src/mesa/main/attrib.c

   1 /*
   2  * Mesa 3-D graphics library
   3  * Version:  7.6
   4  *
   5  * Copyright (C) 1999-2008  Brian Paul   All Rights Reserved.
   6  * Copyright (C) 2009  VMware, Inc.   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 #include "glheader.h"
  27 #include "imports.h"
  28 #include "accum.h"
  29 #include "arrayobj.h"
  30 #include "attrib.h"
  31 #include "blend.h"
  32 #include "buffers.h"
  33 #include "bufferobj.h"
  34 #include "clear.h"
  35 #include "colormac.h"
  36 #include "context.h"
  37 #include "depth.h"
  38 #include "enable.h"
  39 #include "enums.h"
  40 #include "fog.h"
  41 #include "hint.h"
  42 #include "light.h"
  43 #include "lines.h"
  44 #include "macros.h"
  45 #include "matrix.h"
  46 #include "mfeatures.h"
  47 #include "multisample.h"
  48 #include "points.h"
  49 #include "polygon.h"
  50 #include "shared.h"
  51 #include "scissor.h"
  52 #include "stencil.h"
  53 #include "texenv.h"
  54 #include "texgen.h"
  55 #include "texobj.h"
  56 #include "texparam.h"
  57 #include "texstate.h"
  58 #include "varray.h"
  59 #include "viewport.h"
  60 #include "mtypes.h"
  61 #include "main/dispatch.h"
  62 #include "hash.h"
  63 #include <stdbool.h>
  64
  65
  66 /**
  67  * glEnable()/glDisable() attribute group (GL_ENABLE_BIT).
  68  */
  69 struct gl_enable_attrib
  70 {
  71    GLboolean AlphaTest;
  72    GLboolean AutoNormal;
  73    GLboolean Blend;
  74    GLbitfield ClipPlanes;
  75    GLboolean ColorMaterial;
  76    GLboolean CullFace;
  77    GLboolean DepthClamp;
  78    GLboolean DepthTest;
  79    GLboolean Dither;
  80    GLboolean Fog;
  81    GLboolean Light[MAX_LIGHTS];
  82    GLboolean Lighting;
  83    GLboolean LineSmooth;
  84    GLboolean LineStipple;
  85    GLboolean IndexLogicOp;
  86    GLboolean ColorLogicOp;
  87
  88    GLboolean Map1Color4;
  89    GLboolean Map1Index;
  90    GLboolean Map1Normal;
  91    GLboolean Map1TextureCoord1;
  92    GLboolean Map1TextureCoord2;
  93    GLboolean Map1TextureCoord3;
  94    GLboolean Map1TextureCoord4;
  95    GLboolean Map1Vertex3;
  96    GLboolean Map1Vertex4;
  97    GLboolean Map1Attrib[16];  /* GL_NV_vertex_program */
  98    GLboolean Map2Color4;
  99    GLboolean Map2Index;
 100    GLboolean Map2Normal;
 101    GLboolean Map2TextureCoord1;
 102    GLboolean Map2TextureCoord2;
 103    GLboolean Map2TextureCoord3;
 104    GLboolean Map2TextureCoord4;
 105    GLboolean Map2Vertex3;
 106    GLboolean Map2Vertex4;
 107    GLboolean Map2Attrib[16];  /* GL_NV_vertex_program */
 108
 109    GLboolean Normalize;
 110    GLboolean PixelTexture;
 111    GLboolean PointSmooth;
 112    GLboolean PolygonOffsetPoint;
 113    GLboolean PolygonOffsetLine;
 114    GLboolean PolygonOffsetFill;
 115    GLboolean PolygonSmooth;
 116    GLboolean PolygonStipple;
 117    GLboolean RescaleNormals;
 118    GLboolean Scissor;
 119    GLboolean Stencil;
 120    GLboolean StencilTwoSide;          /* GL_EXT_stencil_two_side */
 121    GLboolean MultisampleEnabled;      /* GL_ARB_multisample */
 122    GLboolean SampleAlphaToCoverage;   /* GL_ARB_multisample */
 123    GLboolean SampleAlphaToOne;        /* GL_ARB_multisample */
 124    GLboolean SampleCoverage;          /* GL_ARB_multisample */
 125    GLboolean RasterPositionUnclipped; /* GL_IBM_rasterpos_clip */
 126
 127    GLbitfield Texture[MAX_TEXTURE_UNITS];
 128    GLbitfield TexGen[MAX_TEXTURE_UNITS];
 129
 130    /* GL_ARB_vertex_program / GL_NV_vertex_program */
 131    GLboolean VertexProgram;
 132    GLboolean VertexProgramPointSize;
 133    GLboolean VertexProgramTwoSide;
 134
 135    /* GL_ARB_point_sprite / GL_NV_point_sprite */
 136    GLboolean PointSprite;
 137    GLboolean FragmentShaderATI;
 138 };
 139
 140
 141 /**
 142  * Node for the attribute stack.
 143  */
 144 struct gl_attrib_node
 145 {
 146    GLbitfield kind;
 147    void *data;
 148    struct gl_attrib_node *next;
 149 };
 150
 151
 152
 153 /**
 154  * Special struct for saving/restoring texture state (GL_TEXTURE_BIT)
 155  */
 156 struct texture_state
 157 {
 158    struct gl_texture_attrib Texture;  /**< The usual context state */
 159
 160    /** to save per texture object state (wrap modes, filters, etc): */
 161    struct gl_texture_object SavedObj[MAX_TEXTURE_UNITS][NUM_TEXTURE_TARGETS];
 162
 163    /**
 164     * To save references to texture objects (so they don't get accidentally
 165     * deleted while saved in the attribute stack).
 166     */
 167    struct gl_texture_object *SavedTexRef[MAX_TEXTURE_UNITS][NUM_TEXTURE_TARGETS];
 168
 169    /* We need to keep a reference to the shared state.  That's where the
 170     * default texture objects are kept.  We don't want that state to be
 171     * freed while the attribute stack contains pointers to any default
 172     * texture objects.
 173     */
 174    struct gl_shared_state *SharedRef;
 175 };
 176
 177
 178 #if FEATURE_attrib_stack
 179
 180
 181 /**
 182  * Allocate new attribute node of given type/kind.  Attach payload data.
 183  * Insert it into the linked list named by 'head'.
 184  */
 185 static void
 186 save_attrib_data(struct gl_attrib_node **head,
 187                  GLbitfield kind, void *payload)
 188 {
 189    struct gl_attrib_node *n = MALLOC_STRUCT(gl_attrib_node);
 190    if (n) {
 191       n->kind = kind;
 192       n->data = payload;
 193       /* insert at head */
 194       n->next = *head;
 195       *head = n;
 196    }
 197    else {
 198       /* out of memory! */
 199    }
 200 }
 201
 202
 203 void GLAPIENTRY
 204 _mesa_PushAttrib(GLbitfield mask)
 205 {
 206    struct gl_attrib_node *head;
 207
 208    GET_CURRENT_CONTEXT(ctx);
 209    ASSERT_OUTSIDE_BEGIN_END(ctx);
 210
 211    if (MESA_VERBOSE & VERBOSE_API)
 212       _mesa_debug(ctx, "glPushAttrib %x\n", (int) mask);
 213
 214    if (ctx->AttribStackDepth >= MAX_ATTRIB_STACK_DEPTH) {
 215       _mesa_error( ctx, GL_STACK_OVERFLOW, "glPushAttrib" );
 216       return;
 217    }
 218
 219    /* Build linked list of attribute nodes which save all attribute */
 220    /* groups specified by the mask. */
 221    head = NULL;
 222
 223    if (mask & GL_ACCUM_BUFFER_BIT) {
 224       struct gl_accum_attrib *attr;
 225       attr = MALLOC_STRUCT( gl_accum_attrib );
 226       memcpy( attr, &ctx->Accum, sizeof(struct gl_accum_attrib) );
 227       save_attrib_data(&head, GL_ACCUM_BUFFER_BIT, attr);
 228    }
 229
 230    if (mask & GL_COLOR_BUFFER_BIT) {
 231       GLuint i;
 232       struct gl_colorbuffer_attrib *attr;
 233       attr = MALLOC_STRUCT( gl_colorbuffer_attrib );
 234       memcpy( attr, &ctx->Color, sizeof(struct gl_colorbuffer_attrib) );
 235       /* push the Draw FBO's DrawBuffer[] state, not ctx->Color.DrawBuffer[] */
 236       for (i = 0; i < ctx->Const.MaxDrawBuffers; i ++)
 237          attr->DrawBuffer[i] = ctx->DrawBuffer->ColorDrawBuffer[i];
 238       save_attrib_data(&head, GL_COLOR_BUFFER_BIT, attr);
 239    }
 240
 241    if (mask & GL_CURRENT_BIT) {
 242       struct gl_current_attrib *attr;
 243       FLUSH_CURRENT( ctx, 0 );
 244       attr = MALLOC_STRUCT( gl_current_attrib );
 245       memcpy( attr, &ctx->Current, sizeof(struct gl_current_attrib) );
 246       save_attrib_data(&head, GL_CURRENT_BIT, attr);
 247    }
 248
 249    if (mask & GL_DEPTH_BUFFER_BIT) {
 250       struct gl_depthbuffer_attrib *attr;
 251       attr = MALLOC_STRUCT( gl_depthbuffer_attrib );
 252       memcpy( attr, &ctx->Depth, sizeof(struct gl_depthbuffer_attrib) );
 253       save_attrib_data(&head, GL_DEPTH_BUFFER_BIT, attr);
 254    }
 255
 256    if (mask & GL_ENABLE_BIT) {
 257       struct gl_enable_attrib *attr;
 258       GLuint i;
 259       attr = MALLOC_STRUCT( gl_enable_attrib );
 260       /* Copy enable flags from all other attributes into the enable struct. */
 261       attr->AlphaTest = ctx->Color.AlphaEnabled;
 262       attr->AutoNormal = ctx->Eval.AutoNormal;
 263       attr->Blend = ctx->Color.BlendEnabled;
 264       attr->ClipPlanes = ctx->Transform.ClipPlanesEnabled;
 265       attr->ColorMaterial = ctx->Light.ColorMaterialEnabled;
 266       attr->CullFace = ctx->Polygon.CullFlag;
 267       attr->DepthClamp = ctx->Transform.DepthClamp;
 268       attr->DepthTest = ctx->Depth.Test;
 269       attr->Dither = ctx->Color.DitherFlag;
 270       attr->Fog = ctx->Fog.Enabled;
 271       for (i = 0; i < ctx->Const.MaxLights; i++) {
 272          attr->Light[i] = ctx->Light.Light[i].Enabled;
 273       }
 274       attr->Lighting = ctx->Light.Enabled;
 275       attr->LineSmooth = ctx->Line.SmoothFlag;
 276       attr->LineStipple = ctx->Line.StippleFlag;
 277       attr->IndexLogicOp = ctx->Color.IndexLogicOpEnabled;
 278       attr->ColorLogicOp = ctx->Color.ColorLogicOpEnabled;
 279       attr->Map1Color4 = ctx->Eval.Map1Color4;
 280       attr->Map1Index = ctx->Eval.Map1Index;
 281       attr->Map1Normal = ctx->Eval.Map1Normal;
 282       attr->Map1TextureCoord1 = ctx->Eval.Map1TextureCoord1;
 283       attr->Map1TextureCoord2 = ctx->Eval.Map1TextureCoord2;
 284       attr->Map1TextureCoord3 = ctx->Eval.Map1TextureCoord3;
 285       attr->Map1TextureCoord4 = ctx->Eval.Map1TextureCoord4;
 286       attr->Map1Vertex3 = ctx->Eval.Map1Vertex3;
 287       attr->Map1Vertex4 = ctx->Eval.Map1Vertex4;
 288       memcpy(attr->Map1Attrib, ctx->Eval.Map1Attrib, sizeof(ctx->Eval.Map1Attrib));
 289       attr->Map2Color4 = ctx->Eval.Map2Color4;
 290       attr->Map2Index = ctx->Eval.Map2Index;
 291       attr->Map2Normal = ctx->Eval.Map2Normal;
 292       attr->Map2TextureCoord1 = ctx->Eval.Map2TextureCoord1;
 293       attr->Map2TextureCoord2 = ctx->Eval.Map2TextureCoord2;
 294       attr->Map2TextureCoord3 = ctx->Eval.Map2TextureCoord3;
 295       attr->Map2TextureCoord4 = ctx->Eval.Map2TextureCoord4;
 296       attr->Map2Vertex3 = ctx->Eval.Map2Vertex3;
 297       attr->Map2Vertex4 = ctx->Eval.Map2Vertex4;
 298       memcpy(attr->Map2Attrib, ctx->Eval.Map2Attrib, sizeof(ctx->Eval.Map2Attrib));
 299       attr->Normalize = ctx->Transform.Normalize;
 300       attr->RasterPositionUnclipped = ctx->Transform.RasterPositionUnclipped;
 301       attr->PointSmooth = ctx->Point.SmoothFlag;
 302       attr->PointSprite = ctx->Point.PointSprite;
 303       attr->PolygonOffsetPoint = ctx->Polygon.OffsetPoint;
 304       attr->PolygonOffsetLine = ctx->Polygon.OffsetLine;
 305       attr->PolygonOffsetFill = ctx->Polygon.OffsetFill;
 306       attr->PolygonSmooth = ctx->Polygon.SmoothFlag;
 307       attr->PolygonStipple = ctx->Polygon.StippleFlag;
 308       attr->RescaleNormals = ctx->Transform.RescaleNormals;
 309       attr->Scissor = ctx->Scissor.Enabled;
 310       attr->Stencil = ctx->Stencil.Enabled;
 311       attr->StencilTwoSide = ctx->Stencil.TestTwoSide;
 312       attr->MultisampleEnabled = ctx->Multisample.Enabled;
 313       attr->SampleAlphaToCoverage = ctx->Multisample.SampleAlphaToCoverage;
 314       attr->SampleAlphaToOne = ctx->Multisample.SampleAlphaToOne;
 315       attr->SampleCoverage = ctx->Multisample.SampleCoverage;
 316       for (i = 0; i < ctx->Const.MaxTextureUnits; i++) {
 317          attr->Texture[i] = ctx->Texture.Unit[i].Enabled;
 318          attr->TexGen[i] = ctx->Texture.Unit[i].TexGenEnabled;
 319       }
 320       /* GL_NV_vertex_program */
 321       attr->VertexProgram = ctx->VertexProgram.Enabled;
 322       attr->VertexProgramPointSize = ctx->VertexProgram.PointSizeEnabled;
 323       attr->VertexProgramTwoSide = ctx->VertexProgram.TwoSideEnabled;
 324       save_attrib_data(&head, GL_ENABLE_BIT, attr);
 325    }
 326
 327    if (mask & GL_EVAL_BIT) {
 328       struct gl_eval_attrib *attr;
 329       attr = MALLOC_STRUCT( gl_eval_attrib );
 330       memcpy( attr, &ctx->Eval, sizeof(struct gl_eval_attrib) );
 331       save_attrib_data(&head, GL_EVAL_BIT, attr);
 332    }
 333
 334    if (mask & GL_FOG_BIT) {
 335       struct gl_fog_attrib *attr;
 336       attr = MALLOC_STRUCT( gl_fog_attrib );
 337       memcpy( attr, &ctx->Fog, sizeof(struct gl_fog_attrib) );
 338       save_attrib_data(&head, GL_FOG_BIT, attr);
 339    }
 340
 341    if (mask & GL_HINT_BIT) {
 342       struct gl_hint_attrib *attr;
 343       attr = MALLOC_STRUCT( gl_hint_attrib );
 344       memcpy( attr, &ctx->Hint, sizeof(struct gl_hint_attrib) );
 345       save_attrib_data(&head, GL_HINT_BIT, attr);
 346    }
 347
 348    if (mask & GL_LIGHTING_BIT) {
 349       struct gl_light_attrib *attr;
 350       FLUSH_CURRENT(ctx, 0);    /* flush material changes */
 351       attr = MALLOC_STRUCT( gl_light_attrib );
 352       memcpy( attr, &ctx->Light, sizeof(struct gl_light_attrib) );
 353       save_attrib_data(&head, GL_LIGHTING_BIT, attr);
 354    }
 355
 356    if (mask & GL_LINE_BIT) {
 357       struct gl_line_attrib *attr;
 358       attr = MALLOC_STRUCT( gl_line_attrib );
 359       memcpy( attr, &ctx->Line, sizeof(struct gl_line_attrib) );
 360       save_attrib_data(&head, GL_LINE_BIT, attr);
 361    }
 362
 363    if (mask & GL_LIST_BIT) {
 364       struct gl_list_attrib *attr;
 365       attr = MALLOC_STRUCT( gl_list_attrib );
 366       memcpy( attr, &ctx->List, sizeof(struct gl_list_attrib) );
 367       save_attrib_data(&head, GL_LIST_BIT, attr);
 368    }
 369
 370    if (mask & GL_PIXEL_MODE_BIT) {
 371       struct gl_pixel_attrib *attr;
 372       attr = MALLOC_STRUCT( gl_pixel_attrib );
 373       memcpy( attr, &ctx->Pixel, sizeof(struct gl_pixel_attrib) );
 374       /* push the Read FBO's ReadBuffer state, not ctx->Pixel.ReadBuffer */
 375       attr->ReadBuffer = ctx->ReadBuffer->ColorReadBuffer;
 376       save_attrib_data(&head, GL_PIXEL_MODE_BIT, attr);
 377    }
 378
 379    if (mask & GL_POINT_BIT) {
 380       struct gl_point_attrib *attr;
 381       attr = MALLOC_STRUCT( gl_point_attrib );
 382       memcpy( attr, &ctx->Point, sizeof(struct gl_point_attrib) );
 383       save_attrib_data(&head, GL_POINT_BIT, attr);
 384    }
 385
 386    if (mask & GL_POLYGON_BIT) {
 387       struct gl_polygon_attrib *attr;
 388       attr = MALLOC_STRUCT( gl_polygon_attrib );
 389       memcpy( attr, &ctx->Polygon, sizeof(struct gl_polygon_attrib) );
 390       save_attrib_data(&head, GL_POLYGON_BIT, attr);
 391    }
 392
 393    if (mask & GL_POLYGON_STIPPLE_BIT) {
 394       GLuint *stipple;
 395       stipple = (GLuint *) MALLOC( 32*sizeof(GLuint) );
 396       memcpy( stipple, ctx->PolygonStipple, 32*sizeof(GLuint) );
 397       save_attrib_data(&head, GL_POLYGON_STIPPLE_BIT, stipple);
 398    }
 399
 400    if (mask & GL_SCISSOR_BIT) {
 401       struct gl_scissor_attrib *attr;
 402       attr = MALLOC_STRUCT( gl_scissor_attrib );
 403       memcpy( attr, &ctx->Scissor, sizeof(struct gl_scissor_attrib) );
 404       save_attrib_data(&head, GL_SCISSOR_BIT, attr);
 405    }
 406
 407    if (mask & GL_STENCIL_BUFFER_BIT) {
 408       struct gl_stencil_attrib *attr;
 409       attr = MALLOC_STRUCT( gl_stencil_attrib );
 410       memcpy( attr, &ctx->Stencil, sizeof(struct gl_stencil_attrib) );
 411       save_attrib_data(&head, GL_STENCIL_BUFFER_BIT, attr);
 412    }
 413
 414    if (mask & GL_TEXTURE_BIT) {
 415       struct texture_state *texstate = CALLOC_STRUCT(texture_state);
 416       GLuint u, tex;
 417
 418       if (!texstate) {
 419          _mesa_error(ctx, GL_OUT_OF_MEMORY, "glPushAttrib(GL_TEXTURE_BIT)");
 420          goto end;
 421       }
 422
 423       _mesa_lock_context_textures(ctx);
 424
 425       /* copy/save the bulk of texture state here */
 426       memcpy(&texstate->Texture, &ctx->Texture, sizeof(ctx->Texture));
 427
 428       /* Save references to the currently bound texture objects so they don't
 429        * accidentally get deleted while referenced in the attribute stack.
 430        */
 431       for (u = 0; u < ctx->Const.MaxTextureUnits; u++) {
 432          for (tex = 0; tex < NUM_TEXTURE_TARGETS; tex++) {
 433             _mesa_reference_texobj(&texstate->SavedTexRef[u][tex],
 434                                    ctx->Texture.Unit[u].CurrentTex[tex]);
 435          }
 436       }
 437
 438       /* copy state/contents of the currently bound texture objects */
 439       for (u = 0; u < ctx->Const.MaxTextureUnits; u++) {
 440          for (tex = 0; tex < NUM_TEXTURE_TARGETS; tex++) {
 441             _mesa_copy_texture_object(&texstate->SavedObj[u][tex],
 442                                       ctx->Texture.Unit[u].CurrentTex[tex]);
 443          }
 444       }
 445
 446       _mesa_reference_shared_state(ctx, &texstate->SharedRef, ctx->Shared);
 447
 448       _mesa_unlock_context_textures(ctx);
 449
 450       save_attrib_data(&head, GL_TEXTURE_BIT, texstate);
 451    }
 452
 453    if (mask & GL_TRANSFORM_BIT) {
 454       struct gl_transform_attrib *attr;
 455       attr = MALLOC_STRUCT( gl_transform_attrib );
 456       memcpy( attr, &ctx->Transform, sizeof(struct gl_transform_attrib) );
 457       save_attrib_data(&head, GL_TRANSFORM_BIT, attr);
 458    }
 459
 460    if (mask & GL_VIEWPORT_BIT) {
 461       struct gl_viewport_attrib *attr;
 462       attr = MALLOC_STRUCT( gl_viewport_attrib );
 463       memcpy( attr, &ctx->Viewport, sizeof(struct gl_viewport_attrib) );
 464       save_attrib_data(&head, GL_VIEWPORT_BIT, attr);
 465    }
 466
 467    /* GL_ARB_multisample */
 468    if (mask & GL_MULTISAMPLE_BIT_ARB) {
 469       struct gl_multisample_attrib *attr;
 470       attr = MALLOC_STRUCT( gl_multisample_attrib );
 471       memcpy( attr, &ctx->Multisample, sizeof(struct gl_multisample_attrib) );
 472       save_attrib_data(&head, GL_MULTISAMPLE_BIT_ARB, attr);
 473    }
 474
 475 end:
 476    ctx->AttribStack[ctx->AttribStackDepth] = head;
 477    ctx->AttribStackDepth++;
 478 }
 479
 480
 481
 482 static void
 483 pop_enable_group(struct gl_context *ctx, const struct gl_enable_attrib *enable)
 484 {
 485    const GLuint curTexUnitSave = ctx->Texture.CurrentUnit;
 486    GLuint i;
 487
 488 #define TEST_AND_UPDATE(VALUE, NEWVALUE, ENUM)          \
 489         if ((VALUE) != (NEWVALUE)) {                    \
 490            _mesa_set_enable( ctx, ENUM, (NEWVALUE) );   \
 491         }
 492
 493    TEST_AND_UPDATE(ctx->Color.AlphaEnabled, enable->AlphaTest, GL_ALPHA_TEST);
 494    if (ctx->Color.BlendEnabled != enable->Blend) {
 495       if (ctx->Extensions.EXT_draw_buffers2) {
 496          GLuint i;
 497          for (i = 0; i < ctx->Const.MaxDrawBuffers; i++) {
 498             _mesa_set_enablei(ctx, GL_BLEND, i, (enable->Blend >> i) & 1);
 499          }
 500       }
 501       else {
 502          _mesa_set_enable(ctx, GL_BLEND, (enable->Blend & 1));
 503       }
 504    }
 505
 506    for (i=0;i<ctx->Const.MaxClipPlanes;i++) {
 507       const GLuint mask = 1 << i;
 508       if ((ctx->Transform.ClipPlanesEnabled & mask) != (enable->ClipPlanes & mask))
 509           _mesa_set_enable(ctx, (GLenum) (GL_CLIP_PLANE0 + i),
 510                            !!(enable->ClipPlanes & mask));
 511    }
 512
 513    TEST_AND_UPDATE(ctx->Light.ColorMaterialEnabled, enable->ColorMaterial,
 514                    GL_COLOR_MATERIAL);
 515    TEST_AND_UPDATE(ctx->Polygon.CullFlag, enable->CullFace, GL_CULL_FACE);
 516    TEST_AND_UPDATE(ctx->Transform.DepthClamp, enable->DepthClamp,
 517                    GL_DEPTH_CLAMP);
 518    TEST_AND_UPDATE(ctx->Depth.Test, enable->DepthTest, GL_DEPTH_TEST);
 519    TEST_AND_UPDATE(ctx->Color.DitherFlag, enable->Dither, GL_DITHER);
 520    TEST_AND_UPDATE(ctx->Fog.Enabled, enable->Fog, GL_FOG);
 521    TEST_AND_UPDATE(ctx->Light.Enabled, enable->Lighting, GL_LIGHTING);
 522    TEST_AND_UPDATE(ctx->Line.SmoothFlag, enable->LineSmooth, GL_LINE_SMOOTH);
 523    TEST_AND_UPDATE(ctx->Line.StippleFlag, enable->LineStipple,
 524                    GL_LINE_STIPPLE);
 525    TEST_AND_UPDATE(ctx->Color.IndexLogicOpEnabled, enable->IndexLogicOp,
 526                    GL_INDEX_LOGIC_OP);
 527    TEST_AND_UPDATE(ctx->Color.ColorLogicOpEnabled, enable->ColorLogicOp,
 528                    GL_COLOR_LOGIC_OP);
 529
 530    TEST_AND_UPDATE(ctx->Eval.Map1Color4, enable->Map1Color4, GL_MAP1_COLOR_4);
 531    TEST_AND_UPDATE(ctx->Eval.Map1Index, enable->Map1Index, GL_MAP1_INDEX);
 532    TEST_AND_UPDATE(ctx->Eval.Map1Normal, enable->Map1Normal, GL_MAP1_NORMAL);
 533    TEST_AND_UPDATE(ctx->Eval.Map1TextureCoord1, enable->Map1TextureCoord1,
 534                    GL_MAP1_TEXTURE_COORD_1);
 535    TEST_AND_UPDATE(ctx->Eval.Map1TextureCoord2, enable->Map1TextureCoord2,
 536                    GL_MAP1_TEXTURE_COORD_2);
 537    TEST_AND_UPDATE(ctx->Eval.Map1TextureCoord3, enable->Map1TextureCoord3,
 538                    GL_MAP1_TEXTURE_COORD_3);
 539    TEST_AND_UPDATE(ctx->Eval.Map1TextureCoord4, enable->Map1TextureCoord4,
 540                    GL_MAP1_TEXTURE_COORD_4);
 541    TEST_AND_UPDATE(ctx->Eval.Map1Vertex3, enable->Map1Vertex3,
 542                    GL_MAP1_VERTEX_3);
 543    TEST_AND_UPDATE(ctx->Eval.Map1Vertex4, enable->Map1Vertex4,
 544                    GL_MAP1_VERTEX_4);
 545    for (i = 0; i < 16; i++) {
 546       TEST_AND_UPDATE(ctx->Eval.Map1Attrib[i], enable->Map1Attrib[i],
 547                       GL_MAP1_VERTEX_ATTRIB0_4_NV + i);
 548    }
 549
 550    TEST_AND_UPDATE(ctx->Eval.Map2Color4, enable->Map2Color4, GL_MAP2_COLOR_4);
 551    TEST_AND_UPDATE(ctx->Eval.Map2Index, enable->Map2Index, GL_MAP2_INDEX);
 552    TEST_AND_UPDATE(ctx->Eval.Map2Normal, enable->Map2Normal, GL_MAP2_NORMAL);
 553    TEST_AND_UPDATE(ctx->Eval.Map2TextureCoord1, enable->Map2TextureCoord1,
 554                    GL_MAP2_TEXTURE_COORD_1);
 555    TEST_AND_UPDATE(ctx->Eval.Map2TextureCoord2, enable->Map2TextureCoord2,
 556                    GL_MAP2_TEXTURE_COORD_2);
 557    TEST_AND_UPDATE(ctx->Eval.Map2TextureCoord3, enable->Map2TextureCoord3,
 558                    GL_MAP2_TEXTURE_COORD_3);
 559    TEST_AND_UPDATE(ctx->Eval.Map2TextureCoord4, enable->Map2TextureCoord4,
 560                    GL_MAP2_TEXTURE_COORD_4);
 561    TEST_AND_UPDATE(ctx->Eval.Map2Vertex3, enable->Map2Vertex3,
 562                    GL_MAP2_VERTEX_3);
 563    TEST_AND_UPDATE(ctx->Eval.Map2Vertex4, enable->Map2Vertex4,
 564                    GL_MAP2_VERTEX_4);
 565    for (i = 0; i < 16; i++) {
 566       TEST_AND_UPDATE(ctx->Eval.Map2Attrib[i], enable->Map2Attrib[i],
 567                       GL_MAP2_VERTEX_ATTRIB0_4_NV + i);
 568    }
 569
 570    TEST_AND_UPDATE(ctx->Eval.AutoNormal, enable->AutoNormal, GL_AUTO_NORMAL);
 571    TEST_AND_UPDATE(ctx->Transform.Normalize, enable->Normalize, GL_NORMALIZE);
 572    TEST_AND_UPDATE(ctx->Transform.RescaleNormals, enable->RescaleNormals,
 573                    GL_RESCALE_NORMAL_EXT);
 574    TEST_AND_UPDATE(ctx->Transform.RasterPositionUnclipped,
 575                    enable->RasterPositionUnclipped,
 576                    GL_RASTER_POSITION_UNCLIPPED_IBM);
 577    TEST_AND_UPDATE(ctx->Point.SmoothFlag, enable->PointSmooth,
 578                    GL_POINT_SMOOTH);
 579    if (ctx->Extensions.NV_point_sprite || ctx->Extensions.ARB_point_sprite) {
 580       TEST_AND_UPDATE(ctx->Point.PointSprite, enable->PointSprite,
 581                       GL_POINT_SPRITE_NV);
 582    }
 583    TEST_AND_UPDATE(ctx->Polygon.OffsetPoint, enable->PolygonOffsetPoint,
 584                    GL_POLYGON_OFFSET_POINT);
 585    TEST_AND_UPDATE(ctx->Polygon.OffsetLine, enable->PolygonOffsetLine,
 586                    GL_POLYGON_OFFSET_LINE);
 587    TEST_AND_UPDATE(ctx->Polygon.OffsetFill, enable->PolygonOffsetFill,
 588                    GL_POLYGON_OFFSET_FILL);
 589    TEST_AND_UPDATE(ctx->Polygon.SmoothFlag, enable->PolygonSmooth,
 590                    GL_POLYGON_SMOOTH);
 591    TEST_AND_UPDATE(ctx->Polygon.StippleFlag, enable->PolygonStipple,
 592                    GL_POLYGON_STIPPLE);
 593    TEST_AND_UPDATE(ctx->Scissor.Enabled, enable->Scissor, GL_SCISSOR_TEST);
 594    TEST_AND_UPDATE(ctx->Stencil.Enabled, enable->Stencil, GL_STENCIL_TEST);
 595    if (ctx->Extensions.EXT_stencil_two_side) {
 596       TEST_AND_UPDATE(ctx->Stencil.TestTwoSide, enable->StencilTwoSide, GL_STENCIL_TEST_TWO_SIDE_EXT);
 597    }
 598    TEST_AND_UPDATE(ctx->Multisample.Enabled, enable->MultisampleEnabled,
 599                    GL_MULTISAMPLE_ARB);
 600    TEST_AND_UPDATE(ctx->Multisample.SampleAlphaToCoverage,
 601                    enable->SampleAlphaToCoverage,
 602                    GL_SAMPLE_ALPHA_TO_COVERAGE_ARB);
 603    TEST_AND_UPDATE(ctx->Multisample.SampleAlphaToOne,
 604                    enable->SampleAlphaToOne,
 605                    GL_SAMPLE_ALPHA_TO_ONE_ARB);
 606    TEST_AND_UPDATE(ctx->Multisample.SampleCoverage,
 607                    enable->SampleCoverage,
 608                    GL_SAMPLE_COVERAGE_ARB);
 609    /* GL_ARB_vertex_program, GL_NV_vertex_program */
 610    TEST_AND_UPDATE(ctx->VertexProgram.Enabled,
 611                    enable->VertexProgram,
 612                    GL_VERTEX_PROGRAM_ARB);
 613    TEST_AND_UPDATE(ctx->VertexProgram.PointSizeEnabled,
 614                    enable->VertexProgramPointSize,
 615                    GL_VERTEX_PROGRAM_POINT_SIZE_ARB);
 616    TEST_AND_UPDATE(ctx->VertexProgram.TwoSideEnabled,
 617                    enable->VertexProgramTwoSide,
 618                    GL_VERTEX_PROGRAM_TWO_SIDE_ARB);
 619
 620    /* texture unit enables */
 621    for (i = 0; i < ctx->Const.MaxTextureUnits; i++) {
 622       const GLbitfield enabled = enable->Texture[i];
 623       const GLbitfield genEnabled = enable->TexGen[i];
 624
 625       if (ctx->Texture.Unit[i].Enabled != enabled) {
 626          _mesa_ActiveTextureARB(GL_TEXTURE0 + i);
 627
 628          _mesa_set_enable(ctx, GL_TEXTURE_1D, !!(enabled & TEXTURE_1D_BIT));
 629          _mesa_set_enable(ctx, GL_TEXTURE_2D, !!(enabled & TEXTURE_2D_BIT));
 630          _mesa_set_enable(ctx, GL_TEXTURE_3D, !!(enabled & TEXTURE_3D_BIT));
 631          if (ctx->Extensions.NV_texture_rectangle) {
 632             _mesa_set_enable(ctx, GL_TEXTURE_RECTANGLE_ARB,
 633                              !!(enabled & TEXTURE_RECT_BIT));
 634          }
 635          if (ctx->Extensions.ARB_texture_cube_map) {
 636             _mesa_set_enable(ctx, GL_TEXTURE_CUBE_MAP,
 637                              !!(enabled & TEXTURE_CUBE_BIT));
 638          }
 639          if (ctx->Extensions.MESA_texture_array) {
 640             _mesa_set_enable(ctx, GL_TEXTURE_1D_ARRAY_EXT,
 641                              !!(enabled & TEXTURE_1D_ARRAY_BIT));
 642             _mesa_set_enable(ctx, GL_TEXTURE_2D_ARRAY_EXT,
 643                              !!(enabled & TEXTURE_2D_ARRAY_BIT));
 644          }
 645       }
 646
 647       if (ctx->Texture.Unit[i].TexGenEnabled != genEnabled) {
 648          _mesa_ActiveTextureARB(GL_TEXTURE0 + i);
 649          _mesa_set_enable(ctx, GL_TEXTURE_GEN_S, !!(genEnabled & S_BIT));
 650          _mesa_set_enable(ctx, GL_TEXTURE_GEN_T, !!(genEnabled & T_BIT));
 651          _mesa_set_enable(ctx, GL_TEXTURE_GEN_R, !!(genEnabled & R_BIT));
 652          _mesa_set_enable(ctx, GL_TEXTURE_GEN_Q, !!(genEnabled & Q_BIT));
 653       }
 654    }
 655
 656    _mesa_ActiveTextureARB(GL_TEXTURE0 + curTexUnitSave);
 657 }
 658
 659
 660 /**
 661  * Pop/restore texture attribute/group state.
 662  */
 663 static void
 664 pop_texture_group(struct gl_context *ctx, struct texture_state *texstate)
 665 {
 666    GLuint u;
 667
 668    _mesa_lock_context_textures(ctx);
 669
 670    for (u = 0; u < ctx->Const.MaxTextureUnits; u++) {
 671       const struct gl_texture_unit *unit = &texstate->Texture.Unit[u];
 672       GLuint tgt;
 673
 674       _mesa_ActiveTextureARB(GL_TEXTURE0_ARB + u);
 675       _mesa_set_enable(ctx, GL_TEXTURE_1D, !!(unit->Enabled & TEXTURE_1D_BIT));
 676       _mesa_set_enable(ctx, GL_TEXTURE_2D, !!(unit->Enabled & TEXTURE_2D_BIT));
 677       _mesa_set_enable(ctx, GL_TEXTURE_3D, !!(unit->Enabled & TEXTURE_3D_BIT));
 678       if (ctx->Extensions.ARB_texture_cube_map) {
 679          _mesa_set_enable(ctx, GL_TEXTURE_CUBE_MAP_ARB,
 680                           !!(unit->Enabled & TEXTURE_CUBE_BIT));
 681       }
 682       if (ctx->Extensions.NV_texture_rectangle) {
 683          _mesa_set_enable(ctx, GL_TEXTURE_RECTANGLE_NV,
 684                           !!(unit->Enabled & TEXTURE_RECT_BIT));
 685       }
 686       if (ctx->Extensions.MESA_texture_array) {
 687          _mesa_set_enable(ctx, GL_TEXTURE_1D_ARRAY_EXT,
 688                           !!(unit->Enabled & TEXTURE_1D_ARRAY_BIT));
 689          _mesa_set_enable(ctx, GL_TEXTURE_2D_ARRAY_EXT,
 690                           !!(unit->Enabled & TEXTURE_2D_ARRAY_BIT));
 691       }
 692
 693       _mesa_TexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, unit->EnvMode);
 694       _mesa_TexEnvfv(GL_TEXTURE_ENV, GL_TEXTURE_ENV_COLOR, unit->EnvColor);
 695       _mesa_TexGeni(GL_S, GL_TEXTURE_GEN_MODE, unit->GenS.Mode);
 696       _mesa_TexGeni(GL_T, GL_TEXTURE_GEN_MODE, unit->GenT.Mode);
 697       _mesa_TexGeni(GL_R, GL_TEXTURE_GEN_MODE, unit->GenR.Mode);
 698       _mesa_TexGeni(GL_Q, GL_TEXTURE_GEN_MODE, unit->GenQ.Mode);
 699       _mesa_TexGenfv(GL_S, GL_OBJECT_PLANE, unit->GenS.ObjectPlane);
 700       _mesa_TexGenfv(GL_T, GL_OBJECT_PLANE, unit->GenT.ObjectPlane);
 701       _mesa_TexGenfv(GL_R, GL_OBJECT_PLANE, unit->GenR.ObjectPlane);
 702       _mesa_TexGenfv(GL_Q, GL_OBJECT_PLANE, unit->GenQ.ObjectPlane);
 703       /* Eye plane done differently to avoid re-transformation */
 704       {
 705          struct gl_texture_unit *destUnit = &ctx->Texture.Unit[u];
 706          COPY_4FV(destUnit->GenS.EyePlane, unit->GenS.EyePlane);
 707          COPY_4FV(destUnit->GenT.EyePlane, unit->GenT.EyePlane);
 708          COPY_4FV(destUnit->GenR.EyePlane, unit->GenR.EyePlane);
 709          COPY_4FV(destUnit->GenQ.EyePlane, unit->GenQ.EyePlane);
 710          if (ctx->Driver.TexGen) {
 711             ctx->Driver.TexGen(ctx, GL_S, GL_EYE_PLANE, unit->GenS.EyePlane);
 712             ctx->Driver.TexGen(ctx, GL_T, GL_EYE_PLANE, unit->GenT.EyePlane);
 713             ctx->Driver.TexGen(ctx, GL_R, GL_EYE_PLANE, unit->GenR.EyePlane);
 714             ctx->Driver.TexGen(ctx, GL_Q, GL_EYE_PLANE, unit->GenQ.EyePlane);
 715          }
 716       }
 717       _mesa_set_enable(ctx, GL_TEXTURE_GEN_S, !!(unit->TexGenEnabled & S_BIT));
 718       _mesa_set_enable(ctx, GL_TEXTURE_GEN_T, !!(unit->TexGenEnabled & T_BIT));
 719       _mesa_set_enable(ctx, GL_TEXTURE_GEN_R, !!(unit->TexGenEnabled & R_BIT));
 720       _mesa_set_enable(ctx, GL_TEXTURE_GEN_Q, !!(unit->TexGenEnabled & Q_BIT));
 721       _mesa_TexEnvf(GL_TEXTURE_FILTER_CONTROL, GL_TEXTURE_LOD_BIAS,
 722                     unit->LodBias);
 723       _mesa_TexEnvi(GL_TEXTURE_ENV, GL_COMBINE_RGB,
 724                     unit->Combine.ModeRGB);
 725       _mesa_TexEnvi(GL_TEXTURE_ENV, GL_COMBINE_ALPHA,
 726                     unit->Combine.ModeA);
 727       {
 728          const GLuint n = ctx->Extensions.NV_texture_env_combine4 ? 4 : 3;
 729          GLuint i;
 730          for (i = 0; i < n; i++) {
 731             _mesa_TexEnvi(GL_TEXTURE_ENV, GL_SOURCE0_RGB + i,
 732                           unit->Combine.SourceRGB[i]);
 733             _mesa_TexEnvi(GL_TEXTURE_ENV, GL_SOURCE0_ALPHA + i,
 734                           unit->Combine.SourceA[i]);
 735             _mesa_TexEnvi(GL_TEXTURE_ENV, GL_OPERAND0_RGB + i,
 736                           unit->Combine.OperandRGB[i]);
 737             _mesa_TexEnvi(GL_TEXTURE_ENV, GL_OPERAND0_ALPHA + i,
 738                           unit->Combine.OperandA[i]);
 739          }
 740       }
 741       _mesa_TexEnvi(GL_TEXTURE_ENV, GL_RGB_SCALE,
 742                     1 << unit->Combine.ScaleShiftRGB);
 743       _mesa_TexEnvi(GL_TEXTURE_ENV, GL_ALPHA_SCALE,
 744                     1 << unit->Combine.ScaleShiftA);
 745
 746       /* Restore texture object state for each target */
 747       for (tgt = 0; tgt < NUM_TEXTURE_TARGETS; tgt++) {
 748          const struct gl_texture_object *obj = NULL;
 749          const struct gl_sampler_object *samp;
 750          GLenum target;
 751
 752          obj = &texstate->SavedObj[u][tgt];
 753
 754          /* don't restore state for unsupported targets to prevent
 755           * raising GL errors.
 756           */
 757          if (obj->Target == GL_TEXTURE_CUBE_MAP_ARB &&
 758              !ctx->Extensions.ARB_texture_cube_map) {
 759             continue;
 760          }
 761          else if (obj->Target == GL_TEXTURE_RECTANGLE_NV &&
 762                   !ctx->Extensions.NV_texture_rectangle) {
 763             continue;
 764          }
 765          else if ((obj->Target == GL_TEXTURE_1D_ARRAY_EXT ||
 766                    obj->Target == GL_TEXTURE_2D_ARRAY_EXT) &&
 767                   !ctx->Extensions.MESA_texture_array) {
 768             continue;
 769          }
 770          else if (obj->Target == GL_TEXTURE_BUFFER)
 771             continue;
 772          else if (obj->Target == GL_TEXTURE_EXTERNAL_OES)
 773             continue;
 774
 775          target = obj->Target;
 776
 777          _mesa_BindTexture(target, obj->Name);
 778
 779          samp = &obj->Sampler;
 780
 781          _mesa_TexParameterfv(target, GL_TEXTURE_BORDER_COLOR, samp->BorderColor.f);
 782          _mesa_TexParameteri(target, GL_TEXTURE_WRAP_S, samp->WrapS);
 783          _mesa_TexParameteri(target, GL_TEXTURE_WRAP_T, samp->WrapT);
 784          _mesa_TexParameteri(target, GL_TEXTURE_WRAP_R, samp->WrapR);
 785          _mesa_TexParameteri(target, GL_TEXTURE_MIN_FILTER, samp->MinFilter);
 786          _mesa_TexParameteri(target, GL_TEXTURE_MAG_FILTER, samp->MagFilter);
 787          _mesa_TexParameterf(target, GL_TEXTURE_MIN_LOD, samp->MinLod);
 788          _mesa_TexParameterf(target, GL_TEXTURE_MAX_LOD, samp->MaxLod);
 789          _mesa_TexParameterf(target, GL_TEXTURE_LOD_BIAS, samp->LodBias);
 790          _mesa_TexParameterf(target, GL_TEXTURE_PRIORITY, obj->Priority);
 791          _mesa_TexParameteri(target, GL_TEXTURE_BASE_LEVEL, obj->BaseLevel);
 792          if (target != GL_TEXTURE_RECTANGLE_ARB)
 793             _mesa_TexParameteri(target, GL_TEXTURE_MAX_LEVEL, obj->MaxLevel);
 794          if (ctx->Extensions.EXT_texture_filter_anisotropic) {
 795             _mesa_TexParameterf(target, GL_TEXTURE_MAX_ANISOTROPY_EXT,
 796                                 samp->MaxAnisotropy);
 797          }
 798          if (ctx->Extensions.ARB_shadow_ambient) {
 799             _mesa_TexParameterf(target, GL_TEXTURE_COMPARE_FAIL_VALUE_ARB,
 800                                 samp->CompareFailValue);
 801          }
 802          if (ctx->Extensions.ARB_shadow) {
 803             _mesa_TexParameteri(target, GL_TEXTURE_COMPARE_MODE,
 804                                 samp->CompareMode);
 805             _mesa_TexParameteri(target, GL_TEXTURE_COMPARE_FUNC,
 806                                 samp->CompareFunc);
 807          }
 808          if (ctx->Extensions.ARB_depth_texture)
 809             _mesa_TexParameteri(target, GL_DEPTH_TEXTURE_MODE, obj->DepthMode);
 810       }
 811
 812       /* remove saved references to the texture objects */
 813       for (tgt = 0; tgt < NUM_TEXTURE_TARGETS; tgt++) {
 814          _mesa_reference_texobj(&texstate->SavedTexRef[u][tgt], NULL);
 815       }
 816    }
 817
 818    _mesa_ActiveTextureARB(GL_TEXTURE0_ARB + texstate->Texture.CurrentUnit);
 819
 820    _mesa_reference_shared_state(ctx, &texstate->SharedRef, NULL);
 821
 822    _mesa_unlock_context_textures(ctx);
 823 }
 824
 825
 826 /*
 827  * This function is kind of long just because we have to call a lot
 828  * of device driver functions to update device driver state.
 829  *
 830  * XXX As it is now, most of the pop-code calls immediate-mode Mesa functions
 831  * in order to restore GL state.  This isn't terribly efficient but it
 832  * ensures that dirty flags and any derived state gets updated correctly.
 833  * We could at least check if the value to restore equals the current value
 834  * and then skip the Mesa call.
 835  */
 836 void GLAPIENTRY
 837 _mesa_PopAttrib(void)
 838 {
 839    struct gl_attrib_node *attr, *next;
 840    GET_CURRENT_CONTEXT(ctx);
 841    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
 842
 843    if (ctx->AttribStackDepth == 0) {
 844       _mesa_error( ctx, GL_STACK_UNDERFLOW, "glPopAttrib" );
 845       return;
 846    }
 847
 848    ctx->AttribStackDepth--;
 849    attr = ctx->AttribStack[ctx->AttribStackDepth];
 850
 851    while (attr) {
 852
 853       if (MESA_VERBOSE & VERBOSE_API) {
 854          _mesa_debug(ctx, "glPopAttrib %s\n",
 855                      _mesa_lookup_enum_by_nr(attr->kind));
 856       }
 857
 858       switch (attr->kind) {
 859          case GL_ACCUM_BUFFER_BIT:
 860             {
 861                const struct gl_accum_attrib *accum;
 862                accum = (const struct gl_accum_attrib *) attr->data;
 863                _mesa_ClearAccum(accum->ClearColor[0],
 864                                 accum->ClearColor[1],
 865                                 accum->ClearColor[2],
 866                                 accum->ClearColor[3]);
 867             }
 868             break;
 869          case GL_COLOR_BUFFER_BIT:
 870             {
 871                const struct gl_colorbuffer_attrib *color;
 872
 873                color = (const struct gl_colorbuffer_attrib *) attr->data;
 874                _mesa_ClearIndex((GLfloat) color->ClearIndex);
 875                _mesa_ClearColor(color->ClearColor.f[0],
 876                                 color->ClearColor.f[1],
 877                                 color->ClearColor.f[2],
 878                                 color->ClearColor.f[3]);
 879                _mesa_IndexMask(color->IndexMask);
 880                if (!ctx->Extensions.EXT_draw_buffers2) {
 881                   _mesa_ColorMask((GLboolean) (color->ColorMask[0][0] != 0),
 882                                   (GLboolean) (color->ColorMask[0][1] != 0),
 883                                   (GLboolean) (color->ColorMask[0][2] != 0),
 884                                   (GLboolean) (color->ColorMask[0][3] != 0));
 885                }
 886                else {
 887                   GLuint i;
 888                   for (i = 0; i < ctx->Const.MaxDrawBuffers; i++) {
 889                      _mesa_ColorMaskIndexed(i,
 890                                   (GLboolean) (color->ColorMask[i][0] != 0),
 891                                   (GLboolean) (color->ColorMask[i][1] != 0),
 892                                   (GLboolean) (color->ColorMask[i][2] != 0),
 893                                   (GLboolean) (color->ColorMask[i][3] != 0));
 894                   }
 895                }
 896                {
 897                   /* Need to determine if more than one color output is
 898                    * specified.  If so, call glDrawBuffersARB, else call
 899                    * glDrawBuffer().  This is a subtle, but essential point
 900                    * since GL_FRONT (for example) is illegal for the former
 901                    * function, but legal for the later.
 902                    */
 903                   GLboolean multipleBuffers = GL_FALSE;
 904                   GLuint i;
 905
 906                   for (i = 1; i < ctx->Const.MaxDrawBuffers; i++) {
 907                      if (color->DrawBuffer[i] != GL_NONE) {
 908                         multipleBuffers = GL_TRUE;
 909                         break;
 910                      }
 911                   }
 912                   /* Call the API_level functions, not _mesa_drawbuffers()
 913                    * since we need to do error checking on the pop'd
 914                    * GL_DRAW_BUFFER.
 915                    * Ex: if GL_FRONT were pushed, but we're popping with a
 916                    * user FBO bound, GL_FRONT will be illegal and we'll need
 917                    * to record that error.  Per OpenGL ARB decision.
 918                    */
 919                   if (multipleBuffers)
 920                      _mesa_DrawBuffersARB(ctx->Const.MaxDrawBuffers,
 921                                           color->DrawBuffer);
 922                   else
 923                      _mesa_DrawBuffer(color->DrawBuffer[0]);
 924                }
 925                _mesa_set_enable(ctx, GL_ALPHA_TEST, color->AlphaEnabled);
 926                _mesa_AlphaFunc(color->AlphaFunc, color->AlphaRefUnclamped);
 927                if (ctx->Color.BlendEnabled != color->BlendEnabled) {
 928                   if (ctx->Extensions.EXT_draw_buffers2) {
 929                      GLuint i;
 930                      for (i = 0; i < ctx->Const.MaxDrawBuffers; i++) {
 931                         _mesa_set_enablei(ctx, GL_BLEND, i,
 932                                           (color->BlendEnabled >> i) & 1);
 933                      }
 934                   }
 935                   else {
 936                      _mesa_set_enable(ctx, GL_BLEND, (color->BlendEnabled & 1));
 937                   }
 938                }
 939                if (ctx->Color._BlendFuncPerBuffer ||
 940                    ctx->Color._BlendEquationPerBuffer) {
 941                   /* set blend per buffer */
 942                   GLuint buf;
 943                   for (buf = 0; buf < ctx->Const.MaxDrawBuffers; buf++) {
 944                      _mesa_BlendFuncSeparatei(buf, color->Blend[buf].SrcRGB,
 945                                               color->Blend[buf].DstRGB,
 946                                               color->Blend[buf].SrcA,
 947                                               color->Blend[buf].DstA);
 948                      _mesa_BlendEquationSeparatei(buf,
 949                                                   color->Blend[buf].EquationRGB,
 950                                                   color->Blend[buf].EquationA);
 951                   }
 952                }
 953                else {
 954                   /* set same blend modes for all buffers */
 955                   _mesa_BlendFuncSeparateEXT(color->Blend[0].SrcRGB,
 956                                              color->Blend[0].DstRGB,
 957                                              color->Blend[0].SrcA,
 958                                              color->Blend[0].DstA);
 959                   /* This special case is because glBlendEquationSeparateEXT
 960                    * cannot take GL_LOGIC_OP as a parameter.
 961                    */
 962                   if (color->Blend[0].EquationRGB ==
 963                       color->Blend[0].EquationA) {
 964                      _mesa_BlendEquation(color->Blend[0].EquationRGB);
 965                   }
 966                   else {
 967                      _mesa_BlendEquationSeparateEXT(
 968                                                  color->Blend[0].EquationRGB,
 969                                                  color->Blend[0].EquationA);
 970                   }
 971                }
 972                _mesa_BlendColor(color->BlendColorUnclamped[0],
 973                                 color->BlendColorUnclamped[1],
 974                                 color->BlendColorUnclamped[2],
 975                                 color->BlendColorUnclamped[3]);
 976                _mesa_LogicOp(color->LogicOp);
 977                _mesa_set_enable(ctx, GL_COLOR_LOGIC_OP,
 978                                 color->ColorLogicOpEnabled);
 979                _mesa_set_enable(ctx, GL_INDEX_LOGIC_OP,
 980                                 color->IndexLogicOpEnabled);
 981                _mesa_set_enable(ctx, GL_DITHER, color->DitherFlag);
 982                _mesa_ClampColorARB(GL_CLAMP_FRAGMENT_COLOR_ARB, color->ClampFragmentColor);
 983                _mesa_ClampColorARB(GL_CLAMP_READ_COLOR_ARB, color->ClampReadColor);
 984             }
 985             break;
 986          case GL_CURRENT_BIT:
 987             FLUSH_CURRENT( ctx, 0 );
 988             memcpy( &ctx->Current, attr->data,
 989                     sizeof(struct gl_current_attrib) );
 990             break;
 991          case GL_DEPTH_BUFFER_BIT:
 992             {
 993                const struct gl_depthbuffer_attrib *depth;
 994                depth = (const struct gl_depthbuffer_attrib *) attr->data;
 995                _mesa_DepthFunc(depth->Func);
 996                _mesa_ClearDepth(depth->Clear);
 997                _mesa_set_enable(ctx, GL_DEPTH_TEST, depth->Test);
 998                _mesa_DepthMask(depth->Mask);
 999             }
1000             break;
1001          case GL_ENABLE_BIT:
1002             {
1003                const struct gl_enable_attrib *enable;
1004                enable = (const struct gl_enable_attrib *) attr->data;
1005                pop_enable_group(ctx, enable);
1006                ctx->NewState |= _NEW_ALL;
1007             }
1008             break;
1009          case GL_EVAL_BIT:
1010             memcpy( &ctx->Eval, attr->data, sizeof(struct gl_eval_attrib) );
1011             ctx->NewState |= _NEW_EVAL;
1012             break;
1013          case GL_FOG_BIT:
1014             {
1015                const struct gl_fog_attrib *fog;
1016                fog = (const struct gl_fog_attrib *) attr->data;
1017                _mesa_set_enable(ctx, GL_FOG, fog->Enabled);
1018                _mesa_Fogfv(GL_FOG_COLOR, fog->Color);
1019                _mesa_Fogf(GL_FOG_DENSITY, fog->Density);
1020                _mesa_Fogf(GL_FOG_START, fog->Start);
1021                _mesa_Fogf(GL_FOG_END, fog->End);
1022                _mesa_Fogf(GL_FOG_INDEX, fog->Index);
1023                _mesa_Fogi(GL_FOG_MODE, fog->Mode);
1024             }
1025             break;
1026          case GL_HINT_BIT:
1027             {
1028                const struct gl_hint_attrib *hint;
1029                hint = (const struct gl_hint_attrib *) attr->data;
1030                _mesa_Hint(GL_PERSPECTIVE_CORRECTION_HINT,
1031                           hint->PerspectiveCorrection );
1032                _mesa_Hint(GL_POINT_SMOOTH_HINT, hint->PointSmooth);
1033                _mesa_Hint(GL_LINE_SMOOTH_HINT, hint->LineSmooth);
1034                _mesa_Hint(GL_POLYGON_SMOOTH_HINT, hint->PolygonSmooth);
1035                _mesa_Hint(GL_FOG_HINT, hint->Fog);
1036                _mesa_Hint(GL_CLIP_VOLUME_CLIPPING_HINT_EXT,
1037                           hint->ClipVolumeClipping);
1038                _mesa_Hint(GL_TEXTURE_COMPRESSION_HINT_ARB,
1039                           hint->TextureCompression);
1040             }
1041             break;
1042          case GL_LIGHTING_BIT:
1043             {
1044                GLuint i;
1045                const struct gl_light_attrib *light;
1046                light = (const struct gl_light_attrib *) attr->data;
1047                /* lighting enable */
1048                _mesa_set_enable(ctx, GL_LIGHTING, light->Enabled);
1049                /* per-light state */
1050                if (_math_matrix_is_dirty(ctx->ModelviewMatrixStack.Top))
1051                   _math_matrix_analyse( ctx->ModelviewMatrixStack.Top );
1052
1053                for (i = 0; i < ctx->Const.MaxLights; i++) {
1054                   const struct gl_light *l = &light->Light[i];
1055                   _mesa_set_enable(ctx, GL_LIGHT0 + i, l->Enabled);
1056                   _mesa_light(ctx, i, GL_AMBIENT, l->Ambient);
1057                   _mesa_light(ctx, i, GL_DIFFUSE, l->Diffuse);
1058                   _mesa_light(ctx, i, GL_SPECULAR, l->Specular );
1059                   _mesa_light(ctx, i, GL_POSITION, l->EyePosition);
1060                   _mesa_light(ctx, i, GL_SPOT_DIRECTION, l->SpotDirection);
1061                   {
1062                      GLfloat p[4] = { 0 };
1063                      p[0] = l->SpotExponent;
1064                      _mesa_light(ctx, i, GL_SPOT_EXPONENT, p);
1065                   }
1066                   {
1067                      GLfloat p[4] = { 0 };
1068                      p[0] = l->SpotCutoff;
1069                      _mesa_light(ctx, i, GL_SPOT_CUTOFF, p);
1070                   }
1071                   {
1072                      GLfloat p[4] = { 0 };
1073                      p[0] = l->ConstantAttenuation;
1074                      _mesa_light(ctx, i, GL_CONSTANT_ATTENUATION, p);
1075                   }
1076                   {
1077                      GLfloat p[4] = { 0 };
1078                      p[0] = l->LinearAttenuation;
1079                      _mesa_light(ctx, i, GL_LINEAR_ATTENUATION, p);
1080                   }
1081                   {
1082                      GLfloat p[4] = { 0 };
1083                      p[0] = l->QuadraticAttenuation;
1084                      _mesa_light(ctx, i, GL_QUADRATIC_ATTENUATION, p);
1085                   }
1086                }
1087                /* light model */
1088                _mesa_LightModelfv(GL_LIGHT_MODEL_AMBIENT,
1089                                   light->Model.Ambient);
1090                _mesa_LightModelf(GL_LIGHT_MODEL_LOCAL_VIEWER,
1091                                  (GLfloat) light->Model.LocalViewer);
1092                _mesa_LightModelf(GL_LIGHT_MODEL_TWO_SIDE,
1093                                  (GLfloat) light->Model.TwoSide);
1094                _mesa_LightModelf(GL_LIGHT_MODEL_COLOR_CONTROL,
1095                                  (GLfloat) light->Model.ColorControl);
1096                /* shade model */
1097                _mesa_ShadeModel(light->ShadeModel);
1098                /* color material */
1099                _mesa_ColorMaterial(light->ColorMaterialFace,
1100                                    light->ColorMaterialMode);
1101                _mesa_set_enable(ctx, GL_COLOR_MATERIAL,
1102                                 light->ColorMaterialEnabled);
1103                /* materials */
1104                memcpy(&ctx->Light.Material, &light->Material,
1105                       sizeof(struct gl_material));
1106                _mesa_ClampColorARB(GL_CLAMP_VERTEX_COLOR_ARB, light->ClampVertexColor);
1107             }
1108             break;
1109          case GL_LINE_BIT:
1110             {
1111                const struct gl_line_attrib *line;
1112                line = (const struct gl_line_attrib *) attr->data;
1113                _mesa_set_enable(ctx, GL_LINE_SMOOTH, line->SmoothFlag);
1114                _mesa_set_enable(ctx, GL_LINE_STIPPLE, line->StippleFlag);
1115                _mesa_LineStipple(line->StippleFactor, line->StipplePattern);
1116                _mesa_LineWidth(line->Width);
1117             }
1118             break;
1119          case GL_LIST_BIT:
1120             memcpy( &ctx->List, attr->data, sizeof(struct gl_list_attrib) );
1121             break;
1122          case GL_PIXEL_MODE_BIT:
1123             memcpy( &ctx->Pixel, attr->data, sizeof(struct gl_pixel_attrib) );
1124             /* XXX what other pixel state needs to be set by function calls? */
1125             _mesa_ReadBuffer(ctx->Pixel.ReadBuffer);
1126             ctx->NewState |= _NEW_PIXEL;
1127             break;
1128          case GL_POINT_BIT:
1129             {
1130                const struct gl_point_attrib *point;
1131                point = (const struct gl_point_attrib *) attr->data;
1132                _mesa_PointSize(point->Size);
1133                _mesa_set_enable(ctx, GL_POINT_SMOOTH, point->SmoothFlag);
1134                if (ctx->Extensions.EXT_point_parameters) {
1135                   _mesa_PointParameterfv(GL_DISTANCE_ATTENUATION_EXT,
1136                                          point->Params);
1137                   _mesa_PointParameterf(GL_POINT_SIZE_MIN_EXT,
1138                                         point->MinSize);
1139                   _mesa_PointParameterf(GL_POINT_SIZE_MAX_EXT,
1140                                         point->MaxSize);
1141                   _mesa_PointParameterf(GL_POINT_FADE_THRESHOLD_SIZE_EXT,
1142                                         point->Threshold);
1143                }
1144                if (ctx->Extensions.NV_point_sprite
1145                    || ctx->Extensions.ARB_point_sprite) {
1146                   GLuint u;
1147                   for (u = 0; u < ctx->Const.MaxTextureUnits; u++) {
1148                      _mesa_TexEnvi(GL_POINT_SPRITE_NV, GL_COORD_REPLACE_NV,
1149                                    (GLint) point->CoordReplace[u]);
1150                   }
1151                   _mesa_set_enable(ctx, GL_POINT_SPRITE_NV,point->PointSprite);
1152                   if (ctx->Extensions.NV_point_sprite)
1153                      _mesa_PointParameteri(GL_POINT_SPRITE_R_MODE_NV,
1154                                            ctx->Point.SpriteRMode);
1155                   _mesa_PointParameterf(GL_POINT_SPRITE_COORD_ORIGIN,
1156                                         (GLfloat)ctx->Point.SpriteOrigin);
1157                }
1158             }
1159             break;
1160          case GL_POLYGON_BIT:
1161             {
1162                const struct gl_polygon_attrib *polygon;
1163                polygon = (const struct gl_polygon_attrib *) attr->data;
1164                _mesa_CullFace(polygon->CullFaceMode);
1165                _mesa_FrontFace(polygon->FrontFace);
1166                _mesa_PolygonMode(GL_FRONT, polygon->FrontMode);
1167                _mesa_PolygonMode(GL_BACK, polygon->BackMode);
1168                _mesa_PolygonOffset(polygon->OffsetFactor,
1169                                    polygon->OffsetUnits);
1170                _mesa_set_enable(ctx, GL_POLYGON_SMOOTH, polygon->SmoothFlag);
1171                _mesa_set_enable(ctx, GL_POLYGON_STIPPLE, polygon->StippleFlag);
1172                _mesa_set_enable(ctx, GL_CULL_FACE, polygon->CullFlag);
1173                _mesa_set_enable(ctx, GL_POLYGON_OFFSET_POINT,
1174                                 polygon->OffsetPoint);
1175                _mesa_set_enable(ctx, GL_POLYGON_OFFSET_LINE,
1176                                 polygon->OffsetLine);
1177                _mesa_set_enable(ctx, GL_POLYGON_OFFSET_FILL,
1178                                 polygon->OffsetFill);
1179             }
1180             break;
1181          case GL_POLYGON_STIPPLE_BIT:
1182             memcpy( ctx->PolygonStipple, attr->data, 32*sizeof(GLuint) );
1183             ctx->NewState |= _NEW_POLYGONSTIPPLE;
1184             if (ctx->Driver.PolygonStipple)
1185                ctx->Driver.PolygonStipple( ctx, (const GLubyte *) attr->data );
1186             break;
1187          case GL_SCISSOR_BIT:
1188             {
1189                const struct gl_scissor_attrib *scissor;
1190                scissor = (const struct gl_scissor_attrib *) attr->data;
1191                _mesa_Scissor(scissor->X, scissor->Y,
1192                              scissor->Width, scissor->Height);
1193                _mesa_set_enable(ctx, GL_SCISSOR_TEST, scissor->Enabled);
1194             }
1195             break;
1196          case GL_STENCIL_BUFFER_BIT:
1197             {
1198                const struct gl_stencil_attrib *stencil;
1199                stencil = (const struct gl_stencil_attrib *) attr->data;
1200                _mesa_set_enable(ctx, GL_STENCIL_TEST, stencil->Enabled);
1201                _mesa_ClearStencil(stencil->Clear);
1202                if (ctx->Extensions.EXT_stencil_two_side) {
1203                   _mesa_set_enable(ctx, GL_STENCIL_TEST_TWO_SIDE_EXT,
1204                                    stencil->TestTwoSide);
1205                   _mesa_ActiveStencilFaceEXT(stencil->ActiveFace
1206                                              ? GL_BACK : GL_FRONT);
1207                }
1208                /* front state */
1209                _mesa_StencilFuncSeparate(GL_FRONT,
1210                                          stencil->Function[0],
1211                                          stencil->Ref[0],
1212                                          stencil->ValueMask[0]);
1213                _mesa_StencilMaskSeparate(GL_FRONT, stencil->WriteMask[0]);
1214                _mesa_StencilOpSeparate(GL_FRONT, stencil->FailFunc[0],
1215                                        stencil->ZFailFunc[0],
1216                                        stencil->ZPassFunc[0]);
1217                /* back state */
1218                _mesa_StencilFuncSeparate(GL_BACK,
1219                                          stencil->Function[1],
1220                                          stencil->Ref[1],
1221                                          stencil->ValueMask[1]);
1222                _mesa_StencilMaskSeparate(GL_BACK, stencil->WriteMask[1]);
1223                _mesa_StencilOpSeparate(GL_BACK, stencil->FailFunc[1],
1224                                        stencil->ZFailFunc[1],
1225                                        stencil->ZPassFunc[1]);
1226             }
1227             break;
1228          case GL_TRANSFORM_BIT:
1229             {
1230                GLuint i;
1231                const struct gl_transform_attrib *xform;
1232                xform = (const struct gl_transform_attrib *) attr->data;
1233                _mesa_MatrixMode(xform->MatrixMode);
1234                if (_math_matrix_is_dirty(ctx->ProjectionMatrixStack.Top))
1235                   _math_matrix_analyse( ctx->ProjectionMatrixStack.Top );
1236
1237                /* restore clip planes */
1238                for (i = 0; i < ctx->Const.MaxClipPlanes; i++) {
1239                   const GLuint mask = 1 << i;
1240                   const GLfloat *eyePlane = xform->EyeUserPlane[i];
1241                   COPY_4V(ctx->Transform.EyeUserPlane[i], eyePlane);
1242                   _mesa_set_enable(ctx, GL_CLIP_PLANE0 + i,
1243                                    !!(xform->ClipPlanesEnabled & mask));
1244                   if (ctx->Driver.ClipPlane)
1245                      ctx->Driver.ClipPlane( ctx, GL_CLIP_PLANE0 + i, eyePlane );
1246                }
1247
1248                /* normalize/rescale */
1249                if (xform->Normalize != ctx->Transform.Normalize)
1250                   _mesa_set_enable(ctx, GL_NORMALIZE,ctx->Transform.Normalize);
1251                if (xform->RescaleNormals != ctx->Transform.RescaleNormals)
1252                   _mesa_set_enable(ctx, GL_RESCALE_NORMAL_EXT,
1253                                    ctx->Transform.RescaleNormals);
1254                if (xform->DepthClamp != ctx->Transform.DepthClamp)
1255                   _mesa_set_enable(ctx, GL_DEPTH_CLAMP,
1256                                    ctx->Transform.DepthClamp);
1257             }
1258             break;
1259          case GL_TEXTURE_BIT:
1260             {
1261                struct texture_state *texstate
1262                   = (struct texture_state *) attr->data;
1263                pop_texture_group(ctx, texstate);
1264                ctx->NewState |= _NEW_TEXTURE;
1265             }
1266             break;
1267          case GL_VIEWPORT_BIT:
1268             {
1269                const struct gl_viewport_attrib *vp;
1270                vp = (const struct gl_viewport_attrib *) attr->data;
1271                _mesa_Viewport(vp->X, vp->Y, vp->Width, vp->Height);
1272                _mesa_DepthRange(vp->Near, vp->Far);
1273             }
1274             break;
1275          case GL_MULTISAMPLE_BIT_ARB:
1276             {
1277                const struct gl_multisample_attrib *ms;
1278                ms = (const struct gl_multisample_attrib *) attr->data;
1279
1280                TEST_AND_UPDATE(ctx->Multisample.Enabled,
1281                                ms->Enabled,
1282                                GL_MULTISAMPLE);
1283
1284                TEST_AND_UPDATE(ctx->Multisample.SampleCoverage,
1285                                ms->SampleCoverage,
1286                                GL_SAMPLE_COVERAGE);
1287
1288                TEST_AND_UPDATE(ctx->Multisample.SampleAlphaToCoverage,
1289                                ms->SampleAlphaToCoverage,
1290                                GL_SAMPLE_ALPHA_TO_COVERAGE);
1291
1292                TEST_AND_UPDATE(ctx->Multisample.SampleAlphaToOne,
1293                                ms->SampleAlphaToOne,
1294                                GL_SAMPLE_ALPHA_TO_ONE);
1295
1296                _mesa_SampleCoverageARB(ms->SampleCoverageValue,
1297                                        ms->SampleCoverageInvert);
1298             }
1299             break;
1300
1301          default:
1302             _mesa_problem( ctx, "Bad attrib flag in PopAttrib");
1303             break;
1304       }
1305
1306       next = attr->next;
1307       FREE( attr->data );
1308       FREE( attr );
1309       attr = next;
1310    }
1311 }
1312
1313
1314 /**
1315  * Copy gl_pixelstore_attrib from src to dst, updating buffer
1316  * object refcounts.
1317  */
1318 static void
1319 copy_pixelstore(struct gl_context *ctx,
1320                 struct gl_pixelstore_attrib *dst,
1321                 const struct gl_pixelstore_attrib *src)
1322 {
1323    dst->Alignment = src->Alignment;
1324    dst->RowLength = src->RowLength;
1325    dst->SkipPixels = src->SkipPixels;
1326    dst->SkipRows = src->SkipRows;
1327    dst->ImageHeight = src->ImageHeight;
1328    dst->SkipImages = src->SkipImages;
1329    dst->SwapBytes = src->SwapBytes;
1330    dst->LsbFirst = src->LsbFirst;
1331    dst->Invert = src->Invert;
1332    _mesa_reference_buffer_object(ctx, &dst->BufferObj, src->BufferObj);
1333 }
1334
1335
1336 #define GL_CLIENT_PACK_BIT (1<<20)
1337 #define GL_CLIENT_UNPACK_BIT (1<<21)
1338
1339 /**
1340  * Copy gl_array_object from src to dest.
1341  * 'dest' must be in an initialized state.
1342  */
1343 static void
1344 copy_array_object(struct gl_context *ctx,
1345                   struct gl_array_object *dest,
1346                   struct gl_array_object *src)
1347 {
1348    GLuint i;
1349
1350    /* skip Name */
1351    /* skip RefCount */
1352
1353    /* In theory must be the same anyway, but on recreate make sure it matches */
1354    dest->ARBsemantics = src->ARBsemantics;
1355
1356    for (i = 0; i < Elements(src->VertexAttrib); i++)
1357       _mesa_copy_client_array(ctx, &dest->VertexAttrib[i], &src->VertexAttrib[i]);
1358
1359    /* _Enabled must be the same than on push */
1360    dest->_Enabled = src->_Enabled;
1361    dest->_MaxElement = src->_MaxElement;
1362 }
1363
1364 /**
1365  * Copy gl_array_attrib from src to dest.
1366  * 'dest' must be in an initialized state.
1367  */
1368 static void
1369 copy_array_attrib(struct gl_context *ctx,
1370                   struct gl_array_attrib *dest,
1371                   struct gl_array_attrib *src,
1372                   bool vbo_deleted)
1373 {
1374    /* skip ArrayObj */
1375    /* skip DefaultArrayObj, Objects */
1376    dest->ActiveTexture = src->ActiveTexture;
1377    dest->LockFirst = src->LockFirst;
1378    dest->LockCount = src->LockCount;
1379    dest->PrimitiveRestart = src->PrimitiveRestart;
1380    dest->RestartIndex = src->RestartIndex;
1381    /* skip NewState */
1382    /* skip RebindArrays */
1383
1384    if (!vbo_deleted)
1385       copy_array_object(ctx, dest->ArrayObj, src->ArrayObj);
1386
1387    /* skip ArrayBufferObj */
1388    /* skip ElementArrayBufferObj */
1389 }
1390
1391 /**
1392  * Save the content of src to dest.
1393  */
1394 static void
1395 save_array_attrib(struct gl_context *ctx,
1396                   struct gl_array_attrib *dest,
1397                   struct gl_array_attrib *src)
1398 {
1399    /* Set the Name, needed for restore, but do never overwrite.
1400     * Needs to match value in the object hash. */
1401    dest->ArrayObj->Name = src->ArrayObj->Name;
1402    /* And copy all of the rest. */
1403    copy_array_attrib(ctx, dest, src, false);
1404
1405    /* Just reference them here */
1406    _mesa_reference_buffer_object(ctx, &dest->ArrayBufferObj,
1407                                  src->ArrayBufferObj);
1408    _mesa_reference_buffer_object(ctx, &dest->ArrayObj->ElementArrayBufferObj,
1409                                  src->ArrayObj->ElementArrayBufferObj);
1410 }
1411
1412 /**
1413  * Restore the content of src to dest.
1414  */
1415 static void
1416 restore_array_attrib(struct gl_context *ctx,
1417                      struct gl_array_attrib *dest,
1418                      struct gl_array_attrib *src)
1419 {
1420    /* The ARB_vertex_array_object spec says:
1421     *
1422     *     "BindVertexArray fails and an INVALID_OPERATION error is generated
1423     *     if array is not a name returned from a previous call to
1424     *     GenVertexArrays, or if such a name has since been deleted with
1425     *     DeleteVertexArrays."
1426     *
1427     * Therefore popping a deleted VAO cannot magically recreate it.
1428     *
1429     * The semantics of objects created using APPLE_vertex_array_objects behave
1430     * differently.  These objects expect to be recreated by pop.  Alas.
1431     */
1432    const bool arb_vao = (src->ArrayObj->Name != 0
1433                          && src->ArrayObj->ARBsemantics);
1434
1435    if (arb_vao && !_mesa_IsVertexArrayAPPLE(src->ArrayObj->Name))
1436       return;
1437
1438    _mesa_BindVertexArrayAPPLE(src->ArrayObj->Name);
1439
1440    /* Restore or recreate the buffer objects by the names ... */
1441    if (!arb_vao
1442        || src->ArrayBufferObj->Name == 0
1443        || _mesa_IsBufferARB(src->ArrayBufferObj->Name)) {
1444       /* ... and restore its content */
1445       copy_array_attrib(ctx, dest, src, false);
1446
1447       _mesa_BindBufferARB(GL_ARRAY_BUFFER_ARB,
1448                           src->ArrayBufferObj->Name);
1449    } else {
1450       copy_array_attrib(ctx, dest, src, true);
1451    }
1452
1453    if (!arb_vao
1454        || src->ArrayObj->ElementArrayBufferObj->Name == 0
1455        || _mesa_IsBufferARB(src->ArrayObj->ElementArrayBufferObj->Name))
1456       _mesa_BindBufferARB(GL_ELEMENT_ARRAY_BUFFER_ARB,
1457                           src->ArrayObj->ElementArrayBufferObj->Name);
1458 }
1459
1460 /**
1461  * init/alloc the fields of 'attrib'.
1462  * Needs to the init part matching free_array_attrib_data below.
1463  */
1464 static void
1465 init_array_attrib_data(struct gl_context *ctx,
1466                        struct gl_array_attrib *attrib)
1467 {
1468    /* Get a non driver gl_array_object. */
1469    attrib->ArrayObj = CALLOC_STRUCT( gl_array_object );
1470    _mesa_initialize_array_object(ctx, attrib->ArrayObj, 0);
1471 }
1472
1473 /**
1474  * Free/unreference the fields of 'attrib' but don't delete it (that's
1475  * done later in the calling code).
1476  * Needs to the cleanup part matching init_array_attrib_data above.
1477  */
1478 static void
1479 free_array_attrib_data(struct gl_context *ctx,
1480                        struct gl_array_attrib *attrib)
1481 {
1482    /* We use a non driver array object, so don't just unref since we would
1483     * end up using the drivers DeleteArrayObject function for deletion. */
1484    _mesa_delete_array_object(ctx, attrib->ArrayObj);
1485    attrib->ArrayObj = 0;
1486    _mesa_reference_buffer_object(ctx, &attrib->ArrayBufferObj, NULL);
1487 }
1488
1489
1490 void GLAPIENTRY
1491 _mesa_PushClientAttrib(GLbitfield mask)
1492 {
1493    struct gl_attrib_node *head;
1494
1495    GET_CURRENT_CONTEXT(ctx);
1496    ASSERT_OUTSIDE_BEGIN_END(ctx);
1497
1498    if (ctx->ClientAttribStackDepth >= MAX_CLIENT_ATTRIB_STACK_DEPTH) {
1499       _mesa_error( ctx, GL_STACK_OVERFLOW, "glPushClientAttrib" );
1500       return;
1501    }
1502
1503    /* Build linked list of attribute nodes which save all attribute
1504     * groups specified by the mask.
1505     */
1506    head = NULL;
1507
1508    if (mask & GL_CLIENT_PIXEL_STORE_BIT) {
1509       struct gl_pixelstore_attrib *attr;
1510       /* packing attribs */
1511       attr = CALLOC_STRUCT( gl_pixelstore_attrib );
1512       copy_pixelstore(ctx, attr, &ctx->Pack);
1513       save_attrib_data(&head, GL_CLIENT_PACK_BIT, attr);
1514       /* unpacking attribs */
1515       attr = CALLOC_STRUCT( gl_pixelstore_attrib );
1516       copy_pixelstore(ctx, attr, &ctx->Unpack);
1517       save_attrib_data(&head, GL_CLIENT_UNPACK_BIT, attr);
1518    }
1519
1520    if (mask & GL_CLIENT_VERTEX_ARRAY_BIT) {
1521       struct gl_array_attrib *attr;
1522       attr = CALLOC_STRUCT( gl_array_attrib );
1523       init_array_attrib_data(ctx, attr);
1524       save_array_attrib(ctx, attr, &ctx->Array);
1525       save_attrib_data(&head, GL_CLIENT_VERTEX_ARRAY_BIT, attr);
1526    }
1527
1528    ctx->ClientAttribStack[ctx->ClientAttribStackDepth] = head;
1529    ctx->ClientAttribStackDepth++;
1530 }
1531
1532
1533
1534
1535 void GLAPIENTRY
1536 _mesa_PopClientAttrib(void)
1537 {
1538    struct gl_attrib_node *node, *next;
1539
1540    GET_CURRENT_CONTEXT(ctx);
1541    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
1542
1543    if (ctx->ClientAttribStackDepth == 0) {
1544       _mesa_error( ctx, GL_STACK_UNDERFLOW, "glPopClientAttrib" );
1545       return;
1546    }
1547
1548    ctx->ClientAttribStackDepth--;
1549    node = ctx->ClientAttribStack[ctx->ClientAttribStackDepth];
1550
1551    while (node) {
1552       switch (node->kind) {
1553          case GL_CLIENT_PACK_BIT:
1554             {
1555                struct gl_pixelstore_attrib *store =
1556                   (struct gl_pixelstore_attrib *) node->data;
1557                copy_pixelstore(ctx, &ctx->Pack, store);
1558                _mesa_reference_buffer_object(ctx, &store->BufferObj, NULL);
1559             }
1560             ctx->NewState |= _NEW_PACKUNPACK;
1561             break;
1562          case GL_CLIENT_UNPACK_BIT:
1563             {
1564                struct gl_pixelstore_attrib *store =
1565                   (struct gl_pixelstore_attrib *) node->data;
1566                copy_pixelstore(ctx, &ctx->Unpack, store);
1567                _mesa_reference_buffer_object(ctx, &store->BufferObj, NULL);
1568             }
1569             ctx->NewState |= _NEW_PACKUNPACK;
1570             break;
1571          case GL_CLIENT_VERTEX_ARRAY_BIT: {
1572             struct gl_array_attrib * attr =
1573               (struct gl_array_attrib *) node->data;
1574             restore_array_attrib(ctx, &ctx->Array, attr);
1575             free_array_attrib_data(ctx, attr);
1576             ctx->NewState |= _NEW_ARRAY;
1577             break;
1578          }
1579          default:
1580             _mesa_problem( ctx, "Bad attrib flag in PopClientAttrib");
1581             break;
1582       }
1583
1584       next = node->next;
1585       FREE( node->data );
1586       FREE( node );
1587       node = next;
1588    }
1589 }
1590
1591
1592 void
1593 _mesa_init_attrib_dispatch(struct _glapi_table *disp)
1594 {
1595    SET_PopAttrib(disp, _mesa_PopAttrib);
1596    SET_PushAttrib(disp, _mesa_PushAttrib);
1597    SET_PopClientAttrib(disp, _mesa_PopClientAttrib);
1598    SET_PushClientAttrib(disp, _mesa_PushClientAttrib);
1599 }
1600
1601
1602 #endif /* FEATURE_attrib_stack */
1603
1604
1605 /**
1606  * Free any attribute state data that might be attached to the context.
1607  */
1608 void
1609 _mesa_free_attrib_data(struct gl_context *ctx)
1610 {
1611    while (ctx->AttribStackDepth > 0) {
1612       struct gl_attrib_node *attr, *next;
1613
1614       ctx->AttribStackDepth--;
1615       attr = ctx->AttribStack[ctx->AttribStackDepth];
1616
1617       while (attr) {
1618          if (attr->kind == GL_TEXTURE_BIT) {
1619             struct texture_state *texstate = (struct texture_state*)attr->data;
1620             GLuint u, tgt;
1621             /* clear references to the saved texture objects */
1622             for (u = 0; u < ctx->Const.MaxTextureUnits; u++) {
1623                for (tgt = 0; tgt < NUM_TEXTURE_TARGETS; tgt++) {
1624                   _mesa_reference_texobj(&texstate->SavedTexRef[u][tgt], NULL);
1625                }
1626             }
1627             _mesa_reference_shared_state(ctx, &texstate->SharedRef, NULL);
1628          }
1629          else {
1630             /* any other chunks of state that requires special handling? */
1631          }
1632
1633          next = attr->next;
1634          free(attr->data);
1635          free(attr);
1636          attr = next;
1637       }
1638    }
1639 }
1640
1641
1642 void _mesa_init_attrib( struct gl_context *ctx )
1643 {
1644    /* Renderer and client attribute stacks */
1645    ctx->AttribStackDepth = 0;
1646    ctx->ClientAttribStackDepth = 0;
1647 }