This removes the fallback node from GskGLShaderNode and adds
a new function gsk_gl_shader_try_compile_for() which tries to compile a
shader against a renderer. Then you can use the return value of this
both as a way to implement the fallback, and as a way to get at
the error report in a saner way.
Print out the full assembled shader sources when
GSK_DEBUG=shaders is given. This is very verbose,
but may be useful to see what we actually pass
to the compiler.
Add adds a demo showing off GskGLShaderNode in various ways.
It has a transistion widget, using some examples from
gl-transitions.com, with child widgets being both images, a GL area
and real widgets (that let you edit the transition shaders
themselves.
It also has a fancy fire effect on hove on the buttons.
For vulkan/broadway this just means to ignore it, but for the gl
backend we support (with up to 4 texture inputs, which is similar to
what shadertoy does, so should be widely supported).
This is a rendernode that is supposed to run a GLSL fragment
shader with a set of inputs and produce outputs.
The inputs are:
* A GskGLShader object with the source and uniforms definitions
computed from the source.
* A the data for the uniforms, formated according to the GskGLShader
* a list of render nodes that are rendered to textures
Additionally there is a fallback node which is used in case
OpenGL is not supported or there is some kind of failure
with the shader code.
This adds a gsk prefix to the stuff in the preamble, as we want to
avoid it conflicting with things in the main shader. Especially once
we start allow some customization of shaders.
Almost always the source is created by combining various sources, which
means the line numbers in the error messages are hard to use. Adding
the line numbers to the source in the error message helps with this.
There is no real reason to have this on the side indexed via the
index, as it is stored next to each other anyway. Plus, storing them
together lets use use `Program` structures not in the array.
- Move padding from parent row to child cell.
- Align horizontal sizing of cell with header button.
- Properly support GtkColumnView:show-column-separators.
- Change cell height with and without .data-table.
This was showing up as tweak buttons being visible
when they should not. The code probably relied on
widgets being hidden by default (as they were in
GTK3).
Failure to do so makes the old pointer focus target
'sticky', because we end up ignoring the result of
picking the pointer focus until a motion event comes
in.
Fixes: #3172
