s_feedback.c revision 4a49301e 
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
37static void
38feedback_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, v->attrib[FRAG_ATTRIB_CI][0], vtc);
50}
51
52
53/*
54 * Put triangle in feedback buffer.
55 */
56void
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
78void
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
103void
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
111void
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
125void
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
134void
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}
140