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/* $Id: t_array_api.c,v 1.2 2003-04-24 14:22:20 giacomo Exp $ */

/*

 * Mesa 3-D graphics library

 * Version:  4.1

 *

 * Copyright (C) 1999-2002  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.

 */

/**

 * \file vpexec.c

 * \brief Vertex array API functions (glDrawArrays, etc)

 * \author Keith Whitwell

 */

#include "glheader.h"

#include "api_validate.h"

#include "context.h"

#include "imports.h"

#include "macros.h"

#include "mmath.h"

#include "mtypes.h"

#include "state.h"

#include "array_cache/acache.h"

#include "t_array_api.h"

#include "t_import_array.h"

#include "t_imm_api.h"

#include "t_imm_exec.h"

#include "t_context.h"

#include "t_pipeline.h"

static void fallback_drawarrays( GLcontext *ctx, GLenum mode, GLint start,

                                 GLsizei count )

{

   if (_tnl_hard_begin( ctx, mode )) {

      GLint i;

      for (i = start; i < count; i++)

         glArrayElement( i );

      glEnd();

   }

}

static void fallback_drawelements( GLcontext *ctx, GLenum mode, GLsizei count,

                                   const GLuint *indices)

{

   if (_tnl_hard_begin(ctx, mode)) {

      GLint i;

      for (i = 0 ; i < count ; i++)

         glArrayElement( indices[i] );

      glEnd();

   }

}

static void _tnl_draw_range_elements( GLcontext *ctx, GLenum mode,

                                      GLuint start, GLuint end,

                                      GLsizei count, const GLuint *indices )

{

   TNLcontext *tnl = TNL_CONTEXT(ctx);

   FLUSH_CURRENT( ctx, 0 );

   /*  _mesa_debug(ctx, "%s\n", __FUNCTION__); */

   if (tnl->pipeline.build_state_changes)

      _tnl_validate_pipeline( ctx );

   _tnl_vb_bind_arrays( ctx, start, end );

   tnl->vb.FirstPrimitive = 0;

   tnl->vb.Primitive[0] = mode | PRIM_BEGIN | PRIM_END | PRIM_LAST;

   tnl->vb.PrimitiveLength[0] = count;

   tnl->vb.Elts = (GLuint *)indices;

   if (ctx->Array.LockCount)

      tnl->Driver.RunPipeline( ctx );

   else {

      /* Note that arrays may have changed before/after execution.

       */

      tnl->pipeline.run_input_changes |= ctx->Array._Enabled;

      tnl->Driver.RunPipeline( ctx );

      tnl->pipeline.run_input_changes |= ctx->Array._Enabled;

   }

}

/**

 * Called via the GL API dispatcher.

 */

void

_tnl_DrawArrays(GLenum mode, GLint start, GLsizei count)

{

   GET_CURRENT_CONTEXT(ctx);

   TNLcontext *tnl = TNL_CONTEXT(ctx);

   struct vertex_buffer *VB = &tnl->vb;

   GLuint thresh = (ctx->Driver.NeedFlush & FLUSH_STORED_VERTICES) ? 30 : 10;

   if (MESA_VERBOSE & VERBOSE_API)

      _mesa_debug(NULL, "_tnl_DrawArrays %d %d\n", start, count);

   /* Check arguments, etc.

    */

   if (!_mesa_validate_DrawArrays( ctx, mode, start, count ))

      return;

   if (tnl->pipeline.build_state_changes)

      _tnl_validate_pipeline( ctx );

   if (ctx->CompileFlag) {

      fallback_drawarrays( ctx, mode, start, start + count );

   }    

   else if (!ctx->Array.LockCount && (GLuint) count < thresh) {

      /* Small primitives: attempt to share a vb (at the expense of

       * using the immediate interface).

      */

      fallback_drawarrays( ctx, mode, start, start + count );

   }

   else if (ctx->Array.LockCount &&

            count < (GLint) ctx->Const.MaxArrayLockSize) {

      /* Locked primitives which can fit in a single vertex buffer:

       */

      FLUSH_CURRENT( ctx, 0 );

      if (start < (GLint) ctx->Array.LockFirst)

         start = ctx->Array.LockFirst;

      if (start + count > (GLint) ctx->Array.LockCount)

         count = ctx->Array.LockCount - start;

      /* Locked drawarrays.  Reuse any previously transformed data.

       */

      _tnl_vb_bind_arrays( ctx, ctx->Array.LockFirst, ctx->Array.LockCount );

      VB->FirstPrimitive = start;

      VB->Primitive[start] = mode | PRIM_BEGIN | PRIM_END | PRIM_LAST;

      VB->PrimitiveLength[start] = count;

      tnl->Driver.RunPipeline( ctx );

   }

   else {

      int bufsz = 256;          /* Use a small buffer for cache goodness */

      int j, nr;

      int minimum, modulo, skip;

      /* Large primitives requiring decomposition to multiple vertex

       * buffers:

       */

      switch (mode) {

      case GL_POINTS:

         minimum = 0;

         modulo = 1;

         skip = 0;

      case GL_LINES:

         minimum = 1;

         modulo = 2;

         skip = 1;

      case GL_LINE_STRIP:

         minimum = 1;

         modulo = 1;

         skip = 0;

         break;

      case GL_TRIANGLES:

         minimum = 2;

         modulo = 3;

         skip = 2;

         break;

      case GL_TRIANGLE_STRIP:

         minimum = 2;

         modulo = 1;

         skip = 0;

         break;

      case GL_QUADS:

         minimum = 3;

         modulo = 4;

         skip = 3;

         break;

      case GL_QUAD_STRIP:

         minimum = 3;

         modulo = 2;

         skip = 0;

         break;

      case GL_LINE_LOOP:

      case GL_TRIANGLE_FAN:

      case GL_POLYGON:

      default:

         /* Primitives requiring a copied vertex (fan-like primitives)

          * must use the slow path if they cannot fit in a single

          * vertex buffer.  

          */

         if (count < (GLint) ctx->Const.MaxArrayLockSize) {

            bufsz = ctx->Const.MaxArrayLockSize;

            minimum = 0;

            modulo = 1;

            skip = 0;

         }

         else {

            fallback_drawarrays( ctx, mode, start, start + count );

            return;

         }

      }

      FLUSH_CURRENT( ctx, 0 );

      bufsz -= bufsz % modulo;

      bufsz -= minimum;

      count += start;

      for (j = start + minimum ; j < count ; j += nr + skip ) {

         nr = MIN2( bufsz, count - j );

         _tnl_vb_bind_arrays( ctx, j - minimum, j + nr );

         VB->FirstPrimitive = 0;

         VB->Primitive[0] = mode | PRIM_BEGIN | PRIM_END | PRIM_LAST;

         VB->PrimitiveLength[0] = nr + minimum;

         tnl->pipeline.run_input_changes |= ctx->Array._Enabled;

         tnl->Driver.RunPipeline( ctx );

         tnl->pipeline.run_input_changes |= ctx->Array._Enabled;

      }

   }

}

/**

 * Called via the GL API dispatcher.

 */

void

_tnl_DrawRangeElements(GLenum mode,

                       GLuint start, GLuint end,

                       GLsizei count, GLenum type, const GLvoid *indices)

{

   GET_CURRENT_CONTEXT(ctx);

   GLuint *ui_indices;

   if (MESA_VERBOSE & VERBOSE_API)

      _mesa_debug(NULL, "_tnl_DrawRangeElements %d %d %d\n", start, end, count);

   /* Check arguments, etc.

    */

   if (!_mesa_validate_DrawRangeElements( ctx, mode, start, end, count,

                                          type, indices ))

      return;

   ui_indices = (GLuint *)_ac_import_elements( ctx, GL_UNSIGNED_INT,

                                               count, type, indices );

   if (ctx->CompileFlag) {

      /* Can't do anything when compiling:

       */

      fallback_drawelements( ctx, mode, count, ui_indices );

   }

   else if (ctx->Array.LockCount) {

      /* Are the arrays already locked?  If so we currently have to look

       * at the whole locked range.

       */

      if (start >= ctx->Array.LockFirst && end <= ctx->Array.LockCount)

         _tnl_draw_range_elements( ctx, mode,

                                   ctx->Array.LockFirst,

                                   ctx->Array.LockCount,

                                   count, ui_indices );

      else {

         /* The spec says referencing elements outside the locked

          * range is undefined.  I'm going to make it a noop this time

          * round, maybe come up with something beter before 3.6.

          *

          * May be able to get away with just setting LockCount==0,

          * though this raises the problems of dependent state.  May

          * have to call glUnlockArrays() directly?

          *

          * Or scan the list and replace bad indices?

          */

         _mesa_problem( ctx,

                     "DrawRangeElements references "

                     "elements outside locked range.");

      }

   }

   else if (end + 1 - start < ctx->Const.MaxArrayLockSize) {

      /* The arrays aren't locked but we can still fit them inside a

       * single vertexbuffer.

       */

      _tnl_draw_range_elements( ctx, mode, start, end + 1, count, ui_indices );

   } else {

      /* Range is too big to optimize:

       */

      fallback_drawelements( ctx, mode, count, ui_indices );

   }

}

/**

 * Called via the GL API dispatcher.

 */

void

_tnl_DrawElements(GLenum mode, GLsizei count, GLenum type,

                  const GLvoid *indices)

{

   GET_CURRENT_CONTEXT(ctx);

   GLuint *ui_indices;

   if (MESA_VERBOSE & VERBOSE_API)

      _mesa_debug(NULL, "_tnl_DrawElements %d\n", count);

   /* Check arguments, etc.

    */

   if (!_mesa_validate_DrawElements( ctx, mode, count, type, indices ))

      return;

   ui_indices = (GLuint *)_ac_import_elements( ctx, GL_UNSIGNED_INT,

                                               count, type, indices );

   if (ctx->CompileFlag) {

      /* Can't do anything when compiling:

       */

      fallback_drawelements( ctx, mode, count, ui_indices );

   }

   else if (ctx->Array.LockCount) {

      _tnl_draw_range_elements( ctx, mode,

                                ctx->Array.LockFirst,

                                ctx->Array.LockCount,

                                count, ui_indices );

   }

   else {

      /* Scan the index list and see if we can use the locked path anyway.

       */

      GLuint max_elt = 0;

      GLint i;

      for (i = 0 ; i < count ; i++)

         if (ui_indices[i] > max_elt)

            max_elt = ui_indices[i];

      if (max_elt < ctx->Const.MaxArrayLockSize && /* can we use it? */

          max_elt < (GLuint) count)                /* do we want to use it? */

         _tnl_draw_range_elements( ctx, mode, 0, max_elt+1, count, ui_indices );

      else

         fallback_drawelements( ctx, mode, count, ui_indices );

   }

}

/**

 * Initialize context's vertex array fields.  Called during T 'n L context

 * creation.

 */

void _tnl_array_init( GLcontext *ctx )

{

   TNLcontext *tnl = TNL_CONTEXT(ctx);

   struct vertex_arrays *tmp = &tnl->array_inputs;

   GLvertexformat *vfmt = &(TNL_CONTEXT(ctx)->vtxfmt);

   GLuint i;

   vfmt->DrawArrays = _tnl_DrawArrays;

   vfmt->DrawElements = _tnl_DrawElements;

   vfmt->DrawRangeElements = _tnl_DrawRangeElements;

   /* Setup vector pointers that will be used to bind arrays to VB's.

    */

   _mesa_vector4f_init( &tmp->Obj, 0, 0 );

   _mesa_vector4f_init( &tmp->Normal, 0, 0 );  

   _mesa_vector4f_init( &tmp->FogCoord, 0, 0 );

   _mesa_vector1ui_init( &tmp->Index, 0, 0 );

   _mesa_vector1ub_init( &tmp->EdgeFlag, 0, 0 );

   for (i = 0; i < ctx->Const.MaxTextureUnits; i++)

      _mesa_vector4f_init( &tmp->TexCoord[i], 0, 0);

   tnl->tmp_primitive = (GLuint *)MALLOC(sizeof(GLuint)*tnl->vb.Size);

   tnl->tmp_primitive_length = (GLuint *)MALLOC(sizeof(GLuint)*tnl->vb.Size);

}

/**

 * Destroy the context's vertex array stuff.

 * Called during T 'n L context destruction.

 */

void _tnl_array_destroy( GLcontext *ctx )

{

   TNLcontext *tnl = TNL_CONTEXT(ctx);

   if (tnl->tmp_primitive_length) FREE(tnl->tmp_primitive_length);

   if (tnl->tmp_primitive) FREE(tnl->tmp_primitive);

}