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-rw-r--r--src/qcam/viewfinder_gl.h96
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diff --git a/src/qcam/viewfinder_gl.h b/src/qcam/viewfinder_gl.h
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+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+/*
+ * Copyright (C) 2020, Linaro
+ *
+ * viewfinder_GL.h - OpenGL Viewfinder for rendering by OpenGL shader
+ *
+ */
+#ifndef __VIEWFINDER_GL_H__
+#define __VIEWFINDER_GL_H__
+
+#include <QImage>
+#include <QMutex>
+#include <QOpenGLBuffer>
+#include <QOpenGLFunctions>
+#include <QOpenGLShader>
+#include <QOpenGLShaderProgram>
+#include <QOpenGLTexture>
+#include <QOpenGLWidget>
+#include <QSize>
+
+#include <libcamera/buffer.h>
+#include <libcamera/formats.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) override;
+ void render(libcamera::FrameBuffer *buffer, MappedBuffer *map) 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 configureTexture(unsigned int id);
+ bool createFragmentShader();
+ bool createVertexShader();
+ void removeShader();
+ void doRender();
+
+ /* Captured image size, format and buffer */
+ libcamera::FrameBuffer *buffer_;
+ libcamera::PixelFormat format_;
+ QSize size_;
+ unsigned char *yuvData_;
+
+ /* OpenGL components for rendering */
+ QOpenGLShader *fragmentShader_;
+ QOpenGLShader *vertexShader_;
+ QOpenGLShaderProgram shaderProgram_;
+
+ /* Vertex buffer */
+ QOpenGLBuffer vertexBuffer_;
+
+ /* Fragment and Vertex shader file name */
+ QString fragmentShaderSrc_;
+ QString vertexShaderSrc_;
+
+ /* YUV texture planars and parameters */
+ GLuint id_u_;
+ GLuint id_v_;
+ GLuint id_y_;
+ GLuint textureUniformU_;
+ GLuint textureUniformV_;
+ GLuint textureUniformY_;
+ QOpenGLTexture textureU_;
+ QOpenGLTexture textureV_;
+ QOpenGLTexture textureY_;
+ unsigned int horzSubSample_;
+ unsigned int vertSubSample_;
+
+ QMutex mutex_; /* Prevent concurrent access to image_ */
+};
+
+#endif /* __VIEWFINDER_GL_H__ */

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