While revising the depth-texture implementation, I noticed that we would take advantage of that feature for performance instead of quality. With depth-textures the GPU can perform bilinear interpolation of the depth-test, so a single sample (tap) roughly corresponds to a classical 4-tap PCF in the shader. So what we did was just doing a 1 sample instead of 4. However for hardware capable of depth-textures, performance is typically not an issue, so we should rather improve quality.
The images below show crops from the ShaderSystem sample at 200%. On the left, you see the old setting, while the new setting is in the middle. On the right, you see the 4-tap shader fallback used when depth-textures are not available i.e. on D3D9 and GLES2.
Yeah, so the other news is that D3D11 finally got depth-texture (PF_DEPTH) support as well.
But what if you need to support RenderSystems without PF_DEPTH or you are on GLES2 where PF_DEPTH support is not guaranteed. Well, Ogre will now gracefully fall back to the closeset non-depth format: e.g. PF_DEPTH16 > PF_L16 and the RTSS will then deal with the differences.
While at it, I also updated the default shadow material settings to be more robust as in shadow aliasing artefacts:
I took another look at the documentation and added a CI test to detect docstring inconsistencies like undocumented or superficial parameters. This should help improving the documentation quality of external and my own pull-requests.While at it I also added doxygen groups to several large classes. These allow tying related methods together. See e.g. the Material class:
Next, it kind of bothered me that one has to write so verbose code, when using the Python bindings, so I tried to take advantage of Python protocols:
# Now, instead of specifying the type as before
vp.setBackgroundColour(Ogre.ColourValue(.3, .3, .3))
# you can do
vp.setBackgroundColour((.3, .3, .3))
# or even
Also, bytes objects are now supported where raw pointers are expected in the API:
# so you can do
arr = np.zeros((256, 256, 3), dtype=np.uint8)
ogre_img.loadDynamicImage(arr, 256, 256, Ogre.PF_BYTE_RGB)
OgreUnifiedShader as a Cg replacement
In an effort to provide an modern alternative for Cg and to reduce the maintenance overhead of the Ogre internal shaders, I created the OgreUnifiedShader.h that allows writing cross-platform shaders. It is greatly inspired by the shiny library for Ogre and the shaderc tool of bgfx. However, in contrast to the latter this header is fully self-contained. All you need to do is #include it – no need to run an additional tool. It also has the advantage that you can run your shader through the standard c preprocessor (cpp) to see what the transformed shader looks like.
Just as bgfx, I opted for GLSL as the least common denominator between the shader languages. That is with some preprocessor based abstractions on top:
Declare Samplers with SAMPLER2D/3D/CUBE/.. macros instead of sampler2D/3D/Cube/..
Use the HLSL style mul(x, y) for matrix multiplication
Use mtxFromRows to construct matrices
Declare parameters with IN/ OUT macros instead of attribute/ varying
Use the MAIN_PARAMETERS & MAIN_DECLARATION macros instead of void main()
Here, I tried to maintain compatibility with bgfx where possible.
For an example of usage, see this PR, where I converted the Light Shafts Demo from Cg to HLSL & GLSL. As you can see there is still some room for improvements on the Ogre Material side.
Anyway, this allowed to drop 1800 lines (#1663) of shader code from the RTSS and we now have arrived at a single, GLSL based, shader library. When I joined Ogre there were 4 RTSS implementations (GLSL, GLSLES, HLSL, Cg) – with individual, subtle, bugs.
blender2ogre for Blender 2.8x
Thanks to a contribution by “Grodou” blender2ogre gained back the ability to export textures with Blender 2.8x, which is notable as we need to read from the node-based shaders for this. Together with some additional fixes by yours truly and the initial porting done by Paul Gerke, this brings exporting with Blender 2.8x roughly at the same level as with Blender 2.7x.
However, we can now take advantage of the texture semantics one gets from the Cycles materials. Thereofore, blender2ogre is able to correctly export emissive textures and, notably, normal maps.
The difference in appearance that you see above is due to the missing gamma handling. Also, to fully match what you see in Blender, we need add support for metalness and roughness maps.
The 1.12.7 point release kept its focus on integration. Notably, it ships the new Metal RenderSystem, that was discussed in a previous post. Also there are the following notable changes:
Improved Terrain Rendering: The lighting computation was pretty messed up before, which I could fix. See the following screens for comparison. Also, now vertex compression (60% less data per vertex) is used with OpenGL, too.
Filament shader support: Thanks to a contribution of SNiLD, I could extend the existing PBR sample to showcase the usage of Filament PBR shaders. The images below also show the existing glTF2 based material and how far you get by only using plain ogre materials.
New stable CSM Sample: I found another interesting Demo on the Forums and added it as a Sample to the Sample Browser. This time it is “Cascaded Shadow Mapping” which resembles the implementation you get in the CryEngine. This is a different take on the PSSM Shadow Mapping Algorithm, which is best explained by visualizing it
Debug view in the PSSM RTShader: While working on the CSM Sample, I found the debug split view particularly useful. Therefore, you can now visualize how the PSSM Shadow splits are placed in your scene – check out the updated ShaderSystem Sample.
OgreMeshViewer: LOD preview
If your mesh contains LOD levels, Meshviewer will now display a new tab, highlighting the currently active level
If you would like to know how to automatically generate LOD for your meshes, see the updated Ogre Tutorial.
The Metal RenderSystem backport from Ogre-next, that I talked about in the last round-up, now has landed in the master branch and will be available with Ogre 1.12.7. See the screenshot below for the SampleBrowser running on Metal
The current implementation pretends to have Fixed Function capabilities. Leveraging the unified FFP API introduced with the initial 1.12 release, this allows operating with a default shader. This shader only supports using a single 2D texture without lighting. E.g. vertex color is not supported. This is why the text is white instead of black in the screenshot above.
Proper lighting and texturing support, requires a Metal Shader Language support in the RTSS, which is not there yet. However, if you are mainly using custom shaders on OSX, you can start experimenting with Metal now. Furthermore, buffer updates are currently slowish, as staging buffers had to be disabled. Therefore, the Metal RenderSystem is tagged as EXPERIMENTAL.
Further development will happen at a lower pace though, as Metal neither has the large prevalence of D3D11 nor gives the synergy effects across platforms we have with OpenGL.
So if you want full Metal support in Ogre1, consider contributing and fixing bugs. The code was simplified during backporting, which shows by the size reduction from 14k loc in v2.1 to 9k loc that are now in Ogre1.
The 1.12.6 point release kept its focus on integration. Notably, it ships the Qt OgreBites implementation, that was discussed in the previous post. Also there are the following notable changes:
The OSX & iOS support was vastly improved. If you had any issues with using Ogre in these enviroments, please try again with Ogre 1.12.6. The improvements include scaling the input events along the window content scaling and corrected library resolution from inside an .app bundle. I also started backporting the Metal RenderSystem to the 1.x series. See the metal-wip branch. Help is welcome.
Also Ogre 1.12 is now available in Debian sid & unstable. Notably, this also covers the python bindings and imgui. So prototyping a 3D application is only a apt install python3-ogre-1.12 away. Also this is a major step forward from the previous Ogre 1.9 package and allows 3rd party apps like ROS relying on it. These packges are also availble in the latest Ubuntu 20.04 release, which is based off Debian unstable.
Next, the MSVC SDK was refined: it now properly packages and compiles the C# ibindings. You no longer have to compile any Ogre C# sources yourself. As for C++, the pdb files are finally included, which allows you using the SDK for debugging (note that the build type still is RelWithDebInfo and not Debug).
The refined “Fixed Pipeline Enabled” RenderSystem option allows you to bring the legacy GL & D3D9 RenderSystems into a programmable pipeline only mode. Setting it to false is the first step, if you consider porting to GL3+ & D3D11 as it will enable the RTSS shader generation, while keeping everything else the same. It also allows you toggling forth and back between shader based and fixed pipeline to compare rendering, instead of having to pull the plug once and for all.
Probably the biggest strength of Ogre 1.x is the legacy of content creation tools and addons. Here, I resurrected the following tools beneath the OGRECave umbrella:
The meshmagick CLI .mesh optimization and manipulation tool. It allows you to conveniently change the coordinate system or merge all sub-meshes into one buffer.
The shiny shader meta-compiler & management library. In the mid-term we want to extend the RTSS by similar features and generally recommend to prefer the RTSS. However, there are some existing projects relying on this library, and this allows them to upgrade to recent Ogre releases.
The ogre-gpgpu toolkit. This is a collection of many Computer Vision and Augmented Reality related tools built around Ogre. So far, I only brought back the Ogre-CUDA bridge. When it is ready, this probably will be moved into the core repository. Therefore, this project can be considered as a staging area.
While there have been snippets to provide Ogre integration with Qt for a long time, there is now an officially provided version in master and scheduled for Ogre 1.12.6.
This integration requires Qt5 and builds upon the ApplicationContext abstraction living in OgreBites which already handles SDL2 windowing and Activities on Android. In contrast to previous attempts this means that it does not follow the “QtOgreWidget approach”. This might sound less convenient, but is necessary to properly handle multiple Ogre Windows or Ogre Views. Also it should be familiar for everybody who is using the QApplication API.
The implementation lives in a separate libOgreBitesQt.so library which is only created when Qt is detected when building – so if you do not use it, you do not have to care about Qt dependencies.
The API is designed to be a drop-in replacement for ApplicationContext. This means that you can just take the setup tutorial, but use the ApplicationContextQt instead and your app will be Qt5 based. Also, because of the Input event abstraction we did for Ogre 1.11.0, the CameraMan and Trays code will continue working – just like the Event forwarding to ImGui.
Furthermore, I have ensured that the API also fits when the Qt Event loop is used and adapts to existing projects. For this, I have ported ogitor and spacescape to the new API. Notably, with spacescape the Ogre view is now only redrawn on-demand when things change (e.g. settings, window resize).
The exposed API is QWindow based making it lightweight as only the QtGui module is required. Also this should allow extending it for QtQuick in the future, which is also QWindow based.