2 * Mesa 3-D graphics library
5 * Copyright (C) 1999-2007 Brian Paul All Rights Reserved.
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:
14 * The above copyright notice and this permission notice shall be included
15 * in all copies or substantial portions of the Software.
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.
27 * Antialiased line template.
32 * Function to render each fragment in the AA line.
33 * \param ix - integer fragment window X coordiante
34 * \param iy - integer fragment window Y coordiante
37 NAME(plot
)(GLcontext
*ctx
, struct LineInfo
*line
, int ix
, int iy
)
39 const SWcontext
*swrast
= SWRAST_CONTEXT(ctx
);
40 const GLfloat fx
= (GLfloat
) ix
;
41 const GLfloat fy
= (GLfloat
) iy
;
43 const GLfloat coverage
= compute_coveragei(line
, ix
, iy
);
45 const GLfloat coverage
= compute_coveragef(line
, ix
, iy
);
47 const GLuint i
= line
->span
.end
;
55 line
->span
.array
->coverage
[i
] = coverage
;
56 line
->span
.array
->x
[i
] = ix
;
57 line
->span
.array
->y
[i
] = iy
;
60 * Compute Z, color, texture coords, fog for the fragment by
61 * solving the plane equations at (ix,iy).
64 line
->span
.array
->z
[i
] = (GLuint
) solve_plane(fx
, fy
, line
->zPlane
);
67 line
->span
.array
->attribs
[FRAG_ATTRIB_FOGC
][i
][0] = solve_plane(fx
, fy
, line
->fPlane
);
70 line
->span
.array
->rgba
[i
][RCOMP
] = solve_plane_chan(fx
, fy
, line
->rPlane
);
71 line
->span
.array
->rgba
[i
][GCOMP
] = solve_plane_chan(fx
, fy
, line
->gPlane
);
72 line
->span
.array
->rgba
[i
][BCOMP
] = solve_plane_chan(fx
, fy
, line
->bPlane
);
73 line
->span
.array
->rgba
[i
][ACOMP
] = solve_plane_chan(fx
, fy
, line
->aPlane
);
76 line
->span
.array
->index
[i
] = (GLint
) solve_plane(fx
, fy
, line
->iPlane
);
79 line
->span
.array
->spec
[i
][RCOMP
] = solve_plane_chan(fx
, fy
, line
->srPlane
);
80 line
->span
.array
->spec
[i
][GCOMP
] = solve_plane_chan(fx
, fy
, line
->sgPlane
);
81 line
->span
.array
->spec
[i
][BCOMP
] = solve_plane_chan(fx
, fy
, line
->sbPlane
);
83 #if defined(DO_ATTRIBS)
85 GLfloat (*attribArray
)[4] = line
->span
.array
->attribs
[attr
];
87 if (ctx
->FragmentProgram
._Active
) {
91 invQ
= solve_plane_recip(fx
, fy
, line
->vPlane
[attr
]);
93 attribArray
[i
][0] = solve_plane(fx
, fy
, line
->sPlane
[attr
]) * invQ
;
94 attribArray
[i
][1] = solve_plane(fx
, fy
, line
->tPlane
[attr
]) * invQ
;
95 attribArray
[i
][2] = solve_plane(fx
, fy
, line
->uPlane
[attr
]) * invQ
;
96 if (attr
< FRAG_ATTRIB_VAR0
&& attr
>= FRAG_ATTRIB_TEX0
) {
97 const GLuint unit
= attr
- FRAG_ATTRIB_TEX0
;
98 line
->span
.array
->lambda
[unit
][i
]
99 = compute_lambda(line
->sPlane
[attr
],
100 line
->tPlane
[attr
], invQ
,
101 line
->texWidth
[attr
], line
->texHeight
[attr
]);
106 if (line
->span
.end
== MAX_WIDTH
) {
108 _swrast_write_rgba_span(ctx
, &(line
->span
));
110 _swrast_write_index_span(ctx
, &(line
->span
));
112 line
->span
.end
= 0; /* reset counter */
122 NAME(line
)(GLcontext
*ctx
, const SWvertex
*v0
, const SWvertex
*v1
)
124 SWcontext
*swrast
= SWRAST_CONTEXT(ctx
);
125 GLfloat tStart
, tEnd
; /* segment start, end along line length */
129 /* Init the LineInfo struct */
130 struct LineInfo line
;
131 line
.x0
= v0
->win
[0];
132 line
.y0
= v0
->win
[1];
133 line
.x1
= v1
->win
[0];
134 line
.y1
= v1
->win
[1];
135 line
.dx
= line
.x1
- line
.x0
;
136 line
.dy
= line
.y1
- line
.y0
;
137 line
.len
= SQRTF(line
.dx
* line
.dx
+ line
.dy
* line
.dy
);
138 line
.halfWidth
= 0.5F
* ctx
->Line
._Width
;
140 if (line
.len
== 0.0 || IS_INF_OR_NAN(line
.len
))
143 INIT_SPAN(line
.span
, GL_LINE
, 0, 0, SPAN_XY
| SPAN_COVERAGE
);
145 line
.xAdj
= line
.dx
/ line
.len
* line
.halfWidth
;
146 line
.yAdj
= line
.dy
/ line
.len
* line
.halfWidth
;
149 line
.span
.arrayMask
|= SPAN_Z
;
150 compute_plane(line
.x0
, line
.y0
, line
.x1
, line
.y1
,
151 v0
->win
[2], v1
->win
[2], line
.zPlane
);
154 line
.span
.arrayMask
|= SPAN_FOG
;
155 compute_plane(line
.x0
, line
.y0
, line
.x1
, line
.y1
,
156 v0
->attrib
[FRAG_ATTRIB_FOGC
][0],
157 v1
->attrib
[FRAG_ATTRIB_FOGC
][0],
161 line
.span
.arrayMask
|= SPAN_RGBA
;
162 if (ctx
->Light
.ShadeModel
== GL_SMOOTH
) {
163 compute_plane(line
.x0
, line
.y0
, line
.x1
, line
.y1
,
164 v0
->color
[RCOMP
], v1
->color
[RCOMP
], line
.rPlane
);
165 compute_plane(line
.x0
, line
.y0
, line
.x1
, line
.y1
,
166 v0
->color
[GCOMP
], v1
->color
[GCOMP
], line
.gPlane
);
167 compute_plane(line
.x0
, line
.y0
, line
.x1
, line
.y1
,
168 v0
->color
[BCOMP
], v1
->color
[BCOMP
], line
.bPlane
);
169 compute_plane(line
.x0
, line
.y0
, line
.x1
, line
.y1
,
170 v0
->color
[ACOMP
], v1
->color
[ACOMP
], line
.aPlane
);
173 constant_plane(v1
->color
[RCOMP
], line
.rPlane
);
174 constant_plane(v1
->color
[GCOMP
], line
.gPlane
);
175 constant_plane(v1
->color
[BCOMP
], line
.bPlane
);
176 constant_plane(v1
->color
[ACOMP
], line
.aPlane
);
180 line
.span
.arrayMask
|= SPAN_SPEC
;
181 if (ctx
->Light
.ShadeModel
== GL_SMOOTH
) {
182 compute_plane(line
.x0
, line
.y0
, line
.x1
, line
.y1
,
183 v0
->specular
[RCOMP
], v1
->specular
[RCOMP
], line
.srPlane
);
184 compute_plane(line
.x0
, line
.y0
, line
.x1
, line
.y1
,
185 v0
->specular
[GCOMP
], v1
->specular
[GCOMP
], line
.sgPlane
);
186 compute_plane(line
.x0
, line
.y0
, line
.x1
, line
.y1
,
187 v0
->specular
[BCOMP
], v1
->specular
[BCOMP
], line
.sbPlane
);
190 constant_plane(v1
->specular
[RCOMP
], line
.srPlane
);
191 constant_plane(v1
->specular
[GCOMP
], line
.sgPlane
);
192 constant_plane(v1
->specular
[BCOMP
], line
.sbPlane
);
196 line
.span
.arrayMask
|= SPAN_INDEX
;
197 if (ctx
->Light
.ShadeModel
== GL_SMOOTH
) {
198 compute_plane(line
.x0
, line
.y0
, line
.x1
, line
.y1
,
199 v0
->index
, v1
->index
, line
.iPlane
);
202 constant_plane(v1
->index
, line
.iPlane
);
205 #if defined(DO_ATTRIBS)
207 const GLfloat invW0
= v0
->win
[3];
208 const GLfloat invW1
= v1
->win
[3];
209 line
.span
.arrayMask
|= (SPAN_TEXTURE
| SPAN_LAMBDA
| SPAN_VARYING
);
211 const GLfloat s0
= v0
->attrib
[attr
][0] * invW0
;
212 const GLfloat s1
= v1
->attrib
[attr
][0] * invW1
;
213 const GLfloat t0
= v0
->attrib
[attr
][1] * invW0
;
214 const GLfloat t1
= v1
->attrib
[attr
][1] * invW1
;
215 const GLfloat r0
= v0
->attrib
[attr
][2] * invW0
;
216 const GLfloat r1
= v1
->attrib
[attr
][2] * invW1
;
217 const GLfloat q0
= v0
->attrib
[attr
][3] * invW0
;
218 const GLfloat q1
= v1
->attrib
[attr
][3] * invW1
;
219 compute_plane(line
.x0
, line
.y0
, line
.x1
, line
.y1
, s0
, s1
, line
.sPlane
[attr
]);
220 compute_plane(line
.x0
, line
.y0
, line
.x1
, line
.y1
, t0
, t1
, line
.tPlane
[attr
]);
221 compute_plane(line
.x0
, line
.y0
, line
.x1
, line
.y1
, r0
, r1
, line
.uPlane
[attr
]);
222 compute_plane(line
.x0
, line
.y0
, line
.x1
, line
.y1
, q0
, q1
, line
.vPlane
[attr
]);
223 if (attr
< FRAG_ATTRIB_VAR0
&& attr
>= FRAG_ATTRIB_TEX0
) {
224 const GLuint u
= attr
- FRAG_ATTRIB_TEX0
;
225 const struct gl_texture_object
*obj
= ctx
->Texture
.Unit
[u
]._Current
;
226 const struct gl_texture_image
*texImage
= obj
->Image
[0][obj
->BaseLevel
];
227 line
.texWidth
[attr
] = (GLfloat
) texImage
->Width
;
228 line
.texHeight
[attr
] = (GLfloat
) texImage
->Height
;
235 inSegment
= GL_FALSE
;
236 iLen
= (GLint
) line
.len
;
238 if (ctx
->Line
.StippleFlag
) {
239 for (i
= 0; i
< iLen
; i
++) {
240 const GLuint bit
= (swrast
->StippleCounter
/ ctx
->Line
.StippleFactor
) & 0xf;
241 if ((1 << bit
) & ctx
->Line
.StipplePattern
) {
242 /* stipple bit is on */
243 const GLfloat t
= (GLfloat
) i
/ (GLfloat
) line
.len
;
245 /* start new segment */
250 /* still in the segment, extend it */
255 /* stipple bit is off */
256 if (inSegment
&& (tEnd
> tStart
)) {
257 /* draw the segment */
258 segment(ctx
, &line
, NAME(plot
), tStart
, tEnd
);
259 inSegment
= GL_FALSE
;
262 /* still between segments, do nothing */
265 swrast
->StippleCounter
++;
269 /* draw the final segment of the line */
270 segment(ctx
, &line
, NAME(plot
), tStart
, 1.0F
);
275 segment(ctx
, &line
, NAME(plot
), 0.0, 1.0);
279 _swrast_write_rgba_span(ctx
, &(line
.span
));
281 _swrast_write_index_span(ctx
, &(line
.span
));