hip_texture.h

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/*
Copyright (c) 2015-2016 Advanced Micro Devices, Inc. All rights reserved.

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furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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THE SOFTWARE.
*/

//#pragma once

#ifndef HIP_HCC_DETAIL_TEXTURE_H
#define HIP_HCC_DETAIL_TEXTURE_H

#include <limits.h>

//#include <hip/hcc_detail/hip_runtime.h>

//----
//Texture - TODO - likely need to move this to a separate file only included with kernel compilation.
#define hipTextureType1D 1

typedef enum {
  hipChannelFormatKindSigned = 0,
  hipChannelFormatKindUnsigned,
  hipChannelFormatKindFloat,
  hipChannelFormatKindNone

} hipChannelFormatKind;

typedef struct hipChannelFormatDesc {
  int x;
  int y;
  int z;
  int w;
  hipChannelFormatKind f;
} hipChannelFormatDesc;

typedef enum hipTextureReadMode
{
  hipReadModeElementType,  
} hipTextureReadMode;

typedef enum hipTextureFilterMode
{
    hipFilterModePoint,  
} hipTextureFilterMode;

struct textureReference {
    hipTextureFilterMode filterMode;
    bool                 normalized;
    hipChannelFormatDesc channelDesc;
};
#if __cplusplus
template <class T, int texType=hipTextureType1D, enum hipTextureReadMode=hipReadModeElementType>
struct texture : public textureReference {

    const T * _dataPtr;  // pointer to underlying data.

    //texture() : filterMode(hipFilterModePoint), normalized(false), _dataPtr(NULL) {};
    unsigned int width;
    unsigned int height;

};
#endif

typedef struct {
  unsigned int width;
  unsigned int height;
  hipChannelFormatKind f;
  void* data; //FIXME: generalize this
} hipArray;


#define tex1Dfetch(_tex, _addr) (_tex._dataPtr[_addr])

#define tex2D(_tex, _dx, _dy) \
  _tex._dataPtr[(unsigned int)_dx + (unsigned int)_dy*(_tex.width)]

hipError_t hipMallocArray(hipArray** array, const hipChannelFormatDesc* desc,
                          size_t width, size_t height = 0, unsigned int flags = 0);

hipError_t hipFreeArray(hipArray* array);

hipError_t hipMemcpy2D(void* dst, size_t dpitch, const void* src, size_t spitch, size_t width, size_t height, hipMemcpyKind kind);

hipError_t hipMemcpy2DToArray(hipArray* dst, size_t wOffset, size_t hOffset, const void* src,
                              size_t spitch, size_t width, size_t height, hipMemcpyKind kind);

hipError_t hipMemcpyToArray(hipArray* dst, size_t wOffset, size_t hOffset,
                            const void* src, size_t count, hipMemcpyKind kind);


// These are C++ APIs - maybe belong in separate file.
// C API:
#if 0
hipChannelFormatDesc  hipBindTexture(size_t *offset, struct textureReference *tex, const void *devPtr, const struct hipChannelFormatDesc *desc, size_t size=UINT_MAX)
{
    tex->_dataPtr = devPtr;
}
#endif

hipChannelFormatDesc hipCreateChannelDesc(int x, int y, int z, int w, hipChannelFormatKind f);

// descriptors
template <typename T> inline hipChannelFormatDesc hipCreateChannelDesc() {
  return hipCreateChannelDesc(0, 0, 0, 0, hipChannelFormatKindNone);
}
template <> inline hipChannelFormatDesc hipCreateChannelDesc<int>() {
  int e = (int)sizeof(int) * 8;
  return hipCreateChannelDesc(e, 0, 0, 0, hipChannelFormatKindSigned);
}
template <> inline hipChannelFormatDesc hipCreateChannelDesc<unsigned int>() {
  int e = (int)sizeof(unsigned int) * 8;
  return hipCreateChannelDesc(e, 0, 0, 0, hipChannelFormatKindUnsigned);
}
template <> inline hipChannelFormatDesc hipCreateChannelDesc<long>() {
  int e = (int)sizeof(long) * 8;
  return hipCreateChannelDesc(e, 0, 0, 0, hipChannelFormatKindSigned);
}
template <> inline hipChannelFormatDesc hipCreateChannelDesc<unsigned long>() {
  int e = (int)sizeof(unsigned long) * 8;
  return hipCreateChannelDesc(e, 0, 0, 0, hipChannelFormatKindUnsigned);
}
template <> inline hipChannelFormatDesc hipCreateChannelDesc<float>() {
  int e = (int)sizeof(float) * 8;
  return hipCreateChannelDesc(e, 0, 0, 0, hipChannelFormatKindFloat);
}

/*
 * @brief hipBindTexture Binds size bytes of the memory area pointed to by @p devPtr to the texture reference tex.
 *
 * @p desc describes how the memory is interpreted when fetching values from the texture. The @p offset parameter is an optional byte offset as with the low-level
 * hipBindTexture() function. Any memory previously bound to tex is unbound.
 *
 *  @param[in]  offset - Offset in bytes
 *  @param[out]  tex - texture to bind
 *  @param[in]  devPtr - Memory area on device
 *  @param[in]  desc - Channel format
 *  @param[in]  size - Size of the memory area pointed to by devPtr
 *  @return #hipSuccess, #hipErrorInvalidValue, #hipErrorMemoryFree, #hipErrorUnknown
 **/
template <class T, int dim, enum hipTextureReadMode readMode>
hipError_t  hipBindTexture(size_t *offset,
                                     struct texture<T, dim, readMode> &tex,
                                     const void *devPtr,
                                     const struct hipChannelFormatDesc *desc,
                                     size_t size=UINT_MAX)
{
    tex._dataPtr = static_cast<const T*>(devPtr);

    return hipSuccess;
}

/*
 * @brief hipBindTexture Binds size bytes of the memory area pointed to by @p devPtr to the texture reference tex.
 *
 * @p desc describes how the memory is interpreted when fetching values from the texture. The @p offset parameter is an optional byte offset as with the low-level
 * hipBindTexture() function. Any memory previously bound to tex is unbound.
 *
 *  @param[in]  offset - Offset in bytes
 *  @param[in]  tex - texture to bind
 *  @param[in]  devPtr - Memory area on device
 *  @param[in]  size - Size of the memory area pointed to by devPtr
 *  @return #hipSuccess, #hipErrorInvalidValue, #hipErrorMemoryFree, #hipErrorUnknown
 **/
template <class T, int dim, enum hipTextureReadMode readMode>
hipError_t  hipBindTexture(size_t *offset,
                                     struct texture<T, dim, readMode> &tex,
                                     const void *devPtr,
                                     size_t size=UINT_MAX)
{
    return  hipBindTexture(offset, tex, devPtr, &tex.channelDesc, size);
}

template <class T, int dim, enum hipTextureReadMode readMode>
hipError_t hipBindTextureToArray(struct texture<T, dim, readMode> &tex, hipArray* array) {
  tex.width = array->width;
  tex.height = array->height;
  tex._dataPtr = static_cast<const T*>(array->data);
  return hipSuccess;
}

/*
 * @brief Unbinds the textuer bound to @p tex
 *
 *  @param[in]  tex - texture to unbind
 *
 *  @return #hipSuccess
 **/
template <class T, int dim, enum hipTextureReadMode readMode>
hipError_t  hipUnbindTexture(struct texture<T, dim, readMode> &tex)
{
    tex._dataPtr = NULL;

    return hipSuccess;
}



// doxygen end Texture
// End doxygen API:
#endif