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 Map2Color4;
  98    GLboolean Map2Index;
  99    GLboolean Map2Normal;
 100    GLboolean Map2TextureCoord1;
 101    GLboolean Map2TextureCoord2;
 102    GLboolean Map2TextureCoord3;
 103    GLboolean Map2TextureCoord4;
 104    GLboolean Map2Vertex3;
 105    GLboolean Map2Vertex4;
 106
 107    GLboolean Normalize;
 108    GLboolean PixelTexture;
 109    GLboolean PointSmooth;
 110    GLboolean PolygonOffsetPoint;
 111    GLboolean PolygonOffsetLine;
 112    GLboolean PolygonOffsetFill;
 113    GLboolean PolygonSmooth;
 114    GLboolean PolygonStipple;
 115    GLboolean RescaleNormals;
 116    GLboolean Scissor;
 117    GLboolean Stencil;
 118    GLboolean StencilTwoSide;          /* GL_EXT_stencil_two_side */
 119    GLboolean MultisampleEnabled;      /* GL_ARB_multisample */
 120    GLboolean SampleAlphaToCoverage;   /* GL_ARB_multisample */
 121    GLboolean SampleAlphaToOne;        /* GL_ARB_multisample */
 122    GLboolean SampleCoverage;          /* GL_ARB_multisample */
 123    GLboolean RasterPositionUnclipped; /* GL_IBM_rasterpos_clip */
 124
 125    GLbitfield Texture[MAX_TEXTURE_UNITS];
 126    GLbitfield TexGen[MAX_TEXTURE_UNITS];
 127
 128    /* GL_ARB_vertex_program */
 129    GLboolean VertexProgram;
 130    GLboolean VertexProgramPointSize;
 131    GLboolean VertexProgramTwoSide;
 132
 133    /* GL_ARB_fragment_program */
 134    GLboolean FragmentProgram;
 135
 136    /* GL_ARB_point_sprite / GL_NV_point_sprite */
 137    GLboolean PointSprite;
 138    GLboolean FragmentShaderATI;
 139
 140    /* GL_ARB_framebuffer_sRGB / GL_EXT_framebuffer_sRGB */
 141    GLboolean sRGBEnabled;
 142 };
 143
 144
 145 /**
 146  * Node for the attribute stack.
 147  */
 148 struct gl_attrib_node
 149 {
 150    GLbitfield kind;
 151    void *data;
 152    struct gl_attrib_node *next;
 153 };
 154
 155
 156
 157 /**
 158  * Special struct for saving/restoring texture state (GL_TEXTURE_BIT)
 159  */
 160 struct texture_state
 161 {
 162    struct gl_texture_attrib Texture;  /**< The usual context state */
 163
 164    /** to save per texture object state (wrap modes, filters, etc): */
 165    struct gl_texture_object SavedObj[MAX_TEXTURE_UNITS][NUM_TEXTURE_TARGETS];
 166
 167    /**
 168     * To save references to texture objects (so they don't get accidentally
 169     * deleted while saved in the attribute stack).
 170     */
 171    struct gl_texture_object *SavedTexRef[MAX_TEXTURE_UNITS][NUM_TEXTURE_TARGETS];
 172
 173    /* We need to keep a reference to the shared state.  That's where the
 174     * default texture objects are kept.  We don't want that state to be
 175     * freed while the attribute stack contains pointers to any default
 176     * texture objects.
 177     */
 178    struct gl_shared_state *SharedRef;
 179 };
 180
 181
 182 /**
 183  * Allocate new attribute node of given type/kind.  Attach payload data.
 184  * Insert it into the linked list named by 'head'.
 185  */
 186 static void
 187 save_attrib_data(struct gl_attrib_node **head,
 188                  GLbitfield kind, void *payload)
 189 {
 190    struct gl_attrib_node *n = MALLOC_STRUCT(gl_attrib_node);
 191    if (n) {
 192       n->kind = kind;
 193       n->data = payload;
 194       /* insert at head */
 195       n->next = *head;
 196       *head = n;
 197    }
 198    else {
 199       /* out of memory! */
 200    }
 201 }
 202
 203
 204 void GLAPIENTRY
 205 _mesa_PushAttrib(GLbitfield mask)
 206 {
 207    struct gl_attrib_node *head;
 208
 209    GET_CURRENT_CONTEXT(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       attr->Map2Color4 = ctx->Eval.Map2Color4;
 289       attr->Map2Index = ctx->Eval.Map2Index;
 290       attr->Map2Normal = ctx->Eval.Map2Normal;
 291       attr->Map2TextureCoord1 = ctx->Eval.Map2TextureCoord1;
 292       attr->Map2TextureCoord2 = ctx->Eval.Map2TextureCoord2;
 293       attr->Map2TextureCoord3 = ctx->Eval.Map2TextureCoord3;
 294       attr->Map2TextureCoord4 = ctx->Eval.Map2TextureCoord4;
 295       attr->Map2Vertex3 = ctx->Eval.Map2Vertex3;
 296       attr->Map2Vertex4 = ctx->Eval.Map2Vertex4;
 297       attr->Normalize = ctx->Transform.Normalize;
 298       attr->RasterPositionUnclipped = ctx->Transform.RasterPositionUnclipped;
 299       attr->PointSmooth = ctx->Point.SmoothFlag;
 300       attr->PointSprite = ctx->Point.PointSprite;
 301       attr->PolygonOffsetPoint = ctx->Polygon.OffsetPoint;
 302       attr->PolygonOffsetLine = ctx->Polygon.OffsetLine;
 303       attr->PolygonOffsetFill = ctx->Polygon.OffsetFill;
 304       attr->PolygonSmooth = ctx->Polygon.SmoothFlag;
 305       attr->PolygonStipple = ctx->Polygon.StippleFlag;
 306       attr->RescaleNormals = ctx->Transform.RescaleNormals;
 307       attr->Scissor = ctx->Scissor.Enabled;
 308       attr->Stencil = ctx->Stencil.Enabled;
 309       attr->StencilTwoSide = ctx->Stencil.TestTwoSide;
 310       attr->MultisampleEnabled = ctx->Multisample.Enabled;
 311       attr->SampleAlphaToCoverage = ctx->Multisample.SampleAlphaToCoverage;
 312       attr->SampleAlphaToOne = ctx->Multisample.SampleAlphaToOne;
 313       attr->SampleCoverage = ctx->Multisample.SampleCoverage;
 314       for (i = 0; i < ctx->Const.MaxTextureUnits; i++) {
 315          attr->Texture[i] = ctx->Texture.Unit[i].Enabled;
 316          attr->TexGen[i] = ctx->Texture.Unit[i].TexGenEnabled;
 317       }
 318       /* GL_ARB_vertex_program */
 319       attr->VertexProgram = ctx->VertexProgram.Enabled;
 320       attr->VertexProgramPointSize = ctx->VertexProgram.PointSizeEnabled;
 321       attr->VertexProgramTwoSide = ctx->VertexProgram.TwoSideEnabled;
 322
 323       /* GL_ARB_fragment_program */
 324       attr->FragmentProgram = ctx->FragmentProgram.Enabled;
 325
 326       save_attrib_data(&head, GL_ENABLE_BIT, attr);
 327
 328       /* GL_ARB_framebuffer_sRGB / GL_EXT_framebuffer_sRGB */
 329       attr->sRGBEnabled = ctx->Color.sRGBEnabled;
 330    }
 331
 332    if (mask & GL_EVAL_BIT) {
 333       struct gl_eval_attrib *attr;
 334       attr = MALLOC_STRUCT( gl_eval_attrib );
 335       memcpy( attr, &ctx->Eval, sizeof(struct gl_eval_attrib) );
 336       save_attrib_data(&head, GL_EVAL_BIT, attr);
 337    }
 338
 339    if (mask & GL_FOG_BIT) {
 340       struct gl_fog_attrib *attr;
 341       attr = MALLOC_STRUCT( gl_fog_attrib );
 342       memcpy( attr, &ctx->Fog, sizeof(struct gl_fog_attrib) );
 343       save_attrib_data(&head, GL_FOG_BIT, attr);
 344    }
 345
 346    if (mask & GL_HINT_BIT) {
 347       struct gl_hint_attrib *attr;
 348       attr = MALLOC_STRUCT( gl_hint_attrib );
 349       memcpy( attr, &ctx->Hint, sizeof(struct gl_hint_attrib) );
 350       save_attrib_data(&head, GL_HINT_BIT, attr);
 351    }
 352
 353    if (mask & GL_LIGHTING_BIT) {
 354       struct gl_light_attrib *attr;
 355       FLUSH_CURRENT(ctx, 0);    /* flush material changes */
 356       attr = MALLOC_STRUCT( gl_light_attrib );
 357       memcpy( attr, &ctx->Light, sizeof(struct gl_light_attrib) );
 358       save_attrib_data(&head, GL_LIGHTING_BIT, attr);
 359    }
 360
 361    if (mask & GL_LINE_BIT) {
 362       struct gl_line_attrib *attr;
 363       attr = MALLOC_STRUCT( gl_line_attrib );
 364       memcpy( attr, &ctx->Line, sizeof(struct gl_line_attrib) );
 365       save_attrib_data(&head, GL_LINE_BIT, attr);
 366    }
 367
 368    if (mask & GL_LIST_BIT) {
 369       struct gl_list_attrib *attr;
 370       attr = MALLOC_STRUCT( gl_list_attrib );
 371       memcpy( attr, &ctx->List, sizeof(struct gl_list_attrib) );
 372       save_attrib_data(&head, GL_LIST_BIT, attr);
 373    }
 374
 375    if (mask & GL_PIXEL_MODE_BIT) {
 376       struct gl_pixel_attrib *attr;
 377       attr = MALLOC_STRUCT( gl_pixel_attrib );
 378       memcpy( attr, &ctx->Pixel, sizeof(struct gl_pixel_attrib) );
 379       /* push the Read FBO's ReadBuffer state, not ctx->Pixel.ReadBuffer */
 380       attr->ReadBuffer = ctx->ReadBuffer->ColorReadBuffer;
 381       save_attrib_data(&head, GL_PIXEL_MODE_BIT, attr);
 382    }
 383
 384    if (mask & GL_POINT_BIT) {
 385       struct gl_point_attrib *attr;
 386       attr = MALLOC_STRUCT( gl_point_attrib );
 387       memcpy( attr, &ctx->Point, sizeof(struct gl_point_attrib) );
 388       save_attrib_data(&head, GL_POINT_BIT, attr);
 389    }
 390
 391    if (mask & GL_POLYGON_BIT) {
 392       struct gl_polygon_attrib *attr;
 393       attr = MALLOC_STRUCT( gl_polygon_attrib );
 394       memcpy( attr, &ctx->Polygon, sizeof(struct gl_polygon_attrib) );
 395       save_attrib_data(&head, GL_POLYGON_BIT, attr);
 396    }
 397
 398    if (mask & GL_POLYGON_STIPPLE_BIT) {
 399       GLuint *stipple;
 400       stipple = malloc( 32*sizeof(GLuint) );
 401       memcpy( stipple, ctx->PolygonStipple, 32*sizeof(GLuint) );
 402       save_attrib_data(&head, GL_POLYGON_STIPPLE_BIT, stipple);
 403    }
 404
 405    if (mask & GL_SCISSOR_BIT) {
 406       struct gl_scissor_attrib *attr;
 407       attr = MALLOC_STRUCT( gl_scissor_attrib );
 408       memcpy( attr, &ctx->Scissor, sizeof(struct gl_scissor_attrib) );
 409       save_attrib_data(&head, GL_SCISSOR_BIT, attr);
 410    }
 411
 412    if (mask & GL_STENCIL_BUFFER_BIT) {
 413       struct gl_stencil_attrib *attr;
 414       attr = MALLOC_STRUCT( gl_stencil_attrib );
 415       memcpy( attr, &ctx->Stencil, sizeof(struct gl_stencil_attrib) );
 416       save_attrib_data(&head, GL_STENCIL_BUFFER_BIT, attr);
 417    }
 418
 419    if (mask & GL_TEXTURE_BIT) {
 420       struct texture_state *texstate = CALLOC_STRUCT(texture_state);
 421       GLuint u, tex;
 422
 423       if (!texstate) {
 424          _mesa_error(ctx, GL_OUT_OF_MEMORY, "glPushAttrib(GL_TEXTURE_BIT)");
 425          goto end;
 426       }
 427
 428       _mesa_lock_context_textures(ctx);
 429
 430       /* copy/save the bulk of texture state here */
 431       memcpy(&texstate->Texture, &ctx->Texture, sizeof(ctx->Texture));
 432
 433       /* Save references to the currently bound texture objects so they don't
 434        * accidentally get deleted while referenced in the attribute stack.
 435        */
 436       for (u = 0; u < ctx->Const.MaxTextureUnits; u++) {
 437          for (tex = 0; tex < NUM_TEXTURE_TARGETS; tex++) {
 438             _mesa_reference_texobj(&texstate->SavedTexRef[u][tex],
 439                                    ctx->Texture.Unit[u].CurrentTex[tex]);
 440          }
 441       }
 442
 443       /* copy state/contents of the currently bound texture objects */
 444       for (u = 0; u < ctx->Const.MaxTextureUnits; u++) {
 445          for (tex = 0; tex < NUM_TEXTURE_TARGETS; tex++) {
 446             _mesa_copy_texture_object(&texstate->SavedObj[u][tex],
 447                                       ctx->Texture.Unit[u].CurrentTex[tex]);
 448          }
 449       }
 450
 451       _mesa_reference_shared_state(ctx, &texstate->SharedRef, ctx->Shared);
 452
 453       _mesa_unlock_context_textures(ctx);
 454
 455       save_attrib_data(&head, GL_TEXTURE_BIT, texstate);
 456    }
 457
 458    if (mask & GL_TRANSFORM_BIT) {
 459       struct gl_transform_attrib *attr;
 460       attr = MALLOC_STRUCT( gl_transform_attrib );
 461       memcpy( attr, &ctx->Transform, sizeof(struct gl_transform_attrib) );
 462       save_attrib_data(&head, GL_TRANSFORM_BIT, attr);
 463    }
 464
 465    if (mask & GL_VIEWPORT_BIT) {
 466       struct gl_viewport_attrib *attr;
 467       attr = MALLOC_STRUCT( gl_viewport_attrib );
 468       memcpy( attr, &ctx->Viewport, sizeof(struct gl_viewport_attrib) );
 469       save_attrib_data(&head, GL_VIEWPORT_BIT, attr);
 470    }
 471
 472    /* GL_ARB_multisample */
 473    if (mask & GL_MULTISAMPLE_BIT_ARB) {
 474       struct gl_multisample_attrib *attr;
 475       attr = MALLOC_STRUCT( gl_multisample_attrib );
 476       memcpy( attr, &ctx->Multisample, sizeof(struct gl_multisample_attrib) );
 477       save_attrib_data(&head, GL_MULTISAMPLE_BIT_ARB, attr);
 478    }
 479
 480 end:
 481    ctx->AttribStack[ctx->AttribStackDepth] = head;
 482    ctx->AttribStackDepth++;
 483 }
 484
 485
 486
 487 static void
 488 pop_enable_group(struct gl_context *ctx, const struct gl_enable_attrib *enable)
 489 {
 490    const GLuint curTexUnitSave = ctx->Texture.CurrentUnit;
 491    GLuint i;
 492
 493 #define TEST_AND_UPDATE(VALUE, NEWVALUE, ENUM)          \
 494         if ((VALUE) != (NEWVALUE)) {                    \
 495            _mesa_set_enable( ctx, ENUM, (NEWVALUE) );   \
 496         }
 497
 498    TEST_AND_UPDATE(ctx->Color.AlphaEnabled, enable->AlphaTest, GL_ALPHA_TEST);
 499    if (ctx->Color.BlendEnabled != enable->Blend) {
 500       if (ctx->Extensions.EXT_draw_buffers2) {
 501          GLuint i;
 502          for (i = 0; i < ctx->Const.MaxDrawBuffers; i++) {
 503             _mesa_set_enablei(ctx, GL_BLEND, i, (enable->Blend >> i) & 1);
 504          }
 505       }
 506       else {
 507          _mesa_set_enable(ctx, GL_BLEND, (enable->Blend & 1));
 508       }
 509    }
 510
 511    for (i=0;i<ctx->Const.MaxClipPlanes;i++) {
 512       const GLuint mask = 1 << i;
 513       if ((ctx->Transform.ClipPlanesEnabled & mask) != (enable->ClipPlanes & mask))
 514           _mesa_set_enable(ctx, (GLenum) (GL_CLIP_PLANE0 + i),
 515                            !!(enable->ClipPlanes & mask));
 516    }
 517
 518    TEST_AND_UPDATE(ctx->Light.ColorMaterialEnabled, enable->ColorMaterial,
 519                    GL_COLOR_MATERIAL);
 520    TEST_AND_UPDATE(ctx->Polygon.CullFlag, enable->CullFace, GL_CULL_FACE);
 521    TEST_AND_UPDATE(ctx->Transform.DepthClamp, enable->DepthClamp,
 522                    GL_DEPTH_CLAMP);
 523    TEST_AND_UPDATE(ctx->Depth.Test, enable->DepthTest, GL_DEPTH_TEST);
 524    TEST_AND_UPDATE(ctx->Color.DitherFlag, enable->Dither, GL_DITHER);
 525    TEST_AND_UPDATE(ctx->Fog.Enabled, enable->Fog, GL_FOG);
 526    TEST_AND_UPDATE(ctx->Light.Enabled, enable->Lighting, GL_LIGHTING);
 527    TEST_AND_UPDATE(ctx->Line.SmoothFlag, enable->LineSmooth, GL_LINE_SMOOTH);
 528    TEST_AND_UPDATE(ctx->Line.StippleFlag, enable->LineStipple,
 529                    GL_LINE_STIPPLE);
 530    TEST_AND_UPDATE(ctx->Color.IndexLogicOpEnabled, enable->IndexLogicOp,
 531                    GL_INDEX_LOGIC_OP);
 532    TEST_AND_UPDATE(ctx->Color.ColorLogicOpEnabled, enable->ColorLogicOp,
 533                    GL_COLOR_LOGIC_OP);
 534
 535    TEST_AND_UPDATE(ctx->Eval.Map1Color4, enable->Map1Color4, GL_MAP1_COLOR_4);
 536    TEST_AND_UPDATE(ctx->Eval.Map1Index, enable->Map1Index, GL_MAP1_INDEX);
 537    TEST_AND_UPDATE(ctx->Eval.Map1Normal, enable->Map1Normal, GL_MAP1_NORMAL);
 538    TEST_AND_UPDATE(ctx->Eval.Map1TextureCoord1, enable->Map1TextureCoord1,
 539                    GL_MAP1_TEXTURE_COORD_1);
 540    TEST_AND_UPDATE(ctx->Eval.Map1TextureCoord2, enable->Map1TextureCoord2,
 541                    GL_MAP1_TEXTURE_COORD_2);
 542    TEST_AND_UPDATE(ctx->Eval.Map1TextureCoord3, enable->Map1TextureCoord3,
 543                    GL_MAP1_TEXTURE_COORD_3);
 544    TEST_AND_UPDATE(ctx->Eval.Map1TextureCoord4, enable->Map1TextureCoord4,
 545                    GL_MAP1_TEXTURE_COORD_4);
 546    TEST_AND_UPDATE(ctx->Eval.Map1Vertex3, enable->Map1Vertex3,
 547                    GL_MAP1_VERTEX_3);
 548    TEST_AND_UPDATE(ctx->Eval.Map1Vertex4, enable->Map1Vertex4,
 549                    GL_MAP1_VERTEX_4);
 550
 551    TEST_AND_UPDATE(ctx->Eval.Map2Color4, enable->Map2Color4, GL_MAP2_COLOR_4);
 552    TEST_AND_UPDATE(ctx->Eval.Map2Index, enable->Map2Index, GL_MAP2_INDEX);
 553    TEST_AND_UPDATE(ctx->Eval.Map2Normal, enable->Map2Normal, GL_MAP2_NORMAL);
 554    TEST_AND_UPDATE(ctx->Eval.Map2TextureCoord1, enable->Map2TextureCoord1,
 555                    GL_MAP2_TEXTURE_COORD_1);
 556    TEST_AND_UPDATE(ctx->Eval.Map2TextureCoord2, enable->Map2TextureCoord2,
 557                    GL_MAP2_TEXTURE_COORD_2);
 558    TEST_AND_UPDATE(ctx->Eval.Map2TextureCoord3, enable->Map2TextureCoord3,
 559                    GL_MAP2_TEXTURE_COORD_3);
 560    TEST_AND_UPDATE(ctx->Eval.Map2TextureCoord4, enable->Map2TextureCoord4,
 561                    GL_MAP2_TEXTURE_COORD_4);
 562    TEST_AND_UPDATE(ctx->Eval.Map2Vertex3, enable->Map2Vertex3,
 563                    GL_MAP2_VERTEX_3);
 564    TEST_AND_UPDATE(ctx->Eval.Map2Vertex4, enable->Map2Vertex4,
 565                    GL_MAP2_VERTEX_4);
 566
 567    TEST_AND_UPDATE(ctx->Eval.AutoNormal, enable->AutoNormal, GL_AUTO_NORMAL);
 568    TEST_AND_UPDATE(ctx->Transform.Normalize, enable->Normalize, GL_NORMALIZE);
 569    TEST_AND_UPDATE(ctx->Transform.RescaleNormals, enable->RescaleNormals,
 570                    GL_RESCALE_NORMAL_EXT);
 571    TEST_AND_UPDATE(ctx->Transform.RasterPositionUnclipped,
 572                    enable->RasterPositionUnclipped,
 573                    GL_RASTER_POSITION_UNCLIPPED_IBM);
 574    TEST_AND_UPDATE(ctx->Point.SmoothFlag, enable->PointSmooth,
 575                    GL_POINT_SMOOTH);
 576    if (ctx->Extensions.NV_point_sprite || ctx->Extensions.ARB_point_sprite) {
 577       TEST_AND_UPDATE(ctx->Point.PointSprite, enable->PointSprite,
 578                       GL_POINT_SPRITE_NV);
 579    }
 580    TEST_AND_UPDATE(ctx->Polygon.OffsetPoint, enable->PolygonOffsetPoint,
 581                    GL_POLYGON_OFFSET_POINT);
 582    TEST_AND_UPDATE(ctx->Polygon.OffsetLine, enable->PolygonOffsetLine,
 583                    GL_POLYGON_OFFSET_LINE);
 584    TEST_AND_UPDATE(ctx->Polygon.OffsetFill, enable->PolygonOffsetFill,
 585                    GL_POLYGON_OFFSET_FILL);
 586    TEST_AND_UPDATE(ctx->Polygon.SmoothFlag, enable->PolygonSmooth,
 587                    GL_POLYGON_SMOOTH);
 588    TEST_AND_UPDATE(ctx->Polygon.StippleFlag, enable->PolygonStipple,
 589                    GL_POLYGON_STIPPLE);
 590    TEST_AND_UPDATE(ctx->Scissor.Enabled, enable->Scissor, GL_SCISSOR_TEST);
 591    TEST_AND_UPDATE(ctx->Stencil.Enabled, enable->Stencil, GL_STENCIL_TEST);
 592    if (ctx->Extensions.EXT_stencil_two_side) {
 593       TEST_AND_UPDATE(ctx->Stencil.TestTwoSide, enable->StencilTwoSide, GL_STENCIL_TEST_TWO_SIDE_EXT);
 594    }
 595    TEST_AND_UPDATE(ctx->Multisample.Enabled, enable->MultisampleEnabled,
 596                    GL_MULTISAMPLE_ARB);
 597    TEST_AND_UPDATE(ctx->Multisample.SampleAlphaToCoverage,
 598                    enable->SampleAlphaToCoverage,
 599                    GL_SAMPLE_ALPHA_TO_COVERAGE_ARB);
 600    TEST_AND_UPDATE(ctx->Multisample.SampleAlphaToOne,
 601                    enable->SampleAlphaToOne,
 602                    GL_SAMPLE_ALPHA_TO_ONE_ARB);
 603    TEST_AND_UPDATE(ctx->Multisample.SampleCoverage,
 604                    enable->SampleCoverage,
 605                    GL_SAMPLE_COVERAGE_ARB);
 606    /* GL_ARB_vertex_program */
 607    TEST_AND_UPDATE(ctx->VertexProgram.Enabled,
 608                    enable->VertexProgram,
 609                    GL_VERTEX_PROGRAM_ARB);
 610    TEST_AND_UPDATE(ctx->VertexProgram.PointSizeEnabled,
 611                    enable->VertexProgramPointSize,
 612                    GL_VERTEX_PROGRAM_POINT_SIZE_ARB);
 613    TEST_AND_UPDATE(ctx->VertexProgram.TwoSideEnabled,
 614                    enable->VertexProgramTwoSide,
 615                    GL_VERTEX_PROGRAM_TWO_SIDE_ARB);
 616
 617    /* GL_ARB_fragment_program */
 618    TEST_AND_UPDATE(ctx->FragmentProgram.Enabled,
 619                    enable->FragmentProgram,
 620                    GL_FRAGMENT_PROGRAM_ARB);
 621
 622    /* GL_ARB_framebuffer_sRGB / GL_EXT_framebuffer_sRGB */
 623    TEST_AND_UPDATE(ctx->Color.sRGBEnabled, enable->sRGBEnabled,
 624                    GL_FRAMEBUFFER_SRGB);
 625
 626    /* texture unit enables */
 627    for (i = 0; i < ctx->Const.MaxTextureUnits; i++) {
 628       const GLbitfield enabled = enable->Texture[i];
 629       const GLbitfield genEnabled = enable->TexGen[i];
 630
 631       if (ctx->Texture.Unit[i].Enabled != enabled) {
 632          _mesa_ActiveTexture(GL_TEXTURE0 + i);
 633
 634          _mesa_set_enable(ctx, GL_TEXTURE_1D, !!(enabled & TEXTURE_1D_BIT));
 635          _mesa_set_enable(ctx, GL_TEXTURE_2D, !!(enabled & TEXTURE_2D_BIT));
 636          _mesa_set_enable(ctx, GL_TEXTURE_3D, !!(enabled & TEXTURE_3D_BIT));
 637          if (ctx->Extensions.NV_texture_rectangle) {
 638             _mesa_set_enable(ctx, GL_TEXTURE_RECTANGLE_ARB,
 639                              !!(enabled & TEXTURE_RECT_BIT));
 640          }
 641          if (ctx->Extensions.ARB_texture_cube_map) {
 642             _mesa_set_enable(ctx, GL_TEXTURE_CUBE_MAP,
 643                              !!(enabled & TEXTURE_CUBE_BIT));
 644          }
 645          if (ctx->Extensions.MESA_texture_array) {
 646             _mesa_set_enable(ctx, GL_TEXTURE_1D_ARRAY_EXT,
 647                              !!(enabled & TEXTURE_1D_ARRAY_BIT));
 648             _mesa_set_enable(ctx, GL_TEXTURE_2D_ARRAY_EXT,
 649                              !!(enabled & TEXTURE_2D_ARRAY_BIT));
 650          }
 651       }
 652
 653       if (ctx->Texture.Unit[i].TexGenEnabled != genEnabled) {
 654          _mesa_ActiveTexture(GL_TEXTURE0 + i);
 655          _mesa_set_enable(ctx, GL_TEXTURE_GEN_S, !!(genEnabled & S_BIT));
 656          _mesa_set_enable(ctx, GL_TEXTURE_GEN_T, !!(genEnabled & T_BIT));
 657          _mesa_set_enable(ctx, GL_TEXTURE_GEN_R, !!(genEnabled & R_BIT));
 658          _mesa_set_enable(ctx, GL_TEXTURE_GEN_Q, !!(genEnabled & Q_BIT));
 659       }
 660    }
 661
 662    _mesa_ActiveTexture(GL_TEXTURE0 + curTexUnitSave);
 663 }
 664
 665
 666 /**
 667  * Pop/restore texture attribute/group state.
 668  */
 669 static void
 670 pop_texture_group(struct gl_context *ctx, struct texture_state *texstate)
 671 {
 672    GLuint u;
 673
 674    _mesa_lock_context_textures(ctx);
 675
 676    for (u = 0; u < ctx->Const.MaxTextureUnits; u++) {
 677       const struct gl_texture_unit *unit = &texstate->Texture.Unit[u];
 678       GLuint tgt;
 679
 680       _mesa_ActiveTexture(GL_TEXTURE0_ARB + u);
 681       _mesa_set_enable(ctx, GL_TEXTURE_1D, !!(unit->Enabled & TEXTURE_1D_BIT));
 682       _mesa_set_enable(ctx, GL_TEXTURE_2D, !!(unit->Enabled & TEXTURE_2D_BIT));
 683       _mesa_set_enable(ctx, GL_TEXTURE_3D, !!(unit->Enabled & TEXTURE_3D_BIT));
 684       if (ctx->Extensions.ARB_texture_cube_map) {
 685          _mesa_set_enable(ctx, GL_TEXTURE_CUBE_MAP_ARB,
 686                           !!(unit->Enabled & TEXTURE_CUBE_BIT));
 687       }
 688       if (ctx->Extensions.NV_texture_rectangle) {
 689          _mesa_set_enable(ctx, GL_TEXTURE_RECTANGLE_NV,
 690                           !!(unit->Enabled & TEXTURE_RECT_BIT));
 691       }
 692       if (ctx->Extensions.MESA_texture_array) {
 693          _mesa_set_enable(ctx, GL_TEXTURE_1D_ARRAY_EXT,
 694                           !!(unit->Enabled & TEXTURE_1D_ARRAY_BIT));
 695          _mesa_set_enable(ctx, GL_TEXTURE_2D_ARRAY_EXT,
 696                           !!(unit->Enabled & TEXTURE_2D_ARRAY_BIT));
 697       }
 698       _mesa_TexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, unit->EnvMode);
 699       _mesa_TexEnvfv(GL_TEXTURE_ENV, GL_TEXTURE_ENV_COLOR, unit->EnvColor);
 700       _mesa_TexGeni(GL_S, GL_TEXTURE_GEN_MODE, unit->GenS.Mode);
 701       _mesa_TexGeni(GL_T, GL_TEXTURE_GEN_MODE, unit->GenT.Mode);
 702       _mesa_TexGeni(GL_R, GL_TEXTURE_GEN_MODE, unit->GenR.Mode);
 703       _mesa_TexGeni(GL_Q, GL_TEXTURE_GEN_MODE, unit->GenQ.Mode);
 704       _mesa_TexGenfv(GL_S, GL_OBJECT_PLANE, unit->GenS.ObjectPlane);
 705       _mesa_TexGenfv(GL_T, GL_OBJECT_PLANE, unit->GenT.ObjectPlane);
 706       _mesa_TexGenfv(GL_R, GL_OBJECT_PLANE, unit->GenR.ObjectPlane);
 707       _mesa_TexGenfv(GL_Q, GL_OBJECT_PLANE, unit->GenQ.ObjectPlane);
 708       /* Eye plane done differently to avoid re-transformation */
 709       {
 710          struct gl_texture_unit *destUnit = &ctx->Texture.Unit[u];
 711          COPY_4FV(destUnit->GenS.EyePlane, unit->GenS.EyePlane);
 712          COPY_4FV(destUnit->GenT.EyePlane, unit->GenT.EyePlane);
 713          COPY_4FV(destUnit->GenR.EyePlane, unit->GenR.EyePlane);
 714          COPY_4FV(destUnit->GenQ.EyePlane, unit->GenQ.EyePlane);
 715          if (ctx->Driver.TexGen) {
 716             ctx->Driver.TexGen(ctx, GL_S, GL_EYE_PLANE, unit->GenS.EyePlane);
 717             ctx->Driver.TexGen(ctx, GL_T, GL_EYE_PLANE, unit->GenT.EyePlane);
 718             ctx->Driver.TexGen(ctx, GL_R, GL_EYE_PLANE, unit->GenR.EyePlane);
 719             ctx->Driver.TexGen(ctx, GL_Q, GL_EYE_PLANE, unit->GenQ.EyePlane);
 720          }
 721       }
 722       _mesa_set_enable(ctx, GL_TEXTURE_GEN_S, !!(unit->TexGenEnabled & S_BIT));
 723       _mesa_set_enable(ctx, GL_TEXTURE_GEN_T, !!(unit->TexGenEnabled & T_BIT));
 724       _mesa_set_enable(ctx, GL_TEXTURE_GEN_R, !!(unit->TexGenEnabled & R_BIT));
 725       _mesa_set_enable(ctx, GL_TEXTURE_GEN_Q, !!(unit->TexGenEnabled & Q_BIT));
 726       _mesa_TexEnvf(GL_TEXTURE_FILTER_CONTROL, GL_TEXTURE_LOD_BIAS,
 727                     unit->LodBias);
 728       _mesa_TexEnvi(GL_TEXTURE_ENV, GL_COMBINE_RGB,
 729                     unit->Combine.ModeRGB);
 730       _mesa_TexEnvi(GL_TEXTURE_ENV, GL_COMBINE_ALPHA,
 731                     unit->Combine.ModeA);
 732       {
 733          const GLuint n = ctx->Extensions.NV_texture_env_combine4 ? 4 : 3;
 734          GLuint i;
 735          for (i = 0; i < n; i++) {
 736             _mesa_TexEnvi(GL_TEXTURE_ENV, GL_SOURCE0_RGB + i,
 737                           unit->Combine.SourceRGB[i]);
 738             _mesa_TexEnvi(GL_TEXTURE_ENV, GL_SOURCE0_ALPHA + i,
 739                           unit->Combine.SourceA[i]);
 740             _mesa_TexEnvi(GL_TEXTURE_ENV, GL_OPERAND0_RGB + i,
 741                           unit->Combine.OperandRGB[i]);
 742             _mesa_TexEnvi(GL_TEXTURE_ENV, GL_OPERAND0_ALPHA + i,
 743                           unit->Combine.OperandA[i]);
 744          }
 745       }
 746       _mesa_TexEnvi(GL_TEXTURE_ENV, GL_RGB_SCALE,
 747                     1 << unit->Combine.ScaleShiftRGB);
 748       _mesa_TexEnvi(GL_TEXTURE_ENV, GL_ALPHA_SCALE,
 749                     1 << unit->Combine.ScaleShiftA);
 750
 751       /* Restore texture object state for each target */
 752       for (tgt = 0; tgt < NUM_TEXTURE_TARGETS; tgt++) {
 753          const struct gl_texture_object *obj = NULL;
 754          const struct gl_sampler_object *samp;
 755          GLenum target;
 756
 757          obj = &texstate->SavedObj[u][tgt];
 758
 759          /* don't restore state for unsupported targets to prevent
 760           * raising GL errors.
 761           */
 762          if (obj->Target == GL_TEXTURE_CUBE_MAP_ARB &&
 763              !ctx->Extensions.ARB_texture_cube_map) {
 764             continue;
 765          }
 766          else if (obj->Target == GL_TEXTURE_RECTANGLE_NV &&
 767                   !ctx->Extensions.NV_texture_rectangle) {
 768             continue;
 769          }
 770          else if ((obj->Target == GL_TEXTURE_1D_ARRAY_EXT ||
 771                    obj->Target == GL_TEXTURE_2D_ARRAY_EXT) &&
 772                   !ctx->Extensions.MESA_texture_array) {
 773             continue;
 774          }
 775          else if (obj->Target == GL_TEXTURE_CUBE_MAP_ARRAY &&
 776              !ctx->Extensions.ARB_texture_cube_map_array) {
 777             continue;
 778          } else if (obj->Target == GL_TEXTURE_BUFFER)
 779             continue;
 780          else if (obj->Target == GL_TEXTURE_EXTERNAL_OES)
 781             continue;
 782          else if (obj->Target == GL_TEXTURE_2D_MULTISAMPLE ||
 783                   obj->Target == GL_TEXTURE_2D_MULTISAMPLE_ARRAY)
 784             continue;
 785
 786          target = obj->Target;
 787
 788          _mesa_BindTexture(target, obj->Name);
 789
 790          samp = &obj->Sampler;
 791
 792          _mesa_TexParameterfv(target, GL_TEXTURE_BORDER_COLOR, samp->BorderColor.f);
 793          _mesa_TexParameteri(target, GL_TEXTURE_WRAP_S, samp->WrapS);
 794          _mesa_TexParameteri(target, GL_TEXTURE_WRAP_T, samp->WrapT);
 795          _mesa_TexParameteri(target, GL_TEXTURE_WRAP_R, samp->WrapR);
 796          _mesa_TexParameteri(target, GL_TEXTURE_MIN_FILTER, samp->MinFilter);
 797          _mesa_TexParameteri(target, GL_TEXTURE_MAG_FILTER, samp->MagFilter);
 798          _mesa_TexParameterf(target, GL_TEXTURE_MIN_LOD, samp->MinLod);
 799          _mesa_TexParameterf(target, GL_TEXTURE_MAX_LOD, samp->MaxLod);
 800          _mesa_TexParameterf(target, GL_TEXTURE_LOD_BIAS, samp->LodBias);
 801          _mesa_TexParameterf(target, GL_TEXTURE_PRIORITY, obj->Priority);
 802          _mesa_TexParameteri(target, GL_TEXTURE_BASE_LEVEL, obj->BaseLevel);
 803          if (target != GL_TEXTURE_RECTANGLE_ARB)
 804             _mesa_TexParameteri(target, GL_TEXTURE_MAX_LEVEL, obj->MaxLevel);
 805          if (ctx->Extensions.EXT_texture_filter_anisotropic) {
 806             _mesa_TexParameterf(target, GL_TEXTURE_MAX_ANISOTROPY_EXT,
 807                                 samp->MaxAnisotropy);
 808          }
 809          if (ctx->Extensions.ARB_shadow) {
 810             _mesa_TexParameteri(target, GL_TEXTURE_COMPARE_MODE,
 811                                 samp->CompareMode);
 812             _mesa_TexParameteri(target, GL_TEXTURE_COMPARE_FUNC,
 813                                 samp->CompareFunc);
 814          }
 815          if (ctx->Extensions.ARB_depth_texture)
 816             _mesa_TexParameteri(target, GL_DEPTH_TEXTURE_MODE, obj->DepthMode);
 817       }
 818
 819       /* remove saved references to the texture objects */
 820       for (tgt = 0; tgt < NUM_TEXTURE_TARGETS; tgt++) {
 821          _mesa_reference_texobj(&texstate->SavedTexRef[u][tgt], NULL);
 822       }
 823    }
 824
 825    _mesa_ActiveTexture(GL_TEXTURE0_ARB + texstate->Texture.CurrentUnit);
 826
 827    _mesa_reference_shared_state(ctx, &texstate->SharedRef, NULL);
 828
 829    _mesa_unlock_context_textures(ctx);
 830 }
 831
 832
 833 /*
 834  * This function is kind of long just because we have to call a lot
 835  * of device driver functions to update device driver state.
 836  *
 837  * XXX As it is now, most of the pop-code calls immediate-mode Mesa functions
 838  * in order to restore GL state.  This isn't terribly efficient but it
 839  * ensures that dirty flags and any derived state gets updated correctly.
 840  * We could at least check if the value to restore equals the current value
 841  * and then skip the Mesa call.
 842  */
 843 void GLAPIENTRY
 844 _mesa_PopAttrib(void)
 845 {
 846    struct gl_attrib_node *attr, *next;
 847    GET_CURRENT_CONTEXT(ctx);
 848    FLUSH_VERTICES(ctx, 0);
 849
 850    if (ctx->AttribStackDepth == 0) {
 851       _mesa_error( ctx, GL_STACK_UNDERFLOW, "glPopAttrib" );
 852       return;
 853    }
 854
 855    ctx->AttribStackDepth--;
 856    attr = ctx->AttribStack[ctx->AttribStackDepth];
 857
 858    while (attr) {
 859
 860       if (MESA_VERBOSE & VERBOSE_API) {
 861          _mesa_debug(ctx, "glPopAttrib %s\n",
 862                      _mesa_lookup_enum_by_nr(attr->kind));
 863       }
 864
 865       switch (attr->kind) {
 866          case GL_ACCUM_BUFFER_BIT:
 867             {
 868                const struct gl_accum_attrib *accum;
 869                accum = (const struct gl_accum_attrib *) attr->data;
 870                _mesa_ClearAccum(accum->ClearColor[0],
 871                                 accum->ClearColor[1],
 872                                 accum->ClearColor[2],
 873                                 accum->ClearColor[3]);
 874             }
 875             break;
 876          case GL_COLOR_BUFFER_BIT:
 877             {
 878                const struct gl_colorbuffer_attrib *color;
 879
 880                color = (const struct gl_colorbuffer_attrib *) attr->data;
 881                _mesa_ClearIndex((GLfloat) color->ClearIndex);
 882                _mesa_ClearColor(color->ClearColor.f[0],
 883                                 color->ClearColor.f[1],
 884                                 color->ClearColor.f[2],
 885                                 color->ClearColor.f[3]);
 886                _mesa_IndexMask(color->IndexMask);
 887                if (!ctx->Extensions.EXT_draw_buffers2) {
 888                   _mesa_ColorMask((GLboolean) (color->ColorMask[0][0] != 0),
 889                                   (GLboolean) (color->ColorMask[0][1] != 0),
 890                                   (GLboolean) (color->ColorMask[0][2] != 0),
 891                                   (GLboolean) (color->ColorMask[0][3] != 0));
 892                }
 893                else {
 894                   GLuint i;
 895                   for (i = 0; i < ctx->Const.MaxDrawBuffers; i++) {
 896                      _mesa_ColorMaski(i,
 897                                   (GLboolean) (color->ColorMask[i][0] != 0),
 898                                   (GLboolean) (color->ColorMask[i][1] != 0),
 899                                   (GLboolean) (color->ColorMask[i][2] != 0),
 900                                   (GLboolean) (color->ColorMask[i][3] != 0));
 901                   }
 902                }
 903                {
 904                   /* Need to determine if more than one color output is
 905                    * specified.  If so, call glDrawBuffersARB, else call
 906                    * glDrawBuffer().  This is a subtle, but essential point
 907                    * since GL_FRONT (for example) is illegal for the former
 908                    * function, but legal for the later.
 909                    */
 910                   GLboolean multipleBuffers = GL_FALSE;
 911                   GLuint i;
 912
 913                   for (i = 1; i < ctx->Const.MaxDrawBuffers; i++) {
 914                      if (color->DrawBuffer[i] != GL_NONE) {
 915                         multipleBuffers = GL_TRUE;
 916                         break;
 917                      }
 918                   }
 919                   /* Call the API_level functions, not _mesa_drawbuffers()
 920                    * since we need to do error checking on the pop'd
 921                    * GL_DRAW_BUFFER.
 922                    * Ex: if GL_FRONT were pushed, but we're popping with a
 923                    * user FBO bound, GL_FRONT will be illegal and we'll need
 924                    * to record that error.  Per OpenGL ARB decision.
 925                    */
 926                   if (multipleBuffers)
 927                      _mesa_DrawBuffers(ctx->Const.MaxDrawBuffers,
 928                                           color->DrawBuffer);
 929                   else
 930                      _mesa_DrawBuffer(color->DrawBuffer[0]);
 931                }
 932                _mesa_set_enable(ctx, GL_ALPHA_TEST, color->AlphaEnabled);
 933                _mesa_AlphaFunc(color->AlphaFunc, color->AlphaRefUnclamped);
 934                if (ctx->Color.BlendEnabled != color->BlendEnabled) {
 935                   if (ctx->Extensions.EXT_draw_buffers2) {
 936                      GLuint i;
 937                      for (i = 0; i < ctx->Const.MaxDrawBuffers; i++) {
 938                         _mesa_set_enablei(ctx, GL_BLEND, i,
 939                                           (color->BlendEnabled >> i) & 1);
 940                      }
 941                   }
 942                   else {
 943                      _mesa_set_enable(ctx, GL_BLEND, (color->BlendEnabled & 1));
 944                   }
 945                }
 946                if (ctx->Color._BlendFuncPerBuffer ||
 947                    ctx->Color._BlendEquationPerBuffer) {
 948                   /* set blend per buffer */
 949                   GLuint buf;
 950                   for (buf = 0; buf < ctx->Const.MaxDrawBuffers; buf++) {
 951                      _mesa_BlendFuncSeparateiARB(buf, color->Blend[buf].SrcRGB,
 952                                               color->Blend[buf].DstRGB,
 953                                               color->Blend[buf].SrcA,
 954                                               color->Blend[buf].DstA);
 955                      _mesa_BlendEquationSeparateiARB(buf,
 956                                                   color->Blend[buf].EquationRGB,
 957                                                   color->Blend[buf].EquationA);
 958                   }
 959                }
 960                else {
 961                   /* set same blend modes for all buffers */
 962                   _mesa_BlendFuncSeparate(color->Blend[0].SrcRGB,
 963                                              color->Blend[0].DstRGB,
 964                                              color->Blend[0].SrcA,
 965                                              color->Blend[0].DstA);
 966                   /* This special case is because glBlendEquationSeparateEXT
 967                    * cannot take GL_LOGIC_OP as a parameter.
 968                    */
 969                   if (color->Blend[0].EquationRGB ==
 970                       color->Blend[0].EquationA) {
 971                      _mesa_BlendEquation(color->Blend[0].EquationRGB);
 972                   }
 973                   else {
 974                      _mesa_BlendEquationSeparate(
 975                                                  color->Blend[0].EquationRGB,
 976                                                  color->Blend[0].EquationA);
 977                   }
 978                }
 979                _mesa_BlendColor(color->BlendColorUnclamped[0],
 980                                 color->BlendColorUnclamped[1],
 981                                 color->BlendColorUnclamped[2],
 982                                 color->BlendColorUnclamped[3]);
 983                _mesa_LogicOp(color->LogicOp);
 984                _mesa_set_enable(ctx, GL_COLOR_LOGIC_OP,
 985                                 color->ColorLogicOpEnabled);
 986                _mesa_set_enable(ctx, GL_INDEX_LOGIC_OP,
 987                                 color->IndexLogicOpEnabled);
 988                _mesa_set_enable(ctx, GL_DITHER, color->DitherFlag);
 989                if (ctx->Extensions.ARB_color_buffer_float)
 990                   _mesa_ClampColor(GL_CLAMP_FRAGMENT_COLOR_ARB,
 991                                    color->ClampFragmentColor);
 992                _mesa_ClampColor(GL_CLAMP_READ_COLOR_ARB, color->ClampReadColor);
 993
 994                /* GL_ARB_framebuffer_sRGB / GL_EXT_framebuffer_sRGB */
 995                if (ctx->Extensions.EXT_framebuffer_sRGB)
 996                   _mesa_set_enable(ctx, GL_FRAMEBUFFER_SRGB, color->sRGBEnabled);
 997             }
 998             break;
 999          case GL_CURRENT_BIT:
1000             FLUSH_CURRENT( ctx, 0 );
1001             memcpy( &ctx->Current, attr->data,
1002                     sizeof(struct gl_current_attrib) );
1003             break;
1004          case GL_DEPTH_BUFFER_BIT:
1005             {
1006                const struct gl_depthbuffer_attrib *depth;
1007                depth = (const struct gl_depthbuffer_attrib *) attr->data;
1008                _mesa_DepthFunc(depth->Func);
1009                _mesa_ClearDepth(depth->Clear);
1010                _mesa_set_enable(ctx, GL_DEPTH_TEST, depth->Test);
1011                _mesa_DepthMask(depth->Mask);
1012             }
1013             break;
1014          case GL_ENABLE_BIT:
1015             {
1016                const struct gl_enable_attrib *enable;
1017                enable = (const struct gl_enable_attrib *) attr->data;
1018                pop_enable_group(ctx, enable);
1019                ctx->NewState |= _NEW_ALL;
1020             }
1021             break;
1022          case GL_EVAL_BIT:
1023             memcpy( &ctx->Eval, attr->data, sizeof(struct gl_eval_attrib) );
1024             ctx->NewState |= _NEW_EVAL;
1025             break;
1026          case GL_FOG_BIT:
1027             {
1028                const struct gl_fog_attrib *fog;
1029                fog = (const struct gl_fog_attrib *) attr->data;
1030                _mesa_set_enable(ctx, GL_FOG, fog->Enabled);
1031                _mesa_Fogfv(GL_FOG_COLOR, fog->Color);
1032                _mesa_Fogf(GL_FOG_DENSITY, fog->Density);
1033                _mesa_Fogf(GL_FOG_START, fog->Start);
1034                _mesa_Fogf(GL_FOG_END, fog->End);
1035                _mesa_Fogf(GL_FOG_INDEX, fog->Index);
1036                _mesa_Fogi(GL_FOG_MODE, fog->Mode);
1037             }
1038             break;
1039          case GL_HINT_BIT:
1040             {
1041                const struct gl_hint_attrib *hint;
1042                hint = (const struct gl_hint_attrib *) attr->data;
1043                _mesa_Hint(GL_PERSPECTIVE_CORRECTION_HINT,
1044                           hint->PerspectiveCorrection );
1045                _mesa_Hint(GL_POINT_SMOOTH_HINT, hint->PointSmooth);
1046                _mesa_Hint(GL_LINE_SMOOTH_HINT, hint->LineSmooth);
1047                _mesa_Hint(GL_POLYGON_SMOOTH_HINT, hint->PolygonSmooth);
1048                _mesa_Hint(GL_FOG_HINT, hint->Fog);
1049                _mesa_Hint(GL_CLIP_VOLUME_CLIPPING_HINT_EXT,
1050                           hint->ClipVolumeClipping);
1051                _mesa_Hint(GL_TEXTURE_COMPRESSION_HINT_ARB,
1052                           hint->TextureCompression);
1053             }
1054             break;
1055          case GL_LIGHTING_BIT:
1056             {
1057                GLuint i;
1058                const struct gl_light_attrib *light;
1059                light = (const struct gl_light_attrib *) attr->data;
1060                /* lighting enable */
1061                _mesa_set_enable(ctx, GL_LIGHTING, light->Enabled);
1062                /* per-light state */
1063                if (_math_matrix_is_dirty(ctx->ModelviewMatrixStack.Top))
1064                   _math_matrix_analyse( ctx->ModelviewMatrixStack.Top );
1065
1066                for (i = 0; i < ctx->Const.MaxLights; i++) {
1067                   const struct gl_light *l = &light->Light[i];
1068                   _mesa_set_enable(ctx, GL_LIGHT0 + i, l->Enabled);
1069                   _mesa_light(ctx, i, GL_AMBIENT, l->Ambient);
1070                   _mesa_light(ctx, i, GL_DIFFUSE, l->Diffuse);
1071                   _mesa_light(ctx, i, GL_SPECULAR, l->Specular );
1072                   _mesa_light(ctx, i, GL_POSITION, l->EyePosition);
1073                   _mesa_light(ctx, i, GL_SPOT_DIRECTION, l->SpotDirection);
1074                   {
1075                      GLfloat p[4] = { 0 };
1076                      p[0] = l->SpotExponent;
1077                      _mesa_light(ctx, i, GL_SPOT_EXPONENT, p);
1078                   }
1079                   {
1080                      GLfloat p[4] = { 0 };
1081                      p[0] = l->SpotCutoff;
1082                      _mesa_light(ctx, i, GL_SPOT_CUTOFF, p);
1083                   }
1084                   {
1085                      GLfloat p[4] = { 0 };
1086                      p[0] = l->ConstantAttenuation;
1087                      _mesa_light(ctx, i, GL_CONSTANT_ATTENUATION, p);
1088                   }
1089                   {
1090                      GLfloat p[4] = { 0 };
1091                      p[0] = l->LinearAttenuation;
1092                      _mesa_light(ctx, i, GL_LINEAR_ATTENUATION, p);
1093                   }
1094                   {
1095                      GLfloat p[4] = { 0 };
1096                      p[0] = l->QuadraticAttenuation;
1097                      _mesa_light(ctx, i, GL_QUADRATIC_ATTENUATION, p);
1098                   }
1099                }
1100                /* light model */
1101                _mesa_LightModelfv(GL_LIGHT_MODEL_AMBIENT,
1102                                   light->Model.Ambient);
1103                _mesa_LightModelf(GL_LIGHT_MODEL_LOCAL_VIEWER,
1104                                  (GLfloat) light->Model.LocalViewer);
1105                _mesa_LightModelf(GL_LIGHT_MODEL_TWO_SIDE,
1106                                  (GLfloat) light->Model.TwoSide);
1107                _mesa_LightModelf(GL_LIGHT_MODEL_COLOR_CONTROL,
1108                                  (GLfloat) light->Model.ColorControl);
1109                /* shade model */
1110                _mesa_ShadeModel(light->ShadeModel);
1111                /* color material */
1112                _mesa_ColorMaterial(light->ColorMaterialFace,
1113                                    light->ColorMaterialMode);
1114                _mesa_set_enable(ctx, GL_COLOR_MATERIAL,
1115                                 light->ColorMaterialEnabled);
1116                /* materials */
1117                memcpy(&ctx->Light.Material, &light->Material,
1118                       sizeof(struct gl_material));
1119                if (ctx->Extensions.ARB_color_buffer_float) {
1120                   _mesa_ClampColor(GL_CLAMP_VERTEX_COLOR_ARB,
1121                                    light->ClampVertexColor);
1122                }
1123             }
1124             break;
1125          case GL_LINE_BIT:
1126             {
1127                const struct gl_line_attrib *line;
1128                line = (const struct gl_line_attrib *) attr->data;
1129                _mesa_set_enable(ctx, GL_LINE_SMOOTH, line->SmoothFlag);
1130                _mesa_set_enable(ctx, GL_LINE_STIPPLE, line->StippleFlag);
1131                _mesa_LineStipple(line->StippleFactor, line->StipplePattern);
1132                _mesa_LineWidth(line->Width);
1133             }
1134             break;
1135          case GL_LIST_BIT:
1136             memcpy( &ctx->List, attr->data, sizeof(struct gl_list_attrib) );
1137             break;
1138          case GL_PIXEL_MODE_BIT:
1139             memcpy( &ctx->Pixel, attr->data, sizeof(struct gl_pixel_attrib) );
1140             /* XXX what other pixel state needs to be set by function calls? */
1141             _mesa_ReadBuffer(ctx->Pixel.ReadBuffer);
1142             ctx->NewState |= _NEW_PIXEL;
1143             break;
1144          case GL_POINT_BIT:
1145             {
1146                const struct gl_point_attrib *point;
1147                point = (const struct gl_point_attrib *) attr->data;
1148                _mesa_PointSize(point->Size);
1149                _mesa_set_enable(ctx, GL_POINT_SMOOTH, point->SmoothFlag);
1150                if (ctx->Extensions.EXT_point_parameters) {
1151                   _mesa_PointParameterfv(GL_DISTANCE_ATTENUATION_EXT,
1152                                          point->Params);
1153                   _mesa_PointParameterf(GL_POINT_SIZE_MIN_EXT,
1154                                         point->MinSize);
1155                   _mesa_PointParameterf(GL_POINT_SIZE_MAX_EXT,
1156                                         point->MaxSize);
1157                   _mesa_PointParameterf(GL_POINT_FADE_THRESHOLD_SIZE_EXT,
1158                                         point->Threshold);
1159                }
1160                if (ctx->Extensions.NV_point_sprite
1161                    || ctx->Extensions.ARB_point_sprite) {
1162                   GLuint u;
1163                   for (u = 0; u < ctx->Const.MaxTextureUnits; u++) {
1164                      _mesa_TexEnvi(GL_POINT_SPRITE_NV, GL_COORD_REPLACE_NV,
1165                                    (GLint) point->CoordReplace[u]);
1166                   }
1167                   _mesa_set_enable(ctx, GL_POINT_SPRITE_NV,point->PointSprite);
1168                   if (ctx->Extensions.NV_point_sprite)
1169                      _mesa_PointParameteri(GL_POINT_SPRITE_R_MODE_NV,
1170                                            ctx->Point.SpriteRMode);
1171
1172                   if ((ctx->API == API_OPENGL_COMPAT && ctx->Version >= 20)
1173                       || ctx->API == API_OPENGL_CORE)
1174                      _mesa_PointParameterf(GL_POINT_SPRITE_COORD_ORIGIN,
1175                                            (GLfloat)ctx->Point.SpriteOrigin);
1176                }
1177             }
1178             break;
1179          case GL_POLYGON_BIT:
1180             {
1181                const struct gl_polygon_attrib *polygon;
1182                polygon = (const struct gl_polygon_attrib *) attr->data;
1183                _mesa_CullFace(polygon->CullFaceMode);
1184                _mesa_FrontFace(polygon->FrontFace);
1185                _mesa_PolygonMode(GL_FRONT, polygon->FrontMode);
1186                _mesa_PolygonMode(GL_BACK, polygon->BackMode);
1187                _mesa_PolygonOffset(polygon->OffsetFactor,
1188                                    polygon->OffsetUnits);
1189                _mesa_set_enable(ctx, GL_POLYGON_SMOOTH, polygon->SmoothFlag);
1190                _mesa_set_enable(ctx, GL_POLYGON_STIPPLE, polygon->StippleFlag);
1191                _mesa_set_enable(ctx, GL_CULL_FACE, polygon->CullFlag);
1192                _mesa_set_enable(ctx, GL_POLYGON_OFFSET_POINT,
1193                                 polygon->OffsetPoint);
1194                _mesa_set_enable(ctx, GL_POLYGON_OFFSET_LINE,
1195                                 polygon->OffsetLine);
1196                _mesa_set_enable(ctx, GL_POLYGON_OFFSET_FILL,
1197                                 polygon->OffsetFill);
1198             }
1199             break;
1200          case GL_POLYGON_STIPPLE_BIT:
1201             memcpy( ctx->PolygonStipple, attr->data, 32*sizeof(GLuint) );
1202             ctx->NewState |= _NEW_POLYGONSTIPPLE;
1203             if (ctx->Driver.PolygonStipple)
1204                ctx->Driver.PolygonStipple( ctx, (const GLubyte *) attr->data );
1205             break;
1206          case GL_SCISSOR_BIT:
1207             {
1208                const struct gl_scissor_attrib *scissor;
1209                scissor = (const struct gl_scissor_attrib *) attr->data;
1210                _mesa_Scissor(scissor->X, scissor->Y,
1211                              scissor->Width, scissor->Height);
1212                _mesa_set_enable(ctx, GL_SCISSOR_TEST, scissor->Enabled);
1213             }
1214             break;
1215          case GL_STENCIL_BUFFER_BIT:
1216             {
1217                const struct gl_stencil_attrib *stencil;
1218                stencil = (const struct gl_stencil_attrib *) attr->data;
1219                _mesa_set_enable(ctx, GL_STENCIL_TEST, stencil->Enabled);
1220                _mesa_ClearStencil(stencil->Clear);
1221                if (ctx->Extensions.EXT_stencil_two_side) {
1222                   _mesa_set_enable(ctx, GL_STENCIL_TEST_TWO_SIDE_EXT,
1223                                    stencil->TestTwoSide);
1224                   _mesa_ActiveStencilFaceEXT(stencil->ActiveFace
1225                                              ? GL_BACK : GL_FRONT);
1226                }
1227                /* front state */
1228                _mesa_StencilFuncSeparate(GL_FRONT,
1229                                          stencil->Function[0],
1230                                          stencil->Ref[0],
1231                                          stencil->ValueMask[0]);
1232                _mesa_StencilMaskSeparate(GL_FRONT, stencil->WriteMask[0]);
1233                _mesa_StencilOpSeparate(GL_FRONT, stencil->FailFunc[0],
1234                                        stencil->ZFailFunc[0],
1235                                        stencil->ZPassFunc[0]);
1236                /* back state */
1237                _mesa_StencilFuncSeparate(GL_BACK,
1238                                          stencil->Function[1],
1239                                          stencil->Ref[1],
1240                                          stencil->ValueMask[1]);
1241                _mesa_StencilMaskSeparate(GL_BACK, stencil->WriteMask[1]);
1242                _mesa_StencilOpSeparate(GL_BACK, stencil->FailFunc[1],
1243                                        stencil->ZFailFunc[1],
1244                                        stencil->ZPassFunc[1]);
1245             }
1246             break;
1247          case GL_TRANSFORM_BIT:
1248             {
1249                GLuint i;
1250                const struct gl_transform_attrib *xform;
1251                xform = (const struct gl_transform_attrib *) attr->data;
1252                _mesa_MatrixMode(xform->MatrixMode);
1253                if (_math_matrix_is_dirty(ctx->ProjectionMatrixStack.Top))
1254                   _math_matrix_analyse( ctx->ProjectionMatrixStack.Top );
1255
1256                /* restore clip planes */
1257                for (i = 0; i < ctx->Const.MaxClipPlanes; i++) {
1258                   const GLuint mask = 1 << i;
1259                   const GLfloat *eyePlane = xform->EyeUserPlane[i];
1260                   COPY_4V(ctx->Transform.EyeUserPlane[i], eyePlane);
1261                   _mesa_set_enable(ctx, GL_CLIP_PLANE0 + i,
1262                                    !!(xform->ClipPlanesEnabled & mask));
1263                   if (ctx->Driver.ClipPlane)
1264                      ctx->Driver.ClipPlane( ctx, GL_CLIP_PLANE0 + i, eyePlane );
1265                }
1266
1267                /* normalize/rescale */
1268                if (xform->Normalize != ctx->Transform.Normalize)
1269                   _mesa_set_enable(ctx, GL_NORMALIZE,ctx->Transform.Normalize);
1270                if (xform->RescaleNormals != ctx->Transform.RescaleNormals)
1271                   _mesa_set_enable(ctx, GL_RESCALE_NORMAL_EXT,
1272                                    ctx->Transform.RescaleNormals);
1273                if (xform->DepthClamp != ctx->Transform.DepthClamp)
1274                   _mesa_set_enable(ctx, GL_DEPTH_CLAMP,
1275                                    ctx->Transform.DepthClamp);
1276             }
1277             break;
1278          case GL_TEXTURE_BIT:
1279             {
1280                struct texture_state *texstate
1281                   = (struct texture_state *) attr->data;
1282                pop_texture_group(ctx, texstate);
1283                ctx->NewState |= _NEW_TEXTURE;
1284             }
1285             break;
1286          case GL_VIEWPORT_BIT:
1287             {
1288                const struct gl_viewport_attrib *vp;
1289                vp = (const struct gl_viewport_attrib *) attr->data;
1290                _mesa_Viewport(vp->X, vp->Y, vp->Width, vp->Height);
1291                _mesa_DepthRange(vp->Near, vp->Far);
1292             }
1293             break;
1294          case GL_MULTISAMPLE_BIT_ARB:
1295             {
1296                const struct gl_multisample_attrib *ms;
1297                ms = (const struct gl_multisample_attrib *) attr->data;
1298
1299                TEST_AND_UPDATE(ctx->Multisample.Enabled,
1300                                ms->Enabled,
1301                                GL_MULTISAMPLE);
1302
1303                TEST_AND_UPDATE(ctx->Multisample.SampleCoverage,
1304                                ms->SampleCoverage,
1305                                GL_SAMPLE_COVERAGE);
1306
1307                TEST_AND_UPDATE(ctx->Multisample.SampleAlphaToCoverage,
1308                                ms->SampleAlphaToCoverage,
1309                                GL_SAMPLE_ALPHA_TO_COVERAGE);
1310
1311                TEST_AND_UPDATE(ctx->Multisample.SampleAlphaToOne,
1312                                ms->SampleAlphaToOne,
1313                                GL_SAMPLE_ALPHA_TO_ONE);
1314
1315                _mesa_SampleCoverage(ms->SampleCoverageValue,
1316                                        ms->SampleCoverageInvert);
1317             }
1318             break;
1319
1320          default:
1321             _mesa_problem( ctx, "Bad attrib flag in PopAttrib");
1322             break;
1323       }
1324
1325       next = attr->next;
1326       free(attr->data);
1327       free(attr);
1328       attr = next;
1329    }
1330 }
1331
1332
1333 /**
1334  * Copy gl_pixelstore_attrib from src to dst, updating buffer
1335  * object refcounts.
1336  */
1337 static void
1338 copy_pixelstore(struct gl_context *ctx,
1339                 struct gl_pixelstore_attrib *dst,
1340                 const struct gl_pixelstore_attrib *src)
1341 {
1342    dst->Alignment = src->Alignment;
1343    dst->RowLength = src->RowLength;
1344    dst->SkipPixels = src->SkipPixels;
1345    dst->SkipRows = src->SkipRows;
1346    dst->ImageHeight = src->ImageHeight;
1347    dst->SkipImages = src->SkipImages;
1348    dst->SwapBytes = src->SwapBytes;
1349    dst->LsbFirst = src->LsbFirst;
1350    dst->Invert = src->Invert;
1351    _mesa_reference_buffer_object(ctx, &dst->BufferObj, src->BufferObj);
1352 }
1353
1354
1355 #define GL_CLIENT_PACK_BIT (1<<20)
1356 #define GL_CLIENT_UNPACK_BIT (1<<21)
1357
1358 /**
1359  * Copy gl_array_object from src to dest.
1360  * 'dest' must be in an initialized state.
1361  */
1362 static void
1363 copy_array_object(struct gl_context *ctx,
1364                   struct gl_array_object *dest,
1365                   struct gl_array_object *src)
1366 {
1367    GLuint i;
1368
1369    /* skip Name */
1370    /* skip RefCount */
1371
1372    /* In theory must be the same anyway, but on recreate make sure it matches */
1373    dest->ARBsemantics = src->ARBsemantics;
1374
1375    for (i = 0; i < Elements(src->VertexAttrib); i++)
1376       _mesa_copy_client_array(ctx, &dest->VertexAttrib[i], &src->VertexAttrib[i]);
1377
1378    /* _Enabled must be the same than on push */
1379    dest->_Enabled = src->_Enabled;
1380    dest->_MaxElement = src->_MaxElement;
1381 }
1382
1383 /**
1384  * Copy gl_array_attrib from src to dest.
1385  * 'dest' must be in an initialized state.
1386  */
1387 static void
1388 copy_array_attrib(struct gl_context *ctx,
1389                   struct gl_array_attrib *dest,
1390                   struct gl_array_attrib *src,
1391                   bool vbo_deleted)
1392 {
1393    /* skip ArrayObj */
1394    /* skip DefaultArrayObj, Objects */
1395    dest->ActiveTexture = src->ActiveTexture;
1396    dest->LockFirst = src->LockFirst;
1397    dest->LockCount = src->LockCount;
1398    dest->PrimitiveRestart = src->PrimitiveRestart;
1399    dest->PrimitiveRestartFixedIndex = src->PrimitiveRestartFixedIndex;
1400    dest->_PrimitiveRestart = src->_PrimitiveRestart;
1401    dest->RestartIndex = src->RestartIndex;
1402    dest->_RestartIndex = src->_RestartIndex;
1403    /* skip NewState */
1404    /* skip RebindArrays */
1405
1406    if (!vbo_deleted)
1407       copy_array_object(ctx, dest->ArrayObj, src->ArrayObj);
1408
1409    /* skip ArrayBufferObj */
1410    /* skip ElementArrayBufferObj */
1411 }
1412
1413 /**
1414  * Save the content of src to dest.
1415  */
1416 static void
1417 save_array_attrib(struct gl_context *ctx,
1418                   struct gl_array_attrib *dest,
1419                   struct gl_array_attrib *src)
1420 {
1421    /* Set the Name, needed for restore, but do never overwrite.
1422     * Needs to match value in the object hash. */
1423    dest->ArrayObj->Name = src->ArrayObj->Name;
1424    /* And copy all of the rest. */
1425    copy_array_attrib(ctx, dest, src, false);
1426
1427    /* Just reference them here */
1428    _mesa_reference_buffer_object(ctx, &dest->ArrayBufferObj,
1429                                  src->ArrayBufferObj);
1430    _mesa_reference_buffer_object(ctx, &dest->ArrayObj->ElementArrayBufferObj,
1431                                  src->ArrayObj->ElementArrayBufferObj);
1432 }
1433
1434 /**
1435  * Restore the content of src to dest.
1436  */
1437 static void
1438 restore_array_attrib(struct gl_context *ctx,
1439                      struct gl_array_attrib *dest,
1440                      struct gl_array_attrib *src)
1441 {
1442    /* The ARB_vertex_array_object spec says:
1443     *
1444     *     "BindVertexArray fails and an INVALID_OPERATION error is generated
1445     *     if array is not a name returned from a previous call to
1446     *     GenVertexArrays, or if such a name has since been deleted with
1447     *     DeleteVertexArrays."
1448     *
1449     * Therefore popping a deleted VAO cannot magically recreate it.
1450     *
1451     * The semantics of objects created using APPLE_vertex_array_objects behave
1452     * differently.  These objects expect to be recreated by pop.  Alas.
1453     */
1454    const bool arb_vao = (src->ArrayObj->Name != 0
1455                          && src->ArrayObj->ARBsemantics);
1456
1457    if (arb_vao && !_mesa_IsVertexArray(src->ArrayObj->Name))
1458       return;
1459
1460    _mesa_BindVertexArrayAPPLE(src->ArrayObj->Name);
1461
1462    /* Restore or recreate the buffer objects by the names ... */
1463    if (!arb_vao
1464        || src->ArrayBufferObj->Name == 0
1465        || _mesa_IsBuffer(src->ArrayBufferObj->Name)) {
1466       /* ... and restore its content */
1467       copy_array_attrib(ctx, dest, src, false);
1468
1469       _mesa_BindBuffer(GL_ARRAY_BUFFER_ARB,
1470                           src->ArrayBufferObj->Name);
1471    } else {
1472       copy_array_attrib(ctx, dest, src, true);
1473    }
1474
1475    if (!arb_vao
1476        || src->ArrayObj->ElementArrayBufferObj->Name == 0
1477        || _mesa_IsBuffer(src->ArrayObj->ElementArrayBufferObj->Name))
1478       _mesa_BindBuffer(GL_ELEMENT_ARRAY_BUFFER_ARB,
1479                           src->ArrayObj->ElementArrayBufferObj->Name);
1480 }
1481
1482 /**
1483  * init/alloc the fields of 'attrib'.
1484  * Needs to the init part matching free_array_attrib_data below.
1485  */
1486 static void
1487 init_array_attrib_data(struct gl_context *ctx,
1488                        struct gl_array_attrib *attrib)
1489 {
1490    /* Get a non driver gl_array_object. */
1491    attrib->ArrayObj = CALLOC_STRUCT( gl_array_object );
1492    _mesa_initialize_array_object(ctx, attrib->ArrayObj, 0);
1493 }
1494
1495 /**
1496  * Free/unreference the fields of 'attrib' but don't delete it (that's
1497  * done later in the calling code).
1498  * Needs to the cleanup part matching init_array_attrib_data above.
1499  */
1500 static void
1501 free_array_attrib_data(struct gl_context *ctx,
1502                        struct gl_array_attrib *attrib)
1503 {
1504    /* We use a non driver array object, so don't just unref since we would
1505     * end up using the drivers DeleteArrayObject function for deletion. */
1506    _mesa_delete_array_object(ctx, attrib->ArrayObj);
1507    attrib->ArrayObj = 0;
1508    _mesa_reference_buffer_object(ctx, &attrib->ArrayBufferObj, NULL);
1509 }
1510
1511
1512 void GLAPIENTRY
1513 _mesa_PushClientAttrib(GLbitfield mask)
1514 {
1515    struct gl_attrib_node *head;
1516
1517    GET_CURRENT_CONTEXT(ctx);
1518
1519    if (ctx->ClientAttribStackDepth >= MAX_CLIENT_ATTRIB_STACK_DEPTH) {
1520       _mesa_error( ctx, GL_STACK_OVERFLOW, "glPushClientAttrib" );
1521       return;
1522    }
1523
1524    /* Build linked list of attribute nodes which save all attribute
1525     * groups specified by the mask.
1526     */
1527    head = NULL;
1528
1529    if (mask & GL_CLIENT_PIXEL_STORE_BIT) {
1530       struct gl_pixelstore_attrib *attr;
1531       /* packing attribs */
1532       attr = CALLOC_STRUCT( gl_pixelstore_attrib );
1533       copy_pixelstore(ctx, attr, &ctx->Pack);
1534       save_attrib_data(&head, GL_CLIENT_PACK_BIT, attr);
1535       /* unpacking attribs */
1536       attr = CALLOC_STRUCT( gl_pixelstore_attrib );
1537       copy_pixelstore(ctx, attr, &ctx->Unpack);
1538       save_attrib_data(&head, GL_CLIENT_UNPACK_BIT, attr);
1539    }
1540
1541    if (mask & GL_CLIENT_VERTEX_ARRAY_BIT) {
1542       struct gl_array_attrib *attr;
1543       attr = CALLOC_STRUCT( gl_array_attrib );
1544       init_array_attrib_data(ctx, attr);
1545       save_array_attrib(ctx, attr, &ctx->Array);
1546       save_attrib_data(&head, GL_CLIENT_VERTEX_ARRAY_BIT, attr);
1547    }
1548
1549    ctx->ClientAttribStack[ctx->ClientAttribStackDepth] = head;
1550    ctx->ClientAttribStackDepth++;
1551 }
1552
1553
1554
1555
1556 void GLAPIENTRY
1557 _mesa_PopClientAttrib(void)
1558 {
1559    struct gl_attrib_node *node, *next;
1560
1561    GET_CURRENT_CONTEXT(ctx);
1562    FLUSH_VERTICES(ctx, 0);
1563
1564    if (ctx->ClientAttribStackDepth == 0) {
1565       _mesa_error( ctx, GL_STACK_UNDERFLOW, "glPopClientAttrib" );
1566       return;
1567    }
1568
1569    ctx->ClientAttribStackDepth--;
1570    node = ctx->ClientAttribStack[ctx->ClientAttribStackDepth];
1571
1572    while (node) {
1573       switch (node->kind) {
1574          case GL_CLIENT_PACK_BIT:
1575             {
1576                struct gl_pixelstore_attrib *store =
1577                   (struct gl_pixelstore_attrib *) node->data;
1578                copy_pixelstore(ctx, &ctx->Pack, store);
1579                _mesa_reference_buffer_object(ctx, &store->BufferObj, NULL);
1580             }
1581             ctx->NewState |= _NEW_PACKUNPACK;
1582             break;
1583          case GL_CLIENT_UNPACK_BIT:
1584             {
1585                struct gl_pixelstore_attrib *store =
1586                   (struct gl_pixelstore_attrib *) node->data;
1587                copy_pixelstore(ctx, &ctx->Unpack, store);
1588                _mesa_reference_buffer_object(ctx, &store->BufferObj, NULL);
1589             }
1590             ctx->NewState |= _NEW_PACKUNPACK;
1591             break;
1592          case GL_CLIENT_VERTEX_ARRAY_BIT: {
1593             struct gl_array_attrib * attr =
1594               (struct gl_array_attrib *) node->data;
1595             restore_array_attrib(ctx, &ctx->Array, attr);
1596             free_array_attrib_data(ctx, attr);
1597             ctx->NewState |= _NEW_ARRAY;
1598             break;
1599          }
1600          default:
1601             _mesa_problem( ctx, "Bad attrib flag in PopClientAttrib");
1602             break;
1603       }
1604
1605       next = node->next;
1606       free(node->data);
1607       free(node);
1608       node = next;
1609    }
1610 }
1611
1612
1613 /**
1614  * Free any attribute state data that might be attached to the context.
1615  */
1616 void
1617 _mesa_free_attrib_data(struct gl_context *ctx)
1618 {
1619    while (ctx->AttribStackDepth > 0) {
1620       struct gl_attrib_node *attr, *next;
1621
1622       ctx->AttribStackDepth--;
1623       attr = ctx->AttribStack[ctx->AttribStackDepth];
1624
1625       while (attr) {
1626          if (attr->kind == GL_TEXTURE_BIT) {
1627             struct texture_state *texstate = (struct texture_state*)attr->data;
1628             GLuint u, tgt;
1629             /* clear references to the saved texture objects */
1630             for (u = 0; u < ctx->Const.MaxTextureUnits; u++) {
1631                for (tgt = 0; tgt < NUM_TEXTURE_TARGETS; tgt++) {
1632                   _mesa_reference_texobj(&texstate->SavedTexRef[u][tgt], NULL);
1633                }
1634             }
1635             _mesa_reference_shared_state(ctx, &texstate->SharedRef, NULL);
1636          }
1637          else {
1638             /* any other chunks of state that requires special handling? */
1639          }
1640
1641          next = attr->next;
1642          free(attr->data);
1643          free(attr);
1644          attr = next;
1645       }
1646    }
1647 }
1648
1649
1650 void _mesa_init_attrib( struct gl_context *ctx )
1651 {
1652    /* Renderer and client attribute stacks */
1653    ctx->AttribStackDepth = 0;
1654    ctx->ClientAttribStackDepth = 0;
1655 }