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https://github.com/hajimehoshi/ebiten.git
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43 lines
973 B
Go
43 lines
973 B
Go
// SPDX-License-Identifier: MIT
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package gl
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import (
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"fmt"
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"unsafe"
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)
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// Ptr takes a slice or pointer (to a singular scalar value or the first
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// element of an array or slice) and returns its GL-compatible address.
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//
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// For example:
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//
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// var data []byte
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// ...
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// gl.TexImage2D(glconst.TEXTURE_2D, ..., glconst.UNSIGNED_BYTE, gl.Ptr(&data[0]))
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func Ptr(data any) unsafe.Pointer {
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if data == nil {
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return unsafe.Pointer(nil)
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}
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var addr unsafe.Pointer
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switch v := data.(type) {
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case *uint8:
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addr = unsafe.Pointer(v)
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case *uint16:
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addr = unsafe.Pointer(v)
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case *float32:
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addr = unsafe.Pointer(v)
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case []uint8:
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addr = unsafe.Pointer(&v[0])
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case []uint16:
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addr = unsafe.Pointer(&v[0])
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case []uint32:
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addr = unsafe.Pointer(&v[0])
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case []float32:
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addr = unsafe.Pointer(&v[0])
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default:
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panic(fmt.Errorf("unsupported type %T; must be a slice or pointer to a singular scalar value or the first element of an array or slice", v))
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}
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return addr
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}
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