void OgreRTTexture::begin()
{
Ogre::RenderTexture* rtt = mTexture->getBuffer()->getRenderTarget();
if (mViewport == nullptr)
{
mViewport = rtt->addViewport(nullptr);
mViewport->setClearEveryFrame(false);
mViewport->setOverlaysEnabled(false);
}
Ogre::RenderSystem* system = Ogre::Root::getSingleton().getRenderSystem();
system->_setProjectionMatrix(mProjectMatrix);
mSaveViewport = system->_getViewport();
system->_setViewport(mViewport);
system->clearFrameBuffer(Ogre::FBT_COLOUR, Ogre::ColourValue::ZERO);
}
void OgreImGui::renderQueueEnded(Ogre::uint8 queueGroupId, const Ogre::String& invocation,bool& repeatThisInvocation)
{
if ((queueGroupId != Ogre::RENDER_QUEUE_OVERLAY) || (invocation == "SHADOWS"))
{
return;
}
Ogre::RenderSystem* renderSys = Ogre::Root::getSingletonPtr()->getRenderSystem();
Ogre::Viewport* vp = renderSys->_getViewport();
if ((vp == nullptr) || (!vp->getTarget()->isPrimary()) || mFrameEnded)
{
return;
}
mFrameEnded = true;
ImGui::Render();
this->updateVertexData();
ImGuiIO& io = ImGui::GetIO();
// Construct projection matrix, taking texel offset corrections in account (important for DirectX9)
// See also:
// - OGRE-API specific hint: http://www.ogre3d.org/forums/viewtopic.php?f=5&p=536881#p536881
// - IMGUI Dx9 demo solution: https://github.com/ocornut/imgui/blob/master/examples/directx9_example/imgui_impl_dx9.cpp#L127-L138
const float texelOffsetX = renderSys->getHorizontalTexelOffset();
const float texelOffsetY = renderSys->getVerticalTexelOffset();
const float L = texelOffsetX;
const float R = io.DisplaySize.x + texelOffsetX;
const float T = texelOffsetY;
const float B = io.DisplaySize.y + texelOffsetY;
Ogre::Matrix4 projMatrix( 2.0f/(R-L), 0.0f, 0.0f, (L+R)/(L-R),
0.0f, -2.0f/(B-T), 0.0f, (T+B)/(B-T),
0.0f, 0.0f, -1.0f, 0.0f,
0.0f, 0.0f, 0.0f, 1.0f);
mPass->getVertexProgramParameters()->setNamedConstant("ProjectionMatrix", projMatrix);
for(std::list<ImGUIRenderable*>::iterator it = mRenderables.begin(); it!=mRenderables.end(); ++it)
{
mSceneMgr->_injectRenderWithPass(mPass, (*it), false, false, nullptr);
}
}
void OgreImGui::Render()
{
// Construct projection matrix, taking texel offset corrections in account (important for DirectX9)
// See also:
// - OGRE-API specific hint: http://www.ogre3d.org/forums/viewtopic.php?f=5&p=536881#p536881
// - IMGUI Dx9 demo solution: https://github.com/ocornut/imgui/blob/master/examples/directx9_example/imgui_impl_dx9.cpp#L127-L138
ImGuiIO& io = ImGui::GetIO();
Ogre::RenderSystem* renderSys = Ogre::Root::getSingletonPtr()->getRenderSystem();
const float texelOffsetX = renderSys->getHorizontalTexelOffset();
const float texelOffsetY = renderSys->getVerticalTexelOffset();
const float L = texelOffsetX;
const float R = io.DisplaySize.x + texelOffsetX;
const float T = texelOffsetY;
const float B = io.DisplaySize.y + texelOffsetY;
Ogre::Matrix4 projMatrix( 2.0f/(R-L), 0.0f, 0.0f, (L+R)/(L-R),
0.0f, -2.0f/(B-T), 0.0f, (T+B)/(B-T),
0.0f, 0.0f, -1.0f, 0.0f,
0.0f, 0.0f, 0.0f, 1.0f);
mPass->getVertexProgramParameters()->setNamedConstant("ProjectionMatrix", projMatrix);
// Instruct ImGui to Render() and process the resulting CmdList-s
/// Adopted from https://bitbucket.org/ChaosCreator/imgui-ogre2.1-binding
/// ... Commentary on OGRE forums: http://www.ogre3d.org/forums/viewtopic.php?f=5&t=89081#p531059
ImGui::Render();
ImDrawData* draw_data = ImGui::GetDrawData();
Ogre::Viewport* vp = renderSys->_getViewport();
int vpWidth = vp->getActualWidth();
int vpHeight = vp->getActualHeight();
for (int i = 0; i < draw_data->CmdListsCount; ++i)
{
const ImDrawList* draw_list = draw_data->CmdLists[i];
unsigned int startIdx = 0;
for (int j = 0; j < draw_list->CmdBuffer.Size; ++j)
{
// Create a renderable and fill it's buffers
ImGUIRenderable renderable;
const ImDrawCmd *drawCmd = &draw_list->CmdBuffer[j];
renderable.updateVertexData(draw_list->VtxBuffer.Data, &draw_list->IdxBuffer.Data[startIdx], draw_list->VtxBuffer.Size, drawCmd->ElemCount);
// Set scissoring
int scLeft = static_cast<int>(drawCmd->ClipRect.x); // Obtain bounds
int scTop = static_cast<int>(drawCmd->ClipRect.y);
int scRight = static_cast<int>(drawCmd->ClipRect.z);
int scBottom = static_cast<int>(drawCmd->ClipRect.w);
scLeft = scLeft < 0 ? 0 : (scLeft > vpWidth ? vpWidth : scLeft); // Clamp bounds to viewport dimensions
scRight = scRight < 0 ? 0 : (scRight > vpWidth ? vpWidth : scRight);
scTop = scTop < 0 ? 0 : (scTop > vpHeight ? vpHeight : scTop);
scBottom = scBottom < 0 ? 0 : (scBottom > vpHeight ? vpHeight : scBottom);
renderSys->setScissorTest(true, scLeft, scTop, scRight, scBottom);
// Render!
mSceneMgr->_injectRenderWithPass(mPass, &renderable, false, false, nullptr);
// Update counts
startIdx += drawCmd->ElemCount;
}
}
renderSys->setScissorTest(false);
}