more warning fixes (Karl Schultz)
[mesa.git] / src / mesa / main / accum.c
1 /* $Id: accum.c,v 1.38 2001/09/14 21:36:43 brianp Exp $ */
2
3 /*
4 * Mesa 3-D graphics library
5 * Version: 3.5
6 *
7 * Copyright (C) 1999-2001 Brian Paul All Rights Reserved.
8 *
9 * Permission is hereby granted, free of charge, to any person obtaining a
10 * copy of this software and associated documentation files (the "Software"),
11 * to deal in the Software without restriction, including without limitation
12 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
13 * and/or sell copies of the Software, and to permit persons to whom the
14 * Software is furnished to do so, subject to the following conditions:
15 *
16 * The above copyright notice and this permission notice shall be included
17 * in all copies or substantial portions of the Software.
18 *
19 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
20 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
21 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
22 * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
23 * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
24 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
25 */
26
27
28 #ifdef PC_HEADER
29 #include "all.h"
30 #else
31 #include "glheader.h"
32 #include "accum.h"
33 #include "context.h"
34 #include "macros.h"
35 #include "mem.h"
36 #include "state.h"
37 #include "mtypes.h"
38 #endif
39
40
41
42
43 void
44 _mesa_ClearAccum( GLfloat red, GLfloat green, GLfloat blue, GLfloat alpha )
45 {
46 GLfloat tmp[4];
47 GET_CURRENT_CONTEXT(ctx);
48 ASSERT_OUTSIDE_BEGIN_END(ctx);
49
50 tmp[0] = CLAMP( red, -1.0F, 1.0F );
51 tmp[1] = CLAMP( green, -1.0F, 1.0F );
52 tmp[2] = CLAMP( blue, -1.0F, 1.0F );
53 tmp[3] = CLAMP( alpha, -1.0F, 1.0F );
54
55 if (TEST_EQ_4V(tmp, ctx->Accum.ClearColor))
56 return;
57
58 FLUSH_VERTICES(ctx, _NEW_ACCUM);
59 COPY_4FV( ctx->Accum.ClearColor, tmp );
60 }
61
62 /* Should really be a driver-supplied function?
63 */
64 void
65 _mesa_Accum( GLenum op, GLfloat value )
66 {
67 GET_CURRENT_CONTEXT(ctx);
68 GLuint xpos, ypos, width, height;
69 ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
70
71 if (ctx->Visual.accumRedBits == 0 || ctx->DrawBuffer != ctx->ReadBuffer) {
72 _mesa_error(ctx, GL_INVALID_OPERATION, "glAccum");
73 return;
74 }
75
76 if (ctx->NewState)
77 _mesa_update_state( ctx );
78
79 /* Determine region to operate upon. */
80 if (ctx->Scissor.Enabled) {
81 xpos = ctx->Scissor.X;
82 ypos = ctx->Scissor.Y;
83 width = ctx->Scissor.Width;
84 height = ctx->Scissor.Height;
85 }
86 else {
87 /* whole window */
88 xpos = 0;
89 ypos = 0;
90 width = ctx->DrawBuffer->Width;
91 height = ctx->DrawBuffer->Height;
92 }
93
94 ctx->Driver.Accum( ctx, op, value, xpos, ypos, width, height );
95 }