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type.go
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type.go
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package main
import (
"fmt"
"strings"
)
// A Type describes the C and Go type of a function parameter or return value.
type Type struct {
Name string // Name of the type without modifiers
PointerLevel int // Number of levels of declared indirection to the type
CDefinition string // Raw C definition
Cast string // Raw C cast in case conversion is necessary
}
// A Typedef describes a C typedef statement.
type Typedef struct {
Name string // Name of the defined type (or included types)
CDefinition string // Raw C definition
}
func (t Type) String() string {
return fmt.Sprintf("%s%s [%s]", t.Name, t.pointers(), t.CDefinition)
}
// IsVoid indicates whether this type is the void pseudo-type.
func (t Type) IsVoid() bool {
return (t.Name == "void" || t.Name == "GLvoid") && t.PointerLevel == 0
}
// IsDebugProc indicates whether this type is a debug callback function pointer.
func (t Type) IsDebugProc() bool {
return t.Name == "GLDEBUGPROC" || t.Name == "GLDEBUGPROCARB" || t.Name == "GLDEBUGPROCKHR"
}
// CType returns the C definition of the type.
func (t Type) CType() string {
return t.CDefinition
}
// GoCType returns the Go definition of the C type.
func (t Type) GoCType() string {
if strings.HasPrefix(t.Name, "struct ") {
return t.pointers() + "C.struct_" + strings.TrimPrefix(t.Name, "struct ")
}
return t.pointers() + "C." + t.Name
}
// GoType returns the Go definition of the type.
func (t Type) GoType() string {
switch t.Name {
case "GLbyte":
return t.pointers() + "int8"
case "GLubyte":
return t.pointers() + "uint8"
case "GLshort":
return t.pointers() + "int16"
case "GLushort":
return t.pointers() + "uint16"
case "GLint":
return t.pointers() + "int32"
case "GLuint":
return t.pointers() + "uint32"
case "GLint64", "GLint64EXT":
return t.pointers() + "int64"
case "GLuint64", "GLuint64EXT":
return t.pointers() + "uint64"
case "GLfloat", "GLclampf":
return t.pointers() + "float32"
case "GLdouble", "GLclampd":
return t.pointers() + "float64"
case "GLclampx":
return t.pointers() + "int32"
case "GLsizei":
return t.pointers() + "int32"
case "GLfixed":
return t.pointers() + "int32"
case "GLchar", "GLcharARB":
// Chosen (vs. byte) for compatibility where GL uses GLubyte for strings (e.g., glGetString)
return t.pointers() + "uint8"
case "GLboolean":
return t.pointers() + "bool"
case "GLenum", "GLbitfield":
return t.pointers() + "uint32"
case "GLhalf", "GLhalfNV":
// Go has no 16-bit floating point type
return t.pointers() + "uint16"
case "void", "GLvoid":
// Type void* could map to either uintptr or unsafe.Pointer but we use the
// latter because pointers passed from Go to C need to use Go pointer types
// for the sake of the GC
if t.PointerLevel == 1 {
return "unsafe.Pointer"
} else if t.PointerLevel == 2 {
return "*unsafe.Pointer"
}
case "GLintptr", "GLintptrARB":
// Type ptrdiff_t should map to an architecture-width Go int
return t.pointers() + "int"
case "GLsizeiptr", "GLsizeiptrARB":
// Same as GLintptr
return t.pointers() + "int"
case "GLhandleARB", "GLeglImagesOES", "GLvdpauSurfaceNV":
// OpenGL pointer types should fit in a pointer-width Go type. No need to
// use unsafe.Pointer because there is no need for the Go GC to understand
// that these are pointer types. Moreover on most platforms GLhandleARB is
// an integer type.
return t.pointers() + "uintptr"
case "GLsync":
// GLsync is treated as an opaque, pointer-width type. Additional special
// case handling is required for the corresponding typedef, see CTypedef.
return t.pointers() + "uintptr"
case "GLDEBUGPROC", "GLDEBUGPROCARB", "GLDEBUGPROCKHR":
// Special case mapping to the type defined in debug.tmpl
return "DebugProc"
case "uintptr_t":
return t.pointers() + "uintptr"
}
return "unsafe.Pointer"
}
// ConvertGoToC returns an expression that converts a variable from the Go type to the C type.
func (t Type) ConvertGoToC(name string) string {
switch t.Name {
case "GLboolean":
if t.PointerLevel == 0 {
return fmt.Sprintf("(C.GLboolean)(boolToInt(%s))", name)
}
case "void", "GLvoid":
return name
case "GLDEBUGPROC", "GLDEBUGPROCARB", "GLDEBUGPROCKHR":
return fmt.Sprintf("(C.%s)(unsafe.Pointer(&%s))", t.Name, name)
}
if t.PointerLevel >= 1 && t.GoType() != "unsafe.Pointer" {
return fmt.Sprintf("(%s)(unsafe.Pointer(%s))", t.GoCType(), name)
}
return fmt.Sprintf("(%s)(%s)", t.GoCType(), name)
}
// ConvertCToGo converts from the C type to the Go type.
func (t Type) ConvertCToGo(name string) string {
if t.Name == "GLboolean" {
return fmt.Sprintf("%s == TRUE", name)
}
return fmt.Sprintf("(%s)(%s)", t.GoType(), name)
}
func (t Type) pointers() string {
return strings.Repeat("*", t.PointerLevel)
}
// CTypedef returns the C definition of the typedef.
func (t Typedef) CTypedef() string {
// GLsync is defined as an opaque struct pointer, but some OpenGL drivers
// store a non-pointer numeric handle in the type, which is incompatible with
// Go pointer semantics. As a workaround we redefined GLsync to be an opaque
// pointer-width type.
if strings.Contains(t.CDefinition, "GLsync") {
return "typedef uintptr_t GLsync;"
}
return t.CDefinition
}