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 "pipe/p_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 #include "svga_hw_reg.h"
  36
  37
  38 /***********************************************************************
  39  * Hardware state update
  40  */
  41
  42
  43 static int emit_framebuffer( struct svga_context *svga,
  44                              unsigned dirty )
  45 {
  46    const struct pipe_framebuffer_state *curr = &svga->curr.framebuffer;
  47    struct pipe_framebuffer_state *hw = &svga->state.hw_clear.framebuffer;
  48    unsigned i;
  49    enum pipe_error ret;
  50
  51    /* XXX: Need shadow state in svga->hw to eliminate redundant
  52     * uploads, especially of NULL buffers.
  53     */
  54
  55    for(i = 0; i < PIPE_MAX_COLOR_BUFS; ++i) {
  56       if (curr->cbufs[i] != hw->cbufs[i]) {
  57          if (svga->curr.nr_fbs++ > 8)
  58             return PIPE_ERROR_OUT_OF_MEMORY;
  59
  60          ret = SVGA3D_SetRenderTarget(svga->swc, SVGA3D_RT_COLOR0 + i, curr->cbufs[i]);
  61          if (ret != PIPE_OK)
  62             return ret;
  63
  64          pipe_surface_reference(&hw->cbufs[i], curr->cbufs[i]);
  65       }
  66    }
  67
  68
  69    if (curr->zsbuf != hw->zsbuf) {
  70       ret = SVGA3D_SetRenderTarget(svga->swc, SVGA3D_RT_DEPTH, curr->zsbuf);
  71       if (ret != PIPE_OK)
  72          return ret;
  73
  74       if (curr->zsbuf &&
  75           curr->zsbuf->format == PIPE_FORMAT_Z24S8_UNORM) {
  76          ret = SVGA3D_SetRenderTarget(svga->swc, SVGA3D_RT_STENCIL, curr->zsbuf);
  77          if (ret != PIPE_OK)
  78             return ret;
  79       }
  80       else {
  81          ret = SVGA3D_SetRenderTarget(svga->swc, SVGA3D_RT_STENCIL, NULL);
  82          if (ret != PIPE_OK)
  83             return ret;
  84       }
  85
  86       pipe_surface_reference(&hw->zsbuf, curr->zsbuf);
  87    }
  88
  89
  90    return 0;
  91 }
  92
  93
  94 struct svga_tracked_state svga_hw_framebuffer =
  95 {
  96    "hw framebuffer state",
  97    SVGA_NEW_FRAME_BUFFER,
  98    emit_framebuffer
  99 };
 100
 101
 102
 103
 104 /***********************************************************************
 105  */
 106
 107 static int emit_viewport( struct svga_context *svga,
 108                           unsigned dirty )
 109 {
 110    const struct pipe_viewport_state *viewport = &svga->curr.viewport;
 111    struct svga_prescale prescale;
 112    SVGA3dRect rect;
 113    /* Not sure if this state is relevant with POSITIONT.  Probably
 114     * not, but setting to 0,1 avoids some state pingponging.
 115     */
 116    float range_min = 0.0;
 117    float range_max = 1.0;
 118    float flip = -1.0;
 119    boolean degenerate = FALSE;
 120    enum pipe_error ret;
 121
 122    float fb_width = svga->curr.framebuffer.width;
 123    float fb_height = svga->curr.framebuffer.height;
 124
 125    memset( &prescale, 0, sizeof(prescale) );
 126
 127    if (svga->curr.rast->templ.bypass_vs_clip_and_viewport) {
 128
 129       /* Avoid POSITIONT as it has a non trivial implementation outside the D3D
 130        * API. Always generate a vertex shader.
 131        */
 132       rect.x = 0;
 133       rect.y = 0;
 134       rect.w = svga->curr.framebuffer.width;
 135       rect.h = svga->curr.framebuffer.height;
 136
 137       prescale.scale[0] = 2.0 / (float)rect.w;
 138       prescale.scale[1] = - 2.0 / (float)rect.h;
 139       prescale.scale[2] = 1.0;
 140       prescale.scale[3] = 1.0;
 141       prescale.translate[0] = -1.0f;
 142       prescale.translate[1] = 1.0f;
 143       prescale.translate[2] = 0;
 144       prescale.translate[3] = 0;
 145       prescale.enabled = TRUE;
 146    } else {
 147
 148       /* Examine gallium viewport transformation and produce a screen
 149        * rectangle and possibly vertex shader pre-transformation to
 150        * get the same results.
 151        */
 152       float fx =        viewport->scale[0] * -1.0 + viewport->translate[0];
 153       float fy = flip * viewport->scale[1] * -1.0 + viewport->translate[1];
 154       float fw =        viewport->scale[0] * 2;
 155       float fh = flip * viewport->scale[1] * 2;
 156
 157       SVGA_DBG(DEBUG_VIEWPORT,
 158                "\ninitial %f,%f %fx%f\n",
 159                fx,
 160                fy,
 161                fw,
 162                fh);
 163
 164       prescale.scale[0] = 1.0;
 165       prescale.scale[1] = 1.0;
 166       prescale.scale[2] = 1.0;
 167       prescale.scale[3] = 1.0;
 168       prescale.translate[0] = 0;
 169       prescale.translate[1] = 0;
 170       prescale.translate[2] = 0;
 171       prescale.translate[3] = 0;
 172       prescale.enabled = TRUE;
 173
 174
 175
 176       if (fw < 0) {
 177          prescale.scale[0] *= -1.0;
 178          prescale.translate[0] += -fw;
 179          fw = -fw;
 180          fx =        viewport->scale[0] * 1.0 + viewport->translate[0];
 181       }
 182
 183       if (fh < 0) {
 184          prescale.scale[1] *= -1.0;
 185          prescale.translate[1] += -fh;
 186          fh = -fh;
 187          fy = flip * viewport->scale[1] * 1.0 + viewport->translate[1];
 188       }
 189
 190       if (fx < 0) {
 191          prescale.translate[0] += fx;
 192          prescale.scale[0] *= fw / (fw + fx);
 193          fw += fx;
 194          fx = 0;
 195       }
 196
 197       if (fy < 0) {
 198          prescale.translate[1] += fy;
 199          prescale.scale[1] *= fh / (fh + fy);
 200          fh += fy;
 201          fy = 0;
 202       }
 203
 204       if (fx + fw > fb_width) {
 205          prescale.scale[0] *= fw / (fb_width - fx);
 206          prescale.translate[0] -= fx * (fw / (fb_width - fx));
 207          prescale.translate[0] += fx;
 208          fw = fb_width - fx;
 209
 210       }
 211
 212       if (fy + fh > fb_height) {
 213          prescale.scale[1] *= fh / (fb_height - fy);
 214          prescale.translate[1] -= fy * (fh / (fb_height - fy));
 215          prescale.translate[1] += fy;
 216          fh = fb_height - fy;
 217       }
 218
 219       if (fw < 0 || fh < 0) {
 220          fw = fh = fx = fy = 0;
 221          degenerate = TRUE;
 222          goto out;
 223       }
 224
 225
 226       /* D3D viewport is integer space.  Convert fx,fy,etc. to
 227        * integers.
 228        *
 229        * TODO: adjust pretranslate correct for any subpixel error
 230        * introduced converting to integers.
 231        */
 232       rect.x = fx;
 233       rect.y = fy;
 234       rect.w = fw;
 235       rect.h = fh;
 236
 237       SVGA_DBG(DEBUG_VIEWPORT,
 238                "viewport error %f,%f %fx%f\n",
 239                fabs((float)rect.x - fx),
 240                fabs((float)rect.y - fy),
 241                fabs((float)rect.w - fw),
 242                fabs((float)rect.h - fh));
 243
 244       SVGA_DBG(DEBUG_VIEWPORT,
 245                "viewport %d,%d %dx%d\n",
 246                rect.x,
 247                rect.y,
 248                rect.w,
 249                rect.h);
 250
 251
 252       /* Finally, to get GL rasterization rules, need to tweak the
 253        * screen-space coordinates slightly relative to D3D which is
 254        * what hardware implements natively.
 255        */
 256       if (svga->curr.rast->templ.gl_rasterization_rules) {
 257          float adjust_x = 0.0;
 258          float adjust_y = 0.0;
 259
 260          switch (svga->curr.reduced_prim) {
 261          case PIPE_PRIM_LINES:
 262             adjust_x = -0.5;
 263             adjust_y = 0;
 264             break;
 265          case PIPE_PRIM_POINTS:
 266          case PIPE_PRIM_TRIANGLES:
 267             adjust_x = -0.375;
 268             adjust_y = -0.5;
 269             break;
 270          }
 271
 272          prescale.translate[0] += adjust_x;
 273          prescale.translate[1] += adjust_y;
 274          prescale.translate[2] = 0.5; /* D3D clip space */
 275          prescale.scale[2]     = 0.5; /* D3D clip space */
 276       }
 277
 278
 279       range_min = viewport->scale[2] * -1.0 + viewport->translate[2];
 280       range_max = viewport->scale[2] *  1.0 + viewport->translate[2];
 281
 282       /* D3D (and by implication SVGA) doesn't like dealing with zmax
 283        * less than zmin.  Detect that case, flip the depth range and
 284        * invert our z-scale factor to achieve the same effect.
 285        */
 286       if (range_min > range_max) {
 287          float range_tmp;
 288          range_tmp = range_min;
 289          range_min = range_max;
 290          range_max = range_tmp;
 291          prescale.scale[2]     = -prescale.scale[2];
 292       }
 293    }
 294
 295    if (prescale.enabled) {
 296       float H[2];
 297       float J[2];
 298       int i;
 299
 300       SVGA_DBG(DEBUG_VIEWPORT,
 301                "prescale %f,%f %fx%f\n",
 302                prescale.translate[0],
 303                prescale.translate[1],
 304                prescale.scale[0],
 305                prescale.scale[1]);
 306
 307       H[0] = (float)rect.w / 2.0;
 308       H[1] = -(float)rect.h / 2.0;
 309       J[0] = (float)rect.x + (float)rect.w / 2.0;
 310       J[1] = (float)rect.y + (float)rect.h / 2.0;
 311
 312       SVGA_DBG(DEBUG_VIEWPORT,
 313                "H %f,%f\n"
 314                "J %fx%f\n",
 315                H[0],
 316                H[1],
 317                J[0],
 318                J[1]);
 319
 320       /* Adjust prescale to take into account the fact that it is
 321        * going to be applied prior to the perspective divide and
 322        * viewport transformation.
 323        *
 324        * Vwin = H(Vc/Vc.w) + J
 325        *
 326        * We want to tweak Vwin with scale and translation from above,
 327        * as in:
 328        *
 329        * Vwin' = S Vwin + T
 330        *
 331        * But we can only modify the values at Vc.  Plugging all the
 332        * above together, and rearranging, eventually we get:
 333        *
 334        *   Vwin' = H(Vc'/Vc'.w) + J
 335        * where:
 336        *   Vc' = SVc + KVc.w
 337        *   K = (T + (S-1)J) / H
 338        *
 339        * Overwrite prescale.translate with values for K:
 340        */
 341       for (i = 0; i < 2; i++) {
 342          prescale.translate[i] = ((prescale.translate[i] +
 343                                    (prescale.scale[i] - 1.0) * J[i]) / H[i]);
 344       }
 345
 346       SVGA_DBG(DEBUG_VIEWPORT,
 347                "clipspace %f,%f %fx%f\n",
 348                prescale.translate[0],
 349                prescale.translate[1],
 350                prescale.scale[0],
 351                prescale.scale[1]);
 352    }
 353
 354 out:
 355    if (degenerate) {
 356       rect.x = 0;
 357       rect.y = 0;
 358       rect.w = 1;
 359       rect.h = 1;
 360       prescale.enabled = FALSE;
 361    }
 362
 363    if (memcmp(&rect, &svga->state.hw_clear.viewport, sizeof(rect)) != 0) {
 364       ret = SVGA3D_SetViewport(svga->swc, &rect);
 365       if(ret != PIPE_OK)
 366          return ret;
 367
 368       memcpy(&svga->state.hw_clear.viewport, &rect, sizeof(rect));
 369       assert(sizeof(rect) == sizeof(svga->state.hw_clear.viewport));
 370    }
 371
 372    if (svga->state.hw_clear.depthrange.zmin != range_min ||
 373        svga->state.hw_clear.depthrange.zmax != range_max)
 374    {
 375       ret = SVGA3D_SetZRange(svga->swc, range_min, range_max );
 376       if(ret != PIPE_OK)
 377          return ret;
 378
 379       svga->state.hw_clear.depthrange.zmin = range_min;
 380       svga->state.hw_clear.depthrange.zmax = range_max;
 381    }
 382
 383    if (memcmp(&prescale, &svga->state.hw_clear.prescale, sizeof prescale) != 0) {
 384       svga->dirty |= SVGA_NEW_PRESCALE;
 385       svga->state.hw_clear.prescale = prescale;
 386    }
 387
 388    return 0;
 389 }
 390
 391
 392 struct svga_tracked_state svga_hw_viewport =
 393 {
 394    "hw viewport state",
 395    ( SVGA_NEW_FRAME_BUFFER |
 396      SVGA_NEW_VIEWPORT |
 397      SVGA_NEW_RAST |
 398      SVGA_NEW_REDUCED_PRIMITIVE ),
 399    emit_viewport
 400 };
 401
 402
 403 /***********************************************************************
 404  * Scissor state
 405  */
 406 static int emit_scissor_rect( struct svga_context *svga,
 407                               unsigned dirty )
 408 {
 409    const struct pipe_scissor_state *scissor = &svga->curr.scissor;
 410    SVGA3dRect rect;
 411
 412    rect.x = scissor->minx;
 413    rect.y = scissor->miny;
 414    rect.w = scissor->maxx - scissor->minx; /* + 1 ?? */
 415    rect.h = scissor->maxy - scissor->miny; /* + 1 ?? */
 416
 417    return SVGA3D_SetScissorRect(svga->swc, &rect);
 418 }
 419
 420
 421 struct svga_tracked_state svga_hw_scissor =
 422 {
 423    "hw scissor state",
 424    SVGA_NEW_SCISSOR,
 425    emit_scissor_rect
 426 };
 427
 428
 429 /***********************************************************************
 430  * Userclip state
 431  */
 432
 433 static int emit_clip_planes( struct svga_context *svga,
 434                              unsigned dirty )
 435 {
 436    unsigned i;
 437    enum pipe_error ret;
 438
 439    /* TODO: just emit directly from svga_set_clip_state()?
 440     */
 441    for (i = 0; i < svga->curr.clip.nr; i++) {
 442       ret = SVGA3D_SetClipPlane( svga->swc,
 443                                  i,
 444                                  svga->curr.clip.ucp[i] );
 445       if(ret != PIPE_OK)
 446          return ret;
 447    }
 448
 449    return 0;
 450 }
 451
 452
 453 struct svga_tracked_state svga_hw_clip_planes =
 454 {
 455    "hw viewport state",
 456    SVGA_NEW_CLIP,
 457    emit_clip_planes
 458 };