mirror of https://github.com/nmlgc/ReC98.git
82 lines
1.8 KiB
C++
82 lines
1.8 KiB
C++
// Fixed-point format for expressing world-space coordinates, with 4 bits of
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// fractional resolution.
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#define PIXEL_NONE (-999)
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typedef int subpixel_t;
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#define TO_SP(v) \
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(v << 4)
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inline subpixel_t to_sp(float pixel_v) {
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return static_cast<subpixel_t>(pixel_v * 16.0f);
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}
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template <class SubpixelType, class PixelType> class SubpixelBase {
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public:
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typedef SubpixelBase<SubpixelType, PixelType> SelfType;
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// Code generation will require direct access to v, if performing
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// arithmetic with a local variable...
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SubpixelType v;
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SubpixelType operator +(float pixel_v) {
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return (this->v + static_cast<SubpixelType>(to_sp(pixel_v)));
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}
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SubpixelType operator -(const SelfType &other) {
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return (this->v - other.v);
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}
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void operator +=(float pixel_v) {
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this->v += static_cast<SubpixelType>(to_sp(pixel_v));
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}
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void operator -=(float pixel_v) {
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this->v -= static_cast<SubpixelType>(to_sp(pixel_v));
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}
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// No overloads of `operator =()`, since the class needs to be trivially
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// copyable.
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void set(float pixel_v) {
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v = static_cast<SubpixelType>(to_sp(pixel_v));
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}
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void set(const PixelType &pixel_v) {
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v = static_cast<SubpixelType>(TO_SP(pixel_v));
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}
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PixelType to_pixel() const {
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return static_cast<PixelType>(v >> 4);
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}
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PixelType to_pixel_slow() const { // MODDERS: Delete
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return (v / 16);
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}
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operator SubpixelType() const {
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return v;
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}
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static SubpixelType None() {
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return static_cast<SubpixelType>(TO_SP(PIXEL_NONE));
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}
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};
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template <class T> struct SPPointBase {
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T x, y;
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void set(float screen_x, float screen_y) {
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x.set(screen_x);
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y.set(screen_y);
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}
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};
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// 16-bit (Q12.4)
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typedef SubpixelBase<subpixel_t, pixel_t> Subpixel;
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typedef SPPointBase<Subpixel> SPPoint;
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// 8-bit (Q4.4)
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typedef SubpixelBase<unsigned char, unsigned char> SubpixelLength8;
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typedef SubpixelBase<char, char> Subpixel8;
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typedef SPPointBase<Subpixel8> SPPoint8;
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