ppsspp/GPU/Common/StencilCommon.cpp

#pragma once

#include "GPU/Common/StencilCommon.h"

u8 StencilBits5551(const u8 *ptr8, u32 numPixels) {
	const u32 *ptr = (const u32 *)ptr8;

	for (u32 i = 0; i < numPixels / 2; ++i) {
		if (ptr[i] & 0x80008000) {
			return 1;
		}
	}
	return 0;
}

u8 StencilBits4444(const u8 *ptr8, u32 numPixels) {
	const u32 *ptr = (const u32 *)ptr8;
	u32 bits = 0;

	for (u32 i = 0; i < numPixels / 2; ++i) {
		bits |= ptr[i];
	}

	return ((bits >> 12) & 0xF) | (bits >> 28);
}

u8 StencilBits8888(const u8 *ptr8, u32 numPixels) {
	const u32 *ptr = (const u32 *)ptr8;
	u32 bits = 0;

	for (u32 i = 0; i < numPixels; ++i) {
		bits |= ptr[i];
	}

	return bits >> 24;
}