app/internal/d3d11: detect hardware floating point support

Signed-off-by: Elias Naur <mail@eliasnaur.com>

app/internal/d3d11/d3d11_windows.go

@@ -565,6 +565,11 @@ const (
 	_DXGI_FORMAT_R8G8B8A8_UNORM_SRGB = 29
 	_DXGI_FORMAT_R16_SINT            = 59
 	_DXGI_FORMAT_R16G16_SINT         = 38
+	_DXGI_FORMAT_R16_UINT            = 57
+	_DXGI_FORMAT_D24_UNORM_S8_UINT   = 45
+
+	_D3D11_FORMAT_SUPPORT_TEXTURE2D     = 0x20
+	_D3D11_FORMAT_SUPPORT_RENDER_TARGET = 0x4000
 
 	_DXGI_USAGE_RENDER_TARGET_OUTPUT = 1 << (1 + 4)
 
@@ -574,8 +579,6 @@ const (
 
 	_DXGI_SWAP_EFFECT_DISCARD = 0
 
-	_DXGI_FORMAT_R16_UINT = 57
-
 	_D3D_FEATURE_LEVEL_9_1  = 0x9100
 	_D3D_FEATURE_LEVEL_9_3  = 0x9300
 	_D3D_FEATURE_LEVEL_11_0 = 0xb000
@@ -611,8 +614,6 @@ const (
 	_D3D11_CLEAR_DEPTH   = 0x1
 	_D3D11_CLEAR_STENCIL = 0x2
 
-	_DXGI_FORMAT_D24_UNORM_S8_UINT = 45
-
 	_D3D11_DSV_DIMENSION_TEXTURE2D = 3
 
 	_D3D11_DEPTH_WRITE_MASK_ALL = 1
@@ -685,6 +686,21 @@ func _D3D11CreateDeviceAndSwapChain(driverType uint32, flags uint32, swapDesc *_
 	return dev, ctx, swchain, featLvl, nil
 }
 
+func (d *_ID3D11Device) CheckFormatSupport(format uint32) (uint32, error) {
+	var support uint32
+	r, _, _ := syscall.Syscall(
+		d.vtbl.CheckFormatSupport,
+		3,
+		uintptr(unsafe.Pointer(d)),
+		uintptr(format),
+		uintptr(unsafe.Pointer(&support)),
+	)
+	if r != 0 {
+		return 0, ErrorCode{Name: "ID3D11DeviceCheckFormatSupport", Code: uint32(r)}
+	}
+	return support, nil
+}
+
 func (d *_ID3D11Device) CreateBuffer(desc *_D3D11_BUFFER_DESC, data []byte) (*_ID3D11Buffer, error) {
 	var dataDesc *_D3D11_SUBRESOURCE_DATA
 	if len(data) > 0 {