src/mesa/main/pixelstore.c

   1 /*
   2  * Mesa 3-D graphics library
   3  * Version:  7.1
   4  *
   5  * Copyright (C) 1999-2008  Brian Paul   All Rights Reserved.
   6  *
   7  * Permission is hereby granted, free of charge, to any person obtaining a
   8  * copy of this software and associated documentation files (the "Software"),
   9  * to deal in the Software without restriction, including without limitation
  10  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  11  * and/or sell copies of the Software, and to permit persons to whom the
  12  * Software is furnished to do so, subject to the following conditions:
  13  *
  14  * The above copyright notice and this permission notice shall be included
  15  * in all copies or substantial portions of the Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  18  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  20  * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  21  * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  22  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  23  */
  24
  25 /**
  26  * \file pixelstore.c
  27  * glPixelStore functions.
  28  */
  29
  30
  31 #include "glheader.h"
  32 #include "bufferobj.h"
  33 #include "context.h"
  34 #include "pixelstore.h"
  35 #include "mtypes.h"
  36
  37
  38 void GLAPIENTRY
  39 _mesa_PixelStorei( GLenum pname, GLint param )
  40 {
  41    /* NOTE: this call can't be compiled into the display list */
  42    GET_CURRENT_CONTEXT(ctx);
  43    ASSERT_OUTSIDE_BEGIN_END(ctx);
  44
  45    switch (pname) {
  46       case GL_PACK_SWAP_BYTES:
  47          if (param == (GLint)ctx->Pack.SwapBytes)
  48             return;
  49          FLUSH_VERTICES(ctx, _NEW_PACKUNPACK);
  50          ctx->Pack.SwapBytes = param ? GL_TRUE : GL_FALSE;
  51          break;
  52       case GL_PACK_LSB_FIRST:
  53          if (param == (GLint)ctx->Pack.LsbFirst)
  54             return;
  55          FLUSH_VERTICES(ctx, _NEW_PACKUNPACK);
  56          ctx->Pack.LsbFirst = param ? GL_TRUE : GL_FALSE;
  57          break;
  58       case GL_PACK_ROW_LENGTH:
  59          if (param<0) {
  60             _mesa_error( ctx, GL_INVALID_VALUE, "glPixelStore(param)" );
  61             return;
  62          }
  63          if (ctx->Pack.RowLength == param)
  64             return;
  65          FLUSH_VERTICES(ctx, _NEW_PACKUNPACK);
  66          ctx->Pack.RowLength = param;
  67          break;
  68       case GL_PACK_IMAGE_HEIGHT:
  69          if (param<0) {
  70             _mesa_error( ctx, GL_INVALID_VALUE, "glPixelStore(param)" );
  71             return;
  72          }
  73          if (ctx->Pack.ImageHeight == param)
  74             return;
  75          FLUSH_VERTICES(ctx, _NEW_PACKUNPACK);
  76          ctx->Pack.ImageHeight = param;
  77          break;
  78       case GL_PACK_SKIP_PIXELS:
  79          if (param<0) {
  80             _mesa_error( ctx, GL_INVALID_VALUE, "glPixelStore(param)" );
  81             return;
  82          }
  83          if (ctx->Pack.SkipPixels == param)
  84             return;
  85          FLUSH_VERTICES(ctx, _NEW_PACKUNPACK);
  86          ctx->Pack.SkipPixels = param;
  87          break;
  88       case GL_PACK_SKIP_ROWS:
  89          if (param<0) {
  90             _mesa_error( ctx, GL_INVALID_VALUE, "glPixelStore(param)" );
  91             return;
  92          }
  93          if (ctx->Pack.SkipRows == param)
  94             return;
  95          FLUSH_VERTICES(ctx, _NEW_PACKUNPACK);
  96          ctx->Pack.SkipRows = param;
  97          break;
  98       case GL_PACK_SKIP_IMAGES:
  99          if (param<0) {
 100             _mesa_error( ctx, GL_INVALID_VALUE, "glPixelStore(param)" );
 101             return;
 102          }
 103          if (ctx->Pack.SkipImages == param)
 104             return;
 105          FLUSH_VERTICES(ctx, _NEW_PACKUNPACK);
 106          ctx->Pack.SkipImages = param;
 107          break;
 108       case GL_PACK_ALIGNMENT:
 109          if (param!=1 && param!=2 && param!=4 && param!=8) {
 110             _mesa_error( ctx, GL_INVALID_VALUE, "glPixelStore(param)" );
 111             return;
 112          }
 113          if (ctx->Pack.Alignment == param)
 114             return;
 115          FLUSH_VERTICES(ctx, _NEW_PACKUNPACK);
 116          ctx->Pack.Alignment = param;
 117          break;
 118       case GL_PACK_INVERT_MESA:
 119          if (!ctx->Extensions.MESA_pack_invert) {
 120             _mesa_error( ctx, GL_INVALID_ENUM, "glPixelstore(pname)" );
 121             return;
 122          }
 123          if (ctx->Pack.Invert == param)
 124             return;
 125          FLUSH_VERTICES(ctx, _NEW_PACKUNPACK);
 126          ctx->Pack.Invert = param;
 127          break;
 128
 129       case GL_UNPACK_SWAP_BYTES:
 130          if (param == (GLint)ctx->Unpack.SwapBytes)
 131             return;
 132          if ((GLint)ctx->Unpack.SwapBytes == param)
 133             return;
 134          FLUSH_VERTICES(ctx, _NEW_PACKUNPACK);
 135          ctx->Unpack.SwapBytes = param ? GL_TRUE : GL_FALSE;
 136          break;
 137       case GL_UNPACK_LSB_FIRST:
 138          if (param == (GLint)ctx->Unpack.LsbFirst)
 139             return;
 140          if ((GLint)ctx->Unpack.LsbFirst == param)
 141             return;
 142          FLUSH_VERTICES(ctx, _NEW_PACKUNPACK);
 143          ctx->Unpack.LsbFirst = param ? GL_TRUE : GL_FALSE;
 144          break;
 145       case GL_UNPACK_ROW_LENGTH:
 146          if (param<0) {
 147             _mesa_error( ctx, GL_INVALID_VALUE, "glPixelStore(param)" );
 148             return;
 149          }
 150          if (ctx->Unpack.RowLength == param)
 151             return;
 152          FLUSH_VERTICES(ctx, _NEW_PACKUNPACK);
 153          ctx->Unpack.RowLength = param;
 154          break;
 155       case GL_UNPACK_IMAGE_HEIGHT:
 156          if (param<0) {
 157             _mesa_error( ctx, GL_INVALID_VALUE, "glPixelStore(param)" );
 158             return;
 159          }
 160          if (ctx->Unpack.ImageHeight == param)
 161             return;
 162
 163          FLUSH_VERTICES(ctx, _NEW_PACKUNPACK);
 164          ctx->Unpack.ImageHeight = param;
 165          break;
 166       case GL_UNPACK_SKIP_PIXELS:
 167          if (param<0) {
 168             _mesa_error( ctx, GL_INVALID_VALUE, "glPixelStore(param)" );
 169             return;
 170          }
 171          if (ctx->Unpack.SkipPixels == param)
 172             return;
 173          FLUSH_VERTICES(ctx, _NEW_PACKUNPACK);
 174          ctx->Unpack.SkipPixels = param;
 175          break;
 176       case GL_UNPACK_SKIP_ROWS:
 177          if (param<0) {
 178             _mesa_error( ctx, GL_INVALID_VALUE, "glPixelStore(param)" );
 179             return;
 180          }
 181          if (ctx->Unpack.SkipRows == param)
 182             return;
 183          FLUSH_VERTICES(ctx, _NEW_PACKUNPACK);
 184          ctx->Unpack.SkipRows = param;
 185          break;
 186       case GL_UNPACK_SKIP_IMAGES:
 187          if (param < 0) {
 188             _mesa_error( ctx, GL_INVALID_VALUE, "glPixelStore(param)" );
 189             return;
 190          }
 191          if (ctx->Unpack.SkipImages == param)
 192             return;
 193          FLUSH_VERTICES(ctx, _NEW_PACKUNPACK);
 194          ctx->Unpack.SkipImages = param;
 195          break;
 196       case GL_UNPACK_ALIGNMENT:
 197          if (param!=1 && param!=2 && param!=4 && param!=8) {
 198             _mesa_error( ctx, GL_INVALID_VALUE, "glPixelStore" );
 199             return;
 200          }
 201          if (ctx->Unpack.Alignment == param)
 202             return;
 203          FLUSH_VERTICES(ctx, _NEW_PACKUNPACK);
 204          ctx->Unpack.Alignment = param;
 205          break;
 206       case GL_UNPACK_CLIENT_STORAGE_APPLE:
 207          if (param == (GLint)ctx->Unpack.ClientStorage)
 208             return;
 209          FLUSH_VERTICES(ctx, _NEW_PACKUNPACK);
 210          ctx->Unpack.ClientStorage = param ? GL_TRUE : GL_FALSE;
 211          break;
 212       default:
 213          _mesa_error( ctx, GL_INVALID_ENUM, "glPixelStore" );
 214          return;
 215    }
 216 }
 217
 218
 219 void GLAPIENTRY
 220 _mesa_PixelStoref( GLenum pname, GLfloat param )
 221 {
 222    _mesa_PixelStorei( pname, (GLint) param );
 223 }
 224
 225
 226
 227 /**
 228  * Initialize the context's pixel store state.
 229  */
 230 void
 231 _mesa_init_pixelstore( GLcontext *ctx )
 232 {
 233    /* Pixel transfer */
 234    ctx->Pack.Alignment = 4;
 235    ctx->Pack.RowLength = 0;
 236    ctx->Pack.ImageHeight = 0;
 237    ctx->Pack.SkipPixels = 0;
 238    ctx->Pack.SkipRows = 0;
 239    ctx->Pack.SkipImages = 0;
 240    ctx->Pack.SwapBytes = GL_FALSE;
 241    ctx->Pack.LsbFirst = GL_FALSE;
 242    ctx->Pack.ClientStorage = GL_FALSE;
 243    ctx->Pack.Invert = GL_FALSE;
 244 #if FEATURE_EXT_pixel_buffer_object
 245    _mesa_reference_buffer_object(ctx, &ctx->Pack.BufferObj,
 246                                  ctx->Shared->NullBufferObj);
 247 #endif
 248    ctx->Unpack.Alignment = 4;
 249    ctx->Unpack.RowLength = 0;
 250    ctx->Unpack.ImageHeight = 0;
 251    ctx->Unpack.SkipPixels = 0;
 252    ctx->Unpack.SkipRows = 0;
 253    ctx->Unpack.SkipImages = 0;
 254    ctx->Unpack.SwapBytes = GL_FALSE;
 255    ctx->Unpack.LsbFirst = GL_FALSE;
 256    ctx->Unpack.ClientStorage = GL_FALSE;
 257    ctx->Unpack.Invert = GL_FALSE;
 258 #if FEATURE_EXT_pixel_buffer_object
 259    _mesa_reference_buffer_object(ctx, &ctx->Unpack.BufferObj,
 260                                  ctx->Shared->NullBufferObj);
 261 #endif
 262
 263    /*
 264     * _mesa_unpack_image() returns image data in this format.  When we
 265     * execute image commands (glDrawPixels(), glTexImage(), etc) from
 266     * within display lists we have to be sure to set the current
 267     * unpacking parameters to these values!
 268     */
 269    ctx->DefaultPacking.Alignment = 1;
 270    ctx->DefaultPacking.RowLength = 0;
 271    ctx->DefaultPacking.SkipPixels = 0;
 272    ctx->DefaultPacking.SkipRows = 0;
 273    ctx->DefaultPacking.ImageHeight = 0;
 274    ctx->DefaultPacking.SkipImages = 0;
 275    ctx->DefaultPacking.SwapBytes = GL_FALSE;
 276    ctx->DefaultPacking.LsbFirst = GL_FALSE;
 277    ctx->DefaultPacking.ClientStorage = GL_FALSE;
 278    ctx->DefaultPacking.Invert = GL_FALSE;
 279 #if FEATURE_EXT_pixel_buffer_object
 280    _mesa_reference_buffer_object(ctx, &ctx->DefaultPacking.BufferObj,
 281                                  ctx->Shared->NullBufferObj);
 282 #endif
 283 }