/**************************************************************************
 * 
 * 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:
  *   Keith Whitwell <keith@tungstengraphics.com>
  *   Brian Paul
  */
 

#include "main/macros.h"

#include "st_context.h"
#include "st_atom.h"
#include "st_texture.h"
#include "st_cb_texture.h"
#include "pipe/p_context.h"
#include "util/u_inlines.h"
#include "cso_cache/cso_context.h"


static void 
update_textures(struct st_context *st)
{
   struct gl_vertex_program *vprog = st->ctx->VertexProgram._Current;
   struct gl_fragment_program *fprog = st->ctx->FragmentProgram._Current;
   const GLbitfield samplersUsed = (vprog->Base.SamplersUsed |
                                    fprog->Base.SamplersUsed);
   GLuint su;

   st->state.num_textures = 0;

   /* loop over sampler units (aka tex image units) */
   for (su = 0; su < st->ctx->Const.MaxTextureImageUnits; su++) {
      struct pipe_texture *pt = NULL;

      if (samplersUsed & (1 << su)) {
         struct gl_texture_object *texObj;
         struct st_texture_object *stObj;
         GLboolean flush, retval;
         GLuint texUnit;

         if (fprog->Base.SamplersUsed & (1 << su))
            texUnit = fprog->Base.SamplerUnits[su];
         else
            texUnit = vprog->Base.SamplerUnits[su];

         texObj = st->ctx->Texture.Unit[texUnit]._Current;

         if (!texObj) {
            texObj = st_get_default_texture(st);
         }
         stObj = st_texture_object(texObj);

         retval = st_finalize_texture(st->ctx, st->pipe, texObj, &flush);
         if (!retval) {
            /* out of mem */
            continue;
         }

         st->state.num_textures = su + 1;

         pt = st_get_stobj_texture(stObj);
      }

      /*
      if (pt) {
         printf("%s su=%u non-null\n", __FUNCTION__, su);
      }
      else {
         printf("%s su=%u null\n", __FUNCTION__, su);
      }
      */

      pipe_texture_reference(&st->state.sampler_texture[su], pt);
   }

   cso_set_sampler_textures(st->cso_context,
                            st->state.num_textures,
                            st->state.sampler_texture);
   if (st->ctx->Const.MaxVertexTextureImageUnits > 0) {
      cso_set_vertex_sampler_textures(st->cso_context,
                                      MIN2(st->state.num_textures,
                                           st->ctx->Const.MaxVertexTextureImageUnits),
                                      st->state.sampler_texture);
   }
}


const struct st_tracked_state st_update_texture = {
   "st_update_texture",					/* name */
   {							/* dirty */
      _NEW_TEXTURE,					/* mesa */
      ST_NEW_FRAGMENT_PROGRAM,				/* st */
   },
   update_textures					/* update */
};




static void 
finalize_textures(struct st_context *st)
{
   struct gl_fragment_program *fprog = st->ctx->FragmentProgram._Current;
   const GLboolean prev_missing_textures = st->missing_textures;
   GLuint su;

   st->missing_textures = GL_FALSE;

   for (su = 0; su < st->ctx->Const.MaxTextureCoordUnits; su++) {
      if (fprog->Base.SamplersUsed & (1 << su)) {
         const GLuint texUnit = fprog->Base.SamplerUnits[su];
         struct gl_texture_object *texObj
            = st->ctx->Texture.Unit[texUnit]._Current;
         struct st_texture_object *stObj = st_texture_object(texObj);

         if (texObj) {
            GLboolean flush, retval;

            retval = st_finalize_texture(st->ctx, st->pipe, texObj, &flush);
            if (!retval) {
               /* out of mem */
               st->missing_textures = GL_TRUE;
               continue;
            }

            stObj->teximage_realloc = TRUE;
         }
      }
   }

   if (prev_missing_textures != st->missing_textures)
      st->dirty.st |= ST_NEW_FRAGMENT_PROGRAM;
}



const struct st_tracked_state st_finalize_textures = {
   "st_finalize_textures",		/* name */
   {					/* dirty */
      _NEW_TEXTURE,			/* mesa */
      0,				/* st */
   },
   finalize_textures			/* update */
};