计算机图形学——opengl实现fbx模型导入

/* stbi-1.16 - public domain JPEG/PNG reader - http://nothings.org/stb_image.c when you control the images you're loading QUICK NOTES: Primarily of interest to game developers and other people who can avoid problematic images and only need the trivial interface JPEG baseline (no JPEG progressive, no oddball channel decimations) PNG non-interlaced BMP non-1bpp, non-RLE TGA (not sure what subset, if a subset) PSD (composited view only, no extra channels) HDR (radiance rgbE format) writes BMP,TGA (define STBI_NO_WRITE to remove code) decoded from memory or through stdio FILE (define STBI_NO_STDIO to remove code) supports installable dequantizing-IDCT, YCbCr-to-RGB conversion (define STBI_SIMD) TODO: stbi_info_* history: 1.16 major bugfix - convert_format converted one too many pixels 1.15 initialize some fields for thread safety 1.14 fix threadsafe conversion bug; header-file-only version (#define STBI_HEADER_FILE_ONLY before including) 1.13 threadsafe 1.12 const qualifiers in the API 1.11 Support installable IDCT, colorspace conversion routines 1.10 Fixes for 64-bit (don't use "unsigned long") optimized upsampling by Fabian "ryg" Giesen 1.09 Fix format-conversion for PSD code (bad global variables!) 1.08 Thatcher Ulrich's PSD code integrated by Nicolas Schulz 1.07 attempt to fix C++ warning/errors again 1.06 attempt to fix C++ warning/errors again 1.05 fix TGA loading to return correct *comp and use good luminance calc 1.04 default float alpha is 1, not 255; use 'void *' for stbi_image_free 1.03 bugfixes to STBI_NO_STDIO, STBI_NO_HDR 1.02 support for (subset of) HDR files, float interface for preferred access to them 1.01 fix bug: possible bug in handling right-side up bmps... not sure fix bug: the stbi_bmp_load() and stbi_tga_load() functions didn't work at all 1.00 interface to zlib that skips zlib header 0.99 correct handling of alpha in palette 0.98 TGA loader by lonesock; dynamically add loaders (untested) 0.97 jpeg errors on too large a file; also catch another malloc failure 0.96 fix detection of invalid v value - particleman@mollyrocket forum 0.95 during header scan, seek to markers in case of padding 0.94 STBI_NO_STDIO to disable stdio usage; rename all #defines the same 0.93 handle jpegtran output; verbose errors 0.92 read 4,8,16,24,32-bit BMP files of several formats 0.91 output 24-bit Windows 3.0 BMP files 0.90 fix a few more warnings; bump version number to approach 1.0 0.61 bugfixes due to Marc LeBlanc, Christopher Lloyd 0.60 fix compiling as c++ 0.59 fix warnings: merge Dave Moore's -Wall fixes 0.58 fix bug: zlib uncompressed mode len/nlen was wrong endian 0.57 fix bug: jpg last huffman symbol before marker was >9 bits but less than 16 available 0.56 fix bug: zlib uncompressed mode len vs. nlen 0.55 fix bug: restart_interval not initialized to 0 0.54 allow NULL for 'int *comp' 0.53 fix bug in png 3->4; speedup png decoding 0.52 png handles req_comp=3,4 directly; minor cleanup; jpeg comments 0.51 obey req_comp requests, 1-component jpegs return as 1-component, on 'test' only check type, not whether we support this variant */ #include "stb_image_aug.h" #ifndef STBI_NO_HDR #include <math.h> // ldexp #include <string.h> // strcmp #endif #ifndef STBI_NO_STDIO #include <stdio.h> #endif #include <stdlib.h> #include <memory.h> #include <assert.h> #include <stdarg.h> #ifndef _MSC_VER #ifdef __cplusplus #define __forceinline inline #else #define __forceinline #endif #endif // implementation: typedef unsigned char uint8; typedef unsigned short uint16; typedef signed short int16; typedef unsigned int uint32; typedef signed int int32; typedef unsigned int uint; // should produce compiler error if size is wrong typedef unsigned char validate_uint32[sizeof(uint32)==4]; #if defined(STBI_NO_STDIO) && !defined(STBI_NO_WRITE) #define STBI_NO_WRITE #endif #ifndef STBI_NO_DDS #include "stbi_DDS_aug.h" #endif // I (JLD) want full messages for SOIL #define STBI_FAILURE_USERMSG 1 ////////////////////////////////////////////////////////////////////////////// // // Generic API that works on all image types // // this is not threadsafe static char *failure_reason; char *stbi_failure_reason(void) { return failure_reason; } static int e(char *str) { failure_reason = str; return 0; } #ifdef STBI_NO_FAILURE_STRINGS #define e(x,y) 0 #elif defined(STBI_FAILURE_USERMSG) #define e(x,y) e(y) #else #define e(x,y) e(x) #endif #define epf(x,y) ((float *) (e(x,y)?NULL:NULL)) #define epuc(x,y) ((unsigned char *) (e(x,y)?NULL:NULL)) void stbi_image_free(void *retval_from_stbi_load) { free(retval_from_stbi_load); } #define MAX_LOADERS 32 stbi_loader *loaders[MAX_LOADERS]; static int max_loaders = 0; int stbi_register_loader(stbi_loader *loader) { int i; for (i=0; i < MAX_LOADERS; ++i) { // already present? if (loaders[i] == loader) return 1; // end of the list? if (loaders[i] == NULL) { loaders[i] = loader; max_loaders = i+1; return 1; } } // no room for it return 0; } #ifndef STBI_NO_HDR static float *ldr_to_hdr(stbi_uc *data, int x, int y, int comp); static stbi_uc *hdr_to_ldr(float *data, int x, int y, int comp); #endif #ifndef STBI_NO_STDIO unsigned char *stbi_load(char const *filename, int *x, int *y, int *comp, int req_comp) { FILE *f = fopen(filename, "rb"); unsigned char *result; if (!f) return epuc("can't fopen", "Unable to open file"); result = stbi_load_from_file(f,x,y,comp,req_comp); fclose(f); return result; } unsigned char *stbi_load_from_file(FILE *f, int *x, int *y, int *comp, int req_comp) { int i; if (stbi_jpeg_test_file(f)) return stbi_jpeg_load_from_file(f,x,y,comp,req_comp); if (stbi_png_test_file(f)) return stbi_png_load_from_file(f,x,y,comp,req_comp); if (stbi_bmp_test_file(f)) return stbi_bmp_load_from_file(f,x,y,comp,req_comp); if (stbi_psd_test_file(f)) return stbi_psd_load_from_file(f,x,y,comp,req_comp); #ifndef STBI_NO_DDS if (stbi_dds_test_file(f)) return stbi_dds_load_from_file(f,x,y,comp,req_comp); #endif #ifndef STBI_NO_HDR if (stbi_hdr_test_file(f)) { float *hdr = stbi_hdr_load_from_file(f, x,y,comp,req_comp); return hdr_to_ldr(hdr, *x, *y, req_comp ? req_comp : *comp); } #endif for (i=0; i < max_loaders; ++i) if (loaders[i]->test_file(f)) return loaders[i]->load_from_file(f,x,y,comp,req_comp); // test tga last because it's a crappy test! if (stbi_tga_test_file(f)) return stbi_tga_load_from_file(f,x,y,comp,req_comp); return epuc("unknown image type", "Image not of any known type, or corrupt"); } #endif unsigned char *stbi_load_from_memory(stbi_uc const *buffer, int len, int *x, int *y, int *comp, int req_comp) { int i; if (stbi_jpeg_test_memory(buffer,len)) return stbi_jpeg_load_from_memory(buffer,len,x,y,comp,req_comp); if (stbi_png_test_memory(buffer,len)) return stbi_png_load_from_memory(buffer,len,x,y,comp,req_comp); if (stbi_bmp_test_memory(buffer,len)) return stbi_bmp_load_from_memory(buffer,len,x,y,comp,req_comp); if (stbi_psd_test_memory(buffer,len)) return stbi_psd_load_from_memory(buffer,len,x,y,comp,req_comp); #ifndef STBI_NO_DDS if (stbi_dds_test_memory(buffer,len)) return stbi_dds_load_from_memory(buffer,len,x,y,comp,req_comp); #endif #ifndef STBI_NO_HDR if (stbi_hdr_test_memory(buffer, len)) { float *hdr = stbi_hdr_loa