mirror of
https://github.com/sal063/AC6_recomp
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salh
73 lines
2.3 KiB
C++
73 lines
2.3 KiB
C++
#pragma once
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// Native UI runtime - surface abstraction
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// Part of the AC6 Recompilation native presenter/window layer
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#include <cstdint>
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#include <rex/assert.h>
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namespace rex {
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namespace ui {
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// Represents a surface that presenting can be performed to.
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// Surface methods can be called only from the UI thread.
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class Surface {
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public:
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enum TypeIndex {
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// Within one platform, the more preferable surface types are earlier in
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// this enumeration, so rex::bit_scan_forward can be used to try creating
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// surfaces of all types supported by both the graphics provider and the
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// window.
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// Android.
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kTypeIndex_AndroidNativeWindow,
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// GNU/Linux.
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kTypeIndex_XcbWindow,
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// Windows.
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kTypeIndex_Win32Hwnd,
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};
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using TypeFlags = uint32_t;
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enum : TypeFlags {
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kTypeFlag_AndroidNativeWindow = TypeFlags(1) << kTypeIndex_AndroidNativeWindow,
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kTypeFlag_XcbWindow = TypeFlags(1) << kTypeIndex_XcbWindow,
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kTypeFlag_Win32Hwnd = TypeFlags(1) << kTypeIndex_Win32Hwnd,
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};
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Surface(const Surface& surface) = delete;
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Surface& operator=(const Surface& surface) = delete;
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virtual ~Surface() = default;
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virtual TypeIndex GetType() const = 0;
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// Returns the up-to-date size (and true), or zeros (and false) if not ready
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// to open a presentation connection yet. The size preferably should be
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// exactly the dimensions of the surface in physical pixels of the display
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// (without stretching performed by the platform's composition), but even if
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// stretching happens, it is required that surface pixels have 1:1 aspect
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// ratio relatively to the physical display.
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bool GetSize(uint32_t& width_out, uint32_t& height_out) {
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// If any dimension is 0 (like, resized completely to zero in one direction,
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// but not in another), the surface is zero-area - don't try to present to
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// it.
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uint32_t width, height;
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if (!GetSizeImpl(width, height) || !width || !height) {
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width_out = 0;
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height_out = 0;
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return false;
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}
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width_out = width;
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height_out = height;
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return true;
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}
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protected:
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Surface() = default;
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// Returns the up-to-date size in physical pixels (and true), or zeros (and
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// optionally false) if not ready to open a presentation connection yet.
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virtual bool GetSizeImpl(uint32_t& width_out, uint32_t& height_out) const = 0;
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};
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} // namespace ui
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} // namespace rex
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