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

/*

 * Mesa 3-D graphics library

 * Version:  3.5

 *

 * 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.

 */

#include "glheader.h"

#include "colormac.h"

#include "light.h"

#include "macros.h"

#include "imports.h"

#include "mmath.h"

#include "simple_list.h"

#include "mtypes.h"

#include "math/m_translate.h"

#include "t_context.h"

#include "t_pipeline.h"

#define LIGHT_FLAGS         0x1 /* must be first */

#define LIGHT_TWOSIDE       0x2

#define LIGHT_COLORMATERIAL 0x4

#define MAX_LIGHT_FUNC      0x8

typedef void (*light_func)( GLcontext *ctx,

                            struct vertex_buffer *VB,

                            struct gl_pipeline_stage *stage,

                            GLvector4f *input );

struct light_stage_data {

   struct gl_client_array FloatColor;

   struct gl_client_array LitColor[2];

   struct gl_client_array LitSecondary[2];

   GLvector1ui LitIndex[2];

   light_func *light_func_tab;

};

#define LIGHT_STAGE_DATA(stage) ((struct light_stage_data *)(stage->privatePtr))

static void import_color_material( GLcontext *ctx,

                                   struct gl_pipeline_stage *stage )

{

   struct vertex_buffer *VB = &TNL_CONTEXT(ctx)->vb;

   struct gl_client_array *to = &LIGHT_STAGE_DATA(stage)->FloatColor;

   struct gl_client_array *from = VB->ColorPtr[0];

   GLuint count = VB->Count;

   if (!to->Ptr) {

      to->Ptr = ALIGN_MALLOC( VB->Size * 4 * sizeof(GLfloat), 32 );

      to->Type = GL_FLOAT;

   }

   /* No need to transform the same value 3000 times.

    */

   if (!from->StrideB) {

      to->StrideB = 0;

      count = 1;

   }

   else

      to->StrideB = 4 * sizeof(GLfloat);

   _math_trans_4f( (GLfloat (*)[4]) to->Ptr,

                   from->Ptr,

                   from->StrideB,

                   from->Type,

                   from->Size,

                   0,

                   count);

   VB->ColorPtr[0] = to;

}

/* Tables for all the shading functions.

 */

static light_func _tnl_light_tab[MAX_LIGHT_FUNC];

static light_func _tnl_light_fast_tab[MAX_LIGHT_FUNC];

static light_func _tnl_light_fast_single_tab[MAX_LIGHT_FUNC];

static light_func _tnl_light_spec_tab[MAX_LIGHT_FUNC];

static light_func _tnl_light_ci_tab[MAX_LIGHT_FUNC];

#define TAG(x)           x

#define IDX              (0)

#include "t_vb_lighttmp.h"

#define TAG(x)           x##_tw

#define IDX              (LIGHT_TWOSIDE)

#include "t_vb_lighttmp.h"

#define TAG(x)           x##_fl

#define IDX              (LIGHT_FLAGS)

#include "t_vb_lighttmp.h"

#define TAG(x)           x##_tw_fl

#define IDX              (LIGHT_FLAGS|LIGHT_TWOSIDE)

#include "t_vb_lighttmp.h"

#define TAG(x)           x##_cm

#define IDX              (LIGHT_COLORMATERIAL)

#include "t_vb_lighttmp.h"

#define TAG(x)           x##_tw_cm

#define IDX              (LIGHT_TWOSIDE|LIGHT_COLORMATERIAL)

#include "t_vb_lighttmp.h"

#define TAG(x)           x##_fl_cm

#define IDX              (LIGHT_FLAGS|LIGHT_COLORMATERIAL)

#include "t_vb_lighttmp.h"

#define TAG(x)           x##_tw_fl_cm

#define IDX              (LIGHT_FLAGS|LIGHT_TWOSIDE|LIGHT_COLORMATERIAL)

#include "t_vb_lighttmp.h"

static void init_lighting( void )

{

   static int done;

   if (!done) {

      init_light_tab();

      init_light_tab_tw();

      init_light_tab_fl();

      init_light_tab_tw_fl();

      init_light_tab_cm();

      init_light_tab_tw_cm();

      init_light_tab_fl_cm();

      init_light_tab_tw_fl_cm();

      done = 1;

   }

}

static GLboolean run_lighting( GLcontext *ctx, struct gl_pipeline_stage *stage )

{

   struct light_stage_data *store = LIGHT_STAGE_DATA(stage);

   TNLcontext *tnl = TNL_CONTEXT(ctx);

   struct vertex_buffer *VB = &tnl->vb;

   GLvector4f *input = ctx->_NeedEyeCoords ? VB->EyePtr : VB->ObjPtr;

   GLuint ind;

/*     _tnl_print_vert_flags( __FUNCTION__, stage->changed_inputs ); */

   /* Make sure we can talk about elements 0..2 in the vector we are

    * lighting.

    */

   if (stage->changed_inputs & (VERT_BIT_EYE|VERT_BIT_POS)) {

      if (input->size <= 2) {

         if (input->flags & VEC_NOT_WRITEABLE) {

            ASSERT(VB->importable_data & VERT_BIT_POS);

            VB->import_data( ctx, VERT_BIT_POS, VEC_NOT_WRITEABLE );

            input = ctx->_NeedEyeCoords ? VB->EyePtr : VB->ObjPtr;

            ASSERT((input->flags & VEC_NOT_WRITEABLE) == 0);

         }

         _mesa_vector4f_clean_elem(input, VB->Count, 2);

      }

   }

   if (VB->Flag)

      ind = LIGHT_FLAGS;

   else

      ind = 0;

   /* The individual functions know about replaying side-effects

    * vs. full re-execution.

    */

   store->light_func_tab[ind]( ctx, VB, stage, input );

   return GL_TRUE;

}

/* Called in place of do_lighting when the light table may have changed.

 */

static GLboolean run_validate_lighting( GLcontext *ctx,

                                        struct gl_pipeline_stage *stage )

{

   GLuint ind = 0;

   light_func *tab;

   if (ctx->Visual.rgbMode) {

      if (ctx->Light._NeedVertices) {

         if (ctx->Light.Model.ColorControl == GL_SEPARATE_SPECULAR_COLOR)

            tab = _tnl_light_spec_tab;

         else

            tab = _tnl_light_tab;

      }

      else {

         if (ctx->Light.EnabledList.next == ctx->Light.EnabledList.prev)

            tab = _tnl_light_fast_single_tab;

         else

            tab = _tnl_light_fast_tab;

      }

   }

   else

      tab = _tnl_light_ci_tab;

   if (ctx->Light.ColorMaterialEnabled)

      ind |= LIGHT_COLORMATERIAL;

   if (ctx->Light.Model.TwoSide)

      ind |= LIGHT_TWOSIDE;

   LIGHT_STAGE_DATA(stage)->light_func_tab = &tab[ind];

   /* This and the above should only be done on _NEW_LIGHT:

    */

   TNL_CONTEXT(ctx)->Driver.NotifyMaterialChange( ctx );

   /* Now run the stage...

    */

   stage->run = run_lighting;

   return stage->run( ctx, stage );

}

static void alloc_4chan( struct gl_client_array *a, GLuint sz )

{

   a->Ptr = ALIGN_MALLOC( sz * sizeof(GLchan) * 4, 32 );

   a->Size = 4;

   a->Type = CHAN_TYPE;

   a->Stride = 0;

   a->StrideB = sizeof(GLchan) * 4;

   a->Enabled = 0;

   a->Flags = 0;

}

/* Called the first time stage->run is called.  In effect, don't

 * allocate data until the first time the stage is run.

 */

static GLboolean run_init_lighting( GLcontext *ctx,

                                    struct gl_pipeline_stage *stage )

{

   TNLcontext *tnl = TNL_CONTEXT(ctx);

   struct light_stage_data *store;

   GLuint size = tnl->vb.Size;

   stage->privatePtr = MALLOC(sizeof(*store));

   store = LIGHT_STAGE_DATA(stage);

   if (!store)

      return GL_FALSE;

   /* Do onetime init.

    */

   init_lighting();

   store->FloatColor.Ptr = 0;

   alloc_4chan( &store->LitColor[0], size );

   alloc_4chan( &store->LitColor[1], size );

   alloc_4chan( &store->LitSecondary[0], size );

   alloc_4chan( &store->LitSecondary[1], size );

   _mesa_vector1ui_alloc( &store->LitIndex[0], 0, size, 32 );

   _mesa_vector1ui_alloc( &store->LitIndex[1], 0, size, 32 );

   /* Now validate the stage derived data...

    */

   stage->run = run_validate_lighting;

   return stage->run( ctx, stage );

}

/*

 * Check if lighting is enabled.  If so, configure the pipeline stage's

 * type, inputs, and outputs.

 */

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

{

   stage->active = ctx->Light.Enabled && !ctx->VertexProgram.Enabled;

   if (stage->active) {

      if (stage->privatePtr)

         stage->run = run_validate_lighting;

      stage->inputs = VERT_BIT_NORMAL|VERT_BIT_MATERIAL;

      if (ctx->Light._NeedVertices)

         stage->inputs |= VERT_BIT_EYE; /* effectively, even when lighting in obj */

      if (ctx->Light.ColorMaterialEnabled)

         stage->inputs |= VERT_BIT_COLOR0;

      stage->outputs = VERT_BIT_COLOR0;

      if (ctx->Light.Model.ColorControl == GL_SEPARATE_SPECULAR_COLOR)

         stage->outputs |= VERT_BIT_COLOR1;

   }

}

static void dtr( struct gl_pipeline_stage *stage )

{

   struct light_stage_data *store = LIGHT_STAGE_DATA(stage);

   if (store) {

      ALIGN_FREE( store->LitColor[0].Ptr );

      ALIGN_FREE( store->LitColor[1].Ptr );

      ALIGN_FREE( store->LitSecondary[0].Ptr );

      ALIGN_FREE( store->LitSecondary[1].Ptr );

      if (store->FloatColor.Ptr)

         ALIGN_FREE( store->FloatColor.Ptr );

      _mesa_vector1ui_free( &store->LitIndex[0] );

      _mesa_vector1ui_free( &store->LitIndex[1] );

      FREE( store );

      stage->privatePtr = 0;

   }

}

const struct gl_pipeline_stage _tnl_lighting_stage =

{

   "lighting",                  /* name */

   _NEW_LIGHT,                  /* recheck */

   _NEW_LIGHT|_NEW_MODELVIEW,   /* recalc -- modelview dependency

                                 * otherwise not captured by inputs

                                 * (which may be VERT_BIT_POS) */

   GL_FALSE,                    /* active? */

   0,                           /* inputs */

   0,                           /* outputs */

   0,                           /* changed_inputs */

   NULL,                        /* private_data */

   dtr,                         /* destroy */

   check_lighting,              /* check */

   run_init_lighting            /* run -- initially set to ctr */

};