cube example with gl backend panics

[m4b]

attempting to run cube example for gl backend panics:

cargo run --example cube --features gl
thread 'main' panicked at 'not yet implemented', /home/m4b/.cargo/registry/src/gh.neting.cc-1ecc6299db9ec823/gfx-backend-gl-0.2.0/src/window/glutin.rs:184:18
note: Run with `RUST_BACKTRACE=1` environment variable to display a backtrace.

Which is:

    pub(crate) fn create_swapchain_impl(
        &self,
        surface: &mut Surface,
        config: hal::SwapchainConfig,
    ) -> (Swapchain, Vec<native::Image>) {
        let swapchain = Swapchain {
            extent: config.extent,
            window: surface.window.clone(),
        };

        let gl = &self.share.context;

        let (int_format, iformat, itype) = match config.format {
            f::Format::Rgba8Unorm => (gl::RGBA8, gl::RGBA, gl::UNSIGNED_BYTE),
            f::Format::Rgba8Srgb => (gl::SRGB8_ALPHA8, gl::RGBA, gl::UNSIGNED_BYTE),
            _ => unimplemented!(),
        };

This may be fixed in more up to date gfx gl backend, not sure. I think it can also be fixed by changing the swapchain format to Rgba8Unorm

[m4b]

Fixing the swapchain format as I suggest above lets us progress past that point, but still panics with:

m4b@efrit ::  [ ~/git/wgpu-rs ] RUST_BACKTRACE=1 cargo run --example cube --features gl
    Finished dev [unoptimized + debuginfo] target(s) in 0.18s
     Running `target/debug/examples/cube`
thread 'main' panicked at 'No buffer has been bound yet, can't map memory!', /home/m4b/.cargo/registry/src/gh.neting.cc-1ecc6299db9ec823/gfx-backend-gl-0.2.0/src/device.rs:1148:18
stack backtrace:
   0: std::sys::unix::backtrace::tracing::imp::unwind_backtrace
             at src/libstd/sys/unix/backtrace/tracing/gcc_s.rs:39
   1: std::sys_common::backtrace::_print
             at src/libstd/sys_common/backtrace.rs:71
   2: std::panicking::default_hook::{{closure}}
             at src/libstd/sys_common/backtrace.rs:59
             at src/libstd/panicking.rs:197
   3: std::panicking::default_hook
             at src/libstd/panicking.rs:211
   4: std::panicking::rust_panic_with_hook
             at src/libstd/panicking.rs:474
   5: std::panicking::begin_panic
             at /rustc/3c235d5600393dfe6c36eeed34042efad8d4f26e/src/libstd/panicking.rs:408
   6: <gfx_backend_gl::device::Device as gfx_hal::device::Device<gfx_backend_gl::Backend>>::map_memory
             at /home/m4b/.cargo/git/checkouts/wgpu-53e70f8674b08dd4/32399cf/wgpu-native/<::std::macros::panic macros>:3
   7: rendy_memory::allocator::dynamic::DynamicAllocator<B>::alloc_chunk_from_device
             at /home/m4b/.cargo/registry/src/gh.neting.cc-1ecc6299db9ec823/rendy-memory-0.3.0/src/allocator/dynamic.rs:260
   8: rendy_memory::allocator::dynamic::DynamicAllocator<B>::alloc_chunk
             at /home/m4b/.cargo/registry/src/gh.neting.cc-1ecc6299db9ec823/rendy-memory-0.3.0/src/allocator/dynamic.rs:300
   9: rendy_memory::allocator::dynamic::DynamicAllocator<B>::alloc_from_entry
             at /home/m4b/.cargo/registry/src/gh.neting.cc-1ecc6299db9ec823/rendy-memory-0.3.0/src/allocator/dynamic.rs:384
  10: rendy_memory::allocator::dynamic::DynamicAllocator<B>::alloc_block
             at /home/m4b/.cargo/registry/src/gh.neting.cc-1ecc6299db9ec823/rendy-memory-0.3.0/src/allocator/dynamic.rs:426
  11: rendy_memory::allocator::dynamic::DynamicAllocator<B>::alloc_chunk
             at /home/m4b/.cargo/registry/src/gh.neting.cc-1ecc6299db9ec823/rendy-memory-0.3.0/src/allocator/dynamic.rs:317
  12: rendy_memory::allocator::dynamic::DynamicAllocator<B>::alloc_from_entry
             at /home/m4b/.cargo/registry/src/gh.neting.cc-1ecc6299db9ec823/rendy-memory-0.3.0/src/allocator/dynamic.rs:384
  13: rendy_memory::allocator::dynamic::DynamicAllocator<B>::alloc_block
             at /home/m4b/.cargo/registry/src/gh.neting.cc-1ecc6299db9ec823/rendy-memory-0.3.0/src/allocator/dynamic.rs:426
  14: rendy_memory::allocator::dynamic::DynamicAllocator<B>::alloc_chunk
             at /home/m4b/.cargo/registry/src/gh.neting.cc-1ecc6299db9ec823/rendy-memory-0.3.0/src/allocator/dynamic.rs:317
  15: rendy_memory::allocator::dynamic::DynamicAllocator<B>::alloc_from_entry
             at /home/m4b/.cargo/registry/src/gh.neting.cc-1ecc6299db9ec823/rendy-memory-0.3.0/src/allocator/dynamic.rs:384
  16: rendy_memory::allocator::dynamic::DynamicAllocator<B>::alloc_block
             at /home/m4b/.cargo/registry/src/gh.neting.cc-1ecc6299db9ec823/rendy-memory-0.3.0/src/allocator/dynamic.rs:426
  17: rendy_memory::allocator::dynamic::DynamicAllocator<B>::alloc_chunk
             at /home/m4b/.cargo/registry/src/gh.neting.cc-1ecc6299db9ec823/rendy-memory-0.3.0/src/allocator/dynamic.rs:317
  18: rendy_memory::allocator::dynamic::DynamicAllocator<B>::alloc_from_entry
             at /home/m4b/.cargo/registry/src/gh.neting.cc-1ecc6299db9ec823/rendy-memory-0.3.0/src/allocator/dynamic.rs:384
  19: rendy_memory::allocator::dynamic::DynamicAllocator<B>::alloc_block
             at /home/m4b/.cargo/registry/src/gh.neting.cc-1ecc6299db9ec823/rendy-memory-0.3.0/src/allocator/dynamic.rs:426
  20: <rendy_memory::allocator::dynamic::DynamicAllocator<B> as rendy_memory::allocator::Allocator<B>>::alloc
             at /home/m4b/.cargo/registry/src/gh.neting.cc-1ecc6299db9ec823/rendy-memory-0.3.0/src/allocator/dynamic.rs:519
  21: rendy_memory::heaps::memory_type::MemoryType<B>::alloc_impl
             at /home/m4b/.cargo/registry/src/gh.neting.cc-1ecc6299db9ec823/rendy-memory-0.3.0/src/heaps/memory_type.rs:82
  22: rendy_memory::heaps::memory_type::MemoryType<B>::alloc
             at /home/m4b/.cargo/registry/src/gh.neting.cc-1ecc6299db9ec823/rendy-memory-0.3.0/src/heaps/memory_type.rs:63
  23: rendy_memory::heaps::Heaps<B>::allocate_from
             at /home/m4b/.cargo/registry/src/gh.neting.cc-1ecc6299db9ec823/rendy-memory-0.3.0/src/heaps/mod.rs:173
  24: rendy_memory::heaps::Heaps<B>::allocate
             at /home/m4b/.cargo/registry/src/gh.neting.cc-1ecc6299db9ec823/rendy-memory-0.3.0/src/heaps/mod.rs:141
  25: wgpu_native::device::device_create_buffer
             at /home/m4b/.cargo/git/checkouts/wgpu-53e70f8674b08dd4/32399cf/wgpu-native/src/device.rs:614
  26: wgpu_device_create_buffer_mapped
             at /home/m4b/.cargo/git/checkouts/wgpu-53e70f8674b08dd4/32399cf/wgpu-native/src/device.rs:684
  27: wgpu::Device::create_buffer_mapped
             at ./src/lib.rs:759
  28: <cube::Example as cube::framework::Example>::init
             at examples/cube/main.rs:118
  29: cube::framework::run
             at examples/cube/../framework.rs:121
  30: cube::main
             at examples/cube/main.rs:351
  31: std::rt::lang_start::{{closure}}
             at /rustc/3c235d5600393dfe6c36eeed34042efad8d4f26e/src/libstd/rt.rs:64
  32: std::panicking::try::do_call
             at src/libstd/rt.rs:49
             at src/libstd/panicking.rs:293
  33: __rust_maybe_catch_panic
             at src/libpanic_unwind/lib.rs:87
  34: std::rt::lang_start_internal
             at src/libstd/panicking.rs:272
             at src/libstd/panic.rs:388
             at src/libstd/rt.rs:48
  35: std::rt::lang_start
             at /rustc/3c235d5600393dfe6c36eeed34042efad8d4f26e/src/libstd/rt.rs:64
  36: main
  37: __libc_start_main
  38: _start

[m4b]

Oops, I filed this in wgpu-native, not wgpu-rs, not sure if this is the right place (though the error does look to be a wgpu-native issue w.r.t. rendy usage?) anyway i'm tired, feel free to refile over in wgpu-rs and close here if necessary :)

[kvark]

@m4b thanks for filing!

Oops, I filed this in wgpu-native, not wgpu-rs, not sure if this is the right place

It's the problem here in wgpu-native. You filed to the right repo. FWIW, github provides an ability to move issues around, so it's not a big problem to move when needed.

No buffer has been bound yet, can't map memory!

I think this was fixed in gfx-rs/gfx#2822

The patched GL backend hasn't been released (and the fixes weren't back-ported) yet.

[grovesNL]

With #3466 this should be working again