THIS CHANGE BREAKS MATERIALS.
This adds getUserTime() in shaders/materials, which returns the time
in second since Renderer::resetUserTime() was called.
Two values are provided, the time in second encoded as a float and
the difference between that and the double value, which together allows
to perform high precision time computation when needed.
This change allows longer running animations in materials. Using only
the float value, give millisecond resolution for more than 4h.
The dimensions passed into the VkBuffer-to-VkImage copy utility
specify a subregion for the copy, not the dimensions of the base level.
We were handling mipmapped cubemaps correctly, but mipmapped 2D images
were incorrect.
* Enable optimization passes on materials with external samplers
Because external samplers are not properly supported by SPIRV and
associated library (spirv-cross and spirv-tools) we currently disable
all optimizations when we encounter a material with external samplers.
This however causes issues on some misbehaved drivers (not running
the optimizations has a side effect which causes a crash). To enable
the optimization pass we simply rely on the Vulkan codegen target to
substitute samplerExternal with sampler2D. We then analyze the output
GLSL (post-optimization) and revert the relevants sampler2D declarations
to samplerExternal declarations.
This fixup only occurs after optimization and for mobile targets and
if external samplers were declared.
* Address review comments
* Add View::setFrontFaceWindingInverted() API
This API can be used to flip all meshes in a render pass
inside out. This is useful for mirrored rendering.
This change also disables face culling on the default skybox
renderable. Since it is unlit, there is no downside to this
and the mesh being in the device vertex domain it can never
be backfacing unless front face winding is inverted.
* Track face winding state in Vulkan
- use the exact required size for bone data instead of always the max
of 256 bones. This also reduces the amount of data to update and
copy into the command stream.
- also get rid of the "reuse component" optimization, which is less
needed now that renderables don't have their own transform UBO.
* grouped MeshAssimp arguments into struct
* added snormuv optimization to MeshAssimp and changed snormuv optimization range from [0, 1] to [-1, 1] in filamesh
This restores the canvas-based decoding method that was removed in #214,
but only for JPEG images. We continue to decode PNG images in C because
canvas-decoding mucks with alpha and prevents us from reading 16-bit
PNG.
Note that the WebGL build uses filameshio, but Android does not. Our
Android samples therefore do not yet understand the compressed format.
For web, I measured the before / after:
```
BEFORE: filament.wasm = 505796, suzanne.filamesh = 521476
AFTER: filament.wasm = 510915, suzanne.filamesh = 333489
```
Issue #558
This also adds it as a dependency to filameshio. This does not seem to
increase the size of the WebGL build even though filameshio is a
dependency, perhaps because we are not using it yet.
