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#include "widget/wvumeterglsl.h"
#include "util/assert.h"
#include "util/math.h"
#include "util/texture.h"
WVuMeterGLSL::WVuMeterGLSL(QWidget* pParent)
: WVuMeterBase(pParent) {
}
WVuMeterGLSL::~WVuMeterGLSL() {
cleanupGL();
}
void WVuMeterGLSL::draw() {
if (shouldRender()) {
makeCurrentIfNeeded();
paintGL();
doneCurrent();
}
}
void WVuMeterGLSL::initializeGL() {
m_pTextureBack.reset(createTexture(m_pPixmapBack));
m_pTextureVu.reset(createTexture(m_pPixmapVu));
m_textureShader.init();
}
void WVuMeterGLSL::paintGL() {
glClearColor(static_cast<float>(m_qBgColor.redF()),
static_cast<float>(m_qBgColor.greenF()),
static_cast<float>(m_qBgColor.blueF()),
1.f);
glClear(GL_COLOR_BUFFER_BIT);
glDisable(GL_DEPTH_TEST);
glEnable(GL_BLEND);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
QMatrix4x4 matrix;
matrix.ortho(QRectF(0, 0, width(), height()));
m_textureShader.bind();
int matrixLocation = m_textureShader.matrixLocation();
int samplerLocation = m_textureShader.samplerLocation();
int positionLocation = m_textureShader.positionLocation();
int texcoordLocation = m_textureShader.texcoordLocation();
m_textureShader.setUniformValue(matrixLocation, matrix);
m_textureShader.setUniformValue(matrixLocation, matrix);
m_textureShader.enableAttributeArray(positionLocation);
m_textureShader.enableAttributeArray(texcoordLocation);
m_textureShader.setUniformValue(samplerLocation, 0);
if (m_pTextureBack) {
QRectF sourceRect(0, 0, m_pPixmapBack->width(), m_pPixmapBack->height());
drawTexture(m_pTextureBack.get(), rect(), sourceRect);
}
const double widgetWidth = width();
const double widgetHeight = height();
if (m_pTextureVu) {
const double pixmapWidth = m_pTextureVu->width();
const double pixmapHeight = m_pTextureVu->height();
if (m_bHorizontal) {
const double widgetPosition = math_clamp(widgetWidth * m_dParameter, 0.0, widgetWidth);
QRectF targetRect(0, 0, widgetPosition, widgetHeight);
const double pixmapPosition = math_clamp(
pixmapWidth * m_dParameter, 0.0, pixmapWidth);
QRectF sourceRect(0, 0, pixmapPosition, pixmapHeight);
drawTexture(m_pTextureVu.get(), targetRect, sourceRect);
if (m_iPeakHoldSize > 0 && m_dPeakParameter > 0.0 &&
m_dPeakParameter > m_dParameter) {
const double widgetPeakPosition = math_clamp(
widgetWidth * m_dPeakParameter, 0.0, widgetWidth);
const double pixmapPeakHoldSize = static_cast<double>(m_iPeakHoldSize);
const double widgetPeakHoldSize = widgetWidth * pixmapPeakHoldSize / pixmapWidth;
QRectF targetRect(widgetPeakPosition - widgetPeakHoldSize,
0,
widgetPeakHoldSize,
widgetHeight);
const double pixmapPeakPosition = math_clamp(
pixmapWidth * m_dPeakParameter, 0.0, pixmapWidth);
QRectF sourceRect =
QRectF(pixmapPeakPosition - pixmapPeakHoldSize,
0,
pixmapPeakHoldSize,
pixmapHeight);
drawTexture(m_pTextureVu.get(), targetRect, sourceRect);
}
} else {
// vertical
const double widgetPosition =
math_clamp(widgetHeight * m_dParameter, 0.0, widgetHeight);
QRectF targetRect(0, widgetHeight - widgetPosition, widgetWidth, widgetPosition);
const double pixmapPosition = math_clamp(
pixmapHeight * m_dParameter, 0.0, pixmapHeight);
QRectF sourceRect(0, pixmapHeight - pixmapPosition, pixmapWidth, pixmapPosition);
drawTexture(m_pTextureVu.get(), targetRect, sourceRect);
if (m_iPeakHoldSize > 0 && m_dPeakParameter > 0.0 &&
m_dPeakParameter > m_dParameter) {
const double widgetPeakPosition = math_clamp(
widgetHeight * m_dPeakParameter, 0.0, widgetHeight);
const double pixmapPeakHoldSize = static_cast<double>(m_iPeakHoldSize);
const double widgetPeakHoldSize = widgetHeight * pixmapPeakHoldSize / pixmapHeight;
QRectF targetRect(0,
widgetHeight - widgetPeakPosition,
widgetWidth,
widgetPeakHoldSize);
const double pixmapPeakPosition = math_clamp(
pixmapHeight * m_dPeakParameter, 0.0, pixmapHeight);
QRectF sourceRect = QRectF(0,
pixmapHeight - pixmapPeakPosition,
pixmapWidth,
pixmapPeakHoldSize);
drawTexture(m_pTextureVu.get(), targetRect, sourceRect);
}
}
}
m_textureShader.disableAttributeArray(positionLocation);
m_textureShader.disableAttributeArray(texcoordLocation);
m_textureShader.release();
}
void WVuMeterGLSL::cleanupGL() {
makeCurrentIfNeeded();
m_pTextureBack.reset();
m_pTextureVu.reset();
doneCurrent();
}
void WVuMeterGLSL::drawTexture(QOpenGLTexture* texture,
const QRectF& targetRect,
const QRectF& sourceRect) {
const float texx1 = static_cast<float>(sourceRect.x() / texture->width());
const float texy1 = static_cast<float>(sourceRect.y() / texture->height());
const float texx2 = static_cast<float>(
(sourceRect.x() + sourceRect.width()) / texture->width());
const float texy2 = static_cast<float>(
(sourceRect.y() + sourceRect.height()) / texture->height());
const float posx1 = static_cast<float>(targetRect.x());
const float posy1 = static_cast<float>(targetRect.y());
const float posx2 = static_cast<float>(targetRect.x() + targetRect.width());
const float posy2 = static_cast<float>(targetRect.y() + targetRect.height());
const float posarray[] = {posx1, posy1, posx2, posy1, posx1, posy2, posx2, posy2};
const float texarray[] = {texx1, texy1, texx2, texy1, texx1, texy2, texx2, texy2};
int positionLocation = m_textureShader.positionLocation();
int texcoordLocation = m_textureShader.texcoordLocation();
m_textureShader.setAttributeArray(
positionLocation, GL_FLOAT, posarray, 2);
m_textureShader.setAttributeArray(
texcoordLocation, GL_FLOAT, texarray, 2);
texture->bind();
glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
texture->release();
}
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