src/mesa/swrast_setup/ss_triangle.c

   1
   2 /*
   3  * Mesa 3-D graphics library
   4  * Version:  3.5
   5  *
   6  * Copyright (C) 1999-2001  Brian Paul   All Rights Reserved.
   7  *
   8  * Permission is hereby granted, free of charge, to any person obtaining a
   9  * copy of this software and associated documentation files (the "Software"),
  10  * to deal in the Software without restriction, including without limitation
  11  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  12  * and/or sell copies of the Software, and to permit persons to whom the
  13  * Software is furnished to do so, subject to the following conditions:
  14  *
  15  * The above copyright notice and this permission notice shall be included
  16  * in all copies or substantial portions of the Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  19  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  20  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  21  * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  22  * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  23  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  24  *
  25  * Authors:
  26  *    Keith Whitwell <keith@tungstengraphics.com>
  27  */
  28
  29 #include "glheader.h"
  30 #include "colormac.h"
  31 #include "macros.h"
  32 #include "mtypes.h"
  33
  34 #include "tnl/t_context.h"
  35
  36 #include "ss_triangle.h"
  37 #include "ss_context.h"
  38
  39 #define SS_RGBA_BIT         0x1
  40 #define SS_OFFSET_BIT       0x2
  41 #define SS_TWOSIDE_BIT      0x4
  42 #define SS_UNFILLED_BIT     0x8
  43 #define SS_MAX_TRIFUNC      0x10
  44
  45 static triangle_func tri_tab[SS_MAX_TRIFUNC];
  46 static quad_func     quad_tab[SS_MAX_TRIFUNC];
  47
  48
  49 static void _swsetup_render_line_tri( GLcontext *ctx,
  50                                       GLuint e0, GLuint e1, GLuint e2,
  51                                       GLuint facing )
  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    /* cull testing */
  65    if (ctx->Polygon.CullFlag) {
  66       if (facing == 1 && ctx->Polygon.CullFaceMode != GL_FRONT)
  67          return;
  68       if (facing == 0 && ctx->Polygon.CullFaceMode != GL_BACK)
  69          return;
  70    }
  71
  72    if (ctx->Light.ShadeModel == GL_FLAT) {
  73       COPY_CHAN4(c[0], v0->color);
  74       COPY_CHAN4(c[1], v1->color);
  75       COPY_CHAN4(s[0], v0->specular);
  76       COPY_CHAN4(s[1], v1->specular);
  77       i[0] = v0->index;
  78       i[1] = v1->index;
  79
  80       COPY_CHAN4(v0->color, v2->color);
  81       COPY_CHAN4(v1->color, v2->color);
  82       COPY_CHAN4(v0->specular, v2->specular);
  83       COPY_CHAN4(v1->specular, v2->specular);
  84       v0->index = v2->index;
  85       v1->index = v2->index;
  86    }
  87
  88    if (swsetup->render_prim == GL_POLYGON) {
  89       if (ef[e2]) _swrast_Line( ctx, v2, v0 );
  90       if (ef[e0]) _swrast_Line( ctx, v0, v1 );
  91       if (ef[e1]) _swrast_Line( ctx, v1, v2 );
  92    } else {
  93       if (ef[e0]) _swrast_Line( ctx, v0, v1 );
  94       if (ef[e1]) _swrast_Line( ctx, v1, v2 );
  95       if (ef[e2]) _swrast_Line( ctx, v2, v0 );
  96    }
  97
  98    if (ctx->Light.ShadeModel == GL_FLAT) {
  99       COPY_CHAN4(v0->color, c[0]);
 100       COPY_CHAN4(v1->color, c[1]);
 101       COPY_CHAN4(v0->specular, s[0]);
 102       COPY_CHAN4(v1->specular, s[1]);
 103       v0->index = i[0];
 104       v1->index = i[1];
 105    }
 106 }
 107
 108 static void _swsetup_render_point_tri( GLcontext *ctx,
 109                                        GLuint e0, GLuint e1, GLuint e2,
 110                                        GLuint facing )
 111 {
 112    SScontext *swsetup = SWSETUP_CONTEXT(ctx);
 113    struct vertex_buffer *VB = &TNL_CONTEXT(ctx)->vb;
 114    GLubyte *ef = VB->EdgeFlag;
 115    SWvertex *verts = swsetup->verts;
 116    SWvertex *v0 = &verts[e0];
 117    SWvertex *v1 = &verts[e1];
 118    SWvertex *v2 = &verts[e2];
 119    GLchan c[2][4];
 120    GLchan s[2][4];
 121    GLuint i[2];
 122
 123    /* cull testing */
 124    if (ctx->Polygon.CullFlag) {
 125       if (facing == 1 && ctx->Polygon.CullFaceMode != GL_FRONT)
 126          return;
 127       if (facing == 0 && ctx->Polygon.CullFaceMode != GL_BACK)
 128          return;
 129    }
 130
 131    if (ctx->Light.ShadeModel == GL_FLAT) {
 132       /* save colors/indexes for v0, v1 vertices */
 133       COPY_CHAN4(c[0], v0->color);
 134       COPY_CHAN4(c[1], v1->color);
 135       COPY_CHAN4(s[0], v0->specular);
 136       COPY_CHAN4(s[1], v1->specular);
 137       i[0] = v0->index;
 138       i[1] = v1->index;
 139
 140       /* copy v2 color/indexes to v0, v1 indexes */
 141       COPY_CHAN4(v0->color, v2->color);
 142       COPY_CHAN4(v1->color, v2->color);
 143       COPY_CHAN4(v0->specular, v2->specular);
 144       COPY_CHAN4(v1->specular, v2->specular);
 145       v0->index = v2->index;
 146       v1->index = v2->index;
 147    }
 148
 149    if (ef[e0]) _swrast_Point( ctx, v0 );
 150    if (ef[e1]) _swrast_Point( ctx, v1 );
 151    if (ef[e2]) _swrast_Point( ctx, v2 );
 152
 153    if (ctx->Light.ShadeModel == GL_FLAT) {
 154       /* restore v0, v1 colores/indexes */
 155       COPY_CHAN4(v0->color, c[0]);
 156       COPY_CHAN4(v1->color, c[1]);
 157       COPY_CHAN4(v0->specular, s[0]);
 158       COPY_CHAN4(v1->specular, s[1]);
 159       v0->index = i[0];
 160       v1->index = i[1];
 161    }
 162    _swrast_flush(ctx);
 163 }
 164
 165 #define SS_COLOR(a,b) UNCLAMPED_FLOAT_TO_RGBA_CHAN(a,b)
 166 #define SS_SPEC(a,b) UNCLAMPED_FLOAT_TO_RGB_CHAN(a,b)
 167 #define SS_IND(a,b) (a = b)
 168
 169 #define IND (0)
 170 #define TAG(x) x
 171 #include "ss_tritmp.h"
 172
 173 #define IND (SS_OFFSET_BIT)
 174 #define TAG(x) x##_offset
 175 #include "ss_tritmp.h"
 176
 177 #define IND (SS_TWOSIDE_BIT)
 178 #define TAG(x) x##_twoside
 179 #include "ss_tritmp.h"
 180
 181 #define IND (SS_OFFSET_BIT|SS_TWOSIDE_BIT)
 182 #define TAG(x) x##_offset_twoside
 183 #include "ss_tritmp.h"
 184
 185 #define IND (SS_UNFILLED_BIT)
 186 #define TAG(x) x##_unfilled
 187 #include "ss_tritmp.h"
 188
 189 #define IND (SS_OFFSET_BIT|SS_UNFILLED_BIT)
 190 #define TAG(x) x##_offset_unfilled
 191 #include "ss_tritmp.h"
 192
 193 #define IND (SS_TWOSIDE_BIT|SS_UNFILLED_BIT)
 194 #define TAG(x) x##_twoside_unfilled
 195 #include "ss_tritmp.h"
 196
 197 #define IND (SS_OFFSET_BIT|SS_TWOSIDE_BIT|SS_UNFILLED_BIT)
 198 #define TAG(x) x##_offset_twoside_unfilled
 199 #include "ss_tritmp.h"
 200
 201 #define IND (0|SS_RGBA_BIT)
 202 #define TAG(x) x##_rgba
 203 #include "ss_tritmp.h"
 204
 205 #define IND (SS_OFFSET_BIT|SS_RGBA_BIT)
 206 #define TAG(x) x##_offset_rgba
 207 #include "ss_tritmp.h"
 208
 209 #define IND (SS_TWOSIDE_BIT|SS_RGBA_BIT)
 210 #define TAG(x) x##_twoside_rgba
 211 #include "ss_tritmp.h"
 212
 213 #define IND (SS_OFFSET_BIT|SS_TWOSIDE_BIT|SS_RGBA_BIT)
 214 #define TAG(x) x##_offset_twoside_rgba
 215 #include "ss_tritmp.h"
 216
 217 #define IND (SS_UNFILLED_BIT|SS_RGBA_BIT)
 218 #define TAG(x) x##_unfilled_rgba
 219 #include "ss_tritmp.h"
 220
 221 #define IND (SS_OFFSET_BIT|SS_UNFILLED_BIT|SS_RGBA_BIT)
 222 #define TAG(x) x##_offset_unfilled_rgba
 223 #include "ss_tritmp.h"
 224
 225 #define IND (SS_TWOSIDE_BIT|SS_UNFILLED_BIT|SS_RGBA_BIT)
 226 #define TAG(x) x##_twoside_unfilled_rgba
 227 #include "ss_tritmp.h"
 228
 229 #define IND (SS_OFFSET_BIT|SS_TWOSIDE_BIT|SS_UNFILLED_BIT|SS_RGBA_BIT)
 230 #define TAG(x) x##_offset_twoside_unfilled_rgba
 231 #include "ss_tritmp.h"
 232
 233
 234 void _swsetup_trifuncs_init( GLcontext *ctx )
 235 {
 236    (void) ctx;
 237
 238    init();
 239    init_offset();
 240    init_twoside();
 241    init_offset_twoside();
 242    init_unfilled();
 243    init_offset_unfilled();
 244    init_twoside_unfilled();
 245    init_offset_twoside_unfilled();
 246
 247    init_rgba();
 248    init_offset_rgba();
 249    init_twoside_rgba();
 250    init_offset_twoside_rgba();
 251    init_unfilled_rgba();
 252    init_offset_unfilled_rgba();
 253    init_twoside_unfilled_rgba();
 254    init_offset_twoside_unfilled_rgba();
 255 }
 256
 257
 258 static void swsetup_points( GLcontext *ctx, GLuint first, GLuint last )
 259 {
 260    struct vertex_buffer *VB = &TNL_CONTEXT(ctx)->vb;
 261    SWvertex *verts = SWSETUP_CONTEXT(ctx)->verts;
 262    GLuint i;
 263
 264    if (VB->Elts) {
 265       for (i = first; i < last; i++)
 266          if (VB->ClipMask[VB->Elts[i]] == 0)
 267             _swrast_Point( ctx, &verts[VB->Elts[i]] );
 268    }
 269    else {
 270       for (i = first; i < last; i++)
 271          if (VB->ClipMask[i] == 0)
 272             _swrast_Point( ctx, &verts[i] );
 273    }
 274 }
 275
 276 static void swsetup_line( GLcontext *ctx, GLuint v0, GLuint v1 )
 277 {
 278    SWvertex *verts = SWSETUP_CONTEXT(ctx)->verts;
 279    _swrast_Line( ctx, &verts[v0], &verts[v1] );
 280 }
 281
 282
 283
 284 void _swsetup_choose_trifuncs( GLcontext *ctx )
 285 {
 286    TNLcontext *tnl = TNL_CONTEXT(ctx);
 287    GLuint ind = 0;
 288
 289    if (ctx->Polygon.OffsetPoint ||
 290        ctx->Polygon.OffsetLine ||
 291        ctx->Polygon.OffsetFill)
 292       ind |= SS_OFFSET_BIT;
 293
 294    if (ctx->Light.Enabled && ctx->Light.Model.TwoSide)
 295       ind |= SS_TWOSIDE_BIT;
 296
 297    /* We piggyback the two-sided stencil front/back determination on the
 298     * unfilled triangle path.
 299     */
 300    if (ctx->Polygon.FrontMode != GL_FILL ||
 301        ctx->Polygon.BackMode != GL_FILL ||
 302        (ctx->Stencil.Enabled && ctx->Stencil.TestTwoSide))
 303       ind |= SS_UNFILLED_BIT;
 304
 305    if (ctx->Visual.rgbMode)
 306       ind |= SS_RGBA_BIT;
 307
 308    tnl->Driver.Render.Triangle = tri_tab[ind];
 309    tnl->Driver.Render.Quad = quad_tab[ind];
 310    tnl->Driver.Render.Line = swsetup_line;
 311    tnl->Driver.Render.Points = swsetup_points;
 312
 313    ctx->_Facing = 0;
 314 }