src/mesa/swrast/s_feedback.c

   1 /*
   2  * Mesa 3-D graphics library
   3  *
   4  * Copyright (C) 1999-2007  Brian Paul   All Rights Reserved.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * copy of this software and associated documentation files (the "Software"),
   8  * to deal in the Software without restriction, including without limitation
   9  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  10  * and/or sell copies of the Software, and to permit persons to whom the
  11  * Software is furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included
  14  * in all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  17  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
  20  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  21  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  22  * OTHER DEALINGS IN THE SOFTWARE.
  23  */
  24
  25 #include "main/glheader.h"
  26 #include "main/feedback.h"
  27 #include "main/macros.h"
  28
  29 #include "s_context.h"
  30 #include "s_feedback.h"
  31 #include "s_triangle.h"
  32
  33
  34
  35 static void
  36 feedback_vertex(struct gl_context * ctx, const SWvertex * v, const SWvertex * pv)
  37 {
  38    GLfloat win[4];
  39    const GLfloat *vtc = v->attrib[VARYING_SLOT_TEX0];
  40    const GLfloat *color = v->attrib[VARYING_SLOT_COL0];
  41
  42    win[0] = v->attrib[VARYING_SLOT_POS][0];
  43    win[1] = v->attrib[VARYING_SLOT_POS][1];
  44    win[2] = v->attrib[VARYING_SLOT_POS][2] / ctx->DrawBuffer->_DepthMaxF;
  45    win[3] = 1.0F / v->attrib[VARYING_SLOT_POS][3];
  46
  47    _mesa_feedback_vertex(ctx, win, color, vtc);
  48 }
  49
  50
  51 /*
  52  * Put triangle in feedback buffer.
  53  */
  54 void
  55 _swrast_feedback_triangle(struct gl_context *ctx, const SWvertex *v0,
  56                           const SWvertex *v1, const SWvertex *v2)
  57 {
  58    if (!_swrast_culltriangle(ctx, v0, v1, v2)) {
  59       _mesa_feedback_token(ctx, (GLfloat) (GLint) GL_POLYGON_TOKEN);
  60       _mesa_feedback_token(ctx, (GLfloat) 3); /* three vertices */
  61
  62       if (ctx->Light.ShadeModel == GL_SMOOTH) {
  63          feedback_vertex(ctx, v0, v0);
  64          feedback_vertex(ctx, v1, v1);
  65          feedback_vertex(ctx, v2, v2);
  66       }
  67       else {
  68          feedback_vertex(ctx, v0, v2);
  69          feedback_vertex(ctx, v1, v2);
  70          feedback_vertex(ctx, v2, v2);
  71       }
  72    }
  73 }
  74
  75
  76 void
  77 _swrast_feedback_line(struct gl_context *ctx, const SWvertex *v0,
  78                       const SWvertex *v1)
  79 {
  80    GLenum token = GL_LINE_TOKEN;
  81    SWcontext *swrast = SWRAST_CONTEXT(ctx);
  82
  83    if (swrast->StippleCounter == 0)
  84       token = GL_LINE_RESET_TOKEN;
  85
  86    _mesa_feedback_token(ctx, (GLfloat) (GLint) token);
  87
  88    if (ctx->Light.ShadeModel == GL_SMOOTH) {
  89       feedback_vertex(ctx, v0, v0);
  90       feedback_vertex(ctx, v1, v1);
  91    }
  92    else {
  93       feedback_vertex(ctx, v0, v1);
  94       feedback_vertex(ctx, v1, v1);
  95    }
  96
  97    swrast->StippleCounter++;
  98 }
  99
 100
 101 void
 102 _swrast_feedback_point(struct gl_context *ctx, const SWvertex *v)
 103 {
 104    _mesa_feedback_token(ctx, (GLfloat) (GLint) GL_POINT_TOKEN);
 105    feedback_vertex(ctx, v, v);
 106 }
 107
 108
 109 void
 110 _swrast_select_triangle(struct gl_context *ctx, const SWvertex *v0,
 111                         const SWvertex *v1, const SWvertex *v2)
 112 {
 113    if (!_swrast_culltriangle(ctx, v0, v1, v2)) {
 114       const GLfloat zs = 1.0F / ctx->DrawBuffer->_DepthMaxF;
 115
 116       _mesa_update_hitflag( ctx, v0->attrib[VARYING_SLOT_POS][2] * zs );
 117       _mesa_update_hitflag( ctx, v1->attrib[VARYING_SLOT_POS][2] * zs );
 118       _mesa_update_hitflag( ctx, v2->attrib[VARYING_SLOT_POS][2] * zs );
 119    }
 120 }
 121
 122
 123 void
 124 _swrast_select_line(struct gl_context *ctx, const SWvertex *v0, const SWvertex *v1)
 125 {
 126    const GLfloat zs = 1.0F / ctx->DrawBuffer->_DepthMaxF;
 127    _mesa_update_hitflag( ctx, v0->attrib[VARYING_SLOT_POS][2] * zs );
 128    _mesa_update_hitflag( ctx, v1->attrib[VARYING_SLOT_POS][2] * zs );
 129 }
 130
 131
 132 void
 133 _swrast_select_point(struct gl_context *ctx, const SWvertex *v)
 134 {
 135    const GLfloat zs = 1.0F / ctx->DrawBuffer->_DepthMaxF;
 136    _mesa_update_hitflag( ctx, v->attrib[VARYING_SLOT_POS][2] * zs );
 137 }