drawpix.c revision acc722d4b890da7ed0ede24751e2bcaf28cc1468 
1/* $Id: drawpix.c,v 1.56 2001/06/26 21:15:35 brianp Exp $ */
2
3/*
4 * Mesa 3-D graphics library
5 * Version:  3.5
6 *
7 * Copyright (C) 1999-2001  Brian Paul   All Rights Reserved.
8 *
9 * Permission is hereby granted, free of charge, to any person obtaining a
10 * copy of this software and associated documentation files (the "Software"),
11 * to deal in the Software without restriction, including without limitation
12 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
13 * and/or sell copies of the Software, and to permit persons to whom the
14 * Software is furnished to do so, subject to the following conditions:
15 *
16 * The above copyright notice and this permission notice shall be included
17 * in all copies or substantial portions of the Software.
18 *
19 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
20 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
21 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
22 * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
23 * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
24 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
25 */
26
27
28#ifdef PC_HEADER
29#include "all.h"
30#else
31#include "glheader.h"
32#include "colormac.h"
33#include "context.h"
34#include "drawpix.h"
35#include "feedback.h"
36#include "macros.h"
37#include "mem.h"
38#include "mmath.h"
39#include "state.h"
40#include "mtypes.h"
41#endif
42
43
44
45/*
46 * Execute glDrawPixels
47 */
48void
49_mesa_DrawPixels( GLsizei width, GLsizei height,
50                  GLenum format, GLenum type, const GLvoid *pixels )
51{
52   GET_CURRENT_CONTEXT(ctx);
53   ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
54
55   if (ctx->RenderMode==GL_RENDER) {
56      GLint x, y;
57      if (!pixels || !ctx->Current.RasterPosValid) {
58	 return;
59      }
60
61      if (ctx->NewState) {
62         _mesa_update_state(ctx);
63      }
64
65      /* Round, to satisfy conformance tests (matches SGI's OpenGL) */
66      x = IROUND(ctx->Current.RasterPos[0]);
67      y = IROUND(ctx->Current.RasterPos[1]);
68
69      ctx->OcclusionResult = GL_TRUE;
70      ctx->Driver.DrawPixels(ctx, x, y, width, height, format, type,
71			     &ctx->Unpack, pixels);
72   }
73   else if (ctx->RenderMode==GL_FEEDBACK) {
74      if (ctx->Current.RasterPosValid) {
75	 GLfloat texcoord[4], invq;
76
77	 FLUSH_CURRENT(ctx, 0);
78         invq = 1.0F / ctx->Current.Texcoord[0][3];
79         texcoord[0] = ctx->Current.Texcoord[0][0] * invq;
80         texcoord[1] = ctx->Current.Texcoord[0][1] * invq;
81         texcoord[2] = ctx->Current.Texcoord[0][2] * invq;
82         texcoord[3] = ctx->Current.Texcoord[0][3];
83         FEEDBACK_TOKEN( ctx, (GLfloat) (GLint) GL_DRAW_PIXEL_TOKEN );
84         _mesa_feedback_vertex( ctx,
85				ctx->Current.RasterPos,
86				ctx->Current.Color,
87				ctx->Current.Index,
88				texcoord );
89      }
90   }
91   else if (ctx->RenderMode==GL_SELECT) {
92      if (ctx->Current.RasterPosValid) {
93         _mesa_update_hitflag( ctx, ctx->Current.RasterPos[2] );
94      }
95   }
96}
97
98
99
100void
101_mesa_ReadPixels( GLint x, GLint y, GLsizei width, GLsizei height,
102		  GLenum format, GLenum type, GLvoid *pixels )
103{
104   GET_CURRENT_CONTEXT(ctx);
105   ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
106
107   if (!pixels) {
108      _mesa_error( ctx, GL_INVALID_VALUE, "glReadPixels(pixels)" );
109      return;
110   }
111
112   if (ctx->NewState)
113      _mesa_update_state(ctx);
114
115   ctx->Driver.ReadPixels(ctx, x, y, width, height,
116			  format, type, &ctx->Pack, pixels);
117
118}
119
120
121
122void
123_mesa_CopyPixels( GLint srcx, GLint srcy, GLsizei width, GLsizei height,
124                  GLenum type )
125{
126   GET_CURRENT_CONTEXT(ctx);
127   GLint destx, desty;
128   ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
129
130   if (width < 0 || height < 0) {
131      _mesa_error( ctx, GL_INVALID_VALUE, "glCopyPixels" );
132      return;
133   }
134
135   if (ctx->NewState) {
136      _mesa_update_state(ctx);
137   }
138
139   if (ctx->RenderMode==GL_RENDER) {
140      /* Destination of copy: */
141      if (!ctx->Current.RasterPosValid) {
142	 return;
143      }
144
145      /* Round, to satisfy conformance tests (matches SGI's OpenGL) */
146      destx = IROUND(ctx->Current.RasterPos[0]);
147      desty = IROUND(ctx->Current.RasterPos[1]);
148
149      ctx->OcclusionResult = GL_TRUE;
150
151      ctx->Driver.CopyPixels( ctx, srcx, srcy, width, height, destx, desty,
152			      type );
153   }
154   else if (ctx->RenderMode == GL_FEEDBACK) {
155      FLUSH_CURRENT( ctx, 0 );
156      FEEDBACK_TOKEN( ctx, (GLfloat) (GLint) GL_COPY_PIXEL_TOKEN );
157      _mesa_feedback_vertex( ctx,
158			     ctx->Current.RasterPos,
159			     ctx->Current.Color,
160			     ctx->Current.Index,
161			     ctx->Current.Texcoord[0] );
162   }
163   else if (ctx->RenderMode == GL_SELECT) {
164      _mesa_update_hitflag( ctx, ctx->Current.RasterPos[2] );
165   }
166}
167
168
169
170void
171_mesa_Bitmap( GLsizei width, GLsizei height,
172              GLfloat xorig, GLfloat yorig, GLfloat xmove, GLfloat ymove,
173              const GLubyte *bitmap )
174{
175   GET_CURRENT_CONTEXT(ctx);
176   ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
177
178
179   /* Error checking */
180   if (width < 0 || height < 0) {
181      _mesa_error( ctx, GL_INVALID_VALUE, "glBitmap" );
182      return;
183   }
184
185   if (ctx->Current.RasterPosValid == GL_FALSE) {
186      return;    /* do nothing */
187   }
188
189   if (ctx->RenderMode==GL_RENDER) {
190      if (bitmap) {
191         /* Truncate, to satisfy conformance tests (matches SGI's OpenGL). */
192         GLint x = IFLOOR(ctx->Current.RasterPos[0] - xorig);
193         GLint y = IFLOOR(ctx->Current.RasterPos[1] - yorig);
194
195         if (ctx->NewState) {
196            _mesa_update_state(ctx);
197         }
198
199         ctx->OcclusionResult = GL_TRUE;
200	 ctx->Driver.Bitmap( ctx, x, y, width, height, &ctx->Unpack, bitmap );
201      }
202   }
203   else if (ctx->RenderMode==GL_FEEDBACK) {
204      GLfloat color[4], texcoord[4], invq;
205
206      color[0] = ctx->Current.RasterColor[0];
207      color[1] = ctx->Current.RasterColor[1];
208      color[2] = ctx->Current.RasterColor[2];
209      color[3] = ctx->Current.RasterColor[3];
210      if (ctx->Current.Texcoord[0][3] == 0.0)
211         invq = 1.0F;
212      else
213         invq = 1.0F / ctx->Current.RasterTexCoord[3];
214      texcoord[0] = ctx->Current.RasterTexCoord[0] * invq;
215      texcoord[1] = ctx->Current.RasterTexCoord[1] * invq;
216      texcoord[2] = ctx->Current.RasterTexCoord[2] * invq;
217      texcoord[3] = ctx->Current.RasterTexCoord[3];
218      FEEDBACK_TOKEN( ctx, (GLfloat) (GLint) GL_BITMAP_TOKEN );
219      _mesa_feedback_vertex( ctx,
220                          ctx->Current.RasterPos,
221			  color, ctx->Current.RasterIndex, texcoord );
222   }
223   else if (ctx->RenderMode==GL_SELECT) {
224      /* Bitmaps don't generate selection hits.  See appendix B of 1.1 spec. */
225   }
226
227   /* update raster position */
228   ctx->Current.RasterPos[0] += xmove;
229   ctx->Current.RasterPos[1] += ymove;
230}
231