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39
40#ifndef QSGDEPTHSTENCILBUFFER_P_H
41#define QSGDEPTHSTENCILBUFFER_P_H
42
43//
44// W A R N I N G
45// -------------
46//
47// This file is not part of the Qt API. It exists purely as an
48// implementation detail. This header file may change from version to
49// version without notice, or even be removed.
50//
51// We mean it.
52//
53
54#include <QtCore/qsize.h>
55#include <QtGui/private/qopenglcontext_p.h>
56#include <QtGui/private/qopenglextensions_p.h>
57#include <QtCore/qsharedpointer.h>
58#include <QtCore/qhash.h>
59
60QT_BEGIN_NAMESPACE
61
62class QSGDepthStencilBufferManager;
63
64class QSGDepthStencilBuffer
65{
66public:
67 enum Attachment
68 {
69 NoAttachment = 0x00,
70 DepthAttachment = 0x01,
71 StencilAttachment = 0x02
72 };
73 Q_DECLARE_FLAGS(Attachments, Attachment)
74
75 struct Format
76 {
77 QSize size;
78 int samples;
79 QSGDepthStencilBuffer::Attachments attachments;
80 bool operator == (const Format &other) const;
81 };
82
83 QSGDepthStencilBuffer(QOpenGLContext *context, const Format &format);
84 virtual ~QSGDepthStencilBuffer();
85
86 // Attaches this depth stencil buffer to the currently bound FBO.
87 void attach();
88 // Detaches this depth stencil buffer from the currently bound FBO.
89 void detach();
90
91 QSize size() const { return m_format.size; }
92 int samples() const { return m_format.samples; }
93 Attachments attachments() const { return m_format.attachments; }
94
95protected:
96 virtual void free() = 0;
97
98 QOpenGLExtensions m_functions;
99 QSGDepthStencilBufferManager *m_manager;
100 Format m_format;
101 GLuint m_depthBuffer;
102 GLuint m_stencilBuffer;
103
104 friend class QSGDepthStencilBufferManager;
105};
106
107Q_DECLARE_OPERATORS_FOR_FLAGS(QSGDepthStencilBuffer::Attachments)
108
109inline bool QSGDepthStencilBuffer::Format::operator == (const Format &other) const
110{
111 return size == other.size && samples == other.samples && attachments == other.attachments;
112}
113
114
115class QSGDefaultDepthStencilBuffer : public QSGDepthStencilBuffer
116{
117public:
118 QSGDefaultDepthStencilBuffer(QOpenGLContext *context, const Format &format);
119 virtual ~QSGDefaultDepthStencilBuffer();
120
121protected:
122 void free() override;
123};
124
125
126class QSGDepthStencilBufferManager
127{
128public:
129 QSGDepthStencilBufferManager(QOpenGLContext *ctx) : m_context(ctx) { }
130 ~QSGDepthStencilBufferManager();
131 QOpenGLContext *context() const { return m_context; }
132 QSharedPointer<QSGDepthStencilBuffer> bufferForFormat(const QSGDepthStencilBuffer::Format &fmt);
133 void insertBuffer(const QSharedPointer<QSGDepthStencilBuffer> &buffer);
134
135private:
136 typedef QHash<QSGDepthStencilBuffer::Format, QWeakPointer<QSGDepthStencilBuffer> > Hash;
137 QOpenGLContext *m_context;
138 Hash m_buffers;
139
140 friend class QSGDepthStencilBuffer;
141};
142
143extern uint qHash(const QSGDepthStencilBuffer::Format &format);
144
145QT_END_NAMESPACE
146
147#endif
148

source code of qtdeclarative/src/quick/scenegraph/util/qsgdepthstencilbuffer_p.h