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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 Log2 = logf(2.0f); | |
37 | ||
38 | const float LogicSignal::Margin = 10.0f; | |
39 | ||
40 | const float LogicSignal::EdgeColour[3] = {0.50f, 0.50f, 0.50f}; | |
41 | const float LogicSignal::HighColour[3] = {0.00f, 0.75f, 0.00f}; | |
42 | const float LogicSignal::LowColour[3] = {0.75f, 0.00f, 0.00f}; | |
43 | ||
44 | const QColor LogicSignal::LogicSignalColours[10] = { | |
45 | QColor(0x16, 0x19, 0x1A), // Black | |
46 | QColor(0x8F, 0x52, 0x02), // Brown | |
47 | QColor(0xCC, 0x00, 0x00), // Red | |
48 | QColor(0xF5, 0x79, 0x00), // Orange | |
49 | QColor(0xED, 0xD4, 0x00), // Yellow | |
50 | QColor(0x73, 0xD2, 0x16), // Green | |
51 | QColor(0x34, 0x65, 0xA4), // Blue | |
52 | QColor(0x75, 0x50, 0x7B), // Violet | |
53 | QColor(0x88, 0x8A, 0x85), // Grey | |
54 | QColor(0xEE, 0xEE, 0xEC), // White | |
55 | }; | |
56 | ||
57 | LogicSignal::LogicSignal(QString name, shared_ptr<LogicData> data, | |
58 | int probe_index) : | |
59 | Signal(name), | |
60 | _data(data), | |
61 | _probe_index(probe_index) | |
62 | { | |
63 | assert(_probe_index >= 0); | |
64 | } | |
65 | ||
66 | void LogicSignal::paint(QGLWidget &widget, const QRect &rect, | |
67 | double scale, double offset) | |
68 | { | |
69 | Point2F *vertex; | |
70 | ||
71 | vector< pair<int64_t, bool> > edges; | |
72 | ||
73 | assert(scale > 0); | |
74 | assert(_data); | |
75 | ||
76 | const float high_offset = rect.top() + Margin; | |
77 | const float low_offset = rect.bottom() - Margin; | |
78 | ||
79 | const queue< shared_ptr<LogicDataSnapshot> > &snapshots = | |
80 | _data->get_snapshots(); | |
81 | if(snapshots.empty()) | |
82 | return; | |
83 | ||
84 | const shared_ptr<LogicDataSnapshot> &snapshot = snapshots.front(); | |
85 | ||
86 | const double pixels_offset = offset / scale; | |
87 | const double samplerate = _data->get_samplerate(); | |
88 | const double start_time = _data->get_start_time(); | |
89 | const int64_t last_sample = snapshot->get_sample_count() - 1; | |
90 | const double samples_per_pixel = samplerate * scale; | |
91 | const double start = samplerate * (offset - start_time); | |
92 | const double end = start + samples_per_pixel * rect.width(); | |
93 | const int64_t quantization_length = 1LL << (int64_t)floorf( | |
94 | max(logf((float)samples_per_pixel) / Log2, 0.0f)); | |
95 | ||
96 | snapshot->get_subsampled_edges(edges, | |
97 | min(max((int64_t)floor(start), (int64_t)0), last_sample), | |
98 | min(max((int64_t)ceil(end), (int64_t)0), last_sample), | |
99 | quantization_length, _probe_index); | |
100 | ||
101 | // Paint the edges | |
102 | const unsigned int edge_point_count = (edges.size() - 2) * 2; | |
103 | Point2F *const edge_points = new Point2F[edge_point_count]; | |
104 | vertex = edge_points; | |
105 | ||
106 | for(vector<LogicDataSnapshot::EdgePair>::const_iterator i = edges.begin() + 1; | |
107 | i != edges.end() - 1; i++) | |
108 | { | |
109 | const int x = (int)((*i).first / samples_per_pixel - pixels_offset) + | |
110 | rect.left(); | |
111 | ||
112 | vertex->x = x, vertex->y = high_offset; | |
113 | vertex++; | |
114 | vertex->x = x, vertex->y = low_offset; | |
115 | vertex++; | |
116 | } | |
117 | ||
118 | glColor3fv(EdgeColour); | |
119 | paint_lines(edge_points, edge_point_count); | |
120 | delete[] edge_points; | |
121 | ||
122 | // Paint the caps | |
123 | const unsigned int max_cap_point_count = (edges.size() - 1) * 2; | |
124 | Point2F *const cap_points = new Point2F[max_cap_point_count]; | |
125 | ||
126 | glColor3fv(HighColour); | |
127 | paint_caps(cap_points, edges, true, samples_per_pixel, | |
128 | pixels_offset, rect.left(), high_offset); | |
129 | glColor3fv(LowColour); | |
130 | paint_caps(cap_points, edges, false, samples_per_pixel, | |
131 | pixels_offset, rect.left(), low_offset); | |
132 | ||
133 | delete[] cap_points; | |
134 | } | |
135 | ||
136 | int LogicSignal::paint_caps(Point2F *const cap_points, | |
137 | vector< pair<int64_t, bool> > &edges, bool level, | |
138 | double samples_per_pixel, double pixels_offset, int x_offset, | |
139 | int y_offset) | |
140 | { | |
141 | Point2F *vertex = cap_points; | |
142 | ||
143 | for(vector<LogicDataSnapshot::EdgePair>::const_iterator i = edges.begin(); | |
144 | i != (edges.end() - 1); i++) | |
145 | if((*i).second == level) | |
146 | { | |
147 | vertex->x = (int)((*i).first / samples_per_pixel - | |
148 | pixels_offset) + x_offset - 1; | |
149 | vertex->y = y_offset; | |
150 | vertex++; | |
151 | ||
152 | vertex->x = (int)((*(i+1)).first / samples_per_pixel - | |
153 | pixels_offset) + x_offset; | |
154 | vertex->y = y_offset; | |
155 | vertex++; | |
156 | } | |
157 | ||
158 | paint_lines(cap_points, vertex - cap_points); | |
159 | } | |
160 | ||
161 | void LogicSignal::paint_lines(Point2F *points, int count) | |
162 | { | |
163 | GLuint vbo_id; | |
164 | ||
165 | assert(points); | |
166 | ||
167 | glGenBuffers(1, &vbo_id); | |
168 | glBindBuffer(GL_ARRAY_BUFFER, vbo_id); | |
169 | ||
170 | const unsigned int vbo_length = count * sizeof(Point2F); | |
171 | glBufferData(GL_ARRAY_BUFFER, vbo_length, NULL, GL_STATIC_DRAW); | |
172 | glBufferSubData(GL_ARRAY_BUFFER, 0, vbo_length, points); | |
173 | ||
174 | glBindBuffer(GL_ARRAY_BUFFER, vbo_id); | |
175 | ||
176 | glVertexPointer(2, GL_FLOAT, sizeof(Point2F), 0); | |
177 | ||
178 | glEnableClientState(GL_VERTEX_ARRAY); | |
179 | glDrawArrays(GL_LINES, 0, count); | |
180 | glDisableClientState(GL_VERTEX_ARRAY); | |
181 | ||
182 | glDeleteBuffers(1, &vbo_id); | |
183 | } | |
184 | ||
185 | QColor LogicSignal::get_colour() const | |
186 | { | |
187 | return LogicSignalColours[_probe_index % countof(LogicSignalColours)]; | |
188 | } | |
189 | ||
190 | int LogicSignal::get_nominal_offset(const QRect &rect) const | |
191 | { | |
192 | return rect.bottom() - Margin; | |
193 | } |