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-rw-r--r--3rdparty/bgfx/examples/common/image.cpp412
1 files changed, 412 insertions, 0 deletions
diff --git a/3rdparty/bgfx/examples/common/image.cpp b/3rdparty/bgfx/examples/common/image.cpp
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index 00000000000..11163f768d7
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+++ b/3rdparty/bgfx/examples/common/image.cpp
@@ -0,0 +1,412 @@
+/*
+ * Copyright 2011-2017 Branimir Karadzic. All rights reserved.
+ * License: https://github.com/bkaradzic/bgfx#license-bsd-2-clause
+ */
+
+#include "entry/dbg.h"
+
+#include <bgfx/bgfx.h>
+#include <bx/allocator.h>
+#include <bx/endian.h>
+#include <bx/readerwriter.h>
+#include "bgfx_utils.h"
+
+BX_PRAGMA_DIAGNOSTIC_PUSH()
+BX_PRAGMA_DIAGNOSTIC_IGNORED_CLANG_GCC("-Wtype-limits")
+BX_PRAGMA_DIAGNOSTIC_IGNORED_CLANG_GCC("-Wunused-parameter")
+BX_PRAGMA_DIAGNOSTIC_IGNORED_CLANG_GCC("-Wunused-value")
+BX_PRAGMA_DIAGNOSTIC_IGNORED_MSVC(4100) // error C4100: '' : unreferenced formal parameter
+#if BX_PLATFORM_EMSCRIPTEN
+# include <compat/ctype.h>
+#endif // BX_PLATFORM_EMSCRIPTEN
+#define MINIZ_NO_STDIO
+#define TINYEXR_IMPLEMENTATION
+#include <tinyexr/tinyexr.h>
+BX_PRAGMA_DIAGNOSTIC_POP()
+
+#define LODEPNG_NO_COMPILE_ENCODER
+#define LODEPNG_NO_COMPILE_DISK
+#define LODEPNG_NO_COMPILE_ANCILLARY_CHUNKS
+#define LODEPNG_NO_COMPILE_ERROR_TEXT
+#define LODEPNG_NO_COMPILE_ALLOCATORS
+#define LODEPNG_NO_COMPILE_CPP
+#include <lodepng/lodepng.h>
+
+typedef unsigned char stbi_uc;
+extern "C" int stbi_is_hdr_from_memory(stbi_uc const* _buffer, int _len);
+extern "C" stbi_uc* stbi_load_from_memory(stbi_uc const* _buffer, int _len, int* _x, int* _y, int* _comp, int _req_comp);
+extern "C" float* stbi_loadf_from_memory(stbi_uc const* _buffer, int _len, int* _x, int* _y, int* _comp, int _req_comp);
+extern "C" void stbi_image_free(void* _ptr);
+extern void lodepng_free(void* _ptr);
+
+namespace bgfx
+{
+ struct ImageMip
+ {
+ TextureFormat::Enum m_format;
+ uint32_t m_width;
+ uint32_t m_height;
+ uint32_t m_blockSize;
+ uint32_t m_size;
+ uint8_t m_bpp;
+ bool m_hasAlpha;
+ const uint8_t* m_data;
+ };
+
+ uint32_t imageGetSize(
+ TextureInfo* _info
+ , uint16_t _width
+ , uint16_t _height
+ , uint16_t _depth
+ , bool _cubeMap
+ , bool _hasMips
+ , uint16_t _numLayers
+ , TextureFormat::Enum _format
+ );
+
+ ///
+ ImageContainer* imageParseBgfx(bx::AllocatorI* _allocator, const void* _src, uint32_t _size);
+
+ ///
+ bool imageConvert(
+ void* _dst
+ , TextureFormat::Enum _dstFormat
+ , const void* _src
+ , TextureFormat::Enum _srcFormat
+ , uint32_t _width
+ , uint32_t _height
+ );
+
+ ///
+ ImageContainer* imageConvert(
+ bx::AllocatorI* _allocator
+ , TextureFormat::Enum _dstFormat
+ , const ImageContainer& _input
+ );
+
+} // namespace bgfx
+
+namespace bgfx
+{
+ static ImageContainer* imageParseLodePng(bx::AllocatorI* _allocator, const void* _data, uint32_t _size)
+ {
+ static uint8_t pngMagic[] = { 0x89, 0x50, 0x4E, 0x47, 0x0d, 0x0a };
+
+ if (0 != bx::memCmp(_data, pngMagic, sizeof(pngMagic) ) )
+ {
+ return NULL;
+ }
+
+ ImageContainer* output = NULL;
+ bgfx::TextureFormat::Enum format = bgfx::TextureFormat::RGBA8;
+ uint32_t width = 0;
+ uint32_t height = 0;
+
+ unsigned error;
+ LodePNGState state;
+ lodepng_state_init(&state);
+ state.decoder.color_convert = 0;
+
+ uint8_t* data = NULL;
+ error = lodepng_decode(&data, &width, &height, &state, (uint8_t*)_data, _size);
+
+ if (0 == error)
+ {
+ switch (state.info_raw.bitdepth)
+ {
+ case 8:
+ switch (state.info_raw.colortype)
+ {
+ case LCT_GREY:
+ format = bgfx::TextureFormat::R8;
+ break;
+
+ case LCT_GREY_ALPHA:
+ format = bgfx::TextureFormat::RG8;
+ break;
+
+ case LCT_RGB:
+ format = bgfx::TextureFormat::RGB8;
+ break;
+
+ case LCT_RGBA:
+ format = bgfx::TextureFormat::RGBA8;
+ break;
+
+ case LCT_PALETTE:
+ break;
+ }
+ break;
+
+ case 16:
+ switch (state.info_raw.colortype)
+ {
+ case LCT_GREY:
+ for (uint32_t ii = 0, num = width*height; ii < num; ++ii)
+ {
+ uint16_t* rgba = (uint16_t*)data + ii;
+ rgba[0] = bx::toHostEndian(rgba[0], false);
+ }
+ format = bgfx::TextureFormat::R16;
+ break;
+
+ case LCT_GREY_ALPHA:
+ for (uint32_t ii = 0, num = width*height; ii < num; ++ii)
+ {
+ uint16_t* rgba = (uint16_t*)data + ii*2;
+ rgba[0] = bx::toHostEndian(rgba[0], false);
+ rgba[1] = bx::toHostEndian(rgba[1], false);
+ }
+ format = bgfx::TextureFormat::RG16;
+ break;
+
+ case LCT_RGBA:
+ for (uint32_t ii = 0, num = width*height; ii < num; ++ii)
+ {
+ uint16_t* rgba = (uint16_t*)data + ii*4;
+ rgba[0] = bx::toHostEndian(rgba[0], false);
+ rgba[1] = bx::toHostEndian(rgba[1], false);
+ rgba[2] = bx::toHostEndian(rgba[2], false);
+ rgba[3] = bx::toHostEndian(rgba[3], false);
+ }
+ format = bgfx::TextureFormat::RGBA16;
+ break;
+
+ case LCT_RGB:
+ case LCT_PALETTE:
+ break;
+ }
+ break;
+
+ default:
+ break;
+ }
+
+ output = imageAlloc(_allocator
+ , format
+ , uint16_t(width)
+ , uint16_t(height)
+ , 0
+ , 1
+ , false
+ , false
+ , data
+ );
+ }
+
+ lodepng_state_cleanup(&state);
+ lodepng_free(data);
+
+ return output;
+ }
+
+ static ImageContainer* imageParseTinyExr(bx::AllocatorI* _allocator, const void* _data, uint32_t _size)
+ {
+ EXRVersion exrVersion;
+ int result = ParseEXRVersionFromMemory(&exrVersion, (uint8_t*)_data, _size);
+ if (TINYEXR_SUCCESS != result)
+ {
+ return NULL;
+ }
+
+ bgfx::TextureFormat::Enum format = bgfx::TextureFormat::RGBA8;
+ uint32_t width = 0;
+ uint32_t height = 0;
+
+ uint8_t* data = NULL;
+ const char* err = NULL;
+ EXRHeader exrHeader;
+ result = ParseEXRHeaderFromMemory(&exrHeader, &exrVersion, (uint8_t*)_data, _size, &err);
+ if (TINYEXR_SUCCESS == result)
+ {
+ EXRImage exrImage;
+ InitEXRImage(&exrImage);
+
+ result = LoadEXRImageFromMemory(&exrImage, &exrHeader, (uint8_t*)_data, _size, &err);
+ if (TINYEXR_SUCCESS == result)
+ {
+ uint8_t idxR = UINT8_MAX;
+ uint8_t idxG = UINT8_MAX;
+ uint8_t idxB = UINT8_MAX;
+ uint8_t idxA = UINT8_MAX;
+ for (uint8_t ii = 0, num = uint8_t(exrHeader.num_channels); ii < num; ++ii)
+ {
+ const EXRChannelInfo& channel = exrHeader.channels[ii];
+ if (UINT8_MAX == idxR
+ && 0 == bx::strncmp(channel.name, "R") )
+ {
+ idxR = ii;
+ }
+ else if (UINT8_MAX == idxG
+ && 0 == bx::strncmp(channel.name, "G") )
+ {
+ idxG = ii;
+ }
+ else if (UINT8_MAX == idxB
+ && 0 == bx::strncmp(channel.name, "B") )
+ {
+ idxB = ii;
+ }
+ else if (UINT8_MAX == idxA
+ && 0 == bx::strncmp(channel.name, "A") )
+ {
+ idxA = ii;
+ }
+ }
+
+ if (UINT8_MAX != idxR)
+ {
+ const bool asFloat = exrHeader.pixel_types[idxR] == TINYEXR_PIXELTYPE_FLOAT;
+ uint32_t srcBpp = 32;
+ uint32_t dstBpp = asFloat ? 32 : 16;
+ format = asFloat ? TextureFormat::R32F : TextureFormat::R16F;
+ uint32_t stepR = 1;
+ uint32_t stepG = 0;
+ uint32_t stepB = 0;
+ uint32_t stepA = 0;
+
+ if (UINT8_MAX != idxG)
+ {
+ srcBpp += 32;
+ dstBpp = asFloat ? 64 : 32;
+ format = asFloat ? TextureFormat::RG32F : TextureFormat::RG16F;
+ stepG = 1;
+ }
+
+ if (UINT8_MAX != idxB)
+ {
+ srcBpp += 32;
+ dstBpp = asFloat ? 128 : 64;
+ format = asFloat ? TextureFormat::RGBA32F : TextureFormat::RGBA16F;
+ stepB = 1;
+ }
+
+ if (UINT8_MAX != idxA)
+ {
+ srcBpp += 32;
+ dstBpp = asFloat ? 128 : 64;
+ format = asFloat ? TextureFormat::RGBA32F : TextureFormat::RGBA16F;
+ stepA = 1;
+ }
+
+ data = (uint8_t*)BX_ALLOC(_allocator, exrImage.width * exrImage.height * dstBpp/8);
+
+ const float zero = 0.0f;
+ const float* srcR = UINT8_MAX == idxR ? &zero : (const float*)(exrImage.images)[idxR];
+ const float* srcG = UINT8_MAX == idxG ? &zero : (const float*)(exrImage.images)[idxG];
+ const float* srcB = UINT8_MAX == idxB ? &zero : (const float*)(exrImage.images)[idxB];
+ const float* srcA = UINT8_MAX == idxA ? &zero : (const float*)(exrImage.images)[idxA];
+
+ const uint32_t bytesPerPixel = dstBpp/8;
+ for (uint32_t ii = 0, num = exrImage.width * exrImage.height; ii < num; ++ii)
+ {
+ float rgba[4] =
+ {
+ *srcR,
+ *srcG,
+ *srcB,
+ *srcA,
+ };
+ bx::memCopy(&data[ii * bytesPerPixel], rgba, bytesPerPixel);
+
+ srcR += stepR;
+ srcG += stepG;
+ srcB += stepB;
+ srcA += stepA;
+ }
+ }
+
+ FreeEXRImage(&exrImage);
+ }
+
+ FreeEXRHeader(&exrHeader);
+ }
+
+ ImageContainer* output = imageAlloc(_allocator
+ , format
+ , uint16_t(width)
+ , uint16_t(height)
+ , 0
+ , 1
+ , false
+ , false
+ , data
+ );
+ BX_FREE(_allocator, data);
+
+ return output;
+ }
+
+ static ImageContainer* imageParseStbImage(bx::AllocatorI* _allocator, const void* _data, uint32_t _size)
+ {
+ const int isHdr = stbi_is_hdr_from_memory((const uint8_t*)_data, (int)_size);
+
+ void* data;
+ uint32_t width = 0;
+ uint32_t height = 0;
+ int comp = 0;
+ if (isHdr) { data = stbi_loadf_from_memory((const uint8_t*)_data, (int)_size, (int*)&width, (int*)&height, &comp, 4); }
+ else { data = stbi_load_from_memory ((const uint8_t*)_data, (int)_size, (int*)&width, (int*)&height, &comp, 0); }
+
+ if (NULL == data)
+ {
+ return NULL;
+ }
+
+ bgfx::TextureFormat::Enum format;
+ if (isHdr)
+ {
+ format = bgfx::TextureFormat::RGBA32F;
+ }
+ else
+ {
+ if (1 == comp) { format = bgfx::TextureFormat::R8; }
+ else if (2 == comp) { format = bgfx::TextureFormat::RG8; }
+ else if (3 == comp) { format = bgfx::TextureFormat::RGB8; }
+ else/*if (4 == comp)*/ { format = bgfx::TextureFormat::RGBA8; }
+ }
+
+ ImageContainer* output = imageAlloc(_allocator
+ , format
+ , uint16_t(width)
+ , uint16_t(height)
+ , 0
+ , 1
+ , false
+ , false
+ , data
+ );
+ stbi_image_free(data);
+
+ return output;
+ }
+
+ ImageContainer* imageParse(bx::AllocatorI* _allocator, const void* _data, uint32_t _size, TextureFormat::Enum _dstFormat)
+ {
+ ImageContainer* input = imageParseBgfx (_allocator, _data, _size) ;
+ input = NULL == input ? imageParseLodePng (_allocator, _data, _size) : input;
+ input = NULL == input ? imageParseTinyExr (_allocator, _data, _size) : input;
+ input = NULL == input ? imageParseStbImage(_allocator, _data, _size) : input;
+
+ if (NULL == input)
+ {
+ return NULL;
+ }
+
+ _dstFormat = TextureFormat::Count == _dstFormat
+ ? input->m_format
+ : _dstFormat
+ ;
+
+ if (_dstFormat == input->m_format)
+ {
+ return input;
+ }
+
+ ImageContainer* output = imageConvert(_allocator, _dstFormat, *input);
+ imageFree(input);
+
+ return output;
+ }
+
+} // namespace bgfx