDEX] = &ctx->Array.ArrayObj->Index;
 110    if (ctx->Array.ArrayObj->PointSize.Enabled) {
 111       /* this aliases COLOR_INDEX */
 112       exec->array.legacy_array[VERT_ATTRIB_POINT_SIZE] = &ctx->Array.ArrayObj->PointSize;
 113    }
 114    exec->array.legacy_array[VERT_ATTRIB_EDGEFLAG] = &ctx->Array.ArrayObj->EdgeFlag;
 115
 116    for (i = 0; i < 8; i++)
 117       exec->array.legacy_array[VERT_ATTRIB_TEX0 + i] = &ctx->Array.ArrayObj->TexCoord[i];
 118
 119    for (i = 0; i < VERT_ATTRIB_MAX; i++)
 120       exec->array.generic_array[i] = &ctx->Array.ArrayObj->VertexAttrib[i];
 121
 122    exec->array.array_obj = ctx->Array.ArrayObj->Name;
 123 }
 124
 125 static void recalculate_input_bindings( GLcontext *ctx )
 126 {
 127    struct vbo_context *vbo = vbo_context(ctx);
 128    struct vbo_exec_context *exec = &vbo->exec;
 129    const struct gl_client_array **inputs = &exec->array.inputs[0];
 130    GLuint i;
 131
 132    exec->array.program_mode = get_program_mode(ctx);
 133    exec->array.enabled_flags = ctx->Array.ArrayObj->_Enabled;
 134
 135    switch (exec->array.program_mode) {
 136    case VP_NONE:
 137       /* When no vertex program is active, we put the material values
 138        * into the generic slots.  This is the only situation where
 139        * material values are available as per-vertex attributes.
 140        */
 141       for (i = 0; i <= VERT_ATTRIB_TEX7; i++) {
 142          if (exec->array.legacy_array[i]->Enabled)
 143             inputs[i] = exec->array.legacy_array[i];
 144          else
 145             inputs[i] = &vbo->legacy_currval[i];
 146       }
 147
 148       for (i = 0; i < MAT_ATTRIB_MAX; i++) {
 149          inputs[VERT_ATTRIB_GENERIC0 + i] = &vbo->mat_currval[i];
 150       }
 151
 152       /* Could use just about anything, just to fill in the empty
 153        * slots:
 154        */
 155       for (i = MAT_ATTRIB_MAX; i < VERT_ATTRIB_MAX - VERT_ATTRIB_GENERIC0; i++)
 156          inputs[VERT_ATTRIB_GENERIC0 + i] = &vbo->generic_currval[i];
 157
 158       break;
 159    case VP_NV:
 160       /* NV_vertex_program - attribute arrays alias and override
 161        * conventional, legacy arrays.  No materials, and the generic
 162        * slots are vacant.
 163        */
 164       for (i = 0; i <= VERT_ATTRIB_TEX7; i++) {
 165          if (exec->array.generic_array[i]->Enabled)
 166             inputs[i] = exec->array.generic_array[i];
 167          else if (exec->array.legacy_array[i]->Enabled)
 168             inputs[i] = exec->array.legacy_array[i];
 169          else
 170             inputs[i] = &vbo->legacy_currval[i];
 171       }
 172
 173       /* Could use just about anything, just to fill in the empty
 174        * slots:
 175        */
 176       for (i = VERT_ATTRIB_GENERIC0; i < VERT_ATTRIB_MAX; i++)
 177          inputs[i] = &vbo->generic_currval[i - VERT_ATTRIB_GENERIC0];
 178
 179       break;
 180    case VP_ARB:
 181       /* ARB_vertex_program - Only the attribute zero (position) array
 182        * aliases and overrides the legacy position array.
 183        *
 184        * Otherwise, legacy attributes available in the legacy slots,
 185        * generic attributes in the generic slots and materials are not
 186        * available as per-vertex attributes.
 187        */
 188       if (exec->array.generic_array[0]->Enabled)
 189          inputs[0] = exec->array.generic_array[0];
 190       else if (exec->array.legacy_array[0]->Enabled)
 191          inputs[0] = exec->array.legacy_array[0];
 192       else
 193          inputs[0] = &vbo->legacy_currval[0];
 194
 195
 196       for (i = 1; i <= VERT_ATTRIB_TEX7; i++) {
 197          if (exec->array.legacy_array[i]->Enabled)
 198             inputs[i] = exec->array.legacy_array[i];
 199          else
 200             inputs[i] = &vbo->legacy_currval[i];
 201       }
 202
 203       for (i = 0; i < 16; i++) {
 204          if (exec->array.generic_array[i]->Enabled)
 205             inputs[VERT_ATTRIB_GENERIC0 + i] = exec->array.generic_array[i];
 206          else
 207             inputs[VERT_ATTRIB_GENERIC0 + i] = &vbo->generic_currval[i];
 208       }
 209       break;
 210    }
 211 }
 212
 213 static void bind_arrays( GLcontext *ctx )
 214 {
 215 #if 0
 216    if (ctx->Array.ArrayObj.Name != exec->array.array_obj) {
 217       bind_array_obj(ctx);
 218       recalculate_input_bindings(ctx);
 219    }
 220    else if (exec->array.program_mode != get_program_mode(ctx) ||
 221             exec->array.enabled_flags != ctx->Array.ArrayObj->_Enabled) {
 222
 223       recalculate_input_bindings(ctx);
 224    }
 225 #else
 226    bind_array_obj(ctx);
 227    recalculate_input_bindings(ctx);
 228 #endif
 229 }
 230
 231
 232
 233 /***********************************************************************
 234  * API functions.
 235  */
 236
 237 static void GLAPIENTRY
 238 vbo_exec_DrawArrays(GLenum mode, GLint start, GLsizei count)
 239 {
 240    GET_CURRENT_CONTEXT(ctx);
 241    struct vbo_context *vbo = vbo_context(ctx);
 242    struct vbo_exec_context *exec = &vbo->exec;
 243    struct _mesa_prim prim[1];
 244
 245    if (!_mesa_validate_DrawArrays( ctx, mode, start, count ))
 246       return;
 247
 248    FLUSH_CURRENT( ctx, 0 );
 249
 250    if (ctx->NewState)
 251       _mesa_update_state( ctx );
 252
 253    if (!vbo_validate_shaders(ctx)) {
 254       _mesa_error(ctx, GL_INVALID_OPERATION, "glDrawArrays(bad shader)");
 255       return;
 256    }
 257
 258    bind_arrays( ctx );
 259
 260    prim[0].begin = 1;
 261    prim[0].end = 1;
 262    prim[0].weak = 0;
 263    prim[0].pad = 0;
 264    prim[0].mode = mode;
 265    prim[0].start = start;
 266    prim[0].count = count;
 267    prim[0].indexed = 0;
 268
 269    vbo->draw_prims( ctx, exec->array.inputs, prim, 1, NULL, start, start + count - 1 );
 270 }
 271
 272
 273
 274 static void GLAPIENTRY
 275 vbo_exec_DrawRangeElements(GLenum mode,
 276                            GLuint start, GLuint end,
 277                            GLsizei count, GLenum type, const GLvoid *indices)
 278 {
 279    GET_CURRENT_CONTEXT(ctx);
 280    struct vbo_context *vbo = vbo_context(ctx);
 281    struct vbo_exec_context *exec = &vbo->exec;
 282    struct _mesa_index_buffer ib;
 283    struct _mesa_prim prim[1];
 284
 285    if (!_mesa_validate_DrawRangeElements( ctx, mode, start, end, count, type, indices ))
 286       return;
 287
 288    FLUSH_CURRENT( ctx, 0 );
 289
 290    if (ctx->NewState)
 291       _mesa_update_state( ctx );
 292
 293    if (!vbo_validate_shaders(ctx)) {
 294       _mesa_error(ctx, GL_INVALID_OPERATION, "glDrawRangeElements(bad shader)");
 295       return;
 296    }
 297
 298    bind_arrays( ctx );
 299
 300    ib.count = count;
 301    ib.type = type;
 302    ib.obj = ctx->Array.ElementArrayBufferObj;
 303    ib.ptr = indices;
 304
 305    prim[0].begin = 1;
 306    prim[0].end = 1;
 307    prim[0].weak = 0;
 308    prim[0].pad = 0;
 309    prim[0].mode = mode;
 310    prim[0].start = 0;
 311    prim[0].count = count;
 312    prim[0].indexed = 1;
 313
 314    /* Need to give special consideration to rendering a range of
 315     * indices starting somewhere above zero.  Typically the
 316     * application is issuing multiple DrawRangeElements() to draw
 317     * successive primitives layed out linearly in the vertex arrays.
 318     * Unless the vertex arrays are all in a VBO (or locked as with
 319     * CVA), the OpenGL semantics imply that we need to re-read or
 320     * re-upload the vertex data on each draw call.
 321     *
 322     * In the case of hardware tnl, we want to avoid starting the
 323     * upload at zero, as it will mean every draw call uploads an
 324     * increasing amount of not-used vertex data.  Worse - in the
 325     * software tnl module, all those vertices might be transformed and
 326     * lit but never rendered.
 327     *
 328     * If we just upload or transform the vertices in start..end,
 329     * however, the indices will be incorrect.
 330     *
 331     * At this level, we don't know exactly what the requirements of
 332     * the backend are going to be, though it will likely boil down to
 333     * either:
 334     *
 335     * 1) Do nothing, everything is in a VBO and is processed once
 336     *       only.
 337     *
 338     * 2) Adjust the indices and vertex arrays so that start becomes
 339     *    zero.
 340     *
 341     * Rather than doing anything here, I'll provide a helper function
 342     * for the latter case elsewhere.
 343     */
 344
 345    vbo->draw_prims( ctx, exec->array.inputs, prim, 1, &ib, start, end );
 346 }
 347
 348 static void GLAPIENTRY
 349 vbo_exec_DrawElements(GLenum mode, GLsizei count, GLenum type, const GLvoid *indices)
 350 {
 351    GET_CURRENT_CONTEXT(ctx);
 352    GLuint min_index = 0;
 353    GLuint max_index = 0;
 354
 355    if (!_mesa_validate_DrawElements( ctx, mode, count, type, indices ))
 356       return;
 357
 358    if (!vbo_validate_shaders(ctx)) {
 359       _mesa_error(ctx, GL_INVALID_OPERATION, "glDrawElements(bad shader)");
 360       return;
 361    }
 362
 363    if (ctx->Array.ElementArrayBufferObj->Name) {
 364       const GLvoid *map = ctx->Driver.MapBuffer(ctx,
 365                                                  GL_ELEMENT_ARRAY_BUFFER_ARB,
 366                                                  GL_READ_ONLY,
 367                                                  ctx->Array.ElementArrayBufferObj);
 368
 369       get_minmax_index(count, type, ADD_POINTERS(map, indices), &min_index, &max_index);
 370
 371       ctx->Driver.UnmapBuffer(ctx,
 372                               GL_ELEMENT_ARRAY_BUFFER_ARB,
 373                               ctx->Array.ElementArrayBufferObj);
 374    }
 375    else {
 376       get_minmax_index(count, type, indices, &min_index, &max_index);
 377    }
 378
 379    vbo_exec_DrawRangeElements(mode, min_index, max_index, count, type, indices);
 380 }
 381
 382
 383 /***********************************************************************
 384  * Initialization
 385  */
 386
 387
 388
 389
 390 void vbo_exec_array_init( struct vbo_exec_context *exec )
 391 {
 392 #if 1
 393    exec->vtxfmt.DrawArrays = vbo_exec_DrawArrays;
 394    exec->vtxfmt.DrawElements = vbo_exec_DrawElements;
 395    exec->vtxfmt.DrawRangeElements = vbo_exec_DrawRangeElements;
 396 #else
 397    exec->vtxfmt.DrawArrays = _mesa_noop_DrawArrays;
 398    exec->vtxfmt.DrawElements = _mesa_noop_DrawElements;
 399    exec->vtxfmt.DrawRangeElements = _mesa_noop_DrawRangeElements;
 400 #endif
 401 }
 402
 403
 404 void vbo_exec_array_destroy( struct vbo_exec_context *exec )
 405 {
 406    /* nothing to do */
 407 }
 408
 409
 410 /* This API entrypoint is not ordinarily used */
 411 void GLAPIENTRY
 412 _mesa_DrawArrays(GLenum mode, GLint first, GLsizei count)
 413 {
 414    vbo_exec_DrawArrays(mode, first, count);
 415 }
 416
 417
 418 /* This API entrypoint is not ordinarily used */
 419 void GLAPIENTRY
 420 _mesa_DrawElements(GLenum mode, GLsizei count, GLenum type,
 421                    const GLvoid *indices)
 422 {
 423    vbo_exec_DrawElements(mode, count, type, indices);
 424 }
 425
 426
 427 /* This API entrypoint is not ordinarily used */
 428 void GLAPIENTRY
 429 _mesa_DrawRangeElements(GLenum mode, GLuint start, GLuint end, GLsizei count,
 430                         GLenum type, const GLvoid *indices)
 431 {
 432    vbo_exec_DrawRangeElements(mode, start, end, count, type, indices);
 433 }