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 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    boolean reemit = !!(dirty & SVGA_NEW_COMMAND_BUFFER);
  47    unsigned i;
  48    enum pipe_error ret;
  49
  50    /*
  51     * We need to reemit non-null surface bindings, even when they are not
  52     * dirty, to ensure that the resources are paged in.
  53     */
  54
  55    for(i = 0; i < PIPE_MAX_COLOR_BUFS; ++i) {
  56       if (curr->cbufs[i] != hw->cbufs[i] ||
  57           (reemit && hw->cbufs[i])) {
  58          if (svga->curr.nr_fbs++ > 8)
  59             return PIPE_ERROR_OUT_OF_MEMORY;
  60
  61          ret = SVGA3D_SetRenderTarget(svga->swc, SVGA3D_RT_COLOR0 + i, curr->cbufs[i]);
  62          if (ret != PIPE_OK)
  63             return ret;
  64
  65          pipe_surface_reference(&hw->cbufs[i], curr->cbufs[i]);
  66       }
  67    }
  68
  69
  70    if (curr->zsbuf != hw->zsbuf ||
  71        (reemit && hw->zsbuf)) {
  72       ret = SVGA3D_SetRenderTarget(svga->swc, SVGA3D_RT_DEPTH, curr->zsbuf);
  73       if (ret != PIPE_OK)
  74          return ret;
  75
  76       if (curr->zsbuf &&
  77           curr->zsbuf->format == PIPE_FORMAT_S8_USCALED_Z24_UNORM) {
  78          ret = SVGA3D_SetRenderTarget(svga->swc, SVGA3D_RT_STENCIL, curr->zsbuf);
  79          if (ret != PIPE_OK)
  80             return ret;
  81       }
  82       else {
  83          ret = SVGA3D_SetRenderTarget(svga->swc, SVGA3D_RT_STENCIL, NULL);
  84          if (ret != PIPE_OK)
  85             return ret;
  86       }
  87
  88       pipe_surface_reference(&hw->zsbuf, curr->zsbuf);
  89    }
  90
  91
  92    return 0;
  93 }
  94
  95
  96 struct svga_tracked_state svga_hw_framebuffer =
  97 {
  98    "hw framebuffer state",
  99    SVGA_NEW_FRAME_BUFFER |
 100    SVGA_NEW_COMMAND_BUFFER,
 101    emit_framebuffer
 102 };
 103
 104
 105
 106
 107 /***********************************************************************
 108  */
 109
 110 static int emit_viewport( struct svga_context *svga,
 111                           unsigned dirty )
 112 {
 113    const struct pipe_viewport_state *viewport = &svga->curr.viewport;
 114    struct svga_prescale prescale;
 115    SVGA3dRect rect;
 116    /* Not sure if this state is relevant with POSITIONT.  Probably
 117     * not, but setting to 0,1 avoids some state pingponging.
 118     */
 119    float range_min = 0.0;
 120    float range_max = 1.0;
 121    float flip = -1.0;
 122    boolean degenerate = FALSE;
 123    enum pipe_error ret;
 124
 125    float fb_width = svga->curr.framebuffer.width;
 126    float fb_height = svga->curr.framebuffer.height;
 127
 128    float fx =        viewport->scale[0] * -1.0 + viewport->translate[0];
 129    float fy = flip * viewport->scale[1] * -1.0 + viewport->translate[1];
 130    float fw =        viewport->scale[0] * 2;
 131    float fh = flip * viewport->scale[1] * 2;
 132
 133    memset( &prescale, 0, sizeof(prescale) );
 134
 135    /* Examine gallium viewport transformation and produce a screen
 136     * rectangle and possibly vertex shader pre-transformation to
 137     * get the same results.
 138     */
 139
 140    SVGA_DBG(DEBUG_VIEWPORT,
 141             "\ninitial %f,%f %fx%f\n",
 142             fx,
 143             fy,
 144             fw,
 145             fh);
 146
 147    prescale.scale[0] = 1.0;
 148    prescale.scale[1] = 1.0;
 149    prescale.scale[2] = 1.0;
 150    prescale.scale[3] = 1.0;
 151    prescale.translate[0] = 0;
 152    prescale.translate[1] = 0;
 153    prescale.translate[2] = 0;
 154    prescale.translate[3] = 0;
 155    prescale.enabled = TRUE;
 156
 157
 158
 159    if (fw < 0) {
 160       prescale.scale[0] *= -1.0;
 161       prescale.translate[0] += -fw;
 162       fw = -fw;
 163       fx =        viewport->scale[0] * 1.0 + viewport->translate[0];
 164    }
 165
 166    if (fh < 0) {
 167       prescale.scale[1] *= -1.0;
 168       prescale.translate[1] += -fh;
 169       fh = -fh;
 170       fy = flip * viewport->scale[1] * 1.0 + viewport->translate[1];
 171    }
 172
 173    if (fx < 0) {
 174       prescale.translate[0] += fx;
 175       prescale.scale[0] *= fw / (fw + fx);
 176       fw += fx;
 177       fx = 0;
 178    }
 179
 180    if (fy < 0) {
 181       prescale.translate[1] += fy;
 182       prescale.scale[1] *= fh / (fh + fy);
 183       fh += fy;
 184       fy = 0;
 185    }
 186
 187    if (fx + fw > fb_width) {
 188       prescale.scale[0] *= fw / (fb_width - fx);
 189       prescale.translate[0] -= fx * (fw / (fb_width - fx));
 190       prescale.translate[0] += fx;
 191       fw = fb_width - fx;
 192
 193    }
 194
 195    if (fy + fh > fb_height) {
 196       prescale.scale[1] *= fh / (fb_height - fy);
 197       prescale.translate[1] -= fy * (fh / (fb_height - fy));
 198       prescale.translate[1] += fy;
 199       fh = fb_height - fy;
 200    }
 201
 202    if (fw < 0 || fh < 0) {
 203       fw = fh = fx = fy = 0;
 204       degenerate = TRUE;
 205       goto out;
 206    }
 207
 208
 209    /* D3D viewport is integer space.  Convert fx,fy,etc. to
 210     * integers.
 211     *
 212     * TODO: adjust pretranslate correct for any subpixel error
 213     * introduced converting to integers.
 214     */
 215    rect.x = fx;
 216    rect.y = fy;
 217    rect.w = fw;
 218    rect.h = fh;
 219
 220    SVGA_DBG(DEBUG_VIEWPORT,
 221             "viewport error %f,%f %fx%f\n",
 222             fabs((float)rect.x - fx),
 223             fabs((float)rect.y - fy),
 224             fabs((float)rect.w - fw),
 225             fabs((float)rect.h - fh));
 226
 227    SVGA_DBG(DEBUG_VIEWPORT,
 228             "viewport %d,%d %dx%d\n",
 229             rect.x,
 230             rect.y,
 231             rect.w,
 232             rect.h);
 233
 234
 235    /* Finally, to get GL rasterization rules, need to tweak the
 236     * screen-space coordinates slightly relative to D3D which is
 237     * what hardware implements natively.
 238     */
 239    if (svga->curr.rast->templ.gl_rasterization_rules) {
 240       float adjust_x = 0.0;
 241       float adjust_y = 0.0;
 242
 243       switch (svga->curr.reduced_prim) {
 244       case PIPE_PRIM_LINES:
 245          adjust_x = -0.5;
 246          adjust_y = 0;
 247          break;
 248       case PIPE_PRIM_POINTS:
 249       case PIPE_PRIM_TRIANGLES:
 250          adjust_x = -0.375;
 251          adjust_y = -0.5;
 252          break;
 253       }
 254
 255       prescale.translate[0] += adjust_x;
 256       prescale.translate[1] += adjust_y;
 257       prescale.translate[2] = 0.5; /* D3D clip space */
 258       prescale.scale[2]     = 0.5; /* D3D clip space */
 259    }
 260
 261
 262    range_min = viewport->scale[2] * -1.0 + viewport->translate[2];
 263    range_max = viewport->scale[2] *  1.0 + viewport->translate[2];
 264
 265    /* D3D (and by implication SVGA) doesn't like dealing with zmax
 266     * less than zmin.  Detect that case, flip the depth range and
 267     * invert our z-scale factor to achieve the same effect.
 268     */
 269    if (range_min > range_max) {
 270       float range_tmp;
 271       range_tmp = range_min;
 272       range_min = range_max;
 273       range_max = range_tmp;
 274       prescale.scale[2]     = -prescale.scale[2];
 275    }
 276
 277    if (prescale.enabled) {
 278       float H[2];
 279       float J[2];
 280       int i;
 281
 282       SVGA_DBG(DEBUG_VIEWPORT,
 283                "prescale %f,%f %fx%f\n",
 284                prescale.translate[0],
 285                prescale.translate[1],
 286                prescale.scale[0],
 287                prescale.scale[1]);
 288
 289       H[0] = (float)rect.w / 2.0;
 290       H[1] = -(float)rect.h / 2.0;
 291       J[0] = (float)rect.x + (float)rect.w / 2.0;
 292       J[1] = (float)rect.y + (float)rect.h / 2.0;
 293
 294       SVGA_DBG(DEBUG_VIEWPORT,
 295                "H %f,%f\n"
 296                "J %fx%f\n",
 297                H[0],
 298                H[1],
 299                J[0],
 300                J[1]);
 301
 302       /* Adjust prescale to take into account the fact that it is
 303        * going to be applied prior to the perspective divide and
 304        * viewport transformation.
 305        *
 306        * Vwin = H(Vc/Vc.w) + J
 307        *
 308        * We want to tweak Vwin with scale and translation from above,
 309        * as in:
 310        *
 311        * Vwin' = S Vwin + T
 312        *
 313        * But we can only modify the values at Vc.  Plugging all the
 314        * above together, and rearranging, eventually we get:
 315        *
 316        *   Vwin' = H(Vc'/Vc'.w) + J
 317        * where:
 318        *   Vc' = SVc + KVc.w
 319        *   K = (T + (S-1)J) / H
 320        *
 321        * Overwrite prescale.translate with values for K:
 322        */
 323       for (i = 0; i < 2; i++) {
 324          prescale.translate[i] = ((prescale.translate[i] +
 325                                    (prescale.scale[i] - 1.0) * J[i]) / H[i]);
 326       }
 327
 328       SVGA_DBG(DEBUG_VIEWPORT,
 329                "clipspace %f,%f %fx%f\n",
 330                prescale.translate[0],
 331                prescale.translate[1],
 332                prescale.scale[0],
 333                prescale.scale[1]);
 334    }
 335
 336 out:
 337    if (degenerate) {
 338       rect.x = 0;
 339       rect.y = 0;
 340       rect.w = 1;
 341       rect.h = 1;
 342       prescale.enabled = FALSE;
 343    }
 344
 345    if (memcmp(&rect, &svga->state.hw_clear.viewport, sizeof(rect)) != 0) {
 346       ret = SVGA3D_SetViewport(svga->swc, &rect);
 347       if(ret != PIPE_OK)
 348          return ret;
 349
 350       memcpy(&svga->state.hw_clear.viewport, &rect, sizeof(rect));
 351       assert(sizeof(rect) == sizeof(svga->state.hw_clear.viewport));
 352    }
 353
 354    if (svga->state.hw_clear.depthrange.zmin != range_min ||
 355        svga->state.hw_clear.depthrange.zmax != range_max)
 356    {
 357       ret = SVGA3D_SetZRange(svga->swc, range_min, range_max );
 358       if(ret != PIPE_OK)
 359          return ret;
 360
 361       svga->state.hw_clear.depthrange.zmin = range_min;
 362       svga->state.hw_clear.depthrange.zmax = range_max;
 363    }
 364
 365    if (memcmp(&prescale, &svga->state.hw_clear.prescale, sizeof prescale) != 0) {
 366       svga->dirty |= SVGA_NEW_PRESCALE;
 367       svga->state.hw_clear.prescale = prescale;
 368    }
 369
 370    return 0;
 371 }
 372
 373
 374 struct svga_tracked_state svga_hw_viewport =
 375 {
 376    "hw viewport state",
 377    ( SVGA_NEW_FRAME_BUFFER |
 378      SVGA_NEW_VIEWPORT |
 379      SVGA_NEW_RAST |
 380      SVGA_NEW_REDUCED_PRIMITIVE ),
 381    emit_viewport
 382 };
 383
 384
 385 /***********************************************************************
 386  * Scissor state
 387  */
 388 static int emit_scissor_rect( struct svga_context *svga,
 389                               unsigned dirty )
 390 {
 391    const struct pipe_scissor_state *scissor = &svga->curr.scissor;
 392    SVGA3dRect rect;
 393
 394    rect.x = scissor->minx;
 395    rect.y = scissor->miny;
 396    rect.w = scissor->maxx - scissor->minx; /* + 1 ?? */
 397    rect.h = scissor->maxy - scissor->miny; /* + 1 ?? */
 398
 399    return SVGA3D_SetScissorRect(svga->swc, &rect);
 400 }
 401
 402
 403 struct svga_tracked_state svga_hw_scissor =
 404 {
 405    "hw scissor state",
 406    SVGA_NEW_SCISSOR,
 407    emit_scissor_rect
 408 };
 409
 410
 411 /***********************************************************************
 412  * Userclip state
 413  */
 414
 415 static int emit_clip_planes( struct svga_context *svga,
 416                              unsigned dirty )
 417 {
 418    unsigned i;
 419    enum pipe_error ret;
 420
 421    /* TODO: just emit directly from svga_set_clip_state()?
 422     */
 423    for (i = 0; i < svga->curr.clip.nr; i++) {
 424       ret = SVGA3D_SetClipPlane( svga->swc,
 425                                  i,
 426                                  svga->curr.clip.ucp[i] );
 427       if(ret != PIPE_OK)
 428          return ret;
 429    }
 430
 431    return 0;
 432 }
 433
 434
 435 struct svga_tracked_state svga_hw_clip_planes =
 436 {
 437    "hw viewport state",
 438    SVGA_NEW_CLIP,
 439    emit_clip_planes
 440 };