src/mesa/swrast/s_feedback.c

   1 /* $Id: s_feedback.c,v 1.5 2001/01/23 23:39:37 brianp Exp $ */
   2
   3 /*
   4  * Mesa 3-D graphics library
   5  * Version:  3.5
   6  *
   7  * Copyright (C) 1999-2001  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 #include "mmath.h"
  34
  35 #include "s_context.h"
  36 #include "s_feedback.h"
  37 #include "s_triangle.h"
  38
  39
  40 #define FB_3D           0x01
  41 #define FB_4D           0x02
  42 #define FB_INDEX        0x04
  43 #define FB_COLOR        0x08
  44 #define FB_TEXTURE      0X10
  45
  46
  47
  48
  49 static void feedback_vertex( GLcontext *ctx,
  50                              const SWvertex *v, const SWvertex *pv )
  51 {
  52    GLfloat win[4];
  53    GLfloat color[4];
  54    GLfloat tc[4];
  55    GLuint texUnit = ctx->Texture.CurrentTransformUnit;
  56    GLuint index;
  57
  58    win[0] = v->win[0];
  59    win[1] = v->win[1];
  60    win[2] = v->win[2] / ctx->DepthMaxF;
  61    win[3] = 1.0 / v->win[3];
  62
  63    color[0] = CHAN_TO_FLOAT(pv->color[0]);
  64    color[1] = CHAN_TO_FLOAT(pv->color[1]);
  65    color[2] = CHAN_TO_FLOAT(pv->color[2]);
  66    color[3] = CHAN_TO_FLOAT(pv->color[3]);
  67
  68    if (v->texcoord[texUnit][3] != 1.0 &&
  69        v->texcoord[texUnit][3] != 0.0) {
  70       GLfloat invq = 1.0F / v->texcoord[texUnit][3];
  71       tc[0] = v->texcoord[texUnit][0] * invq;
  72       tc[1] = v->texcoord[texUnit][1] * invq;
  73       tc[2] = v->texcoord[texUnit][2] * invq;
  74       tc[3] = v->texcoord[texUnit][3];
  75    }
  76    else {
  77       COPY_4V(tc, v->texcoord[texUnit]);
  78    }
  79
  80    index = v->index;
  81
  82    gl_feedback_vertex( ctx, win, color, index, tc );
  83 }
  84
  85
  86 /*
  87  * Put triangle in feedback buffer.
  88  */
  89 void gl_feedback_triangle( GLcontext *ctx,
  90                            const SWvertex *v0,
  91                            const SWvertex *v1,
  92                            const SWvertex *v2)
  93 {
  94    if (gl_cull_triangle( ctx, v0, v1, v2 )) {
  95       FEEDBACK_TOKEN( ctx, (GLfloat) (GLint) GL_POLYGON_TOKEN );
  96       FEEDBACK_TOKEN( ctx, (GLfloat) 3 );        /* three vertices */
  97
  98       if (ctx->Light.ShadeModel == GL_SMOOTH) {
  99          feedback_vertex( ctx, v0, v0 );
 100          feedback_vertex( ctx, v1, v1 );
 101          feedback_vertex( ctx, v2, v2 );
 102       } else {
 103          feedback_vertex( ctx, v0, v2 );
 104          feedback_vertex( ctx, v1, v2 );
 105          feedback_vertex( ctx, v2, v2 );
 106       }
 107    }
 108 }
 109
 110
 111 void gl_feedback_line( GLcontext *ctx, const SWvertex *v0, const SWvertex *v1 )
 112 {
 113    GLenum token = GL_LINE_TOKEN;
 114    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 115
 116    if (swrast->StippleCounter==0)
 117       token = GL_LINE_RESET_TOKEN;
 118
 119    FEEDBACK_TOKEN( ctx, (GLfloat) (GLint) token );
 120
 121    if (ctx->Light.ShadeModel == GL_SMOOTH) {
 122       feedback_vertex( ctx, v0, v0 );
 123       feedback_vertex( ctx, v1, v1 );
 124    } else {
 125       feedback_vertex( ctx, v0, v1 );
 126       feedback_vertex( ctx, v1, v1 );
 127    }
 128
 129    swrast->StippleCounter++;
 130 }
 131
 132
 133 void gl_feedback_point( GLcontext *ctx, const SWvertex *v )
 134 {
 135    FEEDBACK_TOKEN( ctx, (GLfloat) (GLint) GL_POINT_TOKEN );
 136    feedback_vertex( ctx, v, v );
 137 }
 138
 139
 140 void gl_select_triangle( GLcontext *ctx,
 141                          const SWvertex *v0,
 142                          const SWvertex *v1,
 143                          const SWvertex *v2)
 144 {
 145    if (gl_cull_triangle( ctx, v0, v1, v2 )) {
 146       const GLfloat zs = 1.0F / ctx->DepthMaxF;
 147
 148       gl_update_hitflag( ctx, v0->win[2] * zs );
 149       gl_update_hitflag( ctx, v1->win[2] * zs );
 150       gl_update_hitflag( ctx, v2->win[2] * zs );
 151    }
 152 }
 153
 154
 155 void gl_select_line( GLcontext *ctx, const SWvertex *v0, const SWvertex *v1 )
 156 {
 157    const GLfloat zs = 1.0F / ctx->DepthMaxF;
 158    gl_update_hitflag( ctx, v0->win[2] * zs );
 159    gl_update_hitflag( ctx, v1->win[2] * zs );
 160 }
 161
 162
 163 void gl_select_point( GLcontext *ctx, const SWvertex *v )
 164 {
 165    const GLfloat zs = 1.0F / ctx->DepthMaxF;
 166    gl_update_hitflag( ctx, v->win[2] * zs );
 167 }
 168
 169
 170