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GPU/SW: Use new 5-to-8 converters for RGBA8 display

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This commit is contained in:
Connor McLaughlin
2021-03-18 12:55:02 +10:00
parent 6c05413220
commit b13c51a2e2
8 changed files with 34 additions and 68 deletions
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21
src/core/gpu.h
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@ -175,27 +175,6 @@ protected:
}
ALWAYS_INLINE static constexpr TickCount SystemTicksToGPUTicks(TickCount sysclk_ticks) { return sysclk_ticks << 1; }
// Helper/format conversion functions - constants from https://stackoverflow.com/a/9069480
ALWAYS_INLINE static constexpr u32 Convert5To8(u32 color) { return (((color * 527u) + 23u) >> 6); }
ALWAYS_INLINE static constexpr u32 Convert8To5(u32 color) { return (((color * 249u) + 1014u) >> 11); }
static constexpr u32 RGBA5551ToRGBA8888(u32 color)
{
const u32 r = Convert5To8(color & 31u);
const u32 g = Convert5To8((color >> 5) & 31u);
const u32 b = Convert5To8((color >> 10) & 31u);
const u32 a = ((color >> 15) != 0) ? 255 : 0;
return ZeroExtend32(r) | (ZeroExtend32(g) << 8) | (ZeroExtend32(b) << 16) | (ZeroExtend32(a) << 24);
}
static constexpr u16 RGBA8888ToRGBA5551(u32 color)
{
const u32 r = Convert8To5(color & 0xFFu);
const u32 g = Convert8To5((color >> 8) & 0xFFu);
const u32 b = Convert8To5((color >> 16) & 0xFFu);
const u32 a = ((color >> 24) & 0x01u);
return Truncate16(r | (g << 5) | (b << 10) | (a << 15));
}
static constexpr std::tuple<u8, u8> UnpackTexcoord(u16 texcoord)
{
return std::make_tuple(static_cast<u8>(texcoord), static_cast<u8>(texcoord >> 8));