2 * This file is part of the sigrok project.
4 * Copyright (C) 2012 Joel Holdsworth <joel@airwebreathe.org.uk>
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
21 #define GL_GLEXT_PROTOTYPES
27 #include "logicdata.h"
28 #include "logicdatasnapshot.h"
29 #include "logicsignal.h"
31 using namespace boost;
34 const float Log2 = logf(2.0f);
36 LogicSignal::LogicSignal(QString name, shared_ptr<LogicData> data,
40 _probe_index(probe_index)
42 assert(_probe_index >= 0);
45 void LogicSignal::paint(QGLWidget &widget, const QRect &rect,
46 double scale, double offset)
50 vector< pair<int64_t, bool> > edges;
55 const queue< shared_ptr<LogicDataSnapshot> > &snapshots =
56 _data->get_snapshots();
60 const shared_ptr<LogicDataSnapshot> &snapshot = snapshots.front();
62 const double pixels_offset = offset / scale;
63 const double samplerate = _data->get_samplerate();
64 const double start_time = _data->get_start_time();
65 const int64_t last_sample = (int64_t)snapshot->get_sample_count() - 1;
66 const double samples_per_pixel = samplerate * scale;
67 const int64_t start = min(max((int64_t)(samplerate * (offset - start_time)),
68 (int64_t)0), last_sample);
69 const int64_t end = min((int64_t)(start + samples_per_pixel * rect.width()),
71 const int64_t quantization_length = 1LL << (int64_t)floorf(
72 max(logf(samples_per_pixel / Log2), 0.0f));
74 snapshot->get_subsampled_edges(edges, start, end,
75 quantization_length, _probe_index);
78 const unsigned int edge_point_count = (edges.size() - 2) * 2;
79 Point2F *const edge_points = new Point2F[edge_point_count];
82 for(vector<LogicDataSnapshot::EdgePair>::const_iterator i = edges.begin() + 1;
83 i != edges.end() - 1; i++)
85 const int x = (int)((*i).first / samples_per_pixel - pixels_offset) +
88 vertex->x = x, vertex->y = 10 + rect.top() - 1;
90 vertex->x = x, vertex->y = 40 + rect.top();
95 paint_lines(edge_points, edge_point_count);
99 const unsigned int cap_point_count = (edges.size() - 1) * 2;
100 Point2F *const cap_points = new Point2F[cap_point_count];
103 for(vector<LogicDataSnapshot::EdgePair>::const_iterator i = edges.begin();
104 i != (edges.end() - 1); i++)
106 const int y = ((*i).second ? 10 : 40) + rect.top();
108 vertex->x = (int)((*i).first / samples_per_pixel - pixels_offset) +
113 vertex->x = (int)((*(i+1)).first / samples_per_pixel - pixels_offset) +
120 paint_lines(cap_points, cap_point_count);
124 void LogicSignal::paint_lines(Point2F *points, int count)
130 glGenBuffers(1, &vbo_id);
131 glBindBuffer(GL_ARRAY_BUFFER, vbo_id);
133 const unsigned int vbo_length = count * sizeof(Point2F);
134 glBufferData(GL_ARRAY_BUFFER, vbo_length, NULL, GL_STATIC_DRAW);
135 glBufferSubData(GL_ARRAY_BUFFER, 0, vbo_length, points);
137 glBindBuffer(GL_ARRAY_BUFFER, vbo_id);
139 glVertexPointer(2, GL_FLOAT, sizeof(Point2F), 0);
141 glEnableClientState(GL_VERTEX_ARRAY);
142 glDrawArrays(GL_LINES, 0, count);
143 glDisableClientState(GL_VERTEX_ARRAY);
145 glDeleteBuffers(1, &vbo_id);