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spirvcross.go
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spirvcross.go
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// SPDX-License-Identifier: Unlicense OR MIT
package main
import (
"encoding/json"
"fmt"
"os/exec"
"path/filepath"
"sort"
"strings"
"github.com/cybriq/p9/pkg/gel/gio/gpu/internal/driver"
)
// Metadata contains reflection data about a shader.
type Metadata struct {
Uniforms driver.UniformsReflection
Inputs []driver.InputLocation
Textures []driver.TextureBinding
}
// SPIRVCross cross-compiles spirv shaders to es, hlsl and others.
type SPIRVCross struct {
Bin string
WorkDir WorkDir
}
func NewSPIRVCross() *SPIRVCross { return &SPIRVCross{Bin: "spirv-cross"} }
// Convert converts compute shader from spirv format to a target format.
func (spirv *SPIRVCross) Convert(
path, variant string, shader []byte,
target, version string,
) (string, error) {
base := spirv.WorkDir.Path(filepath.Base(path), variant)
if err := spirv.WorkDir.WriteFile(base, shader); err != nil {
return "", fmt.Errorf("unable to write shader to disk: %w", err)
}
var cmd *exec.Cmd
switch target {
case "glsl":
cmd = exec.Command(
spirv.Bin,
"--no-es",
"--version", version,
)
case "es":
cmd = exec.Command(
spirv.Bin,
"--es",
"--version", version,
)
case "hlsl":
cmd = exec.Command(
spirv.Bin,
"--hlsl",
"--shader-model", version,
)
default:
return "", fmt.Errorf("unknown target %q", target)
}
cmd.Args = append(cmd.Args, "--no-420pack-extension", base)
out, err := cmd.CombinedOutput()
if err != nil {
return "", fmt.Errorf("%s\nfailed to run %v: %w", out, cmd.Args, err)
}
s := string(out)
if target != "hlsl" {
// Strip Windows \r in line endings.
s = unixLineEnding(s)
}
return s, nil
}
// Metadata extracts metadata for a SPIR-V shader.
func (spirv *SPIRVCross) Metadata(
path, variant string, shader []byte,
) (Metadata, error) {
base := spirv.WorkDir.Path(filepath.Base(path), variant)
if err := spirv.WorkDir.WriteFile(base, shader); err != nil {
return Metadata{}, fmt.Errorf("unable to write shader to disk: %w", err)
}
cmd := exec.Command(
spirv.Bin,
base,
"--reflect",
)
out, err := cmd.Output()
if err != nil {
return Metadata{}, fmt.Errorf("failed to run %v: %w", cmd.Args, err)
}
meta, err := parseMetadata(out)
if err != nil {
return Metadata{}, fmt.Errorf(
"%s\nfailed to parse metadata: %w", out,
err,
)
}
return meta, nil
}
func parseMetadata(data []byte) (Metadata, error) {
var reflect struct {
Types map[string]struct {
Name string `json:"name"`
Members []struct {
Name string `json:"name"`
Type string `json:"type"`
Offset int `json:"offset"`
} `json:"members"`
} `json:"types"`
Inputs []struct {
Name string `json:"name"`
Type string `json:"type"`
Location int `json:"location"`
} `json:"inputs"`
Textures []struct {
Name string `json:"name"`
Type string `json:"type"`
Set int `json:"set"`
Binding int `json:"binding"`
} `json:"textures"`
UBOs []struct {
Name string `json:"name"`
Type string `json:"type"`
BlockSize int `json:"block_size"`
Set int `json:"set"`
Binding int `json:"binding"`
} `json:"ubos"`
}
if err := json.Unmarshal(data, &reflect); err != nil {
return Metadata{}, fmt.Errorf(
"failed to parse reflection data: %w",
err,
)
}
var m Metadata
for _, input := range reflect.Inputs {
dataType, dataSize, err := parseDataType(input.Type)
if err != nil {
return Metadata{}, fmt.Errorf("parseReflection: %v", err)
}
m.Inputs = append(
m.Inputs, driver.InputLocation{
Name: input.Name,
Location: input.Location,
Semantic: "TEXCOORD",
SemanticIndex: input.Location,
Type: dataType,
Size: dataSize,
},
)
}
sort.Slice(
m.Inputs, func(i, j int) bool {
return m.Inputs[i].Location < m.Inputs[j].Location
},
)
blockOffset := 0
for _, block := range reflect.UBOs {
m.Uniforms.Blocks = append(
m.Uniforms.Blocks, driver.UniformBlock{
Name: block.Name,
Binding: block.Binding,
},
)
t := reflect.Types[block.Type]
// By convention uniform block variables are named by prepending an underscore
// and converting to lowercase.
blockVar := "_" + strings.ToLower(block.Name)
for _, member := range t.Members {
dataType, size, err := parseDataType(member.Type)
if err != nil {
return Metadata{}, fmt.Errorf(
"failed to parse reflection data: %v",
err,
)
}
m.Uniforms.Locations = append(
m.Uniforms.Locations,
driver.UniformLocation{
Name: fmt.Sprintf("%s.%s", blockVar, member.Name),
Type: dataType,
Size: size,
Offset: blockOffset + member.Offset,
},
)
}
blockOffset += block.BlockSize
}
m.Uniforms.Size = blockOffset
for _, texture := range reflect.Textures {
m.Textures = append(
m.Textures, driver.TextureBinding{
Name: texture.Name,
Binding: texture.Binding,
},
)
}
// return m, fmt.Errorf("not yet!: %+v", reflect)
return m, nil
}
func parseDataType(t string) (driver.DataType, int, error) {
switch t {
case "float":
return driver.DataTypeFloat, 1, nil
case "vec2":
return driver.DataTypeFloat, 2, nil
case "vec3":
return driver.DataTypeFloat, 3, nil
case "vec4":
return driver.DataTypeFloat, 4, nil
case "int":
return driver.DataTypeInt, 1, nil
case "int2":
return driver.DataTypeInt, 2, nil
case "int3":
return driver.DataTypeInt, 3, nil
case "int4":
return driver.DataTypeInt, 4, nil
default:
return 0, 0, fmt.Errorf("unsupported input data type: %s", t)
}
}