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package shader
Symbol_Kind :: enum {
Variable,
Parameter,
Function,
Struct_Type,
Builtin_Function,
Binding,
Constant,
Shared,
}
Symbol :: struct {
name: string,
type: ^Resolved_Type,
kind: Symbol_Kind,
span: Source_Span,
mutable: bool,
}
Scope :: struct {
parent: ^Scope,
symbols: map[string]^Symbol,
}
scope_new :: proc(parent: ^Scope = nil, allocator := context.allocator) -> ^Scope {
s := new(Scope, allocator)
s.parent = parent
s.symbols = make(map[string]^Symbol, allocator = allocator)
return s
}
scope_define :: proc(s: ^Scope, sym: ^Symbol) -> bool {
if sym.name in s.symbols {
return false // already defined in this scope
}
s.symbols[sym.name] = sym
return true
}
scope_lookup :: proc(s: ^Scope, name: string) -> ^Symbol {
current := s
for current != nil {
if sym, ok := current.symbols[name]; ok {
return sym
}
current = current.parent
}
return nil
}
scope_lookup_local :: proc(s: ^Scope, name: string) -> ^Symbol {
if sym, ok := s.symbols[name]; ok {
return sym
}
return nil
}
// Builtin function overload
Builtin_Overload :: struct {
param_types: []^Resolved_Type,
return_type: ^Resolved_Type,
}
Builtin_Def :: struct {
name: string,
overloads: []Builtin_Overload,
}
// Create the global scope with all builtins pre-populated
create_global_scope :: proc(allocator := context.allocator) -> ^Scope {
s := scope_new(nil, allocator)
// Register builtin type names as symbols
register_type_symbol(s, "bool", TYPE_BOOL, allocator)
register_type_symbol(s, "int", TYPE_INT, allocator)
register_type_symbol(s, "uint", TYPE_UINT, allocator)
register_type_symbol(s, "float", TYPE_FLOAT, allocator)
register_type_symbol(s, "half", TYPE_HALF, allocator)
register_type_symbol(s, "vec2", TYPE_VEC2, allocator)
register_type_symbol(s, "vec3", TYPE_VEC3, allocator)
register_type_symbol(s, "vec4", TYPE_VEC4, allocator)
register_type_symbol(s, "ivec2", TYPE_IVEC2, allocator)
register_type_symbol(s, "ivec3", TYPE_IVEC3, allocator)
register_type_symbol(s, "ivec4", TYPE_IVEC4, allocator)
register_type_symbol(s, "uvec2", TYPE_UVEC2, allocator)
register_type_symbol(s, "uvec3", TYPE_UVEC3, allocator)
register_type_symbol(s, "uvec4", TYPE_UVEC4, allocator)
register_type_symbol(s, "bvec2", TYPE_BVEC2, allocator)
register_type_symbol(s, "bvec3", TYPE_BVEC3, allocator)
register_type_symbol(s, "bvec4", TYPE_BVEC4, allocator)
register_type_symbol(s, "mat2", TYPE_MAT2, allocator)
register_type_symbol(s, "mat3", TYPE_MAT3, allocator)
register_type_symbol(s, "mat4", TYPE_MAT4, allocator)
register_type_symbol(s, "sampler2D", TYPE_SAMPLER2D, allocator)
register_type_symbol(s, "sampler2DShadow", TYPE_SAMPLER2D_SHADOW, allocator)
// Register matrix variant names
register_type_symbol(s, "mat2x2", TYPE_MAT2, allocator)
register_type_symbol(s, "mat3x3", TYPE_MAT3, allocator)
register_type_symbol(s, "mat4x4", TYPE_MAT4, allocator)
// Additional matrix sizes
mat2x3 := make_type(Type_Matrix{.Float, 2, 3}, allocator)
mat2x4 := make_type(Type_Matrix{.Float, 2, 4}, allocator)
mat3x2 := make_type(Type_Matrix{.Float, 3, 2}, allocator)
mat3x4 := make_type(Type_Matrix{.Float, 3, 4}, allocator)
mat4x2 := make_type(Type_Matrix{.Float, 4, 2}, allocator)
mat4x3 := make_type(Type_Matrix{.Float, 4, 3}, allocator)
register_type_symbol(s, "mat2x3", mat2x3, allocator)
register_type_symbol(s, "mat2x4", mat2x4, allocator)
register_type_symbol(s, "mat3x2", mat3x2, allocator)
register_type_symbol(s, "mat3x4", mat3x4, allocator)
register_type_symbol(s, "mat4x2", mat4x2, allocator)
register_type_symbol(s, "mat4x3", mat4x3, allocator)
// Register builtin functions
// Math builtins (float -> float)
math_1f := []string{
"abs", "sign", "floor", "ceil", "round", "fract", "sqrt", "inversesqrt",
"exp", "exp2", "log", "log2", "sin", "cos", "tan", "asin", "acos", "atan",
}
for name in math_1f {
register_builtin_fn(s, name, TYPE_FLOAT, allocator)
}
// Math builtins (float, float -> float)
math_2f := []string{"mod", "min", "max", "pow", "atan2", "step"}
for name in math_2f {
register_builtin_fn_2(s, name, TYPE_FLOAT, TYPE_FLOAT, TYPE_FLOAT, allocator)
}
// clamp, mix, smoothstep (3 args)
register_builtin_fn_3(s, "clamp", TYPE_FLOAT, TYPE_FLOAT, TYPE_FLOAT, TYPE_FLOAT, allocator)
register_builtin_fn_3(s, "mix", TYPE_FLOAT, TYPE_FLOAT, TYPE_FLOAT, TYPE_FLOAT, allocator)
register_builtin_fn_3(s, "smoothstep", TYPE_FLOAT, TYPE_FLOAT, TYPE_FLOAT, TYPE_FLOAT, allocator)
// Vector builtins
register_builtin_fn(s, "normalize", TYPE_VEC3, allocator) // simplified - works on any vec
register_builtin_fn(s, "length", TYPE_FLOAT, allocator)
register_builtin_fn_2(s, "dot", TYPE_VEC3, TYPE_VEC3, TYPE_FLOAT, allocator)
register_builtin_fn_2(s, "cross", TYPE_VEC3, TYPE_VEC3, TYPE_VEC3, allocator)
register_builtin_fn_2(s, "distance", TYPE_VEC3, TYPE_VEC3, TYPE_FLOAT, allocator)
register_builtin_fn_2(s, "reflect", TYPE_VEC3, TYPE_VEC3, TYPE_VEC3, allocator)
register_builtin_fn_3(s, "refract", TYPE_VEC3, TYPE_VEC3, TYPE_FLOAT, TYPE_VEC3, allocator)
register_builtin_fn_3(s, "faceforward", TYPE_VEC3, TYPE_VEC3, TYPE_VEC3, TYPE_VEC3, allocator)
// Matrix builtins
register_builtin_fn(s, "transpose", TYPE_MAT4, allocator)
register_builtin_fn(s, "inverse", TYPE_MAT4, allocator)
register_builtin_fn(s, "determinant", TYPE_FLOAT, allocator)
// Texture builtins
register_builtin_fn_2(s, "sample", TYPE_SAMPLER2D, TYPE_VEC2, TYPE_VEC4, allocator)
register_builtin_fn_3(s, "sample_level", TYPE_SAMPLER2D, TYPE_VEC2, TYPE_FLOAT, TYPE_VEC4, allocator)
register_builtin_fn_3(s, "sample_shadow", TYPE_SAMPLER2D_SHADOW, TYPE_VEC2, TYPE_FLOAT, TYPE_FLOAT, allocator)
// Derivative builtins (fragment only)
register_builtin_fn(s, "dfdx", TYPE_FLOAT, allocator)
register_builtin_fn(s, "dfdy", TYPE_FLOAT, allocator)
register_builtin_fn(s, "fwidth", TYPE_FLOAT, allocator)
// Compute builtins
register_builtin_fn(s, "barrier", TYPE_VOID, allocator)
// Conditional select
register_builtin_fn(s, "select", TYPE_VOID, allocator) // return type resolved specially in sema
return s
}
@(private = "file")
register_type_symbol :: proc(s: ^Scope, name: string, t: ^Resolved_Type, allocator := context.allocator) {
sym := new(Symbol, allocator)
sym^ = Symbol{
name = name,
type = t,
kind = .Struct_Type, // Using Struct_Type for all type symbols
}
scope_define(s, sym)
}
@(private = "file")
register_builtin_fn :: proc(s: ^Scope, name: string, ret_type: ^Resolved_Type, allocator := context.allocator) {
sym := new(Symbol, allocator)
sym^ = Symbol{
name = name,
type = ret_type,
kind = .Builtin_Function,
}
scope_define(s, sym)
}
@(private = "file")
register_builtin_fn_2 :: proc(s: ^Scope, name: string, p1, p2, ret: ^Resolved_Type, allocator := context.allocator) {
sym := new(Symbol, allocator)
sym^ = Symbol{
name = name,
type = ret,
kind = .Builtin_Function,
}
scope_define(s, sym)
}
@(private = "file")
register_builtin_fn_3 :: proc(s: ^Scope, name: string, p1, p2, p3, ret: ^Resolved_Type, allocator := context.allocator) {
sym := new(Symbol, allocator)
sym^ = Symbol{
name = name,
type = ret,
kind = .Builtin_Function,
}
scope_define(s, sym)
}