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
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
|
/*
* Mesa 3-D graphics library
*
* Copyright (C) 1999-2007 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
* THE AUTHORS OR COPYRIGHT HOLDERS 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 <keithw@vmware.com>
*/
/**
* This is where we handle assigning vertex colors based on front/back
* facing, compute polygon offset and handle glPolygonMode().
*/
static void TAG(triangle)(struct gl_context *ctx, GLuint e0, GLuint e1, GLuint e2 )
{
struct vertex_buffer *VB = &TNL_CONTEXT(ctx)->vb;
SScontext *swsetup = SWSETUP_CONTEXT(ctx);
SWvertex *verts = SWSETUP_CONTEXT(ctx)->verts;
SWvertex *v[3];
GLfloat z[3];
GLfloat offset, oz0, oz1, oz2;
GLenum mode = GL_FILL;
GLuint facing = 0;
GLchan saved_color[3][4] = { { 0 } };
GLfloat saved_col0[3][4] = { { 0 } };
GLfloat saved_spec[3][4] = { { 0 } };
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]->attrib[VARYING_SLOT_POS][0] - v[2]->attrib[VARYING_SLOT_POS][0];
GLfloat ey = v[0]->attrib[VARYING_SLOT_POS][1] - v[2]->attrib[VARYING_SLOT_POS][1];
GLfloat fx = v[1]->attrib[VARYING_SLOT_POS][0] - v[2]->attrib[VARYING_SLOT_POS][0];
GLfloat fy = v[1]->attrib[VARYING_SLOT_POS][1] - v[2]->attrib[VARYING_SLOT_POS][1];
GLfloat cc = ex*fy - ey*fx;
if (IND & (SS_TWOSIDE_BIT | SS_UNFILLED_BIT))
{
facing = (cc < 0.0) ^ ctx->Polygon._FrontBit;
if (IND & SS_UNFILLED_BIT)
mode = facing ? ctx->Polygon.BackMode : ctx->Polygon.FrontMode;
if (facing == 1) {
if (IND & SS_TWOSIDE_BIT) {
if (VB->BackfaceColorPtr) {
GLfloat (*vbcolor)[4] = VB->BackfaceColorPtr->data;
if (swsetup->intColors) {
COPY_CHAN4(saved_color[0], v[0]->color);
COPY_CHAN4(saved_color[1], v[1]->color);
COPY_CHAN4(saved_color[2], v[2]->color);
}
else {
COPY_4V(saved_col0[0], v[0]->attrib[VARYING_SLOT_COL0]);
COPY_4V(saved_col0[1], v[1]->attrib[VARYING_SLOT_COL0]);
COPY_4V(saved_col0[2], v[2]->attrib[VARYING_SLOT_COL0]);
}
if (VB->BackfaceColorPtr->stride) {
if (swsetup->intColors) {
SS_COLOR(v[0]->color, vbcolor[e0]);
SS_COLOR(v[1]->color, vbcolor[e1]);
SS_COLOR(v[2]->color, vbcolor[e2]);
}
else {
COPY_4V(v[0]->attrib[VARYING_SLOT_COL0], vbcolor[e0]);
COPY_4V(v[1]->attrib[VARYING_SLOT_COL0], vbcolor[e1]);
COPY_4V(v[2]->attrib[VARYING_SLOT_COL0], vbcolor[e2]);
}
}
else {
/* flat shade */
if (swsetup->intColors) {
SS_COLOR(v[0]->color, vbcolor[0]);
SS_COLOR(v[1]->color, vbcolor[0]);
SS_COLOR(v[2]->color, vbcolor[0]);
}
else {
COPY_4V(v[0]->attrib[VARYING_SLOT_COL0], vbcolor[0]);
COPY_4V(v[1]->attrib[VARYING_SLOT_COL0], vbcolor[0]);
COPY_4V(v[2]->attrib[VARYING_SLOT_COL0], vbcolor[0]);
}
}
}
if (VB->BackfaceSecondaryColorPtr) {
GLfloat (*vbspec)[4] = VB->BackfaceSecondaryColorPtr->data;
COPY_4V(saved_spec[0], v[0]->attrib[VARYING_SLOT_COL1]);
COPY_4V(saved_spec[1], v[1]->attrib[VARYING_SLOT_COL1]);
COPY_4V(saved_spec[2], v[2]->attrib[VARYING_SLOT_COL1]);
if (VB->BackfaceSecondaryColorPtr->stride) {
SS_SPEC(v[0]->attrib[VARYING_SLOT_COL1], vbspec[e0]);
SS_SPEC(v[1]->attrib[VARYING_SLOT_COL1], vbspec[e1]);
SS_SPEC(v[2]->attrib[VARYING_SLOT_COL1], vbspec[e2]);
}
else {
SS_SPEC(v[0]->attrib[VARYING_SLOT_COL1], vbspec[0]);
SS_SPEC(v[1]->attrib[VARYING_SLOT_COL1], vbspec[0]);
SS_SPEC(v[2]->attrib[VARYING_SLOT_COL1], vbspec[0]);
}
}
}
}
}
if (IND & SS_OFFSET_BIT) {
const GLfloat max = ctx->DrawBuffer->_DepthMaxF;
/* save original Z values (restored later) */
z[0] = v[0]->attrib[VARYING_SLOT_POS][2];
z[1] = v[1]->attrib[VARYING_SLOT_POS][2];
z[2] = v[2]->attrib[VARYING_SLOT_POS][2];
/* Note that Z values are already scaled to [0,65535] (for example)
* so no MRD value is used here.
*/
offset = ctx->Polygon.OffsetUnits;
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;
}
/* new Z values */
oz0 = CLAMP(v[0]->attrib[VARYING_SLOT_POS][2] + offset, 0.0F, max);
oz1 = CLAMP(v[1]->attrib[VARYING_SLOT_POS][2] + offset, 0.0F, max);
oz2 = CLAMP(v[2]->attrib[VARYING_SLOT_POS][2] + offset, 0.0F, max);
}
}
if (mode == GL_POINT) {
if ((IND & SS_OFFSET_BIT) && ctx->Polygon.OffsetPoint) {
v[0]->attrib[VARYING_SLOT_POS][2] = oz0;
v[1]->attrib[VARYING_SLOT_POS][2] = oz1;
v[2]->attrib[VARYING_SLOT_POS][2] = oz2;
}
_swsetup_render_tri(ctx, e0, e1, e2, facing, _swsetup_edge_render_point_tri);
} else if (mode == GL_LINE) {
if ((IND & SS_OFFSET_BIT) && ctx->Polygon.OffsetLine) {
v[0]->attrib[VARYING_SLOT_POS][2] = oz0;
v[1]->attrib[VARYING_SLOT_POS][2] = oz1;
v[2]->attrib[VARYING_SLOT_POS][2] = oz2;
}
_swsetup_render_tri(ctx, e0, e1, e2, facing, _swsetup_edge_render_line_tri);
} else {
if ((IND & SS_OFFSET_BIT) && ctx->Polygon.OffsetFill) {
v[0]->attrib[VARYING_SLOT_POS][2] = oz0;
v[1]->attrib[VARYING_SLOT_POS][2] = oz1;
v[2]->attrib[VARYING_SLOT_POS][2] = oz2;
}
_swrast_Triangle( ctx, v[0], v[1], v[2] );
}
/*
* Restore original vertex colors, etc.
*/
if (IND & SS_OFFSET_BIT) {
v[0]->attrib[VARYING_SLOT_POS][2] = z[0];
v[1]->attrib[VARYING_SLOT_POS][2] = z[1];
v[2]->attrib[VARYING_SLOT_POS][2] = z[2];
}
if (IND & SS_TWOSIDE_BIT) {
if (facing == 1) {
if (VB->BackfaceColorPtr) {
if (swsetup->intColors) {
COPY_CHAN4(v[0]->color, saved_color[0]);
COPY_CHAN4(v[1]->color, saved_color[1]);
COPY_CHAN4(v[2]->color, saved_color[2]);
}
else {
COPY_4V(v[0]->attrib[VARYING_SLOT_COL0], saved_col0[0]);
COPY_4V(v[1]->attrib[VARYING_SLOT_COL0], saved_col0[1]);
COPY_4V(v[2]->attrib[VARYING_SLOT_COL0], saved_col0[2]);
}
}
if (VB->BackfaceSecondaryColorPtr) {
COPY_4V(v[0]->attrib[VARYING_SLOT_COL1], saved_spec[0]);
COPY_4V(v[1]->attrib[VARYING_SLOT_COL1], saved_spec[1]);
COPY_4V(v[2]->attrib[VARYING_SLOT_COL1], saved_spec[2]);
}
}
}
}
/* Need to fixup edgeflags when decomposing to triangles:
*/
static void TAG(quadfunc)( struct gl_context *ctx, GLuint v0,
GLuint v1, GLuint v2, GLuint v3 )
{
if (IND & SS_UNFILLED_BIT) {
struct vertex_buffer *VB = &TNL_CONTEXT(ctx)->vb;
if (VB->EdgeFlag) { /* XXX this test shouldn't be needed (bug 12614) */
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
|
