reactos/dll/opengl/mesa/src/mesa/swrast_setup/ss_tritmp.h

   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
  29 /**
  30  * This is where we handle assigning vertex colors based on front/back
  31  * facing, compute polygon offset and handle glPolygonMode().
  32  */
  33 static void TAG(triangle)(struct gl_context *ctx, GLuint e0, GLuint e1, GLuint e2 )
  34 {
  35 #if IND & SS_TWOSIDE_BIT
  36    struct vertex_buffer *VB = &TNL_CONTEXT(ctx)->vb;
  37    SScontext *swsetup = SWSETUP_CONTEXT(ctx);
  38    GLchan saved_color[3][4] = { { 0 } };
  39    GLfloat saved_col0[3][4] = { { 0 } };
  40    GLfloat saved_spec[3][4] = { { 0 } };
  41 #endif
  42    SWvertex *verts = SWSETUP_CONTEXT(ctx)->verts;
  43    SWvertex *v[3];
  44 #if IND & SS_OFFSET_BIT
  45    GLfloat z[3];
  46 #endif
  47    GLfloat oz0, oz1, oz2;
  48    GLenum mode = GL_FILL;
  49    GLuint facing = 0;
  50
  51    v[0] = &verts[e0];
  52    v[1] = &verts[e1];
  53    v[2] = &verts[e2];
  54
  55 #if IND & (SS_TWOSIDE_BIT | SS_OFFSET_BIT | SS_UNFILLED_BIT)
  56    {
  57       GLfloat ex = v[0]->attrib[FRAG_ATTRIB_WPOS][0] - v[2]->attrib[FRAG_ATTRIB_WPOS][0];
  58       GLfloat ey = v[0]->attrib[FRAG_ATTRIB_WPOS][1] - v[2]->attrib[FRAG_ATTRIB_WPOS][1];
  59       GLfloat fx = v[1]->attrib[FRAG_ATTRIB_WPOS][0] - v[2]->attrib[FRAG_ATTRIB_WPOS][0];
  60       GLfloat fy = v[1]->attrib[FRAG_ATTRIB_WPOS][1] - v[2]->attrib[FRAG_ATTRIB_WPOS][1];
  61       GLfloat cc  = ex*fy - ey*fx;
  62
  63 #if IND & (SS_TWOSIDE_BIT | SS_UNFILLED_BIT)
  64       {
  65          facing = (cc < 0.0) ^ ctx->Polygon._FrontBit;
  66
  67 #if IND & SS_UNFILLED_BIT
  68             mode = facing ? ctx->Polygon.BackMode : ctx->Polygon.FrontMode;
  69 #endif
  70
  71 #if IND & SS_TWOSIDE_BIT
  72          if (facing == 1) {
  73                if (VB->BackfaceColorPtr) {
  74                   GLfloat (*vbcolor)[4] = VB->BackfaceColorPtr->data;
  75
  76                   if (swsetup->intColors) {
  77                      COPY_CHAN4(saved_color[0], v[0]->color);
  78                      COPY_CHAN4(saved_color[1], v[1]->color);
  79                      COPY_CHAN4(saved_color[2], v[2]->color);
  80                   }
  81                   else {
  82                      COPY_4V(saved_col0[0], v[0]->attrib[FRAG_ATTRIB_COL0]);
  83                      COPY_4V(saved_col0[1], v[1]->attrib[FRAG_ATTRIB_COL0]);
  84                      COPY_4V(saved_col0[2], v[2]->attrib[FRAG_ATTRIB_COL0]);
  85                   }
  86
  87                   if (VB->BackfaceColorPtr->stride) {
  88                      if (swsetup->intColors) {
  89                         SS_COLOR(v[0]->color, vbcolor[e0]);
  90                         SS_COLOR(v[1]->color, vbcolor[e1]);
  91                         SS_COLOR(v[2]->color, vbcolor[e2]);
  92                      }
  93                      else {
  94                         COPY_4V(v[0]->attrib[FRAG_ATTRIB_COL0], vbcolor[e0]);
  95                         COPY_4V(v[1]->attrib[FRAG_ATTRIB_COL0], vbcolor[e1]);
  96                         COPY_4V(v[2]->attrib[FRAG_ATTRIB_COL0], vbcolor[e2]);
  97                      }
  98                   }
  99                   else {
 100                      /* flat shade */
 101                      if (swsetup->intColors) {
 102                         SS_COLOR(v[0]->color, vbcolor[0]);
 103                         SS_COLOR(v[1]->color, vbcolor[0]);
 104                         SS_COLOR(v[2]->color, vbcolor[0]);
 105                      }
 106                      else {
 107                         COPY_4V(v[0]->attrib[FRAG_ATTRIB_COL0], vbcolor[0]);
 108                         COPY_4V(v[1]->attrib[FRAG_ATTRIB_COL0], vbcolor[0]);
 109                         COPY_4V(v[2]->attrib[FRAG_ATTRIB_COL0], vbcolor[0]);
 110                      }
 111                   }
 112                }
 113
 114                if (VB->BackfaceSecondaryColorPtr) {
 115                   GLfloat (*vbspec)[4] = VB->BackfaceSecondaryColorPtr->data;
 116
 117                   COPY_4V(saved_spec[0], v[0]->attrib[FRAG_ATTRIB_COL1]);
 118                   COPY_4V(saved_spec[1], v[1]->attrib[FRAG_ATTRIB_COL1]);
 119                   COPY_4V(saved_spec[2], v[2]->attrib[FRAG_ATTRIB_COL1]);
 120
 121                   if (VB->BackfaceSecondaryColorPtr->stride) {
 122                     SS_SPEC(v[0]->attrib[FRAG_ATTRIB_COL1], vbspec[e0]);
 123                     SS_SPEC(v[1]->attrib[FRAG_ATTRIB_COL1], vbspec[e1]);
 124                     SS_SPEC(v[2]->attrib[FRAG_ATTRIB_COL1], vbspec[e2]);
 125                   }
 126                   else {
 127                     SS_SPEC(v[0]->attrib[FRAG_ATTRIB_COL1], vbspec[0]);
 128                     SS_SPEC(v[1]->attrib[FRAG_ATTRIB_COL1], vbspec[0]);
 129                     SS_SPEC(v[2]->attrib[FRAG_ATTRIB_COL1], vbspec[0]);
 130                   }
 131                }
 132             }
 133 #endif
 134       }
 135 #endif
 136
 137 #if IND & SS_OFFSET_BIT
 138       {
 139          GLfloat offset;
 140          const GLfloat max = ctx->DrawBuffer->_DepthMaxF;
 141          /* save original Z values (restored later) */
 142          z[0] = v[0]->attrib[FRAG_ATTRIB_WPOS][2];
 143          z[1] = v[1]->attrib[FRAG_ATTRIB_WPOS][2];
 144          z[2] = v[2]->attrib[FRAG_ATTRIB_WPOS][2];
 145          /* Note that Z values are already scaled to [0,65535] (for example)
 146           * so no MRD value is used here.
 147           */
 148          offset = ctx->Polygon.OffsetUnits;
 149          if (cc * cc > 1e-16) {
 150             const GLfloat ez = z[0] - z[2];
 151             const GLfloat fz = z[1] - z[2];
 152             const GLfloat oneOverArea = 1.0F / cc;
 153             const GLfloat dzdx = FABSF((ey * fz - ez * fy) * oneOverArea);
 154             const GLfloat dzdy = FABSF((ez * fx - ex * fz) * oneOverArea);
 155             offset += MAX2(dzdx, dzdy) * ctx->Polygon.OffsetFactor;
 156          }
 157          /* new Z values */
 158          oz0 = CLAMP(v[0]->attrib[FRAG_ATTRIB_WPOS][2] + offset, 0.0F, max);
 159          oz1 = CLAMP(v[1]->attrib[FRAG_ATTRIB_WPOS][2] + offset, 0.0F, max);
 160          oz2 = CLAMP(v[2]->attrib[FRAG_ATTRIB_WPOS][2] + offset, 0.0F, max);
 161       }
 162 #endif
 163    }
 164 #endif
 165
 166    if (mode == GL_POINT) {
 167       if ((IND & SS_OFFSET_BIT) && ctx->Polygon.OffsetPoint) {
 168          v[0]->attrib[FRAG_ATTRIB_WPOS][2] = oz0;
 169          v[1]->attrib[FRAG_ATTRIB_WPOS][2] = oz1;
 170          v[2]->attrib[FRAG_ATTRIB_WPOS][2] = oz2;
 171       }
 172       _swsetup_render_tri(ctx, e0, e1, e2, facing, _swsetup_edge_render_point_tri);
 173    } else if (mode == GL_LINE) {
 174       if ((IND & SS_OFFSET_BIT) && ctx->Polygon.OffsetLine) {
 175          v[0]->attrib[FRAG_ATTRIB_WPOS][2] = oz0;
 176          v[1]->attrib[FRAG_ATTRIB_WPOS][2] = oz1;
 177          v[2]->attrib[FRAG_ATTRIB_WPOS][2] = oz2;
 178       }
 179       _swsetup_render_tri(ctx, e0, e1, e2, facing, _swsetup_edge_render_line_tri);
 180    }
 181    else {
 182 #if IND & SS_OFFSET_BIT
 183       if (ctx->Polygon.OffsetFill) {
 184          v[0]->attrib[FRAG_ATTRIB_WPOS][2] = oz0;
 185          v[1]->attrib[FRAG_ATTRIB_WPOS][2] = oz1;
 186          v[2]->attrib[FRAG_ATTRIB_WPOS][2] = oz2;
 187       }
 188 #endif
 189       _swrast_Triangle( ctx, v[0], v[1], v[2] );
 190    }
 191
 192    /*
 193     * Restore original vertex colors, etc.
 194     */
 195 #if IND & SS_OFFSET_BIT
 196    {
 197       v[0]->attrib[FRAG_ATTRIB_WPOS][2] = z[0];
 198       v[1]->attrib[FRAG_ATTRIB_WPOS][2] = z[1];
 199       v[2]->attrib[FRAG_ATTRIB_WPOS][2] = z[2];
 200    }
 201 #endif
 202
 203 #if IND & SS_TWOSIDE_BIT
 204    {
 205       if (facing == 1) {
 206         if (VB->BackfaceColorPtr) {
 207           if (swsetup->intColors) {
 208             COPY_CHAN4(v[0]->color, saved_color[0]);
 209             COPY_CHAN4(v[1]->color, saved_color[1]);
 210             COPY_CHAN4(v[2]->color, saved_color[2]);
 211           }
 212           else {
 213             COPY_4V(v[0]->attrib[FRAG_ATTRIB_COL0], saved_col0[0]);
 214             COPY_4V(v[1]->attrib[FRAG_ATTRIB_COL0], saved_col0[1]);
 215             COPY_4V(v[2]->attrib[FRAG_ATTRIB_COL0], saved_col0[2]);
 216           }
 217         }
 218
 219         if (VB->BackfaceSecondaryColorPtr) {
 220           COPY_4V(v[0]->attrib[FRAG_ATTRIB_COL1], saved_spec[0]);
 221           COPY_4V(v[1]->attrib[FRAG_ATTRIB_COL1], saved_spec[1]);
 222           COPY_4V(v[2]->attrib[FRAG_ATTRIB_COL1], saved_spec[2]);
 223         }
 224       }
 225    }
 226 #endif
 227 }
 228
 229
 230
 231 /* Need to fixup edgeflags when decomposing to triangles:
 232  */
 233 static void TAG(quadfunc)( struct gl_context *ctx, GLuint v0,
 234                        GLuint v1, GLuint v2, GLuint v3 )
 235 {
 236    if (IND & SS_UNFILLED_BIT) {
 237       struct vertex_buffer *VB = &TNL_CONTEXT(ctx)->vb;
 238       if (VB->EdgeFlag) { /* XXX this test shouldn't be needed (bug 12614) */
 239          GLubyte ef1 = VB->EdgeFlag[v1];
 240          GLubyte ef3 = VB->EdgeFlag[v3];
 241          VB->EdgeFlag[v1] = 0;
 242          TAG(triangle)( ctx, v0, v1, v3 );
 243          VB->EdgeFlag[v1] = ef1;
 244          VB->EdgeFlag[v3] = 0;
 245          TAG(triangle)( ctx, v1, v2, v3 );
 246          VB->EdgeFlag[v3] = ef3;
 247       }
 248    } else {
 249       TAG(triangle)( ctx, v0, v1, v3 );
 250       TAG(triangle)( ctx, v1, v2, v3 );
 251    }
 252 }
 253
 254
 255
 256
 257 static void TAG(init)( void )
 258 {
 259    tri_tab[IND] = TAG(triangle);
 260    quad_tab[IND] = TAG(quadfunc);
 261 }
 262
 263
 264 #undef IND
 265 #undef TAG