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