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/* $Id: accum.c,v 1.37 2001/03/12 00:48:37 gareth Exp $ */
/*
* Mesa 3-D graphics library
* Version: 3.5
*
* Copyright (C) 1999-2001 Brian Paul All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
* AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#ifdef PC_HEADER
#include "all.h"
#else
#include "glheader.h"
#include "accum.h"
#include "context.h"
#include "macros.h"
#include "mem.h"
#include "state.h"
#include "mtypes.h"
#endif
void
_mesa_ClearAccum( GLfloat red, GLfloat green, GLfloat blue, GLfloat alpha )
{
GLfloat tmp[4];
GET_CURRENT_CONTEXT(ctx);
ASSERT_OUTSIDE_BEGIN_END(ctx);
tmp[0] = CLAMP( red, -1.0, 1.0 );
tmp[1] = CLAMP( green, -1.0, 1.0 );
tmp[2] = CLAMP( blue, -1.0, 1.0 );
tmp[3] = CLAMP( alpha, -1.0, 1.0 );
if (TEST_EQ_4V(tmp, ctx->Accum.ClearColor))
return;
FLUSH_VERTICES(ctx, _NEW_ACCUM);
COPY_4FV( ctx->Accum.ClearColor, tmp );
}
/* Should really be a driver-supplied function?
*/
void
_mesa_Accum( GLenum op, GLfloat value )
{
GET_CURRENT_CONTEXT(ctx);
GLuint xpos, ypos, width, height;
ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
if (ctx->Visual.accumRedBits == 0 || ctx->DrawBuffer != ctx->ReadBuffer) {
_mesa_error(ctx, GL_INVALID_OPERATION, "glAccum");
return;
}
if (ctx->NewState)
_mesa_update_state( ctx );
/* Determine region to operate upon. */
if (ctx->Scissor.Enabled) {
xpos = ctx->Scissor.X;
ypos = ctx->Scissor.Y;
width = ctx->Scissor.Width;
height = ctx->Scissor.Height;
}
else {
/* whole window */
xpos = 0;
ypos = 0;
width = ctx->DrawBuffer->Width;
height = ctx->DrawBuffer->Height;
}
ctx->Driver.Accum( ctx, op, value, xpos, ypos, width, height );
}
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