src/mesa/swrast/s_feedback.c

   1 /* $Id: s_feedback.c,v 1.11 2003/03/25 02:23:46 brianp Exp $ */
   2
   3 /*
   4  * Mesa 3-D graphics library
   5  * Version:  5.1
   6  *
   7  * Copyright (C) 1999-2003  Brian Paul   All Rights Reserved.
   8  *
   9  * Permission is hereby granted, free of charge, to any person obtaining a
  10  * copy of this software and associated documentation files (the "Software"),
  11  * to deal in the Software without restriction, including without limitation
  12  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  13  * and/or sell copies of the Software, and to permit persons to whom the
  14  * Software is furnished to do so, subject to the following conditions:
  15  *
  16  * The above copyright notice and this permission notice shall be included
  17  * in all copies or substantial portions of the Software.
  18  *
  19  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  20  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  21  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  22  * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  23  * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  24  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25  */
  26
  27 #include "glheader.h"
  28 #include "colormac.h"
  29 #include "context.h"
  30 #include "enums.h"
  31 #include "feedback.h"
  32 #include "macros.h"
  33
  34 #include "s_context.h"
  35 #include "s_feedback.h"
  36 #include "s_triangle.h"
  37
  38
  39 #define FB_3D           0x01
  40 #define FB_4D           0x02
  41 #define FB_INDEX        0x04
  42 #define FB_COLOR        0x08
  43 #define FB_TEXTURE      0X10
  44
  45
  46
  47
  48 static void feedback_vertex( GLcontext *ctx,
  49                              const SWvertex *v, const SWvertex *pv )
  50 {
  51    const GLuint texUnit = 0;  /* See section 5.3 of 1.2.1 spec */
  52    GLfloat win[4];
  53    GLfloat color[4];
  54    GLfloat tc[4];
  55    GLuint index;
  56
  57    win[0] = v->win[0];
  58    win[1] = v->win[1];
  59    win[2] = v->win[2] / ctx->DepthMaxF;
  60    win[3] = 1.0F / v->win[3];
  61
  62    color[0] = CHAN_TO_FLOAT(pv->color[0]);
  63    color[1] = CHAN_TO_FLOAT(pv->color[1]);
  64    color[2] = CHAN_TO_FLOAT(pv->color[2]);
  65    color[3] = CHAN_TO_FLOAT(pv->color[3]);
  66
  67    if (v->texcoord[texUnit][3] != 1.0 &&
  68        v->texcoord[texUnit][3] != 0.0) {
  69       GLfloat invq = 1.0F / v->texcoord[texUnit][3];
  70       tc[0] = v->texcoord[texUnit][0] * invq;
  71       tc[1] = v->texcoord[texUnit][1] * invq;
  72       tc[2] = v->texcoord[texUnit][2] * invq;
  73       tc[3] = v->texcoord[texUnit][3];
  74    }
  75    else {
  76       COPY_4V(tc, v->texcoord[texUnit]);
  77    }
  78
  79    index = v->index;
  80
  81    _mesa_feedback_vertex( ctx, win, color, index, tc );
  82 }
  83
  84
  85 /*
  86  * Put triangle in feedback buffer.
  87  */
  88 void _swrast_feedback_triangle( GLcontext *ctx,
  89                            const SWvertex *v0,
  90                            const SWvertex *v1,
  91                            const SWvertex *v2)
  92 {
  93    if (_swrast_culltriangle( ctx, v0, v1, v2 )) {
  94       FEEDBACK_TOKEN( ctx, (GLfloat) (GLint) GL_POLYGON_TOKEN );
  95       FEEDBACK_TOKEN( ctx, (GLfloat) 3 );        /* three vertices */
  96
  97       if (ctx->Light.ShadeModel == GL_SMOOTH) {
  98          feedback_vertex( ctx, v0, v0 );
  99          feedback_vertex( ctx, v1, v1 );
 100          feedback_vertex( ctx, v2, v2 );
 101       } else {
 102          feedback_vertex( ctx, v0, v2 );
 103          feedback_vertex( ctx, v1, v2 );
 104          feedback_vertex( ctx, v2, v2 );
 105       }
 106    }
 107 }
 108
 109
 110 void _swrast_feedback_line( GLcontext *ctx, const SWvertex *v0, const SWvertex *v1 )
 111 {
 112    GLenum token = GL_LINE_TOKEN;
 113    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 114
 115    if (swrast->StippleCounter==0)
 116       token = GL_LINE_RESET_TOKEN;
 117
 118    FEEDBACK_TOKEN( ctx, (GLfloat) (GLint) token );
 119
 120    if (ctx->Light.ShadeModel == GL_SMOOTH) {
 121       feedback_vertex( ctx, v0, v0 );
 122       feedback_vertex( ctx, v1, v1 );
 123    } else {
 124       feedback_vertex( ctx, v0, v1 );
 125       feedback_vertex( ctx, v1, v1 );
 126    }
 127
 128    swrast->StippleCounter++;
 129 }
 130
 131
 132 void _swrast_feedback_point( GLcontext *ctx, const SWvertex *v )
 133 {
 134    FEEDBACK_TOKEN( ctx, (GLfloat) (GLint) GL_POINT_TOKEN );
 135    feedback_vertex( ctx, v, v );
 136 }
 137
 138
 139 void _swrast_select_triangle( GLcontext *ctx,
 140                          const SWvertex *v0,
 141                          const SWvertex *v1,
 142                          const SWvertex *v2)
 143 {
 144    if (_swrast_culltriangle( ctx, v0, v1, v2 )) {
 145       const GLfloat zs = 1.0F / ctx->DepthMaxF;
 146
 147       _mesa_update_hitflag( ctx, v0->win[2] * zs );
 148       _mesa_update_hitflag( ctx, v1->win[2] * zs );
 149       _mesa_update_hitflag( ctx, v2->win[2] * zs );
 150    }
 151 }
 152
 153
 154 void _swrast_select_line( GLcontext *ctx, const SWvertex *v0, const SWvertex *v1 )
 155 {
 156    const GLfloat zs = 1.0F / ctx->DepthMaxF;
 157    _mesa_update_hitflag( ctx, v0->win[2] * zs );
 158    _mesa_update_hitflag( ctx, v1->win[2] * zs );
 159 }
 160
 161
 162 void _swrast_select_point( GLcontext *ctx, const SWvertex *v )
 163 {
 164    const GLfloat zs = 1.0F / ctx->DepthMaxF;
 165    _mesa_update_hitflag( ctx, v->win[2] * zs );
 166 }