C++ RenderSystem::getVerticalTexelOffset方法代码示例

	OgreRTTexture::OgreRTTexture(Ogre::TexturePtr _texture) :
		mViewport(nullptr),
		mSaveViewport(nullptr),
		mTexture(_texture)
	{
		mProjectMatrix = Ogre::Matrix4::IDENTITY;
		Ogre::Root* root = Ogre::Root::getSingletonPtr();
		if (root != nullptr)
		{
			Ogre::RenderSystem* system = root->getRenderSystem();
			if (system != nullptr)
			{
				size_t width = mTexture->getWidth();
				size_t height = mTexture->getHeight();

				mRenderTargetInfo.maximumDepth = system->getMaximumDepthInputValue();
				mRenderTargetInfo.hOffset = system->getHorizontalTexelOffset() / float(width);
				mRenderTargetInfo.vOffset = system->getVerticalTexelOffset() / float(height);
				mRenderTargetInfo.aspectCoef = float(height) / float(width);
				mRenderTargetInfo.pixScaleX = 1.0f / float(width);
				mRenderTargetInfo.pixScaleY = 1.0f / float(height);
			}

			if (mTexture->getBuffer()->getRenderTarget()->requiresTextureFlipping())
			{
				mProjectMatrix[1][0] = -mProjectMatrix[1][0];
				mProjectMatrix[1][1] = -mProjectMatrix[1][1];
				mProjectMatrix[1][2] = -mProjectMatrix[1][2];
				mProjectMatrix[1][3] = -mProjectMatrix[1][3];
			}
		}
	}

 void updateRenderInfo()
 {
     if (mRenderSystem != nullptr)
     {
         mInfo.maximumDepth = mRenderSystem->getMaximumDepthInputValue();
         mInfo.hOffset = mRenderSystem->getHorizontalTexelOffset() / float(mViewSize.width);
         mInfo.vOffset = mRenderSystem->getVerticalTexelOffset() / float(mViewSize.height);
         mInfo.aspectCoef = float(mViewSize.height) / float(mViewSize.width);
         mInfo.pixScaleX = 1.0f / float(mViewSize.width);
         mInfo.pixScaleY = 1.0f / float(mViewSize.height);
     }
 }

	void LayerManager::_windowResized(const FloatSize& _size)
	{
		// новый размер
		mViewSize = _size;

		mPixScaleX = 1.0 / _size.width;
		mPixScaleY = 1.0 / _size.height;
		mAspectCoef = _size.height / _size.width;

		Ogre::RenderSystem * render = Ogre::Root::getSingleton().getRenderSystem();

        mHOffset = render->getHorizontalTexelOffset() / _size.width;
        mVOffset = render->getVerticalTexelOffset() / _size.height;

		// обновить всех
		mUpdate = true;

	}

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);
}