7580138fe24e87af7c164c595392968a36a08133
[pulseview.git] / logicsignal.cpp
1 /*
2  * This file is part of the sigrok project.
3  *
4  * Copyright (C) 2012 Joel Holdsworth <joel@airwebreathe.org.uk>
5  *
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.
10  *
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.
15  *
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
19  */
20
21 #define GL_GLEXT_PROTOTYPES
22 #include <GL/gl.h>
23 #include <GL/glext.h>
24
25 #include <math.h>
26
27 #include "extdef.h"
28
29 #include "logicdata.h"
30 #include "logicdatasnapshot.h"
31 #include "logicsignal.h"
32
33 using namespace boost;
34 using namespace std;
35
36 const float LogicSignal::Margin = 10.0f;
37
38 const float LogicSignal::EdgeColour[3] =        {0.50f, 0.50f, 0.50f};
39 const float LogicSignal::HighColour[3] =        {0.00f, 0.75f, 0.00f};
40 const float LogicSignal::LowColour[3] = {0.75f, 0.00f, 0.00f};
41
42 const QColor LogicSignal::LogicSignalColours[10] = {
43         QColor(0x16, 0x19, 0x1A),       // Black
44         QColor(0x8F, 0x52, 0x02),       // Brown
45         QColor(0xCC, 0x00, 0x00),       // Red
46         QColor(0xF5, 0x79, 0x00),       // Orange
47         QColor(0xED, 0xD4, 0x00),       // Yellow
48         QColor(0x73, 0xD2, 0x16),       // Green
49         QColor(0x34, 0x65, 0xA4),       // Blue
50         QColor(0x75, 0x50, 0x7B),       // Violet
51         QColor(0x88, 0x8A, 0x85),       // Grey
52         QColor(0xEE, 0xEE, 0xEC),       // White
53 };
54
55 LogicSignal::LogicSignal(QString name, shared_ptr<LogicData> data,
56         int probe_index) :
57         Signal(name),
58         _data(data),
59         _probe_index(probe_index)
60 {
61         assert(_probe_index >= 0);
62 }
63
64 void LogicSignal::paint(QGLWidget &widget, const QRect &rect,
65         double scale, double offset)
66 {
67         Point2F *vertex;
68
69         vector< pair<int64_t, bool> > edges;
70
71         assert(scale > 0);
72         assert(_data);
73
74         const float high_offset = rect.top() + Margin;
75         const float low_offset = rect.bottom() - Margin;
76
77         const deque< shared_ptr<LogicDataSnapshot> > &snapshots =
78                 _data->get_snapshots();
79         if(snapshots.empty())
80                 return;
81
82         const shared_ptr<LogicDataSnapshot> &snapshot = snapshots.front();
83
84         const double pixels_offset = offset / scale;
85         const double samplerate = _data->get_samplerate();
86         const double start_time = _data->get_start_time();
87         const int64_t last_sample = snapshot->get_sample_count() - 1;
88         const double samples_per_pixel = samplerate * scale;
89         const double start = samplerate * (offset - start_time);
90         const double end = start + samples_per_pixel * rect.width();
91
92         snapshot->get_subsampled_edges(edges,
93                 min(max((int64_t)floor(start), (int64_t)0), last_sample),
94                 min(max((int64_t)ceil(end), (int64_t)0), last_sample),
95                 samples_per_pixel, _probe_index);
96
97         // Paint the edges
98         const unsigned int edge_point_count = (edges.size() - 2) * 2;
99         Point2F *const edge_points = new Point2F[edge_point_count];
100         vertex = edge_points;
101
102         for(vector<LogicDataSnapshot::EdgePair>::const_iterator i = edges.begin() + 1;
103             i != edges.end() - 1; i++)
104         {
105                 const int x = (int)((*i).first / samples_per_pixel - pixels_offset) +
106                         rect.left();
107
108                 vertex->x = x, vertex->y = high_offset;
109                 vertex++;
110                 vertex->x = x, vertex->y = low_offset;
111                 vertex++;
112         }
113
114         glColor3fv(EdgeColour);
115         paint_lines(edge_points, edge_point_count);
116         delete[] edge_points;
117
118         // Paint the caps
119         const unsigned int max_cap_point_count = (edges.size() - 1) * 2;
120         Point2F *const cap_points = new Point2F[max_cap_point_count];
121
122         glColor3fv(HighColour);
123         paint_caps(cap_points, edges, true, samples_per_pixel,
124                 pixels_offset, rect.left(), high_offset);
125         glColor3fv(LowColour);
126         paint_caps(cap_points, edges, false, samples_per_pixel,
127                 pixels_offset, rect.left(), low_offset);
128
129         delete[] cap_points;
130 }
131
132 int LogicSignal::paint_caps(Point2F *const cap_points,
133         vector< pair<int64_t, bool> > &edges, bool level,
134         double samples_per_pixel, double pixels_offset, int x_offset,
135         int y_offset)
136 {
137         Point2F *vertex = cap_points;
138
139         for(vector<LogicDataSnapshot::EdgePair>::const_iterator i = edges.begin();
140             i != (edges.end() - 1); i++)
141                 if((*i).second == level)
142                 {
143                         vertex->x = (int)((*i).first / samples_per_pixel -
144                                 pixels_offset) + x_offset - 1;
145                         vertex->y = y_offset;
146                         vertex++;
147
148                         vertex->x = (int)((*(i+1)).first / samples_per_pixel -
149                                 pixels_offset) + x_offset;
150                         vertex->y = y_offset;
151                         vertex++;
152                 }
153
154         paint_lines(cap_points, vertex - cap_points);
155 }
156
157 void LogicSignal::paint_lines(Point2F *points, int count)
158 {
159         GLuint vbo_id;
160
161         assert(points);
162
163         glGenBuffers(1, &vbo_id);
164         glBindBuffer(GL_ARRAY_BUFFER, vbo_id);
165
166         const unsigned int vbo_length = count * sizeof(Point2F);
167         glBufferData(GL_ARRAY_BUFFER, vbo_length, NULL, GL_STATIC_DRAW);
168         glBufferSubData(GL_ARRAY_BUFFER, 0, vbo_length, points);
169
170         glBindBuffer(GL_ARRAY_BUFFER, vbo_id);
171
172         glVertexPointer(2, GL_FLOAT, sizeof(Point2F), 0);
173
174         glEnableClientState(GL_VERTEX_ARRAY);
175         glDrawArrays(GL_LINES,  0,  count);
176         glDisableClientState(GL_VERTEX_ARRAY);
177
178         glDeleteBuffers(1, &vbo_id);
179 }
180
181 QColor LogicSignal::get_colour() const
182 {
183         return LogicSignalColours[_probe_index % countof(LogicSignalColours)];
184 }
185
186 int LogicSignal::get_nominal_offset(const QRect &rect) const
187 {
188         return rect.bottom() - Margin;
189 }