Cesarus85--mjolnir-vr/libs/d3d8/memory.cpp

/* Reconstructed from the supplied January 2002 D3D memory object. */
#include <xtl.h>
#pragma code_seg("D3D")
extern "C" void *WINAPI D3D_AllocNoncontiguousMemory(
    DWORD size)
{
    return LocalAlloc(LMEM_ZEROINIT, size);
}
extern "C" HLOCAL WINAPI D3D_FreeNoncontiguousMemory(
    void *memory)
{
    return LocalFree(memory);
}
void *WINAPI D3D_AllocContiguousMemory(
    DWORD size,
    DWORD alignment)
{
    return XPhysicalAlloc(size, MAXULONG_PTR, alignment, PAGE_READWRITE | PAGE_WRITECOMBINE);
}
void WINAPI D3D_FreeContiguousMemory(
    void *memory)
{
    if (memory)
    {
        XPhysicalFree(memory);
    }
    return;
}

/* Rectangle-copy algorithm adapted from RXDK-Libs, 2026 Team Resurgent,
 * GPL-3.0-or-later. January's routine accepts bytes-per-pixel, not a
 * hardware format code. See libs/d3d8/PROVENANCE.md. */
#include "push_internal.h"
#include "memory_internal.h"
namespace D3D
{
void WINAPI GPUCopyVideoRectangle(
    DWORD bytesPerPixel,
    DWORD sourceOffset,
    DWORD sourcePitch,
    DWORD destinationOffset,
    DWORD destinationPitch,
    DWORD count,
    RECT *rectangles,
    POINT *points)
{
    CDevice *device = g_pDevice;
    DWORD *push = device->StartPush();
    DWORD format;
    switch (bytesPerPixel)
    {
    case 1: format = 1; break;
    case 2: format = 4; break;
    case 4: format = 10; break;
    default: format = 10; break;
    }
    Push4(push, SUBCH_RECTCOPYSURFACES, 0x300, format,
        (sourcePitch & 0xffff) | (destinationPitch << 16), sourceOffset, destinationOffset);
    device->EndPush(push + 5);
    while (count--)
    {
        push = device->StartPush();
        DWORD sourcePoint = ((DWORD)rectangles->left & 0xffff) | ((DWORD)rectangles->top << 16);
        DWORD destinationPoint = ((DWORD)points->x & 0xffff) | ((DWORD)points->y << 16);
        /* Disjoint 16-bit fields; XOR is the target's combining operation. */
        DWORD size = (((DWORD)rectangles->right - (DWORD)rectangles->left) & 0xffff)
            ^ (((DWORD)rectangles->bottom - (DWORD)rectangles->top) << 16);
        Push3(push, SUBCH_RECTCOPY, 0x300, sourcePoint, destinationPoint, size);
        device->EndPush(push + 4);
        rectangles++;
        points++;
    }
    return;
}
}

#include "pusher_state.h"
#include "notification_internal.h"
namespace D3D
{
void WINAPI GPUCopyMemory(
    DWORD sourceOffset,
    DWORD destinationOffset,
    DWORD size)
{
    CDevice *device = g_pDevice;
    volatile NvNotification *notifiers = device->m_pMemCopyNotifiers;
    DWORD initial[2];
    initial[0] = notifiers[0].timeStamp.nanoseconds[0];
    initial[1] = notifiers[0].timeStamp.nanoseconds[1];
    if (size)
    {
        do
        {
            DWORD width, height, remaining;
            if (size <= 8192)
            {
                width = size;
                height = 1;
                remaining = 0;
            }
            else
            {
                width = 8192;
                height = size / 8192;
                if (height <= 2047)
                {
                    remaining = size % 8192;
                }
                else
                {
                    height = 2047;
                    remaining = size - width * height;
                }
            }
            DWORD *push = device->StartPush();
            if (!remaining)
            {
                Push1(push, SUBCH_MEMCOPY, 0x104, 0);
                push += 2;
            }
            PushCount(push, SUBCH_MEMCOPY, 0x184, 2);
            push[1] = 5;
            push[2] = 4;
            PushCount(push + 3, SUBCH_MEMCOPY, 0x30c, 8);
            push[4] = sourceOffset;
            push[5] = destinationOffset;
            push[6] = width;
            push[7] = width;
            push[8] = width;
            push[9] = height;
            push[10] = 0x101;
            push[11] = 0;
            device->EndPush(push + 12);
            sourceOffset += size - remaining;
            destinationOffset += size - remaining;
            size = remaining;
        } while (size);
        device->KickOff();
        while (initial[0] == notifiers[0].timeStamp.nanoseconds[0] &&
            initial[1] == notifiers[0].timeStamp.nanoseconds[1])
        {
            BusyLoop();
        }
        DWORD completedHigh = notifiers[0].timeStamp.nanoseconds[1];
        DWORD completedLow = notifiers[0].timeStamp.nanoseconds[0];
        for (;;)
        {
            DWORD otherHigh = notifiers[1].timeStamp.nanoseconds[1];
            if (otherHigh > completedHigh ||
                (otherHigh == completedHigh && notifiers[1].timeStamp.nanoseconds[0] >= completedLow))
            {
                break;
            }
            BusyLoop();
        }
    }
    return;
}
}