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
28static 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
35static Bool
36glamor_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
123bail:
124    glDisable(GL_SCISSOR_TEST);
125    glDisableVertexAttribArray(GLAMOR_VERTEX_POS);
126
127    return ret;
128}
129
130static Bool
131glamor_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
152static void
153glamor_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
162void
163glamor_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