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// Copyright (C) 2017 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
#include "renderbuffer_p.h"
#include <QOpenGLContext>
#include <QOpenGLFunctions>
QT_BEGIN_NAMESPACE
namespace Qt3DRender {
namespace Render {
namespace OpenGL {
RenderBuffer::RenderBuffer(int width, int height, QAbstractTexture::TextureFormat format)
: m_size(width, height),
m_format(format),
m_renderBuffer(0),
m_context(nullptr)
{
QOpenGLContext *ctx = QOpenGLContext::currentContext();
if (!ctx) {
qWarning("Renderbuffer requires an OpenGL context");
return;
}
m_context = ctx;
QOpenGLFunctions *f = ctx->functions();
f->glGenRenderbuffers(1, &m_renderBuffer);
if (!m_renderBuffer)
return;
f->glBindRenderbuffer(GL_RENDERBUFFER, m_renderBuffer);
while (f->glGetError() != GL_NO_ERROR) { }
f->glRenderbufferStorage(GL_RENDERBUFFER, format, width, height);
GLint err = f->glGetError();
if (err != GL_NO_ERROR)
qWarning("Failed to set renderbuffer storage: error 0x%x", err);
f->glBindRenderbuffer(GL_RENDERBUFFER, 0);
}
RenderBuffer::~RenderBuffer()
{
if (m_renderBuffer) {
QOpenGLContext *ctx = QOpenGLContext::currentContext();
// Ignore the fact that renderbuffers are sharable resources and let's
// just expect that the context is the same as when the resource was
// created. QOpenGLTexture suffers from the same limitation anyway, and
// this is unlikely to become an issue within Qt 3D.
if (ctx == m_context) {
ctx->functions()->glDeleteRenderbuffers(1, &m_renderBuffer);
} else {
qWarning("Wrong current context; renderbuffer not destroyed");
}
}
}
void RenderBuffer::bind()
{
if (!m_renderBuffer)
return;
m_context->functions()->glBindRenderbuffer(GL_RENDERBUFFER, m_renderBuffer);
}
void RenderBuffer::release()
{
if (!m_context)
return;
m_context->functions()->glBindRenderbuffer(GL_RENDERBUFFER, 0);
}
} // namespace OpenGL
} // namespace Render
} // namespace Qt3DRender
QT_END_NAMESPACE
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