OpenXR provides APIs to enumerate the supported refresh-rates, and
selecting a new refresh-rate. This patch adds two new APIs to the
lovr.headset module:
- lovr.headset.getDisplayFrequencies():
Returns a table containing the supported refresh-rates on
success; nil otherwise.
- lovr.headset.setDisplayFrequency(refreshRate:number):
Returns true on success, false otherwise.
Only the OpenXR backend has support for this feature and it is
gated by the "refreshRate" feature flag, similarly to what the
"getDisplayFrequency()" API does.
Physics world's "quick step" is executed in multiple iteration steps.
The getter and setter for this value is now made available as two new
methods in the World object.
This is allows user to balance between the less accurate but quick
simulations, and more stable behavior of physics.
Something similar was already possible, by reducing the delta time and
running the sim multiple times per frame. However, any force user applies
to collider is zeroed after each step. User would thus have to keep track
of applied forces, and re-apply them inside the physics iteration loop.
By default ODE uses 20 iterations in quick step.
We don't have a good way of returning filesystem error messages yet,
but it's still useful to return a boolean instead of a number to
detect failure of zero byte writes. Exposing the number of bytes
written is kind of weird since it's not very actionable.
Notes:
- We can actually use a single Activity.java file for oculus/pico now
- We can unconditionally compile os_android.c on Android
- No need for including extra jars in build system
- Headset rendering is guaranteed synchronous now, no need to ref L
- Add an "android flavor" build setting to differentiate between oculus
and pico devices, since they both use OpenXR.
- Update the pico manifest to reflect their OpenXR sample
- Remove some OpenGL hacks that aren't necessary anymore
Currently there is a single allocator function used in arr_t. Its
behavior depends on the values for the pointer and size arguments:
- If pointer is NULL, it should allocate new memory.
- If pointer is non-NULL and size is positive, it should resize memory.
- If size is zero, it should free memory.
All instances of arr_t use realloc for this right now. The problem
is that realloc's behavior is undefined when the size argument is zero.
On Windows and Linux, realloc will free the pointer, but on macOS this
isn't the case. This means that arr_t leaks memory on macOS.
It's best to not rely on undefined behavior like this, so let's instead
use a helper function that behaves the way we want.
Functions to calculate the angle between two vectors. Angle is always
positive. Implementations give the same result as this Lua code:
```lua
local function lua_angle(v1, v2)
return math.acos(v1:dot(v2) / (v1:length() * v2:length()))
end
```
If either vector is zero-length, the pi/2 value is returned.
These functions read an unsigned 32 bit integer from the Lua stack
and error if the value is negative or too big. Currently converting
Lua numbers to integers will silently wrap or invoke undefined behavior
when they are outside of the acceptable range.
For projects that don't want the overhead of type/bounds checks, the
supercharge build option (LOVR_UNCHECKED) can now be used to skip all
type/bounds checks.
Correcting the order of stack operations to fetch RGB components from
the table and to put in conversion the results.
Before the fix these two calls produced different results:
`lovr.math.gammaToLinear( 0.1, 0.2, 0.3 )`
`lovr.math.gammaToLinear( {0.1, 0.2, 0.3} )`
The current flag did not work because float shader flags are not
supported. It was also not very useful because it was per-shader
and did not use the alpha cutoff property of glTF materials.
Instead, let's turn the shader flag into an enable/disable boolean,
and add a scalar material property named "alphacutoff" that gets
read by the glTF importer.
When the alphaCutoff flag is enabled, the material property will be
compared against the pixel's alpha value to decide whether it should
get discarded.
Samuel Gosselin
Josip Miskovic
bjorn
murat g