/* SPDX-License-Identifier: LGPL-2.1-or-later */ /* * Copyright (C) 2020, Linaro * * viewfinder_GL.h - OpenGL Viewfinder for rendering by OpenGL shader * */ #pragma once #include <array> #include <memory> #include <QImage> #include <QMutex> #include <QOpenGLBuffer> #include <QOpenGLFunctions> #include <QOpenGLShader> #include <QOpenGLShaderProgram> #include <QOpenGLTexture> #include <QOpenGLWidget> #include <QSize> #include <libcamera/formats.h> #include <libcamera/framebuffer.h> #include "viewfinder.h" class ViewFinderGL : public QOpenGLWidget, public ViewFinder, protected QOpenGLFunctions { Q_OBJECT public: ViewFinderGL(QWidget *parent = nullptr); ~ViewFinderGL(); const QList<libcamera::PixelFormat> &nativeFormats() const override; int setFormat(const libcamera::PixelFormat &format, const QSize &size, const libcamera::ColorSpace &colorSpace, unsigned int stride) override; void render(libcamera::FrameBuffer *buffer, Image *image) override; void stop() override; QImage getCurrentImage() override; Q_SIGNALS: void renderComplete(libcamera::FrameBuffer *buffer); protected: void initializeGL() override; void paintGL() override; void resizeGL(int w, int h) override; QSize sizeHint() const override; private: bool selectFormat(const libcamera::PixelFormat &format); void selectColorSpace(const libcamera::ColorSpace &colorSpace); void configureTexture(QOpenGLTexture &texture); bool createFragmentShader(); bool createVertexShader(); void removeShader(); void doRender(); /* Captured image size, format and buffer */ libcamera::FrameBuffer *buffer_; libcamera::PixelFormat format_; libcamera::ColorSpace colorSpace_; QSize size_; unsigned int stride_; Image *image_; /* Shaders */ QOpenGLShaderProgram shaderProgram_; std::unique_ptr<QOpenGLShader> vertexShader_; std::unique_ptr<QOpenGLShader> fragmentShader_; QString vertexShaderFile_; QString fragmentShaderFile_; QStringList fragmentShaderDefines_; /* Vertex buffer */ QOpenGLBuffer vertexBuffer_; /* Textures */ std::array<std::unique_ptr<QOpenGLTexture>, 3> textures_; /* Common texture parameters */ GLuint textureMinMagFilters_; /* YUV texture parameters */ GLuint textureUniformU_; GLuint textureUniformV_; GLuint textureUniformY_; GLuint textureUniformStep_; unsigned int horzSubSample_; unsigned int vertSubSample_; /* Raw Bayer texture parameters */ GLuint textureUniformSize_; GLuint textureUniformStrideFactor_; GLuint textureUniformBayerFirstRed_; QPointF firstRed_; QMutex mutex_; /* Prevent concurrent access to image_ */ };