Refactor the chunk builder to use multithreading on native, but no threads on
wasm, at least until we have web workers or wasm threads. With this change
and the shader fix, chunks now render on Chrome (albeit with no textures).
Another step towards 🕸️ Web support #446.
* Single-threaded chunk builder
* shaders: chunk_frag: consistently enable outputs, fixes GL_INVALID_OPERATION on WebGL
At this point, the UI renders in the browser through WebGL, with no GL errors.
Progress towards #446🕸️ Web support
* main: enable render loop on wasm, disable events_loop on wasm for now
Allow for testing rendering on WebGL
* chunk_builder: disable on wasm due to no threads on wasm
Chunks will not be correctly rendered, but other parts of the program now can be tested instead of crashing in std::thread
* chunk_frag: glBindFragDataLocation is only on native, WebGL 2 uses in-shader specification layout(location=), which works on native in OpenGL 4.1 but we're on OpenGL 3.2 - see https://www.khronos.org/opengl/wiki/Fragment_Shader#Output_buffers
* std_or_web: always fail File::open() to avoid servers.json empty string JSON parse failing
* www: update installation instructions
* render: fix apparent TEXTURE_MAX_LEVEL -> TEXTURE_MAG_FILTER typo
* render: correct type for internalFormat DEPTH_COMPONENT24
Valid combinations of format, type, and internalFormat are listed at https://www.khronos.org/registry/OpenGL/specs/es/3.0/es_spec_3.0.pdf#page=124&zoom=100,168,206. We had UNSIGNED_BYTE for DEPTH_COMPONENT24, but only UNSIGNED_INT is a valid type for this internal format.
Fixes texImage: Mismatched internalFormat and format/type: 0x81a6 and 0x1902/0x1401
and fixes the subsequent GL_FRAMEBUFFER_INCOMPLETE_ATTACHMENT error.
* render: gl::MULTISAMPLE (0x809d) is not available on WebGL
Fixes WebGL warning: enabled: cap: Invalid enum value <enum 0x809d> 0.bootstrap.js line 11 > eval:851:21
* gl: replace set_float_multi_raw with a safer set_float_multi
Removes use of passing raw pointers in set_float_multi_raw parameters
Instead, casts raw pointers to flatten, similar to set_matrix_multi
Fixes uniform setter: (uniform colorMul[0]) values length (1) must be a positive integer multiple of size of <enum 0x8b52>.
* render: model: send BYTE to id attrib, fixes type mismatch
Fixes drawElementsInstanced: Vertex attrib 0 requires data of type INT, but is being supplied with type UINT
ice_iix