shaderprecomp: remove ShaderSourceID

`ShaderSourceID` was confusing as there was no guarantee the same ID is
used for the same source if Ebitengine versions are different.

`ShaderSource` should be kept as the built-in shader contents should not
be exposed.

Updates #2861
Closes #2999

examples/shaderprecomp/fxc/gen.go

@@ -40,7 +40,7 @@ func run() error {
 		if errors.Is(err, exec.ErrNotFound) {
 			fmt.Fprintln(os.Stderr, "fxc.exe not found. Please install Windows SDK.")
 			fmt.Fprintln(os.Stderr, "See https://learn.microsoft.com/en-us/windows/win32/direct3dtools/fxc for more details.")
-			fmt.Fprintln(os.Stderr, "On PowerShell, you can add a path to the PATH environment variable temporarily like:")
+			fmt.Fprintln(os.Stderr, "HINT: On PowerShell, you can add a path to the PATH environment variable temporarily like:")
 			fmt.Fprintln(os.Stderr)
 			fmt.Fprintln(os.Stderr, `    & (Get-Process -Id $PID).Path { $env:PATH="C:\Program Files (x86)\Windows Kits\10\bin\10.0.22621.0\x64;"+$env:PATH; go generate .\examples\shaderprecomp\fxc\ }`)
 			fmt.Fprintln(os.Stderr)
@@ -61,33 +61,27 @@ func run() error {
 	if err != nil {
 		return err
 	}
-	defaultSrc, err := shaderprecomp.NewShaderSource(defaultSrcBytes)
-	if err != nil {
-		return err
-	}
-	srcs = append(srcs, defaultSrc)
+	srcs = append(srcs, shaderprecomp.NewShaderSource(defaultSrcBytes))
 
-	for _, src := range srcs {
+	for i, src := range srcs {
 		// Avoid using errgroup.Group.
 		// Compiling sources in parallel causes a mixed error message on the console.
-		if err := compile(src, tmpdir); err != nil {
+		if err := compile(src, i, tmpdir); err != nil {
 			return err
 		}
 	}
 	return nil
 }
 
-func generateHSLSFiles(source *shaderprecomp.ShaderSource, tmpdir string) (vs, ps string, err error) {
-	id := source.ID().String()
-
-	vsHLSLFilePath := filepath.Join(tmpdir, id+"_vs.hlsl")
+func generateHSLSFiles(source *shaderprecomp.ShaderSource, index int, tmpdir string) (vs, ps string, err error) {
+	vsHLSLFilePath := filepath.Join(tmpdir, fmt.Sprintf("%d_vs.hlsl", index))
 	vsf, err := os.Create(vsHLSLFilePath)
 	if err != nil {
 		return "", "", err
 	}
 	defer vsf.Close()
 
-	psHLSLFilePath := filepath.Join(tmpdir, id+"_ps.hlsl")
+	psHLSLFilePath := filepath.Join(tmpdir, fmt.Sprintf("%d_ps.hlsl", index))
 	psf, err := os.Create(psHLSLFilePath)
 	if err != nil {
 		return "", "", err
@@ -101,25 +95,23 @@ func generateHSLSFiles(source *shaderprecomp.ShaderSource, tmpdir string) (vs, p
 	return vsHLSLFilePath, psHLSLFilePath, nil
 }
 
-func compile(source *shaderprecomp.ShaderSource, tmpdir string) error {
+func compile(source *shaderprecomp.ShaderSource, index int, tmpdir string) error {
 	// Generate HLSL files. Make sure this process doesn't have any handlers of the files.
 	// Without closing the files, fxc.exe cannot access the files.
-	vsHLSLFilePath, psHLSLFilePath, err := generateHSLSFiles(source, tmpdir)
+	vsHLSLFilePath, psHLSLFilePath, err := generateHSLSFiles(source, index, tmpdir)
 	if err != nil {
 		return err
 	}
 
-	id := source.ID().String()
-
-	vsFXCFilePath := id + "_vs.fxc"
+	vsFXCFilePath := fmt.Sprintf("%d_vs.fxc", index)
 	cmd := exec.Command("fxc.exe", "/nologo", "/O3", "/T", shaderprecomp.HLSLVertexShaderProfile, "/E", shaderprecomp.HLSLVertexShaderEntryPoint, "/Fo", vsFXCFilePath, vsHLSLFilePath)
 	cmd.Stdout = os.Stdout
 	cmd.Stderr = os.Stderr
 	if err := cmd.Run(); err != nil {
 		return err
 	}
 
-	psFXCFilePath := id + "_ps.fxc"
+	psFXCFilePath := fmt.Sprintf("%d_ps.fxc", index)
 	cmd = exec.Command("fxc.exe", "/nologo", "/O3", "/T", shaderprecomp.HLSLPixelShaderProfile, "/E", shaderprecomp.HLSLPixelShaderEntryPoint, "/Fo", psFXCFilePath, psHLSLFilePath)
 	cmd.Stdout = os.Stdout
 	cmd.Stderr = os.Stderr

examples/shaderprecomp/metallib/gen.go

@@ -20,6 +20,7 @@
 package main
 
 import (
+	"fmt"
 	"os"
 	"os/exec"
 	"path/filepath"
@@ -46,26 +47,20 @@ func run() error {
 	if err != nil {
 		return err
 	}
-	defaultSrc, err := shaderprecomp.NewShaderSource(defaultSrcBytes)
-	if err != nil {
-		return err
-	}
-	srcs = append(srcs, defaultSrc)
+	srcs = append(srcs, shaderprecomp.NewShaderSource(defaultSrcBytes))
 
-	for _, src := range srcs {
+	for i, src := range srcs {
 		// Avoid using errgroup.Group.
 		// Compiling sources in parallel causes a mixed error message on the console.
-		if err := compile(src, tmpdir); err != nil {
+		if err := compile(src, i, tmpdir); err != nil {
 			return err
 		}
 	}
 	return nil
 }
 
-func compile(source *shaderprecomp.ShaderSource, tmpdir string) error {
-	id := source.ID().String()
-
-	metalFilePath := filepath.Join(tmpdir, id+".metal")
+func compile(source *shaderprecomp.ShaderSource, index int, tmpdir string) error {
+	metalFilePath := filepath.Join(tmpdir, fmt.Sprintf("%d.metal", index))
 
 	f, err := os.Create(metalFilePath)
 	if err != nil {
@@ -80,14 +75,14 @@ func compile(source *shaderprecomp.ShaderSource, tmpdir string) error {
 		return err
 	}
 
-	irFilePath := filepath.Join(tmpdir, id+".ir")
+	irFilePath := filepath.Join(tmpdir, fmt.Sprintf("%d.ir", index))
 	cmd := exec.Command("xcrun", "-sdk", "macosx", "metal", "-o", irFilePath, "-c", metalFilePath)
 	cmd.Stderr = os.Stderr
 	if err := cmd.Run(); err != nil {
 		return err
 	}
 
-	metallibFilePath := id + ".metallib"
+	metallibFilePath := fmt.Sprintf("%d.metallib", index)
 	cmd = exec.Command("xcrun", "-sdk", "macosx", "metallib", "-o", metallibFilePath, irFilePath)
 	cmd.Stderr = os.Stderr
 	if err := cmd.Run(); err != nil {

examples/shaderprecomp/register_darwin.go

@@ -29,14 +29,10 @@ var metallibs embed.FS
 
 func registerPrecompiledShaders() error {
 	srcs := shaderprecomp.AppendBuildinShaderSources(nil)
-	defaultShaderSource, err := shaderprecomp.NewShaderSource(defaultShaderSourceBytes)
-	if err != nil {
-		return err
-	}
-	srcs = append(srcs, defaultShaderSource)
+	srcs = append(srcs, shaderprecomp.NewShaderSource(defaultShaderSourceBytes))
 
-	for _, src := range srcs {
-		name := src.ID().String() + ".metallib"
+	for i, src := range srcs {
+		name := fmt.Sprintf("%d.metallib", i)
 		lib, err := metallibs.ReadFile("metallib/" + name)
 		if err != nil {
 			if errors.Is(err, fs.ErrNotExist) {

examples/shaderprecomp/register_windows.go

@@ -31,14 +31,10 @@ var fxcs embed.FS
 
 func registerPrecompiledShaders() error {
 	srcs := shaderprecomp.AppendBuildinShaderSources(nil)
-	defaultShaderSource, err := shaderprecomp.NewShaderSource(defaultShaderSourceBytes)
-	if err != nil {
-		return err
-	}
-	srcs = append(srcs, defaultShaderSource)
+	srcs = append(srcs, shaderprecomp.NewShaderSource(defaultShaderSourceBytes))
 
-	for _, src := range srcs {
-		vsname := src.ID().String() + "_vs.fxc"
+	for i, src := range srcs {
+		vsname := fmt.Sprintf("%d_vs.fxc", i)
 		vs, err := fxcs.ReadFile("fxc/" + vsname)
 		if err != nil {
 			if errors.Is(err, fs.ErrNotExist) {
@@ -48,7 +44,7 @@ func registerPrecompiledShaders() error {
 			return err
 		}
 
-		psname := src.ID().String() + "_ps.fxc"
+		psname := fmt.Sprintf("%d_ps.fxc", i)
 		ps, err := fxcs.ReadFile("fxc/" + psname)
 		if err != nil {
 			if errors.Is(err, fs.ErrNotExist) {

internal/graphicsdriver/directx/shader_windows.go

@@ -70,8 +70,8 @@ func (c *precompiledFXCs) get(hash shaderir.SourceHash) ([]byte, []byte) {
 
 var thePrecompiledFXCs precompiledFXCs
 
-func RegisterPrecompiledFXCs(hash shaderir.SourceHash, vertex, pixel []byte) {
-	thePrecompiledFXCs.put(hash, vertex, pixel)
+func RegisterPrecompiledFXCs(source []byte, vertex, pixel []byte) {
+	thePrecompiledFXCs.put(shaderir.CalcSourceHash(source), vertex, pixel)
 }
 
 var vertexShaderCache = map[string]*_ID3DBlob{}

internal/graphicsdriver/metal/shader_darwin.go

@@ -51,8 +51,8 @@ func (c *precompiledLibraries) get(hash shaderir.SourceHash) []byte {
 
 var thePrecompiledLibraries precompiledLibraries
 
-func RegisterPrecompiledLibrary(hash shaderir.SourceHash, bin []byte) {
-	thePrecompiledLibraries.put(hash, bin)
+func RegisterPrecompiledLibrary(source []byte, bin []byte) {
+	thePrecompiledLibraries.put(shaderir.CalcSourceHash(source), bin)
 }
 
 type shaderRpsKey struct {

internal/graphicsdriver/playstation5/shader_paystation5.go

@@ -18,10 +18,6 @@
 
 package playstation5
 
-import (
-	"github.com/hajimehoshi/ebiten/v2/internal/shaderir"
-)
-
-func RegisterPrecompiledShaders(hash shaderir.SourceHash, vertex, pixel []byte) {
+func RegisterPrecompiledShaders(source []byte, vertex, pixel []byte) {
 	// TODO: Implement this.
 }

shaderprecomp/shaderprecomp.go

@@ -16,8 +16,6 @@ package shaderprecomp
 
 import (
 	"github.com/hajimehoshi/ebiten/v2/internal/builtinshader"
-	"github.com/hajimehoshi/ebiten/v2/internal/graphics"
-	"github.com/hajimehoshi/ebiten/v2/internal/shaderir"
 )
 
 // AppendBuildinShaderSources appends all the built-in shader sources to the given slice.
@@ -27,44 +25,19 @@ import (
 // AppendBuildinShaderSources is concurrent-safe.
 func AppendBuildinShaderSources(sources []*ShaderSource) []*ShaderSource {
 	for _, s := range builtinshader.AppendShaderSources(nil) {
-		src, err := NewShaderSource(s)
-		if err != nil {
-			panic(err)
-		}
-		sources = append(sources, src)
+		sources = append(sources, NewShaderSource(s))
 	}
 	return sources
 }
 
 // ShaderSource is an object encapsulating a shader source code.
 type ShaderSource struct {
 	source []byte
-	id     ShaderSourceID
 }
 
 // NewShaderSource creates a new ShaderSource object from the given source code.
-func NewShaderSource(source []byte) (*ShaderSource, error) {
-	hash, err := graphics.CalcSourceHash(source)
-	if err != nil {
-		return nil, err
-	}
+func NewShaderSource(source []byte) *ShaderSource {
 	return &ShaderSource{
 		source: source,
-		id:     ShaderSourceID(hash),
-	}, nil
-}
-
-// ID returns a unique identifier for the shader source.
-// The ShaderSourceID value must be the same for the same shader source and the same Ebitengine version.
-// There is no guarantee that the ShaderSourceID value is the same between different Ebitengine versions.
-func (s *ShaderSource) ID() ShaderSourceID {
-	return s.id
-}
-
-// ShaderSourceID is a uniuqe identifier for a shader source.
-type ShaderSourceID [16]byte
-
-// String returns a string representation of the shader source ID.
-func (s ShaderSourceID) String() string {
-	return shaderir.SourceHash(s).String()
+	}
 }

shaderprecomp/shaderprecomp_darwin.go

@@ -21,7 +21,6 @@ import (
 
 	"github.com/hajimehoshi/ebiten/v2/internal/graphics"
 	"github.com/hajimehoshi/ebiten/v2/internal/graphicsdriver/metal"
-	"github.com/hajimehoshi/ebiten/v2/internal/shaderir"
 	"github.com/hajimehoshi/ebiten/v2/internal/shaderir/msl"
 )
 
@@ -45,5 +44,5 @@ func CompileToMSL(w io.Writer, source *ShaderSource) error {
 //
 // RegisterMetalLibrary is concurrent-safe.
 func RegisterMetalLibrary(source *ShaderSource, library []byte) {
-	metal.RegisterPrecompiledLibrary(shaderir.SourceHash(source.ID()), library)
+	metal.RegisterPrecompiledLibrary(source.source, library)
 }

shaderprecomp/shaderprecomp_playstation5.go

@@ -21,7 +21,6 @@ import (
 
 	"github.com/hajimehoshi/ebiten/v2/internal/graphics"
 	"github.com/hajimehoshi/ebiten/v2/internal/graphicsdriver/playstation5"
-	"github.com/hajimehoshi/ebiten/v2/internal/shaderir"
 	"github.com/hajimehoshi/ebiten/v2/internal/shaderir/pssl"
 )
 
@@ -47,5 +46,5 @@ func CompileToPSSL(vertexWriter, pixelWriter io.Writer, source *ShaderSource) er
 //
 // RegisterPlayStationShaders is concurrent-safe.
 func RegisterPlayStationShaders(source *ShaderSource, vertexShader, pixelShader []byte) {
-	playstation5.RegisterPrecompiledShaders(shaderir.SourceHash(source.ID()), vertexShader, pixelShader)
+	playstation5.RegisterPrecompiledShaders(source.source, vertexShader, pixelShader)
 }

shaderprecomp/shaderprecomp_windows.go

@@ -21,7 +21,6 @@ import (
 
 	"github.com/hajimehoshi/ebiten/v2/internal/graphics"
 	"github.com/hajimehoshi/ebiten/v2/internal/graphicsdriver/directx"
-	"github.com/hajimehoshi/ebiten/v2/internal/shaderir"
 	"github.com/hajimehoshi/ebiten/v2/internal/shaderir/hlsl"
 )
 
@@ -63,5 +62,5 @@ func CompileToHLSL(vertexWriter, pixelWriter io.Writer, source *ShaderSource) er
 //
 // RegisterFXCs is concurrent-safe.
 func RegisterFXCs(source *ShaderSource, vertexFXC, pixelFXC []byte) {
-	directx.RegisterPrecompiledFXCs(shaderir.SourceHash(source.ID()), vertexFXC, pixelFXC)
+	directx.RegisterPrecompiledFXCs(source.source, vertexFXC, pixelFXC)
 }