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28a4c9c5 JH |
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 | ||
81a635d1 JH |
21 | #define GL_GLEXT_PROTOTYPES |
22 | #include <GL/gl.h> | |
23 | #include <GL/glext.h> | |
24 | ||
7cd5faf8 JH |
25 | #include <math.h> |
26 | ||
2858b391 JH |
27 | #include "logicdata.h" |
28 | #include "logicdatasnapshot.h" | |
28a4c9c5 JH |
29 | #include "logicsignal.h" |
30 | ||
2858b391 JH |
31 | using namespace boost; |
32 | using namespace std; | |
81a635d1 | 33 | |
7cd5faf8 JH |
34 | const float Log2 = logf(2.0f); |
35 | ||
2858b391 | 36 | LogicSignal::LogicSignal(QString name, shared_ptr<LogicData> data, |
28a4c9c5 | 37 | int probe_index) : |
2858b391 JH |
38 | Signal(name), |
39 | _data(data), | |
28a4c9c5 JH |
40 | _probe_index(probe_index) |
41 | { | |
42 | assert(_probe_index >= 0); | |
43 | } | |
e3f65ace | 44 | |
3b18c57d | 45 | void LogicSignal::paint(QGLWidget &widget, const QRect &rect, |
fb0d32cb | 46 | double scale, double offset) |
e3f65ace | 47 | { |
2858b391 JH |
48 | Point2F *vertex; |
49 | ||
50 | vector< pair<int64_t, bool> > edges; | |
51 | ||
fb0d32cb | 52 | assert(scale > 0); |
2858b391 JH |
53 | assert(_data); |
54 | ||
55 | const queue< shared_ptr<LogicDataSnapshot> > &snapshots = | |
56 | _data->get_snapshots(); | |
57 | if(snapshots.empty()) | |
58 | return; | |
59 | ||
60 | const shared_ptr<LogicDataSnapshot> &snapshot = snapshots.front(); | |
61 | ||
fb0d32cb JH |
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()), | |
70 | last_sample); | |
7cd5faf8 JH |
71 | const int64_t quantization_length = 1LL << (int64_t)floorf( |
72 | max(logf(samples_per_pixel / Log2), 0.0f)); | |
2858b391 JH |
73 | |
74 | snapshot->get_subsampled_edges(edges, start, end, | |
75 | quantization_length, _probe_index); | |
76 | ||
77 | // Paint the edges | |
78 | const unsigned int edge_point_count = (edges.size() - 2) * 2; | |
79 | Point2F *const edge_points = new Point2F[edge_point_count]; | |
80 | vertex = edge_points; | |
81 | ||
82 | for(vector<LogicDataSnapshot::EdgePair>::const_iterator i = edges.begin() + 1; | |
83 | i != edges.end() - 1; i++) | |
84 | { | |
fb0d32cb | 85 | const int x = (int)((*i).first / samples_per_pixel - pixels_offset) + |
2858b391 JH |
86 | rect.left(); |
87 | ||
88 | vertex->x = x, vertex->y = 10 + rect.top() - 1; | |
89 | vertex++; | |
90 | vertex->x = x, vertex->y = 40 + rect.top(); | |
91 | vertex++; | |
92 | } | |
81a635d1 JH |
93 | |
94 | glColor3f(0,0,1); | |
2858b391 JH |
95 | paint_lines(edge_points, edge_point_count); |
96 | delete[] edge_points; | |
97 | ||
98 | // Paint the caps | |
99 | const unsigned int cap_point_count = (edges.size() - 1) * 2; | |
100 | Point2F *const cap_points = new Point2F[cap_point_count]; | |
101 | vertex = cap_points; | |
102 | ||
103 | for(vector<LogicDataSnapshot::EdgePair>::const_iterator i = edges.begin(); | |
104 | i != (edges.end() - 1); i++) | |
105 | { | |
106 | const int y = ((*i).second ? 10 : 40) + rect.top(); | |
107 | ||
fb0d32cb | 108 | vertex->x = (int)((*i).first / samples_per_pixel - pixels_offset) + |
2858b391 JH |
109 | rect.left() - 1; |
110 | vertex->y = y; | |
111 | vertex++; | |
112 | ||
fb0d32cb | 113 | vertex->x = (int)((*(i+1)).first / samples_per_pixel - pixels_offset) + |
2858b391 JH |
114 | rect.left(); |
115 | vertex->y = y; | |
116 | vertex++; | |
117 | } | |
118 | ||
119 | glColor3f(0,0,1); | |
120 | paint_lines(cap_points, cap_point_count); | |
121 | delete[] cap_points; | |
122 | } | |
123 | ||
124 | void LogicSignal::paint_lines(Point2F *points, int count) | |
125 | { | |
126 | GLuint vbo_id; | |
127 | ||
128 | assert(points); | |
81a635d1 JH |
129 | |
130 | glGenBuffers(1, &vbo_id); | |
131 | glBindBuffer(GL_ARRAY_BUFFER, vbo_id); | |
132 | ||
2858b391 JH |
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); | |
81a635d1 JH |
136 | |
137 | glBindBuffer(GL_ARRAY_BUFFER, vbo_id); | |
138 | ||
2858b391 | 139 | glVertexPointer(2, GL_FLOAT, sizeof(Point2F), 0); |
81a635d1 JH |
140 | |
141 | glEnableClientState(GL_VERTEX_ARRAY); | |
2858b391 | 142 | glDrawArrays(GL_LINES, 0, count); |
81a635d1 | 143 | glDisableClientState(GL_VERTEX_ARRAY); |
2858b391 JH |
144 | |
145 | glDeleteBuffers(1, &vbo_id); | |
e3f65ace | 146 | } |