add f32color.RGBA

Signed-off-by: Egon Elbre <egonelbre@gmail.com>

app/internal/d3d11/backend_windows.go

@@ -10,6 +10,7 @@ import (
 	"unsafe"
 
 	"gioui.org/gpu/backend"
+	"gioui.org/internal/f32color"
 	gunsafe "gioui.org/internal/unsafe"
 	"golang.org/x/sys/windows"
 )
@@ -26,7 +27,7 @@ type Device struct {
 }
 
 type Backend struct {
-	clearColor [4]float32
+	clearColor f32color.RGBA
 	clearDepth float32
 	viewport   _D3D11_VIEWPORT
 	depthState depthState
@@ -539,7 +540,7 @@ func (b *Backend) NewProgram(vertexShader, fragmentShader backend.ShaderSources)
 }
 
 func (b *Backend) ClearColor(colr, colg, colb, cola float32) {
-	b.clearColor = [...]float32{colr, colg, colb, cola}
+	b.clearColor = f32color.RGBA{R: colr, G: colg, B: colb, A: cola}
 }
 
 func (b *Backend) Clear(buffers backend.BufferAttachments) {

app/internal/d3d11/d3d11_windows.go

@@ -5,9 +5,10 @@ package d3d11
 import (
 	"fmt"
 	"math"
+	"syscall"
 	"unsafe"
 
-	"syscall"
+	"gioui.org/internal/f32color"
 
 	"golang.org/x/sys/windows"
 )
@@ -1033,7 +1034,7 @@ func (c *_ID3D11DeviceContext) ClearDepthStencilView(target *_ID3D11DepthStencil
 	)
 }
 
-func (c *_ID3D11DeviceContext) ClearRenderTargetView(target *_ID3D11RenderTargetView, color *[4]float32) {
+func (c *_ID3D11DeviceContext) ClearRenderTargetView(target *_ID3D11RenderTargetView, color *f32color.RGBA) {
 	syscall.Syscall(
 		c.vtbl.ClearRenderTargetView,
 		3,
@@ -1243,7 +1244,7 @@ func (c *_ID3D11DeviceContext) DrawIndexed(count, start uint32, base int32) {
 	)
 }
 
-func (c *_ID3D11DeviceContext) OMSetBlendState(state *_ID3D11BlendState, factor *[4]float32, sampleMask uint32) {
+func (c *_ID3D11DeviceContext) OMSetBlendState(state *_ID3D11BlendState, factor *f32color.RGBA, sampleMask uint32) {
 	syscall.Syscall6(
 		c.vtbl.OMSetBlendState,
 		4,