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 }