src/mesa/swrast/s_feedback.c

   1 /* $Id: s_feedback.c,v 1.1 2000/11/05 18:24:40 keithw Exp $ */
   2
   3 /*
   4  * Mesa 3-D graphics library
   5  * Version:  3.3
   6  *
   7  * Copyright (C) 1999-2000  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, SWvertex *v )
  50 {
  51    GLfloat win[4];
  52    GLfloat color[4];
  53    GLfloat tc[4];
  54    GLuint texUnit = ctx->Texture.CurrentTransformUnit;
  55    GLuint index;
  56
  57    win[0] = v->win[0];
  58    win[1] = v->win[1];
  59    win[2] = v->win[2] / ctx->Visual.DepthMaxF;
  60    win[3] = 1.0 / v->win[3];
  61
  62    color[0] = CHAN_TO_FLOAT(v->color[0]);
  63    color[1] = CHAN_TO_FLOAT(v->color[1]);
  64    color[2] = CHAN_TO_FLOAT(v->color[2]);
  65    color[3] = CHAN_TO_FLOAT(v->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    gl_feedback_vertex( ctx, win, color, index, tc );
  82 }
  83
  84
  85 /*
  86  * Put triangle in feedback buffer.
  87  */
  88 void gl_feedback_triangle( GLcontext *ctx, SWvertex *v0, SWvertex *v1,
  89                            SWvertex *v2)
  90 {
  91    if (gl_cull_triangle( ctx, v0, v1, v2 )) {
  92       FEEDBACK_TOKEN( ctx, (GLfloat) (GLint) GL_POLYGON_TOKEN );
  93       FEEDBACK_TOKEN( ctx, (GLfloat) 3 );        /* three vertices */
  94
  95       feedback_vertex( ctx, v0 );
  96       feedback_vertex( ctx, v1 );
  97       feedback_vertex( ctx, v2 );
  98    }
  99 }
 100
 101
 102 void gl_feedback_line( GLcontext *ctx, SWvertex *v0, SWvertex *v1 )
 103 {
 104    GLenum token = GL_LINE_TOKEN;
 105    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 106
 107    if (swrast->StippleCounter==0)
 108       token = GL_LINE_RESET_TOKEN;
 109
 110    FEEDBACK_TOKEN( ctx, (GLfloat) (GLint) token );
 111
 112    feedback_vertex( ctx, v0 );
 113    feedback_vertex( ctx, v1 );
 114
 115    swrast->StippleCounter++;
 116 }
 117
 118
 119 void gl_feedback_point( GLcontext *ctx, SWvertex *v )
 120 {
 121    FEEDBACK_TOKEN( ctx, (GLfloat) (GLint) GL_POINT_TOKEN );
 122    feedback_vertex( ctx, v );
 123 }
 124
 125
 126 void gl_select_triangle( GLcontext *ctx, SWvertex *v0, SWvertex *v1,
 127                          SWvertex *v2)
 128 {
 129    if (gl_cull_triangle( ctx, v0, v1, v2 )) {
 130       const GLfloat zs = 1.0F / ctx->Visual.DepthMaxF;
 131       gl_update_hitflag( ctx, v0->win[2] * zs );
 132       gl_update_hitflag( ctx, v1->win[2] * zs );
 133       gl_update_hitflag( ctx, v2->win[2] * zs );
 134    }
 135 }
 136
 137
 138 void gl_select_line( GLcontext *ctx, SWvertex *v0, SWvertex *v1 )
 139 {
 140    const GLfloat zs = 1.0F / ctx->Visual.DepthMaxF;
 141    gl_update_hitflag( ctx, v0->win[2] * zs );
 142    gl_update_hitflag( ctx, v1->win[2] * zs );
 143 }
 144
 145
 146 void gl_select_point( GLcontext *ctx, SWvertex *v )
 147 {
 148    const GLfloat zs = 1.0F / ctx->Visual.DepthMaxF;
 149    gl_update_hitflag( ctx, v->win[2] * zs );
 150 }
 151
 152
 153