pub fn generate_shader(
draw_shader_def: &DrawShaderDef,
const_table: &DrawShaderConstTable,
shader_registry: &ShaderRegistry,
) -> MetalGeneratedShaderpub fn generate_shader(
draw_shader_def: &DrawShaderDef,
const_table: &DrawShaderConstTable,
shader_registry: &ShaderRegistry,
) -> MetalGeneratedShader