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 #include "pixel.h"
  44 #include "shader/program.h"
  45 #include "state.h"
  46 #include "stencil.h"
  47 #include "texenvprogram.h"
  48 #include "texobj.h"
  49 #include "texstate.h"
  50
  51
  52 /**
  53  * Update state dependent on vertex arrays.
  54  */
  55 static void
  56 update_arrays( GLcontext *ctx )
  57 {
  58    GLuint i, min;
  59
  60    /* find min of _MaxElement values for all enabled arrays */
  61
  62    /* 0 */
  63    if (ctx->VertexProgram._Current
  64        && ctx->Array.ArrayObj->VertexAttrib[VERT_ATTRIB_POS].Enabled) {
  65       min = ctx->Array.ArrayObj->VertexAttrib[VERT_ATTRIB_POS]._MaxElement;
  66    }
  67    else if (ctx->Array.ArrayObj->Vertex.Enabled) {
  68       min = ctx->Array.ArrayObj->Vertex._MaxElement;
  69    }
  70    else {
  71       /* can't draw anything without vertex positions! */
  72       min = 0;
  73    }
  74
  75    /* 1 */
  76    if (ctx->VertexProgram._Enabled
  77        && ctx->Array.ArrayObj->VertexAttrib[VERT_ATTRIB_WEIGHT].Enabled) {
  78       min = MIN2(min, ctx->Array.ArrayObj->VertexAttrib[VERT_ATTRIB_WEIGHT]._MaxElement);
  79    }
  80    /* no conventional vertex weight array */
  81
  82    /* 2 */
  83    if (ctx->VertexProgram._Enabled
  84        && ctx->Array.ArrayObj->VertexAttrib[VERT_ATTRIB_NORMAL].Enabled) {
  85       min = MIN2(min, ctx->Array.ArrayObj->VertexAttrib[VERT_ATTRIB_NORMAL]._MaxElement);
  86    }
  87    else if (ctx->Array.ArrayObj->Normal.Enabled) {
  88       min = MIN2(min, ctx->Array.ArrayObj->Normal._MaxElement);
  89    }
  90
  91    /* 3 */
  92    if (ctx->VertexProgram._Enabled
  93        && ctx->Array.ArrayObj->VertexAttrib[VERT_ATTRIB_COLOR0].Enabled) {
  94       min = MIN2(min, ctx->Array.ArrayObj->VertexAttrib[VERT_ATTRIB_COLOR0]._MaxElement);
  95    }
  96    else if (ctx->Array.ArrayObj->Color.Enabled) {
  97       min = MIN2(min, ctx->Array.ArrayObj->Color._MaxElement);
  98    }
  99
 100    /* 4 */
 101    if (ctx->VertexProgram._Enabled
 102        && ctx->Array.ArrayObj->VertexAttrib[VERT_ATTRIB_COLOR1].Enabled) {
 103       min = MIN2(min, ctx->Array.ArrayObj->VertexAttrib[VERT_ATTRIB_COLOR1]._MaxElement);
 104    }
 105    else if (ctx->Array.ArrayObj->SecondaryColor.Enabled) {
 106       min = MIN2(min, ctx->Array.ArrayObj->SecondaryColor._MaxElement);
 107    }
 108
 109    /* 5 */
 110    if (ctx->VertexProgram._Enabled
 111        && ctx->Array.ArrayObj->VertexAttrib[VERT_ATTRIB_FOG].Enabled) {
 112       min = MIN2(min, ctx->Array.ArrayObj->VertexAttrib[VERT_ATTRIB_FOG]._MaxElement);
 113    }
 114    else if (ctx->Array.ArrayObj->FogCoord.Enabled) {
 115       min = MIN2(min, ctx->Array.ArrayObj->FogCoord._MaxElement);
 116    }
 117
 118    /* 6 */
 119    if (ctx->VertexProgram._Enabled
 120        && ctx->Array.ArrayObj->VertexAttrib[VERT_ATTRIB_COLOR_INDEX].Enabled) {
 121       min = MIN2(min, ctx->Array.ArrayObj->VertexAttrib[VERT_ATTRIB_COLOR_INDEX]._MaxElement);
 122    }
 123    else if (ctx->Array.ArrayObj->Index.Enabled) {
 124       min = MIN2(min, ctx->Array.ArrayObj->Index._MaxElement);
 125    }
 126
 127
 128    /* 7 */
 129    if (ctx->VertexProgram._Enabled
 130        && ctx->Array.ArrayObj->VertexAttrib[VERT_ATTRIB_EDGEFLAG].Enabled) {
 131       min = MIN2(min, ctx->Array.ArrayObj->VertexAttrib[VERT_ATTRIB_EDGEFLAG]._MaxElement);
 132    }
 133
 134    /* 8..15 */
 135    for (i = VERT_ATTRIB_TEX0; i <= VERT_ATTRIB_TEX7; i++) {
 136       if (ctx->VertexProgram._Enabled
 137           && ctx->Array.ArrayObj->VertexAttrib[i].Enabled) {
 138          min = MIN2(min, ctx->Array.ArrayObj->VertexAttrib[i]._MaxElement);
 139       }
 140       else if (i - VERT_ATTRIB_TEX0 < ctx->Const.MaxTextureCoordUnits
 141                && ctx->Array.ArrayObj->TexCoord[i - VERT_ATTRIB_TEX0].Enabled) {
 142          min = MIN2(min, ctx->Array.ArrayObj->TexCoord[i - VERT_ATTRIB_TEX0]._MaxElement);
 143       }
 144    }
 145
 146    /* 16..31 */
 147    if (ctx->VertexProgram._Current) {
 148       for (i = VERT_ATTRIB_GENERIC0; i < VERT_ATTRIB_MAX; i++) {
 149          if (ctx->Array.ArrayObj->VertexAttrib[i].Enabled) {
 150             min = MIN2(min, ctx->Array.ArrayObj->VertexAttrib[i]._MaxElement);
 151          }
 152       }
 153    }
 154
 155    if (ctx->Array.ArrayObj->EdgeFlag.Enabled) {
 156       min = MIN2(min, ctx->Array.ArrayObj->EdgeFlag._MaxElement);
 157    }
 158
 159    /* _MaxElement is one past the last legal array element */
 160    ctx->Array._MaxElement = min;
 161 }
 162
 163
 164 static void
 165 update_program(GLcontext *ctx)
 166 {
 167    const struct gl_shader_program *shProg = ctx->Shader.CurrentProgram;
 168    const struct gl_vertex_program *prevVP = ctx->VertexProgram._Current;
 169    const struct gl_fragment_program *prevFP = ctx->FragmentProgram._Current;
 170
 171    /* These _Enabled flags indicate if the program is enabled AND valid. */
 172    ctx->VertexProgram._Enabled = ctx->VertexProgram.Enabled
 173       && ctx->VertexProgram.Current->Base.Instructions;
 174    ctx->FragmentProgram._Enabled = ctx->FragmentProgram.Enabled
 175       && ctx->FragmentProgram.Current->Base.Instructions;
 176    ctx->ATIFragmentShader._Enabled = ctx->ATIFragmentShader.Enabled
 177       && ctx->ATIFragmentShader.Current->Instructions;
 178
 179    /*
 180     * Set the ctx->VertexProgram._Current and ctx->FragmentProgram._Current
 181     * pointers to the programs that should be enabled/used.  These will only
 182     * be NULL if we need to use the fixed-function code.
 183     *
 184     * These programs may come from several sources.  The priority is as
 185     * follows:
 186     *   1. OpenGL 2.0/ARB vertex/fragment shaders
 187     *   2. ARB/NV vertex/fragment programs
 188     *   3. Programs derived from fixed-function state.
 189     *
 190     * Note: it's possible for a vertex shader to get used with a fragment
 191     * program (and vice versa) here, but in practice that shouldn't ever
 192     * come up, or matter.
 193     */
 194
 195    /**
 196     ** Fragment program
 197     **/
 198 #if 1
 199    /* XXX get rid of this someday? */
 200    ctx->FragmentProgram._Active = GL_FALSE;
 201 #endif
 202    if (shProg && shProg->LinkStatus && shProg->FragmentProgram) {
 203       /* user-defined fragment shader */
 204       _mesa_reference_fragprog(ctx, &ctx->FragmentProgram._Current,
 205                                shProg->FragmentProgram);
 206    }
 207    else if (ctx->FragmentProgram._Enabled) {
 208       /* use user-defined fragment program */
 209       _mesa_reference_fragprog(ctx, &ctx->FragmentProgram._Current,
 210                                ctx->FragmentProgram.Current);
 211    }
 212    else if (ctx->FragmentProgram._MaintainTexEnvProgram) {
 213       /* fragment program generated from fixed-function state */
 214       _mesa_reference_fragprog(ctx, &ctx->FragmentProgram._Current,
 215                                _mesa_get_fixed_func_fragment_program(ctx));
 216       _mesa_reference_fragprog(ctx, &ctx->FragmentProgram._TexEnvProgram,
 217                                ctx->FragmentProgram._Current);
 218
 219       /* XXX get rid of this confusing stuff someday? */
 220       ctx->FragmentProgram._Active = ctx->FragmentProgram._Enabled;
 221       if (ctx->FragmentProgram._UseTexEnvProgram)
 222          ctx->FragmentProgram._Active = GL_TRUE;
 223    }
 224    else {
 225       /* no fragment program */
 226       _mesa_reference_fragprog(ctx, &ctx->FragmentProgram._Current, NULL);
 227    }
 228
 229    if (ctx->FragmentProgram._Current != prevFP && ctx->Driver.BindProgram) {
 230       ctx->Driver.BindProgram(ctx, GL_FRAGMENT_PROGRAM_ARB,
 231                          (struct gl_program *) ctx->FragmentProgram._Current);
 232    }
 233
 234    /**
 235     ** Vertex program
 236     **/
 237 #if 1
 238    /* XXX get rid of this someday? */
 239    _mesa_reference_vertprog(ctx, &ctx->VertexProgram._TnlProgram, NULL);
 240 #endif
 241    if (shProg && shProg->LinkStatus && shProg->VertexProgram) {
 242       /* user-defined vertex shader */
 243       _mesa_reference_vertprog(ctx, &ctx->VertexProgram._Current,
 244                                shProg->VertexProgram);
 245    }
 246    else if (ctx->VertexProgram._Enabled) {
 247       /* use user-defined vertex program */
 248       _mesa_reference_vertprog(ctx, &ctx->VertexProgram._Current,
 249                                ctx->VertexProgram.Current);
 250    }
 251    else if (ctx->VertexProgram._MaintainTnlProgram) {
 252       /* vertex program generated from fixed-function state */
 253       _mesa_reference_vertprog(ctx, &ctx->VertexProgram._Current,
 254                                _mesa_get_fixed_func_vertex_program(ctx));
 255       _mesa_reference_vertprog(ctx, &ctx->VertexProgram._TnlProgram,
 256                                ctx->VertexProgram._Current);
 257    }
 258    else {
 259       /* no vertex program / used fixed-function code */
 260       _mesa_reference_vertprog(ctx, &ctx->VertexProgram._Current, NULL);
 261    }
 262
 263    if (ctx->VertexProgram._Current != prevVP && ctx->Driver.BindProgram) {
 264       ctx->Driver.BindProgram(ctx, GL_VERTEX_PROGRAM_ARB,
 265                            (struct gl_program *) ctx->VertexProgram._Current);
 266    }
 267 }
 268
 269
 270 static void
 271 update_viewport_matrix(GLcontext *ctx)
 272 {
 273    const GLfloat depthMax = ctx->DrawBuffer->_DepthMaxF;
 274
 275    ASSERT(depthMax > 0);
 276
 277    /* Compute scale and bias values. This is really driver-specific
 278     * and should be maintained elsewhere if at all.
 279     * NOTE: RasterPos uses this.
 280     */
 281    _math_matrix_viewport(&ctx->Viewport._WindowMap,
 282                          ctx->Viewport.X, ctx->Viewport.Y,
 283                          ctx->Viewport.Width, ctx->Viewport.Height,
 284                          ctx->Viewport.Near, ctx->Viewport.Far,
 285                          depthMax);
 286 }
 287
 288
 289 /**
 290  * Update derived color/blend/logicop state.
 291  */
 292 static void
 293 update_color(GLcontext *ctx)
 294 {
 295    /* This is needed to support 1.1's RGB logic ops AND
 296     * 1.0's blending logicops.
 297     */
 298    ctx->Color._LogicOpEnabled = RGBA_LOGICOP_ENABLED(ctx);
 299 }
 300
 301
 302
 303 /**
 304  * Update the ctx->_TriangleCaps bitfield.
 305  * XXX that bitfield should really go away someday!
 306  * This function must be called after other update_*() functions since
 307  * there are dependencies on some other derived values.
 308  */
 309 static void
 310 update_tricaps(GLcontext *ctx, GLbitfield new_state)
 311 {
 312    ctx->_TriangleCaps = 0;
 313
 314    /*
 315     * Points
 316     */
 317    if (1/*new_state & _NEW_POINT*/) {
 318       if (ctx->Point.SmoothFlag)
 319          ctx->_TriangleCaps |= DD_POINT_SMOOTH;
 320       if (ctx->Point.Size != 1.0F)
 321          ctx->_TriangleCaps |= DD_POINT_SIZE;
 322       if (ctx->Point._Attenuated)
 323          ctx->_TriangleCaps |= DD_POINT_ATTEN;
 324    }
 325
 326    /*
 327     * Lines
 328     */
 329    if (1/*new_state & _NEW_LINE*/) {
 330       if (ctx->Line.SmoothFlag)
 331          ctx->_TriangleCaps |= DD_LINE_SMOOTH;
 332       if (ctx->Line.StippleFlag)
 333          ctx->_TriangleCaps |= DD_LINE_STIPPLE;
 334       if (ctx->Line.Width != 1.0)
 335          ctx->_TriangleCaps |= DD_LINE_WIDTH;
 336    }
 337
 338    /*
 339     * Polygons
 340     */
 341    if (1/*new_state & _NEW_POLYGON*/) {
 342       if (ctx->Polygon.SmoothFlag)
 343          ctx->_TriangleCaps |= DD_TRI_SMOOTH;
 344       if (ctx->Polygon.StippleFlag)
 345          ctx->_TriangleCaps |= DD_TRI_STIPPLE;
 346       if (ctx->Polygon.FrontMode != GL_FILL
 347           || ctx->Polygon.BackMode != GL_FILL)
 348          ctx->_TriangleCaps |= DD_TRI_UNFILLED;
 349       if (ctx->Polygon.CullFlag
 350           && ctx->Polygon.CullFaceMode == GL_FRONT_AND_BACK)
 351          ctx->_TriangleCaps |= DD_TRI_CULL_FRONT_BACK;
 352       if (ctx->Polygon.OffsetPoint ||
 353           ctx->Polygon.OffsetLine ||
 354           ctx->Polygon.OffsetFill)
 355          ctx->_TriangleCaps |= DD_TRI_OFFSET;
 356    }
 357
 358    /*
 359     * Lighting and shading
 360     */
 361    if (ctx->Light.Enabled && ctx->Light.Model.TwoSide)
 362       ctx->_TriangleCaps |= DD_TRI_LIGHT_TWOSIDE;
 363    if (ctx->Light.ShadeModel == GL_FLAT)
 364       ctx->_TriangleCaps |= DD_FLATSHADE;
 365    if (NEED_SECONDARY_COLOR(ctx))
 366       ctx->_TriangleCaps |= DD_SEPARATE_SPECULAR;
 367
 368    /*
 369     * Stencil
 370     */
 371    if (ctx->Stencil._TestTwoSide)
 372       ctx->_TriangleCaps |= DD_TRI_TWOSTENCIL;
 373 }
 374
 375
 376 /**
 377  * Compute derived GL state.
 378  * If __GLcontextRec::NewState is non-zero then this function \b must
 379  * be called before rendering anything.
 380  *
 381  * Calls dd_function_table::UpdateState to perform any internal state
 382  * management necessary.
 383  *
 384  * \sa _mesa_update_modelview_project(), _mesa_update_texture(),
 385  * _mesa_update_buffer_bounds(),
 386  * _mesa_update_lighting() and _mesa_update_tnl_spaces().
 387  */
 388 void
 389 _mesa_update_state_locked( GLcontext *ctx )
 390 {
 391    GLbitfield new_state = ctx->NewState;
 392    GLbitfield prog_flags = _NEW_PROGRAM;
 393
 394    if (MESA_VERBOSE & VERBOSE_STATE)
 395       _mesa_print_state("_mesa_update_state", new_state);
 396
 397    if (new_state & (_NEW_MODELVIEW|_NEW_PROJECTION))
 398       _mesa_update_modelview_project( ctx, new_state );
 399
 400    if (new_state & (_NEW_PROGRAM|_NEW_TEXTURE|_NEW_TEXTURE_MATRIX))
 401       _mesa_update_texture( ctx, new_state );
 402
 403    if (new_state & _NEW_BUFFERS)
 404       _mesa_update_framebuffer(ctx);
 405
 406    if (new_state & (_NEW_SCISSOR | _NEW_BUFFERS | _NEW_VIEWPORT))
 407       _mesa_update_draw_buffer_bounds( ctx );
 408
 409    if (new_state & _NEW_LIGHT)
 410       _mesa_update_lighting( ctx );
 411
 412    if (new_state & _NEW_STENCIL)
 413       _mesa_update_stencil( ctx );
 414
 415    if (new_state & _IMAGE_NEW_TRANSFER_STATE)
 416       _mesa_update_pixel( ctx, new_state );
 417
 418    if (new_state & (_NEW_ARRAY | _NEW_PROGRAM))
 419       update_arrays( ctx );
 420
 421    if (new_state & (_NEW_BUFFERS | _NEW_VIEWPORT))
 422       update_viewport_matrix(ctx);
 423
 424    if (new_state & _NEW_COLOR)
 425       update_color( ctx );
 426
 427    if (new_state & (_NEW_POINT | _NEW_LINE | _NEW_POLYGON | _NEW_LIGHT
 428                     | _NEW_STENCIL | _DD_NEW_SEPARATE_SPECULAR))
 429       update_tricaps( ctx, new_state );
 430
 431    /* ctx->_NeedEyeCoords is now up to date.
 432     *
 433     * If the truth value of this variable has changed, update for the
 434     * new lighting space and recompute the positions of lights and the
 435     * normal transform.
 436     *
 437     * If the lighting space hasn't changed, may still need to recompute
 438     * light positions & normal transforms for other reasons.
 439     */
 440    if (new_state & _MESA_NEW_NEED_EYE_COORDS)
 441       _mesa_update_tnl_spaces( ctx, new_state );
 442
 443    if (ctx->FragmentProgram._MaintainTexEnvProgram) {
 444       prog_flags |= (_NEW_TEXTURE | _NEW_FOG | _DD_NEW_SEPARATE_SPECULAR);
 445    }
 446    if (ctx->VertexProgram._MaintainTnlProgram) {
 447       prog_flags |= (_NEW_TEXTURE | _NEW_TEXTURE_MATRIX |
 448                      _NEW_TRANSFORM | _NEW_POINT |
 449                      _NEW_FOG | _NEW_LIGHT |
 450                      _MESA_NEW_NEED_EYE_COORDS);
 451    }
 452    if (new_state & prog_flags)
 453       update_program( ctx );
 454
 455
 456
 457    /*
 458     * Give the driver a chance to act upon the new_state flags.
 459     * The driver might plug in different span functions, for example.
 460     * Also, this is where the driver can invalidate the state of any
 461     * active modules (such as swrast_setup, swrast, tnl, etc).
 462     *
 463     * Set ctx->NewState to zero to avoid recursion if
 464     * Driver.UpdateState() has to call FLUSH_VERTICES().  (fixed?)
 465     */
 466    new_state = ctx->NewState;
 467    ctx->NewState = 0;
 468    ctx->Driver.UpdateState(ctx, new_state);
 469    ctx->Array.NewState = 0;
 470 }
 471
 472
 473 /* This is the usual entrypoint for state updates:
 474  */
 475 void
 476 _mesa_update_state( GLcontext *ctx )
 477 {
 478    _mesa_lock_context_textures(ctx);
 479    _mesa_update_state_locked(ctx);
 480    _mesa_unlock_context_textures(ctx);
 481 }