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 "colormac.h"
  34 #include "context.h"
  35 #include "image.h"
  36 #include "macros.h"
  37 #include "pixelstore.h"
  38 #include "mtypes.h"
  39
  40
  41 void GLAPIENTRY
  42 _mesa_PixelStorei( GLenum pname, GLint param )
  43 {
  44    /* NOTE: this call can't be compiled into the display list */
  45    GET_CURRENT_CONTEXT(ctx);
  46    ASSERT_OUTSIDE_BEGIN_END(ctx);
  47
  48    switch (pname) {
  49       case GL_PACK_SWAP_BYTES:
  50          if (param == (GLint)ctx->Pack.SwapBytes)
  51             return;
  52          FLUSH_VERTICES(ctx, _NEW_PACKUNPACK);
  53          ctx->Pack.SwapBytes = param ? GL_TRUE : GL_FALSE;
  54          break;
  55       case GL_PACK_LSB_FIRST:
  56          if (param == (GLint)ctx->Pack.LsbFirst)
  57             return;
  58          FLUSH_VERTICES(ctx, _NEW_PACKUNPACK);
  59          ctx->Pack.LsbFirst = param ? GL_TRUE : GL_FALSE;
  60          break;
  61       case GL_PACK_ROW_LENGTH:
  62          if (param<0) {
  63             _mesa_error( ctx, GL_INVALID_VALUE, "glPixelStore(param)" );
  64             return;
  65          }
  66          if (ctx->Pack.RowLength == param)
  67             return;
  68          FLUSH_VERTICES(ctx, _NEW_PACKUNPACK);
  69          ctx->Pack.RowLength = param;
  70          break;
  71       case GL_PACK_IMAGE_HEIGHT:
  72          if (param<0) {
  73             _mesa_error( ctx, GL_INVALID_VALUE, "glPixelStore(param)" );
  74             return;
  75          }
  76          if (ctx->Pack.ImageHeight == param)
  77             return;
  78          FLUSH_VERTICES(ctx, _NEW_PACKUNPACK);
  79          ctx->Pack.ImageHeight = param;
  80          break;
  81       case GL_PACK_SKIP_PIXELS:
  82          if (param<0) {
  83             _mesa_error( ctx, GL_INVALID_VALUE, "glPixelStore(param)" );
  84             return;
  85          }
  86          if (ctx->Pack.SkipPixels == param)
  87             return;
  88          FLUSH_VERTICES(ctx, _NEW_PACKUNPACK);
  89          ctx->Pack.SkipPixels = param;
  90          break;
  91       case GL_PACK_SKIP_ROWS:
  92          if (param<0) {
  93             _mesa_error( ctx, GL_INVALID_VALUE, "glPixelStore(param)" );
  94             return;
  95          }
  96          if (ctx->Pack.SkipRows == param)
  97             return;
  98          FLUSH_VERTICES(ctx, _NEW_PACKUNPACK);
  99          ctx->Pack.SkipRows = param;
 100          break;
 101       case GL_PACK_SKIP_IMAGES:
 102          if (param<0) {
 103             _mesa_error( ctx, GL_INVALID_VALUE, "glPixelStore(param)" );
 104             return;
 105          }
 106          if (ctx->Pack.SkipImages == param)
 107             return;
 108          FLUSH_VERTICES(ctx, _NEW_PACKUNPACK);
 109          ctx->Pack.SkipImages = param;
 110          break;
 111       case GL_PACK_ALIGNMENT:
 112          if (param!=1 && param!=2 && param!=4 && param!=8) {
 113             _mesa_error( ctx, GL_INVALID_VALUE, "glPixelStore(param)" );
 114             return;
 115          }
 116          if (ctx->Pack.Alignment == param)
 117             return;
 118          FLUSH_VERTICES(ctx, _NEW_PACKUNPACK);
 119          ctx->Pack.Alignment = param;
 120          break;
 121       case GL_PACK_INVERT_MESA:
 122          if (!ctx->Extensions.MESA_pack_invert) {
 123             _mesa_error( ctx, GL_INVALID_ENUM, "glPixelstore(pname)" );
 124             return;
 125          }
 126          if (ctx->Pack.Invert == param)
 127             return;
 128          FLUSH_VERTICES(ctx, _NEW_PACKUNPACK);
 129          ctx->Pack.Invert = param;
 130          break;
 131
 132       case GL_UNPACK_SWAP_BYTES:
 133          if (param == (GLint)ctx->Unpack.SwapBytes)
 134             return;
 135          if ((GLint)ctx->Unpack.SwapBytes == param)
 136             return;
 137          FLUSH_VERTICES(ctx, _NEW_PACKUNPACK);
 138          ctx->Unpack.SwapBytes = param ? GL_TRUE : GL_FALSE;
 139          break;
 140       case GL_UNPACK_LSB_FIRST:
 141          if (param == (GLint)ctx->Unpack.LsbFirst)
 142             return;
 143          if ((GLint)ctx->Unpack.LsbFirst == param)
 144             return;
 145          FLUSH_VERTICES(ctx, _NEW_PACKUNPACK);
 146          ctx->Unpack.LsbFirst = param ? GL_TRUE : GL_FALSE;
 147          break;
 148       case GL_UNPACK_ROW_LENGTH:
 149          if (param<0) {
 150             _mesa_error( ctx, GL_INVALID_VALUE, "glPixelStore(param)" );
 151             return;
 152          }
 153          if (ctx->Unpack.RowLength == param)
 154             return;
 155          FLUSH_VERTICES(ctx, _NEW_PACKUNPACK);
 156          ctx->Unpack.RowLength = param;
 157          break;
 158       case GL_UNPACK_IMAGE_HEIGHT:
 159          if (param<0) {
 160             _mesa_error( ctx, GL_INVALID_VALUE, "glPixelStore(param)" );
 161             return;
 162          }
 163          if (ctx->Unpack.ImageHeight == param)
 164             return;
 165
 166          FLUSH_VERTICES(ctx, _NEW_PACKUNPACK);
 167          ctx->Unpack.ImageHeight = param;
 168          break;
 169       case GL_UNPACK_SKIP_PIXELS:
 170          if (param<0) {
 171             _mesa_error( ctx, GL_INVALID_VALUE, "glPixelStore(param)" );
 172             return;
 173          }
 174          if (ctx->Unpack.SkipPixels == param)
 175             return;
 176          FLUSH_VERTICES(ctx, _NEW_PACKUNPACK);
 177          ctx->Unpack.SkipPixels = param;
 178          break;
 179       case GL_UNPACK_SKIP_ROWS:
 180          if (param<0) {
 181             _mesa_error( ctx, GL_INVALID_VALUE, "glPixelStore(param)" );
 182             return;
 183          }
 184          if (ctx->Unpack.SkipRows == param)
 185             return;
 186          FLUSH_VERTICES(ctx, _NEW_PACKUNPACK);
 187          ctx->Unpack.SkipRows = param;
 188          break;
 189       case GL_UNPACK_SKIP_IMAGES:
 190          if (param < 0) {
 191             _mesa_error( ctx, GL_INVALID_VALUE, "glPixelStore(param)" );
 192             return;
 193          }
 194          if (ctx->Unpack.SkipImages == param)
 195             return;
 196          FLUSH_VERTICES(ctx, _NEW_PACKUNPACK);
 197          ctx->Unpack.SkipImages = param;
 198          break;
 199       case GL_UNPACK_ALIGNMENT:
 200          if (param!=1 && param!=2 && param!=4 && param!=8) {
 201             _mesa_error( ctx, GL_INVALID_VALUE, "glPixelStore" );
 202             return;
 203          }
 204          if (ctx->Unpack.Alignment == param)
 205             return;
 206          FLUSH_VERTICES(ctx, _NEW_PACKUNPACK);
 207          ctx->Unpack.Alignment = param;
 208          break;
 209       case GL_UNPACK_CLIENT_STORAGE_APPLE:
 210          if (param == (GLint)ctx->Unpack.ClientStorage)
 211             return;
 212          FLUSH_VERTICES(ctx, _NEW_PACKUNPACK);
 213          ctx->Unpack.ClientStorage = param ? GL_TRUE : GL_FALSE;
 214          break;
 215       default:
 216          _mesa_error( ctx, GL_INVALID_ENUM, "glPixelStore" );
 217          return;
 218    }
 219 }
 220
 221
 222 void GLAPIENTRY
 223 _mesa_PixelStoref( GLenum pname, GLfloat param )
 224 {
 225    _mesa_PixelStorei( pname, (GLint) param );
 226 }
 227
 228
 229
 230 /**
 231  * Initialize the context's pixel store state.
 232  */
 233 void
 234 _mesa_init_pixelstore( GLcontext *ctx )
 235 {
 236    /* Pixel transfer */
 237    ctx->Pack.Alignment = 4;
 238    ctx->Pack.RowLength = 0;
 239    ctx->Pack.ImageHeight = 0;
 240    ctx->Pack.SkipPixels = 0;
 241    ctx->Pack.SkipRows = 0;
 242    ctx->Pack.SkipImages = 0;
 243    ctx->Pack.SwapBytes = GL_FALSE;
 244    ctx->Pack.LsbFirst = GL_FALSE;
 245    ctx->Pack.ClientStorage = GL_FALSE;
 246    ctx->Pack.Invert = GL_FALSE;
 247 #if FEATURE_EXT_pixel_buffer_object
 248    _mesa_reference_buffer_object(ctx, &ctx->Pack.BufferObj,
 249                                  ctx->Shared->NullBufferObj);
 250 #endif
 251    ctx->Unpack.Alignment = 4;
 252    ctx->Unpack.RowLength = 0;
 253    ctx->Unpack.ImageHeight = 0;
 254    ctx->Unpack.SkipPixels = 0;
 255    ctx->Unpack.SkipRows = 0;
 256    ctx->Unpack.SkipImages = 0;
 257    ctx->Unpack.SwapBytes = GL_FALSE;
 258    ctx->Unpack.LsbFirst = GL_FALSE;
 259    ctx->Unpack.ClientStorage = GL_FALSE;
 260    ctx->Unpack.Invert = GL_FALSE;
 261 #if FEATURE_EXT_pixel_buffer_object
 262    _mesa_reference_buffer_object(ctx, &ctx->Unpack.BufferObj,
 263                                  ctx->Shared->NullBufferObj);
 264 #endif
 265
 266    /*
 267     * _mesa_unpack_image() returns image data in this format.  When we
 268     * execute image commands (glDrawPixels(), glTexImage(), etc) from
 269     * within display lists we have to be sure to set the current
 270     * unpacking parameters to these values!
 271     */
 272    ctx->DefaultPacking.Alignment = 1;
 273    ctx->DefaultPacking.RowLength = 0;
 274    ctx->DefaultPacking.SkipPixels = 0;
 275    ctx->DefaultPacking.SkipRows = 0;
 276    ctx->DefaultPacking.ImageHeight = 0;
 277    ctx->DefaultPacking.SkipImages = 0;
 278    ctx->DefaultPacking.SwapBytes = GL_FALSE;
 279    ctx->DefaultPacking.LsbFirst = GL_FALSE;
 280    ctx->DefaultPacking.ClientStorage = GL_FALSE;
 281    ctx->DefaultPacking.Invert = GL_FALSE;
 282 #if FEATURE_EXT_pixel_buffer_object
 283    _mesa_reference_buffer_object(ctx, &ctx->DefaultPacking.BufferObj,
 284                                  ctx->Shared->NullBufferObj);
 285 #endif
 286 }