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_context.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       _mesa_reference_program(ctx, &ctx->VertexProgram._Current, vsProg);
 181    }
 182    else if (_mesa_arb_vertex_program_enabled(ctx)) {
 183       /* Use user-defined vertex program */
 184       _mesa_reference_program(ctx, &ctx->VertexProgram._Current,
 185                               ctx->VertexProgram.Current);
 186    }
 187    else if (ctx->VertexProgram._MaintainTnlProgram) {
 188       /* Use vertex program generated from fixed-function state */
 189       _mesa_reference_program(ctx, &ctx->VertexProgram._Current,
 190                               _mesa_get_fixed_func_vertex_program(ctx));
 191       _mesa_reference_program(ctx, &ctx->VertexProgram._TnlProgram,
 192                               ctx->VertexProgram._Current);
 193    }
 194    else {
 195       /* no vertex program */
 196       _mesa_reference_program(ctx, &ctx->VertexProgram._Current, NULL);
 197    }
 198
 199    if (csProg) {
 200       /* Use GLSL compute shader */
 201       _mesa_reference_program(ctx, &ctx->ComputeProgram._Current, csProg);
 202    } else {
 203       /* no compute program */
 204       _mesa_reference_program(ctx, &ctx->ComputeProgram._Current, NULL);
 205    }
 206
 207    /* Let the driver know what's happening:
 208     */
 209    if (ctx->FragmentProgram._Current != prevFP ||
 210        ctx->VertexProgram._Current != prevVP ||
 211        ctx->GeometryProgram._Current != prevGP ||
 212        ctx->TessEvalProgram._Current != prevTEP ||
 213        ctx->TessCtrlProgram._Current != prevTCP ||
 214        ctx->ComputeProgram._Current != prevCP)
 215       return _NEW_PROGRAM;
 216
 217    return 0;
 218 }
 219
 220
 221 /**
 222  * Examine shader constants and return either _NEW_PROGRAM_CONSTANTS or 0.
 223  */
 224 static GLbitfield
 225 update_program_constants(struct gl_context *ctx)
 226 {
 227    GLbitfield new_state = 0x0;
 228
 229    if (ctx->FragmentProgram._Current) {
 230       const struct gl_program_parameter_list *params =
 231          ctx->FragmentProgram._Current->Parameters;
 232       if (params && params->StateFlags & ctx->NewState) {
 233          if (ctx->DriverFlags.NewShaderConstants[MESA_SHADER_FRAGMENT]) {
 234             ctx->NewDriverState |=
 235                ctx->DriverFlags.NewShaderConstants[MESA_SHADER_FRAGMENT];
 236          } else {
 237             new_state |= _NEW_PROGRAM_CONSTANTS;
 238          }
 239       }
 240    }
 241
 242    /* Don't handle tessellation and geometry shaders here. They don't use
 243     * any state constants.
 244     */
 245
 246    if (ctx->VertexProgram._Current) {
 247       const struct gl_program_parameter_list *params =
 248          ctx->VertexProgram._Current->Parameters;
 249       if (params && params->StateFlags & ctx->NewState) {
 250          if (ctx->DriverFlags.NewShaderConstants[MESA_SHADER_VERTEX]) {
 251             ctx->NewDriverState |=
 252                ctx->DriverFlags.NewShaderConstants[MESA_SHADER_VERTEX];
 253          } else {
 254             new_state |= _NEW_PROGRAM_CONSTANTS;
 255          }
 256       }
 257    }
 258
 259    return new_state;
 260 }
 261
 262
 263 /**
 264  * Compute derived GL state.
 265  * If __struct gl_contextRec::NewState is non-zero then this function \b must
 266  * be called before rendering anything.
 267  *
 268  * Calls dd_function_table::UpdateState to perform any internal state
 269  * management necessary.
 270  *
 271  * \sa _mesa_update_modelview_project(), _mesa_update_texture(),
 272  * _mesa_update_buffer_bounds(),
 273  * _mesa_update_lighting() and _mesa_update_tnl_spaces().
 274  */
 275 void
 276 _mesa_update_state_locked( struct gl_context *ctx )
 277 {
 278    GLbitfield new_state = ctx->NewState;
 279    GLbitfield new_prog_state = 0x0;
 280    const GLbitfield computed_states = ~(_NEW_CURRENT_ATTRIB | _NEW_LINE);
 281
 282    /* we can skip a bunch of state validation checks if the dirty
 283     * state matches one or more bits in 'computed_states'.
 284     */
 285    if ((new_state & computed_states) == 0)
 286       goto out;
 287
 288    if (MESA_VERBOSE & VERBOSE_STATE)
 289       _mesa_print_state("_mesa_update_state", new_state);
 290
 291    if (new_state & _NEW_BUFFERS)
 292       _mesa_update_framebuffer(ctx, ctx->ReadBuffer, ctx->DrawBuffer);
 293
 294    /* Handle Core and Compatibility contexts separately. */
 295    if (ctx->API == API_OPENGL_COMPAT ||
 296        ctx->API == API_OPENGLES) {
 297       GLbitfield prog_flags = _NEW_PROGRAM;
 298
 299       /* Determine which state flags effect vertex/fragment program state */
 300       if (ctx->FragmentProgram._MaintainTexEnvProgram) {
 301          prog_flags |= (_NEW_BUFFERS | _NEW_TEXTURE_OBJECT | _NEW_FOG |
 302                         _NEW_VARYING_VP_INPUTS | _NEW_LIGHT | _NEW_POINT |
 303                         _NEW_RENDERMODE | _NEW_PROGRAM | _NEW_FRAG_CLAMP |
 304                         _NEW_COLOR | _NEW_TEXTURE_STATE);
 305       }
 306       if (ctx->VertexProgram._MaintainTnlProgram) {
 307          prog_flags |= (_NEW_VARYING_VP_INPUTS | _NEW_TEXTURE_OBJECT |
 308                         _NEW_TEXTURE_MATRIX | _NEW_TRANSFORM | _NEW_POINT |
 309                         _NEW_FOG | _NEW_LIGHT | _NEW_TEXTURE_STATE |
 310                         _MESA_NEW_NEED_EYE_COORDS);
 311       }
 312
 313       /*
 314        * Now update derived state info
 315        */
 316       if (new_state & (_NEW_MODELVIEW|_NEW_PROJECTION))
 317          _mesa_update_modelview_project( ctx, new_state );
 318
 319       if (new_state & _NEW_TEXTURE_MATRIX)
 320          _mesa_update_texture_matrices(ctx);
 321
 322       if (new_state & (_NEW_TEXTURE_OBJECT | _NEW_TEXTURE_STATE | _NEW_PROGRAM))
 323          _mesa_update_texture_state(ctx);
 324
 325       if (new_state & _NEW_LIGHT)
 326          _mesa_update_lighting(ctx);
 327
 328       if (new_state & _NEW_PIXEL)
 329          _mesa_update_pixel( ctx );
 330
 331       /* ctx->_NeedEyeCoords is now up to date.
 332        *
 333        * If the truth value of this variable has changed, update for the
 334        * new lighting space and recompute the positions of lights and the
 335        * normal transform.
 336        *
 337        * If the lighting space hasn't changed, may still need to recompute
 338        * light positions & normal transforms for other reasons.
 339        */
 340       if (new_state & _MESA_NEW_NEED_EYE_COORDS)
 341          _mesa_update_tnl_spaces( ctx, new_state );
 342
 343       if (new_state & prog_flags) {
 344          /* When we generate programs from fixed-function vertex/fragment state
 345           * this call may generate/bind a new program.  If so, we need to
 346           * propogate the _NEW_PROGRAM flag to the driver.
 347           */
 348          new_prog_state |= update_program(ctx);
 349       }
 350    } else {
 351       /* GL Core and GLES 2/3 contexts */
 352       if (new_state & (_NEW_TEXTURE_OBJECT | _NEW_PROGRAM))
 353          _mesa_update_texture_state(ctx);
 354
 355       if (new_state & _NEW_PROGRAM)
 356          update_program(ctx);
 357    }
 358
 359    if (new_state & _NEW_ARRAY)
 360       _mesa_update_vao_client_arrays(ctx, ctx->Array.VAO);
 361
 362  out:
 363    new_prog_state |= update_program_constants(ctx);
 364
 365    ctx->NewState |= new_prog_state;
 366    vbo_exec_invalidate_state(ctx);
 367
 368    /*
 369     * Give the driver a chance to act upon the new_state flags.
 370     * The driver might plug in different span functions, for example.
 371     * Also, this is where the driver can invalidate the state of any
 372     * active modules (such as swrast_setup, swrast, tnl, etc).
 373     */
 374    ctx->Driver.UpdateState(ctx);
 375    ctx->NewState = 0;
 376    ctx->Array.VAO->NewArrays = 0x0;
 377 }
 378
 379
 380 /* This is the usual entrypoint for state updates:
 381  */
 382 void
 383 _mesa_update_state( struct gl_context *ctx )
 384 {
 385    _mesa_lock_context_textures(ctx);
 386    _mesa_update_state_locked(ctx);
 387    _mesa_unlock_context_textures(ctx);
 388 }
 389
 390
 391
 392
 393 /**
 394  * Want to figure out which fragment program inputs are actually
 395  * constant/current values from ctx->Current.  These should be
 396  * referenced as a tracked state variable rather than a fragment
 397  * program input, to save the overhead of putting a constant value in
 398  * every submitted vertex, transferring it to hardware, interpolating
 399  * it across the triangle, etc...
 400  *
 401  * When there is a VP bound, just use vp->outputs.  But when we're
 402  * generating vp from fixed function state, basically want to
 403  * calculate:
 404  *
 405  * vp_out_2_fp_in( vp_in_2_vp_out( varying_inputs ) |
 406  *                 potential_vp_outputs )
 407  *
 408  * Where potential_vp_outputs is calculated by looking at enabled
 409  * texgen, etc.
 410  *
 411  * The generated fragment program should then only declare inputs that
 412  * may vary or otherwise differ from the ctx->Current values.
 413  * Otherwise, the fp should track them as state values instead.
 414  */
 415 void
 416 _mesa_set_varying_vp_inputs( struct gl_context *ctx,
 417                              GLbitfield64 varying_inputs )
 418 {
 419    if (ctx->API != API_OPENGL_COMPAT &&
 420        ctx->API != API_OPENGLES)
 421       return;
 422
 423    if (ctx->varying_vp_inputs != varying_inputs) {
 424       ctx->varying_vp_inputs = varying_inputs;
 425
 426       /* Only the fixed-func generated programs need to use the flag
 427        * and the fixed-func fragment program uses it only if there is also
 428        * a fixed-func vertex program, so this only depends on the latter.
 429        *
 430        * It's okay to check the VP pointer here, because this is called after
 431        * _mesa_update_state in the vbo module. */
 432       if (ctx->VertexProgram._TnlProgram ||
 433           ctx->FragmentProgram._TexEnvProgram) {
 434          ctx->NewState |= _NEW_VARYING_VP_INPUTS;
 435       }
 436       /*printf("%s %x\n", __func__, varying_inputs);*/
 437    }
 438 }
 439
 440
 441 /**
 442  * Used by drivers to tell core Mesa that the driver is going to
 443  * install/ use its own vertex program.  In particular, this will
 444  * prevent generated fragment programs from using state vars instead
 445  * of ordinary varyings/inputs.
 446  */
 447 void
 448 _mesa_set_vp_override(struct gl_context *ctx, GLboolean flag)
 449 {
 450    if (ctx->VertexProgram._Overriden != flag) {
 451       ctx->VertexProgram._Overriden = flag;
 452
 453       /* Set one of the bits which will trigger fragment program
 454        * regeneration:
 455        */
 456       ctx->NewState |= _NEW_PROGRAM;
 457    }
 458 }