/**************************************************************************
 * 
 * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.
 * 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, sub license, 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 (including the
 * next paragraph) 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 NON-INFRINGEMENT.
 * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS 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.
 * 
 **************************************************************************/

 /*
  * Authors:
  *   Brian Paul
  */

#include "main/imports.h"
#include "main/image.h"
#include "main/macros.h"

#include "st_context.h"
#include "st_atom.h"
#include "st_cache.h"
#include "st_draw.h"
#include "st_program.h"
#include "st_cb_accum.h"
#include "st_draw.h"
#include "st_format.h"
#include "pipe/p_context.h"
#include "pipe/p_defines.h"



static void
st_Accum(GLcontext *ctx, GLenum op, GLfloat value)
{
   const GLint xpos = ctx->DrawBuffer->_Xmin;
   const GLint ypos = ctx->DrawBuffer->_Ymin;
   const GLint width = ctx->DrawBuffer->_Xmax - xpos;
   const GLint height = ctx->DrawBuffer->_Ymax - ypos;

   switch (op) {
   case GL_ADD:
      if (value != 0.0F) {
         accum_add(ctx, value, xpos, ypos, width, height);
      }
      break;
   case GL_MULT:
      if (value != 1.0F) {
         accum_mult(ctx, value, xpos, ypos, width, height);
      }
      break;
   case GL_ACCUM:
      if (value != 0.0F) {
         accum_accum(ctx, value, xpos, ypos, width, height);
      }
      break;
   case GL_LOAD:
      accum_load(ctx, value, xpos, ypos, width, height);
      break;
   case GL_RETURN:
      accum_return(ctx, value, xpos, ypos, width, height);
      break;
   default:
      assert(0);
   }
}



void st_init_accum_functions(struct dd_function_table *functions)
{
   functions->Accum = st_Accum;
}