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  * THE AUTHORS 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_OFFSET_BIT       0x1
  39 #define SS_TWOSIDE_BIT      0x2
  40 #define SS_UNFILLED_BIT     0x4
  41 #define SS_MAX_TRIFUNC      0x8
  42
  43 static tnl_triangle_func tri_tab[SS_MAX_TRIFUNC];
  44 static tnl_quad_func     quad_tab[SS_MAX_TRIFUNC];
  45
  46
  47 /*
  48  * Render a triangle respecting edge flags.
  49  */
  50 typedef void (* swsetup_edge_render_prim_tri)(struct gl_context *ctx,
  51                                               const GLubyte *ef,
  52                                               GLuint e0,
  53                                               GLuint e1,
  54                                               GLuint e2,
  55                                               const SWvertex *v0,
  56                                               const SWvertex *v1,
  57                                               const SWvertex *v2);
  58
  59 /*
  60  * Render a triangle using lines and respecting edge flags.
  61  */
  62 static void
  63 _swsetup_edge_render_line_tri(struct gl_context *ctx,
  64                               const GLubyte *ef,
  65                               GLuint e0,
  66                               GLuint e1,
  67                               GLuint e2,
  68                               const SWvertex *v0,
  69                               const SWvertex *v1,
  70                               const SWvertex *v2)
  71 {
  72    SScontext *swsetup = SWSETUP_CONTEXT(ctx);
  73
  74    if (swsetup->render_prim == GL_POLYGON) {
  75       if (ef[e2]) _swrast_Line( ctx, v2, v0 );
  76       if (ef[e0]) _swrast_Line( ctx, v0, v1 );
  77       if (ef[e1]) _swrast_Line( ctx, v1, v2 );
  78    } else {
  79       if (ef[e0]) _swrast_Line( ctx, v0, v1 );
  80       if (ef[e1]) _swrast_Line( ctx, v1, v2 );
  81       if (ef[e2]) _swrast_Line( ctx, v2, v0 );
  82    }
  83 }
  84
  85 /*
  86  * Render a triangle using points and respecting edge flags.
  87  */
  88 static void
  89 _swsetup_edge_render_point_tri(struct gl_context *ctx,
  90                                const GLubyte *ef,
  91                                GLuint e0,
  92                                GLuint e1,
  93                                GLuint e2,
  94                                const SWvertex *v0,
  95                                const SWvertex *v1,
  96                                const SWvertex *v2)
  97 {
  98    if (ef[e0]) _swrast_Point( ctx, v0 );
  99    if (ef[e1]) _swrast_Point( ctx, v1 );
 100    if (ef[e2]) _swrast_Point( ctx, v2 );
 101
 102    _swrast_flush(ctx);
 103 }
 104
 105 /*
 106  * Render a triangle respecting cull and shade model.
 107  */
 108 static void _swsetup_render_tri(struct gl_context *ctx,
 109                                 GLuint e0,
 110                                 GLuint e1,
 111                                 GLuint e2,
 112                                 GLuint facing,
 113                                 swsetup_edge_render_prim_tri render)
 114 {
 115    SScontext *swsetup = SWSETUP_CONTEXT(ctx);
 116    struct vertex_buffer *VB = &TNL_CONTEXT(ctx)->vb;
 117    GLubyte *ef = VB->EdgeFlag;
 118    SWvertex *verts = swsetup->verts;
 119    SWvertex *v0 = &verts[e0];
 120    SWvertex *v1 = &verts[e1];
 121    SWvertex *v2 = &verts[e2];
 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    _swrast_SetFacing(ctx, facing);
 132
 133    if (ctx->Light.ShadeModel == GL_FLAT) {
 134       GLchan c[2][4];
 135       GLfloat s[2][4];
 136
 137       /* save colors/indexes for v0, v1 vertices */
 138       COPY_CHAN4(c[0], v0->color);
 139       COPY_CHAN4(c[1], v1->color);
 140       COPY_4V(s[0], v0->attrib[VARYING_SLOT_COL1]);
 141       COPY_4V(s[1], v1->attrib[VARYING_SLOT_COL1]);
 142
 143       /* copy v2 color/indexes to v0, v1 indexes */
 144       COPY_CHAN4(v0->color, v2->color);
 145       COPY_CHAN4(v1->color, v2->color);
 146       COPY_4V(v0->attrib[VARYING_SLOT_COL1], v2->attrib[VARYING_SLOT_COL1]);
 147       COPY_4V(v1->attrib[VARYING_SLOT_COL1], v2->attrib[VARYING_SLOT_COL1]);
 148
 149       render(ctx, ef, e0, e1, e2, v0, v1, v2);
 150
 151       COPY_CHAN4(v0->color, c[0]);
 152       COPY_CHAN4(v1->color, c[1]);
 153       COPY_4V(v0->attrib[VARYING_SLOT_COL1], s[0]);
 154       COPY_4V(v1->attrib[VARYING_SLOT_COL1], s[1]);
 155    }
 156    else {
 157       render(ctx, ef, e0, e1, e2, v0, v1, v2);
 158    }
 159 }
 160
 161 #define SS_COLOR(a,b) UNCLAMPED_FLOAT_TO_RGBA_CHAN(a,b)
 162 #define SS_SPEC(a,b) COPY_4V(a,b)
 163 #define SS_IND(a,b) (a = b)
 164
 165 #define IND (0)
 166 #define TAG(x) x##_rgba
 167 #include "ss_tritmp.h"
 168
 169 #define IND (SS_OFFSET_BIT)
 170 #define TAG(x) x##_offset_rgba
 171 #include "ss_tritmp.h"
 172
 173 #define IND (SS_TWOSIDE_BIT)
 174 #define TAG(x) x##_twoside_rgba
 175 #include "ss_tritmp.h"
 176
 177 #define IND (SS_OFFSET_BIT|SS_TWOSIDE_BIT)
 178 #define TAG(x) x##_offset_twoside_rgba
 179 #include "ss_tritmp.h"
 180
 181 #define IND (SS_UNFILLED_BIT)
 182 #define TAG(x) x##_unfilled_rgba
 183 #include "ss_tritmp.h"
 184
 185 #define IND (SS_OFFSET_BIT|SS_UNFILLED_BIT)
 186 #define TAG(x) x##_offset_unfilled_rgba
 187 #include "ss_tritmp.h"
 188
 189 #define IND (SS_TWOSIDE_BIT|SS_UNFILLED_BIT)
 190 #define TAG(x) x##_twoside_unfilled_rgba
 191 #include "ss_tritmp.h"
 192
 193 #define IND (SS_OFFSET_BIT|SS_TWOSIDE_BIT|SS_UNFILLED_BIT)
 194 #define TAG(x) x##_offset_twoside_unfilled_rgba
 195 #include "ss_tritmp.h"
 196
 197
 198 void _swsetup_trifuncs_init( struct gl_context *ctx )
 199 {
 200    (void) ctx;
 201
 202    init_rgba();
 203    init_offset_rgba();
 204    init_twoside_rgba();
 205    init_offset_twoside_rgba();
 206    init_unfilled_rgba();
 207    init_offset_unfilled_rgba();
 208    init_twoside_unfilled_rgba();
 209    init_offset_twoside_unfilled_rgba();
 210 }
 211
 212
 213 static void swsetup_points( struct gl_context *ctx, GLuint first, GLuint last )
 214 {
 215    struct vertex_buffer *VB = &TNL_CONTEXT(ctx)->vb;
 216    SWvertex *verts = SWSETUP_CONTEXT(ctx)->verts;
 217    GLuint i;
 218
 219    if (VB->Elts) {
 220       for (i = first; i < last; i++)
 221          if (VB->ClipMask[VB->Elts[i]] == 0)
 222             _swrast_Point( ctx, &verts[VB->Elts[i]] );
 223    }
 224    else {
 225       for (i = first; i < last; i++)
 226          if (VB->ClipMask[i] == 0)
 227             _swrast_Point( ctx, &verts[i] );
 228    }
 229 }
 230
 231 static void swsetup_line( struct gl_context *ctx, GLuint v0, GLuint v1 )
 232 {
 233    SWvertex *verts = SWSETUP_CONTEXT(ctx)->verts;
 234    _swrast_Line( ctx, &verts[v0], &verts[v1] );
 235 }
 236
 237
 238
 239 void _swsetup_choose_trifuncs( struct gl_context *ctx )
 240 {
 241    TNLcontext *tnl = TNL_CONTEXT(ctx);
 242    GLuint ind = 0;
 243
 244    if (ctx->Polygon.OffsetPoint ||
 245        ctx->Polygon.OffsetLine ||
 246        ctx->Polygon.OffsetFill)
 247       ind |= SS_OFFSET_BIT;
 248
 249    if ((ctx->Light.Enabled && ctx->Light.Model.TwoSide) ||
 250        (ctx->VertexProgram._Current && ctx->VertexProgram.TwoSideEnabled))
 251       ind |= SS_TWOSIDE_BIT;
 252
 253    /* We piggyback the two-sided stencil front/back determination on the
 254     * unfilled triangle path.
 255     */
 256    if (ctx->Polygon.FrontMode != GL_FILL ||
 257        ctx->Polygon.BackMode != GL_FILL ||
 258        (ctx->Stencil.Enabled && ctx->Stencil._TestTwoSide))
 259       ind |= SS_UNFILLED_BIT;
 260
 261    tnl->Driver.Render.Triangle = tri_tab[ind];
 262    tnl->Driver.Render.Quad = quad_tab[ind];
 263    tnl->Driver.Render.Line = swsetup_line;
 264    tnl->Driver.Render.Points = swsetup_points;
 265 }