drawpix.c revision 08836341788a9f9d638d9dc8328510ccd18ddeb5 
1/* $Id: drawpix.c,v 1.49 2001/03/03 20:33:27 brianp Exp $ */
2
3/*
4 * Mesa 3-D graphics library
5 * Version:  3.5
6 *
7 * Copyright (C) 1999-2000  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
47/*
48 * Execute glDrawPixels
49 */
50void
51_mesa_DrawPixels( GLsizei width, GLsizei height,
52                  GLenum format, GLenum type, const GLvoid *pixels )
53{
54   GET_CURRENT_CONTEXT(ctx);
55   ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
56
57   if (ctx->RenderMode==GL_RENDER) {
58      GLint x, y;
59      if (!pixels || !ctx->Current.RasterPosValid) {
60	 return;
61      }
62
63      if (ctx->NewState) {
64         _mesa_update_state(ctx);
65      }
66
67      x = (GLint) (ctx->Current.RasterPos[0] + 0.5F);
68      y = (GLint) (ctx->Current.RasterPos[1] + 0.5F);
69
70      ctx->OcclusionResult = GL_TRUE;
71
72      /* see if device driver can do the drawpix */
73      RENDER_START(ctx);
74      ctx->Driver.DrawPixels(ctx, x, y, width, height, format, type,
75			     &ctx->Unpack, pixels);
76      RENDER_FINISH(ctx);
77   }
78   else if (ctx->RenderMode==GL_FEEDBACK) {
79      if (ctx->Current.RasterPosValid) {
80         GLfloat color[4];
81	 GLfloat texcoord[4], invq;
82
83	 FLUSH_CURRENT(ctx, 0);
84         color[0] = CHAN_TO_FLOAT(ctx->Current.Color[0]);
85         color[1] = CHAN_TO_FLOAT(ctx->Current.Color[1]);
86         color[2] = CHAN_TO_FLOAT(ctx->Current.Color[2]);
87         color[3] = CHAN_TO_FLOAT(ctx->Current.Color[3]);
88         invq = 1.0F / ctx->Current.Texcoord[0][3];
89         texcoord[0] = ctx->Current.Texcoord[0][0] * invq;
90         texcoord[1] = ctx->Current.Texcoord[0][1] * invq;
91         texcoord[2] = ctx->Current.Texcoord[0][2] * invq;
92         texcoord[3] = ctx->Current.Texcoord[0][3];
93         FEEDBACK_TOKEN( ctx, (GLfloat) (GLint) GL_DRAW_PIXEL_TOKEN );
94         _mesa_feedback_vertex( ctx,
95                             ctx->Current.RasterPos,
96                             color, ctx->Current.Index, texcoord );
97      }
98   }
99   else if (ctx->RenderMode==GL_SELECT) {
100      if (ctx->Current.RasterPosValid) {
101         _mesa_update_hitflag( ctx, ctx->Current.RasterPos[2] );
102      }
103   }
104}
105
106