Add support for fire textures in ANIMDEFS

[Cacodemon345]

This PR adds support for defining fire textures in ANIMDEFS.

Syntax is:
FIRETEXTURE tics

followed by a series of either "palette index" or "color red green blue alpha".

Example (converted from Legacy of Rust's SKYDEFS definition):

firetexture FIRETEST tics 2.00025
	palette 0
	palette 47
	palette 191
	palette 187
	palette 235
	palette 234
	palette 232
	palette 167
	palette 166
	palette 165
	palette 223
	palette 221
	palette 220
	palette 219
	palette 217
	palette 216
	palette 215
	palette 214
	palette 213
	palette 164
	palette 163
	palette 162
	palette 161
	palette 160
	palette 231
	palette 230
	palette 229
	palette 228
	palette 227
	palette 226
	palette 225
	palette 224

[coelckers]

Please make this work in the software renderer as well.

[Cacodemon345]

Is implementing Get8BitPixels enough for the software renderer? If so, it has been done now.

[prof-hastig]

Why don't you just test it?
Enabling both modes of the software renderer is not that hard...

[Cacodemon345]

It only works with the hardware renderer and the non-truecolor software renderer. On truecolor software renderer it remains frozen.

[prof-hastig]

My suggestion here would be to look how warped flats force their update and replicate it for this texture.

[Cacodemon345]

Fixed for truecolor software renderer.

[coelckers]

Hardware and paletted software renderer are working - but for the true color software renderer the black background is transparent and causes HOM.

Does this texture need the transparency for black? If not, make it fully opaque.

[Cacodemon345]

It needs the black parts to be fully transparent otherwise it will be rendered useless for dual sky parallax effects.

[Cacodemon345]

As an addendum: Specifying the first color with the color syntax with the alpha part maxed out (color 0 0 0 255) should disable transparency.

[coelckers]

It may be a bug in the true color software renderer, but I don't really know how to address it.

[Cacodemon345]

Does this happen with the sky or just linedefs? At least I could attempt fixing the truecolor sky renderer but I'm not sure about anything else.

[Cacodemon345]

It happens with the sky, not linedefs. I have no idea why it happens; the sky drawer code's not easy to read.

[Cacodemon345]

Defining an opaque black color as the first one indeed deals with the HOM problem.

[Cacodemon345]

The HOM problem should be addressed now.

[coelckers]

Seems to work now