src/gallium/drivers/svga/svga_state_framebuffer.c

   1 /**********************************************************
   2  * Copyright 2008-2009 VMware, Inc.  All rights reserved.
   3  *
   4  * Permission is hereby granted, free of charge, to any person
   5  * obtaining a copy of this software and associated documentation
   6  * files (the "Software"), to deal in the Software without
   7  * restriction, including without limitation the rights to use, copy,
   8  * modify, merge, publish, distribute, sublicense, and/or sell copies
   9  * of the Software, and to permit persons to whom the Software is
  10  * furnished to do so, subject to the following conditions:
  11  *
  12  * The above copyright notice and this permission notice shall be
  13  * included in all copies or substantial portions of the Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  16  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  17  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  18  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  19  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  20  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  21  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  22  * SOFTWARE.
  23  *
  24  **********************************************************/
  25
  26 #include "util/u_inlines.h"
  27 #include "pipe/p_defines.h"
  28 #include "util/u_math.h"
  29
  30 #include "svga_context.h"
  31 #include "svga_state.h"
  32 #include "svga_cmd.h"
  33 #include "svga_debug.h"
  34
  35
  36 /***********************************************************************
  37  * Hardware state update
  38  */
  39
  40
  41 static enum pipe_error
  42 emit_framebuffer( struct svga_context *svga,
  43                   unsigned dirty )
  44 {
  45    const struct pipe_framebuffer_state *curr = &svga->curr.framebuffer;
  46    struct pipe_framebuffer_state *hw = &svga->state.hw_clear.framebuffer;
  47    boolean reemit = svga->rebind.rendertargets;
  48    unsigned i;
  49    enum pipe_error ret;
  50
  51    /*
  52     * We need to reemit non-null surface bindings, even when they are not
  53     * dirty, to ensure that the resources are paged in.
  54     */
  55
  56    for(i = 0; i < PIPE_MAX_COLOR_BUFS; ++i) {
  57       if (curr->cbufs[i] != hw->cbufs[i] ||
  58           (reemit && hw->cbufs[i])) {
  59          if (svga->curr.nr_fbs++ > 8)
  60             return PIPE_ERROR_OUT_OF_MEMORY;
  61
  62          ret = SVGA3D_SetRenderTarget(svga->swc, SVGA3D_RT_COLOR0 + i, curr->cbufs[i]);
  63          if (ret != PIPE_OK)
  64             return ret;
  65
  66          pipe_surface_reference(&hw->cbufs[i], curr->cbufs[i]);
  67       }
  68    }
  69
  70
  71    if (curr->zsbuf != hw->zsbuf ||
  72        (reemit && hw->zsbuf)) {
  73       ret = SVGA3D_SetRenderTarget(svga->swc, SVGA3D_RT_DEPTH, curr->zsbuf);
  74       if (ret != PIPE_OK)
  75          return ret;
  76
  77       if (curr->zsbuf &&
  78           curr->zsbuf->format == PIPE_FORMAT_S8_UINT_Z24_UNORM) {
  79          ret = SVGA3D_SetRenderTarget(svga->swc, SVGA3D_RT_STENCIL, curr->zsbuf);
  80          if (ret != PIPE_OK)
  81             return ret;
  82       }
  83       else {
  84          ret = SVGA3D_SetRenderTarget(svga->swc, SVGA3D_RT_STENCIL, NULL);
  85          if (ret != PIPE_OK)
  86             return ret;
  87       }
  88
  89       pipe_surface_reference(&hw->zsbuf, curr->zsbuf);
  90    }
  91
  92    svga->rebind.rendertargets = FALSE;
  93
  94    return PIPE_OK;
  95 }
  96
  97
  98 /*
  99  * Rebind rendertargets.
 100  *
 101  * Similar to emit_framebuffer, but without any state checking/update.
 102  *
 103  * Called at the beginning of every new command buffer to ensure that
 104  * non-dirty rendertargets are properly paged-in.
 105  */
 106 enum pipe_error
 107 svga_reemit_framebuffer_bindings(struct svga_context *svga)
 108 {
 109    struct pipe_framebuffer_state *hw = &svga->state.hw_clear.framebuffer;
 110    unsigned i;
 111    enum pipe_error ret;
 112
 113    assert(svga->rebind.rendertargets);
 114
 115    for (i = 0; i < MIN2(PIPE_MAX_COLOR_BUFS, 8); ++i) {
 116       if (hw->cbufs[i]) {
 117          ret = SVGA3D_SetRenderTarget(svga->swc, SVGA3D_RT_COLOR0 + i, hw->cbufs[i]);
 118          if (ret != PIPE_OK) {
 119             return ret;
 120          }
 121       }
 122    }
 123
 124    if (hw->zsbuf) {
 125       ret = SVGA3D_SetRenderTarget(svga->swc, SVGA3D_RT_DEPTH, hw->zsbuf);
 126       if (ret != PIPE_OK) {
 127          return ret;
 128       }
 129
 130       if (hw->zsbuf &&
 131           hw->zsbuf->format == PIPE_FORMAT_S8_UINT_Z24_UNORM) {
 132          ret = SVGA3D_SetRenderTarget(svga->swc, SVGA3D_RT_STENCIL, hw->zsbuf);
 133          if (ret != PIPE_OK) {
 134             return ret;
 135          }
 136       }
 137       else {
 138          ret = SVGA3D_SetRenderTarget(svga->swc, SVGA3D_RT_STENCIL, NULL);
 139          if (ret != PIPE_OK) {
 140             return ret;
 141          }
 142       }
 143    }
 144
 145    svga->rebind.rendertargets = FALSE;
 146
 147    return PIPE_OK;
 148 }
 149
 150
 151 struct svga_tracked_state svga_hw_framebuffer =
 152 {
 153    "hw framebuffer state",
 154    SVGA_NEW_FRAME_BUFFER,
 155    emit_framebuffer
 156 };
 157
 158
 159
 160
 161 /***********************************************************************
 162  */
 163
 164 static enum pipe_error
 165 emit_viewport( struct svga_context *svga,
 166                unsigned dirty )
 167 {
 168    const struct pipe_viewport_state *viewport = &svga->curr.viewport;
 169    struct svga_prescale prescale;
 170    SVGA3dRect rect;
 171    /* Not sure if this state is relevant with POSITIONT.  Probably
 172     * not, but setting to 0,1 avoids some state pingponging.
 173     */
 174    float range_min = 0.0;
 175    float range_max = 1.0;
 176    float flip = -1.0;
 177    boolean degenerate = FALSE;
 178    boolean invertY = FALSE;
 179    enum pipe_error ret;
 180
 181    float fb_width = (float) svga->curr.framebuffer.width;
 182    float fb_height = (float) svga->curr.framebuffer.height;
 183
 184    float fx =        viewport->scale[0] * -1.0f + viewport->translate[0];
 185    float fy = flip * viewport->scale[1] * -1.0f + viewport->translate[1];
 186    float fw =        viewport->scale[0] * 2.0f;
 187    float fh = flip * viewport->scale[1] * 2.0f;
 188
 189    memset( &prescale, 0, sizeof(prescale) );
 190
 191    /* Examine gallium viewport transformation and produce a screen
 192     * rectangle and possibly vertex shader pre-transformation to
 193     * get the same results.
 194     */
 195
 196    SVGA_DBG(DEBUG_VIEWPORT,
 197             "\ninitial %f,%f %fx%f\n",
 198             fx,
 199             fy,
 200             fw,
 201             fh);
 202
 203    prescale.scale[0] = 1.0;
 204    prescale.scale[1] = 1.0;
 205    prescale.scale[2] = 1.0;
 206    prescale.scale[3] = 1.0;
 207    prescale.translate[0] = 0;
 208    prescale.translate[1] = 0;
 209    prescale.translate[2] = 0;
 210    prescale.translate[3] = 0;
 211    prescale.enabled = TRUE;
 212
 213
 214
 215    if (fw < 0) {
 216       prescale.scale[0] *= -1.0f;
 217       prescale.translate[0] += -fw;
 218       fw = -fw;
 219       fx =        viewport->scale[0] * 1.0f + viewport->translate[0];
 220    }
 221
 222    if (fh < 0.0) {
 223       prescale.translate[1] = fh - 1.0f + fy * 2.0f;
 224       fh = -fh;
 225       fy -= fh;
 226       prescale.scale[1] = -1.0f;
 227       invertY = TRUE;
 228    }
 229
 230    if (fx < 0) {
 231       prescale.translate[0] += fx;
 232       prescale.scale[0] *= fw / (fw + fx);
 233       fw += fx;
 234       fx = 0.0f;
 235    }
 236
 237    if (fy < 0) {
 238       if (invertY) {
 239          prescale.translate[1] -= fy;
 240       }
 241       else {
 242          prescale.translate[1] += fy;
 243       }
 244       prescale.scale[1] *= fh / (fh + fy);
 245       fh += fy;
 246       fy = 0.0f;
 247    }
 248
 249    if (fx + fw > fb_width) {
 250       prescale.scale[0] *= fw / (fb_width - fx);
 251       prescale.translate[0] -= fx * (fw / (fb_width - fx));
 252       prescale.translate[0] += fx;
 253       fw = fb_width - fx;
 254
 255    }
 256
 257    if (fy + fh > fb_height) {
 258       prescale.scale[1] *= fh / (fb_height - fy);
 259       if (invertY) {
 260          float in = fb_height - fy;       /* number of vp pixels inside view */
 261          float out = fy + fh - fb_height; /* number of vp pixels out of view */
 262          prescale.translate[1] += fy * out / in;
 263       }
 264       else {
 265          prescale.translate[1] -= fy * (fh / (fb_height - fy));
 266          prescale.translate[1] += fy;
 267       }
 268       fh = fb_height - fy;
 269    }
 270
 271    if (fw < 0 || fh < 0) {
 272       fw = fh = fx = fy = 0;
 273       degenerate = TRUE;
 274       goto out;
 275    }
 276
 277
 278    /* D3D viewport is integer space.  Convert fx,fy,etc. to
 279     * integers.
 280     *
 281     * TODO: adjust pretranslate correct for any subpixel error
 282     * introduced converting to integers.
 283     */
 284    rect.x = (uint32) fx;
 285    rect.y = (uint32) fy;
 286    rect.w = (uint32) fw;
 287    rect.h = (uint32) fh;
 288
 289    SVGA_DBG(DEBUG_VIEWPORT,
 290             "viewport error %f,%f %fx%f\n",
 291             fabs((float)rect.x - fx),
 292             fabs((float)rect.y - fy),
 293             fabs((float)rect.w - fw),
 294             fabs((float)rect.h - fh));
 295
 296    SVGA_DBG(DEBUG_VIEWPORT,
 297             "viewport %d,%d %dx%d\n",
 298             rect.x,
 299             rect.y,
 300             rect.w,
 301             rect.h);
 302
 303
 304    /* Finally, to get GL rasterization rules, need to tweak the
 305     * screen-space coordinates slightly relative to D3D which is
 306     * what hardware implements natively.
 307     */
 308    if (svga->curr.rast->templ.half_pixel_center) {
 309       float adjust_x = 0.0;
 310       float adjust_y = 0.0;
 311
 312       switch (svga->curr.reduced_prim) {
 313       case PIPE_PRIM_LINES:
 314          adjust_x = -0.5;
 315          adjust_y = 0;
 316          break;
 317       case PIPE_PRIM_POINTS:
 318       case PIPE_PRIM_TRIANGLES:
 319          adjust_x = -0.5;
 320          adjust_y = -0.5;
 321          break;
 322       }
 323
 324       if (invertY)
 325          adjust_y = -adjust_y;
 326
 327       prescale.translate[0] += adjust_x;
 328       prescale.translate[1] += adjust_y;
 329       prescale.translate[2] = 0.5; /* D3D clip space */
 330       prescale.scale[2]     = 0.5; /* D3D clip space */
 331    }
 332
 333
 334    range_min = viewport->scale[2] * -1.0f + viewport->translate[2];
 335    range_max = viewport->scale[2] *  1.0f + viewport->translate[2];
 336
 337    /* D3D (and by implication SVGA) doesn't like dealing with zmax
 338     * less than zmin.  Detect that case, flip the depth range and
 339     * invert our z-scale factor to achieve the same effect.
 340     */
 341    if (range_min > range_max) {
 342       float range_tmp;
 343       range_tmp = range_min;
 344       range_min = range_max;
 345       range_max = range_tmp;
 346       prescale.scale[2]     = -prescale.scale[2];
 347    }
 348
 349    if (prescale.enabled) {
 350       float H[2];
 351       float J[2];
 352       int i;
 353
 354       SVGA_DBG(DEBUG_VIEWPORT,
 355                "prescale %f,%f %fx%f\n",
 356                prescale.translate[0],
 357                prescale.translate[1],
 358                prescale.scale[0],
 359                prescale.scale[1]);
 360
 361       H[0] = (float)rect.w / 2.0f;
 362       H[1] = -(float)rect.h / 2.0f;
 363       J[0] = (float)rect.x + (float)rect.w / 2.0f;
 364       J[1] = (float)rect.y + (float)rect.h / 2.0f;
 365
 366       SVGA_DBG(DEBUG_VIEWPORT,
 367                "H %f,%f\n"
 368                "J %fx%f\n",
 369                H[0],
 370                H[1],
 371                J[0],
 372                J[1]);
 373
 374       /* Adjust prescale to take into account the fact that it is
 375        * going to be applied prior to the perspective divide and
 376        * viewport transformation.
 377        *
 378        * Vwin = H(Vc/Vc.w) + J
 379        *
 380        * We want to tweak Vwin with scale and translation from above,
 381        * as in:
 382        *
 383        * Vwin' = S Vwin + T
 384        *
 385        * But we can only modify the values at Vc.  Plugging all the
 386        * above together, and rearranging, eventually we get:
 387        *
 388        *   Vwin' = H(Vc'/Vc'.w) + J
 389        * where:
 390        *   Vc' = SVc + KVc.w
 391        *   K = (T + (S-1)J) / H
 392        *
 393        * Overwrite prescale.translate with values for K:
 394        */
 395       for (i = 0; i < 2; i++) {
 396          prescale.translate[i] = ((prescale.translate[i] +
 397                                    (prescale.scale[i] - 1.0f) * J[i]) / H[i]);
 398       }
 399
 400       SVGA_DBG(DEBUG_VIEWPORT,
 401                "clipspace %f,%f %fx%f\n",
 402                prescale.translate[0],
 403                prescale.translate[1],
 404                prescale.scale[0],
 405                prescale.scale[1]);
 406    }
 407
 408 out:
 409    if (degenerate) {
 410       rect.x = 0;
 411       rect.y = 0;
 412       rect.w = 1;
 413       rect.h = 1;
 414       prescale.enabled = FALSE;
 415    }
 416
 417    if (memcmp(&rect, &svga->state.hw_clear.viewport, sizeof(rect)) != 0) {
 418       ret = SVGA3D_SetViewport(svga->swc, &rect);
 419       if(ret != PIPE_OK)
 420          return ret;
 421
 422       memcpy(&svga->state.hw_clear.viewport, &rect, sizeof(rect));
 423       assert(sizeof(rect) == sizeof(svga->state.hw_clear.viewport));
 424    }
 425
 426    if (svga->state.hw_clear.depthrange.zmin != range_min ||
 427        svga->state.hw_clear.depthrange.zmax != range_max)
 428    {
 429       ret = SVGA3D_SetZRange(svga->swc, range_min, range_max );
 430       if(ret != PIPE_OK)
 431          return ret;
 432
 433       svga->state.hw_clear.depthrange.zmin = range_min;
 434       svga->state.hw_clear.depthrange.zmax = range_max;
 435    }
 436
 437    if (memcmp(&prescale, &svga->state.hw_clear.prescale, sizeof prescale) != 0) {
 438       svga->dirty |= SVGA_NEW_PRESCALE;
 439       svga->state.hw_clear.prescale = prescale;
 440    }
 441
 442    return PIPE_OK;
 443 }
 444
 445
 446 struct svga_tracked_state svga_hw_viewport =
 447 {
 448    "hw viewport state",
 449    ( SVGA_NEW_FRAME_BUFFER |
 450      SVGA_NEW_VIEWPORT |
 451      SVGA_NEW_RAST |
 452      SVGA_NEW_REDUCED_PRIMITIVE ),
 453    emit_viewport
 454 };
 455
 456
 457 /***********************************************************************
 458  * Scissor state
 459  */
 460 static enum pipe_error
 461 emit_scissor_rect( struct svga_context *svga,
 462                    unsigned dirty )
 463 {
 464    const struct pipe_scissor_state *scissor = &svga->curr.scissor;
 465    SVGA3dRect rect;
 466
 467    rect.x = scissor->minx;
 468    rect.y = scissor->miny;
 469    rect.w = scissor->maxx - scissor->minx; /* + 1 ?? */
 470    rect.h = scissor->maxy - scissor->miny; /* + 1 ?? */
 471
 472    return SVGA3D_SetScissorRect(svga->swc, &rect);
 473 }
 474
 475
 476 struct svga_tracked_state svga_hw_scissor =
 477 {
 478    "hw scissor state",
 479    SVGA_NEW_SCISSOR,
 480    emit_scissor_rect
 481 };
 482
 483
 484 /***********************************************************************
 485  * Userclip state
 486  */
 487
 488 static enum pipe_error
 489 emit_clip_planes( struct svga_context *svga,
 490                   unsigned dirty )
 491 {
 492    unsigned i;
 493    enum pipe_error ret;
 494
 495    /* TODO: just emit directly from svga_set_clip_state()?
 496     */
 497    for (i = 0; i < SVGA3D_MAX_CLIP_PLANES; i++) {
 498       /* need to express the plane in D3D-style coordinate space.
 499        * GL coords get converted to D3D coords with the matrix:
 500        * [ 1  0  0  0 ]
 501        * [ 0 -1  0  0 ]
 502        * [ 0  0  2  0 ]
 503        * [ 0  0 -1  1 ]
 504        * Apply that matrix to our plane equation, and invert Y.
 505        */
 506       float a = svga->curr.clip.ucp[i][0];
 507       float b = svga->curr.clip.ucp[i][1];
 508       float c = svga->curr.clip.ucp[i][2];
 509       float d = svga->curr.clip.ucp[i][3];
 510       float plane[4];
 511
 512       plane[0] = a;
 513       plane[1] = b;
 514       plane[2] = 2.0f * c;
 515       plane[3] = d - c;
 516
 517       ret = SVGA3D_SetClipPlane(svga->swc, i, plane);
 518       if(ret != PIPE_OK)
 519          return ret;
 520    }
 521
 522    return PIPE_OK;
 523 }
 524
 525
 526 struct svga_tracked_state svga_hw_clip_planes =
 527 {
 528    "hw viewport state",
 529    SVGA_NEW_CLIP,
 530    emit_clip_planes
 531 };