drawpix.c revision c80a380ebb58c15db87309d466ef57fb006b40ae 
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#include "glheader.h"
26#include "imports.h"
27#include "context.h"
28#include "drawpix.h"
29#include "feedback.h"
30#include "framebuffer.h"
31#include "image.h"
32#include "state.h"
33
34
35/**
36 * Do error checking of the format/type parameters to glReadPixels and
37 * glDrawPixels.
38 * \param drawing if GL_TRUE do checking for DrawPixels, else do checking
39 *                for ReadPixels.
40 * \return GL_TRUE if error detected, GL_FALSE if no errors
41 */
42static GLboolean
43error_check_format_type(GLcontext *ctx, GLenum format, GLenum type,
44                        GLboolean drawing)
45{
46   const char *readDraw = drawing ? "Draw" : "Read";
47
48   if (ctx->Extensions.EXT_packed_depth_stencil
49       && type == GL_UNSIGNED_INT_24_8_EXT
50       && format != GL_DEPTH_STENCIL_EXT) {
51      _mesa_error(ctx, GL_INVALID_OPERATION,
52                  "gl%sPixels(format is not GL_DEPTH_STENCIL_EXT)", readDraw);
53      return GL_TRUE;
54   }
55
56   /* basic combinations test */
57   if (!_mesa_is_legal_format_and_type(ctx, format, type)) {
58      _mesa_error(ctx, GL_INVALID_ENUM,
59                  "gl%sPixels(format or type)", readDraw);
60      return GL_TRUE;
61   }
62
63   /* additional checks */
64   switch (format) {
65   case GL_RED:
66   case GL_GREEN:
67   case GL_BLUE:
68   case GL_ALPHA:
69   case GL_LUMINANCE:
70   case GL_LUMINANCE_ALPHA:
71   case GL_RGB:
72   case GL_BGR:
73   case GL_RGBA:
74   case GL_BGRA:
75   case GL_ABGR_EXT:
76      if (drawing && !ctx->Visual.rgbMode) {
77         _mesa_error(ctx, GL_INVALID_OPERATION,
78                   "glDrawPixels(drawing RGB pixels into color index buffer)");
79         return GL_TRUE;
80      }
81      if (!drawing && !_mesa_dest_buffer_exists(ctx, GL_COLOR)) {
82         _mesa_error(ctx, GL_INVALID_OPERATION,
83                     "glReadPixels(no color buffer)");
84         return GL_TRUE;
85      }
86      break;
87   case GL_COLOR_INDEX:
88      if (!drawing && ctx->Visual.rgbMode) {
89         _mesa_error(ctx, GL_INVALID_OPERATION,
90                    "glReadPixels(reading color index format from RGB buffer)");
91         return GL_TRUE;
92      }
93      if (!drawing && !_mesa_dest_buffer_exists(ctx, GL_COLOR)) {
94         _mesa_error(ctx, GL_INVALID_OPERATION,
95                     "glReadPixels(no color buffer)");
96         return GL_TRUE;
97      }
98      break;
99   case GL_STENCIL_INDEX:
100      if ((drawing && !_mesa_dest_buffer_exists(ctx, format)) ||
101          (!drawing && !_mesa_source_buffer_exists(ctx, format))) {
102         _mesa_error(ctx, GL_INVALID_OPERATION,
103                     "gl%sPixels(no stencil buffer)", readDraw);
104         return GL_TRUE;
105      }
106      break;
107   case GL_DEPTH_COMPONENT:
108      if ((drawing && !_mesa_dest_buffer_exists(ctx, format)) ||
109          (!drawing && !_mesa_source_buffer_exists(ctx, format))) {
110         _mesa_error(ctx, GL_INVALID_OPERATION,
111                     "gl%sPixels(no depth buffer)", readDraw);
112         return GL_TRUE;
113      }
114      break;
115   case GL_DEPTH_STENCIL_EXT:
116      if (!ctx->Extensions.EXT_packed_depth_stencil ||
117          type != GL_UNSIGNED_INT_24_8_EXT) {
118         _mesa_error(ctx, GL_INVALID_ENUM, "gl%sPixels(type)", readDraw);
119         return GL_TRUE;
120      }
121      if ((drawing && !_mesa_dest_buffer_exists(ctx, format)) ||
122          (!drawing && !_mesa_source_buffer_exists(ctx, format))) {
123         _mesa_error(ctx, GL_INVALID_OPERATION,
124                     "gl%sPixels(no depth or stencil buffer)", readDraw);
125         return GL_TRUE;
126      }
127      break;
128   default:
129      /* this should have been caught in _mesa_is_legal_format_type() */
130      _mesa_problem(ctx, "unexpected format in _mesa_%sPixels", readDraw);
131      return GL_TRUE;
132   }
133
134   /* no errors */
135   return GL_FALSE;
136}
137
138
139
140#if _HAVE_FULL_GL
141
142/*
143 * Execute glDrawPixels
144 */
145void GLAPIENTRY
146_mesa_DrawPixels( GLsizei width, GLsizei height,
147                  GLenum format, GLenum type, const GLvoid *pixels )
148{
149   GET_CURRENT_CONTEXT(ctx);
150   ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
151
152   if (width < 0 || height < 0) {
153      _mesa_error( ctx, GL_INVALID_VALUE, "glDrawPixels(width or height < 0" );
154      return;
155   }
156
157   if (ctx->NewState) {
158      _mesa_update_state(ctx);
159   }
160
161   if (ctx->FragmentProgram.Enabled && !ctx->FragmentProgram._Enabled) {
162      _mesa_error(ctx, GL_INVALID_OPERATION,
163                  "glDrawPixels (invalid fragment program)");
164      return;
165   }
166
167   if (error_check_format_type(ctx, format, type, GL_TRUE)) {
168      /* found an error */
169      return;
170   }
171
172   if (ctx->DrawBuffer->_Status != GL_FRAMEBUFFER_COMPLETE_EXT) {
173      _mesa_error(ctx, GL_INVALID_FRAMEBUFFER_OPERATION_EXT,
174                  "glDrawPixels(incomplete framebuffer)" );
175      return;
176   }
177
178   if (!ctx->Current.RasterPosValid) {
179      return;
180   }
181
182   if (ctx->RenderMode == GL_RENDER) {
183      /* Round, to satisfy conformance tests (matches SGI's OpenGL) */
184      GLint x = IROUND(ctx->Current.RasterPos[0]);
185      GLint y = IROUND(ctx->Current.RasterPos[1]);
186      ctx->Driver.DrawPixels(ctx, x, y, width, height, format, type,
187			     &ctx->Unpack, pixels);
188   }
189   else if (ctx->RenderMode == GL_FEEDBACK) {
190      /* Feedback the current raster pos info */
191      FLUSH_CURRENT( ctx, 0 );
192      FEEDBACK_TOKEN( ctx, (GLfloat) (GLint) GL_DRAW_PIXEL_TOKEN );
193      _mesa_feedback_vertex( ctx,
194                             ctx->Current.RasterPos,
195                             ctx->Current.RasterColor,
196                             ctx->Current.RasterIndex,
197                             ctx->Current.RasterTexCoords[0] );
198   }
199   else {
200      ASSERT(ctx->RenderMode == GL_SELECT);
201      /* Do nothing.  See OpenGL Spec, Appendix B, Corollary 6. */
202   }
203}
204
205
206void GLAPIENTRY
207_mesa_CopyPixels( GLint srcx, GLint srcy, GLsizei width, GLsizei height,
208                  GLenum type )
209{
210   GET_CURRENT_CONTEXT(ctx);
211   ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
212
213   if (ctx->NewState) {
214      _mesa_update_state(ctx);
215   }
216
217   if (ctx->FragmentProgram.Enabled && !ctx->FragmentProgram._Enabled) {
218      _mesa_error(ctx, GL_INVALID_OPERATION,
219                  "glCopyPixels (invalid fragment program)");
220      return;
221   }
222
223   if (width < 0 || height < 0) {
224      _mesa_error(ctx, GL_INVALID_VALUE, "glCopyPixels(width or height < 0)");
225      return;
226   }
227
228   if (ctx->DrawBuffer->_Status != GL_FRAMEBUFFER_COMPLETE_EXT ||
229       ctx->ReadBuffer->_Status != GL_FRAMEBUFFER_COMPLETE_EXT) {
230      _mesa_error(ctx, GL_INVALID_FRAMEBUFFER_OPERATION_EXT,
231                  "glCopyPixels(incomplete framebuffer)" );
232      return;
233   }
234
235   if (!_mesa_source_buffer_exists(ctx, type) ||
236       !_mesa_dest_buffer_exists(ctx, type)) {
237      _mesa_error(ctx, GL_INVALID_OPERATION,
238                  "glCopyPixels(missing source or dest buffer)");
239      return;
240   }
241
242   if (!ctx->Current.RasterPosValid || width ==0 || height == 0) {
243      return;
244   }
245
246   if (ctx->RenderMode == GL_RENDER) {
247      /* Round to satisfy conformance tests (matches SGI's OpenGL) */
248      GLint destx = IROUND(ctx->Current.RasterPos[0]);
249      GLint desty = IROUND(ctx->Current.RasterPos[1]);
250      ctx->Driver.CopyPixels( ctx, srcx, srcy, width, height, destx, desty,
251			      type );
252   }
253   else if (ctx->RenderMode == GL_FEEDBACK) {
254      FLUSH_CURRENT( ctx, 0 );
255      FEEDBACK_TOKEN( ctx, (GLfloat) (GLint) GL_COPY_PIXEL_TOKEN );
256      _mesa_feedback_vertex( ctx,
257                             ctx->Current.RasterPos,
258                             ctx->Current.RasterColor,
259                             ctx->Current.RasterIndex,
260                             ctx->Current.RasterTexCoords[0] );
261   }
262   else {
263      ASSERT(ctx->RenderMode == GL_SELECT);
264      /* Do nothing.  See OpenGL Spec, Appendix B, Corollary 6. */
265   }
266}
267
268#endif /* _HAVE_FULL_GL */
269
270
271
272void GLAPIENTRY
273_mesa_ReadPixels( GLint x, GLint y, GLsizei width, GLsizei height,
274		  GLenum format, GLenum type, GLvoid *pixels )
275{
276   GET_CURRENT_CONTEXT(ctx);
277   ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
278
279   FLUSH_CURRENT(ctx, 0);
280
281   if (width < 0 || height < 0) {
282      _mesa_error( ctx, GL_INVALID_VALUE,
283                   "glReadPixels(width=%d height=%d)", width, height );
284      return;
285   }
286
287   if (ctx->NewState)
288      _mesa_update_state(ctx);
289
290   if (error_check_format_type(ctx, format, type, GL_FALSE)) {
291      /* found an error */
292      return;
293   }
294
295   if (ctx->ReadBuffer->_Status != GL_FRAMEBUFFER_COMPLETE_EXT) {
296      _mesa_error(ctx, GL_INVALID_FRAMEBUFFER_OPERATION_EXT,
297                  "glReadPixels(incomplete framebuffer)" );
298      return;
299   }
300
301   if (!_mesa_source_buffer_exists(ctx, format)) {
302      _mesa_error(ctx, GL_INVALID_OPERATION, "glReadPixels(no readbuffer)");
303      return;
304   }
305
306   ctx->Driver.ReadPixels(ctx, x, y, width, height,
307			  format, type, &ctx->Pack, pixels);
308}
309
310
311
312void GLAPIENTRY
313_mesa_Bitmap( GLsizei width, GLsizei height,
314              GLfloat xorig, GLfloat yorig, GLfloat xmove, GLfloat ymove,
315              const GLubyte *bitmap )
316{
317   GET_CURRENT_CONTEXT(ctx);
318   ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
319
320   if (width < 0 || height < 0) {
321      _mesa_error( ctx, GL_INVALID_VALUE, "glBitmap(width or height < 0)" );
322      return;
323   }
324
325   if (!ctx->Current.RasterPosValid) {
326      return;    /* do nothing */
327   }
328
329   if (ctx->NewState) {
330      _mesa_update_state(ctx);
331   }
332
333   if (ctx->FragmentProgram.Enabled && !ctx->FragmentProgram._Enabled) {
334      _mesa_error(ctx, GL_INVALID_OPERATION,
335                  "glBitmap (invalid fragment program)");
336      return;
337   }
338
339   if (ctx->DrawBuffer->_Status != GL_FRAMEBUFFER_COMPLETE_EXT) {
340      _mesa_error(ctx, GL_INVALID_FRAMEBUFFER_OPERATION_EXT,
341                  "glBitmap(incomplete framebuffer)");
342      return;
343   }
344
345   if (ctx->RenderMode == GL_RENDER) {
346      /* Truncate, to satisfy conformance tests (matches SGI's OpenGL). */
347      GLint x = IFLOOR(ctx->Current.RasterPos[0] - xorig);
348      GLint y = IFLOOR(ctx->Current.RasterPos[1] - yorig);
349      ctx->Driver.Bitmap( ctx, x, y, width, height, &ctx->Unpack, bitmap );
350   }
351#if _HAVE_FULL_GL
352   else if (ctx->RenderMode == GL_FEEDBACK) {
353      FLUSH_CURRENT(ctx, 0);
354      FEEDBACK_TOKEN( ctx, (GLfloat) (GLint) GL_BITMAP_TOKEN );
355      _mesa_feedback_vertex( ctx,
356                             ctx->Current.RasterPos,
357                             ctx->Current.RasterColor,
358                             ctx->Current.RasterIndex,
359                             ctx->Current.RasterTexCoords[0] );
360   }
361   else {
362      ASSERT(ctx->RenderMode == GL_SELECT);
363      /* Do nothing.  See OpenGL Spec, Appendix B, Corollary 6. */
364   }
365#endif
366
367   /* update raster position */
368   ctx->Current.RasterPos[0] += xmove;
369   ctx->Current.RasterPos[1] += ymove;
370}
371
372
373
374#if 0  /* experimental */
375/*
376 * Execute glDrawDepthPixelsMESA().  This function accepts both a color
377 * image and depth (Z) image.  Rasterization produces fragments with
378 * color and Z taken from these images.  This function is intended for
379 * Z-compositing.  Normally, this operation requires two glDrawPixels
380 * calls with stencil testing.
381 */
382void GLAPIENTRY
383_mesa_DrawDepthPixelsMESA( GLsizei width, GLsizei height,
384                           GLenum colorFormat, GLenum colorType,
385                           const GLvoid *colors,
386                           GLenum depthType, const GLvoid *depths )
387{
388   GET_CURRENT_CONTEXT(ctx);
389   ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
390
391   if (width < 0 || height < 0) {
392      _mesa_error( ctx, GL_INVALID_VALUE,
393                   "glDrawDepthPixelsMESA(width or height < 0" );
394      return;
395   }
396
397   if (!ctx->Current.RasterPosValid) {
398      return;
399   }
400
401   if (ctx->NewState) {
402      _mesa_update_state(ctx);
403   }
404
405   if (ctx->DrawBuffer->_Status != GL_FRAMEBUFFER_COMPLETE_EXT) {
406      _mesa_error(ctx, GL_INVALID_FRAMEBUFFER_OPERATION_EXT,
407                  "glDrawDepthPixelsMESA(incomplete framebuffer)");
408      return;
409   }
410
411   if (ctx->RenderMode == GL_RENDER) {
412      /* Round, to satisfy conformance tests (matches SGI's OpenGL) */
413      GLint x = IROUND(ctx->Current.RasterPos[0]);
414      GLint y = IROUND(ctx->Current.RasterPos[1]);
415      ctx->Driver.DrawDepthPixelsMESA(ctx, x, y, width, height,
416                                      colorFormat, colorType, colors,
417                                      depthType, depths, &ctx->Unpack);
418   }
419   else if (ctx->RenderMode == GL_FEEDBACK) {
420      /* Feedback the current raster pos info */
421      FLUSH_CURRENT( ctx, 0 );
422      FEEDBACK_TOKEN( ctx, (GLfloat) (GLint) GL_DRAW_PIXEL_TOKEN );
423      _mesa_feedback_vertex( ctx,
424                             ctx->Current.RasterPos,
425                             ctx->Current.RasterColor,
426                             ctx->Current.RasterIndex,
427                             ctx->Current.RasterTexCoords[0] );
428   }
429   else {
430      ASSERT(ctx->RenderMode == GL_SELECT);
431      /* Do nothing.  See OpenGL Spec, Appendix B, Corollary 6. */
432   }
433}
434
435#endif
436