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