ImageBasedDensityProvider::ImageBasedDensityProvider(const std::string filename, const AABB model_aabb)
{
int desired_channel_count = 0; // keep original amount of channels
int img_x, img_y, img_z; // stbi requires pointer to int rather than to coord_t
image = stbi_load(filename.c_str(), &img_x, &img_y, &img_z, desired_channel_count);
image_size = Point3(img_x, img_y, img_z);
if (!image)
{
const char* reason = "[unknown reason]";
if (stbi_failure_reason())
{
reason = stbi_failure_reason();
}
logError("Cannot load image %s: '%s'.\n", filename.c_str(), reason);
std::exit(-1);
}
{ // compute aabb
Point middle = model_aabb.getMiddle();
Point model_aabb_size = model_aabb.max - model_aabb.min;
Point image_size2 = Point(image_size.x, image_size.y);
float aabb_aspect_ratio = float(model_aabb_size.X) / float(model_aabb_size.Y);
float image_aspect_ratio = float(image_size.x) / float(image_size.y);
Point aabb_size;
if (image_aspect_ratio < aabb_aspect_ratio)
{
aabb_size = image_size2 * model_aabb_size.X / image_size.x;
}
else
{
aabb_size = image_size2 * model_aabb_size.Y / image_size.y;
}
print_aabb = AABB(middle - aabb_size / 2, middle + aabb_size / 2);
assert(aabb_size.X >= model_aabb_size.X && aabb_size.Y >= model_aabb_size.Y);
}
}
int main(int argc, char** argv)
{
if (argc < 2)
{
std::cerr << "Use " << argv[0] << " filename" << std::endl;
return 1;
}
// load image
int width, height, nc;
float* rgba = stbi_loadf(argv[1], &width, &height, &nc, 4);
if (stbi_failure_reason())
{
std::cerr << "stbi: " << stbi_failure_reason() << std::endl;
return 1;
}
// create summed area table of luminance image
summed_area_table lum_sat;
lum_sat.create_lum(rgba, width, height, 4);
// apply median cut
std::vector<sat_region> regions;
median_cut(lum_sat, 9, regions); // max 2^n cuts
// create 2d positions from regions
std::vector<float2> lights;
create_lights(regions, lights);
// draw a marker into image for each position
size_t i = 0;
for (auto l = lights.begin(); l != lights.end(); ++l)
{
std::cout << "Light " << i++ << ": (" << l->x << ", " << l->y << ")" << std::endl;
draw(rgba, width, height, *l);
}
// save image with marked samples
std::vector<unsigned char> conv;
conv.resize(width*height*4);
for (size_t i = 0; i < width * height * 4; ++i)
conv[i] = static_cast<unsigned char>(rgba[i]*255);
stbi_write_bmp("test.bmp", width, height, 4, &conv[0]);
return 0;
}
bool LoadImage( Image* image, const char* vfsPath )
{
memset(image, 0, sizeof(Image));
PHYSFS_File* file = PHYSFS_openRead(vfsPath);
if(!file)
{
Error("Can't load '%s': %s", vfsPath, PHYSFS_getLastError());
return false;
}
stbi_set_flip_vertically_on_load(1);
image->data = stbi_load_from_callbacks(&PhysFSCallbacks,
file,
&image->width,
&image->height,
&image->channelCount,
STBI_default);
PHYSFS_close(file);
if(!image->data)
{
Error("Can't load '%s': %s", vfsPath, stbi_failure_reason());
return false;
}
image->type = GL_UNSIGNED_BYTE;
return true;
}
void FileImage::load_file()
{
FSFile fp(filename.c_str(), "r");
if (!fp.is_open()) {
printf("Could not open image \"%s\"\n", filename.c_str());
return;
}
int w, h, channels;
image = load_image(fp, fp.get_size(), &w, &h, &channels);
width = w;
height = h;
fp.close();
if (image == NULL) {
printf("Could not load image \"%s\": %s\n", filename.c_str(),
stbi_failure_reason());
return;
}
if (!transparent.is_enabled())
return;
#ifndef CHOWDREN_FORCE_TRANSPARENT
if (channels != 1 && channels != 3)
return;
#endif
set_transparent_color(transparent);
}
Stb::ImagePtr Stb::Image::loadFromStream(std::istream & s, Format fmt)
{
ImagePtr image = std::static_pointer_cast<Image>(std::make_shared<Image::Wrapper>());
try
{
int imageFmt = UNKNOWN;
image->m_Data = stbi_load_from_callbacks(&g_StbCB, &s, &image->m_Width, &image->m_Height, &imageFmt, fmt);
if (!image->m_Data)
throw std::runtime_error(stbi_failure_reason());
image->m_Format = static_cast<Format>(fmt == UNKNOWN ? imageFmt : fmt);
if (image->m_Format == UNKNOWN)
throw std::runtime_error("unable to determine pixel format for the image.");
}
catch (const std::exception & e)
{
if (image->m_Data)
stbi_image_free(image->m_Data);
std::clog << "Error reading image: " << e.what() << std::endl;
image->m_Data = &g_DummyData;
image->m_Width = 0;
image->m_Height = 0;
image->m_Format = UNKNOWN;
}
return image;
}
bool ImageLoader::loadImageFromFile(const std::string& filename, std::vector<Uint8>& pixels, unsigned int& width, unsigned int& height)
{
// Clear the array (just in case)
pixels.clear();
// Load the image and get a pointer to the pixels in memory
int imgWidth, imgHeight, imgChannels;
unsigned char* ptr = stbi_load(filename.c_str(), &imgWidth, &imgHeight, &imgChannels, STBI_rgb_alpha);
if (ptr && imgWidth && imgHeight)
{
// Assign the image properties
width = imgWidth;
height = imgHeight;
// Copy the loaded pixels to the pixel buffer
pixels.resize(width * height * 4);
memcpy(&pixels[0], ptr, pixels.size());
// Free the loaded pixels (they are now in our own pixel buffer)
stbi_image_free(ptr);
return true;
}
else
{
// Error, failed to load the image
err() << "Failed to load image \"" << filename << "\". Reason : " << stbi_failure_reason() << std::endl;
return false;
}
}
void Image::load()
{
flags |= USED;
if (tex != 0 || image != NULL)
return;
if (flags & FILE) {
((FileImage*)this)->load_file();
return;
}
open_image_file();
image_file.set_item(handle, AssetFile::IMAGE_DATA);
FileStream stream(image_file);
hotspot_x = stream.read_int16();
hotspot_y = stream.read_int16();
action_x = stream.read_int16();
action_y = stream.read_int16();
int size = stream.read_uint32();
int w, h, channels;
image = load_image(image_file, size, &w, &h, &channels);
width = w;
height = h;
if (image == NULL) {
std::cout << "Could not load image " << handle << std::endl;
std::cout << stbi_failure_reason() << std::endl;
return;
}
}
void Stb::Read(SoyPixelsImpl& Pixels,const ArrayBridge<char>& ArrayBuffer,TReadFunction ReadFunction)
{
#if defined(USE_STB)
const stbi_uc* Buffer = reinterpret_cast<const stbi_uc*>( ArrayBuffer.GetArray() );
auto BufferSize = size_cast<int>( ArrayBuffer.GetDataSize() );
int Width = 0;
int Height = 0;
int Channels = 0;
int RequestedChannels = 4;
auto* DecodedPixels = stbi_load_from_memory( Buffer, BufferSize, &Width, &Height, &Channels, RequestedChannels );
if ( !DecodedPixels )
{
// gr: as this is not thread safe, it could come out mangled :( maybe add a lock around error popping before read (maybe have to lock around the whole thing)
auto* StbError = stbi_failure_reason();
if ( !StbError )
StbError = "Unknown error";
std::stringstream Error;
Error << "Failed to read image pixels; " << StbError;
throw Soy::AssertException( Error.str() );
}
// convert output into pixels
// gr: have to assume size
auto Format = SoyPixelsFormat::GetFormatFromChannelCount( Channels );
SoyPixelsMeta Meta( Width, Height, Format );
SoyPixelsRemote OutputPixels( DecodedPixels, Meta.GetDataSize(), Meta );
Pixels.Copy( OutputPixels );
#else
throw Soy::AssertException("No STB support, no image reading");
#endif
}
void StbImageFactory::load(ResourceData *resource)
{
StbImage* stbresource = static_cast<StbImage*>(resource);
int x,y,comp;
stbi_uc* data = stbi_load(stbresource->path().toLocal8Bit().data(), &x, &y, &comp, stbresource->m_comp);
if(data != 0)
{
logInfo( "StbImage loaded " << resource->name() << " (" << x << "x" << y << ")");
stbresource->m_data = data;
stbresource->m_width = x;
stbresource->m_height = y;
// If we asked 0 components comp now contains the number of components
if(stbresource->m_comp == 0)
stbresource->m_comp = comp;
stbresource->m_state = StbImage::STATE_LOADED;
stbresource->buildTexture();
}
else
{
logWarn( "StbImage failed to load " << resource->name() << "\n" << stbi_failure_reason());
}
}
static int load_embedded_image(lua_State *L) {
am_check_nargs(L, 1);
const char *filename = luaL_checkstring(L, 1);
am_embedded_file_record *rec = am_get_embedded_file(filename);
if (rec == NULL) {
return luaL_error(L, "embedded file not found: %s", filename);
}
int width, height;
int components = 4;
stbi_set_flip_vertically_on_load(1);
stbi_uc *img_data =
stbi_load_from_memory((stbi_uc const *)rec->data, rec->len, &width, &height, &components, 4);
if (img_data == NULL) {
return luaL_error(L, "error loading image %s: %s", filename, stbi_failure_reason());
}
am_image_buffer *img = am_new_userdata(L, am_image_buffer);
img->width = width;
img->height = height;
img->format = AM_PIXEL_FORMAT_RGBA8;
int sz = width * height * pixel_format_size(img->format);
am_buffer *imgbuf = am_new_userdata(L, am_buffer);
imgbuf->size = sz;
imgbuf->data = img_data;
img->buffer = imgbuf;
img->buffer_ref = img->ref(L, -1);
lua_pop(L, 1); // pop imgbuf
return 1;
}
static int load_image(lua_State *L) {
am_check_nargs(L, 1);
char *errmsg;
int len;
const char *filename = luaL_checkstring(L, 1);
void *data = am_read_resource(filename, &len, &errmsg);
if (data == NULL) {
lua_pushstring(L, errmsg);
free(errmsg);
return lua_error(L);
}
int width, height;
int components = 4;
stbi_set_flip_vertically_on_load(1);
stbi_uc *img_data =
stbi_load_from_memory((stbi_uc const *)data, len, &width, &height, &components, 4);
free(data);
if (img_data == NULL) {
return luaL_error(L, "error loading image %s: %s", filename, stbi_failure_reason());
}
am_image_buffer *img = am_new_userdata(L, am_image_buffer);
img->width = width;
img->height = height;
img->format = AM_PIXEL_FORMAT_RGBA8;
int sz = width * height * pixel_format_size(img->format);
am_buffer *imgbuf = am_new_userdata(L, am_buffer);
imgbuf->size = sz;
imgbuf->data = img_data;
img->buffer = imgbuf;
img->buffer_ref = img->ref(L, -1);
lua_pop(L, 1); // pop imgbuf
return 1;
}
void cImage::LoadFromPack( cPack * Pack, const std::string& FilePackPath ) {
if ( NULL != Pack && Pack->IsOpen() && -1 != Pack->Exists( FilePackPath ) ) {
SafeDataPointer PData;
Pack->ExtractFileToMemory( FilePackPath, PData );
int w, h, c;
Uint8 * data = stbi_load_from_memory( PData.Data, PData.DataSize, &w, &h, &c, mChannels );
if ( NULL != data ) {
mPixels = data;
mWidth = (eeUint)w;
mHeight = (eeUint)h;
if ( STBI_default == mChannels )
mChannels = (eeUint)c;
mSize = mWidth * mHeight * mChannels;
mLoadedFromStbi = true;
} else {
eePRINTL( "Failed to load image %s. Reason: %s", stbi_failure_reason(), FilePackPath.c_str() );
}
} else {
eePRINTL( "Failed to load image %s from pack.", FilePackPath.c_str() );
}
}
Image load_image(const std::string& filename, Image::Format format)
{
int32_t width, height;
auto data = stbi_load(filename.c_str(), &width, &height, nullptr, format);
if (!data)
std::cerr << stbi_failure_reason() << std::endl;
return Image(width, height, format, data);
}
bool Image::LoadFile( uint8_t * data, int32_t size )
{
this->bpp = 4;
stbi_convert_iphone_png_to_rgb(1);
this->pixels = stbi_load_from_memory(data, (int)size, (int*)&this->width, (int*)&this->height, (int*)&this->original_bpp, this->bpp);
if ( this->pixels == NULL )
{
std::cout << "elix::Image:" << stbi_failure_reason() << std::endl;
this->length = 0;
return false;
}
if ( this->bpp != 4 )
{
std::cout << "this->bpp:" << this->bpp << "-" << stbi_failure_reason() << std::endl;
}
this->length = this->width * this->height * this->bpp;
return true;
}
Texture2D loadTexture(u8 *image_data, u64 image_size, RenderContext *render_context, RenderContext::Format format, int force_components) {
int tex_w, tex_h, tex_comps;
stbi_set_flip_vertically_on_load(true);
u8 *tex_data = (u8 *)stbi_loadf_from_memory((stbi_uc *)image_data, image_size, &tex_w, &tex_h, &tex_comps, force_components);
const char *fail_reason = stbi_failure_reason();
Texture2D result = render_context->createTexture2D(tex_data, (u32)tex_w, (u32)tex_h, format);
stbi_image_free(tex_data);
return result;
}
std::string StbContext::GetError()
{
// gr: as this is not thread safe, it could come out mangled :( maybe add a lock around error popping before read (maybe have to lock around the whole thing)
auto* StbError = stbi_failure_reason();
if ( !StbError )
return "Unknown error";
return StbError;
}
Bitmap Bitmap::bitmapFromFile(std::string filePath) {
int width, height, channels;
unsigned char* pixels = stbi_load(filePath.c_str(), &width, &height, &channels, 0);
if(!pixels) throw std::runtime_error(stbi_failure_reason());
Bitmap bmp(width, height, (Format)channels, pixels);
stbi_image_free(pixels);
return bmp;
}
//---------------------------------------------------------------------
Codec::DecodeResult STBIImageCodec::decode(DataStreamPtr& input) const
{
// Buffer stream into memory (TODO: override IO functions instead?)
MemoryDataStream memStream(input, true);
int width, height, components;
stbi_uc* pixelData = stbi_load_from_memory(memStream.getPtr(),
static_cast<int>(memStream.size()), &width, &height, &components, 0);
if (!pixelData)
{
OGRE_EXCEPT(Exception::ERR_INTERNAL_ERROR,
"Error decoding image: " + String(stbi_failure_reason()),
"STBIImageCodec::decode");
}
SharedPtr<ImageData> imgData(OGRE_NEW ImageData());
MemoryDataStreamPtr output;
imgData->depth = 1; // only 2D formats handled by this codec
imgData->width = width;
imgData->height = height;
imgData->num_mipmaps = 0; // no mipmaps in non-DDS
imgData->flags = 0;
switch( components )
{
case 1:
imgData->format = PF_BYTE_L;
break;
case 2:
imgData->format = PF_BYTE_LA;
break;
case 3:
imgData->format = PF_BYTE_RGB;
break;
case 4:
imgData->format = PF_BYTE_RGBA;
break;
default:
stbi_image_free(pixelData);
OGRE_EXCEPT(Exception::ERR_ITEM_NOT_FOUND,
"Unknown or unsupported image format",
"STBIImageCodec::decode");
break;
}
size_t dstPitch = imgData->width * PixelUtil::getNumElemBytes(imgData->format);
imgData->size = dstPitch * imgData->height;
output.bind(OGRE_NEW MemoryDataStream(pixelData, imgData->size, true));
DecodeResult ret;
ret.first = output;
ret.second = imgData;
return ret;
}
TextureResourceData* TextureLoader_stbi(ResourceDataSource &dataSource, Allocator &alloc, bool forceRGBA)
{
stbi_io_callbacks callbacks;
callbacks.read = read;
callbacks.skip = skip;
callbacks.eof = eof;
int x, y, bpp;
auto pixels = stbi_load_from_callbacks(&callbacks, &dataSource, &x, &y, &bpp, forceRGBA ? 4 : 0);
if (!pixels)
{
#ifdef STB_DO_ERROR_PRINT
DFLOG_WARN(stbi_failure_reason());
#endif
return nullptr;
}
auto fmt = PixelFormat::INVALID;
if (bpp == STBI_rgb)
{
fmt = PixelFormat::RGB;
}
else if (bpp == STBI_rgb_alpha)
{
fmt = PixelFormat::RGBA;
}
else
{
DFLOG_WARN("Parsed image with an invalid bpp");
stbi_image_free(pixels);
return nullptr;
}
if (forceRGBA)
fmt = PixelFormat::RGBA;
auto resource = MAKE_NEW(alloc, TextureResourceData);
resource->format = fmt;
resource->mipLevels.resize(1);
resource->mipLevels[0].width = x;
resource->mipLevels[0].height = y;
int compCount = forceRGBA ? 4 : bpp;
resource->mipLevels[0].pixels.resize(compCount * x * y);
memcpy(resource->mipLevels[0].pixels.data(), pixels, compCount * x * y);
stbi_image_free(pixels);
return resource;
}
bool Texture::load(std::string filename)
{
int width, height, channels;
unsigned char* ptr = stbi_load(filename.c_str(), &width, &height, &channels, STBI_rgb_alpha);
bool result = false;
if (ptr && width && height) result = load(ptr, width, height);
else printLog("Failed to load image \"%s\". Reason : %s\n", filename.c_str(), stbi_failure_reason());
stbi_image_free(ptr);
return result;
}
cImage::cImage( std::string Path, const eeUint& forceChannels ) :
mPixels(NULL),
mWidth(0),
mHeight(0),
mChannels(forceChannels),
mSize(0),
mAvoidFree(false),
mLoadedFromStbi(false)
{
int w, h, c;
cPack * tPack = NULL;
Uint8 * data = stbi_load( Path.c_str(), &w, &h, &c, mChannels );
if ( NULL == data ) {
data = stbi_load( ( Sys::GetProcessPath() + Path ).c_str(), &w, &h, &c, mChannels );
}
if ( NULL != data ) {
mPixels = data;
mWidth = (eeUint)w;
mHeight = (eeUint)h;
if ( STBI_default == mChannels )
mChannels = (eeUint)c;
mSize = mWidth * mHeight * mChannels;
mLoadedFromStbi = true;
} else if ( cPackManager::instance()->FallbackToPacks() && NULL != ( tPack = cPackManager::instance()->Exists( Path ) ) ) {
LoadFromPack( tPack, Path );
} else {
std::string reason = ".";
if ( NULL != stbi_failure_reason() ) {
reason = ", reason: " + std::string( stbi_failure_reason() );
}
eePRINTL( "Failed to load image %s. Reason: %s", Path.c_str(), reason.c_str() );
}
}
bool STB_Image_Loader::decode(ResourceLoadOptions& options)
{
std::vector<uint8> data;
StreamRead(options.stream, data);
if( data.empty() ) return false;
int width, height, comp;
byte* pixelData = stbi_load_from_memory(
&data[0], data.size(), &width, &height,
&comp, 0 /* 0=auto-detect, 3=RGB, 4=RGBA */ );
if( !pixelData )
{
const char* error = stbi_failure_reason();
LogError("STB image error: %s", error);
return false;
}
// Build our image with the pixel data returned by stb_image.
PixelFormat pf = PixelFormat::Unknown;
switch( comp )
{
case 0:
case 1: break;
case 3: pf = PixelFormat::R8G8B8; break;
case 4: pf = PixelFormat::R8G8B8A8; break;
}
if( pf == PixelFormat::Unknown )
{
LogError( "Implement support for more pixel formats" );
return false;
}
std::vector<byte> buffer;
uint32 size = width*height*comp;
buffer.resize(size);
memcpy(&buffer[0], pixelData, size);
free(pixelData);
Image* image = static_cast<Image*>( options.resource );
image->setWidth( width );
image->setHeight( height );
image->setPixelFormat( pf );
image->setBuffer( buffer );
return true;
}
bool Texture::load(const void* memFile, std::size_t size)
{
int width, height, channels;
const unsigned char* buffer = static_cast<const unsigned char*>(memFile);
unsigned char* ptr = stbi_load_from_memory(buffer, static_cast<int>(size), &width, &height, &channels, STBI_rgb_alpha);
bool result = false;
if (ptr && width && height) result = load(ptr, width, height);
else printLog("Failed to load image from memory. Reason : %s\n", stbi_failure_reason());
stbi_image_free(ptr);
return result;
}
static unsigned char *read_zip_file(FILE *file, int offset, int *sizep)
{
int sig, method, csize, usize;
int namelength, extralength;
char *cdata, *udata;
fseek(file, offset, 0);
sig = getlong(file);
if (sig != ZIP_LOCAL_FILE_SIG) {
warn("zip: wrong signature for local file");
return NULL;
}
(void) getshort(file); /* version */
(void) getshort(file); /* general */
method = getshort(file);
(void) getshort(file); /* file time */
(void) getshort(file); /* file date */
(void) getlong(file); /* crc-32 */
csize = getlong(file); /* csize */
usize = getlong(file); /* usize */
namelength = getshort(file);
extralength = getshort(file);
fseek(file, namelength + extralength, 1);
if (method == 0 && csize == usize) {
cdata = malloc(csize);
fread(cdata, 1, csize, file);
*sizep = csize;
return (unsigned char*) cdata;
}
if (method == 8) {
cdata = malloc(csize);
fread(cdata, 1, csize, file);
udata = malloc(usize);
usize = stbi_zlib_decode_noheader_buffer(udata, usize, cdata, csize);
free(cdata);
if (usize < 0) {
warn("zip: %s", stbi_failure_reason());
return NULL;
}
*sizep = usize;
return (unsigned char*) udata;
}
warn("zip: unknown compression method");
return NULL;
}
bool Texture::load(const std::string &path, GLenum min_filter, GLenum mag_filter, GLenum wrap_s, GLenum wrap_t) {
int width, height, perPixComp;
const char *image_path = path.c_str();
unsigned char* image = stbi_load(image_path, &width, &height, &perPixComp, 3);
if (!image) {
std::cout << "ERROR::TEXTURE::LOADING_FAILED\n" << stbi_failure_reason() << std::endl;
return false;
} else {
load(image, width, height, min_filter, mag_filter, wrap_s, wrap_t);
stbi_image_free(image);
}
return true;
}
int Render::loadTexture(string texture_file, string texture_name)
{
//std::string path(GLSL_SOURCE_DIR);
//path += "../../../sprites/boid.png";
//path += "../../../sprites/enjalot.jpg";
printf("LOAD TEXTURE!!!!!!!!!!!!!!\n");
//printf("path: %s\n", path.c_str());
//Load an image with stb_image
int w,h,channels;
int force_channels = 0;
unsigned char *im = stbi_load( texture_file.c_str(), &w, &h, &channels, force_channels );
printf("after load w: %d h: %d channels: %d\n", w, h, channels);
printf("im looking for the image at %s\n", texture_file.c_str());
if (im == NULL)
{
printf("fail!: %s\n", stbi_failure_reason());
printf("WTF\n");
}
//load as gl texture
glGenTextures(1, &gl_textures[texture_name]);
glBindTexture(GL_TEXTURE_2D, gl_textures[texture_name]);
glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
//better way to do this?
if(channels == 3)
{
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, w, h, 0,
GL_RGB, GL_UNSIGNED_BYTE, &im[0]);
}
else if (channels == 4)
{
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, w, h, 0,
GL_RGBA, GL_UNSIGNED_BYTE, &im[0]);
}
glBindTexture(GL_TEXTURE_2D,0);
free(im);
return 0; //success
}
Image load_image( const char* filename )
{
i32 width;
i32 height;
i32 format;
// Using NULL because stbi_load takes an integer and nullptr
// has type nullptr_t.
u8* pixels = stbi_load( filename, &width, &height, &format, 0 );
defer( stbi_image_free( pixels ) );
if ( !pixels )
throw std::runtime_error( stbi_failure_reason() );
return load_image( width, height, (ImageFormat)format, pixels );
}
TexturePtr Texture::load(const char* path)
{
int width;
int height;
int comp;
stbi_set_flip_vertically_on_load(1); // we need to flip the y axis due to OpenGL
unsigned char* data = stbi_load(path, &width, &height, &comp, STBI_rgb_alpha);
if (data == nullptr)
{
std::cout << "Texture::load error: there was a problem loading the texture " << path << std::endl;
std::cout << "STBI: " << stbi_failure_reason() << std::endl;
return nullptr;
}
return TexturePtr(new Texture(data, width, height, comp, path));
}
kit::Texture::Ptr kit::Texture::create2DFromFile(std::string filename, kit::Texture::InternalFormat format, kit::Texture::EdgeSamplingMode edgemode, kit::Texture::FilteringMode minfilter, kit::Texture::FilteringMode magfilter)
{
std::cout << "Loading texture from file " << filename.c_str() << std::endl;
kit::Texture::Ptr returner = std::make_shared<kit::Texture>(Texture2D);
returner->m_internalFormat = format;
// Try to load data from file
unsigned char* bufferdata;
int x, y, n;
stbi_set_flip_vertically_on_load(1);
bufferdata = stbi_load(filename.c_str(), &x, &y, &n, 4);
if (bufferdata == nullptr)
{
KIT_ERR(stbi_failure_reason());
x = 1;
y = 1;
n = 4;
bufferdata = new unsigned char[4];
bufferdata[0] = 255;
bufferdata[1] = 0;
bufferdata[2] = 0;
bufferdata[3] = 255;
}
// Set resolution
returner->m_resolution = glm::uvec3(x, y, 0);
// Specify storage and upload data to GPU
KIT_GL(glTextureStorage2D(returner->m_glHandle, returner->calculateMipLevels(), returner->m_internalFormat, returner->m_resolution.x, returner->m_resolution.y));
KIT_GL(glTextureSubImage2D(returner->m_glHandle, 0, 0, 0, x, y, GL_RGBA, GL_UNSIGNED_BYTE, bufferdata));
// Free loaded data
stbi_image_free(bufferdata);
// Set parameters
returner->setEdgeSamplingMode(edgemode);
returner->setMinFilteringMode(minfilter);
returner->setMagFilteringMode(magfilter);
returner->setAnisotropicLevel(8.0f);
// Generate mipmap
returner->generateMipmap();
return returner;
}
bool ImageLoader::loadImageFromMemory(const void* data, std::size_t dataSize, std::vector<Uint8>& pixels, Vector2u& size)
{
// Check input parameters
if (data && dataSize)
{
// Clear the array (just in case)
pixels.clear();
// Load the image and get a pointer to the pixels in memory
int width = 0;
int height = 0;
int channels = 0;
const unsigned char* buffer = static_cast<const unsigned char*>(data);
unsigned char* ptr = stbi_load_from_memory(buffer, static_cast<int>(dataSize), &width, &height, &channels, STBI_rgb_alpha);
if (ptr)
{
// Assign the image properties
size.x = width;
size.y = height;
if (width && height)
{
// Copy the loaded pixels to the pixel buffer
pixels.resize(width * height * 4);
memcpy(&pixels[0], ptr, pixels.size());
}
// Free the loaded pixels (they are now in our own pixel buffer)
stbi_image_free(ptr);
return true;
}
else
{
// Error, failed to load the image
err() << "Failed to load image from memory. Reason: " << stbi_failure_reason() << std::endl;
return false;
}
}
else
{
err() << "Failed to load image from memory, no data provided" << std::endl;
return false;
}
}
