1 files changed, 108 insertions, 0 deletions
diff --git a/src/apps/qcam/viewfinder_gl.h b/src/apps/qcam/viewfinder_gl.h
new file mode 100644
index 00000000..68c2912d
--- /dev/null
+++ b/src/apps/qcam/viewfinder_gl.h
@@ -0,0 +1,108 @@
+/* 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_ */
+};