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      1 /*
      2  * Mesa 3-D graphics library
      3  * Version:  7.1
      4  *
      5  * Copyright (C) 1999-2007  Brian Paul   All Rights Reserved.
      6  *
      7  * Permission is hereby granted, free of charge, to any person obtaining a
      8  * copy of this software and associated documentation files (the "Software"),
      9  * to deal in the Software without restriction, including without limitation
     10  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
     11  * and/or sell copies of the Software, and to permit persons to whom the
     12  * Software is furnished to do so, subject to the following conditions:
     13  *
     14  * The above copyright notice and this permission notice shall be included
     15  * in all copies or substantial portions of the Software.
     16  *
     17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
     18  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
     19  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
     20  * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
     21  * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
     22  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
     23  *
     24  * Authors:
     25  *    Keith Whitwell <keith (at) tungstengraphics.com>
     26  */
     27 
     28 #include "main/glheader.h"
     29 #include "main/imports.h"
     30 #include "main/colormac.h"
     31 #include "tnl/tnl.h"
     32 #include "tnl/t_context.h"
     33 #include "tnl/t_pipeline.h"
     34 #include "tnl/t_vertex.h"
     35 #include "swrast_setup.h"
     36 #include "ss_context.h"
     37 #include "ss_triangle.h"
     38 
     39 
     40 /* Need to check lighting state and vertex program state to know
     41  * if two-sided lighting is in effect.
     42  */
     43 #define _SWSETUP_NEW_RENDERINDEX (_NEW_POLYGON|_NEW_LIGHT|_NEW_PROGRAM)
     44 
     45 
     46 #define VARYING_EMIT_STYLE  EMIT_4F
     47 
     48 
     49 GLboolean
     50 _swsetup_CreateContext( struct gl_context *ctx )
     51 {
     52    SScontext *swsetup = (SScontext *)CALLOC(sizeof(SScontext));
     53 
     54    if (!swsetup)
     55       return GL_FALSE;
     56 
     57    ctx->swsetup_context = swsetup;
     58 
     59    swsetup->NewState = ~0;
     60    _swsetup_trifuncs_init( ctx );
     61 
     62    _tnl_init_vertices( ctx, ctx->Const.MaxArrayLockSize + 12,
     63 		       sizeof(SWvertex) );
     64 
     65 
     66    return GL_TRUE;
     67 }
     68 
     69 void
     70 _swsetup_DestroyContext( struct gl_context *ctx )
     71 {
     72    SScontext *swsetup = SWSETUP_CONTEXT(ctx);
     73 
     74    if (swsetup) {
     75       FREE(swsetup);
     76       ctx->swsetup_context = 0;
     77    }
     78 
     79    _tnl_free_vertices( ctx );
     80 }
     81 
     82 static void
     83 _swsetup_RenderPrimitive( struct gl_context *ctx, GLenum mode )
     84 {
     85    SWSETUP_CONTEXT(ctx)->render_prim = mode;
     86    _swrast_render_primitive( ctx, mode );
     87 }
     88 
     89 
     90 /**
     91  * Helper macros for setup_vertex_format()
     92  */
     93 #define SWZ ((SWvertex *)0)
     94 #define SWOffset(MEMBER) (((char *)&(SWZ->MEMBER)) - ((char *)SWZ))
     95 
     96 #define EMIT_ATTR( ATTR, STYLE, MEMBER )	\
     97 do {						\
     98    map[e].attrib = (ATTR);			\
     99    map[e].format = (STYLE);			\
    100    map[e].offset = SWOffset(MEMBER);	       	\
    101    e++;						\
    102 } while (0)
    103 
    104 
    105 /**
    106  * Tell the tnl module how to build SWvertex objects for swrast.
    107  * We'll build the map[] array with that info and pass it to
    108  * _tnl_install_attrs().
    109  */
    110 static void
    111 setup_vertex_format(struct gl_context *ctx)
    112 {
    113    TNLcontext *tnl = TNL_CONTEXT(ctx);
    114    SScontext *swsetup = SWSETUP_CONTEXT(ctx);
    115    GLboolean intColors = !ctx->FragmentProgram._Current
    116                       && !ctx->ATIFragmentShader._Enabled
    117                       && ctx->RenderMode == GL_RENDER
    118                       && CHAN_TYPE != GL_FLOAT;
    119 
    120    if (intColors != swsetup->intColors ||
    121        tnl->render_inputs_bitset != swsetup->last_index_bitset) {
    122       GLbitfield64 index_bitset = tnl->render_inputs_bitset;
    123       struct tnl_attr_map map[_TNL_ATTRIB_MAX];
    124       unsigned int i, e = 0;
    125 
    126       swsetup->intColors = intColors;
    127 
    128       EMIT_ATTR( _TNL_ATTRIB_POS, EMIT_4F_VIEWPORT, attrib[FRAG_ATTRIB_WPOS] );
    129 
    130       if (index_bitset & BITFIELD64_BIT(_TNL_ATTRIB_COLOR0)) {
    131          if (swsetup->intColors)
    132             EMIT_ATTR( _TNL_ATTRIB_COLOR0, EMIT_4CHAN_4F_RGBA, color );
    133          else
    134             EMIT_ATTR( _TNL_ATTRIB_COLOR0, EMIT_4F, attrib[FRAG_ATTRIB_COL0]);
    135       }
    136 
    137       if (index_bitset & BITFIELD64_BIT(_TNL_ATTRIB_COLOR1)) {
    138          EMIT_ATTR( _TNL_ATTRIB_COLOR1, EMIT_4F, attrib[FRAG_ATTRIB_COL1]);
    139       }
    140 
    141       if (index_bitset & BITFIELD64_BIT(_TNL_ATTRIB_FOG)) {
    142          const GLint emit = ctx->FragmentProgram._Current ? EMIT_4F : EMIT_1F;
    143          EMIT_ATTR( _TNL_ATTRIB_FOG, emit, attrib[FRAG_ATTRIB_FOGC]);
    144       }
    145 
    146       if (index_bitset & BITFIELD64_RANGE(_TNL_ATTRIB_TEX0, _TNL_NUM_TEX))
    147       {
    148          for (i = 0; i < MAX_TEXTURE_COORD_UNITS; i++) {
    149             if (index_bitset & BITFIELD64_BIT(_TNL_ATTRIB_TEX(i))) {
    150                EMIT_ATTR( _TNL_ATTRIB_TEX(i), EMIT_4F,
    151                           attrib[FRAG_ATTRIB_TEX0 + i] );
    152             }
    153          }
    154       }
    155 
    156       /* shader varying vars */
    157       if (index_bitset & BITFIELD64_RANGE(_TNL_ATTRIB_GENERIC0, _TNL_NUM_GENERIC)) {
    158          for (i = 0; i < ctx->Const.MaxVarying; i++) {
    159             if (index_bitset & BITFIELD64_BIT(_TNL_ATTRIB_GENERIC(i))) {
    160                EMIT_ATTR( _TNL_ATTRIB_GENERIC(i), VARYING_EMIT_STYLE,
    161                           attrib[FRAG_ATTRIB_VAR0 + i] );
    162             }
    163          }
    164       }
    165 
    166       if (index_bitset & BITFIELD64_BIT(_TNL_ATTRIB_POINTSIZE))
    167          EMIT_ATTR( _TNL_ATTRIB_POINTSIZE, EMIT_1F, pointSize );
    168 
    169       _tnl_install_attrs( ctx, map, e,
    170                           ctx->Viewport._WindowMap.m,
    171                           sizeof(SWvertex) );
    172 
    173       swsetup->last_index_bitset = index_bitset;
    174    }
    175 }
    176 
    177 
    178 /**
    179  * Prepare to render a vertex buffer.
    180  * Called via tnl->Driver.Render.Start.
    181  */
    182 static void
    183 _swsetup_RenderStart( struct gl_context *ctx )
    184 {
    185    SScontext *swsetup = SWSETUP_CONTEXT(ctx);
    186    TNLcontext *tnl = TNL_CONTEXT(ctx);
    187    struct vertex_buffer *VB = &tnl->vb;
    188 
    189    if (swsetup->NewState & _SWSETUP_NEW_RENDERINDEX) {
    190       _swsetup_choose_trifuncs(ctx);
    191    }
    192 
    193    if (swsetup->NewState & _NEW_PROGRAM) {
    194       swsetup->last_index_bitset = 0;
    195    }
    196 
    197    swsetup->NewState = 0;
    198 
    199    /* This will change if drawing unfilled tris */
    200    _swrast_SetFacing(ctx, 0);
    201 
    202    _swrast_render_start(ctx);
    203 
    204    /* Important */
    205    VB->AttribPtr[VERT_ATTRIB_POS] = VB->NdcPtr;
    206 
    207    setup_vertex_format(ctx);
    208 }
    209 
    210 
    211 /*
    212  * We patch this function into tnl->Driver.Render.Finish.
    213  * It's called when we finish rendering a vertex buffer.
    214  */
    215 static void
    216 _swsetup_RenderFinish( struct gl_context *ctx )
    217 {
    218    _swrast_render_finish( ctx );
    219 }
    220 
    221 void
    222 _swsetup_InvalidateState( struct gl_context *ctx, GLuint new_state )
    223 {
    224    SScontext *swsetup = SWSETUP_CONTEXT(ctx);
    225    swsetup->NewState |= new_state;
    226    _tnl_invalidate_vertex_state( ctx, new_state );
    227 }
    228 
    229 
    230 void
    231 _swsetup_Wakeup( struct gl_context *ctx )
    232 {
    233    TNLcontext *tnl = TNL_CONTEXT(ctx);
    234    SScontext *swsetup = SWSETUP_CONTEXT(ctx);
    235 
    236    tnl->Driver.Render.Start = _swsetup_RenderStart;
    237    tnl->Driver.Render.Finish = _swsetup_RenderFinish;
    238    tnl->Driver.Render.PrimitiveNotify = _swsetup_RenderPrimitive;
    239    tnl->Driver.Render.Interp = _tnl_interp;
    240    tnl->Driver.Render.CopyPV = _tnl_copy_pv;
    241    tnl->Driver.Render.ClippedPolygon = _tnl_RenderClippedPolygon; /* new */
    242    tnl->Driver.Render.ClippedLine = _tnl_RenderClippedLine; /* new */
    243    /* points */
    244    /* line */
    245    /* triangle */
    246    /* quad */
    247    tnl->Driver.Render.PrimTabVerts = _tnl_render_tab_verts;
    248    tnl->Driver.Render.PrimTabElts = _tnl_render_tab_elts;
    249    tnl->Driver.Render.ResetLineStipple = _swrast_ResetLineStipple;
    250    tnl->Driver.Render.BuildVertices = _tnl_build_vertices;
    251    tnl->Driver.Render.Multipass = 0;
    252 
    253    _tnl_invalidate_vertices( ctx, ~0 );
    254    _tnl_need_projected_coords( ctx, GL_TRUE );
    255    _swsetup_InvalidateState( ctx, ~0 );
    256 
    257    swsetup->verts = (SWvertex *)tnl->clipspace.vertex_buf;
    258    swsetup->last_index_bitset = 0;
    259 }
    260 
    261 
    262 /**
    263  * Populate a swrast SWvertex from an attrib-style vertex.
    264  */
    265 void
    266 _swsetup_Translate( struct gl_context *ctx, const void *vertex, SWvertex *dest )
    267 {
    268    const GLfloat *m = ctx->Viewport._WindowMap.m;
    269    GLfloat tmp[4];
    270    GLuint i;
    271 
    272    _tnl_get_attr( ctx, vertex, _TNL_ATTRIB_POS, tmp );
    273 
    274    dest->attrib[FRAG_ATTRIB_WPOS][0] = m[0]  * tmp[0] + m[12];
    275    dest->attrib[FRAG_ATTRIB_WPOS][1] = m[5]  * tmp[1] + m[13];
    276    dest->attrib[FRAG_ATTRIB_WPOS][2] = m[10] * tmp[2] + m[14];
    277    dest->attrib[FRAG_ATTRIB_WPOS][3] =         tmp[3];
    278 
    279    /** XXX try to limit these loops someday */
    280    for (i = 0 ; i < ctx->Const.MaxTextureCoordUnits ; i++)
    281       _tnl_get_attr( ctx, vertex, _TNL_ATTRIB_TEX0 + i,
    282                      dest->attrib[FRAG_ATTRIB_TEX0 + i] );
    283 
    284    for (i = 0 ; i < ctx->Const.MaxVarying ; i++)
    285       _tnl_get_attr( ctx, vertex, _TNL_ATTRIB_GENERIC0 + i,
    286                      dest->attrib[FRAG_ATTRIB_VAR0 + i] );
    287 
    288    _tnl_get_attr( ctx, vertex, _TNL_ATTRIB_COLOR0,
    289                   dest->attrib[FRAG_ATTRIB_COL0] );
    290    UNCLAMPED_FLOAT_TO_RGBA_CHAN( dest->color, tmp );
    291 
    292    _tnl_get_attr( ctx, vertex, _TNL_ATTRIB_COLOR1,
    293                   dest->attrib[FRAG_ATTRIB_COL1]);
    294 
    295    _tnl_get_attr( ctx, vertex, _TNL_ATTRIB_FOG, tmp );
    296    dest->attrib[FRAG_ATTRIB_FOGC][0] = tmp[0];
    297 
    298    /* XXX See _tnl_get_attr about pointsize ... */
    299    _tnl_get_attr( ctx, vertex, _TNL_ATTRIB_POINTSIZE, tmp );
    300    dest->pointSize = tmp[0];
    301 }
    302 
    303