ReactOS Development > Doxygen

00001 /*
00002  * Mesa 3-D graphics library
00003  * Version:  7.1
00004  *
00005  * Copyright (C) 1999-2007  Brian Paul   All Rights Reserved.
00006  *
00007  * Permission is hereby granted, free of charge, to any person obtaining a
00008  * copy of this software and associated documentation files (the "Software"),
00009  * to deal in the Software without restriction, including without limitation
00010  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
00011  * and/or sell copies of the Software, and to permit persons to whom the
00012  * Software is furnished to do so, subject to the following conditions:
00013  *
00014  * The above copyright notice and this permission notice shall be included
00015  * in all copies or substantial portions of the Software.
00016  *
00017  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
00018  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
00019  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
00020  * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
00021  * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
00022  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
00023  *
00024  * Authors:
00025  *    Keith Whitwell <keith@tungstengraphics.com>
00026  */
00027 
00028 #include "main/glheader.h"
00029 #include "main/colormac.h"
00030 #include "main/macros.h"
00031 #include "main/mtypes.h"
00032 
00033 #include "tnl/t_context.h"
00034 
00035 #include "ss_triangle.h"
00036 #include "ss_context.h"
00037 
00038 #define SS_RGBA_BIT         0x1
00039 #define SS_OFFSET_BIT       0x2
00040 #define SS_TWOSIDE_BIT      0x4
00041 #define SS_UNFILLED_BIT     0x8
00042 #define SS_MAX_TRIFUNC      0x10
00043 
00044 static tnl_triangle_func tri_tab[SS_MAX_TRIFUNC];
00045 static tnl_quad_func     quad_tab[SS_MAX_TRIFUNC];
00046 
00047 
00048 static void _swsetup_render_line_tri( GLcontext *ctx,
00049                       GLuint e0, GLuint e1, GLuint e2,
00050                                       GLuint facing )
00051 {
00052    SScontext *swsetup = SWSETUP_CONTEXT(ctx);
00053    struct vertex_buffer *VB = &TNL_CONTEXT(ctx)->vb;
00054    GLubyte *ef = VB->EdgeFlag;
00055    SWvertex *verts = swsetup->verts;
00056    SWvertex *v0 = &verts[e0];
00057    SWvertex *v1 = &verts[e1];
00058    SWvertex *v2 = &verts[e2];
00059    GLchan c[2][4];
00060    GLfloat s[2][4];
00061    GLfloat i[2];
00062 
00063    /* cull testing */
00064    if (ctx->Polygon.CullFlag) {
00065       if (facing == 1 && ctx->Polygon.CullFaceMode != GL_FRONT)
00066          return;
00067       if (facing == 0 && ctx->Polygon.CullFaceMode != GL_BACK)
00068          return;
00069    }
00070 
00071    _swrast_SetFacing(ctx, facing);
00072 
00073    if (ctx->Light.ShadeModel == GL_FLAT) {
00074       COPY_CHAN4(c[0], v0->color);
00075       COPY_CHAN4(c[1], v1->color);
00076       COPY_4V(s[0], v0->attrib[FRAG_ATTRIB_COL1]);
00077       COPY_4V(s[1], v1->attrib[FRAG_ATTRIB_COL1]);
00078       i[0] = v0->attrib[FRAG_ATTRIB_CI][0];
00079       i[1] = v1->attrib[FRAG_ATTRIB_CI][0];
00080 
00081       COPY_CHAN4(v0->color, v2->color);
00082       COPY_CHAN4(v1->color, v2->color);
00083       COPY_4V(v0->attrib[FRAG_ATTRIB_COL1], v2->attrib[FRAG_ATTRIB_COL1]);
00084       COPY_4V(v1->attrib[FRAG_ATTRIB_COL1], v2->attrib[FRAG_ATTRIB_COL1]);
00085       v0->attrib[FRAG_ATTRIB_CI][0] = v2->attrib[FRAG_ATTRIB_CI][0];
00086       v1->attrib[FRAG_ATTRIB_CI][0] = v2->attrib[FRAG_ATTRIB_CI][0];
00087    }
00088 
00089    if (swsetup->render_prim == GL_POLYGON) {
00090       if (ef[e2]) _swrast_Line( ctx, v2, v0 );
00091       if (ef[e0]) _swrast_Line( ctx, v0, v1 );
00092       if (ef[e1]) _swrast_Line( ctx, v1, v2 );
00093    } else {
00094       if (ef[e0]) _swrast_Line( ctx, v0, v1 );
00095       if (ef[e1]) _swrast_Line( ctx, v1, v2 );
00096       if (ef[e2]) _swrast_Line( ctx, v2, v0 );
00097    }
00098 
00099    if (ctx->Light.ShadeModel == GL_FLAT) {
00100       COPY_CHAN4(v0->color, c[0]);
00101       COPY_CHAN4(v1->color, c[1]);
00102       COPY_4V(v0->attrib[FRAG_ATTRIB_COL1], s[0]);
00103       COPY_4V(v1->attrib[FRAG_ATTRIB_COL1], s[1]);
00104       v0->attrib[FRAG_ATTRIB_CI][0] = i[0];
00105       v1->attrib[FRAG_ATTRIB_CI][0] = i[1];
00106    }
00107 }
00108 
00109 static void _swsetup_render_point_tri( GLcontext *ctx,
00110                        GLuint e0, GLuint e1, GLuint e2,
00111                                        GLuint facing )
00112 {
00113    SScontext *swsetup = SWSETUP_CONTEXT(ctx);
00114    struct vertex_buffer *VB = &TNL_CONTEXT(ctx)->vb;
00115    GLubyte *ef = VB->EdgeFlag;
00116    SWvertex *verts = swsetup->verts;
00117    SWvertex *v0 = &verts[e0];
00118    SWvertex *v1 = &verts[e1];
00119    SWvertex *v2 = &verts[e2];
00120    GLchan c[2][4];
00121    GLfloat s[2][4];
00122    GLfloat i[2];
00123 
00124    /* cull testing */
00125    if (ctx->Polygon.CullFlag) {
00126       if (facing == 1 && ctx->Polygon.CullFaceMode != GL_FRONT)
00127          return;
00128       if (facing == 0 && ctx->Polygon.CullFaceMode != GL_BACK)
00129          return;
00130    }
00131 
00132    _swrast_SetFacing(ctx, facing);
00133 
00134    if (ctx->Light.ShadeModel == GL_FLAT) {
00135       /* save colors/indexes for v0, v1 vertices */
00136       COPY_CHAN4(c[0], v0->color);
00137       COPY_CHAN4(c[1], v1->color);
00138       COPY_4V(s[0], v0->attrib[FRAG_ATTRIB_COL1]);
00139       COPY_4V(s[1], v1->attrib[FRAG_ATTRIB_COL1]);
00140       i[0] = v0->attrib[FRAG_ATTRIB_CI][0];
00141       i[1] = v1->attrib[FRAG_ATTRIB_CI][0];
00142 
00143       /* copy v2 color/indexes to v0, v1 indexes */
00144       COPY_CHAN4(v0->color, v2->color);
00145       COPY_CHAN4(v1->color, v2->color);
00146       COPY_4V(v0->attrib[FRAG_ATTRIB_COL1], v2->attrib[FRAG_ATTRIB_COL1]);
00147       COPY_4V(v1->attrib[FRAG_ATTRIB_COL1], v2->attrib[FRAG_ATTRIB_COL1]);
00148       v0->attrib[FRAG_ATTRIB_CI][0] = v2->attrib[FRAG_ATTRIB_CI][0];
00149       v1->attrib[FRAG_ATTRIB_CI][0] = v2->attrib[FRAG_ATTRIB_CI][0];
00150    }
00151 
00152    if (ef[e0]) _swrast_Point( ctx, v0 );
00153    if (ef[e1]) _swrast_Point( ctx, v1 );
00154    if (ef[e2]) _swrast_Point( ctx, v2 );
00155 
00156    if (ctx->Light.ShadeModel == GL_FLAT) {
00157       /* restore v0, v1 colores/indexes */
00158       COPY_CHAN4(v0->color, c[0]);
00159       COPY_CHAN4(v1->color, c[1]);
00160       COPY_4V(v0->attrib[FRAG_ATTRIB_COL1], s[0]);
00161       COPY_4V(v1->attrib[FRAG_ATTRIB_COL1], s[1]);
00162       v0->attrib[FRAG_ATTRIB_CI][0] = i[0];
00163       v1->attrib[FRAG_ATTRIB_CI][0] = i[1];
00164    }
00165    _swrast_flush(ctx);
00166 }
00167 
00168 #define SS_COLOR(a,b) UNCLAMPED_FLOAT_TO_RGBA_CHAN(a,b)
00169 #define SS_SPEC(a,b) UNCLAMPED_FLOAT_TO_RGB_CHAN(a,b)
00170 #define SS_IND(a,b) (a = b)
00171 
00172 #define IND (0)
00173 #define TAG(x) x
00174 #include "ss_tritmp.h"
00175 
00176 #define IND (SS_OFFSET_BIT)
00177 #define TAG(x) x##_offset
00178 #include "ss_tritmp.h"
00179 
00180 #define IND (SS_TWOSIDE_BIT)
00181 #define TAG(x) x##_twoside
00182 #include "ss_tritmp.h"
00183 
00184 #define IND (SS_OFFSET_BIT|SS_TWOSIDE_BIT)
00185 #define TAG(x) x##_offset_twoside
00186 #include "ss_tritmp.h"
00187 
00188 #define IND (SS_UNFILLED_BIT)
00189 #define TAG(x) x##_unfilled
00190 #include "ss_tritmp.h"
00191 
00192 #define IND (SS_OFFSET_BIT|SS_UNFILLED_BIT)
00193 #define TAG(x) x##_offset_unfilled
00194 #include "ss_tritmp.h"
00195 
00196 #define IND (SS_TWOSIDE_BIT|SS_UNFILLED_BIT)
00197 #define TAG(x) x##_twoside_unfilled
00198 #include "ss_tritmp.h"
00199 
00200 #define IND (SS_OFFSET_BIT|SS_TWOSIDE_BIT|SS_UNFILLED_BIT)
00201 #define TAG(x) x##_offset_twoside_unfilled
00202 #include "ss_tritmp.h"
00203 
00204 #define IND (0|SS_RGBA_BIT)
00205 #define TAG(x) x##_rgba
00206 #include "ss_tritmp.h"
00207 
00208 #define IND (SS_OFFSET_BIT|SS_RGBA_BIT)
00209 #define TAG(x) x##_offset_rgba
00210 #include "ss_tritmp.h"
00211 
00212 #define IND (SS_TWOSIDE_BIT|SS_RGBA_BIT)
00213 #define TAG(x) x##_twoside_rgba
00214 #include "ss_tritmp.h"
00215 
00216 #define IND (SS_OFFSET_BIT|SS_TWOSIDE_BIT|SS_RGBA_BIT)
00217 #define TAG(x) x##_offset_twoside_rgba
00218 #include "ss_tritmp.h"
00219 
00220 #define IND (SS_UNFILLED_BIT|SS_RGBA_BIT)
00221 #define TAG(x) x##_unfilled_rgba
00222 #include "ss_tritmp.h"
00223 
00224 #define IND (SS_OFFSET_BIT|SS_UNFILLED_BIT|SS_RGBA_BIT)
00225 #define TAG(x) x##_offset_unfilled_rgba
00226 #include "ss_tritmp.h"
00227 
00228 #define IND (SS_TWOSIDE_BIT|SS_UNFILLED_BIT|SS_RGBA_BIT)
00229 #define TAG(x) x##_twoside_unfilled_rgba
00230 #include "ss_tritmp.h"
00231 
00232 #define IND (SS_OFFSET_BIT|SS_TWOSIDE_BIT|SS_UNFILLED_BIT|SS_RGBA_BIT)
00233 #define TAG(x) x##_offset_twoside_unfilled_rgba
00234 #include "ss_tritmp.h"
00235 
00236 
00237 void _swsetup_trifuncs_init( GLcontext *ctx )
00238 {
00239    (void) ctx;
00240 
00241    init();
00242    init_offset();
00243    init_twoside();
00244    init_offset_twoside();
00245    init_unfilled();
00246    init_offset_unfilled();
00247    init_twoside_unfilled();
00248    init_offset_twoside_unfilled();
00249 
00250    init_rgba();
00251    init_offset_rgba();
00252    init_twoside_rgba();
00253    init_offset_twoside_rgba();
00254    init_unfilled_rgba();
00255    init_offset_unfilled_rgba();
00256    init_twoside_unfilled_rgba();
00257    init_offset_twoside_unfilled_rgba();
00258 }
00259 
00260 
00261 static void swsetup_points( GLcontext *ctx, GLuint first, GLuint last )
00262 {
00263    struct vertex_buffer *VB = &TNL_CONTEXT(ctx)->vb;
00264    SWvertex *verts = SWSETUP_CONTEXT(ctx)->verts;
00265    GLuint i;
00266 
00267    if (VB->Elts) {
00268       for (i = first; i < last; i++)
00269      if (VB->ClipMask[VB->Elts[i]] == 0)
00270         _swrast_Point( ctx, &verts[VB->Elts[i]] );
00271    }
00272    else {
00273       for (i = first; i < last; i++)
00274      if (VB->ClipMask[i] == 0)
00275         _swrast_Point( ctx, &verts[i] );
00276    }
00277 }
00278 
00279 static void swsetup_line( GLcontext *ctx, GLuint v0, GLuint v1 )
00280 {
00281    SWvertex *verts = SWSETUP_CONTEXT(ctx)->verts;
00282    _swrast_Line( ctx, &verts[v0], &verts[v1] );
00283 }
00284 
00285 
00286 
00287 void _swsetup_choose_trifuncs( GLcontext *ctx )
00288 {
00289    TNLcontext *tnl = TNL_CONTEXT(ctx);
00290    GLuint ind = 0;
00291 
00292    if (ctx->Polygon.OffsetPoint ||
00293        ctx->Polygon.OffsetLine ||
00294        ctx->Polygon.OffsetFill)
00295       ind |= SS_OFFSET_BIT;
00296 
00297    if ((ctx->Light.Enabled && ctx->Light.Model.TwoSide) ||
00298        (ctx->VertexProgram._Current && ctx->VertexProgram.TwoSideEnabled))
00299       ind |= SS_TWOSIDE_BIT;
00300 
00301    /* We piggyback the two-sided stencil front/back determination on the
00302     * unfilled triangle path.
00303     */
00304    if (ctx->Polygon.FrontMode != GL_FILL ||
00305        ctx->Polygon.BackMode != GL_FILL ||
00306        (ctx->Stencil.Enabled && ctx->Stencil._TestTwoSide))
00307       ind |= SS_UNFILLED_BIT;
00308 
00309    if (ctx->Visual.rgbMode)
00310       ind |= SS_RGBA_BIT;
00311 
00312    tnl->Driver.Render.Triangle = tri_tab[ind];
00313    tnl->Driver.Render.Quad = quad_tab[ind];
00314    tnl->Driver.Render.Line = swsetup_line;
00315    tnl->Driver.Render.Points = swsetup_points;
00316 }
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