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    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_S8_USCALED_Z24_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    float fx =        viewport->scale[0] * -1.0 + viewport->translate[0];
 124    float fy = flip * viewport->scale[1] * -1.0 + viewport->translate[1];
 125    float fw =        viewport->scale[0] * 2;
 126    float fh = flip * viewport->scale[1] * 2;
 127
 128    memset( &prescale, 0, sizeof(prescale) );
 129
 130    /* Examine gallium viewport transformation and produce a screen
 131     * rectangle and possibly vertex shader pre-transformation to
 132     * get the same results.
 133     */
 134
 135    SVGA_DBG(DEBUG_VIEWPORT,
 136             "\ninitial %f,%f %fx%f\n",
 137             fx,
 138             fy,
 139             fw,
 140             fh);
 141
 142    prescale.scale[0] = 1.0;
 143    prescale.scale[1] = 1.0;
 144    prescale.scale[2] = 1.0;
 145    prescale.scale[3] = 1.0;
 146    prescale.translate[0] = 0;
 147    prescale.translate[1] = 0;
 148    prescale.translate[2] = 0;
 149    prescale.translate[3] = 0;
 150    prescale.enabled = TRUE;
 151
 152
 153
 154    if (fw < 0) {
 155       prescale.scale[0] *= -1.0;
 156       prescale.translate[0] += -fw;
 157       fw = -fw;
 158       fx =        viewport->scale[0] * 1.0 + viewport->translate[0];
 159    }
 160
 161    if (fh < 0) {
 162       prescale.scale[1] *= -1.0;
 163       prescale.translate[1] += -fh;
 164       fh = -fh;
 165       fy = flip * viewport->scale[1] * 1.0 + viewport->translate[1];
 166    }
 167
 168    if (fx < 0) {
 169       prescale.translate[0] += fx;
 170       prescale.scale[0] *= fw / (fw + fx);
 171       fw += fx;
 172       fx = 0;
 173    }
 174
 175    if (fy < 0) {
 176       prescale.translate[1] += fy;
 177       prescale.scale[1] *= fh / (fh + fy);
 178       fh += fy;
 179       fy = 0;
 180    }
 181
 182    if (fx + fw > fb_width) {
 183       prescale.scale[0] *= fw / (fb_width - fx);
 184       prescale.translate[0] -= fx * (fw / (fb_width - fx));
 185       prescale.translate[0] += fx;
 186       fw = fb_width - fx;
 187
 188    }
 189
 190    if (fy + fh > fb_height) {
 191       prescale.scale[1] *= fh / (fb_height - fy);
 192       prescale.translate[1] -= fy * (fh / (fb_height - fy));
 193       prescale.translate[1] += fy;
 194       fh = fb_height - fy;
 195    }
 196
 197    if (fw < 0 || fh < 0) {
 198       fw = fh = fx = fy = 0;
 199       degenerate = TRUE;
 200       goto out;
 201    }
 202
 203
 204    /* D3D viewport is integer space.  Convert fx,fy,etc. to
 205     * integers.
 206     *
 207     * TODO: adjust pretranslate correct for any subpixel error
 208     * introduced converting to integers.
 209     */
 210    rect.x = fx;
 211    rect.y = fy;
 212    rect.w = fw;
 213    rect.h = fh;
 214
 215    SVGA_DBG(DEBUG_VIEWPORT,
 216             "viewport error %f,%f %fx%f\n",
 217             fabs((float)rect.x - fx),
 218             fabs((float)rect.y - fy),
 219             fabs((float)rect.w - fw),
 220             fabs((float)rect.h - fh));
 221
 222    SVGA_DBG(DEBUG_VIEWPORT,
 223             "viewport %d,%d %dx%d\n",
 224             rect.x,
 225             rect.y,
 226             rect.w,
 227             rect.h);
 228
 229
 230    /* Finally, to get GL rasterization rules, need to tweak the
 231     * screen-space coordinates slightly relative to D3D which is
 232     * what hardware implements natively.
 233     */
 234    if (svga->curr.rast->templ.gl_rasterization_rules) {
 235       float adjust_x = 0.0;
 236       float adjust_y = 0.0;
 237
 238       switch (svga->curr.reduced_prim) {
 239       case PIPE_PRIM_LINES:
 240          adjust_x = -0.5;
 241          adjust_y = 0;
 242          break;
 243       case PIPE_PRIM_POINTS:
 244       case PIPE_PRIM_TRIANGLES:
 245          adjust_x = -0.375;
 246          adjust_y = -0.5;
 247          break;
 248       }
 249
 250       prescale.translate[0] += adjust_x;
 251       prescale.translate[1] += adjust_y;
 252       prescale.translate[2] = 0.5; /* D3D clip space */
 253       prescale.scale[2]     = 0.5; /* D3D clip space */
 254    }
 255
 256
 257    range_min = viewport->scale[2] * -1.0 + viewport->translate[2];
 258    range_max = viewport->scale[2] *  1.0 + viewport->translate[2];
 259
 260    /* D3D (and by implication SVGA) doesn't like dealing with zmax
 261     * less than zmin.  Detect that case, flip the depth range and
 262     * invert our z-scale factor to achieve the same effect.
 263     */
 264    if (range_min > range_max) {
 265       float range_tmp;
 266       range_tmp = range_min;
 267       range_min = range_max;
 268       range_max = range_tmp;
 269       prescale.scale[2]     = -prescale.scale[2];
 270    }
 271
 272    if (prescale.enabled) {
 273       float H[2];
 274       float J[2];
 275       int i;
 276
 277       SVGA_DBG(DEBUG_VIEWPORT,
 278                "prescale %f,%f %fx%f\n",
 279                prescale.translate[0],
 280                prescale.translate[1],
 281                prescale.scale[0],
 282                prescale.scale[1]);
 283
 284       H[0] = (float)rect.w / 2.0;
 285       H[1] = -(float)rect.h / 2.0;
 286       J[0] = (float)rect.x + (float)rect.w / 2.0;
 287       J[1] = (float)rect.y + (float)rect.h / 2.0;
 288
 289       SVGA_DBG(DEBUG_VIEWPORT,
 290                "H %f,%f\n"
 291                "J %fx%f\n",
 292                H[0],
 293                H[1],
 294                J[0],
 295                J[1]);
 296
 297       /* Adjust prescale to take into account the fact that it is
 298        * going to be applied prior to the perspective divide and
 299        * viewport transformation.
 300        *
 301        * Vwin = H(Vc/Vc.w) + J
 302        *
 303        * We want to tweak Vwin with scale and translation from above,
 304        * as in:
 305        *
 306        * Vwin' = S Vwin + T
 307        *
 308        * But we can only modify the values at Vc.  Plugging all the
 309        * above together, and rearranging, eventually we get:
 310        *
 311        *   Vwin' = H(Vc'/Vc'.w) + J
 312        * where:
 313        *   Vc' = SVc + KVc.w
 314        *   K = (T + (S-1)J) / H
 315        *
 316        * Overwrite prescale.translate with values for K:
 317        */
 318       for (i = 0; i < 2; i++) {
 319          prescale.translate[i] = ((prescale.translate[i] +
 320                                    (prescale.scale[i] - 1.0) * J[i]) / H[i]);
 321       }
 322
 323       SVGA_DBG(DEBUG_VIEWPORT,
 324                "clipspace %f,%f %fx%f\n",
 325                prescale.translate[0],
 326                prescale.translate[1],
 327                prescale.scale[0],
 328                prescale.scale[1]);
 329    }
 330
 331 out:
 332    if (degenerate) {
 333       rect.x = 0;
 334       rect.y = 0;
 335       rect.w = 1;
 336       rect.h = 1;
 337       prescale.enabled = FALSE;
 338    }
 339
 340    if (memcmp(&rect, &svga->state.hw_clear.viewport, sizeof(rect)) != 0) {
 341       ret = SVGA3D_SetViewport(svga->swc, &rect);
 342       if(ret != PIPE_OK)
 343          return ret;
 344
 345       memcpy(&svga->state.hw_clear.viewport, &rect, sizeof(rect));
 346       assert(sizeof(rect) == sizeof(svga->state.hw_clear.viewport));
 347    }
 348
 349    if (svga->state.hw_clear.depthrange.zmin != range_min ||
 350        svga->state.hw_clear.depthrange.zmax != range_max)
 351    {
 352       ret = SVGA3D_SetZRange(svga->swc, range_min, range_max );
 353       if(ret != PIPE_OK)
 354          return ret;
 355
 356       svga->state.hw_clear.depthrange.zmin = range_min;
 357       svga->state.hw_clear.depthrange.zmax = range_max;
 358    }
 359
 360    if (memcmp(&prescale, &svga->state.hw_clear.prescale, sizeof prescale) != 0) {
 361       svga->dirty |= SVGA_NEW_PRESCALE;
 362       svga->state.hw_clear.prescale = prescale;
 363    }
 364
 365    return 0;
 366 }
 367
 368
 369 struct svga_tracked_state svga_hw_viewport =
 370 {
 371    "hw viewport state",
 372    ( SVGA_NEW_FRAME_BUFFER |
 373      SVGA_NEW_VIEWPORT |
 374      SVGA_NEW_RAST |
 375      SVGA_NEW_REDUCED_PRIMITIVE ),
 376    emit_viewport
 377 };
 378
 379
 380 /***********************************************************************
 381  * Scissor state
 382  */
 383 static int emit_scissor_rect( struct svga_context *svga,
 384                               unsigned dirty )
 385 {
 386    const struct pipe_scissor_state *scissor = &svga->curr.scissor;
 387    SVGA3dRect rect;
 388
 389    rect.x = scissor->minx;
 390    rect.y = scissor->miny;
 391    rect.w = scissor->maxx - scissor->minx; /* + 1 ?? */
 392    rect.h = scissor->maxy - scissor->miny; /* + 1 ?? */
 393
 394    return SVGA3D_SetScissorRect(svga->swc, &rect);
 395 }
 396
 397
 398 struct svga_tracked_state svga_hw_scissor =
 399 {
 400    "hw scissor state",
 401    SVGA_NEW_SCISSOR,
 402    emit_scissor_rect
 403 };
 404
 405
 406 /***********************************************************************
 407  * Userclip state
 408  */
 409
 410 static int emit_clip_planes( struct svga_context *svga,
 411                              unsigned dirty )
 412 {
 413    unsigned i;
 414    enum pipe_error ret;
 415
 416    /* TODO: just emit directly from svga_set_clip_state()?
 417     */
 418    for (i = 0; i < svga->curr.clip.nr; i++) {
 419       ret = SVGA3D_SetClipPlane( svga->swc,
 420                                  i,
 421                                  svga->curr.clip.ucp[i] );
 422       if(ret != PIPE_OK)
 423          return ret;
 424    }
 425
 426    return 0;
 427 }
 428
 429
 430 struct svga_tracked_state svga_hw_clip_planes =
 431 {
 432    "hw viewport state",
 433    SVGA_NEW_CLIP,
 434    emit_clip_planes
 435 };