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/*

 * Mesa 3-D graphics library

 *

 * Copyright (C) 1999-2007  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 

 */

#include "main/glheader.h"

#include "main/imports.h"

#include "main/macros.h"

#include "tnl/tnl.h"

#include "tnl/t_context.h"

#include "tnl/t_pipeline.h"

#include "tnl/t_vertex.h"

#include "swrast_setup.h"

#include "ss_context.h"

#include "ss_triangle.h"

/* Need to check lighting state and vertex program state to know

 * if two-sided lighting is in effect.

 */

#define _SWSETUP_NEW_RENDERINDEX (_NEW_POLYGON|_NEW_LIGHT|_NEW_PROGRAM)

#define VARYING_EMIT_STYLE  EMIT_4F

GLboolean

_swsetup_CreateContext( struct gl_context *ctx )

{

   SScontext *swsetup = calloc(1, sizeof(SScontext));

   if (!swsetup)

      return GL_FALSE;

   ctx->swsetup_context = swsetup;

   swsetup->NewState = ~0;

   _swsetup_trifuncs_init( ctx );

   _tnl_init_vertices( ctx, ctx->Const.MaxArrayLockSize + 12,

		       sizeof(SWvertex) );

   return GL_TRUE;

}

void

_swsetup_DestroyContext( struct gl_context *ctx )

{

   SScontext *swsetup = SWSETUP_CONTEXT(ctx);

   if (swsetup) {

      free(swsetup);

      ctx->swsetup_context = 0;

   }

   _tnl_free_vertices( ctx );

}

static void

_swsetup_RenderPrimitive( struct gl_context *ctx, GLenum mode )

{

   SWSETUP_CONTEXT(ctx)->render_prim = mode;

   _swrast_render_primitive( ctx, mode );

}

/**

 * Helper macros for setup_vertex_format()

 */

#define SWZ ((SWvertex *)0)

#define SWOffset(MEMBER) (((char *)&(SWZ->MEMBER)) - ((char *)SWZ))

#define EMIT_ATTR( ATTR, STYLE, MEMBER )	\

do {						\

   map[e].attrib = (ATTR);			\

   map[e].format = (STYLE);			\

   map[e].offset = SWOffset(MEMBER);	       	\

   e++;						\

} while (0)

/**

 * Tell the tnl module how to build SWvertex objects for swrast.

 * We'll build the map[] array with that info and pass it to

 * _tnl_install_attrs().

 */

static void

setup_vertex_format(struct gl_context *ctx)

{

   TNLcontext *tnl = TNL_CONTEXT(ctx);

   SScontext *swsetup = SWSETUP_CONTEXT(ctx);

   GLboolean intColors = !ctx->FragmentProgram._Current

                      && !ctx->ATIFragmentShader._Enabled

                      && ctx->RenderMode == GL_RENDER

                      && CHAN_TYPE != GL_FLOAT;

   if (intColors != swsetup->intColors ||

       tnl->render_inputs_bitset != swsetup->last_index_bitset) {

      GLbitfield64 index_bitset = tnl->render_inputs_bitset;

      struct tnl_attr_map map[_TNL_ATTRIB_MAX];

      unsigned int i, e = 0;

      swsetup->intColors = intColors;

      EMIT_ATTR( _TNL_ATTRIB_POS, EMIT_4F_VIEWPORT, attrib[VARYING_SLOT_POS] );

      if (index_bitset & BITFIELD64_BIT(_TNL_ATTRIB_COLOR0)) {

         if (swsetup->intColors)

            EMIT_ATTR( _TNL_ATTRIB_COLOR0, EMIT_4CHAN_4F_RGBA, color );

         else

            EMIT_ATTR( _TNL_ATTRIB_COLOR0, EMIT_4F, attrib[VARYING_SLOT_COL0]);

      }

      if (index_bitset & BITFIELD64_BIT(_TNL_ATTRIB_COLOR1)) {

         EMIT_ATTR( _TNL_ATTRIB_COLOR1, EMIT_4F, attrib[VARYING_SLOT_COL1]);

      }

      if (index_bitset & BITFIELD64_BIT(_TNL_ATTRIB_FOG)) {

         const GLint emit = ctx->FragmentProgram._Current ? EMIT_4F : EMIT_1F;

         EMIT_ATTR( _TNL_ATTRIB_FOG, emit, attrib[VARYING_SLOT_FOGC]);

      }

      if (index_bitset & BITFIELD64_RANGE(_TNL_ATTRIB_TEX0, _TNL_NUM_TEX))

      {

         for (i = 0; i < MAX_TEXTURE_COORD_UNITS; i++) {

            if (index_bitset & BITFIELD64_BIT(_TNL_ATTRIB_TEX(i))) {

               EMIT_ATTR( _TNL_ATTRIB_TEX(i), EMIT_4F,

                          attrib[VARYING_SLOT_TEX0 + i] );

            }

         }

      }

      /* shader varying vars */

      if (index_bitset & BITFIELD64_RANGE(_TNL_ATTRIB_GENERIC0, _TNL_NUM_GENERIC)) {

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

            if (index_bitset & BITFIELD64_BIT(_TNL_ATTRIB_GENERIC(i))) {

               EMIT_ATTR( _TNL_ATTRIB_GENERIC(i), VARYING_EMIT_STYLE,

                          attrib[VARYING_SLOT_VAR0 + i] );

            }

         }

      }

      if (index_bitset & BITFIELD64_BIT(_TNL_ATTRIB_POINTSIZE))

         EMIT_ATTR( _TNL_ATTRIB_POINTSIZE, EMIT_1F, pointSize );

      _tnl_install_attrs( ctx, map, e,

                          tnl->_WindowMap.m,

                          sizeof(SWvertex) );

      swsetup->last_index_bitset = index_bitset;

   }

}

/**

 * Prepare to render a vertex buffer.

 * Called via tnl->Driver.Render.Start.

 */

static void

_swsetup_RenderStart( struct gl_context *ctx )

{

   SScontext *swsetup = SWSETUP_CONTEXT(ctx);

   TNLcontext *tnl = TNL_CONTEXT(ctx);

   struct vertex_buffer *VB = &tnl->vb;

   if (swsetup->NewState & _SWSETUP_NEW_RENDERINDEX) {

      _swsetup_choose_trifuncs(ctx);

   }

   if (swsetup->NewState & _NEW_PROGRAM) {

      swsetup->last_index_bitset = 0;

   }

   swsetup->NewState = 0;

   /* This will change if drawing unfilled tris */

   _swrast_SetFacing(ctx, 0);

   _swrast_render_start(ctx);

   /* Important */

   VB->AttribPtr[VERT_ATTRIB_POS] = VB->NdcPtr;

   setup_vertex_format(ctx);

}

/*

 * We patch this function into tnl->Driver.Render.Finish.

 * It's called when we finish rendering a vertex buffer.

 */

static void

_swsetup_RenderFinish( struct gl_context *ctx )

{

   _swrast_render_finish( ctx );

}

void

_swsetup_InvalidateState( struct gl_context *ctx, GLuint new_state )

{

   SScontext *swsetup = SWSETUP_CONTEXT(ctx);

   swsetup->NewState |= new_state;

   _tnl_invalidate_vertex_state( ctx, new_state );

}

void

_swsetup_Wakeup( struct gl_context *ctx )

{

   TNLcontext *tnl = TNL_CONTEXT(ctx);

   SScontext *swsetup = SWSETUP_CONTEXT(ctx);

   tnl->Driver.Render.Start = _swsetup_RenderStart;

   tnl->Driver.Render.Finish = _swsetup_RenderFinish;

   tnl->Driver.Render.PrimitiveNotify = _swsetup_RenderPrimitive;

   tnl->Driver.Render.Interp = _tnl_interp;

   tnl->Driver.Render.CopyPV = _tnl_copy_pv;

   tnl->Driver.Render.ClippedPolygon = _tnl_RenderClippedPolygon; /* new */

   tnl->Driver.Render.ClippedLine = _tnl_RenderClippedLine; /* new */

   /* points */

   /* line */

   /* triangle */

   /* quad */

   tnl->Driver.Render.PrimTabVerts = _tnl_render_tab_verts;

   tnl->Driver.Render.PrimTabElts = _tnl_render_tab_elts;

   tnl->Driver.Render.ResetLineStipple = _swrast_ResetLineStipple;

   tnl->Driver.Render.BuildVertices = _tnl_build_vertices;

   tnl->Driver.Render.Multipass = 0;

   _tnl_invalidate_vertices( ctx, ~0 );

   _tnl_need_projected_coords( ctx, GL_TRUE );

   _swsetup_InvalidateState( ctx, ~0 );

   swsetup->verts = (SWvertex *)tnl->clipspace.vertex_buf;

   swsetup->last_index_bitset = 0;

}

/**

 * Populate a swrast SWvertex from an attrib-style vertex.

 */

void

_swsetup_Translate( struct gl_context *ctx, const void *vertex, SWvertex *dest )

{

   TNLcontext *tnl = TNL_CONTEXT(ctx);

   const GLfloat *m = tnl->_WindowMap.m;

   GLfloat tmp[4];

   GLuint i;

   _tnl_get_attr( ctx, vertex, _TNL_ATTRIB_POS, tmp );

   dest->attrib[VARYING_SLOT_POS][0] = m[0]  * tmp[0] + m[12];

   dest->attrib[VARYING_SLOT_POS][1] = m[5]  * tmp[1] + m[13];

   dest->attrib[VARYING_SLOT_POS][2] = m[10] * tmp[2] + m[14];

   dest->attrib[VARYING_SLOT_POS][3] =         tmp[3];

   /** XXX try to limit these loops someday */

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

      _tnl_get_attr( ctx, vertex, _TNL_ATTRIB_TEX0 + i,

                     dest->attrib[VARYING_SLOT_TEX0 + i] );

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

      _tnl_get_attr( ctx, vertex, _TNL_ATTRIB_GENERIC0 + i,

                     dest->attrib[VARYING_SLOT_VAR0 + i] );

   _tnl_get_attr( ctx, vertex, _TNL_ATTRIB_COLOR0,

                  dest->attrib[VARYING_SLOT_COL0] );

   UNCLAMPED_FLOAT_TO_RGBA_CHAN(dest->color, dest->attrib[VARYING_SLOT_COL0]);

   _tnl_get_attr( ctx, vertex, _TNL_ATTRIB_COLOR1,

                  dest->attrib[VARYING_SLOT_COL1]);

   _tnl_get_attr( ctx, vertex, _TNL_ATTRIB_FOG, tmp );

   dest->attrib[VARYING_SLOT_FOGC][0] = tmp[0];

   /* XXX See _tnl_get_attr about pointsize ... */

   _tnl_get_attr( ctx, vertex, _TNL_ATTRIB_POINTSIZE, tmp );

   dest->pointSize = tmp[0];

}