X-Git-Url: https://sigrok.org/gitweb/?p=pulseview.git;a=blobdiff_plain;f=logicsignal.cpp;h=67d72bef8b7c741190cad954f84fddd9f42103ed;hp=48a9570157c083b2c928b6a30b7abfffdf1c4d6e;hb=e5335d4f0973a90ef7f7f69095e9db36e3feb0cb;hpb=28a4c9c5eb20296199fc3496bb40b7733dffac75

diff --git a/logicsignal.cpp b/logicsignal.cpp
index 48a95701..67d72bef 100644
--- a/logicsignal.cpp
+++ b/logicsignal.cpp
@@ -18,12 +18,151 @@
  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
  */
 
+#define GL_GLEXT_PROTOTYPES
+#include <GL/gl.h>
+#include <GL/glext.h>
+
+#include <math.h>
+
+#include "logicdata.h"
+#include "logicdatasnapshot.h"
 #include "logicsignal.h"
 
-LogicSignal::LogicSignal(QString name, boost::shared_ptr<SignalData> data,
+using namespace boost;
+using namespace std;
+
+const float Log2 = logf(2.0f);
+
+const float LogicSignal::Margin = 10.0f;
+
+const float LogicSignal::EdgeColour[3] =	{0.50f, 0.50f, 0.50f};
+const float LogicSignal::HighColour[3] =	{0.00f, 0.75f, 0.00f};
+const float LogicSignal::LowColour[3] =	{0.75f, 0.00f, 0.00f};
+
+LogicSignal::LogicSignal(QString name, shared_ptr<LogicData> data,
 	int probe_index) :
-	Signal(name, data),
+	Signal(name),
+	_data(data),
 	_probe_index(probe_index)
 {
 	assert(_probe_index >= 0);
 }
+
+void LogicSignal::paint(QGLWidget &widget, const QRect &rect,
+	double scale, double offset)
+{
+	Point2F *vertex;
+
+	vector< pair<int64_t, bool> > edges;
+
+	assert(scale > 0);
+	assert(_data);
+
+	const float high_offset = rect.top() + Margin;
+	const float low_offset = rect.bottom() - Margin;
+
+	const queue< shared_ptr<LogicDataSnapshot> > &snapshots =
+		_data->get_snapshots();
+	if(snapshots.empty())
+		return;
+
+	const shared_ptr<LogicDataSnapshot> &snapshot = snapshots.front();
+
+	const double pixels_offset = offset / scale;
+	const double samplerate = _data->get_samplerate();
+	const double start_time = _data->get_start_time();
+	const int64_t last_sample = (int64_t)snapshot->get_sample_count() - 1;
+	const double samples_per_pixel = samplerate * scale;
+	const int64_t start = min(max((int64_t)(samplerate * (offset - start_time)),
+		(int64_t)0), last_sample);
+	const int64_t end = min((int64_t)(start + samples_per_pixel * rect.width()),
+		last_sample);
+	const int64_t quantization_length = 1LL << (int64_t)floorf(
+		max(logf(samples_per_pixel / Log2), 0.0f));
+
+	snapshot->get_subsampled_edges(edges, start, end,
+		quantization_length, _probe_index);
+
+	// Paint the edges
+	const unsigned int edge_point_count = (edges.size() - 2) * 2;
+	Point2F *const edge_points = new Point2F[edge_point_count];
+	vertex = edge_points;
+
+	for(vector<LogicDataSnapshot::EdgePair>::const_iterator i = edges.begin() + 1;
+	    i != edges.end() - 1; i++)
+	{
+		const int x = (int)((*i).first / samples_per_pixel - pixels_offset) +
+			rect.left();
+
+		vertex->x = x, vertex->y = high_offset;
+		vertex++;
+		vertex->x = x, vertex->y = low_offset;
+		vertex++;
+	}
+
+	glColor3fv(EdgeColour);
+	paint_lines(edge_points, edge_point_count);
+	delete[] edge_points;
+
+	// Paint the caps
+	const unsigned int max_cap_point_count = (edges.size() - 1) * 2;
+	Point2F *const cap_points = new Point2F[max_cap_point_count];
+
+	glColor3fv(HighColour);
+	paint_caps(cap_points, edges, true, samples_per_pixel,
+		pixels_offset, rect.left(), high_offset);
+	glColor3fv(LowColour);
+	paint_caps(cap_points, edges, false, samples_per_pixel,
+		pixels_offset, rect.left(), low_offset);
+
+	delete[] cap_points;
+}
+
+int LogicSignal::paint_caps(Point2F *const cap_points,
+	vector< pair<int64_t, bool> > &edges, bool level,
+	double samples_per_pixel, double pixels_offset, int x_offset,
+	int y_offset)
+{
+	Point2F *vertex = cap_points;
+
+	for(vector<LogicDataSnapshot::EdgePair>::const_iterator i = edges.begin();
+	    i != (edges.end() - 1); i++)
+		if((*i).second == level)
+		{
+			vertex->x = (int)((*i).first / samples_per_pixel -
+				pixels_offset) + x_offset - 1;
+			vertex->y = y_offset;
+			vertex++;
+
+			vertex->x = (int)((*(i+1)).first / samples_per_pixel -
+				pixels_offset) + x_offset;
+			vertex->y = y_offset;
+			vertex++;
+		}
+
+	paint_lines(cap_points, vertex - cap_points);
+}
+
+void LogicSignal::paint_lines(Point2F *points, int count)
+{
+	GLuint vbo_id;
+
+	assert(points);
+
+	glGenBuffers(1, &vbo_id);
+	glBindBuffer(GL_ARRAY_BUFFER, vbo_id);
+
+	const unsigned int vbo_length = count * sizeof(Point2F);
+	glBufferData(GL_ARRAY_BUFFER, vbo_length, NULL, GL_STATIC_DRAW);
+	glBufferSubData(GL_ARRAY_BUFFER, 0, vbo_length, points);
+
+	glBindBuffer(GL_ARRAY_BUFFER, vbo_id);
+
+	glVertexPointer(2, GL_FLOAT, sizeof(Point2F), 0);
+
+	glEnableClientState(GL_VERTEX_ARRAY);
+	glDrawArrays(GL_LINES,  0,  count);
+	glDisableClientState(GL_VERTEX_ARRAY);
+
+	glDeleteBuffers(1, &vbo_id);
+}