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/feedback.h"
  29 #include "main/macros.h"
  30
  31 #include "s_context.h"
  32 #include "s_feedback.h"
  33 #include "s_triangle.h"
  34
  35
  36
  37 static void
  38 feedback_vertex(GLcontext * ctx, const SWvertex * v, const SWvertex * pv)
  39 {
  40    GLfloat win[4];
  41    const GLfloat *vtc = v->attrib[FRAG_ATTRIB_TEX0];
  42    const GLfloat *color = v->attrib[FRAG_ATTRIB_COL0];
  43
  44    win[0] = v->attrib[FRAG_ATTRIB_WPOS][0];
  45    win[1] = v->attrib[FRAG_ATTRIB_WPOS][1];
  46    win[2] = v->attrib[FRAG_ATTRIB_WPOS][2] / ctx->DrawBuffer->_DepthMaxF;
  47    win[3] = 1.0F / v->attrib[FRAG_ATTRIB_WPOS][3];
  48
  49    _mesa_feedback_vertex(ctx, win, color, vtc);
  50 }
  51
  52
  53 /*
  54  * Put triangle in feedback buffer.
  55  */
  56 void
  57 _swrast_feedback_triangle(GLcontext *ctx, const SWvertex *v0,
  58                           const SWvertex *v1, const SWvertex *v2)
  59 {
  60    if (!_swrast_culltriangle(ctx, v0, v1, v2)) {
  61       _mesa_feedback_token(ctx, (GLfloat) (GLint) GL_POLYGON_TOKEN);
  62       _mesa_feedback_token(ctx, (GLfloat) 3); /* three vertices */
  63
  64       if (ctx->Light.ShadeModel == GL_SMOOTH) {
  65          feedback_vertex(ctx, v0, v0);
  66          feedback_vertex(ctx, v1, v1);
  67          feedback_vertex(ctx, v2, v2);
  68       }
  69       else {
  70          feedback_vertex(ctx, v0, v2);
  71          feedback_vertex(ctx, v1, v2);
  72          feedback_vertex(ctx, v2, v2);
  73       }
  74    }
  75 }
  76
  77
  78 void
  79 _swrast_feedback_line(GLcontext *ctx, const SWvertex *v0,
  80                       const SWvertex *v1)
  81 {
  82    GLenum token = GL_LINE_TOKEN;
  83    SWcontext *swrast = SWRAST_CONTEXT(ctx);
  84
  85    if (swrast->StippleCounter == 0)
  86       token = GL_LINE_RESET_TOKEN;
  87
  88    _mesa_feedback_token(ctx, (GLfloat) (GLint) token);
  89
  90    if (ctx->Light.ShadeModel == GL_SMOOTH) {
  91       feedback_vertex(ctx, v0, v0);
  92       feedback_vertex(ctx, v1, v1);
  93    }
  94    else {
  95       feedback_vertex(ctx, v0, v1);
  96       feedback_vertex(ctx, v1, v1);
  97    }
  98
  99    swrast->StippleCounter++;
 100 }
 101
 102
 103 void
 104 _swrast_feedback_point(GLcontext *ctx, const SWvertex *v)
 105 {
 106    _mesa_feedback_token(ctx, (GLfloat) (GLint) GL_POINT_TOKEN);
 107    feedback_vertex(ctx, v, v);
 108 }
 109
 110
 111 void
 112 _swrast_select_triangle(GLcontext *ctx, const SWvertex *v0,
 113                         const SWvertex *v1, const SWvertex *v2)
 114 {
 115    if (!_swrast_culltriangle(ctx, v0, v1, v2)) {
 116       const GLfloat zs = 1.0F / ctx->DrawBuffer->_DepthMaxF;
 117
 118       _mesa_update_hitflag( ctx, v0->attrib[FRAG_ATTRIB_WPOS][2] * zs );
 119       _mesa_update_hitflag( ctx, v1->attrib[FRAG_ATTRIB_WPOS][2] * zs );
 120       _mesa_update_hitflag( ctx, v2->attrib[FRAG_ATTRIB_WPOS][2] * zs );
 121    }
 122 }
 123
 124
 125 void
 126 _swrast_select_line(GLcontext *ctx, const SWvertex *v0, const SWvertex *v1)
 127 {
 128    const GLfloat zs = 1.0F / ctx->DrawBuffer->_DepthMaxF;
 129    _mesa_update_hitflag( ctx, v0->attrib[FRAG_ATTRIB_WPOS][2] * zs );
 130    _mesa_update_hitflag( ctx, v1->attrib[FRAG_ATTRIB_WPOS][2] * zs );
 131 }
 132
 133
 134 void
 135 _swrast_select_point(GLcontext *ctx, const SWvertex *v)
 136 {
 137    const GLfloat zs = 1.0F / ctx->DrawBuffer->_DepthMaxF;
 138    _mesa_update_hitflag( ctx, v->attrib[FRAG_ATTRIB_WPOS][2] * zs );
 139 }