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/* $Id: t_vb_render.c,v 1.1 2003-02-28 11:48:07 pj Exp $ */

/*

 * Mesa 3-D graphics library

 * Version:  4.0.1

 *

 * Copyright (C) 1999-2001  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 <keith@tungstengraphics.com>

 */

/*

 * 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 "glheader.h"

#include "context.h"

#include "enums.h"

#include "macros.h"

#include "imports.h"

#include "mtypes.h"

#include "mmath.h"

#include "math/m_matrix.h"

#include "math/m_xform.h"

#include "t_pipeline.h"

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

/*                        Clip single primitives                      */

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

#if defined(USE_IEEE)

#define NEGATIVE(x) (GET_FLOAT_BITS(x) & (1<<31))

#define DIFFERENT_SIGNS(x,y) ((GET_FLOAT_BITS(x) ^ GET_FLOAT_BITS(y)) & (1<<31))

#else

#define NEGATIVE(x) (x < 0)

#define DIFFERENT_SIGNS(x,y) (x * y <= 0 && x - y != 0)

/* Could just use (x*y<0) except for the flatshading requirements.

 * Maybe there's a better way?

 */

#endif

#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->_TriangleCaps & DD_TRI_UNFILLED)

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

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

/* 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 & 0x3f))                  \

      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 & 0x3f))                     \

      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 & 0x3f))                \

      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 line_func LineFunc = tnl->Driver.Render.Line;          \

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

   const 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 RESET_OCCLUSION ctx->OcclusionResult = GL_TRUE

#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( GLcontext *ctx,

                                GLuint start,

                                GLuint count,

                                GLuint flags )

{

   TNLcontext *tnl = TNL_CONTEXT(ctx);

   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&0x3f))

            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->_TriangleCaps & DD_TRI_UNFILLED)

#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 line_func LineFunc = tnl->Driver.Render.Line;          \

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

   const 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 RESET_OCCLUSION ctx->OcclusionResult = GL_TRUE

#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( GLcontext *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( GLcontext *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( GLcontext *ctx,

                             struct gl_pipeline_stage *stage )

{

   TNLcontext *tnl = TNL_CONTEXT(ctx);

   struct vertex_buffer *VB = &tnl->vb;

   GLuint new_inputs = stage->changed_inputs;

   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, new_inputs );

   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, length, flags = 0;

      for (i = VB->FirstPrimitive ; !(flags & PRIM_LAST) ; i += length)

      {

         flags = VB->Primitive[i];

         length= VB->PrimitiveLength[i];

         ASSERT(length || (flags & PRIM_LAST));

         ASSERT((flags & PRIM_MODE_MASK) <= GL_POLYGON+1);

         if (MESA_VERBOSE & VERBOSE_PRIMS)

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

                    _mesa_lookup_enum_by_nr(flags & PRIM_MODE_MASK),

                    i, i+length);

         if (length)

            tab[flags & PRIM_MODE_MASK]( ctx, i, i + length, flags );

      }

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

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

   tnl->Driver.Render.Finish( ctx );

/*     _swrast_flush(ctx); */

/*     usleep(1000000); */

   return GL_FALSE;             /* finished the pipe */

}

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

/*                          Render pipeline stage                     */

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

/* Quite a bit of work involved in finding out the inputs for the

 * render stage.

 */

static void check_render( GLcontext *ctx, struct gl_pipeline_stage *stage )

{

   GLuint inputs = VERT_BIT_CLIP;

   GLuint i;

   if (ctx->Visual.rgbMode) {

      inputs |= VERT_BIT_COLOR0;

      if (ctx->_TriangleCaps & DD_SEPARATE_SPECULAR)

         inputs |= VERT_BIT_COLOR1;

      if (ctx->Texture._EnabledUnits) {

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

            if (ctx->Texture.Unit[i]._ReallyEnabled)

               inputs |= VERT_BIT_TEX(i);

         }

      }

   }

   else {

      inputs |= VERT_BIT_INDEX;

   }

   if (ctx->Point._Attenuated)

      inputs |= VERT_BIT_POINT_SIZE;

   /* How do drivers turn this off?

    */

   if (ctx->Fog.Enabled)

      inputs |= VERT_BIT_FOG;

   if (ctx->_TriangleCaps & DD_TRI_UNFILLED)

      inputs |= VERT_BIT_EDGEFLAG;

   if (ctx->RenderMode==GL_FEEDBACK)

      inputs |= VERT_BITS_TEX_ANY;

   stage->inputs = inputs;

}

static void dtr( struct gl_pipeline_stage *stage )

{

}

const struct gl_pipeline_stage _tnl_render_stage =

{

   "render",                    /* name */

   (_NEW_BUFFERS |

    _DD_NEW_SEPARATE_SPECULAR |

    _DD_NEW_FLATSHADE |

    _NEW_TEXTURE|

    _NEW_LIGHT|

    _NEW_POINT|

    _NEW_FOG|

    _DD_NEW_TRI_UNFILLED |

    _NEW_RENDERMODE),           /* re-check (new inputs, interp function) */

   0,                           /* re-run (always runs) */

   GL_TRUE,                     /* active? */

   0,                           /* inputs (set in check_render) */

   0,                           /* outputs */

   0,                           /* changed_inputs */

   NULL,                        /* private data */

   dtr,                         /* destructor */

   check_render,                /* check */

   run_render                   /* run */

};