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55 pj 1
/* $Id: accum.c,v 1.1 2003-02-28 11:41:57 pj Exp $ */
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/*
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 * Mesa 3-D graphics library
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 * Version:  4.1
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 *
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 * Copyright (C) 1999-2002  Brian Paul   All Rights Reserved.
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 *
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 * Permission is hereby granted, free of charge, to any person obtaining a
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 * copy of this software and associated documentation files (the "Software"),
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 * to deal in the Software without restriction, including without limitation
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 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
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 * and/or sell copies of the Software, and to permit persons to whom the
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 * Software is furnished to do so, subject to the following conditions:
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 *
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 * The above copyright notice and this permission notice shall be included
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 * in all copies or substantial portions of the Software.
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 *
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 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
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 * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
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 * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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 */
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#include "glheader.h"
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#include "accum.h"
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#include "context.h"
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#include "imports.h"
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#include "macros.h"
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#include "state.h"
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#include "mtypes.h"
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void
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_mesa_ClearAccum( GLfloat red, GLfloat green, GLfloat blue, GLfloat alpha )
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{
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   GLfloat tmp[4];
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   GET_CURRENT_CONTEXT(ctx);
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   ASSERT_OUTSIDE_BEGIN_END(ctx);
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   tmp[0] = CLAMP( red,   -1.0F, 1.0F );
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   tmp[1] = CLAMP( green, -1.0F, 1.0F );
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   tmp[2] = CLAMP( blue,  -1.0F, 1.0F );
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   tmp[3] = CLAMP( alpha, -1.0F, 1.0F );
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   if (TEST_EQ_4V(tmp, ctx->Accum.ClearColor))
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      return;
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   FLUSH_VERTICES(ctx, _NEW_ACCUM);
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   COPY_4FV( ctx->Accum.ClearColor, tmp );
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}
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/* Should really be a driver-supplied function?
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 */
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void
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_mesa_Accum( GLenum op, GLfloat value )
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{
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   GET_CURRENT_CONTEXT(ctx);
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   GLuint xpos, ypos, width, height;
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   ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
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   if (ctx->Visual.accumRedBits == 0 || ctx->DrawBuffer != ctx->ReadBuffer) {
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      _mesa_error(ctx, GL_INVALID_OPERATION, "glAccum");
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      return;
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   }
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   if (ctx->NewState)
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      _mesa_update_state( ctx );
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   /* Determine region to operate upon. */
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   if (ctx->Scissor.Enabled) {
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      xpos = ctx->Scissor.X;
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      ypos = ctx->Scissor.Y;
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      width = ctx->Scissor.Width;
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      height = ctx->Scissor.Height;
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   }
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   else {
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      /* whole window */
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      xpos = 0;
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      ypos = 0;
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      width = ctx->DrawBuffer->Width;
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      height = ctx->DrawBuffer->Height;
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   }
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   ctx->Driver.Accum( ctx, op, value, xpos, ypos, width, height );
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}