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 "mfeatures.h"
  36 #include "mtypes.h"
  37
  38
  39 void GLAPIENTRY
  40 _mesa_PixelStorei( GLenum pname, GLint param )
  41 {
  42    /* NOTE: this call can't be compiled into the display list */
  43    GET_CURRENT_CONTEXT(ctx);
  44    ASSERT_OUTSIDE_BEGIN_END(ctx);
  45
  46    switch (pname) {
  47       case GL_PACK_SWAP_BYTES:
  48          if (!_mesa_is_desktop_gl(ctx))
  49             goto invalid_enum_error;
  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 (!_mesa_is_desktop_gl(ctx))
  57             goto invalid_enum_error;
  58          if (param == (GLint)ctx->Pack.LsbFirst)
  59             return;
  60          FLUSH_VERTICES(ctx, _NEW_PACKUNPACK);
  61          ctx->Pack.LsbFirst = param ? GL_TRUE : GL_FALSE;
  62          break;
  63       case GL_PACK_ROW_LENGTH:
  64          if (!_mesa_is_desktop_gl(ctx) && !_mesa_is_gles3(ctx))
  65             goto invalid_enum_error;
  66          if (param<0) {
  67             _mesa_error( ctx, GL_INVALID_VALUE, "glPixelStore(param)" );
  68             return;
  69          }
  70          if (ctx->Pack.RowLength == param)
  71             return;
  72          FLUSH_VERTICES(ctx, _NEW_PACKUNPACK);
  73          ctx->Pack.RowLength = param;
  74          break;
  75       case GL_PACK_IMAGE_HEIGHT:
  76          if (!_mesa_is_desktop_gl(ctx) && !_mesa_is_gles3(ctx))
  77             goto invalid_enum_error;
  78          if (param<0) {
  79             _mesa_error( ctx, GL_INVALID_VALUE, "glPixelStore(param)" );
  80             return;
  81          }
  82          if (ctx->Pack.ImageHeight == param)
  83             return;
  84          FLUSH_VERTICES(ctx, _NEW_PACKUNPACK);
  85          ctx->Pack.ImageHeight = param;
  86          break;
  87       case GL_PACK_SKIP_PIXELS:
  88          if (!_mesa_is_desktop_gl(ctx) && !_mesa_is_gles3(ctx))
  89             goto invalid_enum_error;
  90          if (param<0) {
  91             _mesa_error( ctx, GL_INVALID_VALUE, "glPixelStore(param)" );
  92             return;
  93          }
  94          if (ctx->Pack.SkipPixels == param)
  95             return;
  96          FLUSH_VERTICES(ctx, _NEW_PACKUNPACK);
  97          ctx->Pack.SkipPixels = param;
  98          break;
  99       case GL_PACK_SKIP_ROWS:
 100          if (!_mesa_is_desktop_gl(ctx) && !_mesa_is_gles3(ctx))
 101             goto invalid_enum_error;
 102          if (param<0) {
 103             _mesa_error( ctx, GL_INVALID_VALUE, "glPixelStore(param)" );
 104             return;
 105          }
 106          if (ctx->Pack.SkipRows == param)
 107             return;
 108          FLUSH_VERTICES(ctx, _NEW_PACKUNPACK);
 109          ctx->Pack.SkipRows = param;
 110          break;
 111       case GL_PACK_SKIP_IMAGES:
 112          if (!_mesa_is_desktop_gl(ctx) && !_mesa_is_gles3(ctx))
 113             goto invalid_enum_error;
 114          if (param<0) {
 115             _mesa_error( ctx, GL_INVALID_VALUE, "glPixelStore(param)" );
 116             return;
 117          }
 118          if (ctx->Pack.SkipImages == param)
 119             return;
 120          FLUSH_VERTICES(ctx, _NEW_PACKUNPACK);
 121          ctx->Pack.SkipImages = param;
 122          break;
 123       case GL_PACK_ALIGNMENT:
 124          if (param!=1 && param!=2 && param!=4 && param!=8) {
 125             _mesa_error( ctx, GL_INVALID_VALUE, "glPixelStore(param)" );
 126             return;
 127          }
 128          if (ctx->Pack.Alignment == param)
 129             return;
 130          FLUSH_VERTICES(ctx, _NEW_PACKUNPACK);
 131          ctx->Pack.Alignment = param;
 132          break;
 133       case GL_PACK_INVERT_MESA:
 134          if (!_mesa_is_desktop_gl(ctx))
 135             goto invalid_enum_error;
 136          if (!ctx->Extensions.MESA_pack_invert) {
 137             _mesa_error( ctx, GL_INVALID_ENUM, "glPixelstore(pname)" );
 138             return;
 139          }
 140          if (ctx->Pack.Invert == param)
 141             return;
 142          FLUSH_VERTICES(ctx, _NEW_PACKUNPACK);
 143          ctx->Pack.Invert = param;
 144          break;
 145
 146       case GL_UNPACK_SWAP_BYTES:
 147          if (!_mesa_is_desktop_gl(ctx))
 148             goto invalid_enum_error;
 149          if (param == (GLint)ctx->Unpack.SwapBytes)
 150             return;
 151          if ((GLint)ctx->Unpack.SwapBytes == param)
 152             return;
 153          FLUSH_VERTICES(ctx, _NEW_PACKUNPACK);
 154          ctx->Unpack.SwapBytes = param ? GL_TRUE : GL_FALSE;
 155          break;
 156       case GL_UNPACK_LSB_FIRST:
 157          if (!_mesa_is_desktop_gl(ctx))
 158             goto invalid_enum_error;
 159          if (param == (GLint)ctx->Unpack.LsbFirst)
 160             return;
 161          if ((GLint)ctx->Unpack.LsbFirst == param)
 162             return;
 163          FLUSH_VERTICES(ctx, _NEW_PACKUNPACK);
 164          ctx->Unpack.LsbFirst = param ? GL_TRUE : GL_FALSE;
 165          break;
 166       case GL_UNPACK_ROW_LENGTH:
 167          if (ctx->API == API_OPENGLES)
 168             goto invalid_enum_error;
 169          if (param<0) {
 170             _mesa_error( ctx, GL_INVALID_VALUE, "glPixelStore(param)" );
 171             return;
 172          }
 173          if (ctx->Unpack.RowLength == param)
 174             return;
 175          FLUSH_VERTICES(ctx, _NEW_PACKUNPACK);
 176          ctx->Unpack.RowLength = param;
 177          break;
 178       case GL_UNPACK_IMAGE_HEIGHT:
 179          if (!_mesa_is_desktop_gl(ctx) && !_mesa_is_gles3(ctx))
 180             goto invalid_enum_error;
 181          if (param<0) {
 182             _mesa_error( ctx, GL_INVALID_VALUE, "glPixelStore(param)" );
 183             return;
 184          }
 185          if (ctx->Unpack.ImageHeight == param)
 186             return;
 187
 188          FLUSH_VERTICES(ctx, _NEW_PACKUNPACK);
 189          ctx->Unpack.ImageHeight = param;
 190          break;
 191       case GL_UNPACK_SKIP_PIXELS:
 192          if (ctx->API == API_OPENGLES)
 193             goto invalid_enum_error;
 194          if (param<0) {
 195             _mesa_error( ctx, GL_INVALID_VALUE, "glPixelStore(param)" );
 196             return;
 197          }
 198          if (ctx->Unpack.SkipPixels == param)
 199             return;
 200          FLUSH_VERTICES(ctx, _NEW_PACKUNPACK);
 201          ctx->Unpack.SkipPixels = param;
 202          break;
 203       case GL_UNPACK_SKIP_ROWS:
 204          if (ctx->API == API_OPENGLES)
 205             goto invalid_enum_error;
 206          if (param<0) {
 207             _mesa_error( ctx, GL_INVALID_VALUE, "glPixelStore(param)" );
 208             return;
 209          }
 210          if (ctx->Unpack.SkipRows == param)
 211             return;
 212          FLUSH_VERTICES(ctx, _NEW_PACKUNPACK);
 213          ctx->Unpack.SkipRows = param;
 214          break;
 215       case GL_UNPACK_SKIP_IMAGES:
 216          if (!_mesa_is_desktop_gl(ctx) && !_mesa_is_gles3(ctx))
 217             goto invalid_enum_error;
 218          if (param < 0) {
 219             _mesa_error( ctx, GL_INVALID_VALUE, "glPixelStore(param)" );
 220             return;
 221          }
 222          if (ctx->Unpack.SkipImages == param)
 223             return;
 224          FLUSH_VERTICES(ctx, _NEW_PACKUNPACK);
 225          ctx->Unpack.SkipImages = param;
 226          break;
 227       case GL_UNPACK_ALIGNMENT:
 228          if (param!=1 && param!=2 && param!=4 && param!=8) {
 229             _mesa_error( ctx, GL_INVALID_VALUE, "glPixelStore" );
 230             return;
 231          }
 232          if (ctx->Unpack.Alignment == param)
 233             return;
 234          FLUSH_VERTICES(ctx, _NEW_PACKUNPACK);
 235          ctx->Unpack.Alignment = param;
 236          break;
 237       default:
 238          goto invalid_enum_error;
 239    }
 240
 241    return;
 242
 243 invalid_enum_error:
 244    _mesa_error( ctx, GL_INVALID_ENUM, "glPixelStore" );
 245    return;
 246 }
 247
 248
 249 void GLAPIENTRY
 250 _mesa_PixelStoref( GLenum pname, GLfloat param )
 251 {
 252    _mesa_PixelStorei( pname, IROUND(param) );
 253 }
 254
 255
 256
 257 /**
 258  * Initialize the context's pixel store state.
 259  */
 260 void
 261 _mesa_init_pixelstore( struct gl_context *ctx )
 262 {
 263    /* Pixel transfer */
 264    ctx->Pack.Alignment = 4;
 265    ctx->Pack.RowLength = 0;
 266    ctx->Pack.ImageHeight = 0;
 267    ctx->Pack.SkipPixels = 0;
 268    ctx->Pack.SkipRows = 0;
 269    ctx->Pack.SkipImages = 0;
 270    ctx->Pack.SwapBytes = GL_FALSE;
 271    ctx->Pack.LsbFirst = GL_FALSE;
 272    ctx->Pack.Invert = GL_FALSE;
 273 #if FEATURE_EXT_pixel_buffer_object
 274    _mesa_reference_buffer_object(ctx, &ctx->Pack.BufferObj,
 275                                  ctx->Shared->NullBufferObj);
 276 #endif
 277    ctx->Unpack.Alignment = 4;
 278    ctx->Unpack.RowLength = 0;
 279    ctx->Unpack.ImageHeight = 0;
 280    ctx->Unpack.SkipPixels = 0;
 281    ctx->Unpack.SkipRows = 0;
 282    ctx->Unpack.SkipImages = 0;
 283    ctx->Unpack.SwapBytes = GL_FALSE;
 284    ctx->Unpack.LsbFirst = GL_FALSE;
 285    ctx->Unpack.Invert = GL_FALSE;
 286 #if FEATURE_EXT_pixel_buffer_object
 287    _mesa_reference_buffer_object(ctx, &ctx->Unpack.BufferObj,
 288                                  ctx->Shared->NullBufferObj);
 289 #endif
 290
 291    /*
 292     * _mesa_unpack_image() returns image data in this format.  When we
 293     * execute image commands (glDrawPixels(), glTexImage(), etc) from
 294     * within display lists we have to be sure to set the current
 295     * unpacking parameters to these values!
 296     */
 297    ctx->DefaultPacking.Alignment = 1;
 298    ctx->DefaultPacking.RowLength = 0;
 299    ctx->DefaultPacking.SkipPixels = 0;
 300    ctx->DefaultPacking.SkipRows = 0;
 301    ctx->DefaultPacking.ImageHeight = 0;
 302    ctx->DefaultPacking.SkipImages = 0;
 303    ctx->DefaultPacking.SwapBytes = GL_FALSE;
 304    ctx->DefaultPacking.LsbFirst = GL_FALSE;
 305    ctx->DefaultPacking.Invert = GL_FALSE;
 306 #if FEATURE_EXT_pixel_buffer_object
 307    _mesa_reference_buffer_object(ctx, &ctx->DefaultPacking.BufferObj,
 308                                  ctx->Shared->NullBufferObj);
 309 #endif
 310 }