accum.c revision 4a49301e 
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 "state.h"
31#include "mtypes.h"
32#include "glapi/dispatch.h"
33
34
35#if FEATURE_accum
36
37
38void GLAPIENTRY
39_mesa_ClearAccum( GLfloat red, GLfloat green, GLfloat blue, GLfloat alpha )
40{
41   GLfloat tmp[4];
42   GET_CURRENT_CONTEXT(ctx);
43   ASSERT_OUTSIDE_BEGIN_END(ctx);
44
45   tmp[0] = CLAMP( red,   -1.0F, 1.0F );
46   tmp[1] = CLAMP( green, -1.0F, 1.0F );
47   tmp[2] = CLAMP( blue,  -1.0F, 1.0F );
48   tmp[3] = CLAMP( alpha, -1.0F, 1.0F );
49
50   if (TEST_EQ_4V(tmp, ctx->Accum.ClearColor))
51      return;
52
53   FLUSH_VERTICES(ctx, _NEW_ACCUM);
54   COPY_4FV( ctx->Accum.ClearColor, tmp );
55}
56
57
58static void GLAPIENTRY
59_mesa_Accum( GLenum op, GLfloat value )
60{
61   GET_CURRENT_CONTEXT(ctx);
62   ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
63
64   switch (op) {
65   case GL_ADD:
66   case GL_MULT:
67   case GL_ACCUM:
68   case GL_LOAD:
69   case GL_RETURN:
70      /* OK */
71      break;
72   default:
73      _mesa_error(ctx, GL_INVALID_ENUM, "glAccum(op)");
74      return;
75   }
76
77   if (ctx->DrawBuffer->Visual.haveAccumBuffer == 0) {
78      _mesa_error(ctx, GL_INVALID_OPERATION, "glAccum(no accum buffer)");
79      return;
80   }
81
82   if (ctx->DrawBuffer != ctx->ReadBuffer) {
83      /* See GLX_SGI_make_current_read or WGL_ARB_make_current_read,
84       * or GL_EXT_framebuffer_blit.
85       */
86      _mesa_error(ctx, GL_INVALID_OPERATION,
87                  "glAccum(different read/draw buffers)");
88      return;
89   }
90
91   if (ctx->NewState)
92      _mesa_update_state(ctx);
93
94   if (ctx->DrawBuffer->_Status != GL_FRAMEBUFFER_COMPLETE_EXT) {
95      _mesa_error(ctx, GL_INVALID_FRAMEBUFFER_OPERATION_EXT,
96                  "glAccum(incomplete framebuffer)");
97      return;
98   }
99
100   if (ctx->RenderMode == GL_RENDER) {
101      ctx->Driver.Accum(ctx, op, value);
102   }
103}
104
105
106void
107_mesa_init_accum_dispatch(struct _glapi_table *disp)
108{
109   SET_Accum(disp, _mesa_Accum);
110   SET_ClearAccum(disp, _mesa_ClearAccum);
111}
112
113
114#endif /* FEATURE_accum */
115
116
117void
118_mesa_init_accum( GLcontext *ctx )
119{
120   /* Accumulate buffer group */
121   ASSIGN_4V( ctx->Accum.ClearColor, 0.0, 0.0, 0.0, 0.0 );
122}
123