Make the OpenGL renderer a plugin

By default the QRenderAspect will try to load this plugin

Change-Id: Ie55e207fb8e6d0b64f717bbb99699eb669eaa3f2
Task-number: QTBUG-61151
Reviewed-by: Mike Krus <mike.krus@kdab.com>

1 files changed, 234 insertions, 0 deletions

diff --git a/src/plugins/renderers/opengl/graphicshelpers/submissioncontext_p.h b/src/plugins/renderers/opengl/graphicshelpers/submissioncontext_p.h
new file mode 100644
index 000000000..16eca07ea
--- /dev/null
+++ b/src/plugins/renderers/opengl/graphicshelpers/submissioncontext_p.h
@@ -0,0 +1,234 @@
+/****************************************************************************
+**
+** Copyright (C) 2014 Klaralvdalens Datakonsult AB (KDAB).
+** Copyright (C) 2016 The Qt Company Ltd and/or its subsidiary(-ies).
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the Qt3D module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 3 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL3 included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 3 requirements
+** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 2.0 or (at your option) the GNU General
+** Public license version 3 or any later version approved by the KDE Free
+** Qt Foundation. The licenses are as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-2.0.html and
+** https://www.gnu.org/licenses/gpl-3.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QT3DRENDER_RENDER_SUBMISSIONCONTEXT_H
+#define QT3DRENDER_RENDER_SUBMISSIONCONTEXT_H
+
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt API.  It exists for the convenience
+// of other Qt classes.  This header file may change from version to
+// version without notice, or even be removed.
+//
+// We mean it.
+//
+
+
+#include <glbuffer_p.h>
+#include <glfence_p.h>
+#include <graphicscontext_p.h>
+#include <texturesubmissioncontext_p.h>
+#include <imagesubmissioncontext_p.h>
+#include <Qt3DRender/qclearbuffers.h>
+#include <Qt3DRender/qattribute.h>
+#include <Qt3DRender/private/handle_types_p.h>
+
+QT_BEGIN_NAMESPACE
+
+class QAbstractOpenGLFunctions;
+
+namespace Qt3DRender {
+
+namespace Render {
+
+class Renderer;
+class GraphicsHelperInterface;
+class RenderStateSet;
+class Material;
+class GLTexture;
+class RenderCommand;
+class RenderTarget;
+class AttachmentPack;
+class Attribute;
+class Buffer;
+class ShaderManager;
+struct StateVariant;
+
+typedef QPair<QString, int> NamedUniformLocation;
+
+class Q_AUTOTEST_EXPORT SubmissionContext : public GraphicsContext
+{
+public:
+    SubmissionContext();
+    ~SubmissionContext();
+
+    int id() const; // unique, small integer ID of this context
+    void setRenderer(Renderer *renderer) { m_renderer = renderer; }
+
+    bool beginDrawing(QSurface *surface);
+    void endDrawing(bool swapBuffers);
+    void releaseOpenGL();
+    void setOpenGLContext(QOpenGLContext* ctx);
+
+    // Viewport
+    void setViewport(const QRectF &viewport, const QSize &surfaceSize);
+    QRectF viewport() const { return m_viewport; }
+
+    // Shaders
+    bool activateShader(GLShader *shader);
+    QOpenGLShaderProgram *activeShader() const { return m_activeShader; }
+
+    // FBO
+    GLuint activeFBO() const { return m_activeFBO; }
+    void activateRenderTarget(const Qt3DCore::QNodeId id, const AttachmentPack &attachments, GLuint defaultFboId);
+    QSize renderTargetSize(const QSize &surfaceSize) const;
+    QImage readFramebuffer(const QRect &rect);
+    void blitFramebuffer(Qt3DCore::QNodeId outputRenderTargetId, Qt3DCore::QNodeId inputRenderTargetId,
+                         QRect inputRect,
+                         QRect outputRect, uint defaultFboId,
+                         QRenderTargetOutput::AttachmentPoint inputAttachmentPoint,
+                         QRenderTargetOutput::AttachmentPoint outputAttachmentPoint,
+                         QBlitFramebuffer::InterpolationMethod interpolationMethod);
+
+    // Attributes
+    void specifyAttribute(const Attribute *attribute,
+                          Buffer *buffer,
+                          const ShaderAttribute *attributeDescription);
+    void specifyIndices(Buffer *buffer);
+
+    // Buffer
+    void updateBuffer(Buffer *buffer);
+    QByteArray downloadBufferContent(Buffer *buffer);
+    void releaseBuffer(Qt3DCore::QNodeId bufferId);
+    bool hasGLBufferForBuffer(Buffer *buffer);
+    GLBuffer *glBufferForRenderBuffer(Buffer *buf);
+
+    // Parameters
+    bool setParameters(ShaderParameterPack &parameterPack);
+
+    // RenderState
+    void setCurrentStateSet(RenderStateSet* ss);
+    RenderStateSet *currentStateSet() const;
+    void applyState(const StateVariant &state);
+
+    void resetMasked(qint64 maskOfStatesToReset);
+    void applyStateSet(RenderStateSet *ss);
+
+    // Wrappers
+    void    clearColor(const QColor &color);
+    void    clearDepthValue(float depth);
+    void    clearStencilValue(int stencil);
+
+
+    // Fences
+    GLFence fenceSync();
+    void    clientWaitSync(GLFence sync, GLuint64 nanoSecTimeout);
+    void    waitSync(GLFence sync);
+    bool    wasSyncSignaled(GLFence sync);
+    void    deleteSync(GLFence sync);
+
+private:
+    void initialize();
+
+    // Material
+    Material* activeMaterial() const { return m_material; }
+    void setActiveMaterial(Material* rmat);
+
+    // FBO
+    void bindFrameBufferAttachmentHelper(GLuint fboId, const AttachmentPack &attachments);
+    void activateDrawBuffers(const AttachmentPack &attachments);
+    void resolveRenderTargetFormat();
+    GLuint createRenderTarget(Qt3DCore::QNodeId renderTargetNodeId, const AttachmentPack &attachments);
+    GLuint updateRenderTarget(Qt3DCore::QNodeId renderTargetNodeId, const AttachmentPack &attachments, bool isActiveRenderTarget);
+
+    // Buffers
+    HGLBuffer createGLBufferFor(Buffer *buffer);
+    void uploadDataToGLBuffer(Buffer *buffer, GLBuffer *b, bool releaseBuffer = false);
+    QByteArray downloadDataFromGLBuffer(Buffer *buffer, GLBuffer *b);
+    bool bindGLBuffer(GLBuffer *buffer, GLBuffer::Type type);
+
+    bool m_ownCurrent;
+    const unsigned int m_id;
+    QSurface *m_surface;
+    QSize m_surfaceSize;
+
+    QOpenGLShaderProgram *m_activeShader;
+
+    QHash<Qt3DCore::QNodeId, HGLBuffer> m_renderBufferHash;
+    QHash<Qt3DCore::QNodeId, GLuint> m_renderTargets;
+    QHash<GLuint, QSize> m_renderTargetsSize;
+    QAbstractTexture::TextureFormat m_renderTargetFormat;
+
+    // cache some current state, to make sure we don't issue unnecessary GL calls
+    int m_currClearStencilValue;
+    float m_currClearDepthValue;
+    QColor m_currClearColorValue;
+
+    Material* m_material;
+    QRectF m_viewport;
+    GLuint m_activeFBO;
+
+    GLBuffer *m_boundArrayBuffer;
+    RenderStateSet* m_stateSet;
+    Renderer *m_renderer;
+    QByteArray m_uboTempArray;
+
+    TextureSubmissionContext m_textureContext;
+    ImageSubmissionContext m_imageContext;
+
+    // Attributes
+    friend class OpenGLVertexArrayObject;
+
+    struct VAOVertexAttribute
+    {
+        HGLBuffer bufferHandle;
+        GLBuffer::Type attributeType;
+        int location;
+        GLint dataType;
+        uint byteOffset;
+        uint vertexSize;
+        uint byteStride;
+        uint divisor;
+        GLenum shaderDataType;
+    };
+
+    using VAOIndexAttribute = HGLBuffer;
+    void enableAttribute(const VAOVertexAttribute &attr);
+    void disableAttribute(const VAOVertexAttribute &attr);
+};
+
+} // namespace Render
+} // namespace Qt3DRender
+
+QT_END_NAMESPACE
+
+#endif // QT3DRENDER_RENDER_SUBMISSIONCONTEXT_H