2 * Mesa 3-D graphics library
5 * Copyright (C) 1999-2005 Brian Paul All Rights Reserved.
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:
14 * The above copyright notice and this permission notice shall be included
15 * in all copies or substantial portions of the Software.
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.
35 _mesa_ClearAccum( GLfloat red
, GLfloat green
, GLfloat blue
, GLfloat alpha
)
38 GET_CURRENT_CONTEXT(ctx
);
39 ASSERT_OUTSIDE_BEGIN_END(ctx
);
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
);
46 if (TEST_EQ_4V(tmp
, ctx
->Accum
.ClearColor
))
49 FLUSH_VERTICES(ctx
, _NEW_ACCUM
);
50 COPY_4FV( ctx
->Accum
.ClearColor
, tmp
);
55 _mesa_Accum( GLenum op
, GLfloat value
)
57 GET_CURRENT_CONTEXT(ctx
);
58 ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx
);
69 _mesa_error(ctx
, GL_INVALID_ENUM
, "glAccum(op)");
73 if (ctx
->DrawBuffer
->Visual
.haveAccumBuffer
== 0) {
74 _mesa_error(ctx
, GL_INVALID_OPERATION
, "glAccum(no accum buffer)");
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.
82 _mesa_error(ctx
, GL_INVALID_OPERATION
,
83 "glAccum(different read/draw buffers)");
88 _mesa_update_state(ctx
);
90 if (ctx
->DrawBuffer
->_Status
!= GL_FRAMEBUFFER_COMPLETE_EXT
) {
91 _mesa_error(ctx
, GL_INVALID_FRAMEBUFFER_OPERATION_EXT
,
92 "glAccum(incomplete framebuffer)");
96 if (ctx
->RenderMode
== GL_RENDER
) {
97 ctx
->Driver
.Accum(ctx
, op
, value
);
104 _mesa_init_accum( GLcontext
*ctx
)
106 /* Accumulate buffer group */
107 ASSIGN_4V( ctx
->Accum
.ClearColor
, 0.0, 0.0, 0.0, 0.0 );