mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-12-25 11:18:54 +01:00
110 lines
3.1 KiB
Go
110 lines
3.1 KiB
Go
// +build windows
|
|
|
|
// Code generated by glow (https://github.com/go-gl/glow). DO NOT EDIT.
|
|
|
|
package gl
|
|
|
|
import (
|
|
"fmt"
|
|
"reflect"
|
|
"runtime"
|
|
"strings"
|
|
"unsafe"
|
|
)
|
|
|
|
// Ptr takes a slice or pointer (to a singular scalar value or the first
|
|
// element of an array or slice) and returns its GL-compatible address.
|
|
//
|
|
// For example:
|
|
//
|
|
// var data []uint8
|
|
// ...
|
|
// gl.TexImage2D(gl.TEXTURE_2D, ..., gl.UNSIGNED_BYTE, gl.Ptr(&data[0]))
|
|
func Ptr(data interface{}) unsafe.Pointer {
|
|
if data == nil {
|
|
return unsafe.Pointer(nil)
|
|
}
|
|
var addr unsafe.Pointer
|
|
v := reflect.ValueOf(data)
|
|
switch v.Type().Kind() {
|
|
case reflect.Ptr:
|
|
e := v.Elem()
|
|
switch e.Kind() {
|
|
case
|
|
reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64,
|
|
reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64,
|
|
reflect.Float32, reflect.Float64:
|
|
addr = unsafe.Pointer(e.UnsafeAddr())
|
|
default:
|
|
panic(fmt.Errorf("unsupported pointer to type %s; must be a slice or pointer to a singular scalar value or the first element of an array or slice", e.Kind()))
|
|
}
|
|
case reflect.Uintptr:
|
|
addr = unsafe.Pointer(v.Pointer())
|
|
case reflect.Slice:
|
|
addr = unsafe.Pointer(v.Index(0).UnsafeAddr())
|
|
default:
|
|
panic(fmt.Errorf("unsupported type %s; must be a slice or pointer to a singular scalar value or the first element of an array or slice", v.Type()))
|
|
}
|
|
return addr
|
|
}
|
|
|
|
// PtrOffset takes a pointer offset and returns a GL-compatible pointer.
|
|
// Useful for functions such as glVertexAttribPointer that take pointer
|
|
// parameters indicating an offset rather than an absolute memory address.
|
|
func PtrOffset(offset int) unsafe.Pointer {
|
|
return unsafe.Pointer(uintptr(offset))
|
|
}
|
|
|
|
// Str takes a null-terminated Go string and returns its GL-compatible address.
|
|
// This function reaches into Go string storage in an unsafe way so the caller
|
|
// must ensure the string is not garbage collected.
|
|
func Str(str string) *uint8 {
|
|
if !strings.HasSuffix(str, "\x00") {
|
|
panic("str argument missing null terminator: " + str)
|
|
}
|
|
header := (*reflect.StringHeader)(unsafe.Pointer(&str))
|
|
return (*uint8)(unsafe.Pointer(header.Data))
|
|
}
|
|
|
|
// GoStr takes a null-terminated string returned by OpenGL and constructs a
|
|
// corresponding Go string.
|
|
func GoStr(cstr *uint8) string {
|
|
str := ""
|
|
for {
|
|
if *cstr == 0 {
|
|
break
|
|
}
|
|
str += string(*cstr)
|
|
cstr = (*uint8)(unsafe.Pointer(uintptr(unsafe.Pointer(cstr)) + 1))
|
|
}
|
|
return str
|
|
}
|
|
|
|
// Strs takes a list of Go strings (with or without null-termination) and
|
|
// returns their C counterpart.
|
|
//
|
|
// The returned free function must be called once you are done using the strings
|
|
// in order to free the memory.
|
|
//
|
|
// If no strings are provided as a parameter this function will panic.
|
|
func Strs(strs ...string) (cstrs **uint8, free func()) {
|
|
if len(strs) == 0 {
|
|
panic("Strs: expected at least 1 string")
|
|
}
|
|
|
|
var pinned []string
|
|
var ptrs []*uint8
|
|
for _, str := range strs {
|
|
if !strings.HasSuffix(str, "\x00") {
|
|
str += "\x00"
|
|
}
|
|
pinned = append(pinned, str)
|
|
ptrs = append(ptrs, Str(str))
|
|
}
|
|
|
|
return &ptrs[0], func() {
|
|
runtime.KeepAlive(pinned)
|
|
pinned = nil
|
|
}
|
|
}
|