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available; JOGL ImageSequence: Add addFrame(GL, TextureFrame), remove*Frame() and isSequenceAnimating()
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RegionRenderer's RenderState usually rarely set from top of user API, reducing complexity.
Discussion:
Alternative was to pass AA-Quality same as SampleCount from the top (e.g. GraphUI Scene),
however, this convolutes the API even more.
Both parameter modify the resulting shader code in pass2 rendering (only).
The used 'renderMode' is still maintained within the Region,
since it contains more dynamic states individual to each Region instance (color-texture, ..).
This despite 'renderMode' also changes the RenderState's shader program.
In the end, it really doesn't matter and is a choice of frequency - the pipeline is
usually rendering from on OpenGL rendering thread sequentially.
AA-Quality and SampleCount simply usually don't change that often
and are set only once.
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aspect-ratio, letter-boxed or zoomed (config) + Bug 1466 Fix color mixing
Bug 1465: Region currently simply bloats a given texture to its region AABBox,
which renders textures with the wrong aspect ratio.
Add facility to program the texture-coordinates to either letter-box
or scaled-up (and cut) true aspect-ratio.
Default shall be zoom (scale-up and cut),
but user shall be able to set a flag in the Region for letter-box.
Have the shader clip texture coordinates properly,
best w/o branching to soothe performance.
See functions.glsl
+++
Bug 1466: Current color mix: texture * color_channel * color_static
is useless in GraphUI.
color_static shall modulate the texture, which works.
But in case of color_channel (attribute/varying)
we want it to be mixed so it can become the more dominant color
for e.g. a border.
Desired is:
color = vec4( mix( tex.rgb * gcu_ColorStatic.rgb, gcv_Color.rgb, gcv_Color.a ),
mix( tex.a * gcu_ColorStatic.a, 1, gcv_Color.a) );
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original color, adjust defaults accordingly
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GL/VK abstraction at a later time differently
Actual GPU rendering toolkit dependency can be abstracted differently, i.e. GPU <- { GL, VK } etc.
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