1 files changed, 157 insertions, 0 deletions
diff --git a/rendy-memory/src/util.rs b/rendy-memory/src/util.rs
new file mode 100644
index 0000000..07b9b7c
--- /dev/null
+++ b/rendy-memory/src/util.rs
@@ -0,0 +1,157 @@
+pub(crate) fn aligned(value: u64, align: u64) -> u64 {
+    debug_assert_ne!(align, 0);
+    debug_assert_eq!(align.count_ones(), 1);
+    if value == 0 {
+        0
+    } else {
+        1u64 + ((value - 1u64) | (align - 1u64))
+    }
+}
+
+pub(crate) trait IntegerFitting {
+    fn fits_usize(self) -> bool;
+    fn fits_isize(self) -> bool;
+
+    fn usize_fits(value: usize) -> bool;
+    fn isize_fits(value: isize) -> bool;
+}
+
+#[cfg(any(target_pointer_width = "16", target_pointer_width = "32"))]
+impl IntegerFitting for u64 {
+    fn fits_usize(self) -> bool {
+        self <= usize::max_value() as u64
+    }
+    fn fits_isize(self) -> bool {
+        self <= isize::max_value() as u64
+    }
+    fn usize_fits(_value: usize) -> bool {
+        true
+    }
+    fn isize_fits(value: isize) -> bool {
+        value >= 0
+    }
+}
+
+#[cfg(target_pointer_width = "64")]
+impl IntegerFitting for u64 {
+    fn fits_usize(self) -> bool {
+        true
+    }
+    fn fits_isize(self) -> bool {
+        self <= isize::max_value() as u64
+    }
+    fn usize_fits(_value: usize) -> bool {
+        true
+    }
+    fn isize_fits(value: isize) -> bool {
+        value >= 0
+    }
+}
+
+#[cfg(not(any(
+    target_pointer_width = "16",
+    target_pointer_width = "32",
+    target_pointer_width = "64"
+)))]
+impl IntegerFitting for u64 {
+    fn fits_usize(self) -> bool {
+        true
+    }
+    fn fits_isize(self) -> bool {
+        true
+    }
+    fn usize_fits(value: usize) -> bool {
+        value <= u64::max_value() as usize
+    }
+    fn isize_fits(value: isize) -> bool {
+        value >= 0 && value <= u64::max_value() as isize
+    }
+}
+
+#[cfg(target_pointer_width = "16")]
+impl IntegerFitting for u32 {
+    fn fits_usize(self) -> bool {
+        self <= usize::max_value() as u32
+    }
+    fn fits_isize(self) -> bool {
+        self <= isize::max_value() as u32
+    }
+    fn usize_fits(_value: usize) -> bool {
+        true
+    }
+    fn isize_fits(value: isize) -> bool {
+        value >= 0
+    }
+}
+
+#[cfg(target_pointer_width = "32")]
+impl IntegerFitting for u32 {
+    fn fits_usize(self) -> bool {
+        true
+    }
+    fn fits_isize(self) -> bool {
+        self <= isize::max_value() as u32
+    }
+    fn usize_fits(_value: usize) -> bool {
+        true
+    }
+    fn isize_fits(value: isize) -> bool {
+        value >= 0
+    }
+}
+
+#[cfg(not(any(target_pointer_width = "16", target_pointer_width = "32")))]
+impl IntegerFitting for u32 {
+    fn fits_usize(self) -> bool {
+        true
+    }
+    fn fits_isize(self) -> bool {
+        true
+    }
+    fn usize_fits(value: usize) -> bool {
+        value <= u32::max_value() as usize
+    }
+    fn isize_fits(value: isize) -> bool {
+        value >= 0 && value <= u32::max_value() as isize
+    }
+}
+
+pub(crate) fn fits_usize<T: IntegerFitting>(value: T) -> bool {
+    value.fits_usize()
+}
+
+pub(crate) fn fits_u32(value: usize) -> bool {
+    u32::usize_fits(value)
+}
+
+pub(crate) fn align_range(range: std::ops::Range<u64>, align: u64) -> std::ops::Range<u64> {
+    let start = range.start - range.start % align;
+    let end = ((range.end - 1) / align + 1) * align;
+    start..end
+}
+
+pub(crate) fn align_size(size: u64, align: u64) -> u64 {
+    ((size - 1) / align + 1) * align
+}
+
+pub(crate) fn is_non_coherent_visible(properties: gfx_hal::memory::Properties) -> bool {
+    properties & (gfx_hal::memory::Properties::CPU_VISIBLE | gfx_hal::memory::Properties::COHERENT)
+        == gfx_hal::memory::Properties::CPU_VISIBLE
+}
+
+pub(crate) fn relative_to_sub_range(
+    range: std::ops::Range<u64>,
+    relative: std::ops::Range<u64>,
+) -> Option<std::ops::Range<u64>> {
+    let start = relative.start + range.start;
+    let end = relative.end + range.start;
+    if end <= range.end {
+        Some(start..end)
+    } else {
+        None
+    }
+}
+
+pub(crate) fn is_sub_range(range: std::ops::Range<u64>, sub: std::ops::Range<u64>) -> bool {
+    sub.start >= range.start && sub.end <= range.end
+}