src/mesa/swrast/s_feedback.c

   1 /*
   2  * Mesa 3-D graphics library
   3  * Version:  7.0
   4  *
   5  * Copyright (C) 1999-2007  Brian Paul   All Rights Reserved.
   6  *
   7  * Permission is hereby granted, free of charge, to any person obtaining a
   8  * copy of this software and associated documentation files (the "Software"),
   9  * to deal in the Software without restriction, including without limitation
  10  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  11  * and/or sell copies of the Software, and to permit persons to whom the
  12  * Software is furnished to do so, subject to the following conditions:
  13  *
  14  * The above copyright notice and this permission notice shall be included
  15  * in all copies or substantial portions of the Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  18  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  20  * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  21  * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  22  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  23  */
  24
  25 #include "main/glheader.h"
  26 #include "main/colormac.h"
  27 #include "main/context.h"
  28 #include "main/enums.h"
  29 #include "main/feedback.h"
  30 #include "main/macros.h"
  31
  32 #include "s_context.h"
  33 #include "s_feedback.h"
  34 #include "s_triangle.h"
  35
  36
  37
  38 static void
  39 feedback_vertex(GLcontext * ctx, const SWvertex * v, const SWvertex * pv)
  40 {
  41    GLfloat win[4];
  42    const GLfloat *vtc = v->attrib[FRAG_ATTRIB_TEX0];
  43    const GLfloat *color = v->attrib[FRAG_ATTRIB_COL0];
  44
  45    win[0] = v->attrib[FRAG_ATTRIB_WPOS][0];
  46    win[1] = v->attrib[FRAG_ATTRIB_WPOS][1];
  47    win[2] = v->attrib[FRAG_ATTRIB_WPOS][2] / ctx->DrawBuffer->_DepthMaxF;
  48    win[3] = 1.0F / v->attrib[FRAG_ATTRIB_WPOS][3];
  49
  50    _mesa_feedback_vertex(ctx, win, color, v->attrib[FRAG_ATTRIB_CI][0], vtc);
  51 }
  52
  53
  54 /*
  55  * Put triangle in feedback buffer.
  56  */
  57 void
  58 _swrast_feedback_triangle(GLcontext *ctx, const SWvertex *v0,
  59                           const SWvertex *v1, const SWvertex *v2)
  60 {
  61    if (_swrast_culltriangle(ctx, v0, v1, v2)) {
  62       _mesa_feedback_token(ctx, (GLfloat) (GLint) GL_POLYGON_TOKEN);
  63       _mesa_feedback_token(ctx, (GLfloat) 3); /* three vertices */
  64
  65       if (ctx->Light.ShadeModel == GL_SMOOTH) {
  66          feedback_vertex(ctx, v0, v0);
  67          feedback_vertex(ctx, v1, v1);
  68          feedback_vertex(ctx, v2, v2);
  69       }
  70       else {
  71          feedback_vertex(ctx, v0, v2);
  72          feedback_vertex(ctx, v1, v2);
  73          feedback_vertex(ctx, v2, v2);
  74       }
  75    }
  76 }
  77
  78
  79 void
  80 _swrast_feedback_line(GLcontext *ctx, const SWvertex *v0,
  81                       const SWvertex *v1)
  82 {
  83    GLenum token = GL_LINE_TOKEN;
  84    SWcontext *swrast = SWRAST_CONTEXT(ctx);
  85
  86    if (swrast->StippleCounter == 0)
  87       token = GL_LINE_RESET_TOKEN;
  88
  89    _mesa_feedback_token(ctx, (GLfloat) (GLint) token);
  90
  91    if (ctx->Light.ShadeModel == GL_SMOOTH) {
  92       feedback_vertex(ctx, v0, v0);
  93       feedback_vertex(ctx, v1, v1);
  94    }
  95    else {
  96       feedback_vertex(ctx, v0, v1);
  97       feedback_vertex(ctx, v1, v1);
  98    }
  99
 100    swrast->StippleCounter++;
 101 }
 102
 103
 104 void
 105 _swrast_feedback_point(GLcontext *ctx, const SWvertex *v)
 106 {
 107    _mesa_feedback_token(ctx, (GLfloat) (GLint) GL_POINT_TOKEN);
 108    feedback_vertex(ctx, v, v);
 109 }
 110
 111
 112 void
 113 _swrast_select_triangle(GLcontext *ctx, const SWvertex *v0,
 114                         const SWvertex *v1, const SWvertex *v2)
 115 {
 116    if (_swrast_culltriangle(ctx, v0, v1, v2)) {
 117       const GLfloat zs = 1.0F / ctx->DrawBuffer->_DepthMaxF;
 118
 119       _mesa_update_hitflag( ctx, v0->attrib[FRAG_ATTRIB_WPOS][2] * zs );
 120       _mesa_update_hitflag( ctx, v1->attrib[FRAG_ATTRIB_WPOS][2] * zs );
 121       _mesa_update_hitflag( ctx, v2->attrib[FRAG_ATTRIB_WPOS][2] * zs );
 122    }
 123 }
 124
 125
 126 void
 127 _swrast_select_line(GLcontext *ctx, const SWvertex *v0, const SWvertex *v1)
 128 {
 129    const GLfloat zs = 1.0F / ctx->DrawBuffer->_DepthMaxF;
 130    _mesa_update_hitflag( ctx, v0->attrib[FRAG_ATTRIB_WPOS][2] * zs );
 131    _mesa_update_hitflag( ctx, v1->attrib[FRAG_ATTRIB_WPOS][2] * zs );
 132 }
 133
 134
 135 void
 136 _swrast_select_point(GLcontext *ctx, const SWvertex *v)
 137 {
 138    const GLfloat zs = 1.0F / ctx->DrawBuffer->_DepthMaxF;
 139    _mesa_update_hitflag( ctx, v->attrib[FRAG_ATTRIB_WPOS][2] * zs );
 140 }