src/mesa/swrast/s_feedback.c

   1 /*
   2  * Mesa 3-D graphics library
   3  * Version:  6.3
   4  *
   5  * Copyright (C) 1999-2005  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
  25 #include "glheader.h"
  26 #include "colormac.h"
  27 #include "context.h"
  28 #include "enums.h"
  29 #include "feedback.h"
  30 #include "macros.h"
  31
  32 #include "s_context.h"
  33 #include "s_feedback.h"
  34 #include "s_triangle.h"
  35
  36
  37 #define FB_3D           0x01
  38 #define FB_4D           0x02
  39 #define FB_INDEX        0x04
  40 #define FB_COLOR        0x08
  41 #define FB_TEXTURE      0X10
  42
  43
  44
  45
  46 static void feedback_vertex( GLcontext *ctx,
  47                              const SWvertex *v, const SWvertex *pv )
  48 {
  49    GLfloat win[4];
  50    GLfloat color[4];
  51    GLfloat tc[4];
  52    const GLfloat *vtc = v->attrib[FRAG_ATTRIB_TEX0];
  53
  54    win[0] = v->win[0];
  55    win[1] = v->win[1];
  56    win[2] = v->win[2] / ctx->DrawBuffer->_DepthMaxF;
  57    win[3] = 1.0F / v->win[3];
  58
  59    color[0] = CHAN_TO_FLOAT(pv->color[0]);
  60    color[1] = CHAN_TO_FLOAT(pv->color[1]);
  61    color[2] = CHAN_TO_FLOAT(pv->color[2]);
  62    color[3] = CHAN_TO_FLOAT(pv->color[3]);
  63
  64    if (vtc[3] != 1.0 && vtc[3] != 0.0) {
  65       GLfloat invq = 1.0F / vtc[3];
  66       tc[0] = vtc[0] * invq;
  67       tc[1] = vtc[1] * invq;
  68       tc[2] = vtc[2] * invq;
  69       tc[3] = vtc[3];
  70    }
  71    else {
  72       COPY_4V(tc, vtc);
  73    }
  74
  75    _mesa_feedback_vertex( ctx, win, color, (GLfloat) v->index, tc );
  76 }
  77
  78
  79 /*
  80  * Put triangle in feedback buffer.
  81  */
  82 void _swrast_feedback_triangle( GLcontext *ctx,
  83                            const SWvertex *v0,
  84                            const SWvertex *v1,
  85                            const SWvertex *v2)
  86 {
  87    if (_swrast_culltriangle( ctx, v0, v1, v2 )) {
  88       FEEDBACK_TOKEN( ctx, (GLfloat) (GLint) GL_POLYGON_TOKEN );
  89       FEEDBACK_TOKEN( ctx, (GLfloat) 3 );        /* three vertices */
  90
  91       if (ctx->Light.ShadeModel == GL_SMOOTH) {
  92          feedback_vertex( ctx, v0, v0 );
  93          feedback_vertex( ctx, v1, v1 );
  94          feedback_vertex( ctx, v2, v2 );
  95       } else {
  96          feedback_vertex( ctx, v0, v2 );
  97          feedback_vertex( ctx, v1, v2 );
  98          feedback_vertex( ctx, v2, v2 );
  99       }
 100    }
 101 }
 102
 103
 104 void _swrast_feedback_line( GLcontext *ctx, const SWvertex *v0, const SWvertex *v1 )
 105 {
 106    GLenum token = GL_LINE_TOKEN;
 107    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 108
 109    if (swrast->StippleCounter==0)
 110       token = GL_LINE_RESET_TOKEN;
 111
 112    FEEDBACK_TOKEN( ctx, (GLfloat) (GLint) token );
 113
 114    if (ctx->Light.ShadeModel == GL_SMOOTH) {
 115       feedback_vertex( ctx, v0, v0 );
 116       feedback_vertex( ctx, v1, v1 );
 117    } else {
 118       feedback_vertex( ctx, v0, v1 );
 119       feedback_vertex( ctx, v1, v1 );
 120    }
 121
 122    swrast->StippleCounter++;
 123 }
 124
 125
 126 void _swrast_feedback_point( GLcontext *ctx, const SWvertex *v )
 127 {
 128    FEEDBACK_TOKEN( ctx, (GLfloat) (GLint) GL_POINT_TOKEN );
 129    feedback_vertex( ctx, v, v );
 130 }
 131
 132
 133 void _swrast_select_triangle( GLcontext *ctx,
 134                          const SWvertex *v0,
 135                          const SWvertex *v1,
 136                          const SWvertex *v2)
 137 {
 138    if (_swrast_culltriangle( ctx, v0, v1, v2 )) {
 139       const GLfloat zs = 1.0F / ctx->DrawBuffer->_DepthMaxF;
 140
 141       _mesa_update_hitflag( ctx, v0->win[2] * zs );
 142       _mesa_update_hitflag( ctx, v1->win[2] * zs );
 143       _mesa_update_hitflag( ctx, v2->win[2] * zs );
 144    }
 145 }
 146
 147
 148 void _swrast_select_line( GLcontext *ctx, const SWvertex *v0, const SWvertex *v1 )
 149 {
 150    const GLfloat zs = 1.0F / ctx->DrawBuffer->_DepthMaxF;
 151    _mesa_update_hitflag( ctx, v0->win[2] * zs );
 152    _mesa_update_hitflag( ctx, v1->win[2] * zs );
 153 }
 154
 155
 156 void _swrast_select_point( GLcontext *ctx, const SWvertex *v )
 157 {
 158    const GLfloat zs = 1.0F / ctx->DrawBuffer->_DepthMaxF;
 159    _mesa_update_hitflag( ctx, v->win[2] * zs );
 160 }