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