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 #include "util/u_format.h"
  30
  31 #include "svga_context.h"
  32 #include "svga_state.h"
  33 #include "svga_cmd.h"
  34 #include "svga_debug.h"
  35 #include "svga_screen.h"
  36 #include "svga_surface.h"
  37 #include "svga_resource_texture.h"
  38
  39
  40 /*
  41  * flush our command buffer after the 8th distinct render target
  42  *
  43  * This helps improve the surface cache behaviour in the face of the
  44  * large number of single-use render targets generated by EXA and the xorg
  45  * state tracker.  Without this we can reference hundreds of individual
  46  * render targets from a command buffer, which leaves little scope for
  47  * sharing or reuse of those targets.
  48  */
  49 #define MAX_RT_PER_BATCH 8
  50
  51
  52
  53 static enum pipe_error
  54 emit_fb_vgpu9(struct svga_context *svga)
  55 {
  56    struct svga_screen *svgascreen = svga_screen(svga->pipe.screen);
  57    const struct pipe_framebuffer_state *curr = &svga->curr.framebuffer;
  58    struct pipe_framebuffer_state *hw = &svga->state.hw_clear.framebuffer;
  59    boolean reemit = svga->rebind.flags.rendertargets;
  60    unsigned i;
  61    enum pipe_error ret;
  62
  63    assert(!svga_have_vgpu10(svga));
  64
  65    /*
  66     * We need to reemit non-null surface bindings, even when they are not
  67     * dirty, to ensure that the resources are paged in.
  68     */
  69
  70    for (i = 0; i < svgascreen->max_color_buffers; i++) {
  71       if ((curr->cbufs[i] != hw->cbufs[i]) || (reemit && hw->cbufs[i])) {
  72          if (svga->curr.nr_fbs++ > MAX_RT_PER_BATCH)
  73             return PIPE_ERROR_OUT_OF_MEMORY;
  74
  75          /* Check to see if we need to propagate the render target surface */
  76          if (hw->cbufs[i] && svga_surface_needs_propagation(hw->cbufs[i]))
  77             svga_propagate_surface(svga, hw->cbufs[i], TRUE);
  78
  79          ret = SVGA3D_SetRenderTarget(svga->swc, SVGA3D_RT_COLOR0 + i,
  80                                       curr->cbufs[i]);
  81          if (ret != PIPE_OK)
  82             return ret;
  83
  84          pipe_surface_reference(&hw->cbufs[i], curr->cbufs[i]);
  85       }
  86
  87       /* Set the rendered-to flag */
  88       struct pipe_surface *s = curr->cbufs[i];
  89       if (s) {
  90          svga_set_texture_rendered_to(svga_texture(s->texture),
  91                                       s->u.tex.first_layer, s->u.tex.level);
  92       }
  93    }
  94
  95    if ((curr->zsbuf != hw->zsbuf) || (reemit && hw->zsbuf)) {
  96       ret = SVGA3D_SetRenderTarget(svga->swc, SVGA3D_RT_DEPTH, curr->zsbuf);
  97       if (ret != PIPE_OK)
  98          return ret;
  99
 100       /* Check to see if we need to propagate the depth stencil surface */
 101       if (hw->zsbuf && svga_surface_needs_propagation(hw->zsbuf))
 102          svga_propagate_surface(svga, hw->zsbuf, TRUE);
 103
 104       if (curr->zsbuf &&
 105           util_format_is_depth_and_stencil(curr->zsbuf->format)) {
 106          ret = SVGA3D_SetRenderTarget(svga->swc, SVGA3D_RT_STENCIL,
 107                                       curr->zsbuf);
 108          if (ret != PIPE_OK)
 109             return ret;
 110       }
 111       else {
 112          ret = SVGA3D_SetRenderTarget(svga->swc, SVGA3D_RT_STENCIL, NULL);
 113          if (ret != PIPE_OK)
 114             return ret;
 115       }
 116
 117       pipe_surface_reference(&hw->zsbuf, curr->zsbuf);
 118
 119       /* Set the rendered-to flag */
 120       struct pipe_surface *s = curr->zsbuf;
 121       if (s) {
 122          svga_set_texture_rendered_to(svga_texture(s->texture),
 123                                       s->u.tex.first_layer, s->u.tex.level);
 124       }
 125    }
 126
 127    return PIPE_OK;
 128 }
 129
 130
 131 /*
 132  * Rebind rendertargets.
 133  *
 134  * Similar to emit_framebuffer, but without any state checking/update.
 135  *
 136  * Called at the beginning of every new command buffer to ensure that
 137  * non-dirty rendertargets are properly paged-in.
 138  */
 139 static enum pipe_error
 140 svga_reemit_framebuffer_bindings_vgpu9(struct svga_context *svga)
 141 {
 142    struct svga_screen *svgascreen = svga_screen(svga->pipe.screen);
 143    struct pipe_framebuffer_state *hw = &svga->state.hw_clear.framebuffer;
 144    unsigned i;
 145    enum pipe_error ret;
 146
 147    assert(!svga_have_vgpu10(svga));
 148
 149    for (i = 0; i < svgascreen->max_color_buffers; i++) {
 150       if (hw->cbufs[i]) {
 151          ret = SVGA3D_SetRenderTarget(svga->swc, SVGA3D_RT_COLOR0 + i,
 152                                       hw->cbufs[i]);
 153          if (ret != PIPE_OK) {
 154             return ret;
 155          }
 156       }
 157    }
 158
 159    if (hw->zsbuf) {
 160       ret = SVGA3D_SetRenderTarget(svga->swc, SVGA3D_RT_DEPTH, hw->zsbuf);
 161       if (ret != PIPE_OK) {
 162          return ret;
 163       }
 164
 165       if (hw->zsbuf &&
 166           util_format_is_depth_and_stencil(hw->zsbuf->format)) {
 167          ret = SVGA3D_SetRenderTarget(svga->swc, SVGA3D_RT_STENCIL, hw->zsbuf);
 168          if (ret != PIPE_OK) {
 169             return ret;
 170          }
 171       }
 172       else {
 173          ret = SVGA3D_SetRenderTarget(svga->swc, SVGA3D_RT_STENCIL, NULL);
 174          if (ret != PIPE_OK) {
 175             return ret;
 176          }
 177       }
 178    }
 179
 180    return PIPE_OK;
 181 }
 182
 183
 184
 185 static enum pipe_error
 186 emit_fb_vgpu10(struct svga_context *svga)
 187 {
 188    const struct svga_screen *ss = svga_screen(svga->pipe.screen);
 189    struct pipe_surface *rtv[SVGA3D_MAX_RENDER_TARGETS];
 190    struct pipe_surface *dsv;
 191    struct pipe_framebuffer_state *curr = &svga->curr.framebuffer;
 192    struct pipe_framebuffer_state *hw = &svga->state.hw_clear.framebuffer;
 193    const unsigned num_color = MAX2(curr->nr_cbufs, hw->nr_cbufs);
 194    int last_rtv = -1;
 195    unsigned i;
 196    enum pipe_error ret = PIPE_OK;
 197
 198    assert(svga_have_vgpu10(svga));
 199
 200    /* Reset the has_backed_views flag.
 201     * The flag is set in svga_validate_surface_view() if
 202     * a backed surface view is used.
 203     */
 204    svga->state.hw_draw.has_backed_views = FALSE;
 205
 206    /* Setup render targets array.  Note that we loop over the max of the
 207     * number of previously bound buffers and the new buffers to unbind
 208     * any previously bound buffers when the new number of buffers is less
 209     * than the old number of buffers.
 210     */
 211    for (i = 0; i < num_color; i++) {
 212       if (curr->cbufs[i]) {
 213          struct pipe_surface *s = curr->cbufs[i];
 214
 215          rtv[i] = svga_validate_surface_view(svga, svga_surface(s));
 216          if (rtv[i] == NULL) {
 217             return PIPE_ERROR_OUT_OF_MEMORY;
 218          }
 219
 220          assert(svga_surface(rtv[i])->view_id != SVGA3D_INVALID_ID);
 221          last_rtv = i;
 222
 223          /* Set the rendered-to flag */
 224          svga_set_texture_rendered_to(svga_texture(s->texture),
 225                                       s->u.tex.first_layer, s->u.tex.level);
 226       }
 227       else {
 228          rtv[i] = NULL;
 229       }
 230    }
 231
 232    /* Setup depth stencil view */
 233    if (curr->zsbuf) {
 234       struct pipe_surface *s = curr->zsbuf;
 235
 236       dsv = svga_validate_surface_view(svga, svga_surface(curr->zsbuf));
 237       if (!dsv) {
 238          return PIPE_ERROR_OUT_OF_MEMORY;
 239       }
 240
 241       /* Set the rendered-to flag */
 242       svga_set_texture_rendered_to(svga_texture(s->texture),
 243                                       s->u.tex.first_layer, s->u.tex.level);
 244    }
 245    else {
 246       dsv = NULL;
 247    }
 248
 249    /* avoid emitting redundant SetRenderTargets command */
 250    if ((num_color != svga->state.hw_clear.num_rendertargets) ||
 251        (dsv != svga->state.hw_clear.dsv) ||
 252        memcmp(rtv, svga->state.hw_clear.rtv, num_color * sizeof(rtv[0]))) {
 253
 254       ret = SVGA3D_vgpu10_SetRenderTargets(svga->swc, num_color, rtv, dsv);
 255       if (ret != PIPE_OK)
 256          return ret;
 257
 258       /* number of render targets sent to the device, not including trailing
 259        * unbound render targets.
 260        */
 261       svga->state.hw_clear.num_rendertargets = last_rtv + 1;
 262       svga->state.hw_clear.dsv = dsv;
 263       memcpy(svga->state.hw_clear.rtv, rtv, num_color * sizeof(rtv[0]));
 264
 265       for (i = 0; i < ss->max_color_buffers; i++) {
 266          if (hw->cbufs[i] != curr->cbufs[i]) {
 267             /* propagate the backed view surface before unbinding it */
 268             if (hw->cbufs[i] && svga_surface(hw->cbufs[i])->backed) {
 269                svga_propagate_surface(svga,
 270                                       &svga_surface(hw->cbufs[i])->backed->base,
 271                                       TRUE);
 272             }
 273             pipe_surface_reference(&hw->cbufs[i], curr->cbufs[i]);
 274          }
 275       }
 276       hw->nr_cbufs = curr->nr_cbufs;
 277
 278       if (hw->zsbuf != curr->zsbuf) {
 279          /* propagate the backed view surface before unbinding it */
 280          if (hw->zsbuf && svga_surface(hw->zsbuf)->backed) {
 281             svga_propagate_surface(svga, &svga_surface(hw->zsbuf)->backed->base,
 282                                    TRUE);
 283          }
 284          pipe_surface_reference(&hw->zsbuf, curr->zsbuf);
 285       }
 286    }
 287
 288    return ret;
 289 }
 290
 291
 292 static enum pipe_error
 293 emit_framebuffer(struct svga_context *svga, unsigned dirty)
 294 {
 295    if (svga_have_vgpu10(svga)) {
 296       return emit_fb_vgpu10(svga);
 297    }
 298    else {
 299       return emit_fb_vgpu9(svga);
 300    }
 301 }
 302
 303
 304 /*
 305  * Rebind rendertargets.
 306  *
 307  * Similar to emit_framebuffer, but without any state checking/update.
 308  *
 309  * Called at the beginning of every new command buffer to ensure that
 310  * non-dirty rendertargets are properly paged-in.
 311  */
 312 enum pipe_error
 313 svga_reemit_framebuffer_bindings(struct svga_context *svga)
 314 {
 315    enum pipe_error ret;
 316
 317    assert(svga->rebind.flags.rendertargets);
 318
 319    if (svga_have_vgpu10(svga)) {
 320       ret = emit_fb_vgpu10(svga);
 321    }
 322    else {
 323       ret = svga_reemit_framebuffer_bindings_vgpu9(svga);
 324    }
 325
 326    svga->rebind.flags.rendertargets = FALSE;
 327
 328    return ret;
 329 }
 330
 331
 332 /*
 333  * Send a private allocation command to page in rendertargets resource.
 334  */
 335 enum pipe_error
 336 svga_rebind_framebuffer_bindings(struct svga_context *svga)
 337 {
 338    struct svga_hw_clear_state *hw = &svga->state.hw_clear;
 339    unsigned i;
 340    enum pipe_error ret;
 341
 342    assert(svga_have_vgpu10(svga));
 343
 344    if (!svga->rebind.flags.rendertargets)
 345       return PIPE_OK;
 346
 347    for (i = 0; i < hw->num_rendertargets; i++) {
 348       if (hw->rtv[i]) {
 349          ret = svga->swc->resource_rebind(svga->swc,
 350                                           svga_surface(hw->rtv[i])->handle,
 351                                           NULL,
 352                                           SVGA_RELOC_WRITE);
 353          if (ret != PIPE_OK)
 354             return ret;
 355       }
 356    }
 357
 358    if (hw->dsv) {
 359       ret = svga->swc->resource_rebind(svga->swc,
 360                                        svga_surface(hw->dsv)->handle,
 361                                        NULL,
 362                                        SVGA_RELOC_WRITE);
 363       if (ret != PIPE_OK)
 364          return ret;
 365    }
 366
 367    svga->rebind.flags.rendertargets = 0;
 368
 369    return PIPE_OK;
 370 }
 371
 372
 373 struct svga_tracked_state svga_hw_framebuffer =
 374 {
 375    "hw framebuffer state",
 376    SVGA_NEW_FRAME_BUFFER,
 377    emit_framebuffer
 378 };
 379
 380
 381
 382
 383 /***********************************************************************
 384  */
 385
 386 static enum pipe_error
 387 emit_viewport( struct svga_context *svga,
 388                unsigned dirty )
 389 {
 390    const struct pipe_viewport_state *viewport = &svga->curr.viewport;
 391    struct svga_prescale prescale;
 392    SVGA3dRect rect;
 393    /* Not sure if this state is relevant with POSITIONT.  Probably
 394     * not, but setting to 0,1 avoids some state pingponging.
 395     */
 396    float range_min = 0.0;
 397    float range_max = 1.0;
 398    float flip = -1.0;
 399    boolean degenerate = FALSE;
 400    boolean invertY = FALSE;
 401    enum pipe_error ret;
 402
 403    float fb_width = (float) svga->curr.framebuffer.width;
 404    float fb_height = (float) svga->curr.framebuffer.height;
 405
 406    float fx =        viewport->scale[0] * -1.0f + viewport->translate[0];
 407    float fy = flip * viewport->scale[1] * -1.0f + viewport->translate[1];
 408    float fw =        viewport->scale[0] * 2.0f;
 409    float fh = flip * viewport->scale[1] * 2.0f;
 410    boolean emit_vgpu10_viewport = FALSE;
 411
 412    memset( &prescale, 0, sizeof(prescale) );
 413
 414    /* Examine gallium viewport transformation and produce a screen
 415     * rectangle and possibly vertex shader pre-transformation to
 416     * get the same results.
 417     */
 418
 419    SVGA_DBG(DEBUG_VIEWPORT,
 420             "\ninitial %f,%f %fx%f\n",
 421             fx,
 422             fy,
 423             fw,
 424             fh);
 425
 426    prescale.scale[0] = 1.0;
 427    prescale.scale[1] = 1.0;
 428    prescale.scale[2] = 1.0;
 429    prescale.scale[3] = 1.0;
 430    prescale.translate[0] = 0;
 431    prescale.translate[1] = 0;
 432    prescale.translate[2] = 0;
 433    prescale.translate[3] = 0;
 434
 435    /* Enable prescale to adjust vertex positions to match
 436       VGPU10 convention only if rasterization is enabled.
 437     */
 438    if (svga->curr.rast && svga->curr.rast->templ.rasterizer_discard) {
 439       degenerate = TRUE;
 440       goto out;
 441    } else {
 442       prescale.enabled = TRUE;
 443    }
 444
 445    if (fw < 0) {
 446       prescale.scale[0] *= -1.0f;
 447       prescale.translate[0] += -fw;
 448       fw = -fw;
 449       fx = viewport->scale[0] * 1.0f + viewport->translate[0];
 450    }
 451
 452    if (fh < 0.0) {
 453       if (svga_have_vgpu10(svga)) {
 454          /* floating point viewport params below */
 455          prescale.translate[1] = fh + fy * 2.0f;
 456       }
 457       else {
 458          /* integer viewport params below */
 459          prescale.translate[1] = fh - 1.0f + fy * 2.0f;
 460       }
 461       fh = -fh;
 462       fy -= fh;
 463       prescale.scale[1] = -1.0f;
 464       invertY = TRUE;
 465    }
 466
 467    if (fx < 0) {
 468       prescale.translate[0] += fx;
 469       prescale.scale[0] *= fw / (fw + fx);
 470       fw += fx;
 471       fx = 0.0f;
 472    }
 473
 474    if (fy < 0) {
 475       if (invertY) {
 476          prescale.translate[1] -= fy;
 477       }
 478       else {
 479          prescale.translate[1] += fy;
 480       }
 481       prescale.scale[1] *= fh / (fh + fy);
 482       fh += fy;
 483       fy = 0.0f;
 484    }
 485
 486    if (fx + fw > fb_width) {
 487       prescale.scale[0] *= fw / (fb_width - fx);
 488       prescale.translate[0] -= fx * (fw / (fb_width - fx));
 489       prescale.translate[0] += fx;
 490       fw = fb_width - fx;
 491    }
 492
 493    if (fy + fh > fb_height) {
 494       prescale.scale[1] *= fh / (fb_height - fy);
 495       if (invertY) {
 496          float in = fb_height - fy;       /* number of vp pixels inside view */
 497          float out = fy + fh - fb_height; /* number of vp pixels out of view */
 498          prescale.translate[1] += fy * out / in;
 499       }
 500       else {
 501          prescale.translate[1] -= fy * (fh / (fb_height - fy));
 502          prescale.translate[1] += fy;
 503       }
 504       fh = fb_height - fy;
 505    }
 506
 507    if (fw < 0 || fh < 0) {
 508       fw = fh = fx = fy = 0;
 509       degenerate = TRUE;
 510       goto out;
 511    }
 512
 513    /* D3D viewport is integer space.  Convert fx,fy,etc. to
 514     * integers.
 515     *
 516     * TODO: adjust pretranslate correct for any subpixel error
 517     * introduced converting to integers.
 518     */
 519    rect.x = (uint32) fx;
 520    rect.y = (uint32) fy;
 521    rect.w = (uint32) fw;
 522    rect.h = (uint32) fh;
 523
 524    SVGA_DBG(DEBUG_VIEWPORT,
 525             "viewport error %f,%f %fx%f\n",
 526             fabs((float)rect.x - fx),
 527             fabs((float)rect.y - fy),
 528             fabs((float)rect.w - fw),
 529             fabs((float)rect.h - fh));
 530
 531    SVGA_DBG(DEBUG_VIEWPORT,
 532             "viewport %d,%d %dx%d\n",
 533             rect.x,
 534             rect.y,
 535             rect.w,
 536             rect.h);
 537
 538    /* Finally, to get GL rasterization rules, need to tweak the
 539     * screen-space coordinates slightly relative to D3D which is
 540     * what hardware implements natively.
 541     */
 542    if (svga->curr.rast && svga->curr.rast->templ.half_pixel_center) {
 543       float adjust_x = 0.0;
 544       float adjust_y = 0.0;
 545
 546       if (svga_have_vgpu10(svga)) {
 547          /* Normally, we don't have to do any sub-pixel coordinate
 548           * adjustments for VGPU10.  But when we draw wide points with
 549           * a GS we need an X adjustment in order to be conformant.
 550           */
 551          if (svga->curr.reduced_prim == PIPE_PRIM_POINTS &&
 552              svga->curr.rast->pointsize > 1.0f) {
 553             adjust_x = 0.5;
 554          }
 555       }
 556       else {
 557          switch (svga->curr.reduced_prim) {
 558          case PIPE_PRIM_POINTS:
 559             adjust_x = -0.375;
 560             adjust_y = -0.75;
 561             break;
 562          case PIPE_PRIM_LINES:
 563             adjust_x = -0.5;
 564             adjust_y = 0;
 565             break;
 566          case PIPE_PRIM_TRIANGLES:
 567             adjust_x = -0.5;
 568             adjust_y = -0.5;
 569             break;
 570          default:
 571             /* nothing */
 572             break;
 573          }
 574       }
 575
 576       if (invertY)
 577          adjust_y = -adjust_y;
 578
 579       prescale.translate[0] += adjust_x;
 580       prescale.translate[1] += adjust_y;
 581       prescale.translate[2] = 0.5; /* D3D clip space */
 582       prescale.scale[2]     = 0.5; /* D3D clip space */
 583    }
 584
 585    range_min = viewport->scale[2] * -1.0f + viewport->translate[2];
 586    range_max = viewport->scale[2] *  1.0f + viewport->translate[2];
 587
 588    /* D3D (and by implication SVGA) doesn't like dealing with zmax
 589     * less than zmin.  Detect that case, flip the depth range and
 590     * invert our z-scale factor to achieve the same effect.
 591     */
 592    if (range_min > range_max) {
 593       float range_tmp;
 594       range_tmp = range_min;
 595       range_min = range_max;
 596       range_max = range_tmp;
 597       prescale.scale[2] = -prescale.scale[2];
 598    }
 599
 600    /* If zmin is less than 0, clamp zmin to 0 and adjust the prescale.
 601     * zmin can be set to -1 when viewport->scale[2] is set to 1 and
 602     * viewport->translate[2] is set to 0 in the blit code.
 603     */
 604    if (range_min < 0.0f) {
 605       range_min = -0.5f * viewport->scale[2] + 0.5f + viewport->translate[2];
 606       range_max = 0.5f * viewport->scale[2] + 0.5f + viewport->translate[2];
 607       prescale.scale[2] *= 2.0f;
 608       prescale.translate[2] -= 0.5f;
 609    }
 610
 611    if (prescale.enabled) {
 612       float H[2];
 613       float J[2];
 614       int i;
 615
 616       SVGA_DBG(DEBUG_VIEWPORT,
 617                "prescale %f,%f %fx%f\n",
 618                prescale.translate[0],
 619                prescale.translate[1],
 620                prescale.scale[0],
 621                prescale.scale[1]);
 622
 623       H[0] = (float)rect.w / 2.0f;
 624       H[1] = -(float)rect.h / 2.0f;
 625       J[0] = (float)rect.x + (float)rect.w / 2.0f;
 626       J[1] = (float)rect.y + (float)rect.h / 2.0f;
 627
 628       SVGA_DBG(DEBUG_VIEWPORT,
 629                "H %f,%f\n"
 630                "J %fx%f\n",
 631                H[0],
 632                H[1],
 633                J[0],
 634                J[1]);
 635
 636       /* Adjust prescale to take into account the fact that it is
 637        * going to be applied prior to the perspective divide and
 638        * viewport transformation.
 639        *
 640        * Vwin = H(Vc/Vc.w) + J
 641        *
 642        * We want to tweak Vwin with scale and translation from above,
 643        * as in:
 644        *
 645        * Vwin' = S Vwin + T
 646        *
 647        * But we can only modify the values at Vc.  Plugging all the
 648        * above together, and rearranging, eventually we get:
 649        *
 650        *   Vwin' = H(Vc'/Vc'.w) + J
 651        * where:
 652        *   Vc' = SVc + KVc.w
 653        *   K = (T + (S-1)J) / H
 654        *
 655        * Overwrite prescale.translate with values for K:
 656        */
 657       for (i = 0; i < 2; i++) {
 658          prescale.translate[i] = ((prescale.translate[i] +
 659                                    (prescale.scale[i] - 1.0f) * J[i]) / H[i]);
 660       }
 661
 662       SVGA_DBG(DEBUG_VIEWPORT,
 663                "clipspace %f,%f %fx%f\n",
 664                prescale.translate[0],
 665                prescale.translate[1],
 666                prescale.scale[0],
 667                prescale.scale[1]);
 668    }
 669
 670 out:
 671    if (degenerate) {
 672       rect.x = 0;
 673       rect.y = 0;
 674       rect.w = 1;
 675       rect.h = 1;
 676       prescale.enabled = FALSE;
 677    }
 678
 679    if (!svga_rects_equal(&rect, &svga->state.hw_clear.viewport)) {
 680       if (svga_have_vgpu10(svga)) {
 681          emit_vgpu10_viewport = TRUE;
 682       }
 683       else {
 684          ret = SVGA3D_SetViewport(svga->swc, &rect);
 685          if (ret != PIPE_OK)
 686             return ret;
 687
 688          svga->state.hw_clear.viewport = rect;
 689       }
 690    }
 691
 692    if (svga->state.hw_clear.depthrange.zmin != range_min ||
 693        svga->state.hw_clear.depthrange.zmax != range_max)
 694    {
 695       if (svga_have_vgpu10(svga)) {
 696          emit_vgpu10_viewport = TRUE;
 697       }
 698       else {
 699          ret = SVGA3D_SetZRange(svga->swc, range_min, range_max );
 700          if (ret != PIPE_OK)
 701             return ret;
 702
 703          svga->state.hw_clear.depthrange.zmin = range_min;
 704          svga->state.hw_clear.depthrange.zmax = range_max;
 705       }
 706    }
 707
 708    if (emit_vgpu10_viewport) {
 709       SVGA3dViewport vp;
 710       vp.x = (float) rect.x;
 711       vp.y = (float) rect.y;
 712       vp.width = (float) rect.w;
 713       vp.height = (float) rect.h;
 714       vp.minDepth = range_min;
 715       vp.maxDepth = range_max;
 716       ret = SVGA3D_vgpu10_SetViewports(svga->swc, 1, &vp);
 717       if (ret != PIPE_OK)
 718          return ret;
 719
 720       svga->state.hw_clear.viewport = rect;
 721
 722       svga->state.hw_clear.depthrange.zmin = range_min;
 723       svga->state.hw_clear.depthrange.zmax = range_max;
 724    }
 725
 726    if (memcmp(&prescale, &svga->state.hw_clear.prescale, sizeof prescale) != 0) {
 727       svga->dirty |= SVGA_NEW_PRESCALE;
 728       svga->state.hw_clear.prescale = prescale;
 729    }
 730
 731    return PIPE_OK;
 732 }
 733
 734
 735 struct svga_tracked_state svga_hw_viewport =
 736 {
 737    "hw viewport state",
 738    ( SVGA_NEW_FRAME_BUFFER |
 739      SVGA_NEW_VIEWPORT |
 740      SVGA_NEW_RAST |
 741      SVGA_NEW_REDUCED_PRIMITIVE ),
 742    emit_viewport
 743 };
 744
 745
 746 /***********************************************************************
 747  * Scissor state
 748  */
 749 static enum pipe_error
 750 emit_scissor_rect( struct svga_context *svga,
 751                    unsigned dirty )
 752 {
 753    const struct pipe_scissor_state *scissor = &svga->curr.scissor;
 754
 755    if (svga_have_vgpu10(svga)) {
 756       SVGASignedRect rect;
 757
 758       rect.left = scissor->minx;
 759       rect.top = scissor->miny;
 760       rect.right = scissor->maxx;
 761       rect.bottom = scissor->maxy;
 762
 763       return SVGA3D_vgpu10_SetScissorRects(svga->swc, 1, &rect);
 764    }
 765    else {
 766       SVGA3dRect rect;
 767
 768       rect.x = scissor->minx;
 769       rect.y = scissor->miny;
 770       rect.w = scissor->maxx - scissor->minx; /* + 1 ?? */
 771       rect.h = scissor->maxy - scissor->miny; /* + 1 ?? */
 772
 773       return SVGA3D_SetScissorRect(svga->swc, &rect);
 774    }
 775 }
 776
 777
 778 struct svga_tracked_state svga_hw_scissor =
 779 {
 780    "hw scissor state",
 781    SVGA_NEW_SCISSOR,
 782    emit_scissor_rect
 783 };
 784
 785
 786 /***********************************************************************
 787  * Userclip state
 788  */
 789
 790 static enum pipe_error
 791 emit_clip_planes( struct svga_context *svga,
 792                   unsigned dirty )
 793 {
 794    unsigned i;
 795    enum pipe_error ret;
 796
 797    /* TODO: just emit directly from svga_set_clip_state()?
 798     */
 799    for (i = 0; i < SVGA3D_MAX_CLIP_PLANES; i++) {
 800       /* need to express the plane in D3D-style coordinate space.
 801        * GL coords get converted to D3D coords with the matrix:
 802        * [ 1  0  0  0 ]
 803        * [ 0 -1  0  0 ]
 804        * [ 0  0  2  0 ]
 805        * [ 0  0 -1  1 ]
 806        * Apply that matrix to our plane equation, and invert Y.
 807        */
 808       float a = svga->curr.clip.ucp[i][0];
 809       float b = svga->curr.clip.ucp[i][1];
 810       float c = svga->curr.clip.ucp[i][2];
 811       float d = svga->curr.clip.ucp[i][3];
 812       float plane[4];
 813
 814       plane[0] = a;
 815       plane[1] = b;
 816       plane[2] = 2.0f * c;
 817       plane[3] = d - c;
 818
 819       if (svga_have_vgpu10(svga)) {
 820          //debug_printf("XXX emit DX10 clip plane\n");
 821          ret = PIPE_OK;
 822       }
 823       else {
 824          ret = SVGA3D_SetClipPlane(svga->swc, i, plane);
 825          if (ret != PIPE_OK)
 826             return ret;
 827       }
 828    }
 829
 830    return PIPE_OK;
 831 }
 832
 833
 834 struct svga_tracked_state svga_hw_clip_planes =
 835 {
 836    "hw viewport state",
 837    SVGA_NEW_CLIP,
 838    emit_clip_planes
 839 };