gpu_py_texture.cc

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/* SPDX-FileCopyrightText: 2023 Blender Authors
 *
 * SPDX-License-Identifier: GPL-2.0-or-later */

 
#include <Python.h>
 
#include "BLI_math_base.h"
#include "BLI_string.h"
 
#include "DNA_image_types.h"
 
#include "GPU_context.hh"
#include "GPU_texture.hh"
 
#include "BKE_image.hh"
 
#include "../generic/py_capi_utils.hh"
#include "../generic/python_compat.hh" /* IWYU pragma: keep. */
 
#include "gpu_py.hh"
#include "gpu_py_buffer.hh"
 
#include "gpu_py_texture.hh" /* own include */
 
/* -------------------------------------------------------------------- */
 
const PyC_StringEnumItems pygpu_textureformat_items[] = {
    {GPU_RGBA8UI, "RGBA8UI"},
    {GPU_RGBA8I, "RGBA8I"},
    {GPU_RGBA8, "RGBA8"},
    {GPU_RGBA32UI, "RGBA32UI"},
    {GPU_RGBA32I, "RGBA32I"},
    {GPU_RGBA32F, "RGBA32F"},
    {GPU_RGBA16UI, "RGBA16UI"},
    {GPU_RGBA16I, "RGBA16I"},
    {GPU_RGBA16F, "RGBA16F"},
    {GPU_RGBA16, "RGBA16"},
    {GPU_RG8UI, "RG8UI"},
    {GPU_RG8I, "RG8I"},
    {GPU_RG8, "RG8"},
    {GPU_RG32UI, "RG32UI"},
    {GPU_RG32I, "RG32I"},
    {GPU_RG32F, "RG32F"},
    {GPU_RG16UI, "RG16UI"},
    {GPU_RG16I, "RG16I"},
    {GPU_RG16F, "RG16F"},
    {GPU_RG16, "RG16"},
    {GPU_R8UI, "R8UI"},
    {GPU_R8I, "R8I"},
    {GPU_R8, "R8"},
    {GPU_R32UI, "R32UI"},
    {GPU_R32I, "R32I"},
    {GPU_R32F, "R32F"},
    {GPU_R16UI, "R16UI"},
    {GPU_R16I, "R16I"},
    {GPU_R16F, "R16F"},
    {GPU_R16, "R16"},
    {GPU_R11F_G11F_B10F, "R11F_G11F_B10F"},
    {GPU_DEPTH32F_STENCIL8, "DEPTH32F_STENCIL8"},
    {GPU_DEPTH24_STENCIL8, "DEPTH24_STENCIL8"},
    {GPU_SRGB8_A8, "SRGB8_A8"},
    {GPU_RGB16F, "RGB16F"},
    {GPU_SRGB8_A8_DXT1, "SRGB8_A8_DXT1"},
    {GPU_SRGB8_A8_DXT3, "SRGB8_A8_DXT3"},
    {GPU_SRGB8_A8_DXT5, "SRGB8_A8_DXT5"},
    {GPU_RGBA8_DXT1, "RGBA8_DXT1"},
    {GPU_RGBA8_DXT3, "RGBA8_DXT3"},
    {GPU_RGBA8_DXT5, "RGBA8_DXT5"},
    {GPU_DEPTH_COMPONENT32F, "DEPTH_COMPONENT32F"},
    {GPU_DEPTH_COMPONENT24, "DEPTH_COMPONENT24"},
    {GPU_DEPTH_COMPONENT16, "DEPTH_COMPONENT16"},
    {0, nullptr},
};
 
static int pygpu_texture_valid_check(BPyGPUTexture *bpygpu_tex)
{
  if (UNLIKELY(bpygpu_tex->tex == nullptr)) {
    PyErr_SetString(PyExc_ReferenceError,
#ifdef BPYGPU_USE_GPUOBJ_FREE_METHOD
                    "GPU texture was freed, no further access is valid"
#else
                    "GPU texture: internal error"
#endif
    );
 
    return -1;
  }
  return 0;
}
 
#define BPYGPU_TEXTURE_CHECK_OBJ(bpygpu) \
  { \
    if (UNLIKELY(pygpu_texture_valid_check(bpygpu) == -1)) { \
      return nullptr; \
    } \
  } \
  ((void)0)

 
/* -------------------------------------------------------------------- */
 
static PyObject *pygpu_texture__tp_new(PyTypeObject * /*self*/, PyObject *args, PyObject *kwds)
{
  BPYGPU_IS_INIT_OR_ERROR_OBJ;
 
  PyObject *py_size;
  int size[3] = {1, 1, 1};
  int layers = 0;
  int is_cubemap = false;
  PyC_StringEnum pygpu_textureformat = {pygpu_textureformat_items, GPU_RGBA8};
  BPyGPUBuffer *pybuffer_obj = nullptr;
  char err_out[256] = "unknown error. See console";
 
  static const char *_keywords[] = {"size", "layers", "is_cubemap", "format", "data", nullptr};
  static _PyArg_Parser _parser = {
      PY_ARG_PARSER_HEAD_COMPAT()
      "O"  /* `size` */
      "|$" /* Optional keyword only arguments. */
      "i"  /* `layers` */
      "p"  /* `is_cubemap` */
      "O&" /* `format` */
      "O!" /* `data` */
      ":GPUTexture.__new__",
      _keywords,
      nullptr,
  };
  if (!_PyArg_ParseTupleAndKeywordsFast(args,
                                        kwds,
                                        &_parser,
                                        &py_size,
                                        &layers,
                                        &is_cubemap,
                                        PyC_ParseStringEnum,
                                        &pygpu_textureformat,
                                        &BPyGPU_BufferType,
                                        &pybuffer_obj))
  {
    return nullptr;
  }
 
  int len = 1;
  if (PySequence_Check(py_size)) {
    len = PySequence_Size(py_size);
    if ((len < 1) || (len > 3)) {
      PyErr_Format(PyExc_ValueError,
                   "GPUTexture.__new__: \"size\" must be between 1 and 3 in length (got %d)",
                   len);
      return nullptr;
    }
    if (PyC_AsArray(size, sizeof(*size), py_size, len, &PyLong_Type, "GPUTexture.__new__") == -1) {
      return nullptr;
    }
  }
  else if (PyLong_Check(py_size)) {
    size[0] = PyLong_AsLong(py_size);
  }
  else {
    PyErr_SetString(PyExc_ValueError, "GPUTexture.__new__: Expected an int or tuple as first arg");
    return nullptr;
  }
 
  void *data = nullptr;
  if (pybuffer_obj) {
    if (pybuffer_obj->format != GPU_DATA_FLOAT) {
      PyErr_SetString(PyExc_ValueError,
                      "GPUTexture.__new__: Only Buffer of format `FLOAT` is currently supported");
      return nullptr;
    }
 
    int component_len = GPU_texture_component_len(
        eGPUTextureFormat(pygpu_textureformat.value_found));
    int component_size_expected = sizeof(float);
    size_t data_space_expected = size_t(size[0]) * size[1] * size[2] * max_ii(1, layers) *
                                 component_len * component_size_expected;
    if (is_cubemap) {
      data_space_expected *= 6 * size[0];
    }
 
    if (bpygpu_Buffer_size(pybuffer_obj) < data_space_expected) {
      PyErr_SetString(PyExc_ValueError, "GPUTexture.__new__: Buffer size smaller than requested");
      return nullptr;
    }
    data = pybuffer_obj->buf.as_void;
  }
 
  GPUTexture *tex = nullptr;
  if (is_cubemap && len != 1) {
    STRNCPY(err_out,
            "In cubemaps the same dimension represents height, width and depth. No tuple needed");
  }
  else if (size[0] < 1 || size[1] < 1 || size[2] < 1) {
    STRNCPY(err_out, "Values less than 1 are not allowed in dimensions");
  }
  else if (layers && len == 3) {
    STRNCPY(err_out, "3D textures have no layers");
  }
  else if (!GPU_context_active_get()) {
    STRNCPY(err_out, "No active GPU context found");
  }
  else {
    const char *name = "python_texture";
    eGPUTextureUsage usage = GPU_TEXTURE_USAGE_GENERAL;
    if (is_cubemap) {
      if (layers) {
        tex = GPU_texture_create_cube_array(name,
                                            size[0],
                                            layers,
                                            1,
                                            eGPUTextureFormat(pygpu_textureformat.value_found),
                                            usage,
                                            static_cast<const float *>(data));
      }
      else {
        tex = GPU_texture_create_cube(name,
                                      size[0],
                                      1,
                                      eGPUTextureFormat(pygpu_textureformat.value_found),
                                      usage,
                                      static_cast<const float *>(data));
      }
    }
    else if (layers) {
      if (len == 2) {
        tex = GPU_texture_create_2d_array(name,
                                          size[0],
                                          size[1],
                                          layers,
                                          1,
                                          eGPUTextureFormat(pygpu_textureformat.value_found),
                                          usage,
                                          static_cast<const float *>(data));
      }
      else {
        tex = GPU_texture_create_1d_array(name,
                                          size[0],
                                          layers,
                                          1,
                                          eGPUTextureFormat(pygpu_textureformat.value_found),
                                          usage,
                                          static_cast<const float *>(data));
      }
    }
    else if (len == 3) {
      tex = GPU_texture_create_3d(name,
                                  size[0],
                                  size[1],
                                  size[2],
                                  1,
                                  eGPUTextureFormat(pygpu_textureformat.value_found),
                                  usage,
                                  data);
    }
    else if (len == 2) {
      tex = GPU_texture_create_2d(name,
                                  size[0],
                                  size[1],
                                  1,
                                  eGPUTextureFormat(pygpu_textureformat.value_found),
                                  usage,
                                  static_cast<const float *>(data));
    }
    else {
      tex = GPU_texture_create_1d(name,
                                  size[0],
                                  1,
                                  eGPUTextureFormat(pygpu_textureformat.value_found),
                                  usage,
                                  static_cast<const float *>(data));
    }
  }
 
  if (tex == nullptr) {
    PyErr_Format(PyExc_RuntimeError, "gpu.texture.new(...) failed with '%s'", err_out);
    return nullptr;
  }
 
  return BPyGPUTexture_CreatePyObject(tex, false);
}
 
PyDoc_STRVAR(
    /* Wrap. */
    pygpu_texture_width_doc,
    "Width of the texture.\n"
    "\n"
    ":type: int");
static PyObject *pygpu_texture_width_get(BPyGPUTexture *self, void * /*type*/)
{
  BPYGPU_TEXTURE_CHECK_OBJ(self);
  return PyLong_FromLong(GPU_texture_width(self->tex));
}
 
PyDoc_STRVAR(
    /* Wrap. */
    pygpu_texture_height_doc,
    "Height of the texture.\n"
    "\n"
    ":type: int");
static PyObject *pygpu_texture_height_get(BPyGPUTexture *self, void * /*type*/)
{
  BPYGPU_TEXTURE_CHECK_OBJ(self);
  return PyLong_FromLong(GPU_texture_height(self->tex));
}
 
PyDoc_STRVAR(
    /* Wrap. */
    pygpu_texture_format_doc,
    "Format of the texture.\n"
    "\n"
    ":type: str");
static PyObject *pygpu_texture_format_get(BPyGPUTexture *self, void * /*type*/)
{
  BPYGPU_TEXTURE_CHECK_OBJ(self);
  eGPUTextureFormat format = GPU_texture_format(self->tex);
  return PyUnicode_FromString(PyC_StringEnum_FindIDFromValue(pygpu_textureformat_items, format));
}
 
PyDoc_STRVAR(
    /* Wrap. */
    pygpu_texture_clear_doc,
    ".. method:: clear(format='FLOAT', value=(0.0, 0.0, 0.0, 1.0))\n"
    "\n"
    "   Fill texture with specific value.\n"
    "\n"
    "   :arg format: The format that describes the content of a single item.\n"
    "      Possible values are `FLOAT`, `INT`, `UINT`, `UBYTE`, `UINT_24_8` and `10_11_11_REV`.\n"
    "   :type format: str\n"
    "   :arg value: Sequence each representing the value to fill. Sizes 1..4 are supported.\n"
    "   :type value: Sequence[float]\n");
static PyObject *pygpu_texture_clear(BPyGPUTexture *self, PyObject *args, PyObject *kwds)
{
  BPYGPU_TEXTURE_CHECK_OBJ(self);
  PyC_StringEnum pygpu_dataformat = {bpygpu_dataformat_items};
  union {
    int i[4];
    float f[4];
    char c[4];
  } values;
 
  PyObject *py_values;
 
  static const char *_keywords[] = {"format", "value", nullptr};
  static _PyArg_Parser _parser = {
      PY_ARG_PARSER_HEAD_COMPAT()
      "$"  /* Keyword only arguments. */
      "O&" /* `format` */
      "O"  /* `value` */
      ":clear",
      _keywords,
      nullptr,
  };
  if (!_PyArg_ParseTupleAndKeywordsFast(
          args, kwds, &_parser, PyC_ParseStringEnum, &pygpu_dataformat, &py_values))
  {
    return nullptr;
  }
 
  int shape = PySequence_Size(py_values);
  if (shape == -1) {
    return nullptr;
  }
 
  if (shape > 4) {
    PyErr_SetString(PyExc_AttributeError, "too many dimensions, max is 4");
    return nullptr;
  }
 
  if (shape != 1 && ELEM(pygpu_dataformat.value_found, GPU_DATA_UINT_24_8, GPU_DATA_10_11_11_REV))
  {
    PyErr_SetString(PyExc_AttributeError,
                    "`UINT_24_8` and `10_11_11_REV` only support single values");
    return nullptr;
  }
 
  memset(&values, 0, sizeof(values));
  if (PyC_AsArray(&values,
                  (pygpu_dataformat.value_found == GPU_DATA_FLOAT) ? sizeof(*values.f) :
                                                                     sizeof(*values.i),
                  py_values,
                  shape,
                  (pygpu_dataformat.value_found == GPU_DATA_FLOAT) ? &PyFloat_Type : &PyLong_Type,
                  "clear") == -1)
  {
    return nullptr;
  }
 
  if (pygpu_dataformat.value_found == GPU_DATA_UBYTE) {
    /* Convert to byte. */
    values.c[0] = values.i[0];
    values.c[1] = values.i[1];
    values.c[2] = values.i[2];
    values.c[3] = values.i[3];
  }
 
  GPU_texture_clear(self->tex, eGPUDataFormat(pygpu_dataformat.value_found), &values);
  Py_RETURN_NONE;
}
 
PyDoc_STRVAR(
    /* Wrap. */
    pygpu_texture_read_doc,
    ".. method:: read()\n"
    "\n"
    "   Creates a buffer with the value of all pixels.\n"
    "\n");
static PyObject *pygpu_texture_read(BPyGPUTexture *self)
{
  BPYGPU_TEXTURE_CHECK_OBJ(self);
  eGPUTextureFormat tex_format = GPU_texture_format(self->tex);
 
  /* #GPU_texture_read is restricted in combining 'data_format' with 'tex_format'.
   * So choose data_format here. */
  eGPUDataFormat best_data_format;
  switch (tex_format) {
    case GPU_DEPTH_COMPONENT24:
    case GPU_DEPTH_COMPONENT16:
    case GPU_DEPTH_COMPONENT32F:
      best_data_format = GPU_DATA_FLOAT;
      break;
    case GPU_DEPTH24_STENCIL8:
    case GPU_DEPTH32F_STENCIL8:
      best_data_format = GPU_DATA_UINT_24_8;
      break;
    case GPU_R8UI:
    case GPU_R16UI:
    case GPU_RG16UI:
    case GPU_R32UI:
      best_data_format = GPU_DATA_UINT;
      break;
    case GPU_RG16I:
    case GPU_R16I:
      best_data_format = GPU_DATA_INT;
      break;
    case GPU_R8:
    case GPU_RG8:
    case GPU_RGBA8:
    case GPU_RGBA8UI:
    case GPU_SRGB8_A8:
      best_data_format = GPU_DATA_UBYTE;
      break;
    case GPU_R11F_G11F_B10F:
      best_data_format = GPU_DATA_10_11_11_REV;
      break;
    default:
      best_data_format = GPU_DATA_FLOAT;
      break;
  }
 
  void *buf = GPU_texture_read(self->tex, best_data_format, 0);
  const Py_ssize_t shape[3] = {GPU_texture_height(self->tex),
                               GPU_texture_width(self->tex),
                               Py_ssize_t(GPU_texture_component_len(tex_format))};
 
  int shape_len = (shape[2] == 1) ? 2 : 3;
  return (PyObject *)BPyGPU_Buffer_CreatePyObject(best_data_format, shape, shape_len, buf);
}
 
#ifdef BPYGPU_USE_GPUOBJ_FREE_METHOD
PyDoc_STRVAR(
    /* Wrap. */
    pygpu_texture_free_doc,
    ".. method:: free()\n"
    "\n"
    "   Free the texture object.\n"
    "   The texture object will no longer be accessible.\n");
static PyObject *pygpu_texture_free(BPyGPUTexture *self)
{
  BPYGPU_TEXTURE_CHECK_OBJ(self);
 
  GPU_texture_free(self->tex);
  self->tex = nullptr;
  Py_RETURN_NONE;
}
#endif
 
static void BPyGPUTexture__tp_dealloc(BPyGPUTexture *self)
{
  if (self->tex) {
#ifndef GPU_NO_USE_PY_REFERENCES
    GPU_texture_py_reference_set(self->tex, nullptr);
#endif
    GPU_texture_free(self->tex);
  }
  Py_TYPE(self)->tp_free((PyObject *)self);
}
 
static PyGetSetDef pygpu_texture__tp_getseters[] = {
    {"width", (getter)pygpu_texture_width_get, (setter) nullptr, pygpu_texture_width_doc, nullptr},
    {"height",
     (getter)pygpu_texture_height_get,
     (setter) nullptr,
     pygpu_texture_height_doc,
     nullptr},
    {"format",
     (getter)pygpu_texture_format_get,
     (setter) nullptr,
     pygpu_texture_format_doc,
     nullptr},
    {nullptr, nullptr, nullptr, nullptr, nullptr} /* Sentinel */
};
 
#ifdef __GNUC__
#  ifdef __clang__
#    pragma clang diagnostic push
#    pragma clang diagnostic ignored "-Wcast-function-type"
#  else
#    pragma GCC diagnostic push
#    pragma GCC diagnostic ignored "-Wcast-function-type"
#  endif
#endif
 
static PyMethodDef pygpu_texture__tp_methods[] = {
    {"clear",
     (PyCFunction)pygpu_texture_clear,
     METH_VARARGS | METH_KEYWORDS,
     pygpu_texture_clear_doc},
    {"read", (PyCFunction)pygpu_texture_read, METH_NOARGS, pygpu_texture_read_doc},
#ifdef BPYGPU_USE_GPUOBJ_FREE_METHOD
    {"free", (PyCFunction)pygpu_texture_free, METH_NOARGS, pygpu_texture_free_doc},
#endif
    {nullptr, nullptr, 0, nullptr},
};
 
#ifdef __GNUC__
#  ifdef __clang__
#    pragma clang diagnostic pop
#  else
#    pragma GCC diagnostic pop
#  endif
#endif
 
PyDoc_STRVAR(
    /* Wrap. */
    pygpu_texture__tp_doc,
    ".. class:: GPUTexture(size, layers=0, is_cubemap=False, format='RGBA8', data=None)\n"
    "\n"
    "   This object gives access to off GPU textures.\n"
    "\n"
    "   :arg size: Dimensions of the texture 1D, 2D, 3D or cubemap.\n"
    "   :type size: int | Sequence[int]\n"
    "   :arg layers: Number of layers in texture array or number of cubemaps in cubemap array\n"
    "   :type layers: int\n"
    "   :arg is_cubemap: Indicates the creation of a cubemap texture.\n"
    "   :type is_cubemap: int\n"
    "   :arg format: Internal data format inside GPU memory. Possible values are:\n"
    "      `RGBA8UI`,\n"
    "      `RGBA8I`,\n"
    "      `RGBA8`,\n"
    "      `RGBA32UI`,\n"
    "      `RGBA32I`,\n"
    "      `RGBA32F`,\n"
    "      `RGBA16UI`,\n"
    "      `RGBA16I`,\n"
    "      `RGBA16F`,\n"
    "      `RGBA16`,\n"
    "      `RG8UI`,\n"
    "      `RG8I`,\n"
    "      `RG8`,\n"
    "      `RG32UI`,\n"
    "      `RG32I`,\n"
    "      `RG32F`,\n"
    "      `RG16UI`,\n"
    "      `RG16I`,\n"
    "      `RG16F`,\n"
    "      `RG16`,\n"
    "      `R8UI`,\n"
    "      `R8I`,\n"
    "      `R8`,\n"
    "      `R32UI`,\n"
    "      `R32I`,\n"
    "      `R32F`,\n"
    "      `R16UI`,\n"
    "      `R16I`,\n"
    "      `R16F`,\n"
    "      `R16`,\n"
    "      `R11F_G11F_B10F`,\n"
    "      `DEPTH32F_STENCIL8`,\n"
    "      `DEPTH24_STENCIL8`,\n"
    "      `SRGB8_A8`,\n"
    "      `RGB16F`,\n"
    "      `SRGB8_A8_DXT1`,\n"
    "      `SRGB8_A8_DXT3`,\n"
    "      `SRGB8_A8_DXT5`,\n"
    "      `RGBA8_DXT1`,\n"
    "      `RGBA8_DXT3`,\n"
    "      `RGBA8_DXT5`,\n"
    "      `DEPTH_COMPONENT32F`,\n"
    "      `DEPTH_COMPONENT24`,\n"
    "      `DEPTH_COMPONENT16`,\n"
    "   :type format: str\n"
    "   :arg data: Buffer object to fill the texture.\n"
    "   :type data: :class:`gpu.types.Buffer`\n");
PyTypeObject BPyGPUTexture_Type = {
    /*ob_base*/ PyVarObject_HEAD_INIT(nullptr, 0)
    /*tp_name*/ "GPUTexture",
    /*tp_basicsize*/ sizeof(BPyGPUTexture),
    /*tp_itemsize*/ 0,
    /*tp_dealloc*/ (destructor)BPyGPUTexture__tp_dealloc,
    /*tp_vectorcall_offset*/ 0,
    /*tp_getattr*/ nullptr,
    /*tp_setattr*/ nullptr,
    /*tp_as_async*/ nullptr,
    /*tp_repr*/ nullptr,
    /*tp_as_number*/ nullptr,
    /*tp_as_sequence*/ nullptr,
    /*tp_as_mapping*/ nullptr,
    /*tp_hash*/ nullptr,
    /*tp_call*/ nullptr,
    /*tp_str*/ nullptr,
    /*tp_getattro*/ nullptr,
    /*tp_setattro*/ nullptr,
    /*tp_as_buffer*/ nullptr,
    /*tp_flags*/ Py_TPFLAGS_DEFAULT,
    /*tp_doc*/ pygpu_texture__tp_doc,
    /*tp_traverse*/ nullptr,
    /*tp_clear*/ nullptr,
    /*tp_richcompare*/ nullptr,
    /*tp_weaklistoffset*/ 0,
    /*tp_iter*/ nullptr,
    /*tp_iternext*/ nullptr,
    /*tp_methods*/ pygpu_texture__tp_methods,
    /*tp_members*/ nullptr,
    /*tp_getset*/ pygpu_texture__tp_getseters,
    /*tp_base*/ nullptr,
    /*tp_dict*/ nullptr,
    /*tp_descr_get*/ nullptr,
    /*tp_descr_set*/ nullptr,
    /*tp_dictoffset*/ 0,
    /*tp_init*/ nullptr,
    /*tp_alloc*/ nullptr,
    /*tp_new*/ pygpu_texture__tp_new,
    /*tp_free*/ nullptr,
    /*tp_is_gc*/ nullptr,
    /*tp_bases*/ nullptr,
    /*tp_mro*/ nullptr,
    /*tp_cache*/ nullptr,
    /*tp_subclasses*/ nullptr,
    /*tp_weaklist*/ nullptr,
    /*tp_del*/ nullptr,
    /*tp_version_tag*/ 0,
    /*tp_finalize*/ nullptr,
    /*tp_vectorcall*/ nullptr,
};

 
/* -------------------------------------------------------------------- */
 
PyDoc_STRVAR(
    /* Wrap. */
    pygpu_texture_from_image_doc,
    ".. function:: from_image(image)\n"
    "\n"
    "   Get GPUTexture corresponding to an Image datablock. The GPUTexture memory is "
    "shared with Blender.\n"
    "   Note: Colors read from the texture will be in scene linear color space and have "
    "premultiplied or straight alpha matching the image alpha mode.\n"
    "\n"
    "   :arg image: The Image datablock.\n"
    "   :type image: :class:`bpy.types.Image`\n"
    "   :return: The GPUTexture used by the image.\n"
    "   :rtype: :class:`gpu.types.GPUTexture`\n");
static PyObject *pygpu_texture_from_image(PyObject * /*self*/, PyObject *arg)
{
  Image *ima = static_cast<Image *>(PyC_RNA_AsPointer(arg, "Image"));
  if (ima == nullptr) {
    return nullptr;
  }
 
  ImageUser iuser;
  BKE_imageuser_default(&iuser);
  GPUTexture *tex = BKE_image_get_gpu_texture(ima, &iuser);
 
  return BPyGPUTexture_CreatePyObject(tex, true);
}
 
static PyMethodDef pygpu_texture__m_methods[] = {
    {"from_image", (PyCFunction)pygpu_texture_from_image, METH_O, pygpu_texture_from_image_doc},
    {nullptr, nullptr, 0, nullptr},
};
 
PyDoc_STRVAR(
    /* Wrap. */
    pygpu_texture__m_doc,
    "This module provides utils for textures.");
static PyModuleDef pygpu_texture_module_def = {
    /*m_base*/ PyModuleDef_HEAD_INIT,
    /*m_name*/ "gpu.texture",
    /*m_doc*/ pygpu_texture__m_doc,
    /*m_size*/ 0,
    /*m_methods*/ pygpu_texture__m_methods,
    /*m_slots*/ nullptr,
    /*m_traverse*/ nullptr,
    /*m_clear*/ nullptr,
    /*m_free*/ nullptr,
};

 
/* -------------------------------------------------------------------- */
 
int bpygpu_ParseTexture(PyObject *o, void *p)
{
  if (o == Py_None) {
    *(GPUTexture **)p = nullptr;
    return 1;
  }
 
  if (!BPyGPUTexture_Check(o)) {
    PyErr_Format(
        PyExc_ValueError, "expected a texture or None object, got %s", Py_TYPE(o)->tp_name);
    return 0;
  }
 
  if (UNLIKELY(pygpu_texture_valid_check((BPyGPUTexture *)o) == -1)) {
    return 0;
  }
 
  *(GPUTexture **)p = ((BPyGPUTexture *)o)->tex;
  return 1;
}
 
PyObject *bpygpu_texture_init()
{
  PyObject *submodule;
  submodule = PyModule_Create(&pygpu_texture_module_def);
 
  return submodule;
}

 
/* -------------------------------------------------------------------- */
 
PyObject *BPyGPUTexture_CreatePyObject(GPUTexture *tex, bool shared_reference)
{
  BPyGPUTexture *self;
 
  if (shared_reference) {
#ifndef GPU_NO_USE_PY_REFERENCES
    void **ref = GPU_texture_py_reference_get(tex);
    if (ref) {
      /* Retrieve BPyGPUTexture reference. */
      self = (BPyGPUTexture *)POINTER_OFFSET(ref, -offsetof(BPyGPUTexture, tex));
      BLI_assert(self->tex == tex);
      Py_INCREF(self);
      return (PyObject *)self;
    }
#endif
 
    GPU_texture_ref(tex);
  }
 
  self = PyObject_New(BPyGPUTexture, &BPyGPUTexture_Type);
  self->tex = tex;
 
#ifndef GPU_NO_USE_PY_REFERENCES
  BLI_assert(GPU_texture_py_reference_get(tex) == nullptr);
  GPU_texture_py_reference_set(tex, (void **)&self->tex);
#endif
 
  return (PyObject *)self;
}

 
#undef BPYGPU_TEXTURE_CHECK_OBJ