src/mesa/main/state.c

   1 /*
   2  * Mesa 3-D graphics library
   3  *
   4  * Copyright (C) 1999-2008  Brian Paul   All Rights Reserved.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * copy of this software and associated documentation files (the "Software"),
   8  * to deal in the Software without restriction, including without limitation
   9  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  10  * and/or sell copies of the Software, and to permit persons to whom the
  11  * Software is furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included
  14  * in all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  17  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
  20  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  21  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  22  * 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 struct gl_context.
  31  */
  32
  33
  34 #include "glheader.h"
  35 #include "mtypes.h"
  36 #include "arrayobj.h"
  37 #include "context.h"
  38 #include "debug.h"
  39 #include "macros.h"
  40 #include "ffvertex_prog.h"
  41 #include "framebuffer.h"
  42 #include "light.h"
  43 #include "matrix.h"
  44 #include "pixel.h"
  45 #include "program/program.h"
  46 #include "program/prog_parameter.h"
  47 #include "shaderobj.h"
  48 #include "state.h"
  49 #include "stencil.h"
  50 #include "texenvprogram.h"
  51 #include "texobj.h"
  52 #include "texstate.h"
  53 #include "varray.h"
  54 #include "vbo/vbo.h"
  55 #include "viewport.h"
  56 #include "blend.h"
  57
  58
  59 /**
  60  * Update the ctx->*Program._Current pointers to point to the
  61  * current/active programs.
  62  *
  63  * Programs may come from 3 sources: GLSL shaders, ARB/NV_vertex/fragment
  64  * programs or programs derived from fixed-function state.
  65  *
  66  * This function needs to be called after texture state validation in case
  67  * we're generating a fragment program from fixed-function texture state.
  68  *
  69  * \return bitfield which will indicate _NEW_PROGRAM state if a new vertex
  70  * or fragment program is being used.
  71  */
  72 static GLbitfield
  73 update_program(struct gl_context *ctx)
  74 {
  75    struct gl_program *vsProg =
  76       ctx->_Shader->CurrentProgram[MESA_SHADER_VERTEX];
  77    struct gl_program *tcsProg =
  78       ctx->_Shader->CurrentProgram[MESA_SHADER_TESS_CTRL];
  79    struct gl_program *tesProg =
  80       ctx->_Shader->CurrentProgram[MESA_SHADER_TESS_EVAL];
  81    struct gl_program *gsProg =
  82       ctx->_Shader->CurrentProgram[MESA_SHADER_GEOMETRY];
  83    struct gl_program *fsProg =
  84       ctx->_Shader->CurrentProgram[MESA_SHADER_FRAGMENT];
  85    struct gl_program *csProg =
  86       ctx->_Shader->CurrentProgram[MESA_SHADER_COMPUTE];
  87    const struct gl_program *prevVP = ctx->VertexProgram._Current;
  88    const struct gl_program *prevFP = ctx->FragmentProgram._Current;
  89    const struct gl_program *prevGP = ctx->GeometryProgram._Current;
  90    const struct gl_program *prevTCP = ctx->TessCtrlProgram._Current;
  91    const struct gl_program *prevTEP = ctx->TessEvalProgram._Current;
  92    const struct gl_program *prevCP = ctx->ComputeProgram._Current;
  93
  94    /*
  95     * Set the ctx->VertexProgram._Current and ctx->FragmentProgram._Current
  96     * pointers to the programs that should be used for rendering.  If either
  97     * is NULL, use fixed-function code paths.
  98     *
  99     * These programs may come from several sources.  The priority is as
 100     * follows:
 101     *   1. OpenGL 2.0/ARB vertex/fragment shaders
 102     *   2. ARB/NV vertex/fragment programs
 103     *   3. ATI fragment shader
 104     *   4. Programs derived from fixed-function state.
 105     *
 106     * Note: it's possible for a vertex shader to get used with a fragment
 107     * program (and vice versa) here, but in practice that shouldn't ever
 108     * come up, or matter.
 109     */
 110
 111    if (fsProg) {
 112       /* Use GLSL fragment shader */
 113       _mesa_reference_program(ctx, &ctx->FragmentProgram._Current, fsProg);
 114       _mesa_reference_program(ctx, &ctx->FragmentProgram._TexEnvProgram,
 115                               NULL);
 116    }
 117    else if (_mesa_arb_fragment_program_enabled(ctx)) {
 118       /* Use user-defined fragment program */
 119       _mesa_reference_program(ctx, &ctx->FragmentProgram._Current,
 120                               ctx->FragmentProgram.Current);
 121       _mesa_reference_program(ctx, &ctx->FragmentProgram._TexEnvProgram,
 122                               NULL);
 123    }
 124    else if (_mesa_ati_fragment_shader_enabled(ctx) &&
 125             ctx->ATIFragmentShader.Current->Program) {
 126        /* Use the enabled ATI fragment shader's associated program */
 127       _mesa_reference_program(ctx, &ctx->FragmentProgram._Current,
 128                               ctx->ATIFragmentShader.Current->Program);
 129       _mesa_reference_program(ctx, &ctx->FragmentProgram._TexEnvProgram,
 130                               NULL);
 131    }
 132    else if (ctx->FragmentProgram._MaintainTexEnvProgram) {
 133       /* Use fragment program generated from fixed-function state */
 134       struct gl_shader_program *f = _mesa_get_fixed_func_fragment_program(ctx);
 135
 136       _mesa_reference_program(ctx, &ctx->FragmentProgram._Current,
 137                               f->_LinkedShaders[MESA_SHADER_FRAGMENT]->Program);
 138       _mesa_reference_program(ctx, &ctx->FragmentProgram._TexEnvProgram,
 139                               f->_LinkedShaders[MESA_SHADER_FRAGMENT]->Program);
 140    }
 141    else {
 142       /* No fragment program */
 143       _mesa_reference_program(ctx, &ctx->FragmentProgram._Current, NULL);
 144       _mesa_reference_program(ctx, &ctx->FragmentProgram._TexEnvProgram,
 145                               NULL);
 146    }
 147
 148    if (gsProg) {
 149       /* Use GLSL geometry shader */
 150       _mesa_reference_program(ctx, &ctx->GeometryProgram._Current, gsProg);
 151    } else {
 152       /* No geometry program */
 153       _mesa_reference_program(ctx, &ctx->GeometryProgram._Current, NULL);
 154    }
 155
 156    if (tesProg) {
 157       /* Use GLSL tessellation evaluation shader */
 158       _mesa_reference_program(ctx, &ctx->TessEvalProgram._Current, tesProg);
 159    }
 160    else {
 161       /* No tessellation evaluation program */
 162       _mesa_reference_program(ctx, &ctx->TessEvalProgram._Current, NULL);
 163    }
 164
 165    if (tcsProg) {
 166       /* Use GLSL tessellation control shader */
 167       _mesa_reference_program(ctx, &ctx->TessCtrlProgram._Current, tcsProg);
 168    }
 169    else {
 170       /* No tessellation control program */
 171       _mesa_reference_program(ctx, &ctx->TessCtrlProgram._Current, NULL);
 172    }
 173
 174    /* Examine vertex program after fragment program as
 175     * _mesa_get_fixed_func_vertex_program() needs to know active
 176     * fragprog inputs.
 177     */
 178    if (vsProg) {
 179       /* Use GLSL vertex shader */
 180       assert(VP_MODE_SHADER == ctx->VertexProgram._VPMode);
 181       _mesa_reference_program(ctx, &ctx->VertexProgram._Current, vsProg);
 182    }
 183    else if (_mesa_arb_vertex_program_enabled(ctx)) {
 184       /* Use user-defined vertex program */
 185       assert(VP_MODE_SHADER == ctx->VertexProgram._VPMode);
 186       _mesa_reference_program(ctx, &ctx->VertexProgram._Current,
 187                               ctx->VertexProgram.Current);
 188    }
 189    else if (ctx->VertexProgram._MaintainTnlProgram) {
 190       /* Use vertex program generated from fixed-function state */
 191       assert(VP_MODE_FF == ctx->VertexProgram._VPMode);
 192       _mesa_reference_program(ctx, &ctx->VertexProgram._Current,
 193                               _mesa_get_fixed_func_vertex_program(ctx));
 194       _mesa_reference_program(ctx, &ctx->VertexProgram._TnlProgram,
 195                               ctx->VertexProgram._Current);
 196    }
 197    else {
 198       /* no vertex program */
 199       assert(VP_MODE_FF == ctx->VertexProgram._VPMode);
 200       _mesa_reference_program(ctx, &ctx->VertexProgram._Current, NULL);
 201    }
 202
 203    if (csProg) {
 204       /* Use GLSL compute shader */
 205       _mesa_reference_program(ctx, &ctx->ComputeProgram._Current, csProg);
 206    } else {
 207       /* no compute program */
 208       _mesa_reference_program(ctx, &ctx->ComputeProgram._Current, NULL);
 209    }
 210
 211    /* Let the driver know what's happening:
 212     */
 213    if (ctx->FragmentProgram._Current != prevFP ||
 214        ctx->VertexProgram._Current != prevVP ||
 215        ctx->GeometryProgram._Current != prevGP ||
 216        ctx->TessEvalProgram._Current != prevTEP ||
 217        ctx->TessCtrlProgram._Current != prevTCP ||
 218        ctx->ComputeProgram._Current != prevCP)
 219       return _NEW_PROGRAM;
 220
 221    return 0;
 222 }
 223
 224
 225 /**
 226  * Examine shader constants and return either _NEW_PROGRAM_CONSTANTS or 0.
 227  */
 228 static GLbitfield
 229 update_program_constants(struct gl_context *ctx)
 230 {
 231    GLbitfield new_state = 0x0;
 232
 233    if (ctx->FragmentProgram._Current) {
 234       const struct gl_program_parameter_list *params =
 235          ctx->FragmentProgram._Current->Parameters;
 236       if (params && params->StateFlags & ctx->NewState) {
 237          if (ctx->DriverFlags.NewShaderConstants[MESA_SHADER_FRAGMENT]) {
 238             ctx->NewDriverState |=
 239                ctx->DriverFlags.NewShaderConstants[MESA_SHADER_FRAGMENT];
 240          } else {
 241             new_state |= _NEW_PROGRAM_CONSTANTS;
 242          }
 243       }
 244    }
 245
 246    /* Don't handle tessellation and geometry shaders here. They don't use
 247     * any state constants.
 248     */
 249
 250    if (ctx->VertexProgram._Current) {
 251       const struct gl_program_parameter_list *params =
 252          ctx->VertexProgram._Current->Parameters;
 253       if (params && params->StateFlags & ctx->NewState) {
 254          if (ctx->DriverFlags.NewShaderConstants[MESA_SHADER_VERTEX]) {
 255             ctx->NewDriverState |=
 256                ctx->DriverFlags.NewShaderConstants[MESA_SHADER_VERTEX];
 257          } else {
 258             new_state |= _NEW_PROGRAM_CONSTANTS;
 259          }
 260       }
 261    }
 262
 263    return new_state;
 264 }
 265
 266
 267 /**
 268  * Compute derived GL state.
 269  * If __struct gl_contextRec::NewState is non-zero then this function \b must
 270  * be called before rendering anything.
 271  *
 272  * Calls dd_function_table::UpdateState to perform any internal state
 273  * management necessary.
 274  *
 275  * \sa _mesa_update_modelview_project(), _mesa_update_texture(),
 276  * _mesa_update_buffer_bounds(),
 277  * _mesa_update_lighting() and _mesa_update_tnl_spaces().
 278  */
 279 void
 280 _mesa_update_state_locked( struct gl_context *ctx )
 281 {
 282    GLbitfield new_state = ctx->NewState;
 283    GLbitfield new_prog_state = 0x0;
 284    const GLbitfield computed_states = ~(_NEW_CURRENT_ATTRIB | _NEW_LINE);
 285
 286    /* we can skip a bunch of state validation checks if the dirty
 287     * state matches one or more bits in 'computed_states'.
 288     */
 289    if ((new_state & computed_states) == 0)
 290       goto out;
 291
 292    if (MESA_VERBOSE & VERBOSE_STATE)
 293       _mesa_print_state("_mesa_update_state", new_state);
 294
 295    if (new_state & _NEW_BUFFERS)
 296       _mesa_update_framebuffer(ctx, ctx->ReadBuffer, ctx->DrawBuffer);
 297
 298    /* Handle Core and Compatibility contexts separately. */
 299    if (ctx->API == API_OPENGL_COMPAT ||
 300        ctx->API == API_OPENGLES) {
 301       GLbitfield prog_flags = _NEW_PROGRAM;
 302
 303       /* Determine which state flags effect vertex/fragment program state */
 304       if (ctx->FragmentProgram._MaintainTexEnvProgram) {
 305          prog_flags |= (_NEW_BUFFERS | _NEW_TEXTURE_OBJECT | _NEW_FOG |
 306                         _NEW_VARYING_VP_INPUTS | _NEW_LIGHT | _NEW_POINT |
 307                         _NEW_RENDERMODE | _NEW_PROGRAM | _NEW_FRAG_CLAMP |
 308                         _NEW_COLOR | _NEW_TEXTURE_STATE);
 309       }
 310       if (ctx->VertexProgram._MaintainTnlProgram) {
 311          prog_flags |= (_NEW_VARYING_VP_INPUTS | _NEW_TEXTURE_OBJECT |
 312                         _NEW_TEXTURE_MATRIX | _NEW_TRANSFORM | _NEW_POINT |
 313                         _NEW_FOG | _NEW_LIGHT | _NEW_TEXTURE_STATE |
 314                         _MESA_NEW_NEED_EYE_COORDS);
 315       }
 316
 317       /*
 318        * Now update derived state info
 319        */
 320       if (new_state & (_NEW_MODELVIEW|_NEW_PROJECTION))
 321          _mesa_update_modelview_project( ctx, new_state );
 322
 323       if (new_state & _NEW_TEXTURE_MATRIX)
 324          _mesa_update_texture_matrices(ctx);
 325
 326       if (new_state & (_NEW_TEXTURE_OBJECT | _NEW_TEXTURE_STATE | _NEW_PROGRAM))
 327          _mesa_update_texture_state(ctx);
 328
 329       if (new_state & _NEW_LIGHT)
 330          _mesa_update_lighting(ctx);
 331
 332       if (new_state & _NEW_PIXEL)
 333          _mesa_update_pixel( ctx );
 334
 335       /* ctx->_NeedEyeCoords is now up to date.
 336        *
 337        * If the truth value of this variable has changed, update for the
 338        * new lighting space and recompute the positions of lights and the
 339        * normal transform.
 340        *
 341        * If the lighting space hasn't changed, may still need to recompute
 342        * light positions & normal transforms for other reasons.
 343        */
 344       if (new_state & _MESA_NEW_NEED_EYE_COORDS)
 345          _mesa_update_tnl_spaces( ctx, new_state );
 346
 347       if (new_state & prog_flags) {
 348          /* When we generate programs from fixed-function vertex/fragment state
 349           * this call may generate/bind a new program.  If so, we need to
 350           * propogate the _NEW_PROGRAM flag to the driver.
 351           */
 352          new_prog_state |= update_program(ctx);
 353       }
 354    } else {
 355       /* GL Core and GLES 2/3 contexts */
 356       if (new_state & (_NEW_TEXTURE_OBJECT | _NEW_PROGRAM))
 357          _mesa_update_texture_state(ctx);
 358
 359       if (new_state & _NEW_PROGRAM)
 360          update_program(ctx);
 361    }
 362
 363    if (new_state & _NEW_ARRAY)
 364       _mesa_update_vao_derived_arrays(ctx, ctx->Array.VAO);
 365
 366  out:
 367    new_prog_state |= update_program_constants(ctx);
 368
 369    ctx->NewState |= new_prog_state;
 370    vbo_exec_invalidate_state(ctx);
 371
 372    /*
 373     * Give the driver a chance to act upon the new_state flags.
 374     * The driver might plug in different span functions, for example.
 375     * Also, this is where the driver can invalidate the state of any
 376     * active modules (such as swrast_setup, swrast, tnl, etc).
 377     */
 378    ctx->Driver.UpdateState(ctx);
 379    ctx->NewState = 0;
 380    ctx->Array.VAO->NewArrays = 0x0;
 381 }
 382
 383
 384 /* This is the usual entrypoint for state updates:
 385  */
 386 void
 387 _mesa_update_state( struct gl_context *ctx )
 388 {
 389    _mesa_lock_context_textures(ctx);
 390    _mesa_update_state_locked(ctx);
 391    _mesa_unlock_context_textures(ctx);
 392 }
 393
 394
 395
 396
 397 /**
 398  * Want to figure out which fragment program inputs are actually
 399  * constant/current values from ctx->Current.  These should be
 400  * referenced as a tracked state variable rather than a fragment
 401  * program input, to save the overhead of putting a constant value in
 402  * every submitted vertex, transferring it to hardware, interpolating
 403  * it across the triangle, etc...
 404  *
 405  * When there is a VP bound, just use vp->outputs.  But when we're
 406  * generating vp from fixed function state, basically want to
 407  * calculate:
 408  *
 409  * vp_out_2_fp_in( vp_in_2_vp_out( varying_inputs ) |
 410  *                 potential_vp_outputs )
 411  *
 412  * Where potential_vp_outputs is calculated by looking at enabled
 413  * texgen, etc.
 414  *
 415  * The generated fragment program should then only declare inputs that
 416  * may vary or otherwise differ from the ctx->Current values.
 417  * Otherwise, the fp should track them as state values instead.
 418  */
 419 void
 420 _mesa_set_varying_vp_inputs( struct gl_context *ctx,
 421                              GLbitfield varying_inputs )
 422 {
 423    if (ctx->API != API_OPENGL_COMPAT &&
 424        ctx->API != API_OPENGLES)
 425       return;
 426
 427    if (ctx->varying_vp_inputs != varying_inputs) {
 428       ctx->varying_vp_inputs = varying_inputs;
 429
 430       /* Only the fixed-func generated programs need to use the flag
 431        * and the fixed-func fragment program uses it only if there is also
 432        * a fixed-func vertex program, so this only depends on the latter.
 433        *
 434        * It's okay to check the VP pointer here, because this is called after
 435        * _mesa_update_state in the vbo module. */
 436       if (ctx->VertexProgram._TnlProgram ||
 437           ctx->FragmentProgram._TexEnvProgram) {
 438          ctx->NewState |= _NEW_VARYING_VP_INPUTS;
 439       }
 440       /*printf("%s %x\n", __func__, varying_inputs);*/
 441    }
 442 }
 443
 444
 445 /**
 446  * Used by drivers to tell core Mesa that the driver is going to
 447  * install/ use its own vertex program.  In particular, this will
 448  * prevent generated fragment programs from using state vars instead
 449  * of ordinary varyings/inputs.
 450  */
 451 void
 452 _mesa_set_vp_override(struct gl_context *ctx, GLboolean flag)
 453 {
 454    if (ctx->VertexProgram._Overriden != flag) {
 455       ctx->VertexProgram._Overriden = flag;
 456
 457       /* Set one of the bits which will trigger fragment program
 458        * regeneration:
 459        */
 460       ctx->NewState |= _NEW_PROGRAM;
 461    }
 462 }
 463
 464
 465 /**
 466  * Update ctx->VertexProgram._VPMode.
 467  * This is to distinguish whether we're running
 468  *   a vertex program/shader,
 469  *   a fixed-function TNL program or
 470  *   a fixed function vertex transformation without any program.
 471  */
 472 void
 473 _mesa_update_vertex_processing_mode(struct gl_context *ctx)
 474 {
 475    if (ctx->_Shader->CurrentProgram[MESA_SHADER_VERTEX])
 476       ctx->VertexProgram._VPMode = VP_MODE_SHADER;
 477    else if (_mesa_arb_vertex_program_enabled(ctx))
 478       ctx->VertexProgram._VPMode = VP_MODE_SHADER;
 479    else
 480       ctx->VertexProgram._VPMode = VP_MODE_FF;
 481 }
 482
 483
 484 /**
 485  * Set the _DrawVAO and the net enabled arrays.
 486  * The vao->_Enabled bitmask is transformed due to position/generic0
 487  * as stored in vao->_AttributeMapMode. Then the filter bitmask is applied
 488  * to filter out arrays unwanted for the currently executed draw operation.
 489  * For example, the generic attributes are masked out form the _DrawVAO's
 490  * enabled arrays when a fixed function array draw is executed.
 491  */
 492 void
 493 _mesa_set_draw_vao(struct gl_context *ctx, struct gl_vertex_array_object *vao,
 494                    GLbitfield filter)
 495 {
 496    struct gl_vertex_array_object **ptr = &ctx->Array._DrawVAO;
 497    if (*ptr != vao) {
 498       _mesa_reference_vao_(ctx, ptr, vao);
 499       ctx->NewDriverState |= ctx->DriverFlags.NewArray;
 500    } else if (vao->NewArrays) {
 501       ctx->NewDriverState |= ctx->DriverFlags.NewArray;
 502    }
 503
 504    /* May shuffle the position and generic0 bits around, filter out unwanted */
 505    const GLbitfield enabled = filter & _mesa_get_vao_vp_inputs(vao);
 506    if (ctx->Array._DrawVAOEnabledAttribs != enabled)
 507       ctx->NewDriverState |= ctx->DriverFlags.NewArray;
 508    ctx->Array._DrawVAOEnabledAttribs = enabled;
 509    _mesa_set_varying_vp_inputs(ctx, enabled);
 510 }