gpubuffertypes.h

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#pragma once
//------------------------------------------------------------------------------
#include "resources/resource.h"
 
//------------------------------------------------------------------------------
namespace CoreGraphics
{
namespace GpuBufferTypes
{
    enum Usage
    {
        UsageImmutable,      //> read only on GPU, upload once on CPU, never read back
        UsageDynamic,        //> same as immutable, except supports multiple CPU uploads
        UsageCpu,            //> same as dynamic, but can also be read by CPU
    };
 
    // cpu access flags
    enum Access
    {
        AccessNone          = 0,                            // CPU does not require access to the resource (best)
        AccessWrite         = 1,                            // CPU has write access
        AccessRead          = 2,                            // CPU has read access
        AccessReadWrite     = AccessWrite + AccessRead,     // CPU has read/write access
    };
 
    // mapping types
    enum MapType
    {
        MapRead                 = 1,                        // gain read access, must be UsageDynamic and AccessRead
        MapWrite                = 2,                        // gain write access, must be UsageDynamic and AccessWrite
        MapReadWrite            = MapRead + MapWrite,       // gain read/write access, must be UsageDynamic and AccessReadWrite
        MapWriteDiscard         = 4,                        // gain write access, discard previous content, must be UsageDynamic and AccessWrite
        MapWriteNoOverwrite     = 8,                        // gain write access, must be UsageDynamic and AccessWrite, see D3D10 docs for details
    };
 
    struct SetupFlags
    {
        CoreGraphics::GpuBufferTypes::Usage usage;
        CoreGraphics::GpuBufferTypes::Access access;
    };
};
 
} // namespace CoreGraphics
//------------------------------------------------------------------------------