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 GLuint xpos
, ypos
, width
, height
;
59 ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx
);
61 if (ctx
->Visual
.accumRedBits
== 0 || ctx
->DrawBuffer
!= ctx
->ReadBuffer
) {
62 _mesa_error(ctx
, GL_INVALID_OPERATION
, "glAccum");
75 _mesa_error(ctx
, GL_INVALID_ENUM
, "glAccum(op)");
80 _mesa_update_state( ctx
);
82 if (ctx
->RenderMode
!= GL_RENDER
) {
87 /* Determine region to operate upon. */
88 if (ctx
->Scissor
.Enabled
) {
89 xpos
= ctx
->Scissor
.X
;
90 ypos
= ctx
->Scissor
.Y
;
91 width
= ctx
->Scissor
.Width
;
92 height
= ctx
->Scissor
.Height
;
98 width
= ctx
->DrawBuffer
->Width
;
99 height
= ctx
->DrawBuffer
->Height
;
102 ctx
->Driver
.Accum( ctx
, op
, value
, xpos
, ypos
, width
, height
);
108 _mesa_init_accum( GLcontext
*ctx
)
110 /* Accumulate buffer group */
111 ASSIGN_4V( ctx
->Accum
.ClearColor
, 0.0, 0.0, 0.0, 0.0 );