src/mesa/main/state.c

   1 /*
   2  * Mesa 3-D graphics library
   3  * Version:  7.1
   4  *
   5  * Copyright (C) 1999-2008  Brian Paul   All Rights Reserved.
   6  *
   7  * Permission is hereby granted, free of charge, to any person obtaining a
   8  * copy of this software and associated documentation files (the "Software"),
   9  * to deal in the Software without restriction, including without limitation
  10  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  11  * and/or sell copies of the Software, and to permit persons to whom the
  12  * Software is furnished to do so, subject to the following conditions:
  13  *
  14  * The above copyright notice and this permission notice shall be included
  15  * in all copies or substantial portions of the Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  18  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  20  * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  21  * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  22  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  23  */
  24
  25
  26 /**
  27  * \file state.c
  28  * State management.
  29  *
  30  * This file manages recalculation of derived values in GLcontext.
  31  */
  32
  33
  34 #include "glheader.h"
  35 #include "mtypes.h"
  36 #include "context.h"
  37 #include "debug.h"
  38 #include "macros.h"
  39 #include "ffvertex_prog.h"
  40 #include "framebuffer.h"
  41 #include "light.h"
  42 #include "matrix.h"
  43 #if FEATURE_pixel_transfer
  44 #include "pixel.h"
  45 #endif
  46 #include "shader/program.h"
  47 #include "state.h"
  48 #include "stencil.h"
  49 #include "texenvprogram.h"
  50 #include "texobj.h"
  51 #include "texstate.h"
  52
  53
  54
  55
  56 static void
  57 update_separate_specular(GLcontext *ctx)
  58 {
  59    if (NEED_SECONDARY_COLOR(ctx))
  60       ctx->_TriangleCaps |= DD_SEPARATE_SPECULAR;
  61    else
  62       ctx->_TriangleCaps &= ~DD_SEPARATE_SPECULAR;
  63 }
  64
  65
  66 /**
  67  * Update state dependent on vertex arrays.
  68  */
  69 static void
  70 update_arrays( GLcontext *ctx )
  71 {
  72    GLuint i, min;
  73
  74    /* find min of _MaxElement values for all enabled arrays */
  75
  76    /* 0 */
  77    if (ctx->VertexProgram._Current
  78        && ctx->Array.ArrayObj->VertexAttrib[VERT_ATTRIB_POS].Enabled) {
  79       min = ctx->Array.ArrayObj->VertexAttrib[VERT_ATTRIB_POS]._MaxElement;
  80    }
  81    else if (ctx->Array.ArrayObj->Vertex.Enabled) {
  82       min = ctx->Array.ArrayObj->Vertex._MaxElement;
  83    }
  84    else {
  85       /* can't draw anything without vertex positions! */
  86       min = 0;
  87    }
  88
  89    /* 1 */
  90    if (ctx->VertexProgram._Enabled
  91        && ctx->Array.ArrayObj->VertexAttrib[VERT_ATTRIB_WEIGHT].Enabled) {
  92       min = MIN2(min, ctx->Array.ArrayObj->VertexAttrib[VERT_ATTRIB_WEIGHT]._MaxElement);
  93    }
  94    /* no conventional vertex weight array */
  95
  96    /* 2 */
  97    if (ctx->VertexProgram._Enabled
  98        && ctx->Array.ArrayObj->VertexAttrib[VERT_ATTRIB_NORMAL].Enabled) {
  99       min = MIN2(min, ctx->Array.ArrayObj->VertexAttrib[VERT_ATTRIB_NORMAL]._MaxElement);
 100    }
 101    else if (ctx->Array.ArrayObj->Normal.Enabled) {
 102       min = MIN2(min, ctx->Array.ArrayObj->Normal._MaxElement);
 103    }
 104
 105    /* 3 */
 106    if (ctx->VertexProgram._Enabled
 107        && ctx->Array.ArrayObj->VertexAttrib[VERT_ATTRIB_COLOR0].Enabled) {
 108       min = MIN2(min, ctx->Array.ArrayObj->VertexAttrib[VERT_ATTRIB_COLOR0]._MaxElement);
 109    }
 110    else if (ctx->Array.ArrayObj->Color.Enabled) {
 111       min = MIN2(min, ctx->Array.ArrayObj->Color._MaxElement);
 112    }
 113
 114    /* 4 */
 115    if (ctx->VertexProgram._Enabled
 116        && ctx->Array.ArrayObj->VertexAttrib[VERT_ATTRIB_COLOR1].Enabled) {
 117       min = MIN2(min, ctx->Array.ArrayObj->VertexAttrib[VERT_ATTRIB_COLOR1]._MaxElement);
 118    }
 119    else if (ctx->Array.ArrayObj->SecondaryColor.Enabled) {
 120       min = MIN2(min, ctx->Array.ArrayObj->SecondaryColor._MaxElement);
 121    }
 122
 123    /* 5 */
 124    if (ctx->VertexProgram._Enabled
 125        && ctx->Array.ArrayObj->VertexAttrib[VERT_ATTRIB_FOG].Enabled) {
 126       min = MIN2(min, ctx->Array.ArrayObj->VertexAttrib[VERT_ATTRIB_FOG]._MaxElement);
 127    }
 128    else if (ctx->Array.ArrayObj->FogCoord.Enabled) {
 129       min = MIN2(min, ctx->Array.ArrayObj->FogCoord._MaxElement);
 130    }
 131
 132    /* 6 */
 133    if (ctx->VertexProgram._Enabled
 134        && ctx->Array.ArrayObj->VertexAttrib[VERT_ATTRIB_COLOR_INDEX].Enabled) {
 135       min = MIN2(min, ctx->Array.ArrayObj->VertexAttrib[VERT_ATTRIB_COLOR_INDEX]._MaxElement);
 136    }
 137    else if (ctx->Array.ArrayObj->Index.Enabled) {
 138       min = MIN2(min, ctx->Array.ArrayObj->Index._MaxElement);
 139    }
 140
 141
 142    /* 7 */
 143    if (ctx->VertexProgram._Enabled
 144        && ctx->Array.ArrayObj->VertexAttrib[VERT_ATTRIB_EDGEFLAG].Enabled) {
 145       min = MIN2(min, ctx->Array.ArrayObj->VertexAttrib[VERT_ATTRIB_EDGEFLAG]._MaxElement);
 146    }
 147
 148    /* 8..15 */
 149    for (i = VERT_ATTRIB_TEX0; i <= VERT_ATTRIB_TEX7; i++) {
 150       if (ctx->VertexProgram._Enabled
 151           && ctx->Array.ArrayObj->VertexAttrib[i].Enabled) {
 152          min = MIN2(min, ctx->Array.ArrayObj->VertexAttrib[i]._MaxElement);
 153       }
 154       else if (i - VERT_ATTRIB_TEX0 < ctx->Const.MaxTextureCoordUnits
 155                && ctx->Array.ArrayObj->TexCoord[i - VERT_ATTRIB_TEX0].Enabled) {
 156          min = MIN2(min, ctx->Array.ArrayObj->TexCoord[i - VERT_ATTRIB_TEX0]._MaxElement);
 157       }
 158    }
 159
 160    /* 16..31 */
 161    if (ctx->VertexProgram._Current) {
 162       for (i = VERT_ATTRIB_GENERIC0; i < VERT_ATTRIB_MAX; i++) {
 163          if (ctx->Array.ArrayObj->VertexAttrib[i].Enabled) {
 164             min = MIN2(min, ctx->Array.ArrayObj->VertexAttrib[i]._MaxElement);
 165          }
 166       }
 167    }
 168
 169    if (ctx->Array.ArrayObj->EdgeFlag.Enabled) {
 170       min = MIN2(min, ctx->Array.ArrayObj->EdgeFlag._MaxElement);
 171    }
 172
 173    /* _MaxElement is one past the last legal array element */
 174    ctx->Array._MaxElement = min;
 175 }
 176
 177
 178 static void
 179 update_program(GLcontext *ctx)
 180 {
 181    const struct gl_shader_program *shProg = ctx->Shader.CurrentProgram;
 182    const struct gl_vertex_program *prevVP = ctx->VertexProgram._Current;
 183    const struct gl_fragment_program *prevFP = ctx->FragmentProgram._Current;
 184
 185    /* These _Enabled flags indicate if the program is enabled AND valid. */
 186    ctx->VertexProgram._Enabled = ctx->VertexProgram.Enabled
 187       && ctx->VertexProgram.Current->Base.Instructions;
 188    ctx->FragmentProgram._Enabled = ctx->FragmentProgram.Enabled
 189       && ctx->FragmentProgram.Current->Base.Instructions;
 190    ctx->ATIFragmentShader._Enabled = ctx->ATIFragmentShader.Enabled
 191       && ctx->ATIFragmentShader.Current->Instructions[0];
 192
 193    /*
 194     * Set the ctx->VertexProgram._Current and ctx->FragmentProgram._Current
 195     * pointers to the programs that should be enabled/used.  These will only
 196     * be NULL if we need to use the fixed-function code.
 197     *
 198     * These programs may come from several sources.  The priority is as
 199     * follows:
 200     *   1. OpenGL 2.0/ARB vertex/fragment shaders
 201     *   2. ARB/NV vertex/fragment programs
 202     *   3. Programs derived from fixed-function state.
 203     *
 204     * Note: it's possible for a vertex shader to get used with a fragment
 205     * program (and vice versa) here, but in practice that shouldn't ever
 206     * come up, or matter.
 207     */
 208
 209    _mesa_reference_fragprog(ctx, &ctx->FragmentProgram._Current, NULL);
 210
 211    if (shProg && shProg->LinkStatus) {
 212       /* Use shader programs */
 213       /* XXX this isn't quite right, since we may have either a vertex
 214        * _or_ fragment shader (not always both).
 215        */
 216       _mesa_reference_vertprog(ctx, &ctx->VertexProgram._Current,
 217                                shProg->VertexProgram);
 218       _mesa_reference_fragprog(ctx, &ctx->FragmentProgram._Current,
 219                                shProg->FragmentProgram);
 220    }
 221    else {
 222       if (ctx->VertexProgram._Enabled) {
 223          /* use user-defined vertex program */
 224          _mesa_reference_vertprog(ctx, &ctx->VertexProgram._Current,
 225                                   ctx->VertexProgram.Current);
 226       }
 227       else if (ctx->VertexProgram._MaintainTnlProgram) {
 228          /* Use vertex program generated from fixed-function state.
 229           * The _Current pointer will get set in
 230           * _tnl_UpdateFixedFunctionProgram() later if appropriate.
 231           */
 232          _mesa_reference_vertprog(ctx, &ctx->VertexProgram._Current, NULL);
 233       }
 234       else {
 235          /* no vertex program */
 236          _mesa_reference_vertprog(ctx, &ctx->VertexProgram._Current, NULL);
 237       }
 238
 239       if (ctx->FragmentProgram._Enabled) {
 240          /* use user-defined vertex program */
 241          _mesa_reference_fragprog(ctx, &ctx->FragmentProgram._Current,
 242                                   ctx->FragmentProgram.Current);
 243       }
 244       else if (ctx->FragmentProgram._MaintainTexEnvProgram) {
 245          /* Use fragment program generated from fixed-function state.
 246           * The _Current pointer will get set in _mesa_UpdateTexEnvProgram()
 247           * later if appropriate.
 248           */
 249          _mesa_reference_fragprog(ctx, &ctx->FragmentProgram._Current, NULL);
 250       }
 251       else {
 252          /* no fragment program */
 253          _mesa_reference_fragprog(ctx, &ctx->FragmentProgram._Current, NULL);
 254       }
 255    }
 256
 257    if (ctx->VertexProgram._Current)
 258       assert(ctx->VertexProgram._Current->Base.Parameters);
 259    if (ctx->FragmentProgram._Current)
 260       assert(ctx->FragmentProgram._Current->Base.Parameters);
 261
 262
 263    ctx->FragmentProgram._Active = ctx->FragmentProgram._Enabled;
 264    if (ctx->FragmentProgram._MaintainTexEnvProgram &&
 265        !ctx->FragmentProgram._Enabled) {
 266       if (ctx->FragmentProgram._UseTexEnvProgram)
 267          ctx->FragmentProgram._Active = GL_TRUE;
 268    }
 269 }
 270
 271
 272 static void
 273 update_viewport_matrix(GLcontext *ctx)
 274 {
 275    const GLfloat depthMax = ctx->DrawBuffer->_DepthMaxF;
 276
 277    ASSERT(depthMax > 0);
 278
 279    /* Compute scale and bias values. This is really driver-specific
 280     * and should be maintained elsewhere if at all.
 281     * NOTE: RasterPos uses this.
 282     */
 283    _math_matrix_viewport(&ctx->Viewport._WindowMap,
 284                          ctx->Viewport.X, ctx->Viewport.Y,
 285                          ctx->Viewport.Width, ctx->Viewport.Height,
 286                          ctx->Viewport.Near, ctx->Viewport.Far,
 287                          depthMax);
 288 }
 289
 290
 291 /**
 292  * Update derived multisample state.
 293  */
 294 static void
 295 update_multisample(GLcontext *ctx)
 296 {
 297    ctx->Multisample._Enabled = GL_FALSE;
 298    if (ctx->DrawBuffer) {
 299       if (ctx->DrawBuffer->Visual.sampleBuffers)
 300          ctx->Multisample._Enabled = GL_TRUE;
 301    }
 302 }
 303
 304
 305 /**
 306  * Update derived color/blend/logicop state.
 307  */
 308 static void
 309 update_color(GLcontext *ctx)
 310 {
 311    /* This is needed to support 1.1's RGB logic ops AND
 312     * 1.0's blending logicops.
 313     */
 314    ctx->Color._LogicOpEnabled = RGBA_LOGICOP_ENABLED(ctx);
 315 }
 316
 317
 318 /*
 319  * Check polygon state and set DD_TRI_CULL_FRONT_BACK and/or DD_TRI_OFFSET
 320  * in ctx->_TriangleCaps if needed.
 321  */
 322 static void
 323 update_polygon(GLcontext *ctx)
 324 {
 325    ctx->_TriangleCaps &= ~(DD_TRI_CULL_FRONT_BACK | DD_TRI_OFFSET);
 326
 327    if (ctx->Polygon.CullFlag && ctx->Polygon.CullFaceMode == GL_FRONT_AND_BACK)
 328       ctx->_TriangleCaps |= DD_TRI_CULL_FRONT_BACK;
 329
 330    if (   ctx->Polygon.OffsetPoint
 331        || ctx->Polygon.OffsetLine
 332        || ctx->Polygon.OffsetFill)
 333       ctx->_TriangleCaps |= DD_TRI_OFFSET;
 334 }
 335
 336
 337 /**
 338  * Update the ctx->_TriangleCaps bitfield.
 339  * XXX that bitfield should really go away someday!
 340  * This function must be called after other update_*() functions since
 341  * there are dependencies on some other derived values.
 342  */
 343 #if 0
 344 static void
 345 update_tricaps(GLcontext *ctx, GLbitfield new_state)
 346 {
 347    ctx->_TriangleCaps = 0;
 348
 349    /*
 350     * Points
 351     */
 352    if (1/*new_state & _NEW_POINT*/) {
 353       if (ctx->Point.SmoothFlag)
 354          ctx->_TriangleCaps |= DD_POINT_SMOOTH;
 355       if (ctx->Point.Size != 1.0F)
 356          ctx->_TriangleCaps |= DD_POINT_SIZE;
 357       if (ctx->Point._Attenuated)
 358          ctx->_TriangleCaps |= DD_POINT_ATTEN;
 359    }
 360
 361    /*
 362     * Lines
 363     */
 364    if (1/*new_state & _NEW_LINE*/) {
 365       if (ctx->Line.SmoothFlag)
 366          ctx->_TriangleCaps |= DD_LINE_SMOOTH;
 367       if (ctx->Line.StippleFlag)
 368          ctx->_TriangleCaps |= DD_LINE_STIPPLE;
 369       if (ctx->Line.Width != 1.0)
 370          ctx->_TriangleCaps |= DD_LINE_WIDTH;
 371    }
 372
 373    /*
 374     * Polygons
 375     */
 376    if (1/*new_state & _NEW_POLYGON*/) {
 377       if (ctx->Polygon.SmoothFlag)
 378          ctx->_TriangleCaps |= DD_TRI_SMOOTH;
 379       if (ctx->Polygon.StippleFlag)
 380          ctx->_TriangleCaps |= DD_TRI_STIPPLE;
 381       if (ctx->Polygon.FrontMode != GL_FILL
 382           || ctx->Polygon.BackMode != GL_FILL)
 383          ctx->_TriangleCaps |= DD_TRI_UNFILLED;
 384       if (ctx->Polygon.CullFlag
 385           && ctx->Polygon.CullFaceMode == GL_FRONT_AND_BACK)
 386          ctx->_TriangleCaps |= DD_TRI_CULL_FRONT_BACK;
 387       if (ctx->Polygon.OffsetPoint ||
 388           ctx->Polygon.OffsetLine ||
 389           ctx->Polygon.OffsetFill)
 390          ctx->_TriangleCaps |= DD_TRI_OFFSET;
 391    }
 392
 393    /*
 394     * Lighting and shading
 395     */
 396    if (ctx->Light.Enabled && ctx->Light.Model.TwoSide)
 397       ctx->_TriangleCaps |= DD_TRI_LIGHT_TWOSIDE;
 398    if (ctx->Light.ShadeModel == GL_FLAT)
 399       ctx->_TriangleCaps |= DD_FLATSHADE;
 400    if (NEED_SECONDARY_COLOR(ctx))
 401       ctx->_TriangleCaps |= DD_SEPARATE_SPECULAR;
 402
 403    /*
 404     * Stencil
 405     */
 406    if (ctx->Stencil._TestTwoSide)
 407       ctx->_TriangleCaps |= DD_TRI_TWOSTENCIL;
 408 }
 409 #endif
 410
 411
 412 /**
 413  * Compute derived GL state.
 414  * If __GLcontextRec::NewState is non-zero then this function \b must
 415  * be called before rendering anything.
 416  *
 417  * Calls dd_function_table::UpdateState to perform any internal state
 418  * management necessary.
 419  *
 420  * \sa _mesa_update_modelview_project(), _mesa_update_texture(),
 421  * _mesa_update_buffer_bounds(),
 422  * _mesa_update_lighting() and _mesa_update_tnl_spaces().
 423  */
 424 void
 425 _mesa_update_state_locked( GLcontext *ctx )
 426 {
 427    GLbitfield new_state = ctx->NewState;
 428    GLbitfield prog_flags = _NEW_PROGRAM;
 429
 430    if (MESA_VERBOSE & VERBOSE_STATE)
 431       _mesa_print_state("_mesa_update_state", new_state);
 432
 433    if (new_state & (_NEW_MODELVIEW|_NEW_PROJECTION))
 434       _mesa_update_modelview_project( ctx, new_state );
 435
 436    if (new_state & (_NEW_PROGRAM|_NEW_TEXTURE|_NEW_TEXTURE_MATRIX))
 437       _mesa_update_texture( ctx, new_state );
 438
 439    if (new_state & _NEW_BUFFERS)
 440       _mesa_update_framebuffer(ctx);
 441
 442    if (new_state & (_NEW_SCISSOR | _NEW_BUFFERS | _NEW_VIEWPORT))
 443       _mesa_update_draw_buffer_bounds( ctx );
 444
 445    if (new_state & _NEW_POLYGON)
 446       update_polygon( ctx );
 447
 448    if (new_state & _NEW_LIGHT)
 449       _mesa_update_lighting( ctx );
 450
 451    if (new_state & _NEW_STENCIL)
 452       _mesa_update_stencil( ctx );
 453
 454 #if FEATURE_pixel_transfer
 455    if (new_state & _IMAGE_NEW_TRANSFER_STATE)
 456       _mesa_update_pixel( ctx, new_state );
 457 #endif
 458
 459    if (new_state & _DD_NEW_SEPARATE_SPECULAR)
 460       update_separate_specular( ctx );
 461
 462    if (new_state & (_NEW_ARRAY | _NEW_PROGRAM))
 463       update_arrays( ctx );
 464
 465    if (new_state & (_NEW_BUFFERS | _NEW_VIEWPORT))
 466       update_viewport_matrix(ctx);
 467
 468    if (new_state & _NEW_MULTISAMPLE)
 469       update_multisample( ctx );
 470
 471    if (new_state & _NEW_COLOR)
 472       update_color( ctx );
 473
 474 #if 0
 475    if (new_state & (_NEW_POINT | _NEW_LINE | _NEW_POLYGON | _NEW_LIGHT
 476                     | _NEW_STENCIL | _DD_NEW_SEPARATE_SPECULAR))
 477       update_tricaps( ctx, new_state );
 478 #endif
 479
 480    /* ctx->_NeedEyeCoords is now up to date.
 481     *
 482     * If the truth value of this variable has changed, update for the
 483     * new lighting space and recompute the positions of lights and the
 484     * normal transform.
 485     *
 486     * If the lighting space hasn't changed, may still need to recompute
 487     * light positions & normal transforms for other reasons.
 488     */
 489    if (new_state & _MESA_NEW_NEED_EYE_COORDS)
 490       _mesa_update_tnl_spaces( ctx, new_state );
 491
 492    if (ctx->FragmentProgram._MaintainTexEnvProgram) {
 493       prog_flags |= (_NEW_TEXTURE | _NEW_FOG | _DD_NEW_SEPARATE_SPECULAR);
 494    }
 495    if (ctx->VertexProgram._MaintainTnlProgram) {
 496       prog_flags |= (_NEW_ARRAY | _NEW_TEXTURE | _NEW_TEXTURE_MATRIX |
 497                      _NEW_TRANSFORM | _NEW_POINT |
 498                      _NEW_FOG | _NEW_LIGHT |
 499                      _MESA_NEW_NEED_EYE_COORDS);
 500    }
 501    if (new_state & prog_flags)
 502       update_program( ctx );
 503
 504
 505
 506    /*
 507     * Give the driver a chance to act upon the new_state flags.
 508     * The driver might plug in different span functions, for example.
 509     * Also, this is where the driver can invalidate the state of any
 510     * active modules (such as swrast_setup, swrast, tnl, etc).
 511     *
 512     * Set ctx->NewState to zero to avoid recursion if
 513     * Driver.UpdateState() has to call FLUSH_VERTICES().  (fixed?)
 514     */
 515    new_state = ctx->NewState;
 516    ctx->NewState = 0;
 517    ctx->Driver.UpdateState(ctx, new_state);
 518    ctx->Array.NewState = 0;
 519 }
 520
 521
 522 /* This is the usual entrypoint for state updates:
 523  */
 524 void
 525 _mesa_update_state( GLcontext *ctx )
 526 {
 527    _mesa_lock_context_textures(ctx);
 528    _mesa_update_state_locked(ctx);
 529    _mesa_unlock_context_textures(ctx);
 530 }