src/mesa/tnl_dd/t_dd_unfilled.h

   1 /*
   2  * Mesa 3-D graphics library
   3  *
   4  * Copyright (C) 1999-2006  Brian Paul   All Rights Reserved.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * copy of this software and associated documentation files (the "Software"),
   8  * to deal in the Software without restriction, including without limitation
   9  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  10  * and/or sell copies of the Software, and to permit persons to whom the
  11  * Software is furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included
  14  * in all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  17  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
  20  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  21  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  22  * OTHER DEALINGS IN THE SOFTWARE.
  23  *
  24  * Authors:
  25  *    Keith Whitwell <keithw@vmware.com>
  26  */
  27
  28 #if !HAVE_SPEC
  29 #define VERT_SET_SPEC( v, c )
  30 #define VERT_COPY_SPEC( v0, v1 )
  31 #define VERT_SAVE_SPEC( idx )
  32 #define VERT_RESTORE_SPEC( idx )
  33 #endif
  34
  35 static void TAG(unfilled_tri)( struct gl_context *ctx,
  36                                GLenum mode,
  37                                GLuint e0, GLuint e1, GLuint e2 )
  38 {
  39    struct vertex_buffer *VB = &TNL_CONTEXT(ctx)->vb;
  40    GLubyte *ef = VB->EdgeFlag;
  41    VERTEX *v[3];
  42    LOCAL_VARS(3);
  43
  44    v[0] = (VERTEX *)GET_VERTEX(e0);
  45    v[1] = (VERTEX *)GET_VERTEX(e1);
  46    v[2] = (VERTEX *)GET_VERTEX(e2);
  47
  48    if (ctx->Light.ShadeModel == GL_FLAT && HAVE_HW_FLATSHADE) {
  49       VERT_SAVE_RGBA(0);
  50       VERT_SAVE_RGBA(1);
  51       VERT_COPY_RGBA(v[0], v[2]);
  52       VERT_COPY_RGBA(v[1], v[2]);
  53
  54       if (HAVE_SPEC) {
  55          VERT_SAVE_SPEC(0);
  56          VERT_SAVE_SPEC(1);
  57          VERT_COPY_SPEC(v[0], v[2]);
  58          VERT_COPY_SPEC(v[1], v[2]);
  59       }
  60    }
  61
  62 /*     fprintf(stderr, "%s %s %d %d %d\n", __func__, */
  63 /*         _mesa_enum_to_string( mode ), */
  64 /*         ef[e0], ef[e1], ef[e2]); */
  65
  66    if (mode == GL_POINT) {
  67       RASTERIZE(GL_POINTS);
  68       if (ef[e0]) POINT( v[0] );
  69       if (ef[e1]) POINT( v[1] );
  70       if (ef[e2]) POINT( v[2] );
  71    }
  72    else {
  73       RASTERIZE(GL_LINES);
  74       if (RENDER_PRIMITIVE == GL_POLYGON) {
  75          if (ef[e2]) LINE( v[2], v[0] );
  76          if (ef[e0]) LINE( v[0], v[1] );
  77          if (ef[e1]) LINE( v[1], v[2] );
  78       }
  79       else {
  80          if (ef[e0]) LINE( v[0], v[1] );
  81          if (ef[e1]) LINE( v[1], v[2] );
  82          if (ef[e2]) LINE( v[2], v[0] );
  83       }
  84    }
  85
  86    if (ctx->Light.ShadeModel == GL_FLAT && HAVE_HW_FLATSHADE) {
  87       VERT_RESTORE_RGBA(0);
  88       VERT_RESTORE_RGBA(1);
  89
  90       if (HAVE_SPEC) {
  91          VERT_RESTORE_SPEC(0);
  92          VERT_RESTORE_SPEC(1);
  93       }
  94    }
  95 }
  96
  97
  98 static void TAG(unfilled_quad)( struct gl_context *ctx,
  99                                 GLenum mode,
 100                                 GLuint e0, GLuint e1,
 101                                 GLuint e2, GLuint e3 )
 102 {
 103    struct vertex_buffer *VB = &TNL_CONTEXT(ctx)->vb;
 104    GLubyte *ef = VB->EdgeFlag;
 105    VERTEX *v[4];
 106    LOCAL_VARS(4);
 107
 108    v[0] = (VERTEX *)GET_VERTEX(e0);
 109    v[1] = (VERTEX *)GET_VERTEX(e1);
 110    v[2] = (VERTEX *)GET_VERTEX(e2);
 111    v[3] = (VERTEX *)GET_VERTEX(e3);
 112
 113    /* Hardware flatshading breaks down here.  If the hardware doesn't
 114     * support flatshading, this will already have been done:
 115     */
 116    if (ctx->Light.ShadeModel == GL_FLAT && HAVE_HW_FLATSHADE) {
 117       VERT_SAVE_RGBA(0);
 118       VERT_SAVE_RGBA(1);
 119       VERT_SAVE_RGBA(2);
 120       VERT_COPY_RGBA(v[0], v[3]);
 121       VERT_COPY_RGBA(v[1], v[3]);
 122       VERT_COPY_RGBA(v[2], v[3]);
 123
 124       if (HAVE_SPEC) {
 125          VERT_SAVE_SPEC(0);
 126          VERT_SAVE_SPEC(1);
 127          VERT_SAVE_SPEC(2);
 128          VERT_COPY_SPEC(v[0], v[3]);
 129          VERT_COPY_SPEC(v[1], v[3]);
 130          VERT_COPY_SPEC(v[2], v[3]);
 131       }
 132    }
 133
 134    if (mode == GL_POINT) {
 135       RASTERIZE(GL_POINTS);
 136       if (ef[e0]) POINT( v[0] );
 137       if (ef[e1]) POINT( v[1] );
 138       if (ef[e2]) POINT( v[2] );
 139       if (ef[e3]) POINT( v[3] );
 140    }
 141    else {
 142       RASTERIZE(GL_LINES);
 143       if (ef[e0]) LINE( v[0], v[1] );
 144       if (ef[e1]) LINE( v[1], v[2] );
 145       if (ef[e2]) LINE( v[2], v[3] );
 146       if (ef[e3]) LINE( v[3], v[0] );
 147    }
 148
 149    if (ctx->Light.ShadeModel == GL_FLAT && HAVE_HW_FLATSHADE) {
 150       VERT_RESTORE_RGBA(0);
 151       VERT_RESTORE_RGBA(1);
 152       VERT_RESTORE_RGBA(2);
 153
 154       if (HAVE_SPEC) {
 155          VERT_RESTORE_SPEC(0);
 156          VERT_RESTORE_SPEC(1);
 157          VERT_RESTORE_SPEC(2);
 158       }
 159    }
 160 }
 161
 162
 163 #if !HAVE_SPEC
 164 #undef VERT_SET_SPEC
 165 #undef VERT_COPY_SPEC
 166 #undef VERT_SAVE_SPEC
 167 #undef VERT_RESTORE_SPEC
 168 #endif
 169
 170 #undef TAG