xref: /CafeSDK-2.12.13-1/system/include/cafe/gx2/gx2Surface.h

/*---------------------------------------------------------------------------*

  Copyright (C) Nintendo.  All rights reserved.

  These coded instructions, statements, and computer programs contain
  proprietary information of Nintendo of America Inc. and/or Nintendo
  Company Ltd., and are protected by Federal copyright law.  They may
  not be disclosed to third parties or copied or duplicated in any form,
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 *---------------------------------------------------------------------------*/
// -------------------------------------------------------
// gx2Surface.h       (Shared between PC:gtxConvert and Gx2)
//
// Declares surface-related types & functions for gx2 library.
//
//   Note.  Data structures in this file exist in serialized
//   format in .gtx texture files.  Modifying any of the structures
//   hence runs huge risk of invalidating any or all texture files.
//
//  Also - do not add non 32-bit/element fields into these data structures,
//  they may not serialize correctly.
// -------------------------------------------------------

#ifndef _CAFE_GX2_SURFACE_H_
#define _CAFE_GX2_SURFACE_H_

#include <cafe/gx2/gx2rResource.h>

#ifdef __cplusplus
extern "C" {
#endif

/// @addtogroup GX2SurfaceGroup
/// @{

/// @addtogroup GX2SurfaceAllGroup
/// @{

//----------------------------------------------------------------------
// Defines

/// \brief The number of registers used to describe textures
#define GX2_NUM_TEXTURE_REGISTERS      5

/// \brief The number of registers used to describe color buffers
///
#define GX2_NUM_COLOR_BUFFER_REGISTERS 5

/// \brief The number of registers used to describe depth/stencil buffers
///
#define GX2_NUM_DEPTH_BUFFER_REGISTERS 7

/// \brief The number of registers used to describe HiStencil pretest state
///
#define GX2_NUM_HISTENCIL_STATES 2

/// \brief Minimum offset from pixel center of MSAA buffer. It ranges -8/16 to 7/16.
///
#define GX2_MSAA_SAMPLE_LOCATION_MIN  -8

/// \brief Maximum offset from pixel center at MSAA buffer. It ranges -8/16 to 7/16.
///
#define GX2_MSAA_SAMPLE_LOCATION_MAX   7

//----------------------------------------------------------------------
// Structures

// !!!Note!!! - The GX2Surface structure is burned into .gtx file.
// Altering parameters or changing their order may invalidate all existing content.


/// \brief Describes a "surface", the common base element of textures, color & depth buffers.
///
/// Since surfaces are very complex, all the user parameters are encapsulated in this structure.
/// In addition, there are fields for some computed values that are useful both for the user
/// as well as for certain APIs.  They are stored here to avoid calculating them multiple times.
/// Whenever a user value is changed, it's a good idea to call GX2CalcSurfaceSizeAndAlignment.
///
#ifdef __ghs__
#pragma ghs nowarning 619 // "nonstandard unnamed field" for anonymous union when compiled as C
#endif
typedef struct _GX2Surface {
    // Caution: This structure is serialized in the .gtx file format.
    // Don't add non 32-bit per element sized fields; they may not transfer correctly.
    /// (user) dimension: 1D, 2D, 3D, etc.
    GX2SurfaceDim dim;
    /// (user) size of s (x) dimension in pixels
    u32 width;
    /// (user) size of t (y) dimension in pixels
    u32 height;
    /// (user) size of r (p, z) dimension in pixels. 0 implies 1.
    u32 depth;

    /// (user) number of mip levels, counting base level 0 as 1. 0 implies 1.
    u32 numMips;

    /// (user) image format
    GX2SurfaceFormat format;
    /// (user) antialiasing mode
    GX2AAMode aa;
    union {
    /// (user) intended use (texture, color buffer, etc) (if not using GX2R)
    GX2SurfaceUse       use;
    /// (user) type, semantics and options, if using GX2R
    GX2RResourceFlags   resourceFlags;
    };

    /// (calc) size of texture base image (level 0), in bytes
    u32   imageSize;
    union {
    /// (user) pointer to texture base image (level 0)
    void *imagePtr;
    void *pMem;
    };
    /// (calc) size of mipmap pyramid (levels 1+), in bytes.  May be 0.
    u32   mipSize;
    /// (user) pointer to mipmap pyramid (levels 1+).  May be NULL.
    void *mipPtr;

    /// (special) base tiling mode for the texture
    GX2TileMode tileMode;
    /// (special) pipe and bank swizzle modes for optimizing memory access
    /// The lower 8 bits are 0 and unused. The next 8 bits are the swizzle value, of which only
    /// values 0 through 7 are valid (set using GX2SetSurfaceSwizzle). The next 8 bits are
    /// the mip-level at which the hardware stops swizzling and switches to using 1D tiling modes (calculated; not set by the user).
    u32 swizzle;

    /// (calc) alignment to use when allocating image and mip levels, in bytes
    u32 alignment;
    /// (calc) used internally to set registers; padded image width in elements (pixels or BC 4x4 tiles)
    u32 pitch;

    /// \brief (calc) Offsets to each mip level, in bytes.
    ///
    /// mipOffset[0] is special: it can be used to place levels 1+ after the base map.
    /// (It indicates the size of the base map plus the padding needed for level 1.)
    /// It should not be used for any other purpose.
    ///
    /// The location of a mip level image should be found only as follows:
    /// - level 0 is given by imagePtr
    /// - level 1 is given by mipPtr
    /// - levels 2+ are given by (u32) mipPtr + mipOffset[level-1]
    ///
    /// \note This array is computed to reflect what the mipmapping hardware does intrinsically.
    /// Altering it will not change the hardware's behavior.
    /// It is provided to help software find the mip data when needed.
    ///
    u32 mipOffset[ 13 ]; // TODO: use GX2_LOG2_MAX_TEXTURE_SIZE instead

} GX2Surface;
#ifdef __ghs__
#pragma ghs endnowarning
#endif

/// @}
/// @addtogroup GX2SurfaceColorGroup
/// @{

/// \brief Completely describes a color buffer (i.e., render target).
///
/// In addition to GX2Surface, includes user fields to describe a color buffer.
/// Also includes hardware register settings for the same purpose.
/// It allows rendering to a given mip level or array slice.
///
typedef struct _GX2ColorBuffer {

    /// main surface description
    GX2Surface surface;

    /// (user) mip level to use (usually 0)
    u32 viewMip;
    /// (user) start slice in the array or 3D surface (usually 0)
    u32 viewFirstSlice;
    /// (user) number of slices (usually 1)
    u32 viewNumSlices;

    /// Auxiliary buffer (for AA only) address
    void *auxPtr;
    /// Auxiliary buffer (for AA only) size
    u32  auxSize;

    /// (calc) private, calculated by driver
    u32 _regs[GX2_NUM_COLOR_BUFFER_REGISTERS];

} GX2ColorBuffer;

/// @}
/// @addtogroup GX2SurfaceDepthGroup
/// @{

/// \brief Completely describes a depth/stencil buffer.
///
/// In addition to GX2Surface, includes user fields to describe a depth/stencil buffer.
/// Also includes hardware register settings for the same purpose.
/// It allows rendering to a given mip level or array slice.
///
typedef struct _GX2DepthBuffer {

    /// main surface description
    GX2Surface surface;

    /// (user) mip level to use (usually 0)
    u32 viewMip;
    /// (user) start slice in the array or 3D surface (usually 0)
    u32 viewFirstSlice;
    /// (user) number of slices (usually 1)
    u32 viewNumSlices;

    /// Hierarchical Z buffer address (optional)
    void *hiZPtr;
    /// Hierarchical Z buffer size (optional)
    u32  hiZSize;

    /// (user) Value to use when clearing the depth buffer
    f32 clearDepth;
    /// (user) Value to use when clearing the stencil buffer. Only the least significant 8 bits are valid.
    u32 clearStencil;

    /// (calc) private, calculated by driver
    u32 _regs[GX2_NUM_DEPTH_BUFFER_REGISTERS];

} GX2DepthBuffer;

/// \brief Describes a single HiStencil pretest state.
///
/// Supplied to \ref GX2HiStencilInfo to completely describe HiStencil pretest state
///
typedef struct _GX2HiStencilState {

    /// (user) compare function
    GX2CompareFunction function;
    /// (user) reference value
    u8 reference;
    /// (user) mask
    u8 mask;
    /// (user) enable
    GX2Boolean enable;

} GX2HiStencilState;

/// \brief Describes all HiStencil pretest states.
///
/// Must be used in conjunction w/ GX2DepthBuffer to completely describe depth/stencil buffer
///
typedef struct _GX2HiStencilInfo {

    /// (user) compare function
    GX2HiStencilState state[GX2_NUM_HISTENCIL_STATES];

    /// (calc) private, calculated by driver
    u32 _regs[GX2_NUM_HISTENCIL_STATES];

} GX2HiStencilInfo;

/// @}
/// @addtogroup GX2SurfaceAllGroup
/// @{

// Rectangular region
// left, top are inclusive.
// right, bottom are exclusive
// 0,0 is the upper left of the surface
typedef struct _GX2RectInt {
    s32 left;
    s32 top;
    s32 right;
    s32 bottom;
} GX2RectInt;

// A point
// 0,0 is the upper left of the surface
typedef struct _GX2PointInt {
    s32 x;
    s32 y;
} GX2PointInt;

// An AA sampling point
// 0,0 is center of the AA sampling point
// It ranges -8 to 7 offset from pixel center.
typedef struct _GX2AASampleLoc {
    s8 x[8];
    s8 y[8];
} GX2AASampleLoc;

/// @}
/// @addtogroup GX2SurfaceAllGroup
/// @{

//----------------------------------------------------------------------
// Functions

/// \brief Given a surface structure with user fields set, fill in size & other computed values.
///
/// \note  There is presently a bug in this function concerning the selection of tile mode
///        to use for BCx compressed textures below a certain size (128x64 pixels).  If given
///        GX2_TILE_MODE_DEFAULT, the function will choose GX2_TILE_MODE_2D_TILED_THIN1.
///        However, it should choose GX2_TILE_MODE_1D_TILED_THIN1 for BCx textures below the
///        size of 128x64 pixels.  This affects the main image (mip 0) calculation.  The
///        function will correctly recognize that the smaller mip levels are all 1D tiled.
///        This function will be fixed in a future SDK; you should work around it in the mean
///        time by avoiding the use of GX2_TILE_MODE_DEFAULT for BCx textures below 128x64
///        pixels (use GX2_TILE_MODE_1D_TILED_THIN1 instead).
///
/// \param surface Ptr to surface structure to update
///
/// \donotcall \threadsafe \devonly \enddonotcall
///
void GX2API GX2CalcSurfaceSizeAndAlignment(GX2Surface *surface);

/// @}
/// @addtogroup GX2SurfaceColorGroup
/// @{

/// \brief Given an initialized color buffer, calculate the size and alignment
/// for the aux (AA) buffer.  AA surfaces must have an aux buffer set up.
///
/// \param colorBuffer Ptr to initialized colorBuffer structure to inquire about
/// \param pSize   Ptr to u32 to hold calculated size
/// \param pAlign  Ptr to u32 to hold calculated alignment
///
/// \donotcall \threadsafe \devonly \enddonotcall
///
void GX2API GX2CalcColorBufferAuxInfo(GX2ColorBuffer *colorBuffer, u32 *pSize,
                                      u32 *pAlign);

/// \brief Given a color buffer structure with user fields set, fill in register values.
///
/// \param colorBuffer Ptr to color buffer structure to update.
///
/// \donotcall \threadsafe \devonly \enddonotcall
///
void GX2API GX2InitColorBufferRegs(GX2ColorBuffer *colorBuffer);

/// @}
/// @addtogroup GX2SurfaceDepthGroup
/// @{

/// \brief Given an initialized depth buffer, calculate the size and alignment
/// for the Hi-Z buffer.  The Hi-Z buffer is optional; it improves performance.
///
/// \param depthBuffer Ptr to initialized depthBuffer structure to inquire about
/// \param pSize   Ptr to u32 to hold calculated size
/// \param pAlign  Ptr to u32 to hold calculated alignment
///
/// \donotcall \threadsafe \devonly \enddonotcall
///
void GX2API GX2CalcDepthBufferHiZInfo(GX2DepthBuffer *depthBuffer, u32 *pSize,
                                      u32 *pAlign);

/// \brief Given a depth buffer structure with user fields set, fill in register values.
///
/// \param depthBuffer Ptr to depth buffer structure to update.
///
/// \donotcall \threadsafe \devonly \enddonotcall
///
void GX2API GX2InitDepthBufferRegs(GX2DepthBuffer *depthBuffer);

/// \brief Allows setting the Hi-Z enable bit within a depth buffer structure
///
/// \note The Hi-Z buffer ptr must be set (\ref GX2InitDepthBufferHiZPtr)
///       before enabling Hi-Z
///
/// \param depthBuffer Ptr to depth buffer structure to update.
/// \param hiZEnable boolean indicating whether hiZ should be enabled.
///
/// \donotcall \threadsafe \devonly \enddonotcall
///
void GX2API GX2InitDepthBufferHiZEnable(GX2DepthBuffer *depthBuffer,
                                        GX2Boolean hiZEnable);

/// \brief Allows setting the Z Range Base within a depth buffer structure.
///
/// This function sets the Z Range Base setting for HiZ testing. The default
/// state is \ref GX2_ZRANGE_BASE_ZMIN (ideal for \ref GX2_COMPARE_GREATER and
/// \ref GX2_COMPARE_GEQUAL). Otherwise, \ref GX2_ZRANGE_BASE_ZMAX should be
/// used.
///
/// \note This routine should be executed after \ref GX2InitDepthBufferRegs.
///       Calling GX2InitDepthBufferRegs will reset this back to
///       \ref GX2_ZRANGE_BASE_ZMIN.
///
/// \warning The depth buffer must be clear or about to be cleared when the Z
///          Range Base is changed or depth buffer corruption may result.
///
/// \param depthBuffer Ptr to depth buffer structure to update.
/// \param rangeBase enum indicating which Z Range Base to use.
///
/// \donotcall \threadsafe \devonly \enddonotcall
///
void GX2API GX2InitDepthBufferRangeBase(GX2DepthBuffer *depthBuffer,
                                        GX2ZRangeBase rangeBase);

/// \brief Given a HiStencilInfo structure with user fields set, fill in register values.
///
/// \param hiStencilInfo A set of 2 HiStencil pretest states.
///
void GX2API GX2InitHiStencilInfoRegs(GX2HiStencilInfo *hiStencilInfo);

/// \brief Helper function to set up HiStencilInfo structure in a convenient way.
///
/// \param hiStencilInfo Ptr to HiStencil info structure to update.
/// \param state0 A HiStencil pretest state
/// \param state1 A HiStencil pretest state
///
GX2_INLINE void GX2InitHiStencilInfo(GX2HiStencilInfo *hiStencilInfo, GX2HiStencilState *state0, GX2HiStencilState *state1)
{
    ASSERT(hiStencilInfo);

    if (state0)
        hiStencilInfo->state[0] = *state0;

    if (state1)
        hiStencilInfo->state[1] = *state1;

    GX2InitHiStencilInfoRegs(hiStencilInfo);
}

/// @}
/// @addtogroup GX2SurfaceColorGroup
/// @{

/// \brief Sets the given color buffer to be used as the given render target.
///
/// The 'use' field must indicate color buffer usage.
///
/// \note These set functions always update the address register based upon
///       the user-provided pointer (thus there is no need to call the init
///       function again when only changing the address pointer).
///
/// \note The AA value within the given colorBuffer will only be set to the hardware
///       when the target parameter is 0 (or GX2_RENDER_TARGET_0).  The AA values for the
///       depth buffer and all color buffers which are in use must match.  GX2 currently
///       does not verify this requirement. See Also \ref GX2SetAAMode().
///
/// \note Warning: This function does not set the scissor box to the size of the color
///       buffer. To prevent writing outside of the color buffer, \ref GX2SetScissor should be
///       called in conjunction this function.
///
/// \param colorBuffer Ptr to color buffer structure to use; all fields & registers should already be initialized.
/// \param target Which render target to configure
///
/// \donotcall \gx2_typical \enddonotcall
///
/// \writesgpu
/// \alwayswritesgpu
///
void GX2API GX2SetColorBuffer(const GX2ColorBuffer *colorBuffer,
                              GX2RenderTarget target);

/// @}
/// @addtogroup GX2SurfaceDepthGroup
/// @{

/// \brief Sets the given depth buffer to be used as the depth/stencil target.
///
/// The 'use' field must indicate depth buffer usage.
///
/// \note These set functions always update the address register based upon
///       the user-provided pointer (thus there is no need to call the init
///       function again when only changing the address pointer).
///
/// \note Warning: This function doesn't set the AA registers. When setting just a depth
///       buffer, verify that the AA mode of this depth buffer matches that of the last
///       color buffer that was set, or call /ref GX2SetAAMode() if you need to explicitly
///       set the AA mode for the depth buffer.
///
/// \warning This function does not set the scissor box to the size of the color
///       buffer. To prevent writing outside of the color buffer, \ref GX2SetScissor should be
///       called in conjunction this function.
///
/// \param depthBuffer Ptr to depth buffer structure to use; all fields & registers should already be initialized.
///
/// \donotcall \gx2_typical \enddonotcall
///
/// \writesgpu
/// \alwayswritesgpu
///
void GX2API GX2SetDepthBuffer(const GX2DepthBuffer *depthBuffer);

/// \brief Sets the given HiStencil info to be used as the HiStencil pretest state.
///
/// Must be used in conjunction with \ref GX2SetDepthBuffer in order to fully
/// describe the depth/stencil buffer when HiStencil is used.
///
/// \param hiStencilInfo Ptr to HiStencil info structure to use; all fields & registers should already be initialized.
///
void GX2API GX2SetHiStencilInfo(const GX2HiStencilInfo *hiStencilInfo);

/// @}
/// @addtogroup GX2SurfaceColorGroup
/// @{

/// \brief Helper function for initializing color buffers
///
/// \warning Do not use this function. Instead use
/// \ref GX2InitColorBufferFTV or \ref GX2InitColorBuffer.
///
/// \donotcall \threadsafe \devonly \enddonotcall
///
GX2_INLINE void _GX2InitColorBuffer(GX2ColorBuffer *colorBuffer,
                               u32 width, u32 height,
                               GX2SurfaceFormat format, GX2AAMode aa)
{
    GX2_CHECK_ENUM_RANGE(format, GX2_SURFACE_FORMAT)
    GX2_CHECK_ENUM_RANGE(aa, GX2_AA_MODE)

    colorBuffer->surface.dim = GX2_SURFACE_DIM_2D;
    colorBuffer->surface.width = width;
    colorBuffer->surface.height = height;
    colorBuffer->surface.depth = 1;
    colorBuffer->surface.numMips = 1; // 1 means base level only
    colorBuffer->surface.mipPtr = NULL;
    colorBuffer->surface.format = format;
    colorBuffer->surface.aa = aa;
    // colorBuffer->surface.use set by wrapping function
#ifdef GX2_ENABLE_FIX2197
    colorBuffer->surface.tileMode = GX2_TILE_MODE_DEFAULT_FIX2197;
#else
    colorBuffer->surface.tileMode = GX2_TILE_MODE_DEFAULT;
#endif
    colorBuffer->surface.swizzle  = 0;
    colorBuffer->viewMip = 0;
    colorBuffer->viewFirstSlice = 0;
    colorBuffer->viewNumSlices = 1;
    GX2CalcSurfaceSizeAndAlignment(&colorBuffer->surface);
#ifndef GX2_SURFACE_STANDALONE
    GX2InitColorBufferRegs(colorBuffer);
#endif
}

/// \brief Helper function to set up color buffer structure in a convenient way.
///
/// \note  Certain fields are set to typical default values.  If you wish to non-default
///        values, then those fields must be set manually.  You may need to call
///        \ref GX2CalcSurfaceSizeAndAlignment or \ref GX2InitColorBufferRegs after
///        changing certain fields.
///
/// \param colorBuffer Ptr to color buffer structure to initialize.
/// \param width  Desired width for color buffer.
/// \param height Desired height for color buffer.
/// \param format Desired surface format for color buffer.
/// \param aa     Desired AA mode for color buffer.
///
/// \donotcall \threadsafe \devonly \enddonotcall
///
GX2_INLINE void GX2InitColorBuffer(GX2ColorBuffer *colorBuffer,
                               u32 width, u32 height,
                               GX2SurfaceFormat format, GX2AAMode aa)
{
    colorBuffer->surface.use = GX2_SURFACE_USE_COLOR_BUFFER_TEXTURE;
    _GX2InitColorBuffer(colorBuffer, width, height, format, aa);
}

/// \brief Helper function to set up color buffer image pointer.
///
/// \note This function only changes the image pointer, not the mip pointer,
///       which is normally not relevant to color buffers unless you're rendering to a mip level.
///
/// \param colorBuffer Ptr to color buffer structure to update.
/// \param ptr New image pointer value.
///
/// \donotcall \threadsafe \devonly \enddonotcall
///
GX2_INLINE void GX2InitColorBufferPtr(GX2ColorBuffer *colorBuffer, void *ptr)
{
    colorBuffer->surface.imagePtr = ptr;
}

/// \brief Helper function to set up color buffer aux (AA) pointer.
///
/// \note This function only needs to be called for AA surfaces.
///       AA surfaces must have an aux buffer set up.
/// \note The auxPtr buffer must be initialized to \ref GX2_AUX_BUFFER_CLEAR_VALUE.
///
/// \param colorBuffer Ptr to color buffer structure to update.
/// \param auxPtr New aux buffer pointer value.
///
/// \donotcall \threadsafe \devonly \enddonotcall
///
GX2_INLINE void GX2InitColorBufferAuxPtr(GX2ColorBuffer *colorBuffer, void *auxPtr)
{
    colorBuffer->auxPtr = auxPtr;
}

/// \brief Helper function to set up color buffer that is a final TV render target.
///
/// A "final" TV render target is one that will be copied to a TV scan buffer.
/// It needs to be designated to handle certain display corner cases.
/// (When a HD surface must be scaled down to display in NTSC/PAL.)
///
/// In cases when the surface must be scaled down for proper display,
/// if the requested surface was AA, then AA will be disabled.
/// This is required to work around certain hardware limitations
/// (this avoids performance penalties from other possible work-arounds).
/// To see if AA was disabled, check the value of the surface->aa field
/// after making this call.
///
/// An alternate solution to having the AA disabled is to instead choose a
/// final TV render target size that matches the reduced-size scan buffer.
/// See the \ref GX2DisplayPage page for details.
///
/// \note  Certain fields are set to typical default values.  If you wish to non-default
///        values, then those fields must be set manually.  You may need to call
///        \ref GX2CalcSurfaceSizeAndAlignment or \ref GX2InitColorBufferRegs after
///        changing certain fields.
///
/// \param colorBuffer Ptr to color buffer structure to initialize.
/// \param width  Desired width for color buffer.
/// \param height Desired height for color buffer.
/// \param format Desired surface format for color buffer.
/// \param aa     Desired AA mode for color buffer.
///
/// \donotcall \threadsafe \devonly \enddonotcall
///
GX2_INLINE void GX2InitColorBufferFTV(GX2ColorBuffer *colorBuffer,
                                      u32 width, u32 height,
                                      GX2SurfaceFormat format, GX2AAMode aa)
{
    colorBuffer->surface.use = GX2_SURFACE_USE_COLOR_BUFFER_TEXTURE_FTV;
    _GX2InitColorBuffer(colorBuffer, width, height, format, aa);
    // If aa was disabled, pad size/align to what aa would have required
    if (colorBuffer->surface.aa != aa) {
        GX2Surface paddedSurf = colorBuffer->surface;
        paddedSurf.aa = aa;
        paddedSurf.use = GX2_SURFACE_USE_COLOR_BUFFER_TEXTURE;
        GX2CalcSurfaceSizeAndAlignment(&paddedSurf);
        ASSERT(colorBuffer->surface.imageSize <= paddedSurf.imageSize);
        ASSERT(colorBuffer->surface.alignment <= paddedSurf.alignment);
        colorBuffer->surface.imageSize = paddedSurf.imageSize;
        colorBuffer->surface.alignment = paddedSurf.alignment;
    }
}

/// @}
/// @addtogroup GX2SurfaceDepthGroup
/// @{

/// \brief Helper function to set up depth buffer structure in a convenient way.
///
/// \note  Certain fields are set to typical default values.  If you wish to non-default
///        values, then those fields must be set manually.  You may need to call
///        \ref GX2CalcSurfaceSizeAndAlignment or \ref GX2InitDepthBufferRegs after
///        changing certain fields.
///
/// \param depthBuffer Ptr to depth buffer structure to initialize.
/// \param width  Desired width for depth buffer.
/// \param height Desired height for depth buffer.
/// \param format Desired surface format for depth buffer.
/// \param aa     Desired AA mode for depth buffer.
///
/// \donotcall \threadsafe \devonly \enddonotcall
///
GX2_INLINE void GX2InitDepthBuffer(GX2DepthBuffer *depthBuffer,
                               u32 width, u32 height,
                               GX2SurfaceFormat format, GX2AAMode aa)
{
    GX2_CHECK_ENUM_RANGE(format, GX2_SURFACE_FORMAT)
    GX2_CHECK_ENUM_RANGE(aa, GX2_AA_MODE)

    depthBuffer->surface.dim = GX2_SURFACE_DIM_2D;
    depthBuffer->surface.width = width;
    depthBuffer->surface.height = height;
    depthBuffer->surface.depth = 1;
    depthBuffer->surface.numMips = 1; // 1 means base level only
    depthBuffer->surface.format = format;
    depthBuffer->surface.aa = aa;
    depthBuffer->surface.use = ((format==GX2_SURFACE_FORMAT_D_D24_S8_UNORM) || (format==GX2_SURFACE_FORMAT_D_D24_S8_FLOAT)) ? GX2_SURFACE_USE_DEPTH_BUFFER : GX2_SURFACE_USE_DEPTH_BUFFER_TEXTURE;
    depthBuffer->surface.tileMode = GX2_TILE_MODE_DEFAULT;
    depthBuffer->surface.swizzle  = 0;
    depthBuffer->viewMip = 0;
    depthBuffer->viewFirstSlice = 0;
    depthBuffer->viewNumSlices = 1;
    depthBuffer->hiZPtr=NULL;
    depthBuffer->hiZSize=0;
    depthBuffer->clearDepth = 1.0f;
    depthBuffer->clearStencil = 0;
    GX2CalcSurfaceSizeAndAlignment(&depthBuffer->surface);
#ifndef GX2_SURFACE_STANDALONE
    GX2InitDepthBufferRegs(depthBuffer);
#endif
}

/// \brief Helper function to set up depth buffer image pointer
///
/// \note This function only changes the image pointer, not the mip pointer,
///       which is normally not relevant to depth buffers unless you're rendering to a mip level.
///
/// \param depthBuffer Ptr to depth buffer structure to update.
/// \param ptr New image pointer value.
///
/// \donotcall \threadsafe \devonly \enddonotcall
///
GX2_INLINE void GX2InitDepthBufferPtr(GX2DepthBuffer *depthBuffer, void *ptr)
{
    depthBuffer->surface.imagePtr = ptr;
}

/// \brief Helper function to set up depth buffer Hi-Z pointer.
///
/// Hierarchical Z-buffer is optional; it improves depth testing performance.
///
/// \param depthBuffer Ptr to depth buffer structure to update.
/// \param hiZPtr New Hi-Z buffer pointer value.
///
/// \donotcall \threadsafe \devonly \enddonotcall
///
GX2_INLINE void GX2InitDepthBufferHiZPtr(GX2DepthBuffer *depthBuffer, void *hiZPtr)
{
    depthBuffer->hiZPtr = hiZPtr;
    GX2InitDepthBufferHiZEnable(depthBuffer, (GX2Boolean)(hiZPtr != NULL));
}

/// @}
/// @addtogroup GX2SurfaceCopyGroup
/// @{

/// \brief Copies the specified source surface to dest surface.
///
/// Only copies a single 2D mip slice at most.  The copy will be done by
/// the GPU, unless a surface uses LINEAR_SPECIAL tile format, in which case
/// a CPU copy is performed.  For CPU copies, you may need to synchronize with
/// the GPU (by calling \ref GX2DrawDone, for instance).
///
/// \note This API may change rendering states and disable state shadowing.
///       It may alter registers that cannot be restored by common GX2 functions.
///       Therefore you should always call \ref GX2SetContextState() afterward
///       (except when doing CPU copies).
///
/// \note The source and destinations surfaces must be the same format and have
///       the same dimensions.  Stretching is not supported.
///
/// \note Copying of format GX2_SURFACE_FORMAT_T_NV12_UNORM is currently not
///       supported.
///
/// \note Compressed textures must be copied on a 4x4 pixel alignment.
///       Coordinates are in terms of pixels, not blocks.
///
/// \note CPU copies are very slow and should normally be avoided.
///
/// \param srcSurface  Pointer to source surface structure
/// \param srcMip      Mip level of surface to read (0 typically)
/// \param srcSlice    Slice to read for array & 3D (0 typically)
/// \param dstSurface  Pointer to destination surface structure
/// \param dstMip      Mip level of dest surface to write (0 typically)
/// \param dstSlice    Slice to write for array & 3D (0 typically)
///
/// \donotcall \gx2_typical \enddonotcall
///
/// \clobberstate If source or destination mode are GX2_TILE_MODE_LINEAR_SPECIAL this does not clobber state.
/// \disablesstateshadow If source or destination mode are GX2_TILE_MODE_LINEAR_SPECIAL this does not disable state shadowing.
/// \notincompute
///
/// \writesgpu
/// \writesgpu{if source and destination tiling modes are not \ref GX2_TILE_MODE_LINEAR_SPECIAL}
///
void GX2API GX2CopySurface(const GX2Surface *srcSurface, u32 srcMip, u32 srcSlice,
                           GX2Surface *dstSurface, u32 dstMip, u32 dstSlice);


/// \brief Copies the specified source surface sub-rectangles to the dest surface at specified points.
///
/// Only copies from and to a single 2D mip slice at most.  This API does not support buffers that use
/// LINEAR_SPECIAL tiling.  All operations are performed using the GPU.
///
/// \note This API may change rendering states and disable state shadowing.
///       It may alter registers that cannot be restored by common GX2 functions.
///       Therefore you should always call \ref GX2SetContextState() afterward
///       (except when doing CPU copies).
///
/// \note The source and destinations surfaces must be the same format and
///       stretching is not supported.
///
/// \note The source rectangles and destination points should be in dimensions
///       relative to srcMip/dstMip and not the base level.
///       For example, if the base level of the texture is 100x100 and you
///       wanted to copy all of srcMip = 1, then the source
///       rectangle would be from (0,0) to (50x50), since the size of the src
///       mip is 50 (100/2) on each side.
///
/// \note Copying of format GX2_SURFACE_FORMAT_T_NV12_UNORM is currently not
///       supported.
///
/// \note CPU copies are very slow and should normally be avoided.
///
/// \param srcSurface  Pointer to source surface structure
/// \param srcMip      Mip level of surface to read (0 typically)
/// \param srcSlice    Slice to read for array & 3D (0 typically)
/// \param dstSurface  Pointer to destination surface structure
/// \param dstMip      Mip level of dest surface to write (0 typically)
/// \param dstSlice    Slice to write for array & 3D (0 typically)
/// \param numRects    The number of source rectangles and destination points that describe the sub-regions to copy (1 typically).
///                    This number cannot be larger than GX2_MAX_COPY_SURFACE_EX_RECTS.
/// \param pSrcRects   A pointer to an array of source rectangles describing the region of srcSurface to copy from.
/// \param pDstPoints  A pointer to an array of destination points describing the locations in dstSurface to copy to.
///
/// \donotcall \gx2_typical \enddonotcall
///
/// \clobberstate
/// \disablesstateshadow
/// \notincompute
///
/// \writesgpu
/// \writesgpu{if source and destination tiling modes are not \ref GX2_TILE_MODE_LINEAR_SPECIAL}
///
void GX2API GX2CopySurfaceEx(const GX2Surface *srcSurface, u32 srcMip, u32 srcSlice,
                             GX2Surface *dstSurface, u32 dstMip, u32 dstSlice,
                             u32 numRects, GX2RectInt *pSrcRects, GX2PointInt *pDstPoints);


/// @}
/// @addtogroup GX2SurfaceTileGroup
/// @{

/// \brief Allocates a tiling aperture which allows linear CPU access to a tiled surface.
///
/// To access a pixel/texel in the linear view, use:
/// - pixel address = aperture address + (Y * surface.pitch + X) * bytes_per_pixel
///
/// Note that reading/writing through the tiling aperture is slower than referring to
/// the tiled surface directly.  For just checking a few pixels, this is reasonable.
/// To read/write an entire surface, it is suggested to use a LINEAR_ALIGNED surface
/// instead, and have the GPU convert the linear surface to or from a tiled format.
///
/// \note After writing to a tiling aperture, a "flush" operation is REQUIRED.  The
///       flush is performed by simply reading back an address within the aperture.
///       It ensures that the data has made it to memory, and it also is necessary
///       to prevent a corruption issue that can occur with any GX2 commands that
///       follow.  The flush must therefore be done after any tiling aperture writes
///       and before calling any GX2 APIs that write out GPU commands.
///
/// \note Only ~30 tiling apertures may be created simultaneously.  They should be freed
///       (using \ref GX2FreeTilingAperture) after they are no longer needed.
///       Calling \ref GX2FreeTilingAperture will perform the flush mentioned above.
///
/// \note There is also a limit of ~256MB of aperture space that may be allocated
///       at once.  (This limit may vary in the future.)
///
/// \note There is a hardware bug for 1-byte pixel formats.  The required work-around
///       is to invert two of the address bits when accessing such a surface via the
///       the tiling aperture:
///       - pixel address = aperture address + ((Y^2) * surface.pitch + (X^8))
///
/// \note The tiling APIs are not reentrant (that is, they are not multicore safe).  You should either
///       only call them from a single core, or else add a mutex around calls to them.
///
/// \param pSurface    Pointer to surface structure to be accessed
/// \param mip         Which mip level to view (for textures only, otherwise use 0)
/// \param slice       Which 3D/array slice to view (as appropriate, otherwise use 0)
/// \param mode        Enable endian swap for this area's CPU read/write
/// \param pAppHandle  Returned handle to use when freeing tiling aperture
/// \param pAppAddress Returned base address to use when accessing surface linearly
///
/// \donotcall \gx2_typical \enddonotcall
///
/// \writesgpu
/// \directwritesgpu
///
void GX2API GX2AllocateTilingApertureEx(const GX2Surface *pSurface, u32 mip,
                                       u32 slice, GX2EndianSwapMode mode,
                                       u32 *pAppHandle, void **pAppAddress);


/// \brief Allocates a tiling aperture which allows linear CPU access to a tiled surface.
///
/// This is an inline function that calls \ref GX2AllocateTilingApertureEx with the endian
/// swap mode set to \ref GX2_ENDIANSWAP_NONE.
///
/// \donotcall \gx2_typical \enddonotcall
///
/// \writesgpu
/// \directwritesgpu
///
GX2_INLINE void GX2AllocateTilingAperture(const GX2Surface *pSurface, u32 mip,
                               u32 slice, u32 *pAppHandle, void **pAppAddress)
{
    GX2AllocateTilingApertureEx(pSurface, mip, slice, GX2_ENDIANSWAP_NONE,
                                pAppHandle, pAppAddress);
}

/// \brief Frees a tiling aperture which allows linear CPU access to a tiled surface.
///
/// \param appHandle  Handle to tiling aperture to free
///
/// \donotcall \gx2_typical \enddonotcall
///
/// \writesgpu
/// \directwritesgpu
///
void GX2API GX2FreeTilingAperture(u32 appHandle);

/// @}
/// @addtogroup GX2SurfaceCopyGroup
/// @{

/// \brief Resolves an MSAA color buffer to a single-sample color surface by
/// averaging the multiple sample colors together.  The source buffer is not modified.
///
/// This resolve will use the GPU's fast fixed-function hardware to perform the resolve,
/// however only certain formats are supported.  See the function \ref GX2IsResolveSupported()
/// to see which formats support this fixed-function resolve path.  Calling this function with
/// an unsupported format will assert in a debug build, but result in undefined behavior in a
/// release build.  To perform an MSAA resolve on a format that is not supported by the
/// fixed-function resolve hardware, do not use this function, but instead use a custom shader
/// to blend the MSAA samples (see test\gx2\assets\shaders\simple\texture2DMS.ps) in a draw.
///
/// If srcBuffer contains multiple slices, they will all be resolved to
/// the dstSurface beginning at dstSlice.  This function resolves only the single
/// miplevel specified by srcBuffer->viewMip and dstMip. This function resolves the number of
/// slices specified by srcBuffer->viewNumSlices starting with slice number
/// srcBuffer->viewFirstSlice.
///
/// \note This API changes rendering states and disables state shadowing.
///       It may alter registers that cannot be restored by common GX2 functions.
///       Therefore you should always call \ref GX2SetContextState() afterward.
///
/// \param srcBuffer  Pointer to a compressed MSAA color buffer
/// \param dstSurface Pointer to a single-sample surface
/// \param dstMip     Which mip level to write
/// \param dstSlice   Which 3D/array slice to start writing to
///
/// \donotcall \gx2_typical \enddonotcall
///
/// \clobberstate
/// \disablesstateshadow
/// \notincompute
///
/// \writesgpu
/// \alwayswritesgpu
///
void GX2API GX2ResolveAAColorBuffer(const GX2ColorBuffer *srcBuffer,
                                    GX2Surface *dstSurface,
                                    u32 dstMip, u32 dstSlice);

/// \brief Expands an MSAA color buffer in-place to allow the surface to be
/// used as an MSAA texture.
///
/// It is not necessary to call this function before calling \ref GX2ResolveAAColorBuffer.
/// This function modifies both the MSAA buffer and its auxiliary memory.
/// Subsequent draw calls to this buffer will undo the expand, so this must be
/// called between drawing to the buffer and texturing from it.  It is okay to
/// draw to this buffer after expanding it.
///
/// All slices referred to by buffer->viewFirstSlice and
/// buffer->viewNumSlices will be expanded.  This function resolves only the single
/// miplevel specified by buffer->viewMip.
///
/// \note This API changes rendering states and disables state shadowing.
///       It may alter registers that cannot be restored by common GX2 functions.
///       Therefore you should always call \ref GX2SetContextState() afterward.
///
/// \param buffer Pointer to a compressed MSAA color buffer
///
/// \donotcall \gx2_typical \enddonotcall
///
/// \clobberstate
/// \disablesstateshadow
/// \notincompute
///
/// \writesgpu
/// \alwayswritesgpu
///
void GX2API GX2ExpandAAColorBuffer(GX2ColorBuffer *buffer);

/// \brief Expands a HiZ depth buffer in-place.
///
/// Prepares a HiZ depth buffer to be used as a texture. For the surface
/// to be usable as a texture it must have a \ref GX2SurfaceFormat that
/// is compatible with use as a texture. For example,
/// \ref GX2_SURFACE_FORMAT_D_D24_S8_UNORM cannot be used as a texture.
/// In addition, the depth-format texture must not be MSAA.  If you must
/// texture from D24_S8 format or MSAA depth data, then you must call
/// \ref GX2ConvertDepthBufferToTextureSurface instead.
///
/// This function modifies both the depth buffer and its HiZ buffer.
/// Subsequent draw calls to this buffer will undo the expand, so this must be
/// called between drawing to the buffer and texturing from it.  It is fine to
/// draw to this buffer after expanding it.
///
/// All slices referred to by buffer->viewFirstSlice and
/// buffer->viewNumSlices will be expanded.  This function resolves only the single
/// miplevel specified by buffer->viewMip.
///
/// \note This API changes rendering states and disables state shadowing.
///       It may alter registers that cannot be restored by common GX2 functions.
///       Therefore you should always call \ref GX2SetContextState() afterward.
///
/// \param buffer Pointer to a HiZ depth buffer structure
///
/// \donotcall \gx2_typical \enddonotcall
///
/// \clobberstate
/// \disablesstateshadow
/// \notincompute
///
/// \writesgpu
/// \alwayswritesgpu
///
void GX2API GX2ExpandDepthBuffer(GX2DepthBuffer *buffer);

/// \brief Copies and converts a depth buffer to a format readable as a texture.
///
/// Copies a depth buffer (with or without HiZ) to another surface while
/// changing from depth-format tiling to texture/color-format tiling.
/// This is only necessary for depth formats that cannot already be read
/// by the texture unit (those with AA or D24_S8 format).  This is also
/// necessary if you wish to convert a depth buffer directly into a color
/// buffer.  The number of MSAA samples in the source and destination must
/// match.
///
/// The surface dstSurface must not have a use of GX2_SURFACE_USE_DEPTH_BUFFER
/// as this API will convert the surface tiling to only be suitable for uses
/// of GX2_SURFACE_USE_TEXTURE or GX2_SURFACE_USE_COLOR_BUFFER.
///
/// Converting 'in-place' can be achieved if the source and destination surfaces
/// have the same memory pointers.  The 'use' field in the source and
/// destination surfaces must be set differently and correctly (USE_DEPTH_BUFFER
/// for the source and !USE_DEPTH_BUFFER and [USE_TEXTURE or USE_COLOR_BUFFER]
/// for the destination).  When copying 'in-place', the 'tileMode' must be
/// the same for the source and destination.
///
/// If the HiZ buffer is present, the depth data will be expanded during the
/// conversion. When the conversion is not 'in-place', the source depth
/// and HiZ buffers will not be modified and it is fine to draw to the source
/// buffer after this operation.
///
/// If srcBuffer contains multiple slices, they will all be expanded to
/// the dstSurface beginning at dstSlice.  This function resolves only the single
/// miplevel specified by srcBuffer->viewMip and dstMip. This function resolves
/// the number of slices specified by srcBuffer->viewNumSlices starting with slice
/// number srcBuffer->viewFirstSlice.
///
/// The result of calling GX2ConvertDepthBufferToTextureSurface() on a
/// D_D24_S8_UNORM depth buffer is a D24_S8 buffer, with both depth and stencil
/// bits, that can be read by the texture unit.  (It is NOT necessary to call
/// GX2ConvertDepthBufferToTextureSurface() twice on the D_D24_S8_UNORM to get both
/// the depth and stencil data.) However, because the D24 depth data is 24-bits in
/// UNORM format and then S8 stencil data is 8-bits in UINT format, a single
/// texture sampler can only read one or the other (depth OR stencil data).  The
/// GX2_SURFACE_FORMAT_T_R24_UNORM_X8 and GX2_SURFACE_FORMAT_T_X24_G8_UINT values
/// are used to indicate the two formats used for reading the buffer, but the
/// buffer always contains both the depth and stencil data.
///
/// The render2depth demo shows how to read the depth and stencil data from the
/// buffer, but does so in two different draw calls.  By using the same GX2Surface,
/// pointing to the same memory buffer, setting the format field to either
/// T_R24_UNORM_X8 or T_X24_G8_UINT simply selects in which format the bits will be
/// read out of the buffer.  The GX2Texture structure's "compSel" field is used to
/// read the depth data out of the X channel (GX2_COMP_SEL_XXXX) or the stencil
/// data out of the Y channel (GX2_COMP_SEL_YYYY). It is also possible to read the
/// depth and stencil data from the memory buffer in a single draw call as long as
/// you setup two GX2Surface structures, two different samplers, "bind" the
/// converted depth buffer to both, and perform two texture fetches.
///
/// If converting a GX2_SURFACE_FORMAT_D_D24_S8_UNORM buffer using
/// GX2ConvertDepthBufferToTextureSurface(), set the destination format to
/// GX2_SURFACE_FORMAT_T_R24_UNORM_X8.  If converting a
/// GX2_SURFACE_FORMAT_D_D32_FLOAT_S8_UINT_X24 buffer using
/// GX2ConvertDepthBufferToTextureSurface(), set the destination format to
/// GX2_SURFACE_FORMAT_T_R32_FLOAT_X8_X24.
///
/// \note This API changes rendering states and disables state shadowing.
///       It may alter registers that cannot be restored by common GX2 functions.
///       Therefore you should always call \ref GX2SetContextState() afterward.
///
/// \param srcBuffer  Pointer to a depth buffer structure
/// \param dstSurface Pointer to a destination surface structure
/// \param dstMip     Mip level of destination surface to write
/// \param dstSlice   Slice to begin writing source slices to
///
/// \donotcall \gx2_typical \enddonotcall
///
/// \clobberstate
/// \disablesstateshadow
/// \notincompute
///
/// \writesgpu
/// \alwayswritesgpu
///
void GX2API GX2ConvertDepthBufferToTextureSurface(const GX2DepthBuffer *srcBuffer,
                                                    GX2Surface *dstSurface,
                                                    u32 dstMip, u32 dstSlice);

/// @}
/// @addtogroup GX2SurfaceColorGroup
/// @{

/// \brief Given an NV12 format surface, create a surface structure that refers
/// to the UV plane of the NV12 surface.
///
/// \donotcall \threadsafe \devonly \enddonotcall
///
GX2_INLINE void GX2InitNV12UVSurface(GX2Surface *dstUVSurface, GX2Surface *srcNV12Surface)
{
    ASSERT(srcNV12Surface && dstUVSurface);
    ASSERT(srcNV12Surface->format == GX2_SURFACE_FORMAT_T_NV12_UNORM);
    *dstUVSurface = *srcNV12Surface;
    dstUVSurface->height >>= 1;
    dstUVSurface->width >>= 1;
    dstUVSurface->pitch >>= 1;
    dstUVSurface->format = GX2_SURFACE_FORMAT_TC_R8_G8_UNORM;
    dstUVSurface->imagePtr = (void*)((u32)dstUVSurface->imagePtr + srcNV12Surface->mipOffset[0]);
    dstUVSurface->imageSize -= srcNV12Surface->mipOffset[0];
}

/// @}
/// @addtogroup GX2SurfaceAllGroup
/// @{

/// \brief Returns the size in bits per pixel for a given surface format.
///        For block compressed formats, it returns the "effective" bits per pixel (bits per block/pixels per block).
///
/// \donotcall \threadsafe \devonly \enddonotcall
///
u32 GX2API GX2GetSurfaceFormatBits(GX2SurfaceFormat format);

/// \brief Given a surface pointer and mip level, returns the swizzle offset.
///        If a surface is not compatible with swizzling, then 0 will be returned, even if
///        surface->swizzle is non-zero.
///
/// \param  surface Ptr to surface structure.
/// \param  mipLevel Mip level referenced.
/// \return The Swizzle offset.
///
/// \donotcall \threadsafe \devonly \enddonotcall
///
u32 GX2API GX2GetSurfaceSwizzleOffset(GX2Surface *surface, u32 mipLevel);

/// \brief Given a surface pointer, returns the swizzle that was set for that surface through
///        GX2SetSurfaceSwizzle().  If a non-zero swizzle was set through GX2SetSurfaceSwizzle(),
///        then GX2GetSurfaceSwizzle() will return the same non-zero swizzle even if the surface
///        is not compatible with swizzling.
///
/// \param  surface Ptr to surface structure.
/// \return The Swizzle value.
///
/// \donotcall \threadsafe \devonly \enddonotcall
///
u32 GX2API GX2GetSurfaceSwizzle(GX2Surface *surface);

/// \brief Helper function to set the swizzle value on a given surface.
///
/// \note Changing the swizzle value will cause all of the current contents of the buffer to appear corrupted if read.
///
/// \param  surface Ptr to surface structure.
/// \param  swizzle Desired swizzle value.
///
/// \donotcall \threadsafe \devonly \enddonotcall
///
void GX2API GX2SetSurfaceSwizzle(GX2Surface *surface, u32 swizzle);

/// \brief Given a surface pointer and mip level, returns the mip pitch in pixels.
///
/// \note For compressed formats, the pitch is in "elements" (4x4 pixel blocks).
///
/// \param  surface Ptr to surface structure.
/// \param  mipLevel Mip level referenced.
/// \return The mip pitch in pixels or elements.
///
/// \donotcall \threadsafe \devonly \enddonotcall
///
u32 GX2API GX2GetSurfaceMipPitch(GX2Surface *surface, u32 mipLevel);

/// \brief Given a surface pointer and mip level, returns the slice size in bytes.
///
/// Returns (aligned_width * aligned_height * bytes_per_pixel * samples).
/// The "aligned width" is equivalent to "pitch".
///
/// \note A "slice" here is always a 2D slice.
///
/// \param  surface Ptr to surface structure.
/// \param  mipLevel Mip level referenced.
/// \return The slice size in bytes.
///
/// \donotcall \threadsafe \devonly \enddonotcall
///
u32 GX2API GX2GetSurfaceMipSliceSize(GX2Surface *surface, u32 mipLevel);

/// \brief Given a surface pointer and mip level, return the number of depth slices at that mip level.
///
/// \param  surface Ptr to surface structure.
/// \param  mipLevel Mip level referenced, where 0 is the first mip level.
/// \return The number of max valid depth slices at that mip level.  1 is the smallest returned value.
///
/// \donotcall \threadsafe \devonly \enddonotcall
///
GX2_INLINE u32 GX2GetSurfaceMipDepth(const GX2Surface *surface, u32 mipLevel)
{
    ASSERT(surface);
    ASSERT(mipLevel < surface->numMips);
    if(surface->dim != GX2_SURFACE_DIM_3D)
    {
        return surface->depth;
    }
    else
    {
        //For 3D surfaces, the number of depth slices decreases with miplevel.
        u32 depth = surface->depth >> mipLevel;
        //Returned depth should never be smaller than 1.
        return (depth >= 1) ? depth : 1;
    }
}

/// \brief Given a surface format, return GX2_TRUE if the format is a block compressed format (i.e. BC1).
///
/// \param  format A surface format
/// \return GX2_TRUE if the format is a block compressed format and GX2_FALSE otherwise.
///
/// \donotcall \threadsafe \devonly \enddonotcall
///
GX2Boolean GX2API GX2SurfaceIsCompressed(GX2SurfaceFormat format);


/// \brief Given a surface format and use, return GX2_TRUE if the format is compatible with the use.
///
/// \param  use A surface use
/// \param  format A surface format
/// \return GX2_TRUE if the format is compatible with the use and GX2_FALSE otherwise.
/// \note "D" and "S" uses may not always be reported correctly.
///
/// \donotcall \threadsafe \devonly \enddonotcall
///
GX2Boolean GX2API GX2CheckSurfaceUseVsFormat(GX2SurfaceUse use, GX2SurfaceFormat format);

/// \brief Sets the AA mode.
///
/// This function sets the AA mode and can be used in conjunction
/// with \ref GX2SetDepthBuffer() to setup depth only rendering.
///
/// \note The AA mode is also set by \ref GX2SetColorBuffer() when the target
///       is GX2_RENDER_TARGET_0 or by \ref GX2UTSetRenderTargets().
///
/// \param aa AA Mode to set \ref GX2AAMode.
///
/// \donotcall \gx2_typical \enddonotcall
///
/// \writesgpu
/// \alwayswritesgpu
///
void GX2API GX2SetAAMode(GX2AAMode aa);

/// \brief Sets the AA mode with custom AA location.
///
/// This function sets the AA mode and AA position and can be used in
/// conjunction with \ref GX2SetDepthBuffer() to setup depth only rendering.
///
/// \note All entries should be populated when MSAA is in use. This API
///       automatically fills all entries by repeating user specified sample
///       positions.(first two in GX2_AA_MODE_2X and four in GX2_AA_MODE_4X).
/// \note The AA mode is also set by \ref GX2SetColorBuffer() when the target
///       is GX2_RENDER_TARGET_0 or by \ref GX2UTSetRenderTargets().
///       This API must be called afterward to customize the AA locations.
///
/// \param sampleLoc AA location (up to x8 samples). Each sample ranges -8/16 to 7/16 offset from pixel center.
/// \param aa AA Mode to set \ref GX2AAMode.
///
/// \donotcall \gx2_typical \enddonotcall
///
/// \writesgpu
/// \alwayswritesgpu
///
void GX2API GX2SetAAModeEx(GX2AASampleLoc* sampleLoc, GX2AAMode aa);

/// @}

/// @}

#ifdef __cplusplus
}
#endif

#endif // _CAFE_GX2_SURFACE_H_