src/mesa/swrast_setup/ss_triangle.c

   1 /*
   2  * Mesa 3-D graphics library
   3  * Version:  6.1
   4  *
   5  * Copyright (C) 1999-2004  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@tungstengraphics.com>
  26  */
  27
  28 #include "glheader.h"
  29 #include "colormac.h"
  30 #include "macros.h"
  31 #include "mtypes.h"
  32
  33 #include "tnl/t_context.h"
  34
  35 #include "ss_triangle.h"
  36 #include "ss_context.h"
  37
  38 #define SS_RGBA_BIT         0x1
  39 #define SS_OFFSET_BIT       0x2
  40 #define SS_TWOSIDE_BIT      0x4
  41 #define SS_UNFILLED_BIT     0x8
  42 #define SS_MAX_TRIFUNC      0x10
  43
  44 static tnl_triangle_func tri_tab[SS_MAX_TRIFUNC];
  45 static tnl_quad_func     quad_tab[SS_MAX_TRIFUNC];
  46
  47
  48 static void _swsetup_render_line_tri( GLcontext *ctx,
  49                                       GLuint e0, GLuint e1, GLuint e2,
  50                                       GLuint facing )
  51 {
  52    SScontext *swsetup = SWSETUP_CONTEXT(ctx);
  53    struct vertex_buffer *VB = &TNL_CONTEXT(ctx)->vb;
  54    GLubyte *ef = VB->EdgeFlag;
  55    SWvertex *verts = swsetup->verts;
  56    SWvertex *v0 = &verts[e0];
  57    SWvertex *v1 = &verts[e1];
  58    SWvertex *v2 = &verts[e2];
  59    GLchan c[2][4];
  60    GLfloat s[2][4];
  61    GLfloat i[2];
  62
  63    /* cull testing */
  64    if (ctx->Polygon.CullFlag) {
  65       if (facing == 1 && ctx->Polygon.CullFaceMode != GL_FRONT)
  66          return;
  67       if (facing == 0 && ctx->Polygon.CullFaceMode != GL_BACK)
  68          return;
  69    }
  70
  71    if (ctx->Light.ShadeModel == GL_FLAT) {
  72       COPY_CHAN4(c[0], v0->color);
  73       COPY_CHAN4(c[1], v1->color);
  74       COPY_4V(s[0], v0->attrib[FRAG_ATTRIB_COL1]);
  75       COPY_4V(s[1], v1->attrib[FRAG_ATTRIB_COL1]);
  76       i[0] = v0->attrib[FRAG_ATTRIB_CI][0];
  77       i[1] = v1->attrib[FRAG_ATTRIB_CI][0];
  78
  79       COPY_CHAN4(v0->color, v2->color);
  80       COPY_CHAN4(v1->color, v2->color);
  81       COPY_4V(v0->attrib[FRAG_ATTRIB_COL1], v2->attrib[FRAG_ATTRIB_COL1]);
  82       COPY_4V(v1->attrib[FRAG_ATTRIB_COL1], v2->attrib[FRAG_ATTRIB_COL1]);
  83       v0->attrib[FRAG_ATTRIB_CI][0] = v2->attrib[FRAG_ATTRIB_CI][0];
  84       v1->attrib[FRAG_ATTRIB_CI][0] = v2->attrib[FRAG_ATTRIB_CI][0];
  85    }
  86
  87    if (swsetup->render_prim == GL_POLYGON) {
  88       if (ef[e2]) _swrast_Line( ctx, v2, v0 );
  89       if (ef[e0]) _swrast_Line( ctx, v0, v1 );
  90       if (ef[e1]) _swrast_Line( ctx, v1, v2 );
  91    } else {
  92       if (ef[e0]) _swrast_Line( ctx, v0, v1 );
  93       if (ef[e1]) _swrast_Line( ctx, v1, v2 );
  94       if (ef[e2]) _swrast_Line( ctx, v2, v0 );
  95    }
  96
  97    if (ctx->Light.ShadeModel == GL_FLAT) {
  98       COPY_CHAN4(v0->color, c[0]);
  99       COPY_CHAN4(v1->color, c[1]);
 100       COPY_4V(v0->attrib[FRAG_ATTRIB_COL1], s[0]);
 101       COPY_4V(v1->attrib[FRAG_ATTRIB_COL1], s[1]);
 102       v0->attrib[FRAG_ATTRIB_CI][0] = i[0];
 103       v1->attrib[FRAG_ATTRIB_CI][0] = i[1];
 104    }
 105 }
 106
 107 static void _swsetup_render_point_tri( GLcontext *ctx,
 108                                        GLuint e0, GLuint e1, GLuint e2,
 109                                        GLuint facing )
 110 {
 111    SScontext *swsetup = SWSETUP_CONTEXT(ctx);
 112    struct vertex_buffer *VB = &TNL_CONTEXT(ctx)->vb;
 113    GLubyte *ef = VB->EdgeFlag;
 114    SWvertex *verts = swsetup->verts;
 115    SWvertex *v0 = &verts[e0];
 116    SWvertex *v1 = &verts[e1];
 117    SWvertex *v2 = &verts[e2];
 118    GLchan c[2][4];
 119    GLfloat s[2][4];
 120    GLfloat i[2];
 121
 122    /* cull testing */
 123    if (ctx->Polygon.CullFlag) {
 124       if (facing == 1 && ctx->Polygon.CullFaceMode != GL_FRONT)
 125          return;
 126       if (facing == 0 && ctx->Polygon.CullFaceMode != GL_BACK)
 127          return;
 128    }
 129
 130    if (ctx->Light.ShadeModel == GL_FLAT) {
 131       /* save colors/indexes for v0, v1 vertices */
 132       COPY_CHAN4(c[0], v0->color);
 133       COPY_CHAN4(c[1], v1->color);
 134       COPY_4V(s[0], v0->attrib[FRAG_ATTRIB_COL1]);
 135       COPY_4V(s[1], v1->attrib[FRAG_ATTRIB_COL1]);
 136       i[0] = v0->attrib[FRAG_ATTRIB_CI][0];
 137       i[1] = v1->attrib[FRAG_ATTRIB_CI][0];
 138
 139       /* copy v2 color/indexes to v0, v1 indexes */
 140       COPY_CHAN4(v0->color, v2->color);
 141       COPY_CHAN4(v1->color, v2->color);
 142       COPY_4V(v0->attrib[FRAG_ATTRIB_COL1], v2->attrib[FRAG_ATTRIB_COL1]);
 143       COPY_4V(v1->attrib[FRAG_ATTRIB_COL1], v2->attrib[FRAG_ATTRIB_COL1]);
 144       v0->attrib[FRAG_ATTRIB_CI][0] = v2->attrib[FRAG_ATTRIB_CI][0];
 145       v1->attrib[FRAG_ATTRIB_CI][0] = v2->attrib[FRAG_ATTRIB_CI][0];
 146    }
 147
 148    if (ef[e0]) _swrast_Point( ctx, v0 );
 149    if (ef[e1]) _swrast_Point( ctx, v1 );
 150    if (ef[e2]) _swrast_Point( ctx, v2 );
 151
 152    if (ctx->Light.ShadeModel == GL_FLAT) {
 153       /* restore v0, v1 colores/indexes */
 154       COPY_CHAN4(v0->color, c[0]);
 155       COPY_CHAN4(v1->color, c[1]);
 156       COPY_4V(v0->attrib[FRAG_ATTRIB_COL1], s[0]);
 157       COPY_4V(v1->attrib[FRAG_ATTRIB_COL1], s[1]);
 158       v0->attrib[FRAG_ATTRIB_CI][0] = i[0];
 159       v1->attrib[FRAG_ATTRIB_CI][0] = i[1];
 160    }
 161    _swrast_flush(ctx);
 162 }
 163
 164 #define SS_COLOR(a,b) UNCLAMPED_FLOAT_TO_RGBA_CHAN(a,b)
 165 #define SS_SPEC(a,b) UNCLAMPED_FLOAT_TO_RGB_CHAN(a,b)
 166 #define SS_IND(a,b) (a = b)
 167
 168 #define IND (0)
 169 #define TAG(x) x
 170 #include "ss_tritmp.h"
 171
 172 #define IND (SS_OFFSET_BIT)
 173 #define TAG(x) x##_offset
 174 #include "ss_tritmp.h"
 175
 176 #define IND (SS_TWOSIDE_BIT)
 177 #define TAG(x) x##_twoside
 178 #include "ss_tritmp.h"
 179
 180 #define IND (SS_OFFSET_BIT|SS_TWOSIDE_BIT)
 181 #define TAG(x) x##_offset_twoside
 182 #include "ss_tritmp.h"
 183
 184 #define IND (SS_UNFILLED_BIT)
 185 #define TAG(x) x##_unfilled
 186 #include "ss_tritmp.h"
 187
 188 #define IND (SS_OFFSET_BIT|SS_UNFILLED_BIT)
 189 #define TAG(x) x##_offset_unfilled
 190 #include "ss_tritmp.h"
 191
 192 #define IND (SS_TWOSIDE_BIT|SS_UNFILLED_BIT)
 193 #define TAG(x) x##_twoside_unfilled
 194 #include "ss_tritmp.h"
 195
 196 #define IND (SS_OFFSET_BIT|SS_TWOSIDE_BIT|SS_UNFILLED_BIT)
 197 #define TAG(x) x##_offset_twoside_unfilled
 198 #include "ss_tritmp.h"
 199
 200 #define IND (0|SS_RGBA_BIT)
 201 #define TAG(x) x##_rgba
 202 #include "ss_tritmp.h"
 203
 204 #define IND (SS_OFFSET_BIT|SS_RGBA_BIT)
 205 #define TAG(x) x##_offset_rgba
 206 #include "ss_tritmp.h"
 207
 208 #define IND (SS_TWOSIDE_BIT|SS_RGBA_BIT)
 209 #define TAG(x) x##_twoside_rgba
 210 #include "ss_tritmp.h"
 211
 212 #define IND (SS_OFFSET_BIT|SS_TWOSIDE_BIT|SS_RGBA_BIT)
 213 #define TAG(x) x##_offset_twoside_rgba
 214 #include "ss_tritmp.h"
 215
 216 #define IND (SS_UNFILLED_BIT|SS_RGBA_BIT)
 217 #define TAG(x) x##_unfilled_rgba
 218 #include "ss_tritmp.h"
 219
 220 #define IND (SS_OFFSET_BIT|SS_UNFILLED_BIT|SS_RGBA_BIT)
 221 #define TAG(x) x##_offset_unfilled_rgba
 222 #include "ss_tritmp.h"
 223
 224 #define IND (SS_TWOSIDE_BIT|SS_UNFILLED_BIT|SS_RGBA_BIT)
 225 #define TAG(x) x##_twoside_unfilled_rgba
 226 #include "ss_tritmp.h"
 227
 228 #define IND (SS_OFFSET_BIT|SS_TWOSIDE_BIT|SS_UNFILLED_BIT|SS_RGBA_BIT)
 229 #define TAG(x) x##_offset_twoside_unfilled_rgba
 230 #include "ss_tritmp.h"
 231
 232
 233 void _swsetup_trifuncs_init( GLcontext *ctx )
 234 {
 235    (void) ctx;
 236
 237    init();
 238    init_offset();
 239    init_twoside();
 240    init_offset_twoside();
 241    init_unfilled();
 242    init_offset_unfilled();
 243    init_twoside_unfilled();
 244    init_offset_twoside_unfilled();
 245
 246    init_rgba();
 247    init_offset_rgba();
 248    init_twoside_rgba();
 249    init_offset_twoside_rgba();
 250    init_unfilled_rgba();
 251    init_offset_unfilled_rgba();
 252    init_twoside_unfilled_rgba();
 253    init_offset_twoside_unfilled_rgba();
 254 }
 255
 256
 257 static void swsetup_points( GLcontext *ctx, GLuint first, GLuint last )
 258 {
 259    struct vertex_buffer *VB = &TNL_CONTEXT(ctx)->vb;
 260    SWvertex *verts = SWSETUP_CONTEXT(ctx)->verts;
 261    GLuint i;
 262
 263    if (VB->Elts) {
 264       for (i = first; i < last; i++)
 265          if (VB->ClipMask[VB->Elts[i]] == 0)
 266             _swrast_Point( ctx, &verts[VB->Elts[i]] );
 267    }
 268    else {
 269       for (i = first; i < last; i++)
 270          if (VB->ClipMask[i] == 0)
 271             _swrast_Point( ctx, &verts[i] );
 272    }
 273 }
 274
 275 static void swsetup_line( GLcontext *ctx, GLuint v0, GLuint v1 )
 276 {
 277    SWvertex *verts = SWSETUP_CONTEXT(ctx)->verts;
 278    _swrast_Line( ctx, &verts[v0], &verts[v1] );
 279 }
 280
 281
 282
 283 void _swsetup_choose_trifuncs( GLcontext *ctx )
 284 {
 285    TNLcontext *tnl = TNL_CONTEXT(ctx);
 286    GLuint ind = 0;
 287
 288    if (ctx->Polygon.OffsetPoint ||
 289        ctx->Polygon.OffsetLine ||
 290        ctx->Polygon.OffsetFill)
 291       ind |= SS_OFFSET_BIT;
 292
 293    /* Note: gl_FrontFacing lives in fragment input FOGC.Y at this time */
 294    if ((ctx->Light.Enabled && ctx->Light.Model.TwoSide) ||
 295        (ctx->VertexProgram._Enabled && ctx->VertexProgram.TwoSideEnabled) ||
 296        (ctx->FragmentProgram._Current && ctx->FragmentProgram._Current->Base.InputsRead & (1 << FRAG_ATTRIB_FOGC)))
 297       ind |= SS_TWOSIDE_BIT;
 298
 299    /* We piggyback the two-sided stencil front/back determination on the
 300     * unfilled triangle path.
 301     */
 302    if (ctx->Polygon.FrontMode != GL_FILL ||
 303        ctx->Polygon.BackMode != GL_FILL ||
 304        (ctx->Stencil.Enabled && ctx->Stencil._TestTwoSide))
 305       ind |= SS_UNFILLED_BIT;
 306
 307    if (ctx->Visual.rgbMode)
 308       ind |= SS_RGBA_BIT;
 309
 310    tnl->Driver.Render.Triangle = tri_tab[ind];
 311    tnl->Driver.Render.Quad = quad_tab[ind];
 312    tnl->Driver.Render.Line = swsetup_line;
 313    tnl->Driver.Render.Points = swsetup_points;
 314
 315    ctx->_Facing = 0;
 316 }