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 "glheader.h"
  26 #include "colormac.h"
  27 #include "context.h"
  28 #include "enums.h"
  29 #include "feedback.h"
  30 #include "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    GLfloat color[4];
  43    const GLfloat *vtc = v->attrib[FRAG_ATTRIB_TEX0];
  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    color[0] = CHAN_TO_FLOAT(pv->color[0]);
  51    color[1] = CHAN_TO_FLOAT(pv->color[1]);
  52    color[2] = CHAN_TO_FLOAT(pv->color[2]);
  53    color[3] = CHAN_TO_FLOAT(pv->color[3]);
  54
  55    _mesa_feedback_vertex(ctx, win, color, v->attrib[FRAG_ATTRIB_CI][0], vtc);
  56 }
  57
  58
  59 /*
  60  * Put triangle in feedback buffer.
  61  */
  62 void
  63 _swrast_feedback_triangle(GLcontext *ctx, const SWvertex *v0,
  64                           const SWvertex *v1, const SWvertex *v2)
  65 {
  66    if (_swrast_culltriangle(ctx, v0, v1, v2)) {
  67       FEEDBACK_TOKEN(ctx, (GLfloat) (GLint) GL_POLYGON_TOKEN);
  68       FEEDBACK_TOKEN(ctx, (GLfloat) 3); /* three vertices */
  69
  70       if (ctx->Light.ShadeModel == GL_SMOOTH) {
  71          feedback_vertex(ctx, v0, v0);
  72          feedback_vertex(ctx, v1, v1);
  73          feedback_vertex(ctx, v2, v2);
  74       }
  75       else {
  76          feedback_vertex(ctx, v0, v2);
  77          feedback_vertex(ctx, v1, v2);
  78          feedback_vertex(ctx, v2, v2);
  79       }
  80    }
  81 }
  82
  83
  84 void
  85 _swrast_feedback_line(GLcontext *ctx, const SWvertex *v0,
  86                       const SWvertex *v1)
  87 {
  88    GLenum token = GL_LINE_TOKEN;
  89    SWcontext *swrast = SWRAST_CONTEXT(ctx);
  90
  91    if (swrast->StippleCounter == 0)
  92       token = GL_LINE_RESET_TOKEN;
  93
  94    FEEDBACK_TOKEN(ctx, (GLfloat) (GLint) token);
  95
  96    if (ctx->Light.ShadeModel == GL_SMOOTH) {
  97       feedback_vertex(ctx, v0, v0);
  98       feedback_vertex(ctx, v1, v1);
  99    }
 100    else {
 101       feedback_vertex(ctx, v0, v1);
 102       feedback_vertex(ctx, v1, v1);
 103    }
 104
 105    swrast->StippleCounter++;
 106 }
 107
 108
 109 void
 110 _swrast_feedback_point(GLcontext *ctx, const SWvertex *v)
 111 {
 112    FEEDBACK_TOKEN(ctx, (GLfloat) (GLint) GL_POINT_TOKEN);
 113    feedback_vertex(ctx, v, v);
 114 }
 115
 116
 117 void
 118 _swrast_select_triangle(GLcontext *ctx, const SWvertex *v0,
 119                         const SWvertex *v1, const SWvertex *v2)
 120 {
 121    if (_swrast_culltriangle(ctx, v0, v1, v2)) {
 122       const GLfloat zs = 1.0F / ctx->DrawBuffer->_DepthMaxF;
 123
 124       _mesa_update_hitflag( ctx, v0->attrib[FRAG_ATTRIB_WPOS][2] * zs );
 125       _mesa_update_hitflag( ctx, v1->attrib[FRAG_ATTRIB_WPOS][2] * zs );
 126       _mesa_update_hitflag( ctx, v2->attrib[FRAG_ATTRIB_WPOS][2] * zs );
 127    }
 128 }
 129
 130
 131 void
 132 _swrast_select_line(GLcontext *ctx, const SWvertex *v0, const SWvertex *v1)
 133 {
 134    const GLfloat zs = 1.0F / ctx->DrawBuffer->_DepthMaxF;
 135    _mesa_update_hitflag( ctx, v0->attrib[FRAG_ATTRIB_WPOS][2] * zs );
 136    _mesa_update_hitflag( ctx, v1->attrib[FRAG_ATTRIB_WPOS][2] * zs );
 137 }
 138
 139
 140 void
 141 _swrast_select_point(GLcontext *ctx, const SWvertex *v)
 142 {
 143    const GLfloat zs = 1.0F / ctx->DrawBuffer->_DepthMaxF;
 144    _mesa_update_hitflag( ctx, v->attrib[FRAG_ATTRIB_WPOS][2] * zs );
 145 }