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
  55    win[0] = v->win[0];
  56    win[1] = v->win[1];
  57    win[2] = v->win[2] / ctx->DepthMaxF;
  58    win[3] = 1.0F / v->win[3];
  59
  60    color[0] = CHAN_TO_FLOAT(pv->color[0]);
  61    color[1] = CHAN_TO_FLOAT(pv->color[1]);
  62    color[2] = CHAN_TO_FLOAT(pv->color[2]);
  63    color[3] = CHAN_TO_FLOAT(pv->color[3]);
  64
  65    if (v->texcoord[texUnit][3] != 1.0 &&
  66        v->texcoord[texUnit][3] != 0.0) {
  67       GLfloat invq = 1.0F / v->texcoord[texUnit][3];
  68       tc[0] = v->texcoord[texUnit][0] * invq;
  69       tc[1] = v->texcoord[texUnit][1] * invq;
  70       tc[2] = v->texcoord[texUnit][2] * invq;
  71       tc[3] = v->texcoord[texUnit][3];
  72    }
  73    else {
  74       COPY_4V(tc, v->texcoord[texUnit]);
  75    }
  76
  77    _mesa_feedback_vertex( ctx, win, color, (GLfloat) v->index, tc );
  78 }
  79
  80
  81 /*
  82  * Put triangle in feedback buffer.
  83  */
  84 void _swrast_feedback_triangle( GLcontext *ctx,
  85                            const SWvertex *v0,
  86                            const SWvertex *v1,
  87                            const SWvertex *v2)
  88 {
  89    if (_swrast_culltriangle( ctx, v0, v1, v2 )) {
  90       FEEDBACK_TOKEN( ctx, (GLfloat) (GLint) GL_POLYGON_TOKEN );
  91       FEEDBACK_TOKEN( ctx, (GLfloat) 3 );        /* three vertices */
  92
  93       if (ctx->Light.ShadeModel == GL_SMOOTH) {
  94          feedback_vertex( ctx, v0, v0 );
  95          feedback_vertex( ctx, v1, v1 );
  96          feedback_vertex( ctx, v2, v2 );
  97       } else {
  98          feedback_vertex( ctx, v0, v2 );
  99          feedback_vertex( ctx, v1, v2 );
 100          feedback_vertex( ctx, v2, v2 );
 101       }
 102    }
 103 }
 104
 105
 106 void _swrast_feedback_line( GLcontext *ctx, const SWvertex *v0, const SWvertex *v1 )
 107 {
 108    GLenum token = GL_LINE_TOKEN;
 109    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 110
 111    if (swrast->StippleCounter==0)
 112       token = GL_LINE_RESET_TOKEN;
 113
 114    FEEDBACK_TOKEN( ctx, (GLfloat) (GLint) token );
 115
 116    if (ctx->Light.ShadeModel == GL_SMOOTH) {
 117       feedback_vertex( ctx, v0, v0 );
 118       feedback_vertex( ctx, v1, v1 );
 119    } else {
 120       feedback_vertex( ctx, v0, v1 );
 121       feedback_vertex( ctx, v1, v1 );
 122    }
 123
 124    swrast->StippleCounter++;
 125 }
 126
 127
 128 void _swrast_feedback_point( GLcontext *ctx, const SWvertex *v )
 129 {
 130    FEEDBACK_TOKEN( ctx, (GLfloat) (GLint) GL_POINT_TOKEN );
 131    feedback_vertex( ctx, v, v );
 132 }
 133
 134
 135 void _swrast_select_triangle( GLcontext *ctx,
 136                          const SWvertex *v0,
 137                          const SWvertex *v1,
 138                          const SWvertex *v2)
 139 {
 140    if (_swrast_culltriangle( ctx, v0, v1, v2 )) {
 141       const GLfloat zs = 1.0F / ctx->DepthMaxF;
 142
 143       _mesa_update_hitflag( ctx, v0->win[2] * zs );
 144       _mesa_update_hitflag( ctx, v1->win[2] * zs );
 145       _mesa_update_hitflag( ctx, v2->win[2] * zs );
 146    }
 147 }
 148
 149
 150 void _swrast_select_line( GLcontext *ctx, const SWvertex *v0, const SWvertex *v1 )
 151 {
 152    const GLfloat zs = 1.0F / ctx->DepthMaxF;
 153    _mesa_update_hitflag( ctx, v0->win[2] * zs );
 154    _mesa_update_hitflag( ctx, v1->win[2] * zs );
 155 }
 156
 157
 158 void _swrast_select_point( GLcontext *ctx, const SWvertex *v )
 159 {
 160    const GLfloat zs = 1.0F / ctx->DepthMaxF;
 161    _mesa_update_hitflag( ctx, v->win[2] * zs );
 162 }