gpu: drop access flags and format from driver.Device.BindImageTexture

They can be deferred in the drivers that need them.

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

gpu/compute.go

@@ -1278,12 +1278,12 @@ func (g *compute) render(images *textureAtlas, dst driver.Texture, cpuDst cpu.Im
 
 		if !g.useCPU {
 			g.ctx.BeginCompute()
-			g.ctx.BindImageTexture(kernel4OutputUnit, dst, driver.AccessWrite, driver.TextureFormatRGBA8)
+			g.ctx.BindImageTexture(kernel4OutputUnit, dst)
 			img := g.output.nullMaterials
 			if images != nil {
 				img = images.image
 			}
-			g.ctx.BindImageTexture(kernel4AtlasUnit, img, driver.AccessRead, driver.TextureFormatRGBA8)
+			g.ctx.BindImageTexture(kernel4AtlasUnit, img)
 		} else {
 			*g.output.descriptors.Binding2() = cpuDst
 			if images != nil {

gpu/internal/d3d11/d3d11_windows.go

@@ -582,12 +582,12 @@ func (b *Backend) prepareDraw() {
 	b.ctx.IASetPrimitiveTopology(topology)
 }
 
-func (b *Backend) BindImageTexture(unit int, tex driver.Texture, access driver.AccessBits, f driver.TextureFormat) {
+func (b *Backend) BindImageTexture(unit int, tex driver.Texture) {
 	t := tex.(*Texture)
-	if access&driver.AccessWrite == 0 {
-		b.ctx.CSSetShaderResources(uint32(unit), t.resView)
-	} else {
+	if t.uaView != nil {
 		b.ctx.CSSetUnorderedAccessViews(uint32(unit), t.uaView)
+	} else {
+		b.ctx.CSSetShaderResources(uint32(unit), t.resView)
 	}
 }
 

gpu/internal/driver/driver.go

@@ -42,7 +42,7 @@ type Device interface {
 	BindTexture(unit int, t Texture)
 	BindVertexBuffer(b Buffer, offset int)
 	BindIndexBuffer(b Buffer)
-	BindImageTexture(unit int, texture Texture, access AccessBits, format TextureFormat)
+	BindImageTexture(unit int, texture Texture)
 	BindUniforms(buf Buffer)
 	BindStorageBuffer(binding int, buf Buffer)
 
@@ -91,8 +91,6 @@ type BlendDesc struct {
 	SrcFactor, DstFactor BlendFactor
 }
 
-type AccessBits uint8
-
 type BlendFactor uint8
 
 type Topology uint8
@@ -164,11 +162,6 @@ const (
 	TextureFormatOutput
 )
 
-const (
-	AccessRead AccessBits = 1 << iota
-	AccessWrite
-)
-
 const (
 	FilterNearest TextureFilter = iota
 	FilterLinear

gpu/internal/metal/metal_darwin.go

@@ -814,7 +814,7 @@ func primitiveFor(mode driver.Topology) C.MTLPrimitiveType {
 	}
 }
 
-func (b *Backend) BindImageTexture(unit int, tex driver.Texture, access driver.AccessBits, f driver.TextureFormat) {
+func (b *Backend) BindImageTexture(unit int, tex driver.Texture) {
 	b.BindTexture(unit, tex)
 }
 

gpu/internal/opengl/opengl.go

@@ -96,14 +96,15 @@ type timer struct {
 }
 
 type texture struct {
-	backend *Backend
-	obj     gl.Texture
-	fbo     gl.Framebuffer
-	hasFBO  bool
-	triple  textureTriple
-	width   int
-	height  int
-	foreign bool
+	backend  *Backend
+	obj      gl.Texture
+	fbo      gl.Framebuffer
+	hasFBO   bool
+	triple   textureTriple
+	width    int
+	height   int
+	bindings driver.BufferBinding
+	foreign  bool
 }
 
 type pipeline struct {
@@ -675,7 +676,7 @@ func (t *texture) ensureFBO() gl.Framebuffer {
 
 func (b *Backend) NewTexture(format driver.TextureFormat, width, height int, minFilter, magFilter driver.TextureFilter, binding driver.BufferBinding) (driver.Texture, error) {
 	glErr(b.funcs)
-	tex := &texture{backend: b, obj: b.funcs.CreateTexture(), width: width, height: height}
+	tex := &texture{backend: b, obj: b.funcs.CreateTexture(), width: width, height: height, bindings: binding}
 	switch format {
 	case driver.TextureFormatFloat:
 		tex.triple = b.floatTriple
@@ -772,27 +773,20 @@ func (b *Backend) DispatchCompute(x, y, z int) {
 	b.funcs.DispatchCompute(x, y, z)
 }
 
-func (b *Backend) BindImageTexture(unit int, tex driver.Texture, access driver.AccessBits, f driver.TextureFormat) {
+func (b *Backend) BindImageTexture(unit int, tex driver.Texture) {
 	t := tex.(*texture)
 	var acc gl.Enum
-	switch access {
-	case driver.AccessWrite:
-		acc = gl.WRITE_ONLY
-	case driver.AccessRead:
+	switch t.bindings & (driver.BufferBindingShaderStorageRead | driver.BufferBindingShaderStorageWrite) {
+	case driver.BufferBindingShaderStorageRead:
 		acc = gl.READ_ONLY
-	case driver.AccessRead | driver.AccessWrite:
+	case driver.BufferBindingShaderStorageWrite:
+		acc = gl.WRITE_ONLY
+	case driver.BufferBindingShaderStorageRead | driver.BufferBindingShaderStorageWrite:
 		acc = gl.READ_WRITE
 	default:
 		panic("unsupported access bits")
 	}
-	var format gl.Enum
-	switch f {
-	case driver.TextureFormatRGBA8:
-		format = gl.RGBA8
-	default:
-		panic("unsupported format")
-	}
-	b.funcs.BindImageTexture(unit, t.obj, 0, false, 0, acc, format)
+	b.funcs.BindImageTexture(unit, t.obj, 0, false, 0, acc, t.triple.internalFormat)
 }
 
 func (b *Backend) BlendFunc(sfactor, dfactor driver.BlendFactor) {