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/* This file is part of Korman.
*
* Korman is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* Korman is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with Korman. If not, see <http://www.gnu.org/licenses/>.
*/
#include "texture.h"
#ifdef _WIN32
# define WIN32_LEAN_AND_MEAN
# define NOMINMAX
# include <windows.h>
#endif // _WIN32
#include <cmath>
#include <GL/gl.h>
#include <PRP/Surface/plMipmap.h>
#ifndef GL_GENERATE_MIPMAP
# define GL_GENERATE_MIPMAP 0x8191
#endif // GL_GENERATE_MIPMAP
#define TEXTARGET_TEXTURE_2D 0
static inline bool _get_float(PyObject* source, const char* attr, float& result) {
PyObjectRef pyfloat = PyObject_GetAttrString(source, attr);
if (pyfloat) {
result = (float)PyFloat_AsDouble(pyfloat);
return PyErr_Occurred() == NULL;
}
return false;
}
extern "C" {
enum {
TEX_DETAIL_ALPHA = 0,
TEX_DETAIL_ADD = 1,
TEX_DETAIL_MULTIPLY = 2,
};
typedef struct {
PyObject_HEAD
PyObject* m_blenderImage;
PyObject* m_textureKey;
bool m_ownIt;
GLint m_prevImage;
bool m_changedState;
GLint m_mipmapState;
} pyGLTexture;
typedef struct {
PyObject_HEAD
plMipmap* fThis;
bool fPyOwned;
} pyMipmap;
static void pyGLTexture_dealloc(pyGLTexture* self) {
Py_XDECREF(self->m_textureKey);
Py_XDECREF(self->m_blenderImage);
Py_TYPE(self)->tp_free((PyObject*)self);
}
static PyObject* pyGLTexture_new(PyTypeObject* type, PyObject* args, PyObject* kwds) {
pyGLTexture* self = (pyGLTexture*)type->tp_alloc(type, 0);
self->m_blenderImage = NULL;
self->m_textureKey = NULL;
self->m_ownIt = false;
self->m_prevImage = 0;
self->m_changedState = false;
self->m_mipmapState = 0;
return (PyObject*)self;
}
static int pyGLTexture___init__(pyGLTexture* self, PyObject* args, PyObject* kwds) {
if (!PyArg_ParseTuple(args, "O", &self->m_textureKey)) {
PyErr_SetString(PyExc_TypeError, "expected a korman.exporter.material._Texture");
return -1;
}
self->m_blenderImage = PyObject_GetAttrString(self->m_textureKey, "image");
if (!self->m_blenderImage) {
PyErr_SetString(PyExc_RuntimeError, "Could not fetch Blender Image");
return -1;
}
Py_INCREF(self->m_textureKey);
// Done!
return 0;
}
static PyObject* pyGLTexture__enter__(pyGLTexture* self) {
// Is the image already loaded?
PyObjectRef bindcode = PyObject_GetAttrString(self->m_blenderImage, "bindcode");
// bindcode changed to a sequence in 2.77. We want the first element for a 2D texture.
// Why did we make this change, exactly?
if (PySequence_Check(bindcode)) {
bindcode = PySequence_GetItem(bindcode, TEXTARGET_TEXTURE_2D);
}
// Now we should have a GLuint...
if (!PyLong_Check(bindcode)) {
PyErr_SetString(PyExc_TypeError, "Image bindcode isn't a long?");
return NULL;
}
glGetIntegerv(GL_TEXTURE_BINDING_2D, &self->m_prevImage);
GLuint image_bindcode = PyLong_AsUnsignedLong(bindcode);
self->m_ownIt = image_bindcode == 0;
// Load image into GL
if (self->m_ownIt) {
PyObjectRef new_bind = PyObject_CallMethod(self->m_blenderImage, "gl_load", NULL);
if (!PyLong_Check(new_bind)) {
PyErr_SetString(PyExc_TypeError, "gl_load() did not return a long");
return NULL;
}
ssize_t result = PyLong_AsSize_t(new_bind);
if (result != GL_NO_ERROR) {
PyErr_Format(PyExc_RuntimeError, "gl_load() error: %d", result);
return NULL;
}
bindcode = PyObject_GetAttrString(self->m_blenderImage, "bindcode");
if (PySequence_Check(bindcode)) {
bindcode = PySequence_GetItem(bindcode, TEXTARGET_TEXTURE_2D);
}
// Now we should have a GLuint...
if (!PyLong_Check(bindcode)) {
PyErr_SetString(PyExc_TypeError, "Image bindcode isn't a long?");
return NULL;
}
image_bindcode = PyLong_AsUnsignedLong(bindcode);
}
// Set image as current in GL
if (self->m_prevImage != image_bindcode) {
self->m_changedState = true;
glBindTexture(GL_TEXTURE_2D, image_bindcode);
}
// Misc GL state
glGetTexParameteriv(GL_TEXTURE_2D, GL_GENERATE_MIPMAP, &self->m_mipmapState);
Py_INCREF(self);
return (PyObject*)self;
}
static PyObject* pyGLTexture__exit__(pyGLTexture* self, PyObject*) {
// We don't care about the args here
glTexParameteri(GL_TEXTURE_2D, GL_GENERATE_MIPMAP, self->m_mipmapState);
if (self->m_changedState)
glBindTexture(GL_TEXTURE_2D, self->m_prevImage);
Py_RETURN_NONE;
}
static PyObject* pyGLTexture_generate_mipmap(pyGLTexture* self) {
glTexParameteri(GL_TEXTURE_2D, GL_GENERATE_MIPMAP, 1);
Py_RETURN_NONE;
}
struct _LevelData
{
GLint m_width;
GLint m_height;
uint8_t* m_data;
size_t m_dataSize;
_LevelData(GLint w, GLint h, uint8_t* ptr, size_t sz)
: m_width(w), m_height(h), m_data(ptr), m_dataSize(sz)
{ }
};
static inline int _get_num_levels(pyGLTexture* self) {
PyObjectRef size = PyObject_GetAttrString(self->m_blenderImage, "size");
float width = (float)PyFloat_AsDouble(PySequence_GetItem(size, 0));
float height = (float)PyFloat_AsDouble(PySequence_GetItem(size, 1));
int num_levels = (int)std::floor(std::log2(std::max(width, height))) + 1;
// Major Workaround Ahoy
// There is a bug in Cyan's level size algorithm that causes it to not allocate enough memory
// for the color block in certain mipmaps. I personally have encountered an access violation on
// 1x1 DXT5 mip levels -- the code only allocates an alpha block and not a color block. Paradox
// reports that if any dimension is smaller than 4px in a mip level, OpenGL doesn't like Cyan generated
// data. So, we're going to lop off the last two mip levels, which should be 1px and 2px as the smallest.
// This bug is basically unfixable without crazy hacks because of the way Plasma reads in texture data.
// "<Deledrius> I feel like any texture at a 1x1 level is essentially academic. I mean, JPEG/DXT
// doesn't even compress that, and what is it? Just the average color of the whole
// texture in a single pixel?"
// :)
return std::max(num_levels - 2, 2);
}
static int _generate_detail_alpha(pyGLTexture* self, GLint level, float* result) {
float dropoff_start, dropoff_stop, detail_max, detail_min;
if (!_get_float(self->m_textureKey, "detail_fade_start", dropoff_start))
return -1;
if (!_get_float(self->m_textureKey, "detail_fade_stop", dropoff_stop))
return -1;
if (!_get_float(self->m_textureKey, "detail_opacity_start", detail_max))
return -1;
if (!_get_float(self->m_textureKey, "detail_opacity_stop", detail_min))
return -1;
dropoff_start /= 100.f;
dropoff_start *= _get_num_levels(self);
dropoff_stop /= 100.f;
dropoff_stop *= _get_num_levels(self);
detail_max /= 100.f;
detail_min /= 100.f;
float alpha = (level - dropoff_start) * (detail_min - detail_max) / (dropoff_stop - dropoff_start) + detail_max;
if (detail_min < detail_max)
*result = std::min(detail_max, std::max(detail_min, alpha));
else
*result = std::min(detail_min, std::max(detail_max, alpha));
return 0;
}
static int _generate_detail_map(pyGLTexture* self, uint8_t* buf, size_t bufsz, GLint level) {
float alpha;
if (_generate_detail_alpha(self, level, &alpha) != 0)
return -1;
PyObjectRef pydetail_blend = PyObject_GetAttrString(self->m_textureKey, "detail_blend");
if (!pydetail_blend)
return -1;
size_t detail_blend = PyLong_AsSize_t(pydetail_blend);
switch (detail_blend) {
case TEX_DETAIL_ALPHA: {
for (size_t i = 0; i < bufsz; i += 4) {
buf[i+3] = (uint8_t)(((float)buf[i+3]) * alpha);
}
}
break;
case TEX_DETAIL_ADD: {
for (size_t i = 0; i < bufsz; i += 4) {
buf[i+0] = (uint8_t)(((float)buf[i+0]) * alpha);
buf[i+1] = (uint8_t)(((float)buf[i+1]) * alpha);
buf[i+2] = (uint8_t)(((float)buf[i+2]) * alpha);
}
}
break;
case TEX_DETAIL_MULTIPLY: {
float invert_alpha = (1.f - alpha) * 255.f;
for (size_t i = 0; i < bufsz; i += 4) {
buf[i+3] = (uint8_t)((invert_alpha + (float)buf[i+3]) * alpha);
}
}
break;
default:
return -1;
}
return 0;
}
static _LevelData _get_level_data(pyGLTexture* self, GLint level, bool bgra, PyObject* report) {
GLint width, height;
glGetTexLevelParameteriv(GL_TEXTURE_2D, level, GL_TEXTURE_WIDTH, &width);
glGetTexLevelParameteriv(GL_TEXTURE_2D, level, GL_TEXTURE_HEIGHT, &height);
GLenum fmt = bgra ? GL_BGRA_EXT : GL_RGBA;
// Print out the debug message
if (report && report != Py_None) {
PyObjectRef msg_func = PyObject_GetAttrString(report, "msg");
PyObjectRef args = Py_BuildValue("siii", "Level #{}: {}x{}", level, width, height);
PyObjectRef kwargs = Py_BuildValue("{s:i}", "indent", 2);
PyObjectRef result = PyObject_Call(msg_func, args, kwargs);
}
size_t bufsz;
bufsz = (width * height * 4);
uint8_t* buf = new uint8_t[bufsz];
glGetTexImage(GL_TEXTURE_2D, level, fmt, GL_UNSIGNED_BYTE, reinterpret_cast<GLvoid*>(buf));
return _LevelData(width, height, buf, bufsz);
}
static PyObject* pyGLTexture_get_level_data(pyGLTexture* self, PyObject* args, PyObject* kwargs) {
static char* kwlist[] = { _pycs("level"), _pycs("calc_alpha"), _pycs("bgra"),
_pycs("report"), _pycs("fast"), NULL };
GLint level = 0;
bool calc_alpha = false;
bool bgra = false;
PyObject* report = nullptr;
bool fast = false;
if (!PyArg_ParseTupleAndKeywords(args, kwargs, "|ibbOb", kwlist, &level, &calc_alpha, &bgra, &report, &fast)) {
PyErr_SetString(PyExc_TypeError, "get_level_data expects an optional int, bool, bool, obejct, bool");
return NULL;
}
_LevelData data = _get_level_data(self, level, bgra, report);
if (fast)
return PyBytes_FromStringAndSize((char*)data.m_data, data.m_dataSize);
// OpenGL returns a flipped image, so we must reflip it.
size_t row_stride = data.m_width * 4;
uint8_t* sptr = data.m_data;
uint8_t* eptr = data.m_data + (data.m_dataSize - row_stride);
uint8_t* temp = new uint8_t[row_stride];
do {
memcpy(temp, sptr, row_stride);
memcpy(sptr, eptr, row_stride);
memcpy(eptr, temp, row_stride);
} while ((sptr += row_stride) < (eptr -= row_stride));
delete[] temp;
// Detail blend
PyObjectRef is_detail_map = PyObject_GetAttrString(self->m_textureKey, "is_detail_map");
if (PyLong_AsLong(is_detail_map) != 0) {
if (_generate_detail_map(self, data.m_data, data.m_dataSize, level) != 0) {
delete[] data.m_data;
PyErr_SetString(PyExc_RuntimeError, "error while baking detail map");
return NULL;
}
}
if (calc_alpha) {
for (size_t i = 0; i < data.m_dataSize; i += 4)
data.m_data[i + 3] = (data.m_data[i + 0] + data.m_data[i + 1] + data.m_data[i + 2]) / 3;
}
return PyBytes_FromStringAndSize((char*)data.m_data, data.m_dataSize);
}
static PyMethodDef pyGLTexture_Methods[] = {
{ _pycs("__enter__"), (PyCFunction)pyGLTexture__enter__, METH_NOARGS, NULL },
{ _pycs("__exit__"), (PyCFunction)pyGLTexture__exit__, METH_VARARGS, NULL },
{ _pycs("generate_mipmap"), (PyCFunction)pyGLTexture_generate_mipmap, METH_NOARGS, NULL },
{ _pycs("get_level_data"), (PyCFunction)pyGLTexture_get_level_data, METH_KEYWORDS | METH_VARARGS, NULL },
{ NULL, NULL, 0, NULL }
};
static PyObject* pyGLTexture_get_has_alpha(pyGLTexture* self, void*) {
_LevelData data = _get_level_data(self, 0, false, nullptr);
for (size_t i = 3; i < data.m_dataSize; i += 4) {
if (data.m_data[i] != 255) {
delete[] data.m_data;
return PyBool_FromLong(1);
}
}
delete[] data.m_data;
return PyBool_FromLong(0);
}
static PyObject* pyGLTexture_get_num_levels(pyGLTexture* self, void*) {
return PyLong_FromLong(_get_num_levels(self));
}
static PyGetSetDef pyGLTexture_GetSet[] = {
{ _pycs("has_alpha"), (getter)pyGLTexture_get_has_alpha, NULL, NULL, NULL },
{ _pycs("num_levels"), (getter)pyGLTexture_get_num_levels, NULL, NULL, NULL },
{ NULL, NULL, NULL, NULL, NULL }
};
PyTypeObject pyGLTexture_Type = {
PyVarObject_HEAD_INIT(NULL, 0)
"_korlib.GLTexture", /* tp_name */
sizeof(pyGLTexture), /* tp_basicsize */
0, /* tp_itemsize */
(destructor)pyGLTexture_dealloc, /* tp_dealloc */
NULL, /* tp_print */
NULL, /* tp_getattr */
NULL, /* tp_setattr */
NULL, /* tp_compare */
NULL, /* tp_repr */
NULL, /* tp_as_number */
NULL, /* tp_as_sequence */
NULL, /* tp_as_mapping */
NULL, /* tp_hash */
NULL, /* tp_call */
NULL, /* tp_str */
NULL, /* tp_getattro */
NULL, /* tp_setattro */
NULL, /* tp_as_buffer */
Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE, /* tp_flags */
"GLTexture", /* tp_doc */
NULL, /* tp_traverse */
NULL, /* tp_clear */
NULL, /* tp_richcompare */
0, /* tp_weaklistoffset */
NULL, /* tp_iter */
NULL, /* tp_iternext */
pyGLTexture_Methods, /* tp_methods */
NULL, /* tp_members */
pyGLTexture_GetSet, /* tp_getset */
NULL, /* tp_base */
NULL, /* tp_dict */
NULL, /* tp_descr_get */
NULL, /* tp_descr_set */
0, /* tp_dictoffset */
(initproc)pyGLTexture___init__, /* tp_init */
NULL, /* tp_alloc */
pyGLTexture_new, /* tp_new */
NULL, /* tp_free */
NULL, /* tp_is_gc */
NULL, /* tp_bases */
NULL, /* tp_mro */
NULL, /* tp_cache */
NULL, /* tp_subclasses */
NULL, /* tp_weaklist */
NULL, /* tp_del */
0, /* tp_version_tag */
NULL, /* tp_finalize */
};
PyObject* Init_pyGLTexture_Type() {
if (PyType_Ready(&pyGLTexture_Type) < 0)
return NULL;
Py_INCREF(&pyGLTexture_Type);
return (PyObject*)&pyGLTexture_Type;
}
};