We don't have a C++ expert on hand, but taking a pointer to one member
and expecting to access another by an offset is very fishy:
- for one, there could theoretically be padding
- the compiler might assume that we are only writing to that first member
The new code has shown to be free for constant parameter values.
Non-constant ones cause the assembly to have branches (why?), but we don't
use that much.
see #15761
SDL is the only device that supports relative mode and
mouse input is actually somewhat broken if it's *not* enabled.
This reverts commit 45c5ef8798
and 88b007907a.
- Actually it's MSAA I think, or perhaps the terms are equivalent
- I've made it fit into the existing Irrlicht architecture, but that has resulted in code duplication compared to my original "hacky" approach
- OpenGL 3.2+ and OpenGL ES 3.1+ are supported
- EDT_OPENGL3 is not required, EDT_OPENGL works too
- Helpful tutorial: https://learnopengl.com/Advanced-OpenGL/Anti-Aliasing, section "Off-screen MSAA"
- This may be rough around the edges, but in general it works
SColor.h contains many functions which are unused and/or perform linear
operations on non-linear 8 bit sRGB color values, such as the plus operator and
`SColor::getInterpolated()`, and there is no documentation about missing gamma
correction.
Some of these functions are not called or called only once:
* `getAverage(s16 color)`: Unused
* `SColor::getLightness()`: Unused
* `SColor::getAverage()`: Claims to determine a color's average intensity but
calculates something significantly different since SColor represents
non-linear sRGB values.
* `SColor::getInterpolated_quadratic()`: Claims to interpolate between colors
but uses the sRGB color space, which is neither physically nor perceptually
linear.
* `SColorf::getInterpolated_quadratic()`: Unused
* `SColorf::setColorComponentValue()`: Unused
Removing or inlining these functions can simplify the code and documenting
gamma-incorrect operations can reduce confusion about what the functions do.
This commit does the following:
* Remove the above-mentioned unused functions
* Inline `SColor::getAverage()` into
`CIrrDeviceLinux::TextureToMonochromeCursor()`
* Rename `SColor::getLuminance()` into `SColor::getBrightness()` since it does
not determine a color's luminance but calculates something which differs
significantly from physical luminance since SColor represents non-linear sRGB
values.
* Inline `SColor::getInterpolated_quadratic()` into `GameUI::update()`,
where it is only used for the alpha value calculation for fading
* Document gamma-incorrect behaviour in docstrings
