1 /*
2 * Copyright © 2014 Keith Packard
3 *
4 * Permission to use, copy, modify, distribute, and sell this software and its
5 * documentation for any purpose is hereby granted without fee, provided that
6 * the above copyright notice appear in all copies and that both that copyright
7 * notice and this permission notice appear in supporting documentation, and
8 * that the name of the copyright holders not be used in advertising or
9 * publicity pertaining to distribution of the software without specific,
10 * written prior permission. The copyright holders make no representations
11 * about the suitability of this software for any purpose. It is provided "as
12 * is" without express or implied warranty.
13 *
14 * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
15 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
16 * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
17 * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
18 * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
19 * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
20 * OF THIS SOFTWARE.
21 */
22
23 #include "glamor_priv.h"
24 #include "glamor_program.h"
25 #include "glamor_transform.h"
26 #include "glamor_prepare.h"
27
28 static const glamor_facet glamor_facet_poly_lines = {
29 .name = "poly_lines",
30 .vs_vars = "attribute vec2 primitive;\n",
31 .vs_exec = (" vec2 pos = vec2(0.0,0.0);\n"
32 GLAMOR_POS(gl_Position, primitive.xy)),
33 };
34
35 static Bool
glamor_poly_lines_solid_gl(DrawablePtr drawable,GCPtr gc,int mode,int n,DDXPointPtr points)36 glamor_poly_lines_solid_gl(DrawablePtr drawable, GCPtr gc,
37 int mode, int n, DDXPointPtr points)
38 {
39 ScreenPtr screen = drawable->pScreen;
40 glamor_screen_private *glamor_priv = glamor_get_screen_private(screen);
41 PixmapPtr pixmap = glamor_get_drawable_pixmap(drawable);
42 glamor_pixmap_private *pixmap_priv;
43 glamor_program *prog;
44 int off_x, off_y;
45 DDXPointPtr v;
46 char *vbo_offset;
47 int box_index;
48 int add_last;
49 Bool ret = FALSE;
50
51 pixmap_priv = glamor_get_pixmap_private(pixmap);
52 if (!GLAMOR_PIXMAP_PRIV_HAS_FBO(pixmap_priv))
53 goto bail;
54
55 add_last = 0;
56 if (gc->capStyle != CapNotLast)
57 add_last = 1;
58
59 if (n < 2)
60 return TRUE;
61
62 glamor_make_current(glamor_priv);
63
64 prog = glamor_use_program_fill(pixmap, gc,
65 &glamor_priv->poly_line_program,
66 &glamor_facet_poly_lines);
67
68 if (!prog)
69 goto bail;
70
71 /* Set up the vertex buffers for the points */
72
73 v = glamor_get_vbo_space(drawable->pScreen,
74 (n + add_last) * sizeof (DDXPointRec),
75 &vbo_offset);
76
77 glEnableVertexAttribArray(GLAMOR_VERTEX_POS);
78 glVertexAttribPointer(GLAMOR_VERTEX_POS, 2, GL_SHORT, GL_FALSE,
79 sizeof (DDXPointRec), vbo_offset);
80
81 if (mode == CoordModePrevious) {
82 int i;
83 DDXPointRec here = { 0, 0 };
84
85 for (i = 0; i < n; i++) {
86 here.x += points[i].x;
87 here.y += points[i].y;
88 v[i] = here;
89 }
90 } else {
91 memcpy(v, points, n * sizeof (DDXPointRec));
92 }
93
94 if (add_last) {
95 v[n].x = v[n-1].x + 1;
96 v[n].y = v[n-1].y;
97 }
98
99 glamor_put_vbo_space(screen);
100
101 glEnable(GL_SCISSOR_TEST);
102
103 glamor_pixmap_loop(pixmap_priv, box_index) {
104 int nbox = RegionNumRects(gc->pCompositeClip);
105 BoxPtr box = RegionRects(gc->pCompositeClip);
106
107 if (!glamor_set_destination_drawable(drawable, box_index, TRUE, TRUE,
108 prog->matrix_uniform, &off_x, &off_y))
109 goto bail;
110
111 while (nbox--) {
112 glScissor(box->x1 + off_x,
113 box->y1 + off_y,
114 box->x2 - box->x1,
115 box->y2 - box->y1);
116 box++;
117 glDrawArrays(GL_LINE_STRIP, 0, n + add_last);
118 }
119 }
120
121 ret = TRUE;
122
123 bail:
124 glDisable(GL_SCISSOR_TEST);
125 glDisableVertexAttribArray(GLAMOR_VERTEX_POS);
126
127 return ret;
128 }
129
130 static Bool
glamor_poly_lines_gl(DrawablePtr drawable,GCPtr gc,int mode,int n,DDXPointPtr points)131 glamor_poly_lines_gl(DrawablePtr drawable, GCPtr gc,
132 int mode, int n, DDXPointPtr points)
133 {
134 if (gc->lineWidth != 0)
135 return FALSE;
136
137 switch (gc->lineStyle) {
138 case LineSolid:
139 return glamor_poly_lines_solid_gl(drawable, gc, mode, n, points);
140 case LineOnOffDash:
141 return glamor_poly_lines_dash_gl(drawable, gc, mode, n, points);
142 case LineDoubleDash:
143 if (gc->fillStyle == FillTiled)
144 return glamor_poly_lines_solid_gl(drawable, gc, mode, n, points);
145 else
146 return glamor_poly_lines_dash_gl(drawable, gc, mode, n, points);
147 default:
148 return FALSE;
149 }
150 }
151
152 static void
glamor_poly_lines_bail(DrawablePtr drawable,GCPtr gc,int mode,int n,DDXPointPtr points)153 glamor_poly_lines_bail(DrawablePtr drawable, GCPtr gc,
154 int mode, int n, DDXPointPtr points)
155 {
156 glamor_fallback("to %p (%c)\n", drawable,
157 glamor_get_drawable_location(drawable));
158
159 miPolylines(drawable, gc, mode, n, points);
160 }
161
162 void
glamor_poly_lines(DrawablePtr drawable,GCPtr gc,int mode,int n,DDXPointPtr points)163 glamor_poly_lines(DrawablePtr drawable, GCPtr gc,
164 int mode, int n, DDXPointPtr points)
165 {
166 if (glamor_poly_lines_gl(drawable, gc, mode, n, points))
167 return;
168 glamor_poly_lines_bail(drawable, gc, mode, n, points);
169 }
170