accum.c revision ac997013 
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 "accum.h"
27#include "context.h"
28#include "imports.h"
29#include "macros.h"
30#include "mfeatures.h"
31#include "state.h"
32#include "GL/glext.h"
33#include "mtypes.h"
34#include "main/dispatch.h"
35
36
37#if FEATURE_accum
38
39
40void GLAPIENTRY
41_mesa_ClearAccum( GLfloat red, GLfloat green, GLfloat blue, GLfloat alpha )
42{
43   GLfloat tmp[4];
44   GET_CURRENT_CONTEXT(ctx);
45   ASSERT_OUTSIDE_BEGIN_END(ctx);
46
47   tmp[0] = CLAMP( red,   -1.0F, 1.0F );
48   tmp[1] = CLAMP( green, -1.0F, 1.0F );
49   tmp[2] = CLAMP( blue,  -1.0F, 1.0F );
50   tmp[3] = CLAMP( alpha, -1.0F, 1.0F );
51
52   if (TEST_EQ_4V(tmp, ctx->Accum.ClearColor))
53      return;
54
55   COPY_4FV( ctx->Accum.ClearColor, tmp );
56}
57
58
59static void GLAPIENTRY
60_mesa_Accum( GLenum op, GLfloat value )
61{
62   GET_CURRENT_CONTEXT(ctx);
63   ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
64
65   switch (op) {
66   case GL_ADD:
67   case GL_MULT:
68   case GL_ACCUM:
69   case GL_LOAD:
70   case GL_RETURN:
71      /* OK */
72      break;
73   default:
74      _mesa_error(ctx, GL_INVALID_ENUM, "glAccum(op)");
75      return;
76   }
77
78   if (ctx->DrawBuffer->Visual.haveAccumBuffer == 0) {
79      _mesa_error(ctx, GL_INVALID_OPERATION, "glAccum(no accum buffer)");
80      return;
81   }
82
83   if (ctx->DrawBuffer != ctx->ReadBuffer) {
84      /* See GLX_SGI_make_current_read or WGL_ARB_make_current_read,
85       * or GL_EXT_framebuffer_blit.
86       */
87      _mesa_error(ctx, GL_INVALID_OPERATION,
88                  "glAccum(different read/draw buffers)");
89      return;
90   }
91
92   if (ctx->NewState)
93      _mesa_update_state(ctx);
94
95   if (ctx->DrawBuffer->_Status != GL_FRAMEBUFFER_COMPLETE_EXT) {
96      _mesa_error(ctx, GL_INVALID_FRAMEBUFFER_OPERATION_EXT,
97                  "glAccum(incomplete framebuffer)");
98      return;
99   }
100
101   if (ctx->RenderMode == GL_RENDER) {
102      ctx->Driver.Accum(ctx, op, value);
103   }
104}
105
106
107void
108_mesa_init_accum_dispatch(struct _glapi_table *disp)
109{
110   SET_Accum(disp, _mesa_Accum);
111   SET_ClearAccum(disp, _mesa_ClearAccum);
112}
113
114
115#endif /* FEATURE_accum */
116
117
118void
119_mesa_init_accum( struct gl_context *ctx )
120{
121   /* Accumulate buffer group */
122   ASSIGN_4V( ctx->Accum.ClearColor, 0.0, 0.0, 0.0, 0.0 );
123}
124