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vo_opengl: use RPN expressions for user hook sizes

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This replaces the previous TRANSFORM by WIDTH, HEIGHT and OFFSET where
WIDTH and HEIGHT are RPN expressions. This allows for more fine-grained
control over the output size, and also makes sure that overwriting
existing textures works more cleanly.

(Also add some more useful bstr functions)
This commit is contained in:
Niklas Haas
2016-05-12 03:34:47 +02:00
parent 7c3d78fd82
commit 034faaa9d8
6 changed files with 238 additions and 24 deletions
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24
DOCS/man/vo.rst
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@@ -739,11 +739,20 @@ Available video output drivers are:
into. By default, this is set to the special name HOOKED which has
the effect of overwriting the hooked texture.
TRANSFORM sx sy ox oy
Specifies how this pass intends to transform the hooked texture.
``sx``/``sy`` refer to a linear scale factor, and ``ox``/``oy``
refer to a constant pixel shift that the shader will introduce. The
default values are 1 1 0 0 which leave the texture size unchanged.
WIDTH <szexpr>, HEIGHT <szexpr>
Specifies the size of the resulting texture for this pass.
``szexpr`` refers to an expression in RPN (reverse polish
notation), using the operators + - * /, floating point literals,
and references to existing texture sizes such as MAIN.width or
CHROMA.height. By default, these are set to HOOKED.w and HOOKED.h,
respectively.
OFFSET ox oy
Indicates a pixel shift (offset) introduced by this pass. These
pixel offsets will be accumulated and corrected during the
next scaling pass (``cscale`` or ``scale``). The default values
are 0 0 which correspond to no shift. Note that offsets are ignored
when not overwriting the hooked texture.
COMPONENTS n
Specifies how many components of this pass's output are relevant
@@ -810,8 +819,9 @@ Available video output drivers are:
The final output image, after color management but before
dithering and drawing to screen.
Only the textures labelled with (resizable) may be transformed by
the pass. For all others, the TRANSFORM must be 1 1 0 0 (default).
Only the textures labelled with ``resizable`` may be transformed by the
pass. When overwriting a texture marked ``fixed``, the WIDTH, HEIGHT
and OFFSET must be left at their default values.
``deband``
Enable the debanding algorithm. This greatly reduces the amount of