1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
|
/*
* Mesa 3-D graphics library
* Version: 6.1
*
* Copyright (C) 1999-2004 Brian Paul All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
* AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*
* Authors:
* Keith Whitwell <keith@tungstengraphics.com>
*/
static void TAG(triangle)(GLcontext *ctx, GLuint e0, GLuint e1, GLuint e2 )
{
struct vertex_buffer *VB = &TNL_CONTEXT(ctx)->vb;
SWvertex *verts = SWSETUP_CONTEXT(ctx)->verts;
SWvertex *v[3];
GLfloat z[3];
GLfloat offset;
GLenum mode = GL_FILL;
GLuint facing = 0;
GLchan saved_color[3][4];
GLchan saved_spec[3][4];
GLfloat saved_index[3];
v[0] = &verts[e0];
v[1] = &verts[e1];
v[2] = &verts[e2];
if (IND & (SS_TWOSIDE_BIT | SS_OFFSET_BIT | SS_UNFILLED_BIT))
{
GLfloat ex = v[0]->win[0] - v[2]->win[0];
GLfloat ey = v[0]->win[1] - v[2]->win[1];
GLfloat fx = v[1]->win[0] - v[2]->win[0];
GLfloat fy = v[1]->win[1] - v[2]->win[1];
GLfloat cc = ex*fy - ey*fx;
if (IND & (SS_TWOSIDE_BIT | SS_UNFILLED_BIT))
{
facing = (cc < 0.0) ^ ctx->Polygon._FrontBit;
if (ctx->Stencil.TestTwoSide)
ctx->_Facing = facing; /* for 2-sided stencil test */
if (IND & SS_UNFILLED_BIT)
mode = facing ? ctx->Polygon.BackMode : ctx->Polygon.FrontMode;
if (facing == 1) {
if (IND & SS_TWOSIDE_BIT) {
if (IND & SS_RGBA_BIT) {
GLfloat (*vbcolor)[4] = VB->ColorPtr[1]->data;
COPY_CHAN4(saved_color[0], v[0]->color);
COPY_CHAN4(saved_color[1], v[1]->color);
COPY_CHAN4(saved_color[2], v[2]->color);
if (VB->ColorPtr[1]->stride) {
SS_COLOR(v[0]->color, vbcolor[e0]);
SS_COLOR(v[1]->color, vbcolor[e1]);
SS_COLOR(v[2]->color, vbcolor[e2]);
}
else {
SS_COLOR(v[0]->color, vbcolor[0]);
SS_COLOR(v[1]->color, vbcolor[0]);
SS_COLOR(v[2]->color, vbcolor[0]);
}
if (VB->SecondaryColorPtr[1]) {
GLfloat (*vbspec)[4] = VB->SecondaryColorPtr[1]->data;
COPY_CHAN4(saved_spec[0], v[0]->specular);
COPY_CHAN4(saved_spec[1], v[1]->specular);
COPY_CHAN4(saved_spec[2], v[2]->specular);
if (VB->SecondaryColorPtr[1]->stride) {
SS_SPEC(v[0]->specular, vbspec[e0]);
SS_SPEC(v[1]->specular, vbspec[e1]);
SS_SPEC(v[2]->specular, vbspec[e2]);
}
else {
SS_SPEC(v[0]->specular, vbspec[0]);
SS_SPEC(v[1]->specular, vbspec[0]);
SS_SPEC(v[2]->specular, vbspec[0]);
}
}
} else {
GLfloat *vbindex = (GLfloat *)VB->IndexPtr[1]->data;
saved_index[0] = v[0]->index;
saved_index[1] = v[1]->index;
saved_index[2] = v[2]->index;
SS_IND(v[0]->index, (GLuint) vbindex[e0]);
SS_IND(v[1]->index, (GLuint) vbindex[e1]);
SS_IND(v[2]->index, (GLuint) vbindex[e2]);
}
}
}
}
if (IND & SS_OFFSET_BIT)
{
offset = ctx->Polygon.OffsetUnits * ctx->DrawBuffer->_MRD;
z[0] = v[0]->win[2];
z[1] = v[1]->win[2];
z[2] = v[2]->win[2];
if (cc * cc > 1e-16) {
const GLfloat ez = z[0] - z[2];
const GLfloat fz = z[1] - z[2];
const GLfloat oneOverArea = 1.0F / cc;
const GLfloat dzdx = FABSF((ey * fz - ez * fy) * oneOverArea);
const GLfloat dzdy = FABSF((ez * fx - ex * fz) * oneOverArea);
offset += MAX2(dzdx, dzdy) * ctx->Polygon.OffsetFactor;
/* Unfortunately, we need to clamp to prevent negative Zs below.
* Technically, we should do the clamping per-fragment.
*/
offset = MAX2(offset, -v[0]->win[2]);
offset = MAX2(offset, -v[1]->win[2]);
offset = MAX2(offset, -v[2]->win[2]);
}
}
}
if (mode == GL_POINT) {
if ((IND & SS_OFFSET_BIT) && ctx->Polygon.OffsetPoint) {
v[0]->win[2] += offset;
v[1]->win[2] += offset;
v[2]->win[2] += offset;
}
_swsetup_render_point_tri( ctx, e0, e1, e2, facing );
} else if (mode == GL_LINE) {
if ((IND & SS_OFFSET_BIT) && ctx->Polygon.OffsetLine) {
v[0]->win[2] += offset;
v[1]->win[2] += offset;
v[2]->win[2] += offset;
}
_swsetup_render_line_tri( ctx, e0, e1, e2, facing );
} else {
if ((IND & SS_OFFSET_BIT) && ctx->Polygon.OffsetFill) {
v[0]->win[2] += offset;
v[1]->win[2] += offset;
v[2]->win[2] += offset;
}
_swrast_Triangle( ctx, v[0], v[1], v[2] );
}
if (IND & SS_OFFSET_BIT) {
v[0]->win[2] = z[0];
v[1]->win[2] = z[1];
v[2]->win[2] = z[2];
}
if (IND & SS_TWOSIDE_BIT) {
if (facing == 1) {
if (IND & SS_RGBA_BIT) {
COPY_CHAN4(v[0]->color, saved_color[0]);
COPY_CHAN4(v[1]->color, saved_color[1]);
COPY_CHAN4(v[2]->color, saved_color[2]);
if (VB->SecondaryColorPtr[1]) {
COPY_CHAN4(v[0]->specular, saved_spec[0]);
COPY_CHAN4(v[1]->specular, saved_spec[1]);
COPY_CHAN4(v[2]->specular, saved_spec[2]);
}
} else {
v[0]->index = saved_index[0];
v[1]->index = saved_index[1];
v[2]->index = saved_index[2];
}
}
}
}
/* Need to fixup edgeflags when decomposing to triangles:
*/
static void TAG(quadfunc)( GLcontext *ctx, GLuint v0,
GLuint v1, GLuint v2, GLuint v3 )
{
if (IND & SS_UNFILLED_BIT) {
struct vertex_buffer *VB = &TNL_CONTEXT(ctx)->vb;
GLubyte ef1 = VB->EdgeFlag[v1];
GLubyte ef3 = VB->EdgeFlag[v3];
VB->EdgeFlag[v1] = 0;
TAG(triangle)( ctx, v0, v1, v3 );
VB->EdgeFlag[v1] = ef1;
VB->EdgeFlag[v3] = 0;
TAG(triangle)( ctx, v1, v2, v3 );
VB->EdgeFlag[v3] = ef3;
} else {
TAG(triangle)( ctx, v0, v1, v3 );
TAG(triangle)( ctx, v1, v2, v3 );
}
}
static void TAG(init)( void )
{
tri_tab[IND] = TAG(triangle);
quad_tab[IND] = TAG(quadfunc);
}
#undef IND
#undef TAG
|
