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/*

 * Mesa 3-D graphics library

 * Version:  6.1

 *

 * Copyright (C) 1999-2004  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/glheader.h"

#include "main/context.h"

#include "main/macros.h"

#include "math/m_eval.h"

#include "main/dispatch.h"

#include "vbo_exec.h"

static void clear_active_eval1( struct vbo_exec_context *exec, GLuint attr )

{

   assert(attr < Elements(exec->eval.map1));

   exec->eval.map1[attr].map = NULL;

}

static void clear_active_eval2( struct vbo_exec_context *exec, GLuint attr )

{

   assert(attr < Elements(exec->eval.map2));

   exec->eval.map2[attr].map = NULL;

}

static void set_active_eval1( struct vbo_exec_context *exec, GLuint attr, GLuint dim,

			      struct gl_1d_map *map )

{

   assert(attr < Elements(exec->eval.map1));

   if (!exec->eval.map1[attr].map) {

      exec->eval.map1[attr].map = map;

      exec->eval.map1[attr].sz = dim;

   }

}

static void set_active_eval2( struct vbo_exec_context *exec, GLuint attr, GLuint dim,

			      struct gl_2d_map *map )

{

   assert(attr < Elements(exec->eval.map2));

   if (!exec->eval.map2[attr].map) {

      exec->eval.map2[attr].map = map;

      exec->eval.map2[attr].sz = dim;

   }

}

void vbo_exec_eval_update( struct vbo_exec_context *exec )

{

   struct gl_context *ctx = exec->ctx;

   GLuint attr;

   /* Vertex program maps have priority over conventional attribs */

   for (attr = 0; attr < VBO_ATTRIB_FIRST_MATERIAL; attr++) {

      clear_active_eval1( exec, attr );

      clear_active_eval2( exec, attr );

   }

   if (ctx->Eval.Map1Color4)

      set_active_eval1( exec, VBO_ATTRIB_COLOR0, 4, &ctx->EvalMap.Map1Color4 );

   if (ctx->Eval.Map2Color4)

      set_active_eval2( exec, VBO_ATTRIB_COLOR0, 4, &ctx->EvalMap.Map2Color4 );

   if (ctx->Eval.Map1TextureCoord4)

      set_active_eval1( exec, VBO_ATTRIB_TEX0, 4, &ctx->EvalMap.Map1Texture4 );

   else if (ctx->Eval.Map1TextureCoord3)

      set_active_eval1( exec, VBO_ATTRIB_TEX0, 3, &ctx->EvalMap.Map1Texture3 );

   else if (ctx->Eval.Map1TextureCoord2)

      set_active_eval1( exec, VBO_ATTRIB_TEX0, 2, &ctx->EvalMap.Map1Texture2 );

   else if (ctx->Eval.Map1TextureCoord1)

      set_active_eval1( exec, VBO_ATTRIB_TEX0, 1, &ctx->EvalMap.Map1Texture1 );

   if (ctx->Eval.Map2TextureCoord4)

      set_active_eval2( exec, VBO_ATTRIB_TEX0, 4, &ctx->EvalMap.Map2Texture4 );

   else if (ctx->Eval.Map2TextureCoord3)

      set_active_eval2( exec, VBO_ATTRIB_TEX0, 3, &ctx->EvalMap.Map2Texture3 );

   else if (ctx->Eval.Map2TextureCoord2)

      set_active_eval2( exec, VBO_ATTRIB_TEX0, 2, &ctx->EvalMap.Map2Texture2 );

   else if (ctx->Eval.Map2TextureCoord1)

      set_active_eval2( exec, VBO_ATTRIB_TEX0, 1, &ctx->EvalMap.Map2Texture1 );

   if (ctx->Eval.Map1Normal)

      set_active_eval1( exec, VBO_ATTRIB_NORMAL, 3, &ctx->EvalMap.Map1Normal );

   if (ctx->Eval.Map2Normal)

      set_active_eval2( exec, VBO_ATTRIB_NORMAL, 3, &ctx->EvalMap.Map2Normal );

   if (ctx->Eval.Map1Vertex4)

      set_active_eval1( exec, VBO_ATTRIB_POS, 4, &ctx->EvalMap.Map1Vertex4 );

   else if (ctx->Eval.Map1Vertex3)

      set_active_eval1( exec, VBO_ATTRIB_POS, 3, &ctx->EvalMap.Map1Vertex3 );

   if (ctx->Eval.Map2Vertex4)

      set_active_eval2( exec, VBO_ATTRIB_POS, 4, &ctx->EvalMap.Map2Vertex4 );

   else if (ctx->Eval.Map2Vertex3)

      set_active_eval2( exec, VBO_ATTRIB_POS, 3, &ctx->EvalMap.Map2Vertex3 );

   /* _NEW_PROGRAM */

   if (ctx->VertexProgram._Enabled) {

      /* These are the 16 evaluators which GL_NV_vertex_program defines.

       * They alias and override the conventional vertex attributs.

       */

      for (attr = 0; attr < 16; attr++) {

         /* _NEW_EVAL */

         assert(attr < Elements(ctx->Eval.Map1Attrib));

         if (ctx->Eval.Map1Attrib[attr])

            set_active_eval1( exec, attr, 4, &ctx->EvalMap.Map1Attrib[attr] );

         assert(attr < Elements(ctx->Eval.Map2Attrib));

         if (ctx->Eval.Map2Attrib[attr])

            set_active_eval2( exec, attr, 4, &ctx->EvalMap.Map2Attrib[attr] );

      }

   }

   exec->eval.recalculate_maps = 0;

}

void vbo_exec_do_EvalCoord1f(struct vbo_exec_context *exec, GLfloat u)

{

   GLuint attr;

   for (attr = 1; attr <= VBO_ATTRIB_TEX7; attr++) {

      struct gl_1d_map *map = exec->eval.map1[attr].map;

      if (map) {

	 GLfloat uu = (u - map->u1) * map->du;

	 GLfloat data[4];

	 ASSIGN_4V(data, 0, 0, 0, 1);

	 _math_horner_bezier_curve(map->Points, data, uu,

				   exec->eval.map1[attr].sz,

				   map->Order);

	 COPY_SZ_4V( exec->vtx.attrptr[attr],

		     exec->vtx.attrsz[attr],

		     data );

      }

   }

   /** Vertex -- EvalCoord1f is a noop if this map not enabled:

    **/

   if (exec->eval.map1[0].map) {

      struct gl_1d_map *map = exec->eval.map1[0].map;

      GLfloat uu = (u - map->u1) * map->du;

      GLfloat vertex[4];

      ASSIGN_4V(vertex, 0, 0, 0, 1);

      _math_horner_bezier_curve(map->Points, vertex, uu,

				exec->eval.map1[0].sz,

				map->Order);

      if (exec->eval.map1[0].sz == 4)

	 CALL_Vertex4fv(GET_DISPATCH(), ( vertex ));

      else

	 CALL_Vertex3fv(GET_DISPATCH(), ( vertex ));

   }

}

void vbo_exec_do_EvalCoord2f( struct vbo_exec_context *exec,

			      GLfloat u, GLfloat v )

{

   GLuint attr;

   for (attr = 1; attr <= VBO_ATTRIB_TEX7; attr++) {

      struct gl_2d_map *map = exec->eval.map2[attr].map;

      if (map) {

	 GLfloat uu = (u - map->u1) * map->du;

	 GLfloat vv = (v - map->v1) * map->dv;

	 GLfloat data[4];

	 ASSIGN_4V(data, 0, 0, 0, 1);

	 _math_horner_bezier_surf(map->Points,

				  data,

				  uu, vv,

				  exec->eval.map2[attr].sz,

				  map->Uorder, map->Vorder);

	 COPY_SZ_4V( exec->vtx.attrptr[attr],

		     exec->vtx.attrsz[attr],

		     data );

      }

   }

   /** Vertex -- EvalCoord2f is a noop if this map not enabled:

    **/

   if (exec->eval.map2[0].map) {

      struct gl_2d_map *map = exec->eval.map2[0].map;

      GLfloat uu = (u - map->u1) * map->du;

      GLfloat vv = (v - map->v1) * map->dv;

      GLfloat vertex[4];

      ASSIGN_4V(vertex, 0, 0, 0, 1);

      if (exec->ctx->Eval.AutoNormal) {

	 GLfloat normal[4];

         GLfloat du[4], dv[4];

         _math_de_casteljau_surf(map->Points, vertex, du, dv, uu, vv,

				 exec->eval.map2[0].sz,

				 map->Uorder, map->Vorder);

	 if (exec->eval.map2[0].sz == 4) {

	    du[0] = du[0]*vertex[3] - du[3]*vertex[0];

	    du[1] = du[1]*vertex[3] - du[3]*vertex[1];

	    du[2] = du[2]*vertex[3] - du[3]*vertex[2];

	    dv[0] = dv[0]*vertex[3] - dv[3]*vertex[0];

	    dv[1] = dv[1]*vertex[3] - dv[3]*vertex[1];

	    dv[2] = dv[2]*vertex[3] - dv[3]*vertex[2];

	 }

         CROSS3(normal, du, dv);

         NORMALIZE_3FV(normal);

	 normal[3] = 1.0;

	 COPY_SZ_4V( exec->vtx.attrptr[VBO_ATTRIB_NORMAL],

		     exec->vtx.attrsz[VBO_ATTRIB_NORMAL],

		     normal );

      }

      else {

         _math_horner_bezier_surf(map->Points, vertex, uu, vv,

				  exec->eval.map2[0].sz,

				  map->Uorder, map->Vorder);

      }

      if (exec->vtx.attrsz[0] == 4)

	 CALL_Vertex4fv(GET_DISPATCH(), ( vertex ));

      else

	 CALL_Vertex3fv(GET_DISPATCH(), ( vertex ));

   }

}