pixelstore.c revision 848b8605 
1/*
2 * Mesa 3-D graphics library
3 *
4 * Copyright (C) 1999-2008  Brian Paul   All Rights Reserved.
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a
7 * copy of this software and associated documentation files (the "Software"),
8 * to deal in the Software without restriction, including without limitation
9 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
10 * and/or sell copies of the Software, and to permit persons to whom the
11 * Software is furnished to do so, subject to the following conditions:
12 *
13 * The above copyright notice and this permission notice shall be included
14 * in all copies or substantial portions of the Software.
15 *
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
17 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
20 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
21 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
22 * 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
38void 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
44   switch (pname) {
45      case GL_PACK_SWAP_BYTES:
46         if (!_mesa_is_desktop_gl(ctx))
47            goto invalid_enum_error;
48         ctx->Pack.SwapBytes = param ? GL_TRUE : GL_FALSE;
49         break;
50      case GL_PACK_LSB_FIRST:
51         if (!_mesa_is_desktop_gl(ctx))
52            goto invalid_enum_error;
53         ctx->Pack.LsbFirst = param ? GL_TRUE : GL_FALSE;
54         break;
55      case GL_PACK_ROW_LENGTH:
56         if (!_mesa_is_desktop_gl(ctx) && !_mesa_is_gles3(ctx))
57            goto invalid_enum_error;
58         if (param<0)
59            goto invalid_value_error;
60         ctx->Pack.RowLength = param;
61         break;
62      case GL_PACK_IMAGE_HEIGHT:
63         if (!_mesa_is_desktop_gl(ctx) && !_mesa_is_gles3(ctx))
64            goto invalid_enum_error;
65         if (param<0)
66            goto invalid_value_error;
67         ctx->Pack.ImageHeight = param;
68         break;
69      case GL_PACK_SKIP_PIXELS:
70         if (!_mesa_is_desktop_gl(ctx) && !_mesa_is_gles3(ctx))
71            goto invalid_enum_error;
72         if (param<0)
73            goto invalid_value_error;
74         ctx->Pack.SkipPixels = param;
75         break;
76      case GL_PACK_SKIP_ROWS:
77         if (!_mesa_is_desktop_gl(ctx) && !_mesa_is_gles3(ctx))
78            goto invalid_enum_error;
79         if (param<0)
80            goto invalid_value_error;
81         ctx->Pack.SkipRows = param;
82         break;
83      case GL_PACK_SKIP_IMAGES:
84         if (!_mesa_is_desktop_gl(ctx) && !_mesa_is_gles3(ctx))
85            goto invalid_enum_error;
86         if (param<0)
87            goto invalid_value_error;
88         ctx->Pack.SkipImages = param;
89         break;
90      case GL_PACK_ALIGNMENT:
91         if (param!=1 && param!=2 && param!=4 && param!=8)
92            goto invalid_value_error;
93         ctx->Pack.Alignment = param;
94         break;
95      case GL_PACK_INVERT_MESA:
96         if (!_mesa_is_desktop_gl(ctx) || !ctx->Extensions.MESA_pack_invert)
97            goto invalid_enum_error;
98         ctx->Pack.Invert = param;
99         break;
100      case GL_PACK_COMPRESSED_BLOCK_WIDTH:
101         if (!_mesa_is_desktop_gl(ctx))
102            goto invalid_enum_error;
103         if (param<0)
104            goto invalid_value_error;
105         ctx->Pack.CompressedBlockWidth = param;
106         break;
107      case GL_PACK_COMPRESSED_BLOCK_HEIGHT:
108         if (!_mesa_is_desktop_gl(ctx))
109            goto invalid_enum_error;
110         if (param<0)
111            goto invalid_value_error;
112         ctx->Pack.CompressedBlockHeight = param;
113         break;
114      case GL_PACK_COMPRESSED_BLOCK_DEPTH:
115         if (!_mesa_is_desktop_gl(ctx))
116            goto invalid_enum_error;
117         if (param<0)
118            goto invalid_value_error;
119         ctx->Pack.CompressedBlockDepth = param;
120         break;
121      case GL_PACK_COMPRESSED_BLOCK_SIZE:
122         if (!_mesa_is_desktop_gl(ctx))
123            goto invalid_enum_error;
124         if (param<0)
125            goto invalid_value_error;
126         ctx->Pack.CompressedBlockSize = param;
127         break;
128
129      case GL_UNPACK_SWAP_BYTES:
130         if (!_mesa_is_desktop_gl(ctx))
131            goto invalid_enum_error;
132         ctx->Unpack.SwapBytes = param ? GL_TRUE : GL_FALSE;
133         break;
134      case GL_UNPACK_LSB_FIRST:
135         if (!_mesa_is_desktop_gl(ctx))
136            goto invalid_enum_error;
137         ctx->Unpack.LsbFirst = param ? GL_TRUE : GL_FALSE;
138         break;
139      case GL_UNPACK_ROW_LENGTH:
140         if (ctx->API == API_OPENGLES)
141            goto invalid_enum_error;
142         if (param<0)
143            goto invalid_value_error;
144         ctx->Unpack.RowLength = param;
145         break;
146      case GL_UNPACK_IMAGE_HEIGHT:
147         if (!_mesa_is_desktop_gl(ctx) && !_mesa_is_gles3(ctx))
148            goto invalid_enum_error;
149         if (param<0)
150            goto invalid_value_error;
151         ctx->Unpack.ImageHeight = param;
152         break;
153      case GL_UNPACK_SKIP_PIXELS:
154         if (ctx->API == API_OPENGLES)
155            goto invalid_enum_error;
156         if (param<0)
157            goto invalid_value_error;
158         ctx->Unpack.SkipPixels = param;
159         break;
160      case GL_UNPACK_SKIP_ROWS:
161         if (ctx->API == API_OPENGLES)
162            goto invalid_enum_error;
163         if (param<0)
164            goto invalid_value_error;
165         ctx->Unpack.SkipRows = param;
166         break;
167      case GL_UNPACK_SKIP_IMAGES:
168         if (!_mesa_is_desktop_gl(ctx) && !_mesa_is_gles3(ctx))
169            goto invalid_enum_error;
170         if (param < 0)
171            goto invalid_value_error;
172         ctx->Unpack.SkipImages = param;
173         break;
174      case GL_UNPACK_ALIGNMENT:
175         if (param!=1 && param!=2 && param!=4 && param!=8)
176            goto invalid_value_error;
177         ctx->Unpack.Alignment = param;
178         break;
179      case GL_UNPACK_COMPRESSED_BLOCK_WIDTH:
180         if (!_mesa_is_desktop_gl(ctx))
181            goto invalid_enum_error;
182         if (param<0)
183            goto invalid_value_error;
184         ctx->Unpack.CompressedBlockWidth = param;
185         break;
186      case GL_UNPACK_COMPRESSED_BLOCK_HEIGHT:
187         if (!_mesa_is_desktop_gl(ctx))
188            goto invalid_enum_error;
189         if (param<0)
190            goto invalid_value_error;
191         ctx->Unpack.CompressedBlockHeight = param;
192         break;
193      case GL_UNPACK_COMPRESSED_BLOCK_DEPTH:
194         if (!_mesa_is_desktop_gl(ctx))
195            goto invalid_enum_error;
196         if (param<0)
197            goto invalid_value_error;
198         ctx->Unpack.CompressedBlockDepth = param;
199         break;
200      case GL_UNPACK_COMPRESSED_BLOCK_SIZE:
201         if (!_mesa_is_desktop_gl(ctx))
202            goto invalid_enum_error;
203         if (param<0)
204            goto invalid_value_error;
205         ctx->Unpack.CompressedBlockSize = param;
206         break;
207      default:
208         goto invalid_enum_error;
209   }
210
211   return;
212
213invalid_enum_error:
214   _mesa_error( ctx, GL_INVALID_ENUM, "glPixelStore" );
215   return;
216
217invalid_value_error:
218   _mesa_error( ctx, GL_INVALID_VALUE, "glPixelStore(param)" );
219   return;
220}
221
222
223void GLAPIENTRY
224_mesa_PixelStoref( GLenum pname, GLfloat param )
225{
226   _mesa_PixelStorei( pname, IROUND(param) );
227}
228
229
230
231/**
232 * Initialize the context's pixel store state.
233 */
234void
235_mesa_init_pixelstore( struct gl_context *ctx )
236{
237   /* Pixel transfer */
238   ctx->Pack.Alignment = 4;
239   ctx->Pack.RowLength = 0;
240   ctx->Pack.ImageHeight = 0;
241   ctx->Pack.SkipPixels = 0;
242   ctx->Pack.SkipRows = 0;
243   ctx->Pack.SkipImages = 0;
244   ctx->Pack.SwapBytes = GL_FALSE;
245   ctx->Pack.LsbFirst = GL_FALSE;
246   ctx->Pack.Invert = GL_FALSE;
247   ctx->Pack.CompressedBlockWidth = 0;
248   ctx->Pack.CompressedBlockHeight = 0;
249   ctx->Pack.CompressedBlockDepth = 0;
250   ctx->Pack.CompressedBlockSize = 0;
251   _mesa_reference_buffer_object(ctx, &ctx->Pack.BufferObj,
252                                 ctx->Shared->NullBufferObj);
253   ctx->Unpack.Alignment = 4;
254   ctx->Unpack.RowLength = 0;
255   ctx->Unpack.ImageHeight = 0;
256   ctx->Unpack.SkipPixels = 0;
257   ctx->Unpack.SkipRows = 0;
258   ctx->Unpack.SkipImages = 0;
259   ctx->Unpack.SwapBytes = GL_FALSE;
260   ctx->Unpack.LsbFirst = GL_FALSE;
261   ctx->Unpack.Invert = GL_FALSE;
262   ctx->Unpack.CompressedBlockWidth = 0;
263   ctx->Unpack.CompressedBlockHeight = 0;
264   ctx->Unpack.CompressedBlockDepth = 0;
265   ctx->Unpack.CompressedBlockSize = 0;
266   _mesa_reference_buffer_object(ctx, &ctx->Unpack.BufferObj,
267                                 ctx->Shared->NullBufferObj);
268
269   /*
270    * _mesa_unpack_image() returns image data in this format.  When we
271    * execute image commands (glDrawPixels(), glTexImage(), etc) from
272    * within display lists we have to be sure to set the current
273    * unpacking parameters to these values!
274    */
275   ctx->DefaultPacking.Alignment = 1;
276   ctx->DefaultPacking.RowLength = 0;
277   ctx->DefaultPacking.SkipPixels = 0;
278   ctx->DefaultPacking.SkipRows = 0;
279   ctx->DefaultPacking.ImageHeight = 0;
280   ctx->DefaultPacking.SkipImages = 0;
281   ctx->DefaultPacking.SwapBytes = GL_FALSE;
282   ctx->DefaultPacking.LsbFirst = GL_FALSE;
283   ctx->DefaultPacking.Invert = GL_FALSE;
284   _mesa_reference_buffer_object(ctx, &ctx->DefaultPacking.BufferObj,
285                                 ctx->Shared->NullBufferObj);
286}
287
288
289/**
290 * Check if the given compressed pixel storage parameters are legal.
291 * Record a GL error if illegal.
292 * \return  true if legal, false if illegal
293 */
294bool
295_mesa_compressed_pixel_storage_error_check(
296   struct gl_context *ctx,
297   GLint dimensions,
298   const struct gl_pixelstore_attrib *packing,
299   const char *caller)
300{
301   if (!_mesa_is_desktop_gl(ctx) || !packing->CompressedBlockSize)
302      return true;
303
304   if (packing->CompressedBlockWidth &&
305       packing->SkipPixels % packing->CompressedBlockWidth) {
306      _mesa_error(ctx, GL_INVALID_OPERATION,
307                  "%s(skip-pixels %% block-width)", caller);
308      return false;
309   }
310
311   if (dimensions > 1 &&
312       packing->CompressedBlockHeight &&
313       packing->SkipRows % packing->CompressedBlockHeight) {
314      _mesa_error(ctx, GL_INVALID_OPERATION,
315                  "%s(skip-rows %% block-height)", caller);
316      return false;
317   }
318
319   if (dimensions > 2 &&
320       packing->CompressedBlockDepth &&
321       packing->SkipImages % packing->CompressedBlockDepth) {
322      _mesa_error(ctx, GL_INVALID_OPERATION,
323                  "%s(skip-images %% block-depth)", caller);
324      return false;
325   }
326
327   return true;
328}
329