accum.c revision 9b8059e53610d6d9d217f331b0671354e62ad47f 
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
33
34void GLAPIENTRY
35_mesa_ClearAccum( GLfloat red, GLfloat green, GLfloat blue, GLfloat alpha )
36{
37   GLfloat tmp[4];
38   GET_CURRENT_CONTEXT(ctx);
39   ASSERT_OUTSIDE_BEGIN_END(ctx);
40
41   tmp[0] = CLAMP( red,   -1.0F, 1.0F );
42   tmp[1] = CLAMP( green, -1.0F, 1.0F );
43   tmp[2] = CLAMP( blue,  -1.0F, 1.0F );
44   tmp[3] = CLAMP( alpha, -1.0F, 1.0F );
45
46   if (TEST_EQ_4V(tmp, ctx->Accum.ClearColor))
47      return;
48
49   FLUSH_VERTICES(ctx, _NEW_ACCUM);
50   COPY_4FV( ctx->Accum.ClearColor, tmp );
51}
52
53
54void GLAPIENTRY
55_mesa_Accum( GLenum op, GLfloat value )
56{
57   GET_CURRENT_CONTEXT(ctx);
58   ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
59
60   switch (op) {
61   case GL_ADD:
62   case GL_MULT:
63   case GL_ACCUM:
64   case GL_LOAD:
65   case GL_RETURN:
66      /* OK */
67      break;
68   default:
69      _mesa_error(ctx, GL_INVALID_ENUM, "glAccum(op)");
70      return;
71   }
72
73   if (ctx->DrawBuffer->Visual.haveAccumBuffer == 0) {
74      _mesa_error(ctx, GL_INVALID_OPERATION, "glAccum(no accum buffer)");
75      return;
76   }
77
78   if (ctx->DrawBuffer != ctx->ReadBuffer) {
79      /* See GLX_SGI_make_current_read or WGL_ARB_make_current_read,
80       * or GL_EXT_framebuffer_blit.
81       */
82      _mesa_error(ctx, GL_INVALID_OPERATION,
83                  "glAccum(different read/draw buffers)");
84      return;
85   }
86
87   if (ctx->NewState)
88      _mesa_update_state(ctx);
89
90   if (ctx->DrawBuffer->_Status != GL_FRAMEBUFFER_COMPLETE_EXT) {
91      _mesa_error(ctx, GL_INVALID_FRAMEBUFFER_OPERATION_EXT,
92                  "glAccum(incomplete framebuffer)");
93      return;
94   }
95
96   if (ctx->RenderMode == GL_RENDER) {
97      GLint x = ctx->DrawBuffer->_Xmin;
98      GLint y = ctx->DrawBuffer->_Ymin;
99      GLint width =  ctx->DrawBuffer->_Xmax - ctx->DrawBuffer->_Xmin;
100      GLint height = ctx->DrawBuffer->_Ymax - ctx->DrawBuffer->_Ymin;
101      ctx->Driver.Accum(ctx, op, value, x, y, width, height);
102   }
103}
104
105
106
107void
108_mesa_init_accum( GLcontext *ctx )
109{
110   /* Accumulate buffer group */
111   ASSIGN_4V( ctx->Accum.ClearColor, 0.0, 0.0, 0.0, 0.0 );
112}
113