* engine: common: imagelib: add KTX2 support
Adds basic KTX2 support for a few compressed formats. KTX2 essentially
is a Vulkan-centric texture format that supports literally hundreds of
pixel formats.
For now only support for these is added:
- `VK_FORMAT_BC4_UNORM_BLOCK`
- `VK_FORMAT_BC4_SNORM_BLOCK`
- `VK_FORMAT_BC5_UNORM_BLOCK`
- `VK_FORMAT_BC5_SNORM_BLOCK`
- `VK_FORMAT_BC6H_UFLOAT_BLOCK`
- `VK_FORMAT_BC6H_SFLOAT_BLOCK`
- `VK_FORMAT_BC7_UNORM_BLOCK`
- `VK_FORMAT_BC7_SRGB_BLOCK`
Adding more formats is relatively straightforward:
- Copy format definition from `VkFormat` enum in `vulkan_core.h`
- Add a new definition into `pixformat_t` enum.
- Add format size calculation into `Image_ComputeSize()`
While we're at it, also adds a few new formats to DDS:
- BC4_UNORM -- PF_BC4_UNSIGNED
- BC4_SNORM -- PF_BC4_SIGNED
- BC5_UNORM -- PF_BC5_UNSIGNED
- BC5_SNORM -- PF_BC5_SIGNED
- BC7 is expanded into BC7_UNORM and BC7_SRGB
ref_gl and ref_soft code is updated where it made sense. But not tested
really. Support for these formats has been tested with ref_vk.
* address spaces-vs-parentheses formatting where noticed
* parenthesize sizeofs
* move ktx2.h to imagelib as img_ktx2.h; massage it a bit
* use SetBits() instead of |=
* remove stale TODO comments
* Added definitions for IRIX
* Patchset to get dedicated server to compile on IRIX.
* Cleaned up debug statements in wscript
* Potential bug in IRIX implementation of isnan? For now just use the portable macro.
* Include the platform port files in the build
* Temporary execution script for setting appropriate library search paths to the right locations in the build directory. This should probably get replaced with a more permanent script at some point which lives in the same directory as the normal xash binary, or be replaced by a solution that sets the rpath during config or modifies rpath during install.
* Clean up formatting and remove unneeded debugging statements
* Added GPL copyright notice and description
* Moved to irix platform folder and edited script
* Re-introduced _inline macro
* Replace spaces with tabs
Co-authored-by: Xav101 <xaviernye@msn.com>
higher part used for client sprites
map overview sprites are loaded as normal models
thus we have equal internal engine and hud sprite indices and it fixes compatibility issues
for mods like Half-Rats Parasomnia
