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/driver/driver.go

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