feat(vulkan): vulkan 1.4 core with the user interface and the launcher, shaders split into ogl46/vk14 with SPIR-V binaries loaded first

shaders/depthprepass_alpha.frag

@@ -1,16 +0,0 @@
-// depth prepass of materials whose colour shader tests the alpha of the diffuse texture against the opacity of the
-// material (mat_default.frag and the like). the test here is stricter by one step of 8-bit alpha: a fragment which writes
-// depth here is never discarded by the colour pass, which would leave a hole with nothing drawn behind it
-
-in vec2 f_coord;
-
-#include <common>
-
-#texture (diffuse, 0, sRGB_A)
-uniform sampler2D diffuse;
-
-void main()
-{
-	if (texture(diffuse, f_coord).a < opacity + 1.0 / 255.0)
-		discard;
-}