1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
|
#include "waveform/renderers/allshader/waveformrenderbeat.h"
#include <QDomNode>
#include "control/controlobject.h"
#include "skin/legacy/skincontext.h"
#include "track/track.h"
#include "waveform/renderers/allshader/matrixforwidgetgeometry.h"
#include "waveform/widgets/allshader/waveformwidget.h"
#include "widget/wskincolor.h"
#include "widget/wwidget.h"
using namespace allshader;
WaveformRenderBeat::WaveformRenderBeat(WaveformWidgetRenderer* waveformWidget)
: WaveformRenderer(waveformWidget) {
}
WaveformRenderBeat::~WaveformRenderBeat() {
}
void WaveformRenderBeat::initializeGL() {
WaveformRenderer::initializeGL();
m_shader.init();
}
void WaveformRenderBeat::setup(const QDomNode& node, const SkinContext& context) {
m_color.setNamedColor(context.selectString(node, "BeatColor"));
m_color = WSkinColor::getCorrectColor(m_color).toRgb();
}
void WaveformRenderBeat::paintGL() {
TrackPointer trackInfo = m_waveformRenderer->getTrackInfo();
if (!trackInfo) {
return;
}
mixxx::BeatsPointer trackBeats = trackInfo->getBeats();
if (!trackBeats) {
return;
}
int alpha = m_waveformRenderer->getBeatGridAlpha();
if (alpha == 0) {
return;
}
glEnable(GL_BLEND);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
m_color.setAlphaF(alpha / 100.0);
const int trackSamples = m_waveformRenderer->getTrackSamples();
if (trackSamples <= 0) {
return;
}
const double firstDisplayedPosition =
m_waveformRenderer->getFirstDisplayedPosition();
const double lastDisplayedPosition =
m_waveformRenderer->getLastDisplayedPosition();
const auto startPosition = mixxx::audio::FramePos::fromEngineSamplePos(
firstDisplayedPosition * trackSamples);
const auto endPosition = mixxx::audio::FramePos::fromEngineSamplePos(
lastDisplayedPosition * trackSamples);
if (!startPosition.isValid() || !endPosition.isValid()) {
return;
}
const float rendererBreadth = m_waveformRenderer->getBreadth();
const int numVerticesPerLine = 6; // 2 triangles
// Count the number of beats in the range to reserve space in the m_vertices vector.
// Note that we could also use
// int numBearsInRange = trackBeats->numBeatsInRange(startPosition, endPosition);
// for this, but there have been reports of that method failing with a DEBUG_ASSERT.
int numBeatsInRange = 0;
for (auto it = trackBeats->iteratorFrom(startPosition);
it != trackBeats->cend() && *it <= endPosition;
++it) {
numBeatsInRange++;
}
const int reserved = numBeatsInRange * numVerticesPerLine;
m_vertices.clear();
m_vertices.reserve(reserved);
for (auto it = trackBeats->iteratorFrom(startPosition);
it != trackBeats->cend() && *it <= endPosition;
++it) {
double beatPosition = it->toEngineSamplePos();
double xBeatPoint =
m_waveformRenderer->transformSamplePositionInRendererWorld(beatPosition);
xBeatPoint = std::floor(xBeatPoint);
xBeatPoint -= 0.5;
const float x1 = static_cast<float>(xBeatPoint);
const float x2 = x1 + 1.f;
m_vertices.addRectangle(x1, 0.f, x2, rendererBreadth);
}
DEBUG_ASSERT(reserved == m_vertices.size());
const int vertexLocation = m_shader.attributeLocation("position");
const int matrixLocation = m_shader.uniformLocation("matrix");
const int colorLocation = m_shader.uniformLocation("color");
m_shader.bind();
m_shader.enableAttributeArray(vertexLocation);
const QMatrix4x4 matrix = matrixForWidgetGeometry(m_waveformRenderer, false);
m_shader.setAttributeArray(
vertexLocation, GL_FLOAT, m_vertices.constData(), 2);
m_shader.setUniformValue(matrixLocation, matrix);
m_shader.setUniformValue(colorLocation, m_color);
glDrawArrays(GL_TRIANGLES, 0, m_vertices.size());
m_shader.disableAttributeArray(vertexLocation);
m_shader.release();
}
|
