src/mesa/swrast_setup/ss_tritmp.h

   1 /*
   2  * Mesa 3-D graphics library
   3  * Version:  3.5
   4  *
   5  * Copyright (C) 1999  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 <keithw@valinux.com>
  26  */
  27
  28
  29 static void TAG(triangle)(GLcontext *ctx,
  30                           GLuint e0, GLuint e1, GLuint e2,
  31                           GLuint pv)
  32 {
  33    struct vertex_buffer *VB = TNL_VB(ctx);
  34    SWvertex *verts = SWSETUP_VB(VB)->verts;
  35    SWvertex *v[3];
  36    GLfloat offset;
  37    GLfloat z[3];
  38    GLubyte c[3][4], s[3][4];
  39    GLuint i[3];
  40    GLenum mode = GL_FILL;
  41
  42    v[0] = &verts[e0];
  43    v[1] = &verts[e1];
  44    v[2] = &verts[e2];
  45
  46    if (IND & (SS_TWOSIDE_BIT | SS_FLAT_BIT)) {
  47       SS_COLOR(c[0], v[0]->color);
  48
  49       if (IND & SS_TWOSIDE_BIT) {
  50          SS_COLOR(c[1], v[1]->color);
  51          SS_COLOR(c[2], v[2]->color);
  52       }
  53
  54       if (IND & SS_COPY_EXTRAS) {
  55          SS_SPEC(s[0], v[0]->specular);
  56          SS_IND(i[0], v[0]->index);
  57
  58          if (IND & SS_TWOSIDE_BIT) {
  59             SS_SPEC(s[1], v[1]->specular);
  60             SS_IND(i[1], v[1]->index);
  61
  62             SS_SPEC(s[2], v[2]->specular);
  63             SS_IND(i[2], v[2]->index);
  64          }
  65       }
  66    }
  67
  68    if (IND & (SS_TWOSIDE_BIT | SS_OFFSET_BIT | SS_UNFILLED_BIT))
  69    {
  70       GLfloat ex = v[0]->win[0] - v[2]->win[0];
  71       GLfloat ey = v[0]->win[1] - v[2]->win[1];
  72       GLfloat fx = v[1]->win[0] - v[2]->win[0];
  73       GLfloat fy = v[1]->win[1] - v[2]->win[1];
  74       GLfloat cc  = ex*fy - ey*fx;
  75
  76       if (IND & (SS_TWOSIDE_BIT | SS_UNFILLED_BIT))
  77       {
  78          GLuint  facing = (cc < 0.0) ^ ctx->Polygon.FrontBit;
  79
  80          if (IND & SS_UNFILLED_BIT)
  81             mode = facing ? ctx->Polygon.BackMode : ctx->Polygon.FrontMode;
  82
  83          if (IND & SS_TWOSIDE_BIT) {
  84             GLubyte (*vbcolor)[4] = VB->Color[facing]->data;
  85             GLubyte (*vbspec)[4] = VB->SecondaryColor[facing]->data;
  86             GLuint *vbindex = VB->Index[facing]->data;
  87
  88             if (IND & SS_FLAT_BIT) {
  89                SS_COLOR(v[0]->color, vbcolor[pv]);
  90                SS_COLOR(v[1]->color, vbcolor[pv]);
  91                SS_COLOR(v[2]->color, vbcolor[pv]);
  92
  93                if (IND & SS_COPY_EXTRAS) {
  94                   SS_SPEC(v[0]->specular, vbspec[pv]);
  95                   SS_SPEC(v[1]->specular, vbspec[pv]);
  96                   SS_SPEC(v[2]->specular, vbspec[pv]);
  97
  98                   SS_IND(v[0]->index, vbindex[pv]);
  99                   SS_IND(v[1]->index, vbindex[pv]);
 100                   SS_IND(v[2]->index, vbindex[pv]);
 101                }
 102             } else {
 103                SS_COLOR(v[0]->color, vbcolor[e0]);
 104                SS_COLOR(v[1]->color, vbcolor[e1]);
 105                SS_COLOR(v[2]->color, vbcolor[e2]);
 106
 107                if (IND & SS_COPY_EXTRAS) {
 108                   SS_SPEC(v[0]->specular, vbspec[e0]);
 109                   SS_SPEC(v[1]->specular, vbspec[e1]);
 110                   SS_SPEC(v[2]->specular, vbspec[e2]);
 111
 112                   SS_IND(v[0]->index, vbindex[e0]);
 113                   SS_IND(v[1]->index, vbindex[e1]);
 114                   SS_IND(v[2]->index, vbindex[e2]);
 115                }
 116             }
 117          }
 118       }
 119
 120       if (IND & SS_OFFSET_BIT)
 121       {
 122          offset = ctx->Polygon.OffsetUnits;
 123          z[0] = v[0]->win[2];
 124          z[1] = v[1]->win[2];
 125          z[2] = v[2]->win[2];
 126          if (cc * cc > 1e-16) {
 127             GLfloat ez = z[0] - z[2];
 128             GLfloat fz = z[1] - z[2];
 129             GLfloat a = ey*fz - ez*fy;
 130             GLfloat b = ez*fx - ex*fz;
 131             GLfloat ic = 1.0 / cc;
 132             GLfloat ac = a * ic;
 133             GLfloat bc = b * ic;
 134             if (ac < 0.0f) ac = -ac;
 135             if (bc < 0.0f) bc = -bc;
 136             offset += MAX2(ac, bc) * ctx->Polygon.OffsetFactor;
 137          }
 138       }
 139    }
 140    else if (IND & SS_FLAT_BIT)
 141    {
 142       GLubyte *color = VB->Color[0]->data[pv];
 143       GLubyte *spec = VB->SecondaryColor[0]->data[pv];
 144       GLuint index = VB->Index[0]->data[pv];
 145
 146       SS_COLOR(v[0]->color, color);
 147
 148       if (IND & SS_COPY_EXTRAS) {
 149          SS_SPEC(v[0]->specular, spec);
 150          SS_IND(v[0]->index, index);
 151       }
 152    }
 153
 154    if (mode == GL_POINT) {
 155       GLubyte *ef = VB->EdgeFlagPtr->data;
 156       if ((IND & SS_OFFSET_BIT) && ctx->Polygon.OffsetPoint) {
 157          v[0]->win[2] += offset;
 158          v[1]->win[2] += offset;
 159          v[2]->win[2] += offset;
 160       }
 161       if (ef[e0]&0x1) { ef[e0] &= ~0x1; _swrast_Point( ctx, v[0] ); }
 162       if (ef[e1]&0x1) { ef[e1] &= ~0x1; _swrast_Point( ctx, v[1] ); }
 163       if (ef[e2]&0x2) { ef[e2] &= ~0x2; _swrast_Point( ctx, v[2] ); }
 164    } else if (mode == GL_LINE) {
 165       GLubyte *ef = VB->EdgeFlagPtr->data;
 166       if ((IND & SS_OFFSET_BIT) && ctx->Polygon.OffsetLine) {
 167          v[0]->win[2] += offset;
 168          v[1]->win[2] += offset;
 169          v[2]->win[2] += offset;
 170       }
 171       if (ef[e0]&0x1) { ef[e0] &= ~0x1; _swrast_Line( ctx, v[0], v[1] ); }
 172       if (ef[e1]&0x1) { ef[e1] &= ~0x1; _swrast_Line( ctx, v[1], v[2] ); }
 173       if (ef[e2]&0x2) { ef[e2] &= ~0x2; _swrast_Line( ctx, v[2], v[0] ); }
 174    } else {
 175       if ((IND & SS_OFFSET_BIT) && ctx->Polygon.OffsetFill) {
 176          v[0]->win[2] += offset;
 177          v[1]->win[2] += offset;
 178          v[2]->win[2] += offset;
 179       }
 180       _swrast_Triangle( ctx, v[0], v[1], v[2] );
 181    }
 182
 183    if (IND & SS_OFFSET_BIT) {
 184       v[0]->win[2] = z[0];
 185       v[1]->win[2] = z[1];
 186       v[2]->win[2] = z[2];
 187    }
 188
 189    if (IND & (SS_FLAT_BIT | SS_TWOSIDE_BIT)) {
 190       SS_COLOR(v[0]->color, c[0]);
 191
 192       if (IND & SS_TWOSIDE_BIT) {
 193          SS_COLOR(v[1]->color, c[1]);
 194          SS_COLOR(v[2]->color, c[2]);
 195       }
 196
 197       if (IND & SS_COPY_EXTRAS) {
 198          SS_SPEC(v[0]->specular, s[0]);
 199          SS_IND(v[0]->index, i[0]);
 200
 201          if (IND & SS_TWOSIDE_BIT) {
 202             SS_SPEC(v[1]->specular, s[1]);
 203             SS_IND(v[1]->index, i[1]);
 204
 205             SS_SPEC(v[2]->specular, s[2]);
 206             SS_IND(v[2]->index, i[2]);
 207          }
 208       }
 209    }
 210 }
 211
 212
 213
 214 /* Need to do something with edgeflags:
 215  */
 216 static void TAG(quad)( GLcontext *ctx, GLuint v0,
 217                        GLuint v1, GLuint v2, GLuint v3,
 218                        GLuint pv )
 219 {
 220    TAG(triangle)( ctx, v0, v1, v3, pv );
 221    TAG(triangle)( ctx, v1, v2, v3, pv );
 222 }
 223
 224
 225 static void TAG(line)( GLcontext *ctx, GLuint v0, GLuint v1, GLuint pv )
 226 {
 227    struct vertex_buffer *VB = TNL_VB(ctx);
 228    SWvertex *verts = SWSETUP_VB(VB)->verts;
 229    GLubyte c[2][4], s[2][4];
 230    GLuint i[2];
 231    SWvertex *vert0 = &verts[v0];
 232    SWvertex *vert1 = &verts[v1];
 233
 234
 235    if (IND & SS_FLAT_BIT) {
 236       GLubyte *color = VB->Color[0]->data[pv];
 237       GLubyte *spec = VB->SecondaryColor[0]->data[pv];
 238       GLuint index = VB->Index[0]->data[pv];
 239
 240       SS_COLOR(c[0], vert0->color);
 241       SS_COLOR(vert0->color, color);
 242
 243       if (IND & SS_COPY_EXTRAS) {
 244          SS_SPEC(s[0], vert0->specular);
 245          SS_SPEC(vert0->specular, spec);
 246
 247          SS_IND(i[0], vert0->index);
 248          SS_IND(vert0->index, index);
 249       }
 250    }
 251
 252    _swrast_Line( ctx, vert0, vert1 );
 253
 254    if (IND & SS_FLAT_BIT) {
 255       SS_COLOR(vert0->color, c[0]);
 256
 257       if (IND & SS_COPY_EXTRAS) {
 258          SS_SPEC(vert0->specular, s[0]);
 259          SS_IND(vert0->index, i[0]);
 260       }
 261    }
 262 }
 263
 264
 265 static void TAG(points)( GLcontext *ctx, GLuint first, GLuint last )
 266 {
 267    struct vertex_buffer *VB = TNL_VB(ctx);
 268    SWvertex *verts = SWSETUP_VB(VB)->verts;
 269    int i;
 270
 271    for(i=first;i<=last;i++)
 272       if(VB->ClipMask[i]==0)
 273          _swrast_Point( ctx, &verts[i] );
 274 }
 275
 276
 277
 278
 279 static void TAG(init)( void )
 280 {
 281    tri_tab[IND] = TAG(triangle);
 282    quad_tab[IND] = TAG(quad);
 283    line_tab[IND] = TAG(line);
 284    points_tab[IND] = TAG(points);
 285 }
 286
 287
 288 #undef IND
 289 #undef TAG
 290
 291
 292