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/*

 * Mesa 3-D graphics library

 * Version:  6.3

 *

 * Copyright (C) 1999-2005  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.

 *

 * Authors:

 *    Keith Whitwell 

 */

#include "main/imports.h"

#include "main/mtypes.h"

#include "main/api_arrayelt.h"

#include "main/bufferobj.h"

#include "math/m_eval.h"

#include "vbo.h"

#include "vbo_context.h"

#define NR_LEGACY_ATTRIBS 16

#define NR_GENERIC_ATTRIBS 16

#define NR_MAT_ATTRIBS 12

static GLuint check_size( const GLfloat *attr )

{

   if (attr[3] != 1.0) return 4;

   if (attr[2] != 0.0) return 3;

   if (attr[1] != 0.0) return 2;

   return 1;

}

static void init_legacy_currval(struct gl_context *ctx)

{

   struct vbo_context *vbo = vbo_context(ctx);

   struct gl_client_array *arrays = vbo->legacy_currval;

   GLuint i;

   memset(arrays, 0, sizeof(*arrays) * NR_LEGACY_ATTRIBS);

   /* Set up a constant (StrideB == 0) array for each current

    * attribute:

    */

   for (i = 0; i < NR_LEGACY_ATTRIBS; i++) {

      struct gl_client_array *cl = &arrays[i];

      /* Size will have to be determined at runtime:

       */

      cl->Size = check_size(ctx->Current.Attrib[i]);

      cl->Stride = 0;

      cl->StrideB = 0;

      cl->Enabled = 1;

      cl->Type = GL_FLOAT;

      cl->Format = GL_RGBA;

      cl->Ptr = (const void *)ctx->Current.Attrib[i];

      _mesa_reference_buffer_object(ctx, &cl->BufferObj,

                                    ctx->Shared->NullBufferObj);

   }

}

static void init_generic_currval(struct gl_context *ctx)

{

   struct vbo_context *vbo = vbo_context(ctx);

   struct gl_client_array *arrays = vbo->generic_currval;

   GLuint i;

   memset(arrays, 0, sizeof(*arrays) * NR_GENERIC_ATTRIBS);

   for (i = 0; i < NR_GENERIC_ATTRIBS; i++) {

      struct gl_client_array *cl = &arrays[i];

      /* This will have to be determined at runtime:

       */

      cl->Size = 1;

      cl->Type = GL_FLOAT;

      cl->Format = GL_RGBA;

      cl->Ptr = (const void *)ctx->Current.Attrib[VERT_ATTRIB_GENERIC0 + i];

      cl->Stride = 0;

      cl->StrideB = 0;

      cl->Enabled = 1;

      _mesa_reference_buffer_object(ctx, &cl->BufferObj,

                                    ctx->Shared->NullBufferObj);

   }

}

static void init_mat_currval(struct gl_context *ctx)

{

   struct vbo_context *vbo = vbo_context(ctx);

   struct gl_client_array *arrays = vbo->mat_currval;

   GLuint i;

   ASSERT(NR_MAT_ATTRIBS == MAT_ATTRIB_MAX);

   memset(arrays, 0, sizeof(*arrays) * NR_MAT_ATTRIBS);

   /* Set up a constant (StrideB == 0) array for each current

    * attribute:

    */

   for (i = 0; i < NR_MAT_ATTRIBS; i++) {

      struct gl_client_array *cl = &arrays[i];

      /* Size is fixed for the material attributes, for others will

       * be determined at runtime:

       */

      switch (i - VERT_ATTRIB_GENERIC0) {

      case MAT_ATTRIB_FRONT_SHININESS:

      case MAT_ATTRIB_BACK_SHININESS:

	 cl->Size = 1;

	 break;

      case MAT_ATTRIB_FRONT_INDEXES:

      case MAT_ATTRIB_BACK_INDEXES:

	 cl->Size = 3;

	 break;

      default:

	 cl->Size = 4;

	 break;

      }

      cl->Ptr = (const void *)ctx->Light.Material.Attrib[i];

      cl->Type = GL_FLOAT;

      cl->Format = GL_RGBA;

      cl->Stride = 0;

      cl->StrideB = 0;

      cl->Enabled = 1;

      _mesa_reference_buffer_object(ctx, &cl->BufferObj,

                                    ctx->Shared->NullBufferObj);

   }

}

GLboolean _vbo_CreateContext( struct gl_context *ctx )

{

   struct vbo_context *vbo = CALLOC_STRUCT(vbo_context);

   ctx->swtnl_im = (void *)vbo;

   /* Initialize the arrayelt helper

    */

   if (!ctx->aelt_context &&

       !_ae_create_context( ctx )) {

      return GL_FALSE;

   }

   /* TODO: remove these pointers.

    */

   vbo->legacy_currval = &vbo->currval[VBO_ATTRIB_POS];

   vbo->generic_currval = &vbo->currval[VBO_ATTRIB_GENERIC0];

   vbo->mat_currval = &vbo->currval[VBO_ATTRIB_MAT_FRONT_AMBIENT];

   init_legacy_currval( ctx );

   init_generic_currval( ctx );

   init_mat_currval( ctx );

   /* Build mappings from VERT_ATTRIB -> VBO_ATTRIB depending on type

    * of vertex program active.

    */

   {

      GLuint i;

      /* When no vertex program, pull in the material attributes in

       * the 16..32 generic range.

       */

      for (i = 0; i < 16; i++)

	 vbo->map_vp_none[i] = i;

      for (i = 0; i < 12; i++)

	 vbo->map_vp_none[16+i] = VBO_ATTRIB_MAT_FRONT_AMBIENT + i;

      for (i = 0; i < 4; i++)

	 vbo->map_vp_none[28+i] = i;

      for (i = 0; i < Elements(vbo->map_vp_arb); i++)

	 vbo->map_vp_arb[i] = i;

   }

   /* Hook our functions into exec and compile dispatch tables.  These

    * will pretty much be permanently installed, which means that the

    * vtxfmt mechanism can be removed now.

    */

   vbo_exec_init( ctx );

   if (ctx->API == API_OPENGL)

      vbo_save_init( ctx );

   _math_init_eval();

   return GL_TRUE;

}

void _vbo_InvalidateState( struct gl_context *ctx, GLuint new_state )

{

   _ae_invalidate_state(ctx, new_state);

   vbo_exec_invalidate_state(ctx, new_state);

}

void _vbo_DestroyContext( struct gl_context *ctx )

{

   struct vbo_context *vbo = vbo_context(ctx);

   if (ctx->aelt_context) {

      _ae_destroy_context( ctx );

      ctx->aelt_context = NULL;

   }

   if (vbo) {

      GLuint i;

      for (i = 0; i < VBO_ATTRIB_MAX; i++) {

         _mesa_reference_buffer_object(ctx, &vbo->currval[i].BufferObj, NULL);

      }

      vbo_exec_destroy(ctx);

      if (ctx->API == API_OPENGL)

         vbo_save_destroy(ctx);

      FREE(vbo);

      ctx->swtnl_im = NULL;

   }

}

void vbo_set_draw_func(struct gl_context *ctx, vbo_draw_func func)

{

   struct vbo_context *vbo = vbo_context(ctx);

   vbo->draw_prims = func;

}