src/mesa/main/buffers.c

   1 /* $Id: buffers.c,v 1.39 2002/10/11 00:02:16 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 #ifdef PC_HEADER
  29 #include "all.h"
  30 #else
  31 #include "glheader.h"
  32 #include "accum.h"
  33 #include "buffers.h"
  34 #include "colormac.h"
  35 #include "context.h"
  36 #include "depth.h"
  37 #include "enums.h"
  38 #include "macros.h"
  39 #include "mem.h"
  40 #include "stencil.h"
  41 #include "state.h"
  42 #include "mtypes.h"
  43 #endif
  44
  45
  46
  47 void
  48 _mesa_ClearIndex( GLfloat c )
  49 {
  50    GET_CURRENT_CONTEXT(ctx);
  51    ASSERT_OUTSIDE_BEGIN_END(ctx);
  52
  53    if (ctx->Color.ClearIndex == (GLuint) c)
  54       return;
  55
  56    FLUSH_VERTICES(ctx, _NEW_COLOR);
  57    ctx->Color.ClearIndex = (GLuint) c;
  58
  59    if (!ctx->Visual.rgbMode && ctx->Driver.ClearIndex) {
  60       /* it's OK to call glClearIndex in RGBA mode but it should be a NOP */
  61       (*ctx->Driver.ClearIndex)( ctx, ctx->Color.ClearIndex );
  62    }
  63 }
  64
  65
  66
  67 void
  68 _mesa_ClearColor( GLclampf red, GLclampf green, GLclampf blue, GLclampf alpha )
  69 {
  70    GLfloat tmp[4];
  71    GET_CURRENT_CONTEXT(ctx);
  72    ASSERT_OUTSIDE_BEGIN_END(ctx);
  73
  74    tmp[0] = CLAMP(red,   0.0F, 1.0F);
  75    tmp[1] = CLAMP(green, 0.0F, 1.0F);
  76    tmp[2] = CLAMP(blue,  0.0F, 1.0F);
  77    tmp[3] = CLAMP(alpha, 0.0F, 1.0F);
  78
  79    if (TEST_EQ_4V(tmp, ctx->Color.ClearColor))
  80       return; /* no change */
  81
  82    FLUSH_VERTICES(ctx, _NEW_COLOR);
  83    COPY_4V(ctx->Color.ClearColor, tmp);
  84
  85    if (ctx->Visual.rgbMode && ctx->Driver.ClearColor) {
  86       /* it's OK to call glClearColor in CI mode but it should be a NOP */
  87       (*ctx->Driver.ClearColor)(ctx, ctx->Color.ClearColor);
  88    }
  89 }
  90
  91
  92
  93 void
  94 _mesa_Clear( GLbitfield mask )
  95 {
  96    GET_CURRENT_CONTEXT(ctx);
  97    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
  98
  99    if (MESA_VERBOSE & VERBOSE_API)
 100       _mesa_debug(ctx, "glClear 0x%x\n", mask);
 101
 102    if (mask & ~(GL_COLOR_BUFFER_BIT |
 103                 GL_DEPTH_BUFFER_BIT |
 104                 GL_STENCIL_BUFFER_BIT |
 105                 GL_ACCUM_BUFFER_BIT)) {
 106       /* invalid bit set */
 107       _mesa_error( ctx, GL_INVALID_VALUE, "glClear(mask)");
 108       return;
 109    }
 110
 111    if (ctx->NewState) {
 112       _mesa_update_state( ctx );        /* update _Xmin, etc */
 113    }
 114
 115    if (ctx->RenderMode==GL_RENDER) {
 116       const GLint x = ctx->DrawBuffer->_Xmin;
 117       const GLint y = ctx->DrawBuffer->_Ymin;
 118       const GLint height = ctx->DrawBuffer->_Ymax - ctx->DrawBuffer->_Ymin;
 119       const GLint width  = ctx->DrawBuffer->_Xmax - ctx->DrawBuffer->_Xmin;
 120       GLbitfield ddMask;
 121
 122       /* don't clear depth buffer if depth writing disabled */
 123       if (!ctx->Depth.Mask)
 124          mask &= ~GL_DEPTH_BUFFER_BIT;
 125
 126       /* Build bitmask to send to driver Clear function */
 127       ddMask = mask & (GL_DEPTH_BUFFER_BIT |
 128                        GL_STENCIL_BUFFER_BIT |
 129                        GL_ACCUM_BUFFER_BIT);
 130       if (mask & GL_COLOR_BUFFER_BIT) {
 131          ddMask |= ctx->Color._DrawDestMask;
 132       }
 133
 134       ASSERT(ctx->Driver.Clear);
 135       ctx->Driver.Clear( ctx, ddMask, (GLboolean) !ctx->Scissor.Enabled,
 136                          x, y, width, height );
 137    }
 138 }
 139
 140
 141 void
 142 _mesa_DrawBuffer( GLenum mode )
 143 {
 144    GET_CURRENT_CONTEXT(ctx);
 145    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx); /* too complex... */
 146
 147    if (MESA_VERBOSE & VERBOSE_API)
 148       _mesa_debug(ctx, "glDrawBuffer %s\n", _mesa_lookup_enum_by_nr(mode));
 149
 150    if (ctx->Color.DrawBuffer == mode)
 151       return; /* no change */
 152
 153    /*
 154     * Do error checking and compute the _DrawDestMask bitfield.
 155     */
 156    switch (mode) {
 157       case GL_AUX0:
 158       case GL_AUX1:
 159       case GL_AUX2:
 160       case GL_AUX3:
 161          /* AUX buffers not implemented in Mesa at this time */
 162          _mesa_error( ctx, GL_INVALID_OPERATION, "glDrawBuffer" );
 163          return;
 164       case GL_RIGHT:
 165          if (!ctx->Visual.stereoMode) {
 166             _mesa_error( ctx, GL_INVALID_OPERATION, "glDrawBuffer" );
 167             return;}
 168          if (ctx->Visual.doubleBufferMode)
 169             ctx->Color._DrawDestMask = FRONT_RIGHT_BIT | BACK_RIGHT_BIT;
 170          else
 171             ctx->Color._DrawDestMask = FRONT_RIGHT_BIT;
 172          break;
 173       case GL_FRONT_RIGHT:
 174          if (!ctx->Visual.stereoMode) {
 175             _mesa_error( ctx, GL_INVALID_OPERATION, "glDrawBuffer" );
 176             return;
 177          }
 178          ctx->Color._DrawDestMask = FRONT_RIGHT_BIT;
 179          break;
 180       case GL_BACK_RIGHT:
 181          if (!ctx->Visual.stereoMode) {
 182             _mesa_error( ctx, GL_INVALID_OPERATION, "glDrawBuffer" );
 183             return;
 184          }
 185          if (!ctx->Visual.doubleBufferMode) {
 186             _mesa_error( ctx, GL_INVALID_OPERATION, "glDrawBuffer" );
 187             return;
 188          }
 189          ctx->Color._DrawDestMask = BACK_RIGHT_BIT;
 190          break;
 191       case GL_BACK_LEFT:
 192          if (!ctx->Visual.doubleBufferMode) {
 193             _mesa_error( ctx, GL_INVALID_OPERATION, "glDrawBuffer" );
 194             return;
 195          }
 196          ctx->Color._DrawDestMask = BACK_LEFT_BIT;
 197          break;
 198       case GL_FRONT_AND_BACK:
 199          if (!ctx->Visual.doubleBufferMode) {
 200             _mesa_error( ctx, GL_INVALID_OPERATION, "glDrawBuffer" );
 201             return;
 202          }
 203          if (ctx->Visual.stereoMode)
 204             ctx->Color._DrawDestMask = FRONT_LEFT_BIT | BACK_LEFT_BIT
 205                                     | FRONT_RIGHT_BIT | BACK_RIGHT_BIT;
 206          else
 207             ctx->Color._DrawDestMask = FRONT_LEFT_BIT | BACK_LEFT_BIT;
 208          break;
 209       case GL_BACK:
 210          if (!ctx->Visual.doubleBufferMode) {
 211             _mesa_error( ctx, GL_INVALID_OPERATION, "glDrawBuffer" );
 212             return;
 213          }
 214          if (ctx->Visual.stereoMode)
 215             ctx->Color._DrawDestMask = BACK_LEFT_BIT | BACK_RIGHT_BIT;
 216          else
 217             ctx->Color._DrawDestMask = BACK_LEFT_BIT;
 218          break;
 219       case GL_LEFT:
 220          /* never an error */
 221          if (ctx->Visual.doubleBufferMode)
 222             ctx->Color._DrawDestMask = FRONT_LEFT_BIT | BACK_LEFT_BIT;
 223          else
 224             ctx->Color._DrawDestMask = FRONT_LEFT_BIT;
 225          break;
 226       case GL_FRONT_LEFT:
 227          /* never an error */
 228          ctx->Color._DrawDestMask = FRONT_LEFT_BIT;
 229          break;
 230       case GL_FRONT:
 231          /* never an error */
 232          if (ctx->Visual.stereoMode)
 233             ctx->Color._DrawDestMask = FRONT_LEFT_BIT | FRONT_RIGHT_BIT;
 234          else
 235             ctx->Color._DrawDestMask = FRONT_LEFT_BIT;
 236          break;
 237       case GL_NONE:
 238          /* never an error */
 239          ctx->Color._DrawDestMask = 0;
 240          break;
 241       default:
 242          _mesa_error( ctx, GL_INVALID_ENUM, "glDrawBuffer" );
 243          return;
 244    }
 245
 246    ctx->Color.DrawBuffer = mode;
 247    ctx->NewState |= _NEW_COLOR;
 248
 249    /*
 250     * Call device driver function.
 251     */
 252    if (ctx->Driver.DrawBuffer)
 253       (*ctx->Driver.DrawBuffer)(ctx, mode);
 254 }
 255
 256
 257
 258 void
 259 _mesa_ReadBuffer( GLenum mode )
 260 {
 261    GET_CURRENT_CONTEXT(ctx);
 262    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
 263
 264    if (MESA_VERBOSE & VERBOSE_API)
 265       _mesa_debug(ctx, "glReadBuffer %s\n", _mesa_lookup_enum_by_nr(mode));
 266
 267    if (ctx->Pixel.ReadBuffer == mode)
 268       return; /* no change */
 269
 270    switch (mode) {
 271       case GL_AUX0:
 272       case GL_AUX1:
 273       case GL_AUX2:
 274       case GL_AUX3:
 275          /* AUX buffers not implemented in Mesa at this time */
 276          _mesa_error( ctx, GL_INVALID_OPERATION, "glReadBuffer" );
 277          return;
 278       case GL_LEFT:
 279       case GL_FRONT:
 280       case GL_FRONT_LEFT:
 281          /* Front-Left buffer, always exists */
 282          ctx->Pixel._DriverReadBuffer = GL_FRONT_LEFT;
 283          break;
 284       case GL_BACK:
 285       case GL_BACK_LEFT:
 286          /* Back-Left buffer, requires double buffering */
 287          if (!ctx->Visual.doubleBufferMode) {
 288             _mesa_error( ctx, GL_INVALID_OPERATION, "glReadBuffer" );
 289             return;
 290          }
 291          ctx->Pixel._DriverReadBuffer = GL_BACK_LEFT;
 292          break;
 293       case GL_FRONT_RIGHT:
 294       case GL_RIGHT:
 295          if (!ctx->Visual.stereoMode) {
 296             _mesa_error( ctx, GL_INVALID_OPERATION, "glReadBuffer" );
 297             return;
 298          }
 299          ctx->Pixel._DriverReadBuffer = GL_FRONT_RIGHT;
 300          break;
 301       case GL_BACK_RIGHT:
 302          if (!ctx->Visual.stereoMode || !ctx->Visual.doubleBufferMode) {
 303             _mesa_error( ctx, GL_INVALID_OPERATION, "glReadBuffer" );
 304             return;
 305          }
 306          ctx->Pixel._DriverReadBuffer = GL_BACK_RIGHT;
 307          break;
 308       default:
 309          _mesa_error( ctx, GL_INVALID_ENUM, "glReadBuffer" );
 310          return;
 311    }
 312
 313    ctx->Pixel.ReadBuffer = mode;
 314    ctx->NewState |= _NEW_PIXEL;
 315
 316    /*
 317     * Call device driver function.
 318     */
 319    if (ctx->Driver.ReadBuffer)
 320       (*ctx->Driver.ReadBuffer)(ctx, mode);
 321 }
 322
 323
 324 /*
 325  * GL_MESA_resize_buffers extension
 326  * When this function is called, we'll ask the window system how large
 327  * the current window is.  If it's not what we expect, we'll have to
 328  * resize/reallocate the software accum/stencil/depth/alpha buffers.
 329  */
 330 void
 331 _mesa_ResizeBuffersMESA( void )
 332 {
 333    GLcontext *ctx = _mesa_get_current_context();
 334
 335    if (MESA_VERBOSE & VERBOSE_API)
 336       _mesa_debug(ctx, "glResizeBuffersMESA\n");
 337
 338    if (ctx) {
 339       ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH( ctx );
 340
 341       if (ctx->DrawBuffer) {
 342          GLuint buf_width, buf_height;
 343          GLframebuffer *buffer = ctx->DrawBuffer;
 344
 345          /* ask device driver for size of output buffer */
 346          (*ctx->Driver.GetBufferSize)( buffer, &buf_width, &buf_height );
 347
 348          /* see if size of device driver's color buffer (window) has changed */
 349          if (buffer->Width == buf_width && buffer->Height == buf_height)
 350             return; /* size is as expected */
 351
 352          buffer->Width = buf_width;
 353          buffer->Height = buf_height;
 354
 355          ctx->Driver.ResizeBuffers( buffer );
 356       }
 357
 358       if (ctx->ReadBuffer && ctx->ReadBuffer != ctx->DrawBuffer) {
 359          GLuint buf_width, buf_height;
 360          GLframebuffer *buffer = ctx->DrawBuffer;
 361
 362          /* ask device driver for size of output buffer */
 363          (*ctx->Driver.GetBufferSize)( buffer, &buf_width, &buf_height );
 364
 365          /* see if size of device driver's color buffer (window) has changed */
 366          if (buffer->Width == buf_width && buffer->Height == buf_height)
 367             return; /* size is as expected */
 368
 369          buffer->Width = buf_width;
 370          buffer->Height = buf_height;
 371
 372          ctx->Driver.ResizeBuffers( buffer );
 373       }
 374
 375       ctx->NewState |= _NEW_BUFFERS;  /* to update scissor / window bounds */
 376    }
 377 }
 378
 379
 380 void
 381 _mesa_Scissor( GLint x, GLint y, GLsizei width, GLsizei height )
 382 {
 383    GET_CURRENT_CONTEXT(ctx);
 384    ASSERT_OUTSIDE_BEGIN_END(ctx);
 385
 386    if (width < 0 || height < 0) {
 387       _mesa_error( ctx, GL_INVALID_VALUE, "glScissor" );
 388       return;
 389    }
 390
 391    if (MESA_VERBOSE & VERBOSE_API)
 392       _mesa_debug(ctx, "glScissor %d %d %d %d\n", x, y, width, height);
 393
 394    if (x == ctx->Scissor.X &&
 395        y == ctx->Scissor.Y &&
 396        width == ctx->Scissor.Width &&
 397        height == ctx->Scissor.Height)
 398       return;
 399
 400    FLUSH_VERTICES(ctx, _NEW_SCISSOR);
 401    ctx->Scissor.X = x;
 402    ctx->Scissor.Y = y;
 403    ctx->Scissor.Width = width;
 404    ctx->Scissor.Height = height;
 405
 406    if (ctx->Driver.Scissor)
 407       ctx->Driver.Scissor( ctx, x, y, width, height );
 408 }
 409
 410
 411 /*
 412  * XXX move somewhere else someday?
 413  */
 414 void
 415 _mesa_SampleCoverageARB(GLclampf value, GLboolean invert)
 416 {
 417    GLcontext *ctx = _mesa_get_current_context();
 418
 419    if (!ctx->Extensions.ARB_multisample) {
 420       _mesa_error(ctx, GL_INVALID_OPERATION, "glSampleCoverageARB");
 421       return;
 422    }
 423
 424    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH( ctx );
 425    ctx->Multisample.SampleCoverageValue = (GLfloat) CLAMP(value, 0.0, 1.0);
 426    ctx->Multisample.SampleCoverageInvert = invert;
 427    ctx->NewState |= _NEW_MULTISAMPLE;
 428 }
 429