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gpu: allow choosing WGPU_BACKEND in example program

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Signed-off-by: Stephen Gutekanst <stephen@hexops.com>
This commit is contained in:
Stephen Gutekanst 2021-12-05 04:21:29 +00:00
parent 1fc499922f
commit 507f4fa6aa
1 changed files with 25 additions and 3 deletions
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28
gpu/src/dawn/sample_utils.zig
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@ -52,12 +52,36 @@ const Setup = struct {
}; };
fn detectBackendType() c.WGPUBackendType { fn detectBackendType() c.WGPUBackendType {
if (std.os.getenv("WGPU_BACKEND")) |backend| {
if (std.ascii.eqlIgnoreCase(backend, "opengl")) return c.WGPUBackendType_OpenGL;
if (std.ascii.eqlIgnoreCase(backend, "opengles")) return c.WGPUBackendType_OpenGLES;
if (std.ascii.eqlIgnoreCase(backend, "d3d11")) return c.WGPUBackendType_D3D11;
if (std.ascii.eqlIgnoreCase(backend, "d3d12")) return c.WGPUBackendType_D3D12;
if (std.ascii.eqlIgnoreCase(backend, "metal")) return c.WGPUBackendType_Metal;
if (std.ascii.eqlIgnoreCase(backend, "null")) return c.WGPUBackendType_Null;
if (std.ascii.eqlIgnoreCase(backend, "vulkan")) return c.WGPUBackendType_Vulkan;
@panic("unknown BACKEND type");
}
const target = @import("builtin").target; const target = @import("builtin").target;
if (target.isDarwin()) return c.WGPUBackendType_Metal; if (target.isDarwin()) return c.WGPUBackendType_Metal;
if (target.os.tag == .windows) return c.WGPUBackendType_D3D12; if (target.os.tag == .windows) return c.WGPUBackendType_D3D12;
return c.WGPUBackendType_Vulkan; return c.WGPUBackendType_Vulkan;
} }
fn backendTypeString(t: c.WGPUBackendType) []const u8 {
return switch (t) {
c.WGPUBackendType_OpenGL => "OpenGL",
c.WGPUBackendType_OpenGLES => "OpenGLES",
c.WGPUBackendType_D3D11 => "D3D11",
c.WGPUBackendType_D3D12 => "D3D12",
c.WGPUBackendType_Metal => "Metal",
c.WGPUBackendType_Null => "Null",
c.WGPUBackendType_Vulkan => "Vulkan",
else => unreachable,
};
}
pub fn setup() !Setup { pub fn setup() !Setup {
const backend_type = detectBackendType(); const backend_type = detectBackendType();
const cmd_buf_type = CmdBufType.none; const cmd_buf_type = CmdBufType.none;
@ -79,11 +103,9 @@ pub fn setup() !Setup {
const adapter = c.machDawnNativeAdapters_index(adapters, i); const adapter = c.machDawnNativeAdapters_index(adapters, i);
const properties = c.machDawnNativeAdapter_getProperties(adapter); const properties = c.machDawnNativeAdapter_getProperties(adapter);
if (c.machDawnNativeAdapterProperties_getBackendType(properties) == backend_type) { if (c.machDawnNativeAdapterProperties_getBackendType(properties) == backend_type) {
const vendor_id = c.machDawnNativeAdapterProperties_getVendorID(properties);
const device_id = c.machDawnNativeAdapterProperties_getDeviceID(properties);
const name = c.machDawnNativeAdapterProperties_getName(properties); const name = c.machDawnNativeAdapterProperties_getName(properties);
const driver_description = c.machDawnNativeAdapterProperties_getDriverDescription(properties); const driver_description = c.machDawnNativeAdapterProperties_getDriverDescription(properties);
std.debug.print("found adapter vendor_id={} device_id={} name={s} driver={s}\n", .{vendor_id, device_id, name, driver_description}); std.debug.print("found {s} adapter: {s}, {s}\n", .{ backendTypeString(backend_type), name, driver_description });
backend_adapter = adapter; backend_adapter = adapter;
} }
} }