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/*

 * Mesa 3-D graphics library

 *

 * 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

 * THE AUTHORS OR COPYRIGHT HOLDERS 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 

 */

/*

 * Render whole vertex buffers, including projection of vertices from

 * clip space and clipping of primitives.

 *

 * This file makes calls to project vertices and to the point, line

 * and triangle rasterizers via the function pointers:

 *

 *    context->Driver.Render.*

 *

 */

#include "main/glheader.h"

#include "main/context.h"

#include "main/enums.h"

#include "main/macros.h"

#include "main/imports.h"

#include "main/mtypes.h"

#include "math/m_xform.h"

#include "t_pipeline.h"

/**********************************************************************/

/*                        Clip single primitives                      */

/**********************************************************************/

#define W(i) coord[i][3]

#define Z(i) coord[i][2]

#define Y(i) coord[i][1]

#define X(i) coord[i][0]

#define SIZE 4

#define TAG(x) x##_4

#include "t_vb_cliptmp.h"

/**********************************************************************/

/*              Clip and render whole begin/end objects               */

/**********************************************************************/

#define NEED_EDGEFLAG_SETUP (ctx->Polygon.FrontMode != GL_FILL || ctx->Polygon.BackMode != GL_FILL)

#define EDGEFLAG_GET(idx) VB->EdgeFlag[idx]

#define EDGEFLAG_SET(idx, val) VB->EdgeFlag[idx] = val

/* This does NOT include the CLIP_USER_BIT! */

#define CLIPMASK (CLIP_FRUSTUM_BITS | CLIP_CULL_BIT)

/* Vertices, with the possibility of clipping.

 */

#define RENDER_POINTS( start, count ) \

   tnl->Driver.Render.Points( ctx, start, count )

#define RENDER_LINE( v1, v2 )			\

do {						\

   GLubyte c1 = mask[v1], c2 = mask[v2];	\

   GLubyte ormask = c1|c2;			\

   if (!ormask)					\

      LineFunc( ctx, v1, v2 );			\

   else if (!(c1 & c2 & CLIPMASK))			\

      clip_line_4( ctx, v1, v2, ormask );	\

} while (0)

#define RENDER_TRI( v1, v2, v3 )			\

do {							\

   GLubyte c1 = mask[v1], c2 = mask[v2], c3 = mask[v3];	\

   GLubyte ormask = c1|c2|c3;				\

   if (!ormask)						\

      TriangleFunc( ctx, v1, v2, v3 );			\

   else if (!(c1 & c2 & c3 & CLIPMASK)) 			\

      clip_tri_4( ctx, v1, v2, v3, ormask );    	\

} while (0)

#define RENDER_QUAD( v1, v2, v3, v4 )			\

do {							\

   GLubyte c1 = mask[v1], c2 = mask[v2];		\

   GLubyte c3 = mask[v3], c4 = mask[v4];		\

   GLubyte ormask = c1|c2|c3|c4;			\

   if (!ormask)						\

      QuadFunc( ctx, v1, v2, v3, v4 );			\

   else if (!(c1 & c2 & c3 & c4 & CLIPMASK)) 		\

      clip_quad_4( ctx, v1, v2, v3, v4, ormask );	\

} while (0)

#define LOCAL_VARS						\

   TNLcontext *tnl = TNL_CONTEXT(ctx);				\

   struct vertex_buffer *VB = &tnl->vb;				\

   const GLuint * const elt = VB->Elts;				\

   const GLubyte *mask = VB->ClipMask;				\

   const GLuint sz = VB->ClipPtr->size;				\

   const tnl_line_func LineFunc = tnl->Driver.Render.Line;		\

   const tnl_triangle_func TriangleFunc = tnl->Driver.Render.Triangle;	\

   const tnl_quad_func QuadFunc = tnl->Driver.Render.Quad;		\

   const GLboolean stipple = ctx->Line.StippleFlag;		\

   (void) (LineFunc && TriangleFunc && QuadFunc);		\

   (void) elt; (void) mask; (void) sz; (void) stipple;

#define TAG(x) clip_##x##_verts

#define INIT(x) tnl->Driver.Render.PrimitiveNotify( ctx, x )

#define RESET_STIPPLE if (stipple) tnl->Driver.Render.ResetLineStipple( ctx )

#define PRESERVE_VB_DEFS

#include "t_vb_rendertmp.h"

/* Elts, with the possibility of clipping.

 */

#undef ELT

#undef TAG

#define ELT(x) elt[x]

#define TAG(x) clip_##x##_elts

#include "t_vb_rendertmp.h"

/* TODO: do this for all primitives, verts and elts:

 */

static void clip_elt_triangles( struct gl_context *ctx,

				GLuint start,

				GLuint count,

				GLuint flags )

{

   TNLcontext *tnl = TNL_CONTEXT(ctx);

   tnl_render_func render_tris = tnl->Driver.Render.PrimTabElts[GL_TRIANGLES];

   struct vertex_buffer *VB = &tnl->vb;

   const GLuint * const elt = VB->Elts;

   GLubyte *mask = VB->ClipMask;

   GLuint last = count-2;

   GLuint j;

   (void) flags;

   tnl->Driver.Render.PrimitiveNotify( ctx, GL_TRIANGLES );

   for (j=start; j < last; j+=3 ) {

      GLubyte c1 = mask[elt[j]];

      GLubyte c2 = mask[elt[j+1]];

      GLubyte c3 = mask[elt[j+2]];

      GLubyte ormask = c1|c2|c3;

      if (ormask) {

	 if (start < j)

	    render_tris( ctx, start, j, 0 );

	 if (!(c1&c2&c3&CLIPMASK))

	    clip_tri_4( ctx, elt[j], elt[j+1], elt[j+2], ormask );

	 start = j+3;

      }

   }

   if (start < j)

      render_tris( ctx, start, j, 0 );

}

/**********************************************************************/

/*                  Render whole begin/end objects                    */

/**********************************************************************/

#define NEED_EDGEFLAG_SETUP (ctx->Polygon.FrontMode != GL_FILL || ctx->Polygon.BackMode != GL_FILL)

#define EDGEFLAG_GET(idx) VB->EdgeFlag[idx]

#define EDGEFLAG_SET(idx, val) VB->EdgeFlag[idx] = val

/* Vertices, no clipping.

 */

#define RENDER_POINTS( start, count ) \

   tnl->Driver.Render.Points( ctx, start, count )

#define RENDER_LINE( v1, v2 ) \

   LineFunc( ctx, v1, v2 )

#define RENDER_TRI( v1, v2, v3 ) \

   TriangleFunc( ctx, v1, v2, v3 )

#define RENDER_QUAD( v1, v2, v3, v4 ) \

   QuadFunc( ctx, v1, v2, v3, v4 )

#define TAG(x) _tnl_##x##_verts

#define LOCAL_VARS						\

   TNLcontext *tnl = TNL_CONTEXT(ctx);				\

   struct vertex_buffer *VB = &tnl->vb;				\

   const GLuint * const elt = VB->Elts;				\

   const tnl_line_func LineFunc = tnl->Driver.Render.Line;		\

   const tnl_triangle_func TriangleFunc = tnl->Driver.Render.Triangle;	\

   const tnl_quad_func QuadFunc = tnl->Driver.Render.Quad;		\

   const GLboolean stipple = ctx->Line.StippleFlag;		\

   (void) (LineFunc && TriangleFunc && QuadFunc);		\

   (void) elt; (void) stipple

#define RESET_STIPPLE if (stipple) tnl->Driver.Render.ResetLineStipple( ctx )

#define INIT(x) tnl->Driver.Render.PrimitiveNotify( ctx, x )

#define RENDER_TAB_QUALIFIER

#define PRESERVE_VB_DEFS

#include "t_vb_rendertmp.h"

/* Elts, no clipping.

 */

#undef ELT

#define TAG(x) _tnl_##x##_elts

#define ELT(x) elt[x]

#include "t_vb_rendertmp.h"

/**********************************************************************/

/*              Helper functions for drivers                  */

/**********************************************************************/

void _tnl_RenderClippedPolygon( struct gl_context *ctx, const GLuint *elts, GLuint n )

{

   TNLcontext *tnl = TNL_CONTEXT(ctx);

   struct vertex_buffer *VB = &tnl->vb;

   GLuint *tmp = VB->Elts;

   VB->Elts = (GLuint *)elts;

   tnl->Driver.Render.PrimTabElts[GL_POLYGON]( ctx, 0, n, PRIM_BEGIN|PRIM_END );

   VB->Elts = tmp;

}

void _tnl_RenderClippedLine( struct gl_context *ctx, GLuint ii, GLuint jj )

{

   TNLcontext *tnl = TNL_CONTEXT(ctx);

   tnl->Driver.Render.Line( ctx, ii, jj );

}

/**********************************************************************/

/*              Clip and render whole vertex buffers                  */

/**********************************************************************/

static GLboolean run_render( struct gl_context *ctx,

			     struct tnl_pipeline_stage *stage )

{

   TNLcontext *tnl = TNL_CONTEXT(ctx);

   struct vertex_buffer *VB = &tnl->vb;

   tnl_render_func *tab;

   GLint pass = 0;

   /* Allow the drivers to lock before projected verts are built so

    * that window coordinates are guarenteed not to change before

    * rendering.

    */

   ASSERT(tnl->Driver.Render.Start);

   tnl->Driver.Render.Start( ctx );

   ASSERT(tnl->Driver.Render.BuildVertices);

   ASSERT(tnl->Driver.Render.PrimitiveNotify);

   ASSERT(tnl->Driver.Render.Points);

   ASSERT(tnl->Driver.Render.Line);

   ASSERT(tnl->Driver.Render.Triangle);

   ASSERT(tnl->Driver.Render.Quad);

   ASSERT(tnl->Driver.Render.ResetLineStipple);

   ASSERT(tnl->Driver.Render.Interp);

   ASSERT(tnl->Driver.Render.CopyPV);

   ASSERT(tnl->Driver.Render.ClippedLine);

   ASSERT(tnl->Driver.Render.ClippedPolygon);

   ASSERT(tnl->Driver.Render.Finish);

   tnl->Driver.Render.BuildVertices( ctx, 0, VB->Count, ~0 );

   if (VB->ClipOrMask) {

      tab = VB->Elts ? clip_render_tab_elts : clip_render_tab_verts;

      clip_render_tab_elts[GL_TRIANGLES] = clip_elt_triangles;

   }

   else {

      tab = (VB->Elts ?

	     tnl->Driver.Render.PrimTabElts :

	     tnl->Driver.Render.PrimTabVerts);

   }

   do

   {

      GLuint i;

      for (i = 0 ; i < VB->PrimitiveCount ; i++)

      {

	 GLuint prim = _tnl_translate_prim(&VB->Primitive[i]);

	 GLuint start = VB->Primitive[i].start;

	 GLuint length = VB->Primitive[i].count;

	 assert((prim & PRIM_MODE_MASK) <= GL_POLYGON);

	 if (MESA_VERBOSE & VERBOSE_PRIMS)

	    _mesa_debug(NULL, "MESA prim %s %d..%d\n",

			_mesa_lookup_enum_by_nr(prim & PRIM_MODE_MASK),

			start, start+length);

	 if (length)

	    tab[prim & PRIM_MODE_MASK]( ctx, start, start + length, prim );

      }

   } while (tnl->Driver.Render.Multipass &&

	    tnl->Driver.Render.Multipass( ctx, ++pass ));

   tnl->Driver.Render.Finish( ctx );

   return GL_FALSE;		/* finished the pipe */

}

/**********************************************************************/

/*                          Render pipeline stage                     */

/**********************************************************************/

const struct tnl_pipeline_stage _tnl_render_stage =

{

   "render",			/* name */

   NULL,			/* private data */

   NULL,			/* creator */

   NULL,			/* destructor */

   NULL,			/* validate */

   run_render			/* run */

};