src/mesa/swrast/s_feedback.c

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