drawpix.c revision 99796464c5f0fdb463c31a0e99b0896089b8bd80 
1/*
2 * Mesa 3-D graphics library
3 * Version:  6.5
4 *
5 * Copyright (C) 1999-2005  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 "image.h"
31#include "state.h"
32
33
34/**
35 * Do error checking of the format/type parameters to glReadPixels and
36 * glDrawPixels.
37 * \param drawing if GL_TRUE do checking for DrawPixels, else do checking
38 *                for ReadPixels.
39 * \return GL_TRUE if error detected, GL_FALSE if no errors
40 */
41static GLboolean
42error_check_format_type(GLcontext *ctx, GLenum format, GLenum type,
43                        GLboolean drawing)
44{
45   const char *readDraw = drawing ? "Draw" : "Read";
46
47   /* basic combinations test */
48   if (!_mesa_is_legal_format_and_type(ctx, format, type)) {
49      _mesa_error(ctx, GL_INVALID_ENUM,
50                  "gl%sPixels(format or type)", readDraw);
51      return GL_TRUE;
52   }
53
54   /* additional checks */
55   switch (format) {
56   case GL_RED:
57   case GL_GREEN:
58   case GL_BLUE:
59   case GL_ALPHA:
60   case GL_LUMINANCE:
61   case GL_LUMINANCE_ALPHA:
62   case GL_RGB:
63   case GL_BGR:
64   case GL_RGBA:
65   case GL_BGRA:
66   case GL_ABGR_EXT:
67      if (drawing && !ctx->Visual.rgbMode) {
68         _mesa_error(ctx, GL_INVALID_OPERATION,
69                   "glDrawPixels(drawing RGB pixels into color index buffer)");
70         return GL_TRUE;
71      }
72      break;
73   case GL_COLOR_INDEX:
74      if (!drawing && ctx->Visual.rgbMode) {
75         _mesa_error(ctx, GL_INVALID_OPERATION,
76                    "glReadPixels(reading color index format from RGB buffer");
77         return GL_TRUE;
78      }
79      break;
80   case GL_STENCIL_INDEX:
81      if (ctx->DrawBuffer->Visual.stencilBits == 0) {
82         _mesa_error(ctx, GL_INVALID_OPERATION,
83                     "gl%sPixels(no stencil buffer)", readDraw);
84         return GL_TRUE;
85      }
86      break;
87   case GL_DEPTH_COMPONENT:
88      if (ctx->DrawBuffer->Visual.depthBits == 0) {
89         _mesa_error(ctx, GL_INVALID_OPERATION,
90                     "gl%sPixels(no depth buffer)", readDraw);
91         return GL_TRUE;
92      }
93      break;
94   default:
95      /* this should have been caught in _mesa_is_legal_format_type() */
96      _mesa_problem(ctx, "unexpected format in _mesa_%sPixels", readDraw);
97      return GL_TRUE;
98   }
99
100   /* no errors */
101   return GL_FALSE;
102}
103
104
105
106#if _HAVE_FULL_GL
107
108/*
109 * Execute glDrawPixels
110 */
111void GLAPIENTRY
112_mesa_DrawPixels( GLsizei width, GLsizei height,
113                  GLenum format, GLenum type, const GLvoid *pixels )
114{
115   GET_CURRENT_CONTEXT(ctx);
116   ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
117
118   if (ctx->FragmentProgram.Enabled && !ctx->FragmentProgram._Enabled) {
119      _mesa_error(ctx, GL_INVALID_OPERATION,
120                  "glDrawPixels (invalid fragment program)");
121      return;
122   }
123
124   if (width < 0 || height < 0) {
125      _mesa_error( ctx, GL_INVALID_VALUE, "glDrawPixels(width or height < 0" );
126      return;
127   }
128
129   if (error_check_format_type(ctx, format, type, GL_TRUE)) {
130      /* found an error */
131      return;
132   }
133
134   if (!ctx->Current.RasterPosValid) {
135      return; /* not an error */
136   }
137
138   if (ctx->NewState) {
139      _mesa_update_state(ctx);
140   }
141
142   if (ctx->RenderMode == GL_RENDER) {
143      /* Round, to satisfy conformance tests (matches SGI's OpenGL) */
144      GLint x = IROUND(ctx->Current.RasterPos[0]);
145      GLint y = IROUND(ctx->Current.RasterPos[1]);
146      ctx->Driver.DrawPixels(ctx, x, y, width, height, format, type,
147			     &ctx->Unpack, pixels);
148   }
149   else if (ctx->RenderMode == GL_FEEDBACK) {
150      /* Feedback the current raster pos info */
151      FLUSH_CURRENT( ctx, 0 );
152      FEEDBACK_TOKEN( ctx, (GLfloat) (GLint) GL_DRAW_PIXEL_TOKEN );
153      _mesa_feedback_vertex( ctx,
154                             ctx->Current.RasterPos,
155                             ctx->Current.RasterColor,
156                             ctx->Current.RasterIndex,
157                             ctx->Current.RasterTexCoords[0] );
158   }
159   else {
160      ASSERT(ctx->RenderMode == GL_SELECT);
161      /* Do nothing.  See OpenGL Spec, Appendix B, Corollary 6. */
162   }
163}
164
165
166void GLAPIENTRY
167_mesa_CopyPixels( GLint srcx, GLint srcy, GLsizei width, GLsizei height,
168                  GLenum type )
169{
170   GET_CURRENT_CONTEXT(ctx);
171   ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
172
173   if (ctx->FragmentProgram.Enabled && !ctx->FragmentProgram._Enabled) {
174      _mesa_error(ctx, GL_INVALID_OPERATION,
175                  "glCopyPixels (invalid fragment program)");
176      return;
177   }
178
179   if (width < 0 || height < 0) {
180      _mesa_error(ctx, GL_INVALID_VALUE, "glCopyPixels(width or height < 0)");
181      return;
182   }
183
184   switch (type) {
185   case GL_COLOR:
186      /* OK */
187      break;
188   case GL_DEPTH:
189      if (ctx->DrawBuffer->Visual.depthBits == 0 ||
190          ctx->ReadBuffer->Visual.depthBits == 0) {
191         _mesa_error(ctx, GL_INVALID_OPERATION,
192                     "glCopyPixels(no depth buffer)");
193         return;
194      }
195      break;
196   case GL_STENCIL:
197      if (ctx->DrawBuffer->Visual.stencilBits == 0 ||
198          ctx->ReadBuffer->Visual.stencilBits == 0) {
199         _mesa_error(ctx, GL_INVALID_OPERATION,
200                     "glCopyPixels(no stencil buffer)");
201         return;
202      }
203      break;
204   default:
205      _mesa_error(ctx, GL_INVALID_ENUM, "glCopyPixels");
206      return;
207   }
208
209   if (ctx->NewState) {
210      _mesa_update_state(ctx);
211   }
212
213   if (!ctx->Current.RasterPosValid) {
214      return;
215   }
216
217   if (ctx->RenderMode == GL_RENDER) {
218      /* Round to satisfy conformance tests (matches SGI's OpenGL) */
219      GLint destx = IROUND(ctx->Current.RasterPos[0]);
220      GLint desty = IROUND(ctx->Current.RasterPos[1]);
221      ctx->Driver.CopyPixels( ctx, srcx, srcy, width, height, destx, desty,
222			      type );
223   }
224   else if (ctx->RenderMode == GL_FEEDBACK) {
225      FLUSH_CURRENT( ctx, 0 );
226      FEEDBACK_TOKEN( ctx, (GLfloat) (GLint) GL_COPY_PIXEL_TOKEN );
227      _mesa_feedback_vertex( ctx,
228                             ctx->Current.RasterPos,
229                             ctx->Current.RasterColor,
230                             ctx->Current.RasterIndex,
231                             ctx->Current.RasterTexCoords[0] );
232   }
233   else {
234      ASSERT(ctx->RenderMode == GL_SELECT);
235      /* Do nothing.  See OpenGL Spec, Appendix B, Corollary 6. */
236   }
237}
238
239#endif /* _HAVE_FULL_GL */
240
241
242
243void GLAPIENTRY
244_mesa_ReadPixels( GLint x, GLint y, GLsizei width, GLsizei height,
245		  GLenum format, GLenum type, GLvoid *pixels )
246{
247   GET_CURRENT_CONTEXT(ctx);
248   ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
249
250   if (width < 0 || height < 0) {
251      _mesa_error( ctx, GL_INVALID_VALUE,
252                   "glReadPixels(width=%d height=%d)", width, height );
253      return;
254   }
255
256   if (error_check_format_type(ctx, format, type, GL_FALSE)) {
257      /* found an error */
258      return;
259   }
260
261   if (ctx->NewState)
262      _mesa_update_state(ctx);
263
264   ctx->Driver.ReadPixels(ctx, x, y, width, height,
265			  format, type, &ctx->Pack, pixels);
266}
267
268
269
270void GLAPIENTRY
271_mesa_Bitmap( GLsizei width, GLsizei height,
272              GLfloat xorig, GLfloat yorig, GLfloat xmove, GLfloat ymove,
273              const GLubyte *bitmap )
274{
275   GET_CURRENT_CONTEXT(ctx);
276   ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
277
278   if (ctx->FragmentProgram.Enabled && !ctx->FragmentProgram._Enabled) {
279      _mesa_error(ctx, GL_INVALID_OPERATION,
280                  "glBitmap (invalid fragment program)");
281      return;
282   }
283
284   if (width < 0 || height < 0) {
285      _mesa_error( ctx, GL_INVALID_VALUE, "glBitmap(width or height < 0)" );
286      return;
287   }
288
289   if (!ctx->Current.RasterPosValid) {
290      return;    /* do nothing */
291   }
292
293   if (ctx->NewState) {
294      _mesa_update_state(ctx);
295   }
296
297   if (ctx->RenderMode == GL_RENDER) {
298      /* Truncate, to satisfy conformance tests (matches SGI's OpenGL). */
299      GLint x = IFLOOR(ctx->Current.RasterPos[0] - xorig);
300      GLint y = IFLOOR(ctx->Current.RasterPos[1] - yorig);
301      ctx->Driver.Bitmap( ctx, x, y, width, height, &ctx->Unpack, bitmap );
302   }
303#if _HAVE_FULL_GL
304   else if (ctx->RenderMode == GL_FEEDBACK) {
305      FLUSH_CURRENT(ctx, 0);
306      FEEDBACK_TOKEN( ctx, (GLfloat) (GLint) GL_BITMAP_TOKEN );
307      _mesa_feedback_vertex( ctx,
308                             ctx->Current.RasterPos,
309                             ctx->Current.RasterColor,
310                             ctx->Current.RasterIndex,
311                             ctx->Current.RasterTexCoords[0] );
312   }
313   else {
314      ASSERT(ctx->RenderMode == GL_SELECT);
315      /* Do nothing.  See OpenGL Spec, Appendix B, Corollary 6. */
316   }
317#endif
318
319   /* update raster position */
320   ctx->Current.RasterPos[0] += xmove;
321   ctx->Current.RasterPos[1] += ymove;
322}
323
324
325
326#if 0  /* experimental */
327/*
328 * Execute glDrawDepthPixelsMESA().  This function accepts both a color
329 * image and depth (Z) image.  Rasterization produces fragments with
330 * color and Z taken from these images.  This function is intended for
331 * Z-compositing.  Normally, this operation requires two glDrawPixels
332 * calls with stencil testing.
333 */
334void GLAPIENTRY
335_mesa_DrawDepthPixelsMESA( GLsizei width, GLsizei height,
336                           GLenum colorFormat, GLenum colorType,
337                           const GLvoid *colors,
338                           GLenum depthType, const GLvoid *depths )
339{
340   GET_CURRENT_CONTEXT(ctx);
341   ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
342
343   if (width < 0 || height < 0) {
344      _mesa_error( ctx, GL_INVALID_VALUE,
345                   "glDrawDepthPixelsMESA(width or height < 0" );
346      return;
347   }
348
349   if (!ctx->Current.RasterPosValid) {
350      return;
351   }
352
353   if (ctx->NewState) {
354      _mesa_update_state(ctx);
355   }
356
357   if (ctx->RenderMode == GL_RENDER) {
358      /* Round, to satisfy conformance tests (matches SGI's OpenGL) */
359      GLint x = IROUND(ctx->Current.RasterPos[0]);
360      GLint y = IROUND(ctx->Current.RasterPos[1]);
361      ctx->Driver.DrawDepthPixelsMESA(ctx, x, y, width, height,
362                                      colorFormat, colorType, colors,
363                                      depthType, depths, &ctx->Unpack);
364   }
365   else if (ctx->RenderMode == GL_FEEDBACK) {
366      /* Feedback the current raster pos info */
367      FLUSH_CURRENT( ctx, 0 );
368      FEEDBACK_TOKEN( ctx, (GLfloat) (GLint) GL_DRAW_PIXEL_TOKEN );
369      _mesa_feedback_vertex( ctx,
370                             ctx->Current.RasterPos,
371                             ctx->Current.RasterColor,
372                             ctx->Current.RasterIndex,
373                             ctx->Current.RasterTexCoords[0] );
374   }
375   else {
376      ASSERT(ctx->RenderMode == GL_SELECT);
377      /* Do nothing.  See OpenGL Spec, Appendix B, Corollary 6. */
378   }
379}
380
381#endif
382