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39
40#include "renderbuffer_p.h"
41#include <QOpenGLContext>
42#include <QOpenGLFunctions>
43
44QT_BEGIN_NAMESPACE
45
46namespace Qt3DRender {
47namespace Render {
48namespace OpenGL {
49
50RenderBuffer::RenderBuffer(int width, int height, QAbstractTexture::TextureFormat format)
51 : m_size(width, height),
52 m_format(format),
53 m_renderBuffer(0),
54 m_context(nullptr)
55{
56 QOpenGLContext *ctx = QOpenGLContext::currentContext();
57 if (!ctx) {
58 qWarning(msg: "Renderbuffer requires an OpenGL context");
59 return;
60 }
61
62 m_context = ctx;
63 QOpenGLFunctions *f = ctx->functions();
64 f->glGenRenderbuffers(n: 1, renderbuffers: &m_renderBuffer);
65 if (!m_renderBuffer)
66 return;
67
68 f->glBindRenderbuffer(GL_RENDERBUFFER, renderbuffer: m_renderBuffer);
69 while (f->glGetError() != GL_NO_ERROR) { }
70 f->glRenderbufferStorage(GL_RENDERBUFFER, internalformat: format, width, height);
71 GLint err = f->glGetError();
72 if (err != GL_NO_ERROR)
73 qWarning(msg: "Failed to set renderbuffer storage: error 0x%x", err);
74 f->glBindRenderbuffer(GL_RENDERBUFFER, renderbuffer: 0);
75}
76
77RenderBuffer::~RenderBuffer()
78{
79 if (m_renderBuffer) {
80 QOpenGLContext *ctx = QOpenGLContext::currentContext();
81
82 // Ignore the fact that renderbuffers are sharable resources and let's
83 // just expect that the context is the same as when the resource was
84 // created. QOpenGLTexture suffers from the same limitation anyway, and
85 // this is unlikely to become an issue within Qt 3D.
86 if (ctx == m_context) {
87 ctx->functions()->glDeleteRenderbuffers(n: 1, renderbuffers: &m_renderBuffer);
88 } else {
89 qWarning(msg: "Wrong current context; renderbuffer not destroyed");
90 }
91 }
92}
93
94void RenderBuffer::bind()
95{
96 if (!m_renderBuffer)
97 return;
98
99 m_context->functions()->glBindRenderbuffer(GL_RENDERBUFFER, renderbuffer: m_renderBuffer);
100}
101
102void RenderBuffer::release()
103{
104 if (!m_context)
105 return;
106
107 m_context->functions()->glBindRenderbuffer(GL_RENDERBUFFER, renderbuffer: 0);
108}
109
110} // namespace OpenGL
111} // namespace Render
112} // namespace Qt3DRender
113
114QT_END_NAMESPACE
115

source code of qt3d/src/plugins/renderers/opengl/textures/renderbuffer.cpp