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
feedback_vertex(struct gl_context * ctx,const SWvertex * v,const SWvertex * pv)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_TEX0];
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
_swrast_feedback_triangle(struct gl_context * ctx,const SWvertex * v0,const SWvertex * v1,const SWvertex * v2)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
_swrast_feedback_line(struct gl_context * ctx,const SWvertex * v0,const SWvertex * v1)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
_swrast_feedback_point(struct gl_context * ctx,const SWvertex * v)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
_swrast_select_triangle(struct gl_context * ctx,const SWvertex * v0,const SWvertex * v1,const SWvertex * v2)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
_swrast_select_line(struct gl_context * ctx,const SWvertex * v0,const SWvertex * v1)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
_swrast_select_point(struct gl_context * ctx,const SWvertex * v)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 }
139