src/mesa/main/buffers.c

   1 /* $Id: buffers.c,v 1.42 2002/10/24 23:57:19 brianp Exp $ */
   2
   3 /*
   4  * Mesa 3-D graphics library
   5  * Version:  4.1
   6  *
   7  * Copyright (C) 1999-2002  Brian Paul   All Rights Reserved.
   8  *
   9  * Permission is hereby granted, free of charge, to any person obtaining a
  10  * copy of this software and associated documentation files (the "Software"),
  11  * to deal in the Software without restriction, including without limitation
  12  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  13  * and/or sell copies of the Software, and to permit persons to whom the
  14  * Software is furnished to do so, subject to the following conditions:
  15  *
  16  * The above copyright notice and this permission notice shall be included
  17  * in all copies or substantial portions of the Software.
  18  *
  19  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  20  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  21  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  22  * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  23  * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  24  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25  */
  26
  27
  28 #include "glheader.h"
  29 #include "imports.h"
  30 #include "accum.h"
  31 #include "buffers.h"
  32 #include "colormac.h"
  33 #include "context.h"
  34 #include "depth.h"
  35 #include "enums.h"
  36 #include "macros.h"
  37 #include "stencil.h"
  38 #include "state.h"
  39 #include "mtypes.h"
  40
  41
  42
  43 void
  44 _mesa_ClearIndex( GLfloat c )
  45 {
  46    GET_CURRENT_CONTEXT(ctx);
  47    ASSERT_OUTSIDE_BEGIN_END(ctx);
  48
  49    if (ctx->Color.ClearIndex == (GLuint) c)
  50       return;
  51
  52    FLUSH_VERTICES(ctx, _NEW_COLOR);
  53    ctx->Color.ClearIndex = (GLuint) c;
  54
  55    if (!ctx->Visual.rgbMode && ctx->Driver.ClearIndex) {
  56       /* it's OK to call glClearIndex in RGBA mode but it should be a NOP */
  57       (*ctx->Driver.ClearIndex)( ctx, ctx->Color.ClearIndex );
  58    }
  59 }
  60
  61
  62
  63 void
  64 _mesa_ClearColor( GLclampf red, GLclampf green, GLclampf blue, GLclampf alpha )
  65 {
  66    GLfloat tmp[4];
  67    GET_CURRENT_CONTEXT(ctx);
  68    ASSERT_OUTSIDE_BEGIN_END(ctx);
  69
  70    tmp[0] = CLAMP(red,   0.0F, 1.0F);
  71    tmp[1] = CLAMP(green, 0.0F, 1.0F);
  72    tmp[2] = CLAMP(blue,  0.0F, 1.0F);
  73    tmp[3] = CLAMP(alpha, 0.0F, 1.0F);
  74
  75    if (TEST_EQ_4V(tmp, ctx->Color.ClearColor))
  76       return; /* no change */
  77
  78    FLUSH_VERTICES(ctx, _NEW_COLOR);
  79    COPY_4V(ctx->Color.ClearColor, tmp);
  80
  81    if (ctx->Visual.rgbMode && ctx->Driver.ClearColor) {
  82       /* it's OK to call glClearColor in CI mode but it should be a NOP */
  83       (*ctx->Driver.ClearColor)(ctx, ctx->Color.ClearColor);
  84    }
  85 }
  86
  87
  88
  89 void
  90 _mesa_Clear( GLbitfield mask )
  91 {
  92    GET_CURRENT_CONTEXT(ctx);
  93    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
  94
  95    if (MESA_VERBOSE & VERBOSE_API)
  96       _mesa_debug(ctx, "glClear 0x%x\n", mask);
  97
  98    if (mask & ~(GL_COLOR_BUFFER_BIT |
  99                 GL_DEPTH_BUFFER_BIT |
 100                 GL_STENCIL_BUFFER_BIT |
 101                 GL_ACCUM_BUFFER_BIT)) {
 102       /* invalid bit set */
 103       _mesa_error( ctx, GL_INVALID_VALUE, "glClear(mask)");
 104       return;
 105    }
 106
 107    if (ctx->NewState) {
 108       _mesa_update_state( ctx );        /* update _Xmin, etc */
 109    }
 110
 111    if (ctx->RenderMode==GL_RENDER) {
 112       const GLint x = ctx->DrawBuffer->_Xmin;
 113       const GLint y = ctx->DrawBuffer->_Ymin;
 114       const GLint height = ctx->DrawBuffer->_Ymax - ctx->DrawBuffer->_Ymin;
 115       const GLint width  = ctx->DrawBuffer->_Xmax - ctx->DrawBuffer->_Xmin;
 116       GLbitfield ddMask;
 117
 118       /* don't clear depth buffer if depth writing disabled */
 119       if (!ctx->Depth.Mask)
 120          mask &= ~GL_DEPTH_BUFFER_BIT;
 121
 122       /* Build bitmask to send to driver Clear function */
 123       ddMask = mask & (GL_DEPTH_BUFFER_BIT |
 124                        GL_STENCIL_BUFFER_BIT |
 125                        GL_ACCUM_BUFFER_BIT);
 126       if (mask & GL_COLOR_BUFFER_BIT) {
 127          ddMask |= ctx->Color._DrawDestMask;
 128       }
 129
 130       ASSERT(ctx->Driver.Clear);
 131       ctx->Driver.Clear( ctx, ddMask, (GLboolean) !ctx->Scissor.Enabled,
 132                          x, y, width, height );
 133    }
 134 }
 135
 136
 137 void
 138 _mesa_DrawBuffer( GLenum mode )
 139 {
 140    GET_CURRENT_CONTEXT(ctx);
 141    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx); /* too complex... */
 142
 143    if (MESA_VERBOSE & VERBOSE_API)
 144       _mesa_debug(ctx, "glDrawBuffer %s\n", _mesa_lookup_enum_by_nr(mode));
 145
 146    /*
 147     * Do error checking and compute the _DrawDestMask bitfield.
 148     */
 149    switch (mode) {
 150       case GL_RIGHT:
 151          if (!ctx->Visual.stereoMode) {
 152             _mesa_error( ctx, GL_INVALID_OPERATION, "glDrawBuffer" );
 153             return;}
 154          if (ctx->Visual.doubleBufferMode)
 155             ctx->Color._DrawDestMask = FRONT_RIGHT_BIT | BACK_RIGHT_BIT;
 156          else
 157             ctx->Color._DrawDestMask = FRONT_RIGHT_BIT;
 158          break;
 159       case GL_FRONT_RIGHT:
 160          if (!ctx->Visual.stereoMode) {
 161             _mesa_error( ctx, GL_INVALID_OPERATION, "glDrawBuffer" );
 162             return;
 163          }
 164          ctx->Color._DrawDestMask = FRONT_RIGHT_BIT;
 165          break;
 166       case GL_BACK_RIGHT:
 167          if (!ctx->Visual.stereoMode || !ctx->Visual.doubleBufferMode) {
 168             _mesa_error( ctx, GL_INVALID_OPERATION, "glDrawBuffer" );
 169             return;
 170          }
 171          ctx->Color._DrawDestMask = BACK_RIGHT_BIT;
 172          break;
 173       case GL_BACK_LEFT:
 174          if (!ctx->Visual.doubleBufferMode) {
 175             _mesa_error( ctx, GL_INVALID_OPERATION, "glDrawBuffer" );
 176             return;
 177          }
 178          ctx->Color._DrawDestMask = BACK_LEFT_BIT;
 179          break;
 180       case GL_FRONT_AND_BACK:
 181          if (!ctx->Visual.doubleBufferMode) {
 182             _mesa_error( ctx, GL_INVALID_OPERATION, "glDrawBuffer" );
 183             return;
 184          }
 185          if (ctx->Visual.stereoMode)
 186             ctx->Color._DrawDestMask = FRONT_LEFT_BIT | BACK_LEFT_BIT
 187                                     | FRONT_RIGHT_BIT | BACK_RIGHT_BIT;
 188          else
 189             ctx->Color._DrawDestMask = FRONT_LEFT_BIT | BACK_LEFT_BIT;
 190          break;
 191       case GL_BACK:
 192          if (!ctx->Visual.doubleBufferMode) {
 193             _mesa_error( ctx, GL_INVALID_OPERATION, "glDrawBuffer" );
 194             return;
 195          }
 196          if (ctx->Visual.stereoMode)
 197             ctx->Color._DrawDestMask = BACK_LEFT_BIT | BACK_RIGHT_BIT;
 198          else
 199             ctx->Color._DrawDestMask = BACK_LEFT_BIT;
 200          break;
 201       case GL_LEFT:
 202          /* never an error */
 203          if (ctx->Visual.doubleBufferMode)
 204             ctx->Color._DrawDestMask = FRONT_LEFT_BIT | BACK_LEFT_BIT;
 205          else
 206             ctx->Color._DrawDestMask = FRONT_LEFT_BIT;
 207          break;
 208       case GL_FRONT_LEFT:
 209          /* never an error */
 210          ctx->Color._DrawDestMask = FRONT_LEFT_BIT;
 211          break;
 212       case GL_FRONT:
 213          /* never an error */
 214          if (ctx->Visual.stereoMode)
 215             ctx->Color._DrawDestMask = FRONT_LEFT_BIT | FRONT_RIGHT_BIT;
 216          else
 217             ctx->Color._DrawDestMask = FRONT_LEFT_BIT;
 218          break;
 219       case GL_NONE:
 220          /* never an error */
 221          ctx->Color._DrawDestMask = 0;
 222          break;
 223       case GL_AUX0:
 224          if (ctx->Const.NumAuxBuffers >= 1) {
 225             ctx->Color._DrawDestMask = AUX0_BIT;
 226          }
 227          else {
 228             _mesa_error( ctx, GL_INVALID_OPERATION, "glDrawBuffer(GL_AUX0)" );
 229             return;
 230          }
 231          break;
 232       case GL_AUX1:
 233          if (ctx->Const.NumAuxBuffers >= 2) {
 234             ctx->Color._DrawDestMask = AUX1_BIT;
 235          }
 236          else {
 237             _mesa_error( ctx, GL_INVALID_OPERATION, "glDrawBuffer(GL_AUX1)" );
 238             return;
 239          }
 240          break;
 241       case GL_AUX2:
 242          if (ctx->Const.NumAuxBuffers >= 3) {
 243             ctx->Color._DrawDestMask = AUX2_BIT;
 244          }
 245          else {
 246             _mesa_error( ctx, GL_INVALID_OPERATION, "glDrawBuffer(GL_AUX2)" );
 247             return;
 248          }
 249          break;
 250       case GL_AUX3:
 251          if (ctx->Const.NumAuxBuffers >= 4) {
 252             ctx->Color._DrawDestMask = AUX3_BIT;
 253          }
 254          else {
 255             _mesa_error( ctx, GL_INVALID_OPERATION, "glDrawBuffer(GL_AUX3)" );
 256             return;
 257          }
 258          break;
 259       default:
 260          _mesa_error( ctx, GL_INVALID_ENUM, "glDrawBuffer" );
 261          return;
 262    }
 263
 264    ctx->Color.DrawBuffer = mode;
 265    ctx->NewState |= _NEW_COLOR;
 266
 267    /*
 268     * Call device driver function.
 269     */
 270    if (ctx->Driver.DrawBuffer)
 271       (*ctx->Driver.DrawBuffer)(ctx, mode);
 272 }
 273
 274
 275
 276 void
 277 _mesa_ReadBuffer( GLenum mode )
 278 {
 279    GET_CURRENT_CONTEXT(ctx);
 280    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
 281
 282    if (MESA_VERBOSE & VERBOSE_API)
 283       _mesa_debug(ctx, "glReadBuffer %s\n", _mesa_lookup_enum_by_nr(mode));
 284
 285    /*
 286     * Do error checking and compute ctx->Pixel._ReadSrcMask.
 287     */
 288    switch (mode) {
 289       case GL_LEFT:
 290       case GL_FRONT:
 291       case GL_FRONT_LEFT:
 292          /* Front-Left buffer, always exists */
 293          ctx->Pixel._ReadSrcMask = FRONT_LEFT_BIT;
 294          break;
 295       case GL_BACK:
 296       case GL_BACK_LEFT:
 297          /* Back-Left buffer, requires double buffering */
 298          if (!ctx->Visual.doubleBufferMode) {
 299             _mesa_error( ctx, GL_INVALID_OPERATION, "glReadBuffer" );
 300             return;
 301          }
 302          ctx->Pixel._ReadSrcMask = BACK_LEFT_BIT;
 303          break;
 304       case GL_FRONT_RIGHT:
 305       case GL_RIGHT:
 306          if (!ctx->Visual.stereoMode) {
 307             _mesa_error( ctx, GL_INVALID_OPERATION, "glReadBuffer" );
 308             return;
 309          }
 310          ctx->Pixel._ReadSrcMask = FRONT_RIGHT_BIT;
 311          break;
 312       case GL_BACK_RIGHT:
 313          if (!ctx->Visual.stereoMode || !ctx->Visual.doubleBufferMode) {
 314             _mesa_error( ctx, GL_INVALID_OPERATION, "glReadBuffer" );
 315             return;
 316          }
 317          ctx->Pixel._ReadSrcMask = BACK_RIGHT_BIT;
 318          break;
 319       case GL_AUX0:
 320          if (ctx->Const.NumAuxBuffers >= 1) {
 321             ctx->Pixel._ReadSrcMask = AUX0_BIT;
 322          }
 323          else {
 324             _mesa_error( ctx, GL_INVALID_OPERATION, "glReadBuffer(GL_AUX0)" );
 325             return;
 326          }
 327          break;
 328       case GL_AUX1:
 329          if (ctx->Const.NumAuxBuffers >= 2) {
 330             ctx->Pixel._ReadSrcMask = AUX1_BIT;
 331          }
 332          else {
 333             _mesa_error( ctx, GL_INVALID_OPERATION, "glReadBuffer(GL_AUX1)" );
 334             return;
 335          }
 336          break;
 337       case GL_AUX2:
 338          if (ctx->Const.NumAuxBuffers >= 3) {
 339             ctx->Pixel._ReadSrcMask = AUX2_BIT;
 340          }
 341          else {
 342             _mesa_error( ctx, GL_INVALID_OPERATION, "glReadBuffer(GL_AUX2)" );
 343             return;
 344          }
 345          break;
 346       case GL_AUX3:
 347          if (ctx->Const.NumAuxBuffers >= 4) {
 348             ctx->Pixel._ReadSrcMask = AUX3_BIT;
 349          }
 350          else {
 351             _mesa_error( ctx, GL_INVALID_OPERATION, "glReadBuffer(GL_AUX3)" );
 352             return;
 353          }
 354          break;
 355       default:
 356          _mesa_error( ctx, GL_INVALID_ENUM, "glReadBuffer" );
 357          return;
 358    }
 359
 360    ctx->Pixel.ReadBuffer = mode;
 361    ctx->NewState |= _NEW_PIXEL;
 362
 363    /*
 364     * Call device driver function.
 365     */
 366    if (ctx->Driver.ReadBuffer)
 367       (*ctx->Driver.ReadBuffer)(ctx, mode);
 368 }
 369
 370
 371 /*
 372  * GL_MESA_resize_buffers extension
 373  * When this function is called, we'll ask the window system how large
 374  * the current window is.  If it's not what we expect, we'll have to
 375  * resize/reallocate the software accum/stencil/depth/alpha buffers.
 376  */
 377 void
 378 _mesa_ResizeBuffersMESA( void )
 379 {
 380    GLcontext *ctx = _mesa_get_current_context();
 381
 382    if (MESA_VERBOSE & VERBOSE_API)
 383       _mesa_debug(ctx, "glResizeBuffersMESA\n");
 384
 385    if (ctx) {
 386       ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH( ctx );
 387
 388       if (ctx->DrawBuffer) {
 389          GLuint buf_width, buf_height;
 390          GLframebuffer *buffer = ctx->DrawBuffer;
 391
 392          /* ask device driver for size of output buffer */
 393          (*ctx->Driver.GetBufferSize)( buffer, &buf_width, &buf_height );
 394
 395          /* see if size of device driver's color buffer (window) has changed */
 396          if (buffer->Width == buf_width && buffer->Height == buf_height)
 397             return; /* size is as expected */
 398
 399          buffer->Width = buf_width;
 400          buffer->Height = buf_height;
 401
 402          ctx->Driver.ResizeBuffers( buffer );
 403       }
 404
 405       if (ctx->ReadBuffer && ctx->ReadBuffer != ctx->DrawBuffer) {
 406          GLuint buf_width, buf_height;
 407          GLframebuffer *buffer = ctx->DrawBuffer;
 408
 409          /* ask device driver for size of output buffer */
 410          (*ctx->Driver.GetBufferSize)( buffer, &buf_width, &buf_height );
 411
 412          /* see if size of device driver's color buffer (window) has changed */
 413          if (buffer->Width == buf_width && buffer->Height == buf_height)
 414             return; /* size is as expected */
 415
 416          buffer->Width = buf_width;
 417          buffer->Height = buf_height;
 418
 419          ctx->Driver.ResizeBuffers( buffer );
 420       }
 421
 422       ctx->NewState |= _NEW_BUFFERS;  /* to update scissor / window bounds */
 423    }
 424 }
 425
 426
 427 void
 428 _mesa_Scissor( GLint x, GLint y, GLsizei width, GLsizei height )
 429 {
 430    GET_CURRENT_CONTEXT(ctx);
 431    ASSERT_OUTSIDE_BEGIN_END(ctx);
 432
 433    if (width < 0 || height < 0) {
 434       _mesa_error( ctx, GL_INVALID_VALUE, "glScissor" );
 435       return;
 436    }
 437
 438    if (MESA_VERBOSE & VERBOSE_API)
 439       _mesa_debug(ctx, "glScissor %d %d %d %d\n", x, y, width, height);
 440
 441    if (x == ctx->Scissor.X &&
 442        y == ctx->Scissor.Y &&
 443        width == ctx->Scissor.Width &&
 444        height == ctx->Scissor.Height)
 445       return;
 446
 447    FLUSH_VERTICES(ctx, _NEW_SCISSOR);
 448    ctx->Scissor.X = x;
 449    ctx->Scissor.Y = y;
 450    ctx->Scissor.Width = width;
 451    ctx->Scissor.Height = height;
 452
 453    if (ctx->Driver.Scissor)
 454       ctx->Driver.Scissor( ctx, x, y, width, height );
 455 }
 456
 457
 458 /*
 459  * XXX move somewhere else someday?
 460  */
 461 void
 462 _mesa_SampleCoverageARB(GLclampf value, GLboolean invert)
 463 {
 464    GLcontext *ctx = _mesa_get_current_context();
 465
 466    if (!ctx->Extensions.ARB_multisample) {
 467       _mesa_error(ctx, GL_INVALID_OPERATION, "glSampleCoverageARB");
 468       return;
 469    }
 470
 471    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH( ctx );
 472    ctx->Multisample.SampleCoverageValue = (GLfloat) CLAMP(value, 0.0, 1.0);
 473    ctx->Multisample.SampleCoverageInvert = invert;
 474    ctx->NewState |= _NEW_MULTISAMPLE;
 475 }
 476