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