On Thursday, 19 September 2019 at 23:32:13 UTC, norm wrote:
On Thursday, 19 September 2019 at 20:47:45 UTC, Shadowblitz16
wrote:
[...]
I'd create a fragment shader to convert each pixel to 8 bit.
There are many examples on the web about creating fragment
shaders and 2d opengl scenes, i.e. a 2d scene where OpenGL
coordinates are integer pixel coordinates. Once you get that
you then just implement the conversion routine.
Using the shader you can render the image as a textured quad
and send the colour look up table down as an additional 1d
texture. This way you can have several D arrays for each colour
table and simply swap the texture buffer pointer to instantly
switch colours.
You can also get cool effects this way when you move to 3d
using 8 bit colour tables.
the issue with using openGL is its complex and hard to get
working with a widget library
