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Frustum mapping + GraphUI Support
AABBox clipping naturally couldn't be transformed into 3D Model-View (Mv) Space,
as it is axis aligned and only provided 2 points (min/max).
Therefor we map the Group's AABBox to a 8-point Cube,
perform the Mv-transformation and then produce the 6-plane Frustum.
As before, we cull fully outside shapes within the Group's draw method
and perform fragment clipping with same Frustum planes in the shader.
With clipping enabled, the 3D z-axis getBounds() depth
will be slightly increased for functional Frustum operation.
This is also done for setFixedSize(Vec2f).
The Frustum planes are copied to the Graph shader
via float[4*6] -> uniform vec4 gcu_ClipFrustum[6]; // L, R, B, T, N, F each {n.x, n.y, n.z, d}
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Concludes related work of below commits
- 1040bed4ecc6f4598ea459f1073a9240583fc3c3
- 5cca51e32999a882e2a5f00cb45ecafc824ffd86
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'and'/'or' semantic (swapped); Add EPSILON in clip_coord(..) and add is_inside(..) function
Complete overload vec2 and vec3 variants
Fix 'and'/'or' semantic (swapped)
- 'and' uses multiplication, i.e. all arguments must be > 0 (ideally 1)
- 'or' uses addition, i.e. only one arguments must be > 0 (ideally 1)
- both uses clamp [0..1]
Add EPSILON in clip_coord(..)
- Only 'coord > high+EPSILON' is outside
Add is_inside(..) function
- Similar to clip_coord(..) but returns float 0 or 1
instead of selecting color.
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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
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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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