With WebGL1, an extension is required for dFdx. On the other hand,
with WebGL2, GLSL ES 300 is required and the extension is forbidden.
This change fixes shaderir/glsl to switch the output depends on the
WebGL version.
This change also adds a new build tag 'ebitenwebgl1' forcing WebGL 1.
Updates #1404
This change adds an optional function Draw to the Game interface.
With Draw function, the game logic and rendering are separate.
There are some benefits:
* The API is clearer and easier to understand.
* When TPS < FPS, smoother rendering can be performed without
changing the game logic depending on TPS.
* Porting to XNA, which has separate functions Update and Draw,
would be a little easier.
Draw is optional due to backward compatibility. Game interface was
already used before v1.11.x in mobile packages, and adding a
function would break existing code unfortunately. Then, we adopted
switching the behavior based on whether Draw is implemented or not
by type assertions.
IsDrawingSkipped will always return false when Draw is implemented.
Fixes#1104
This change introduces the new APIs RunGame, WindowSize and
SetWindowSize. These new APIs hides the notion of 'scale', and is
more flexible with the outside size change. This means that we can
introduce a resizable window.
This change also adds -legacy flag to examples/windowsize. If the
flag is off, the new APIs are used.
This change deprecates these functions since the notion of 'scale'
is deprecated:
* ScreenScale
* ScreenSizeInFullscreen
* SetScreenScale
* SetScreenSize
Fixes#943, #571
Updates #320
EBITEN_INTERNAL_IMAGES_KEY is now disabled by default, and enabled
only when a build tag 'ebitendebug' is specified. It is because
game developers might want to disable EBITEN_INTERNAL_IMAGES_KEY
when they release their games, or anyone can dump the internal
images.
Fixes#632.
