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 "logicdata.h"
  26 #include "logicdatasnapshot.h"
  27 #include "logicsignal.h"
  28
  29 using namespace boost;
  30 using namespace std;
  31
  32 LogicSignal::LogicSignal(QString name, shared_ptr<LogicData> data,
  33         int probe_index) :
  34         Signal(name),
  35         _data(data),
  36         _probe_index(probe_index)
  37 {
  38         assert(_probe_index >= 0);
  39 }
  40
  41 void LogicSignal::paint(QGLWidget &widget, const QRect &rect,
  42         uint64_t scale, int64_t offset)
  43 {
  44         Point2F *vertex;
  45
  46         vector< pair<int64_t, bool> > edges;
  47
  48         assert(_data);
  49
  50         const queue< shared_ptr<LogicDataSnapshot> > &snapshots =
  51                 _data->get_snapshots();
  52         if(snapshots.empty())
  53                 return;
  54
  55         const shared_ptr<LogicDataSnapshot> &snapshot = snapshots.front();
  56
  57         const int64_t start = 0;
  58         const int64_t end = 8000;
  59         const int64_t quantization_length = 4;
  60
  61         snapshot->get_subsampled_edges(edges, start, end,
  62                 quantization_length, _probe_index);
  63
  64         // Paint the edges
  65         const unsigned int edge_point_count = (edges.size() - 2) * 2;
  66         Point2F *const edge_points = new Point2F[edge_point_count];
  67         vertex = edge_points;
  68
  69         for(vector<LogicDataSnapshot::EdgePair>::const_iterator i = edges.begin() + 1;
  70             i != edges.end() - 1; i++)
  71         {
  72                 const int x = edge.first / quantization_length +
  73                         rect.left();
  74
  75                 vertex->x = x, vertex->y = 10 + rect.top() - 1;
  76                 vertex++;
  77                 vertex->x = x, vertex->y = 40 + rect.top();
  78                 vertex++;
  79         }
  80
  81         glColor3f(0,0,1);
  82         paint_lines(edge_points, edge_point_count);
  83         delete[] edge_points;
  84
  85         // Paint the caps
  86         const unsigned int cap_point_count = (edges.size() - 1) * 2;
  87         Point2F *const cap_points = new Point2F[cap_point_count];
  88         vertex = cap_points;
  89
  90         for(vector<LogicDataSnapshot::EdgePair>::const_iterator i = edges.begin();
  91             i != (edges.end() - 1); i++)
  92         {
  93                 const int y = ((*i).second ? 10 : 40) + rect.top();
  94
  95                 vertex->x = (*i).first / quantization_length +
  96                         rect.left() - 1;
  97                 vertex->y = y;
  98                 vertex++;
  99
 100                 vertex->x = (*(i+1)).first / quantization_length +
 101                         rect.left();
 102                 vertex->y = y;
 103                 vertex++;
 104         }
 105
 106         glColor3f(0,0,1);
 107         paint_lines(cap_points, cap_point_count);
 108         delete[] cap_points;
 109 }
 110
 111 void LogicSignal::paint_lines(Point2F *points, int count)
 112 {
 113         GLuint vbo_id;
 114
 115         assert(points);
 116
 117         glGenBuffers(1, &vbo_id);
 118         glBindBuffer(GL_ARRAY_BUFFER, vbo_id);
 119
 120         const unsigned int vbo_length = count * sizeof(Point2F);
 121         glBufferData(GL_ARRAY_BUFFER, vbo_length, NULL, GL_STATIC_DRAW);
 122         glBufferSubData(GL_ARRAY_BUFFER, 0, vbo_length, points);
 123
 124         glBindBuffer(GL_ARRAY_BUFFER, vbo_id);
 125
 126         glVertexPointer(2, GL_FLOAT, sizeof(Point2F), 0);
 127
 128         glEnableClientState(GL_VERTEX_ARRAY);
 129         glDrawArrays(GL_LINES,  0,  count);
 130         glDisableClientState(GL_VERTEX_ARRAY);
 131
 132         glDeleteBuffers(1, &vbo_id);
 133 }