src/mesa/swrast_setup/ss_triangle.c

   1 /* $Id: ss_triangle.c,v 1.19 2002/10/29 20:29:00 brianp Exp $ */
   2
   3 /*
   4  * Mesa 3-D graphics library
   5  * Version:  3.5
   6  *
   7  * Copyright (C) 1999-2001  Brian Paul   All Rights Reserved.
   8  *
   9  * Permission is hereby granted, free of charge, to any person obtaining a
  10  * copy of this software and associated documentation files (the "Software"),
  11  * to deal in the Software without restriction, including without limitation
  12  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  13  * and/or sell copies of the Software, and to permit persons to whom the
  14  * Software is furnished to do so, subject to the following conditions:
  15  *
  16  * The above copyright notice and this permission notice shall be included
  17  * in all copies or substantial portions of the Software.
  18  *
  19  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  20  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  21  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  22  * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  23  * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  24  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25  *
  26  * Authors:
  27  *    Keith Whitwell <keith@tungstengraphics.com>
  28  */
  29
  30 #include "glheader.h"
  31 #include "colormac.h"
  32 #include "macros.h"
  33 #include "mtypes.h"
  34
  35 #include "tnl/t_context.h"
  36
  37 #include "ss_triangle.h"
  38 #include "ss_context.h"
  39
  40 #define SS_RGBA_BIT         0x1
  41 #define SS_OFFSET_BIT       0x2
  42 #define SS_TWOSIDE_BIT      0x4
  43 #define SS_UNFILLED_BIT     0x8
  44 #define SS_MAX_TRIFUNC      0x10
  45
  46 static triangle_func tri_tab[SS_MAX_TRIFUNC];
  47 static quad_func     quad_tab[SS_MAX_TRIFUNC];
  48
  49
  50 static void _swsetup_render_line_tri( GLcontext *ctx,
  51                                       GLuint e0, GLuint e1, GLuint e2 )
  52 {
  53    SScontext *swsetup = SWSETUP_CONTEXT(ctx);
  54    struct vertex_buffer *VB = &TNL_CONTEXT(ctx)->vb;
  55    GLubyte *ef = VB->EdgeFlag;
  56    SWvertex *verts = swsetup->verts;
  57    SWvertex *v0 = &verts[e0];
  58    SWvertex *v1 = &verts[e1];
  59    SWvertex *v2 = &verts[e2];
  60    GLchan c[2][4];
  61    GLchan s[2][4];
  62    GLuint i[2];
  63
  64    if (ctx->_TriangleCaps & DD_FLATSHADE) {
  65       COPY_CHAN4(c[0], v0->color);
  66       COPY_CHAN4(c[1], v1->color);
  67       COPY_CHAN4(s[0], v0->specular);
  68       COPY_CHAN4(s[1], v1->specular);
  69       i[0] = v0->index;
  70       i[1] = v1->index;
  71
  72       COPY_CHAN4(v0->color, v2->color);
  73       COPY_CHAN4(v1->color, v2->color);
  74       COPY_CHAN4(v0->specular, v2->specular);
  75       COPY_CHAN4(v1->specular, v2->specular);
  76       v0->index = v2->index;
  77       v1->index = v2->index;
  78    }
  79
  80    if (swsetup->render_prim == GL_POLYGON) {
  81       if (ef[e2]) _swrast_Line( ctx, v2, v0 );
  82       if (ef[e0]) _swrast_Line( ctx, v0, v1 );
  83       if (ef[e1]) _swrast_Line( ctx, v1, v2 );
  84    } else {
  85       if (ef[e0]) _swrast_Line( ctx, v0, v1 );
  86       if (ef[e1]) _swrast_Line( ctx, v1, v2 );
  87       if (ef[e2]) _swrast_Line( ctx, v2, v0 );
  88    }
  89
  90    if (ctx->_TriangleCaps & DD_FLATSHADE) {
  91       COPY_CHAN4(v0->color, c[0]);
  92       COPY_CHAN4(v1->color, c[1]);
  93       COPY_CHAN4(v0->specular, s[0]);
  94       COPY_CHAN4(v1->specular, s[1]);
  95       v0->index = i[0];
  96       v1->index = i[1];
  97    }
  98 }
  99
 100 static void _swsetup_render_point_tri( GLcontext *ctx,
 101                                        GLuint e0, GLuint e1, GLuint e2 )
 102 {
 103    SScontext *swsetup = SWSETUP_CONTEXT(ctx);
 104    struct vertex_buffer *VB = &TNL_CONTEXT(ctx)->vb;
 105    GLubyte *ef = VB->EdgeFlag;
 106    SWvertex *verts = swsetup->verts;
 107    SWvertex *v0 = &verts[e0];
 108    SWvertex *v1 = &verts[e1];
 109    SWvertex *v2 = &verts[e2];
 110    GLchan c[2][4];
 111    GLchan s[2][4];
 112    GLuint i[2];
 113
 114    if (ctx->_TriangleCaps & DD_FLATSHADE) {
 115       COPY_CHAN4(c[0], v0->color);
 116       COPY_CHAN4(c[1], v1->color);
 117       COPY_CHAN4(s[0], v0->specular);
 118       COPY_CHAN4(s[1], v1->specular);
 119       i[0] = v0->index;
 120       i[1] = v1->index;
 121
 122       COPY_CHAN4(v0->color, v2->color);
 123       COPY_CHAN4(v1->color, v2->color);
 124       COPY_CHAN4(v0->specular, v2->specular);
 125       COPY_CHAN4(v1->specular, v2->specular);
 126       v0->index = v2->index;
 127       v1->index = v2->index;
 128    }
 129
 130    if (ef[e0]) _swrast_Point( ctx, v0 );
 131    if (ef[e1]) _swrast_Point( ctx, v1 );
 132    if (ef[e2]) _swrast_Point( ctx, v2 );
 133
 134    if (ctx->_TriangleCaps & DD_FLATSHADE) {
 135       COPY_CHAN4(v0->color, c[0]);
 136       COPY_CHAN4(v1->color, c[1]);
 137       COPY_CHAN4(v0->specular, s[0]);
 138       COPY_CHAN4(v1->specular, s[1]);
 139       v0->index = i[0];
 140       v1->index = i[1];
 141    }
 142    _swrast_flush(ctx);
 143 }
 144
 145 #define SS_COLOR(a,b) COPY_CHAN4(a,b)
 146 #define SS_SPEC(a,b) COPY_3V(a,b)
 147 #define SS_IND(a,b) (a = b)
 148
 149 #define IND (0)
 150 #define TAG(x) x
 151 #include "ss_tritmp.h"
 152
 153 #define IND (SS_OFFSET_BIT)
 154 #define TAG(x) x##_offset
 155 #include "ss_tritmp.h"
 156
 157 #define IND (SS_TWOSIDE_BIT)
 158 #define TAG(x) x##_twoside
 159 #include "ss_tritmp.h"
 160
 161 #define IND (SS_OFFSET_BIT|SS_TWOSIDE_BIT)
 162 #define TAG(x) x##_offset_twoside
 163 #include "ss_tritmp.h"
 164
 165 #define IND (SS_UNFILLED_BIT)
 166 #define TAG(x) x##_unfilled
 167 #include "ss_tritmp.h"
 168
 169 #define IND (SS_OFFSET_BIT|SS_UNFILLED_BIT)
 170 #define TAG(x) x##_offset_unfilled
 171 #include "ss_tritmp.h"
 172
 173 #define IND (SS_TWOSIDE_BIT|SS_UNFILLED_BIT)
 174 #define TAG(x) x##_twoside_unfilled
 175 #include "ss_tritmp.h"
 176
 177 #define IND (SS_OFFSET_BIT|SS_TWOSIDE_BIT|SS_UNFILLED_BIT)
 178 #define TAG(x) x##_offset_twoside_unfilled
 179 #include "ss_tritmp.h"
 180
 181 #define IND (0|SS_RGBA_BIT)
 182 #define TAG(x) x##_rgba
 183 #include "ss_tritmp.h"
 184
 185 #define IND (SS_OFFSET_BIT|SS_RGBA_BIT)
 186 #define TAG(x) x##_offset_rgba
 187 #include "ss_tritmp.h"
 188
 189 #define IND (SS_TWOSIDE_BIT|SS_RGBA_BIT)
 190 #define TAG(x) x##_twoside_rgba
 191 #include "ss_tritmp.h"
 192
 193 #define IND (SS_OFFSET_BIT|SS_TWOSIDE_BIT|SS_RGBA_BIT)
 194 #define TAG(x) x##_offset_twoside_rgba
 195 #include "ss_tritmp.h"
 196
 197 #define IND (SS_UNFILLED_BIT|SS_RGBA_BIT)
 198 #define TAG(x) x##_unfilled_rgba
 199 #include "ss_tritmp.h"
 200
 201 #define IND (SS_OFFSET_BIT|SS_UNFILLED_BIT|SS_RGBA_BIT)
 202 #define TAG(x) x##_offset_unfilled_rgba
 203 #include "ss_tritmp.h"
 204
 205 #define IND (SS_TWOSIDE_BIT|SS_UNFILLED_BIT|SS_RGBA_BIT)
 206 #define TAG(x) x##_twoside_unfilled_rgba
 207 #include "ss_tritmp.h"
 208
 209 #define IND (SS_OFFSET_BIT|SS_TWOSIDE_BIT|SS_UNFILLED_BIT|SS_RGBA_BIT)
 210 #define TAG(x) x##_offset_twoside_unfilled_rgba
 211 #include "ss_tritmp.h"
 212
 213
 214 void _swsetup_trifuncs_init( GLcontext *ctx )
 215 {
 216    (void) ctx;
 217
 218    init();
 219    init_offset();
 220    init_twoside();
 221    init_offset_twoside();
 222    init_unfilled();
 223    init_offset_unfilled();
 224    init_twoside_unfilled();
 225    init_offset_twoside_unfilled();
 226
 227    init_rgba();
 228    init_offset_rgba();
 229    init_twoside_rgba();
 230    init_offset_twoside_rgba();
 231    init_unfilled_rgba();
 232    init_offset_unfilled_rgba();
 233    init_twoside_unfilled_rgba();
 234    init_offset_twoside_unfilled_rgba();
 235 }
 236
 237
 238 static void swsetup_points( GLcontext *ctx, GLuint first, GLuint last )
 239 {
 240    struct vertex_buffer *VB = &TNL_CONTEXT(ctx)->vb;
 241    SWvertex *verts = SWSETUP_CONTEXT(ctx)->verts;
 242    GLuint i;
 243
 244    if (VB->Elts) {
 245       for (i = first; i < last; i++)
 246          if (VB->ClipMask[VB->Elts[i]] == 0)
 247             _swrast_Point( ctx, &verts[VB->Elts[i]] );
 248    }
 249    else {
 250       for (i = first; i < last; i++)
 251          if (VB->ClipMask[i] == 0)
 252             _swrast_Point( ctx, &verts[i] );
 253    }
 254 }
 255
 256 static void swsetup_line( GLcontext *ctx, GLuint v0, GLuint v1 )
 257 {
 258    SWvertex *verts = SWSETUP_CONTEXT(ctx)->verts;
 259    _swrast_Line( ctx, &verts[v0], &verts[v1] );
 260 }
 261
 262
 263
 264 void _swsetup_choose_trifuncs( GLcontext *ctx )
 265 {
 266    TNLcontext *tnl = TNL_CONTEXT(ctx);
 267    GLuint ind = 0;
 268
 269    if (ctx->Polygon.OffsetPoint ||
 270        ctx->Polygon.OffsetLine ||
 271        ctx->Polygon.OffsetFill)
 272       ind |= SS_OFFSET_BIT;
 273
 274    if (ctx->Light.Enabled && ctx->Light.Model.TwoSide)
 275       ind |= SS_TWOSIDE_BIT;
 276
 277    /* We piggyback the two-sided stencil front/back determination on the
 278     * unfilled triangle path.
 279     */
 280    if ((ctx->_TriangleCaps & DD_TRI_UNFILLED) ||
 281        (ctx->Stencil.Enabled && ctx->Stencil.TestTwoSide))
 282       ind |= SS_UNFILLED_BIT;
 283
 284    if (ctx->Visual.rgbMode)
 285       ind |= SS_RGBA_BIT;
 286
 287    tnl->Driver.Render.Triangle = tri_tab[ind];
 288    tnl->Driver.Render.Quad = quad_tab[ind];
 289    tnl->Driver.Render.Line = swsetup_line;
 290    tnl->Driver.Render.Points = swsetup_points;
 291
 292    ctx->_Facing = 0;
 293 }