gpu,gpu/internal: generate hashes of compute programs

The CPU fallback for the compute renderer is contained in a separate
module for space reasons, but the CPU binaries must exactly match the
compute programs. However, there is no way to express that constraint
in go.mod.

This change generates hashes of every compute program so that a
following change can verify the CPU binaries match the programs.

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

gpu/internal/convertshaders/main.go

@@ -4,6 +4,8 @@ package main
 
 import (
 	"bytes"
+	"crypto/sha256"
+	"encoding/hex"
 	"errors"
 	"flag"
 	"fmt"
@@ -232,6 +234,9 @@ func (conv *Converter) Run(out io.Writer) error {
 			if len(src.HLSL) > 0 {
 				fmt.Fprintf(out, "HLSL: %q,\n", src.HLSL)
 			}
+			if len(src.Hash) > 0 {
+				fmt.Fprintf(out, "Hash: %q,\n", src.Hash)
+			}
 			fmt.Fprintf(out, "}")
 			if multiVariant {
 				fmt.Fprintf(out, ",")
@@ -366,6 +371,9 @@ func (conv *Converter) ComputeShader(shaderPath string) ([]driver.ShaderSources,
 	var sources driver.ShaderSources
 	sources.Name = filepath.Base(shaderPath)
 
+	sum := sha256.Sum256(shader)
+	sources.Hash = hex.EncodeToString(sum[:])
+
 	sources.GLSL310ES, err = conv.spirv.Convert(shaderPath, "", spirv, "es", "310")
 	if err != nil {
 		return nil, fmt.Errorf("failed to convert es compute shader %q: %w", shaderPath, err)

gpu/internal/driver/driver.go

@@ -64,6 +64,7 @@ type ShaderSources struct {
 	Uniforms  UniformsReflection
 	Inputs    []InputLocation
 	Textures  []TextureBinding
+	Hash      string
 }
 
 type UniformsReflection struct {

gpu/shaders.go

@@ -250,6 +250,7 @@ void main()
 }
 
 `,
+		Hash: "6862eaf623d89da635e9d5bc981c77aae4e39aa44047ab47c62d243cf5fe7e73",
 	}
 	shader_binning_comp = driver.ShaderSources{
 		Name: "binning.comp",
@@ -573,6 +574,7 @@ void main()
 }
 
 `,
+		Hash: "84177b6dfb90309a6c054ab9fea42293bd49033c221651c756eb40188f4d6ce8",
 	}
 	shader_blit_frag = [...]driver.ShaderSources{
 		{
@@ -2172,6 +2174,7 @@ void main()
 }
 
 `,
+		Hash: "e7ef250c08701490aed979a889cca73943b988bdb5e4ca4b02735aebcf5e5505",
 	}
 	shader_copy_frag = driver.ShaderSources{
 		Name:     "copy.frag",
@@ -4204,6 +4207,7 @@ void main()
 }
 
 `,
+		Hash: "0f18de15866045b36217068789c9c8715a63e0f9f120c53ea2d4d76f53e443c3",
 	}
 	shader_intersect_frag = driver.ShaderSources{
 		Name:     "intersect.frag",
@@ -5066,6 +5070,7 @@ void main()
 }
 
 `,
+		Hash: "e72e482d7f40b2949426017cb5aeb4d391fcfc0e9d42e73bffb5a1e5576e906d",
 	}
 	shader_material_frag = driver.ShaderSources{
 		Name:     "material.frag",
@@ -5950,6 +5955,7 @@ void main()
 }
 
 `,
+		Hash: "ed67e14c880cf92bdd7a9d520610e8c8b139907ff8b55df20464d353a7f58e79",
 	}
 	shader_stencil_frag = driver.ShaderSources{
 		Name:   "stencil.frag",
@@ -6632,5 +6638,6 @@ void main()
 }
 
 `,
+		Hash: "364b3cf559d02a86c751292bedc571d5ceef2df899de39ad483b4176294e9857",
 	}
 )