src/mesa/swrast_setup/ss_triangle.c

   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@tungstengraphics.com>
  26  */
  27
  28 #include "main/glheader.h"
  29 #include "main/colormac.h"
  30 #include "main/macros.h"
  31 #include "main/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 /*
  49  * Render a triangle respecting edge flags.
  50  */
  51 typedef void (* swsetup_edge_render_prim_tri)(GLcontext *ctx,
  52                                               const GLubyte *ef,
  53                                               GLuint e0,
  54                                               GLuint e1,
  55                                               GLuint e2,
  56                                               const SWvertex *v0,
  57                                               const SWvertex *v1,
  58                                               const SWvertex *v2);
  59
  60 /*
  61  * Render a triangle using lines and respecting edge flags.
  62  */
  63 static void
  64 _swsetup_edge_render_line_tri(GLcontext *ctx,
  65                               const GLubyte *ef,
  66                               GLuint e0,
  67                               GLuint e1,
  68                               GLuint e2,
  69                               const SWvertex *v0,
  70                               const SWvertex *v1,
  71                               const SWvertex *v2)
  72 {
  73    SScontext *swsetup = SWSETUP_CONTEXT(ctx);
  74
  75    if (swsetup->render_prim == GL_POLYGON) {
  76       if (ef[e2]) _swrast_Line( ctx, v2, v0 );
  77       if (ef[e0]) _swrast_Line( ctx, v0, v1 );
  78       if (ef[e1]) _swrast_Line( ctx, v1, v2 );
  79    } else {
  80       if (ef[e0]) _swrast_Line( ctx, v0, v1 );
  81       if (ef[e1]) _swrast_Line( ctx, v1, v2 );
  82       if (ef[e2]) _swrast_Line( ctx, v2, v0 );
  83    }
  84 }
  85
  86 /*
  87  * Render a triangle using points and respecting edge flags.
  88  */
  89 static void
  90 _swsetup_edge_render_point_tri(GLcontext *ctx,
  91                                const GLubyte *ef,
  92                                GLuint e0,
  93                                GLuint e1,
  94                                GLuint e2,
  95                                const SWvertex *v0,
  96                                const SWvertex *v1,
  97                                const SWvertex *v2)
  98 {
  99    if (ef[e0]) _swrast_Point( ctx, v0 );
 100    if (ef[e1]) _swrast_Point( ctx, v1 );
 101    if (ef[e2]) _swrast_Point( ctx, v2 );
 102
 103    _swrast_flush(ctx);
 104 }
 105
 106 /*
 107  * Render a triangle respecting cull and shade model.
 108  */
 109 static void _swsetup_render_tri(GLcontext *ctx,
 110                                 GLuint e0,
 111                                 GLuint e1,
 112                                 GLuint e2,
 113                                 GLuint facing,
 114                                 swsetup_edge_render_prim_tri render)
 115 {
 116    SScontext *swsetup = SWSETUP_CONTEXT(ctx);
 117    struct vertex_buffer *VB = &TNL_CONTEXT(ctx)->vb;
 118    GLubyte *ef = VB->EdgeFlag;
 119    SWvertex *verts = swsetup->verts;
 120    SWvertex *v0 = &verts[e0];
 121    SWvertex *v1 = &verts[e1];
 122    SWvertex *v2 = &verts[e2];
 123
 124    /* cull testing */
 125    if (ctx->Polygon.CullFlag) {
 126       if (facing == 1 && ctx->Polygon.CullFaceMode != GL_FRONT)
 127          return;
 128       if (facing == 0 && ctx->Polygon.CullFaceMode != GL_BACK)
 129          return;
 130    }
 131
 132    _swrast_SetFacing(ctx, facing);
 133
 134    if (ctx->Light.ShadeModel == GL_FLAT) {
 135       GLchan c[2][4];
 136       GLfloat s[2][4];
 137       GLfloat i[2];
 138
 139       /* save colors/indexes for v0, v1 vertices */
 140       COPY_CHAN4(c[0], v0->color);
 141       COPY_CHAN4(c[1], v1->color);
 142       COPY_4V(s[0], v0->attrib[FRAG_ATTRIB_COL1]);
 143       COPY_4V(s[1], v1->attrib[FRAG_ATTRIB_COL1]);
 144       i[0] = v0->attrib[FRAG_ATTRIB_CI][0];
 145       i[1] = v1->attrib[FRAG_ATTRIB_CI][0];
 146
 147       /* copy v2 color/indexes to v0, v1 indexes */
 148       COPY_CHAN4(v0->color, v2->color);
 149       COPY_CHAN4(v1->color, v2->color);
 150       COPY_4V(v0->attrib[FRAG_ATTRIB_COL1], v2->attrib[FRAG_ATTRIB_COL1]);
 151       COPY_4V(v1->attrib[FRAG_ATTRIB_COL1], v2->attrib[FRAG_ATTRIB_COL1]);
 152       v0->attrib[FRAG_ATTRIB_CI][0] = v2->attrib[FRAG_ATTRIB_CI][0];
 153       v1->attrib[FRAG_ATTRIB_CI][0] = v2->attrib[FRAG_ATTRIB_CI][0];
 154
 155       render(ctx, ef, e0, e1, e2, v0, v1, v2);
 156
 157       COPY_CHAN4(v0->color, c[0]);
 158       COPY_CHAN4(v1->color, c[1]);
 159       COPY_4V(v0->attrib[FRAG_ATTRIB_COL1], s[0]);
 160       COPY_4V(v1->attrib[FRAG_ATTRIB_COL1], s[1]);
 161       v0->attrib[FRAG_ATTRIB_CI][0] = i[0];
 162       v1->attrib[FRAG_ATTRIB_CI][0] = i[1];
 163    }
 164    else {
 165       render(ctx, ef, e0, e1, e2, v0, v1, v2);
 166    }
 167 }
 168
 169 #define SS_COLOR(a,b) UNCLAMPED_FLOAT_TO_RGBA_CHAN(a,b)
 170 #define SS_SPEC(a,b) UNCLAMPED_FLOAT_TO_RGB_CHAN(a,b)
 171 #define SS_IND(a,b) (a = b)
 172
 173 #define IND (0)
 174 #define TAG(x) x
 175 #include "ss_tritmp.h"
 176
 177 #define IND (SS_OFFSET_BIT)
 178 #define TAG(x) x##_offset
 179 #include "ss_tritmp.h"
 180
 181 #define IND (SS_TWOSIDE_BIT)
 182 #define TAG(x) x##_twoside
 183 #include "ss_tritmp.h"
 184
 185 #define IND (SS_OFFSET_BIT|SS_TWOSIDE_BIT)
 186 #define TAG(x) x##_offset_twoside
 187 #include "ss_tritmp.h"
 188
 189 #define IND (SS_UNFILLED_BIT)
 190 #define TAG(x) x##_unfilled
 191 #include "ss_tritmp.h"
 192
 193 #define IND (SS_OFFSET_BIT|SS_UNFILLED_BIT)
 194 #define TAG(x) x##_offset_unfilled
 195 #include "ss_tritmp.h"
 196
 197 #define IND (SS_TWOSIDE_BIT|SS_UNFILLED_BIT)
 198 #define TAG(x) x##_twoside_unfilled
 199 #include "ss_tritmp.h"
 200
 201 #define IND (SS_OFFSET_BIT|SS_TWOSIDE_BIT|SS_UNFILLED_BIT)
 202 #define TAG(x) x##_offset_twoside_unfilled
 203 #include "ss_tritmp.h"
 204
 205 #define IND (0|SS_RGBA_BIT)
 206 #define TAG(x) x##_rgba
 207 #include "ss_tritmp.h"
 208
 209 #define IND (SS_OFFSET_BIT|SS_RGBA_BIT)
 210 #define TAG(x) x##_offset_rgba
 211 #include "ss_tritmp.h"
 212
 213 #define IND (SS_TWOSIDE_BIT|SS_RGBA_BIT)
 214 #define TAG(x) x##_twoside_rgba
 215 #include "ss_tritmp.h"
 216
 217 #define IND (SS_OFFSET_BIT|SS_TWOSIDE_BIT|SS_RGBA_BIT)
 218 #define TAG(x) x##_offset_twoside_rgba
 219 #include "ss_tritmp.h"
 220
 221 #define IND (SS_UNFILLED_BIT|SS_RGBA_BIT)
 222 #define TAG(x) x##_unfilled_rgba
 223 #include "ss_tritmp.h"
 224
 225 #define IND (SS_OFFSET_BIT|SS_UNFILLED_BIT|SS_RGBA_BIT)
 226 #define TAG(x) x##_offset_unfilled_rgba
 227 #include "ss_tritmp.h"
 228
 229 #define IND (SS_TWOSIDE_BIT|SS_UNFILLED_BIT|SS_RGBA_BIT)
 230 #define TAG(x) x##_twoside_unfilled_rgba
 231 #include "ss_tritmp.h"
 232
 233 #define IND (SS_OFFSET_BIT|SS_TWOSIDE_BIT|SS_UNFILLED_BIT|SS_RGBA_BIT)
 234 #define TAG(x) x##_offset_twoside_unfilled_rgba
 235 #include "ss_tritmp.h"
 236
 237
 238 void _swsetup_trifuncs_init( GLcontext *ctx )
 239 {
 240    (void) ctx;
 241
 242    init();
 243    init_offset();
 244    init_twoside();
 245    init_offset_twoside();
 246    init_unfilled();
 247    init_offset_unfilled();
 248    init_twoside_unfilled();
 249    init_offset_twoside_unfilled();
 250
 251    init_rgba();
 252    init_offset_rgba();
 253    init_twoside_rgba();
 254    init_offset_twoside_rgba();
 255    init_unfilled_rgba();
 256    init_offset_unfilled_rgba();
 257    init_twoside_unfilled_rgba();
 258    init_offset_twoside_unfilled_rgba();
 259 }
 260
 261
 262 static void swsetup_points( GLcontext *ctx, GLuint first, GLuint last )
 263 {
 264    struct vertex_buffer *VB = &TNL_CONTEXT(ctx)->vb;
 265    SWvertex *verts = SWSETUP_CONTEXT(ctx)->verts;
 266    GLuint i;
 267
 268    if (VB->Elts) {
 269       for (i = first; i < last; i++)
 270          if (VB->ClipMask[VB->Elts[i]] == 0)
 271             _swrast_Point( ctx, &verts[VB->Elts[i]] );
 272    }
 273    else {
 274       for (i = first; i < last; i++)
 275          if (VB->ClipMask[i] == 0)
 276             _swrast_Point( ctx, &verts[i] );
 277    }
 278 }
 279
 280 static void swsetup_line( GLcontext *ctx, GLuint v0, GLuint v1 )
 281 {
 282    SWvertex *verts = SWSETUP_CONTEXT(ctx)->verts;
 283    _swrast_Line( ctx, &verts[v0], &verts[v1] );
 284 }
 285
 286
 287
 288 void _swsetup_choose_trifuncs( GLcontext *ctx )
 289 {
 290    TNLcontext *tnl = TNL_CONTEXT(ctx);
 291    GLuint ind = 0;
 292
 293    if (ctx->Polygon.OffsetPoint ||
 294        ctx->Polygon.OffsetLine ||
 295        ctx->Polygon.OffsetFill)
 296       ind |= SS_OFFSET_BIT;
 297
 298    if ((ctx->Light.Enabled && ctx->Light.Model.TwoSide) ||
 299        (ctx->VertexProgram._Current && ctx->VertexProgram.TwoSideEnabled))
 300       ind |= SS_TWOSIDE_BIT;
 301
 302    /* We piggyback the two-sided stencil front/back determination on the
 303     * unfilled triangle path.
 304     */
 305    if (ctx->Polygon.FrontMode != GL_FILL ||
 306        ctx->Polygon.BackMode != GL_FILL ||
 307        (ctx->Stencil.Enabled && ctx->Stencil._TestTwoSide))
 308       ind |= SS_UNFILLED_BIT;
 309
 310    if (ctx->Visual.rgbMode)
 311       ind |= SS_RGBA_BIT;
 312
 313    tnl->Driver.Render.Triangle = tri_tab[ind];
 314    tnl->Driver.Render.Quad = quad_tab[ind];
 315    tnl->Driver.Render.Line = swsetup_line;
 316    tnl->Driver.Render.Points = swsetup_points;
 317 }