src/mesa/main/viewport.c

   1 /*
   2  * Mesa 3-D graphics library
   3  *
   4  * Copyright (C) 2009  VMware, Inc.  All Rights Reserved.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * copy of this software and associated documentation files (the "Software"),
   8  * to deal in the Software without restriction, including without limitation
   9  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  10  * and/or sell copies of the Software, and to permit persons to whom the
  11  * Software is furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included
  14  * in all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  17  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
  20  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  21  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  22  * OTHER DEALINGS IN THE SOFTWARE.
  23  */
  24
  25
  26 /**
  27  * \file viewport.c
  28  * glViewport and glDepthRange functions.
  29  */
  30
  31
  32 #include "context.h"
  33 #include "enums.h"
  34 #include "macros.h"
  35 #include "mtypes.h"
  36 #include "viewport.h"
  37
  38 static void
  39 clamp_viewport(struct gl_context *ctx, GLfloat *x, GLfloat *y,
  40                GLfloat *width, GLfloat *height)
  41 {
  42    /* clamp width and height to the implementation dependent range */
  43    *width  = MIN2(*width, (GLfloat) ctx->Const.MaxViewportWidth);
  44    *height = MIN2(*height, (GLfloat) ctx->Const.MaxViewportHeight);
  45
  46    /* The GL_ARB_viewport_array spec says:
  47     *
  48     *     "The location of the viewport's bottom-left corner, given by (x,y),
  49     *     are clamped to be within the implementation-dependent viewport
  50     *     bounds range.  The viewport bounds range [min, max] tuple may be
  51     *     determined by calling GetFloatv with the symbolic constant
  52     *     VIEWPORT_BOUNDS_RANGE (see section 6.1)."
  53     */
  54    if (_mesa_has_ARB_viewport_array(ctx) ||
  55        _mesa_has_OES_viewport_array(ctx)) {
  56       *x = CLAMP(*x,
  57                  ctx->Const.ViewportBounds.Min, ctx->Const.ViewportBounds.Max);
  58       *y = CLAMP(*y,
  59                  ctx->Const.ViewportBounds.Min, ctx->Const.ViewportBounds.Max);
  60    }
  61 }
  62
  63 static void
  64 set_viewport_no_notify(struct gl_context *ctx, unsigned idx,
  65                        GLfloat x, GLfloat y,
  66                        GLfloat width, GLfloat height)
  67 {
  68    if (ctx->ViewportArray[idx].X == x &&
  69        ctx->ViewportArray[idx].Width == width &&
  70        ctx->ViewportArray[idx].Y == y &&
  71        ctx->ViewportArray[idx].Height == height)
  72       return;
  73
  74    FLUSH_VERTICES(ctx, ctx->DriverFlags.NewViewport ? 0 : _NEW_VIEWPORT);
  75    ctx->NewDriverState |= ctx->DriverFlags.NewViewport;
  76
  77    ctx->ViewportArray[idx].X = x;
  78    ctx->ViewportArray[idx].Width = width;
  79    ctx->ViewportArray[idx].Y = y;
  80    ctx->ViewportArray[idx].Height = height;
  81 }
  82
  83 struct gl_viewport_inputs {
  84    GLfloat X, Y;                /**< position */
  85    GLfloat Width, Height;       /**< size */
  86 };
  87
  88 struct gl_depthrange_inputs {
  89    GLdouble Near, Far;          /**< Depth buffer range */
  90 };
  91
  92 static void
  93 viewport(struct gl_context *ctx, GLint x, GLint y, GLsizei width,
  94          GLsizei height)
  95 {
  96    struct gl_viewport_inputs input = { x, y, width, height };
  97
  98    /* Clamp the viewport to the implementation dependent values. */
  99    clamp_viewport(ctx, &input.X, &input.Y, &input.Width, &input.Height);
 100
 101    /* The GL_ARB_viewport_array spec says:
 102     *
 103     *     "Viewport sets the parameters for all viewports to the same values
 104     *     and is equivalent (assuming no errors are generated) to:
 105     *
 106     *     for (uint i = 0; i < MAX_VIEWPORTS; i++)
 107     *         ViewportIndexedf(i, 1, (float)x, (float)y, (float)w, (float)h);"
 108     *
 109     * Set all of the viewports supported by the implementation, but only
 110     * signal the driver once at the end.
 111     */
 112    for (unsigned i = 0; i < ctx->Const.MaxViewports; i++)
 113       set_viewport_no_notify(ctx, i, input.X, input.Y, input.Width, input.Height);
 114
 115    if (ctx->Driver.Viewport)
 116       ctx->Driver.Viewport(ctx);
 117 }
 118
 119 /**
 120  * Set the viewport.
 121  * \sa Called via glViewport() or display list execution.
 122  *
 123  * Flushes the vertices and calls _mesa_set_viewport() with the given
 124  * parameters.
 125  */
 126 void GLAPIENTRY
 127 _mesa_Viewport_no_error(GLint x, GLint y, GLsizei width, GLsizei height)
 128 {
 129    GET_CURRENT_CONTEXT(ctx);
 130    viewport(ctx, x, y, width, height);
 131 }
 132
 133 void GLAPIENTRY
 134 _mesa_Viewport(GLint x, GLint y, GLsizei width, GLsizei height)
 135 {
 136    GET_CURRENT_CONTEXT(ctx);
 137
 138    if (MESA_VERBOSE & VERBOSE_API)
 139       _mesa_debug(ctx, "glViewport %d %d %d %d\n", x, y, width, height);
 140
 141    if (width < 0 || height < 0) {
 142       _mesa_error(ctx,  GL_INVALID_VALUE,
 143                    "glViewport(%d, %d, %d, %d)", x, y, width, height);
 144       return;
 145    }
 146
 147    viewport(ctx, x, y, width, height);
 148 }
 149
 150
 151 /**
 152  * Set new viewport parameters and update derived state.
 153  * Usually called from _mesa_Viewport().
 154  *
 155  * \param ctx GL context.
 156  * \param idx    Index of the viewport to be updated.
 157  * \param x, y coordinates of the lower left corner of the viewport rectangle.
 158  * \param width width of the viewport rectangle.
 159  * \param height height of the viewport rectangle.
 160  */
 161 void
 162 _mesa_set_viewport(struct gl_context *ctx, unsigned idx, GLfloat x, GLfloat y,
 163                     GLfloat width, GLfloat height)
 164 {
 165    clamp_viewport(ctx, &x, &y, &width, &height);
 166    set_viewport_no_notify(ctx, idx, x, y, width, height);
 167
 168    if (ctx->Driver.Viewport)
 169       ctx->Driver.Viewport(ctx);
 170 }
 171
 172 static void
 173 viewport_array(struct gl_context *ctx, GLuint first, GLsizei count,
 174                struct gl_viewport_inputs *inputs)
 175 {
 176    for (GLsizei i = 0; i < count; i++) {
 177       clamp_viewport(ctx, &inputs[i].X, &inputs[i].Y,
 178                      &inputs[i].Width, &inputs[i].Height);
 179
 180       set_viewport_no_notify(ctx, i + first, inputs[i].X, inputs[i].Y,
 181                              inputs[i].Width, inputs[i].Height);
 182    }
 183
 184    if (ctx->Driver.Viewport)
 185       ctx->Driver.Viewport(ctx);
 186 }
 187
 188 void GLAPIENTRY
 189 _mesa_ViewportArrayv_no_error(GLuint first, GLsizei count, const GLfloat *v)
 190 {
 191    GET_CURRENT_CONTEXT(ctx);
 192
 193    struct gl_viewport_inputs *p = (struct gl_viewport_inputs *)v;
 194    viewport_array(ctx, first, count, p);
 195 }
 196
 197 void GLAPIENTRY
 198 _mesa_ViewportArrayv(GLuint first, GLsizei count, const GLfloat *v)
 199 {
 200    int i;
 201    struct gl_viewport_inputs *p = (struct gl_viewport_inputs *)v;
 202    GET_CURRENT_CONTEXT(ctx);
 203
 204    if (MESA_VERBOSE & VERBOSE_API)
 205       _mesa_debug(ctx, "glViewportArrayv %d %d\n", first, count);
 206
 207    if ((first + count) > ctx->Const.MaxViewports) {
 208       _mesa_error(ctx, GL_INVALID_VALUE,
 209                   "glViewportArrayv: first (%d) + count (%d) > MaxViewports "
 210                   "(%d)",
 211                   first, count, ctx->Const.MaxViewports);
 212       return;
 213    }
 214
 215    /* Verify width & height */
 216    for (i = 0; i < count; i++) {
 217       if (p[i].Width < 0 || p[i].Height < 0) {
 218          _mesa_error(ctx, GL_INVALID_VALUE,
 219                      "glViewportArrayv: index (%d) width or height < 0 "
 220                      "(%f, %f)",
 221                      i + first, p[i].Width, p[i].Height);
 222          return;
 223       }
 224    }
 225
 226    viewport_array(ctx, first, count, p);
 227 }
 228
 229 static void
 230 viewport_indexed_err(struct gl_context *ctx, GLuint index, GLfloat x, GLfloat y,
 231                      GLfloat w, GLfloat h, const char *function)
 232 {
 233    if (MESA_VERBOSE & VERBOSE_API)
 234       _mesa_debug(ctx, "%s(%d, %f, %f, %f, %f)\n",
 235                   function, index, x, y, w, h);
 236
 237    if (index >= ctx->Const.MaxViewports) {
 238       _mesa_error(ctx, GL_INVALID_VALUE,
 239                   "%s: index (%d) >= MaxViewports (%d)",
 240                   function, index, ctx->Const.MaxViewports);
 241       return;
 242    }
 243
 244    /* Verify width & height */
 245    if (w < 0 || h < 0) {
 246       _mesa_error(ctx, GL_INVALID_VALUE,
 247                   "%s: index (%d) width or height < 0 (%f, %f)",
 248                   function, index, w, h);
 249       return;
 250    }
 251
 252    _mesa_set_viewport(ctx, index, x, y, w, h);
 253 }
 254
 255 void GLAPIENTRY
 256 _mesa_ViewportIndexedf_no_error(GLuint index, GLfloat x, GLfloat y,
 257                                 GLfloat w, GLfloat h)
 258 {
 259    GET_CURRENT_CONTEXT(ctx);
 260    _mesa_set_viewport(ctx, index, x, y, w, h);
 261 }
 262
 263 void GLAPIENTRY
 264 _mesa_ViewportIndexedf(GLuint index, GLfloat x, GLfloat y,
 265                        GLfloat w, GLfloat h)
 266 {
 267    GET_CURRENT_CONTEXT(ctx);
 268    viewport_indexed_err(ctx, index, x, y, w, h, "glViewportIndexedf");
 269 }
 270
 271 void GLAPIENTRY
 272 _mesa_ViewportIndexedfv_no_error(GLuint index, const GLfloat *v)
 273 {
 274    GET_CURRENT_CONTEXT(ctx);
 275    _mesa_set_viewport(ctx, index, v[0], v[1], v[2], v[3]);
 276 }
 277
 278 void GLAPIENTRY
 279 _mesa_ViewportIndexedfv(GLuint index, const GLfloat *v)
 280 {
 281    GET_CURRENT_CONTEXT(ctx);
 282    viewport_indexed_err(ctx, index, v[0], v[1], v[2], v[3],
 283                         "glViewportIndexedfv");
 284 }
 285
 286 static void
 287 set_depth_range_no_notify(struct gl_context *ctx, unsigned idx,
 288                           GLclampd nearval, GLclampd farval)
 289 {
 290    if (ctx->ViewportArray[idx].Near == nearval &&
 291        ctx->ViewportArray[idx].Far == farval)
 292       return;
 293
 294    /* The depth range is needed by program state constants. */
 295    FLUSH_VERTICES(ctx, _NEW_VIEWPORT);
 296    ctx->NewDriverState |= ctx->DriverFlags.NewViewport;
 297
 298    ctx->ViewportArray[idx].Near = SATURATE(nearval);
 299    ctx->ViewportArray[idx].Far = SATURATE(farval);
 300 }
 301
 302 void
 303 _mesa_set_depth_range(struct gl_context *ctx, unsigned idx,
 304                       GLclampd nearval, GLclampd farval)
 305 {
 306    set_depth_range_no_notify(ctx, idx, nearval, farval);
 307
 308    if (ctx->Driver.DepthRange)
 309       ctx->Driver.DepthRange(ctx);
 310 }
 311
 312 /**
 313  * Called by glDepthRange
 314  *
 315  * \param nearval  specifies the Z buffer value which should correspond to
 316  *                 the near clip plane
 317  * \param farval  specifies the Z buffer value which should correspond to
 318  *                the far clip plane
 319  */
 320 void GLAPIENTRY
 321 _mesa_DepthRange(GLclampd nearval, GLclampd farval)
 322 {
 323    unsigned i;
 324    GET_CURRENT_CONTEXT(ctx);
 325
 326    if (MESA_VERBOSE&VERBOSE_API)
 327       _mesa_debug(ctx, "glDepthRange %f %f\n", nearval, farval);
 328
 329    /* The GL_ARB_viewport_array spec says:
 330     *
 331     *     "DepthRange sets the depth range for all viewports to the same
 332     *     values and is equivalent (assuming no errors are generated) to:
 333     *
 334     *     for (uint i = 0; i < MAX_VIEWPORTS; i++)
 335     *         DepthRangeIndexed(i, n, f);"
 336     *
 337     * Set the depth range for all of the viewports supported by the
 338     * implementation, but only signal the driver once at the end.
 339     */
 340    for (i = 0; i < ctx->Const.MaxViewports; i++)
 341       set_depth_range_no_notify(ctx, i, nearval, farval);
 342
 343    if (ctx->Driver.DepthRange) {
 344       ctx->Driver.DepthRange(ctx);
 345    }
 346 }
 347
 348 void GLAPIENTRY
 349 _mesa_DepthRangef(GLclampf nearval, GLclampf farval)
 350 {
 351    _mesa_DepthRange(nearval, farval);
 352 }
 353
 354 /**
 355  * Update a range DepthRange values
 356  *
 357  * \param first   starting array index
 358  * \param count   count of DepthRange items to update
 359  * \param v       pointer to memory containing
 360  *                GLclampd near and far clip-plane values
 361  */
 362 static ALWAYS_INLINE void
 363 depth_range_arrayv(struct gl_context *ctx, GLuint first, GLsizei count,
 364                    const struct gl_depthrange_inputs *const inputs)
 365 {
 366    for (GLsizei i = 0; i < count; i++)
 367       set_depth_range_no_notify(ctx, i + first, inputs[i].Near, inputs[i].Far);
 368
 369    if (ctx->Driver.DepthRange)
 370       ctx->Driver.DepthRange(ctx);
 371 }
 372
 373 void GLAPIENTRY
 374 _mesa_DepthRangeArrayv_no_error(GLuint first, GLsizei count, const GLclampd *v)
 375 {
 376    GET_CURRENT_CONTEXT(ctx);
 377
 378    const struct gl_depthrange_inputs *const p =
 379       (struct gl_depthrange_inputs *)v;
 380    depth_range_arrayv(ctx, first, count, p);
 381 }
 382
 383 void GLAPIENTRY
 384 _mesa_DepthRangeArrayv(GLuint first, GLsizei count, const GLclampd *v)
 385 {
 386    const struct gl_depthrange_inputs *const p =
 387       (struct gl_depthrange_inputs *) v;
 388    GET_CURRENT_CONTEXT(ctx);
 389
 390    if (MESA_VERBOSE & VERBOSE_API)
 391       _mesa_debug(ctx, "glDepthRangeArrayv %d %d\n", first, count);
 392
 393    if ((first + count) > ctx->Const.MaxViewports) {
 394       _mesa_error(ctx, GL_INVALID_VALUE,
 395                   "glDepthRangev: first (%d) + count (%d) >= MaxViewports (%d)",
 396                   first, count, ctx->Const.MaxViewports);
 397       return;
 398    }
 399
 400    depth_range_arrayv(ctx, first, count, p);
 401 }
 402
 403 void GLAPIENTRY
 404 _mesa_DepthRangeArrayfvOES(GLuint first, GLsizei count, const GLfloat *v)
 405 {
 406    int i;
 407    GET_CURRENT_CONTEXT(ctx);
 408
 409    if (MESA_VERBOSE & VERBOSE_API)
 410       _mesa_debug(ctx, "glDepthRangeArrayfv %d %d\n", first, count);
 411
 412    if ((first + count) > ctx->Const.MaxViewports) {
 413       _mesa_error(ctx, GL_INVALID_VALUE,
 414                   "glDepthRangeArrayfv: first (%d) + count (%d) >= MaxViewports (%d)",
 415                   first, count, ctx->Const.MaxViewports);
 416       return;
 417    }
 418
 419    for (i = 0; i < count; i++)
 420       set_depth_range_no_notify(ctx, i + first, v[i * 2], v[i * 2 + 1]);
 421
 422    if (ctx->Driver.DepthRange)
 423       ctx->Driver.DepthRange(ctx);
 424 }
 425
 426 /**
 427  * Update a single DepthRange
 428  *
 429  * \param index    array index to update
 430  * \param nearval  specifies the Z buffer value which should correspond to
 431  *                 the near clip plane
 432  * \param farval   specifies the Z buffer value which should correspond to
 433  *                 the far clip plane
 434  */
 435 void GLAPIENTRY
 436 _mesa_DepthRangeIndexed_no_error(GLuint index, GLclampd nearval,
 437                                  GLclampd farval)
 438 {
 439    GET_CURRENT_CONTEXT(ctx);
 440    _mesa_set_depth_range(ctx, index, nearval, farval);
 441 }
 442
 443
 444 void GLAPIENTRY
 445 _mesa_DepthRangeIndexed(GLuint index, GLclampd nearval, GLclampd farval)
 446 {
 447    GET_CURRENT_CONTEXT(ctx);
 448
 449    if (MESA_VERBOSE & VERBOSE_API)
 450       _mesa_debug(ctx, "glDepthRangeIndexed(%d, %f, %f)\n",
 451                   index, nearval, farval);
 452
 453    if (index >= ctx->Const.MaxViewports) {
 454       _mesa_error(ctx, GL_INVALID_VALUE,
 455                   "glDepthRangeIndexed: index (%d) >= MaxViewports (%d)",
 456                   index, ctx->Const.MaxViewports);
 457       return;
 458    }
 459
 460    _mesa_set_depth_range(ctx, index, nearval, farval);
 461 }
 462
 463 void GLAPIENTRY
 464 _mesa_DepthRangeIndexedfOES(GLuint index, GLfloat nearval, GLfloat farval)
 465 {
 466    _mesa_DepthRangeIndexed(index, nearval, farval);
 467 }
 468
 469 /**
 470  * Initialize the context viewport attribute group.
 471  * \param ctx  the GL context.
 472  */
 473 void _mesa_init_viewport(struct gl_context *ctx)
 474 {
 475    unsigned i;
 476
 477    ctx->Transform.ClipOrigin = GL_LOWER_LEFT;
 478    ctx->Transform.ClipDepthMode = GL_NEGATIVE_ONE_TO_ONE;
 479
 480    /* Note: ctx->Const.MaxViewports may not have been set by the driver yet,
 481     * so just initialize all of them.
 482     */
 483    for (i = 0; i < MAX_VIEWPORTS; i++) {
 484       /* Viewport group */
 485       ctx->ViewportArray[i].X = 0;
 486       ctx->ViewportArray[i].Y = 0;
 487       ctx->ViewportArray[i].Width = 0;
 488       ctx->ViewportArray[i].Height = 0;
 489       ctx->ViewportArray[i].Near = 0.0;
 490       ctx->ViewportArray[i].Far = 1.0;
 491       ctx->ViewportArray[i].SwizzleX = GL_VIEWPORT_SWIZZLE_POSITIVE_X_NV;
 492       ctx->ViewportArray[i].SwizzleY = GL_VIEWPORT_SWIZZLE_POSITIVE_Y_NV;
 493       ctx->ViewportArray[i].SwizzleZ = GL_VIEWPORT_SWIZZLE_POSITIVE_Z_NV;
 494       ctx->ViewportArray[i].SwizzleW = GL_VIEWPORT_SWIZZLE_POSITIVE_W_NV;
 495    }
 496
 497    ctx->SubpixelPrecisionBias[0] = 0;
 498    ctx->SubpixelPrecisionBias[1] = 0;
 499 }
 500
 501
 502 static ALWAYS_INLINE void
 503 clip_control(struct gl_context *ctx, GLenum origin, GLenum depth, bool no_error)
 504 {
 505    if (ctx->Transform.ClipOrigin == origin &&
 506        ctx->Transform.ClipDepthMode == depth)
 507       return;
 508
 509    if (!no_error &&
 510        origin != GL_LOWER_LEFT && origin != GL_UPPER_LEFT) {
 511       _mesa_error(ctx, GL_INVALID_ENUM, "glClipControl");
 512       return;
 513    }
 514
 515    if (!no_error &&
 516        depth != GL_NEGATIVE_ONE_TO_ONE && depth != GL_ZERO_TO_ONE) {
 517       _mesa_error(ctx, GL_INVALID_ENUM, "glClipControl");
 518       return;
 519    }
 520
 521    /* Affects transform state and the viewport transform */
 522    FLUSH_VERTICES(ctx, ctx->DriverFlags.NewClipControl ? 0 :
 523                   _NEW_TRANSFORM | _NEW_VIEWPORT);
 524    ctx->NewDriverState |= ctx->DriverFlags.NewClipControl;
 525
 526    if (ctx->Transform.ClipOrigin != origin) {
 527       ctx->Transform.ClipOrigin = origin;
 528
 529       /* Affects the winding order of the front face. */
 530       if (ctx->DriverFlags.NewPolygonState)
 531          ctx->NewDriverState |= ctx->DriverFlags.NewPolygonState;
 532       else
 533          ctx->NewState |= _NEW_POLYGON;
 534
 535       if (ctx->Driver.FrontFace)
 536          ctx->Driver.FrontFace(ctx, ctx->Polygon.FrontFace);
 537    }
 538
 539    if (ctx->Transform.ClipDepthMode != depth) {
 540       ctx->Transform.ClipDepthMode = depth;
 541
 542       if (ctx->Driver.DepthRange)
 543          ctx->Driver.DepthRange(ctx);
 544    }
 545 }
 546
 547
 548 void GLAPIENTRY
 549 _mesa_ClipControl_no_error(GLenum origin, GLenum depth)
 550 {
 551    GET_CURRENT_CONTEXT(ctx);
 552    clip_control(ctx, origin, depth, true);
 553 }
 554
 555
 556 void GLAPIENTRY
 557 _mesa_ClipControl(GLenum origin, GLenum depth)
 558 {
 559    GET_CURRENT_CONTEXT(ctx);
 560
 561    if (MESA_VERBOSE & VERBOSE_API)
 562       _mesa_debug(ctx, "glClipControl(%s, %s)\n",
 563                   _mesa_enum_to_string(origin),
 564                   _mesa_enum_to_string(depth));
 565
 566    ASSERT_OUTSIDE_BEGIN_END(ctx);
 567
 568    if (!ctx->Extensions.ARB_clip_control) {
 569       _mesa_error(ctx, GL_INVALID_OPERATION, "glClipControl");
 570       return;
 571    }
 572
 573    clip_control(ctx, origin, depth, false);
 574 }
 575
 576 /**
 577  * Computes the scaling and the translation part of the
 578  * viewport transform matrix of the \param i-th viewport
 579  * and writes that into \param scale and \param translate.
 580  */
 581 void
 582 _mesa_get_viewport_xform(struct gl_context *ctx, unsigned i,
 583                          float scale[3], float translate[3])
 584 {
 585    float x = ctx->ViewportArray[i].X;
 586    float y = ctx->ViewportArray[i].Y;
 587    float half_width = 0.5f * ctx->ViewportArray[i].Width;
 588    float half_height = 0.5f * ctx->ViewportArray[i].Height;
 589    double n = ctx->ViewportArray[i].Near;
 590    double f = ctx->ViewportArray[i].Far;
 591
 592    scale[0] = half_width;
 593    translate[0] = half_width + x;
 594    if (ctx->Transform.ClipOrigin == GL_UPPER_LEFT) {
 595       scale[1] = -half_height;
 596    } else {
 597       scale[1] = half_height;
 598    }
 599    translate[1] = half_height + y;
 600
 601    if (ctx->Transform.ClipDepthMode == GL_NEGATIVE_ONE_TO_ONE) {
 602       scale[2] = 0.5 * (f - n);
 603       translate[2] = 0.5 * (n + f);
 604    } else {
 605       scale[2] = f - n;
 606       translate[2] = n;
 607    }
 608 }
 609
 610
 611 static void
 612 subpixel_precision_bias(struct gl_context *ctx, GLuint xbits, GLuint ybits)
 613 {
 614    if (MESA_VERBOSE & VERBOSE_API)
 615       _mesa_debug(ctx, "glSubpixelPrecisionBiasNV(%u, %u)\n", xbits, ybits);
 616
 617    FLUSH_VERTICES(ctx, 0);
 618
 619    ctx->SubpixelPrecisionBias[0] = xbits;
 620    ctx->SubpixelPrecisionBias[1] = ybits;
 621
 622    ctx->NewDriverState |=
 623       ctx->DriverFlags.NewNvConservativeRasterizationParams;
 624 }
 625
 626 void GLAPIENTRY
 627 _mesa_SubpixelPrecisionBiasNV_no_error(GLuint xbits, GLuint ybits)
 628 {
 629    GET_CURRENT_CONTEXT(ctx);
 630
 631    if (MESA_VERBOSE & VERBOSE_API)
 632       _mesa_debug(ctx, "glSubpixelPrecisionBiasNV(%u, %u)\n", xbits, ybits);
 633
 634    subpixel_precision_bias(ctx, xbits, ybits);
 635 }
 636
 637 void GLAPIENTRY
 638 _mesa_SubpixelPrecisionBiasNV(GLuint xbits, GLuint ybits)
 639 {
 640    GET_CURRENT_CONTEXT(ctx);
 641
 642    if (MESA_VERBOSE & VERBOSE_API)
 643       _mesa_debug(ctx, "glSubpixelPrecisionBiasNV(%u, %u)\n", xbits, ybits);
 644
 645    ASSERT_OUTSIDE_BEGIN_END(ctx);
 646
 647    if (!ctx->Extensions.NV_conservative_raster) {
 648       _mesa_error(ctx, GL_INVALID_OPERATION,
 649                   "glSubpixelPrecisionBiasNV not supported");
 650       return;
 651    }
 652
 653    if (xbits > ctx->Const.MaxSubpixelPrecisionBiasBits) {
 654       _mesa_error(ctx, GL_INVALID_VALUE, "glSubpixelPrecisionBiasNV");
 655       return;
 656    }
 657
 658    if (ybits > ctx->Const.MaxSubpixelPrecisionBiasBits) {
 659       _mesa_error(ctx, GL_INVALID_VALUE, "glSubpixelPrecisionBiasNV");
 660       return;
 661    }
 662
 663    subpixel_precision_bias(ctx, xbits, ybits);
 664 }
 665
 666 static void
 667 set_viewport_swizzle(struct gl_context *ctx, GLuint index,
 668                      GLenum swizzlex, GLenum swizzley,
 669                      GLenum swizzlez, GLenum swizzlew)
 670 {
 671    struct gl_viewport_attrib *viewport = &ctx->ViewportArray[index];
 672    if (viewport->SwizzleX == swizzlex &&
 673        viewport->SwizzleY == swizzley &&
 674        viewport->SwizzleZ == swizzlez &&
 675        viewport->SwizzleW == swizzlew)
 676       return;
 677
 678    FLUSH_VERTICES(ctx, _NEW_VIEWPORT);
 679    ctx->NewDriverState |= ctx->DriverFlags.NewViewport;
 680
 681    viewport->SwizzleX = swizzlex;
 682    viewport->SwizzleY = swizzley;
 683    viewport->SwizzleZ = swizzlez;
 684    viewport->SwizzleW = swizzlew;
 685 }
 686
 687 void GLAPIENTRY
 688 _mesa_ViewportSwizzleNV_no_error(GLuint index,
 689                                  GLenum swizzlex, GLenum swizzley,
 690                                  GLenum swizzlez, GLenum swizzlew)
 691 {
 692    GET_CURRENT_CONTEXT(ctx);
 693
 694    if (MESA_VERBOSE & VERBOSE_API)
 695       _mesa_debug(ctx, "glViewportSwizzleNV(%x, %x, %x, %x)\n",
 696                   swizzlex, swizzley, swizzlez, swizzlew);
 697
 698    set_viewport_swizzle(ctx, index, swizzlex, swizzley, swizzlez, swizzlew);
 699 }
 700
 701 static bool
 702 verify_viewport_swizzle(GLenum swizzle)
 703 {
 704    return swizzle >= GL_VIEWPORT_SWIZZLE_POSITIVE_X_NV &&
 705       swizzle <= GL_VIEWPORT_SWIZZLE_NEGATIVE_W_NV;
 706 }
 707
 708 void GLAPIENTRY
 709 _mesa_ViewportSwizzleNV(GLuint index,
 710                         GLenum swizzlex, GLenum swizzley,
 711                         GLenum swizzlez, GLenum swizzlew)
 712 {
 713    GET_CURRENT_CONTEXT(ctx);
 714
 715    if (MESA_VERBOSE & VERBOSE_API)
 716       _mesa_debug(ctx, "glViewportSwizzleNV(%x, %x, %x, %x)\n",
 717                   swizzlex, swizzley, swizzlez, swizzlew);
 718
 719    if (!ctx->Extensions.NV_viewport_swizzle) {
 720       _mesa_error(ctx, GL_INVALID_OPERATION,
 721                   "glViewportSwizzleNV not supported");
 722       return;
 723    }
 724
 725    if (index >= ctx->Const.MaxViewports) {
 726       _mesa_error(ctx, GL_INVALID_VALUE,
 727                   "glViewportSwizzleNV: index (%d) >= MaxViewports (%d)",
 728                   index, ctx->Const.MaxViewports);
 729       return;
 730    }
 731
 732    if (!verify_viewport_swizzle(swizzlex)) {
 733       _mesa_error(ctx, GL_INVALID_ENUM,
 734                   "glViewportSwizzleNV(swizzlex=%x)", swizzlex);
 735       return;
 736    }
 737
 738    if (!verify_viewport_swizzle(swizzley)) {
 739       _mesa_error(ctx, GL_INVALID_ENUM,
 740                   "glViewportSwizzleNV(swizzley=%x)", swizzley);
 741       return;
 742    }
 743
 744    if (!verify_viewport_swizzle(swizzlez)) {
 745       _mesa_error(ctx, GL_INVALID_ENUM,
 746                   "glViewportSwizzleNV(swizzlez=%x)", swizzlez);
 747       return;
 748    }
 749
 750    if (!verify_viewport_swizzle(swizzlew)) {
 751       _mesa_error(ctx, GL_INVALID_ENUM,
 752                   "glViewportSwizzleNV(swizzlew=%x)", swizzlew);
 753       return;
 754    }
 755
 756    set_viewport_swizzle(ctx, index, swizzlex, swizzley, swizzlez, swizzlew);
 757 }