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