1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
|
#include "compositemaprenderer.hpp"
#include <osg/FrameBufferObject>
#include <osg/RenderInfo>
#include <osg/Texture2D>
#include <algorithm>
namespace Terrain
{
CompositeMapRenderer::CompositeMapRenderer()
: mTargetFrameRate(120)
, mMinimumTimeAvailable(0.0025)
{
setSupportsDisplayList(false);
setCullingActive(false);
mFBO = new osg::FrameBufferObject;
getOrCreateStateSet()->setMode(GL_LIGHTING, osg::StateAttribute::OFF);
}
CompositeMapRenderer::~CompositeMapRenderer() {}
void CompositeMapRenderer::drawImplementation(osg::RenderInfo& renderInfo) const
{
double dt = mTimer.time_s();
dt = std::min(dt, 0.2);
mTimer.setStartTick();
double targetFrameTime = 1.0 / static_cast<double>(mTargetFrameRate);
double conservativeTimeRatio(0.75);
double availableTime = std::max((targetFrameTime - dt) * conservativeTimeRatio, mMinimumTimeAvailable);
std::lock_guard<std::mutex> lock(mMutex);
if (mImmediateCompileSet.empty() && mCompileSet.empty())
return;
while (!mImmediateCompileSet.empty())
{
osg::ref_ptr<CompositeMap> node = *mImmediateCompileSet.begin();
mImmediateCompileSet.erase(node);
mMutex.unlock();
compile(*node, renderInfo);
mMutex.lock();
}
const auto deadline = std::chrono::steady_clock::now() + std::chrono::duration<double>(availableTime);
while (!mCompileSet.empty() && std::chrono::steady_clock::now() < deadline)
{
osg::ref_ptr<CompositeMap> node = *mCompileSet.begin();
mCompileSet.erase(node);
mMutex.unlock();
compile(*node, renderInfo);
mMutex.lock();
if (node->mCompiled < node->mDrawables.size())
{
// We did not compile the map fully.
// Place it back to queue to continue work in the next time.
mCompileSet.insert(node);
}
}
mTimer.setStartTick();
}
void CompositeMapRenderer::compile(CompositeMap& compositeMap, osg::RenderInfo& renderInfo) const
{
// if there are no more external references we can assume the texture is no longer required
if (compositeMap.mTexture->referenceCount() <= 1)
{
compositeMap.mCompiled = compositeMap.mDrawables.size();
return;
}
osg::Timer timer;
osg::State& state = *renderInfo.getState();
osg::GLExtensions* ext = state.get<osg::GLExtensions>();
if (!mFBO)
return;
if (!ext->isFrameBufferObjectSupported)
return;
osg::FrameBufferAttachment attach(compositeMap.mTexture);
mFBO->setAttachment(osg::Camera::COLOR_BUFFER, attach);
mFBO->apply(state, osg::FrameBufferObject::DRAW_FRAMEBUFFER);
GLenum status = ext->glCheckFramebufferStatus(GL_FRAMEBUFFER_EXT);
if (status != GL_FRAMEBUFFER_COMPLETE_EXT)
{
GLuint fboId = state.getGraphicsContext() ? state.getGraphicsContext()->getDefaultFboId() : 0;
ext->glBindFramebuffer(GL_FRAMEBUFFER_EXT, fboId);
OSG_ALWAYS << "Error attaching FBO" << std::endl;
return;
}
// inform State that Texture attribute has changed due to compiling of FBO texture
// should OSG be doing this on its own?
state.haveAppliedTextureAttribute(state.getActiveTextureUnit(), osg::StateAttribute::TEXTURE);
for (unsigned int i = compositeMap.mCompiled; i < compositeMap.mDrawables.size(); ++i)
{
osg::Drawable* drw = compositeMap.mDrawables[i];
osg::StateSet* stateset = drw->getStateSet();
if (stateset)
renderInfo.getState()->pushStateSet(stateset);
renderInfo.getState()->apply();
glViewport(0, 0, compositeMap.mTexture->getTextureWidth(), compositeMap.mTexture->getTextureHeight());
drw->drawImplementation(renderInfo);
if (stateset)
renderInfo.getState()->popStateSet();
++compositeMap.mCompiled;
compositeMap.mDrawables[i] = nullptr;
}
if (compositeMap.mCompiled == compositeMap.mDrawables.size())
compositeMap.mDrawables = std::vector<osg::ref_ptr<osg::Drawable>>();
state.haveAppliedAttribute(osg::StateAttribute::VIEWPORT);
GLuint fboId = state.getGraphicsContext() ? state.getGraphicsContext()->getDefaultFboId() : 0;
ext->glBindFramebuffer(GL_FRAMEBUFFER_EXT, fboId);
}
void CompositeMapRenderer::setMinimumTimeAvailableForCompile(double time)
{
mMinimumTimeAvailable = time;
}
void CompositeMapRenderer::setTargetFrameRate(float framerate)
{
mTargetFrameRate = framerate;
}
void CompositeMapRenderer::addCompositeMap(CompositeMap* compositeMap, bool immediate)
{
std::lock_guard<std::mutex> lock(mMutex);
if (immediate)
mImmediateCompileSet.insert(compositeMap);
else
mCompileSet.insert(compositeMap);
}
void CompositeMapRenderer::setImmediate(CompositeMap* compositeMap)
{
std::lock_guard<std::mutex> lock(mMutex);
CompileSet::iterator found = mCompileSet.find(compositeMap);
if (found == mCompileSet.end())
return;
else
{
mImmediateCompileSet.insert(compositeMap);
mCompileSet.erase(found);
}
}
unsigned int CompositeMapRenderer::getCompileSetSize() const
{
std::lock_guard<std::mutex> lock(mMutex);
return mCompileSet.size();
}
CompositeMap::CompositeMap()
: mCompiled(0)
{
}
CompositeMap::~CompositeMap() {}
}
|
