DrawTriangles was introduced at #1508, and apparently there is no
reason we should use ReplacePixels here. So, simplify the logic by
using only DrawTriangles.
This constant was set with some wrong assumptions:
1. On Android, recovering was needed.
2. On iOS, OpenGL ES was used when
a. The architecture was 386 or amd64 == an emulator is used
b. The build tag ebitengl was not specified
c. gomobile-build was used
3. On browsers, recovering was needed.
1., 2b, and 2c are correct.
2a. is not correct: Now emulators are available on all the
architectures with both Metal and OpenGL.
3. is not correct: Ebiten no longer recovers the contest lost.
Now, Ebiten can detect a context lost explicitly when
1. On Android
2. On iOS and on gomobile-build
(When gomobile-build is used, OpenGL should always be used)
Based on this fact, this change changes the constant to a variable,
and fixes the logic to set the variable.
isTexture was used to detect context-lost and called every frame.
This was not good for performance.
This change adds a way to notify context-lost from the WebGL
handlers directly, and the package restorable uses it instead of
calling (*Image).isInvalaidated.
Fixes#1175
When a shader is disposed, all the images depending on it should
become stale, i.e., discard its all the rendering history items,
because they cannot be restored due to the lack of data on the GPU.
(driver.Graphics).BeginFrame tries to restore the images, but
the context might be lost at that time yet. If the attempt to
restore the context because the driver is not ready, return
silently.
Fixes#1133
Now grpahicscommand saves the error and shows the error after a
while. This was good to simplify the API but was the cause to hide
some issues.
This change fixes all the errors to be returned immediately, and
buffer this in the ebiten package instead.
Fixes#971
A current texture ID and a new texture ID can be duplicated.
Disposing part of textures and creating textures at the same time
can make contradicted situation.
Only finalizers are problematic since they can stop everything,
but other things are not. Let's care finalizers and just use
regular locks.
Updates #913
