dll/opengl/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 <precomp.h>
  26
  27 #include <main/feedback.h>
  28
  29 static void
  30 feedback_vertex(struct gl_context * ctx, const SWvertex * v, const SWvertex * pv)
  31 {
  32    GLfloat win[4];
  33    const GLfloat *vtc = v->attrib[FRAG_ATTRIB_TEX];
  34    const GLfloat *color = v->attrib[FRAG_ATTRIB_COL];
  35
  36    win[0] = v->attrib[FRAG_ATTRIB_WPOS][0];
  37    win[1] = v->attrib[FRAG_ATTRIB_WPOS][1];
  38    win[2] = v->attrib[FRAG_ATTRIB_WPOS][2] / ctx->DrawBuffer->_DepthMaxF;
  39    win[3] = 1.0F / v->attrib[FRAG_ATTRIB_WPOS][3];
  40
  41    _mesa_feedback_vertex(ctx, win, color, vtc);
  42 }
  43
  44
  45 /*
  46  * Put triangle in feedback buffer.
  47  */
  48 void
  49 _swrast_feedback_triangle(struct gl_context *ctx, const SWvertex *v0,
  50                           const SWvertex *v1, const SWvertex *v2)
  51 {
  52    if (!_swrast_culltriangle(ctx, v0, v1, v2)) {
  53       _mesa_feedback_token(ctx, (GLfloat) (GLint) GL_POLYGON_TOKEN);
  54       _mesa_feedback_token(ctx, (GLfloat) 3); /* three vertices */
  55
  56       if (ctx->Light.ShadeModel == GL_SMOOTH) {
  57          feedback_vertex(ctx, v0, v0);
  58          feedback_vertex(ctx, v1, v1);
  59          feedback_vertex(ctx, v2, v2);
  60       }
  61       else {
  62          feedback_vertex(ctx, v0, v2);
  63          feedback_vertex(ctx, v1, v2);
  64          feedback_vertex(ctx, v2, v2);
  65       }
  66    }
  67 }
  68
  69
  70 void
  71 _swrast_feedback_line(struct gl_context *ctx, const SWvertex *v0,
  72                       const SWvertex *v1)
  73 {
  74    GLenum token = GL_LINE_TOKEN;
  75    SWcontext *swrast = SWRAST_CONTEXT(ctx);
  76
  77    if (swrast->StippleCounter == 0)
  78       token = GL_LINE_RESET_TOKEN;
  79
  80    _mesa_feedback_token(ctx, (GLfloat) (GLint) token);
  81
  82    if (ctx->Light.ShadeModel == GL_SMOOTH) {
  83       feedback_vertex(ctx, v0, v0);
  84       feedback_vertex(ctx, v1, v1);
  85    }
  86    else {
  87       feedback_vertex(ctx, v0, v1);
  88       feedback_vertex(ctx, v1, v1);
  89    }
  90
  91    swrast->StippleCounter++;
  92 }
  93
  94
  95 void
  96 _swrast_feedback_point(struct gl_context *ctx, const SWvertex *v)
  97 {
  98    _mesa_feedback_token(ctx, (GLfloat) (GLint) GL_POINT_TOKEN);
  99    feedback_vertex(ctx, v, v);
 100 }
 101
 102
 103 void
 104 _swrast_select_triangle(struct gl_context *ctx, const SWvertex *v0,
 105                         const SWvertex *v1, const SWvertex *v2)
 106 {
 107    if (!_swrast_culltriangle(ctx, v0, v1, v2)) {
 108       const GLfloat zs = 1.0F / ctx->DrawBuffer->_DepthMaxF;
 109
 110       _mesa_update_hitflag( ctx, v0->attrib[FRAG_ATTRIB_WPOS][2] * zs );
 111       _mesa_update_hitflag( ctx, v1->attrib[FRAG_ATTRIB_WPOS][2] * zs );
 112       _mesa_update_hitflag( ctx, v2->attrib[FRAG_ATTRIB_WPOS][2] * zs );
 113    }
 114 }
 115
 116
 117 void
 118 _swrast_select_line(struct gl_context *ctx, const SWvertex *v0, const SWvertex *v1)
 119 {
 120    const GLfloat zs = 1.0F / ctx->DrawBuffer->_DepthMaxF;
 121    _mesa_update_hitflag( ctx, v0->attrib[FRAG_ATTRIB_WPOS][2] * zs );
 122    _mesa_update_hitflag( ctx, v1->attrib[FRAG_ATTRIB_WPOS][2] * zs );
 123 }
 124
 125
 126 void
 127 _swrast_select_point(struct gl_context *ctx, const SWvertex *v)
 128 {
 129    const GLfloat zs = 1.0F / ctx->DrawBuffer->_DepthMaxF;
 130    _mesa_update_hitflag( ctx, v->attrib[FRAG_ATTRIB_WPOS][2] * zs );
 131 }