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zstd/contrib/single_file_decoder/examples/emscripten.c
Carl Woffenden 8ac29cc825 Correctness and tidy 
Test compilation performed with warnings. Author and license added. Test for failing grep on ancient OSX versions. Replaced the test image with something less noisy (which compresses better).
2019-09-02 18:02:50 +02:00

601 lines
27 KiB
C
Raw Blame History

/**
* \file emscripten.c
* Emscripten example of using the single-file \c zstddeclib. Draws a rotating
* textured quad with data from the in-line Zstd compressed DXT1 texture (DXT1
* being hardware compression, further compressed with Zstd).
* \n
* Compile using:
* \code
* export CC_FLAGS="-Wall -Wextra -Werror -Os -g0 -flto --llvm-lto 3 -lGL -DNDEBUG=1"
* export EM_FLAGS="-s WASM=1 -s ENVIRONMENT=web --shell-file shell.html --closure 1"
* emcc $CC_FLAGS $EM_FLAGS -o out.html emscripten.c
* \endcode
*
* \author Carl Woffenden, Numfum GmbH (released under a CC0 license)
*/
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <emscripten/emscripten.h>
#include <emscripten/html5.h>
#include <GLES2/gl2.h>
#include <GLES2/gl2ext.h>
#include "../zstddeclib.c"
//************************* Test Data (DXT texture) **************************/
/**
* Zstd compressed DXT1 256x256 texture source.
* \n
* See \c testcard.png for the original.
*/
static uint8_t const srcZstd[] = {
0x28, 0xb5, 0x2f, 0xfd, 0x60, 0x00, 0x7f, 0x6d, 0x61, 0x00, 0x0a, 0x66,
0xec, 0x17, 0x48, 0x60, 0x1c, 0x5a, 0xc9, 0x5d, 0x1a, 0x38, 0x07, 0xe8,
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0xc8, 0xd9, 0x0f, 0x46, 0x2d, 0x68, 0x11, 0xf8, 0x31, 0x10, 0xa1, 0x1a,
0x2f, 0x99, 0x5c, 0x84, 0xfd, 0x92, 0x02, 0xe6, 0x3b, 0x44, 0x9b, 0x01,
0x5d, 0x92, 0xff, 0x38, 0x26, 0x00, 0x6a, 0x6b, 0xc3, 0x53, 0xb2, 0x0c,
0x25, 0xf3, 0xd8, 0x59, 0x68, 0x9b, 0x14, 0x8a, 0x89, 0x75, 0x18, 0x03,
0x1d, 0xc9, 0x0f, 0x63, 0x01, 0x73, 0x01, 0x72, 0x01, 0x4f, 0x66, 0x31,
0x58, 0x0f, 0x97, 0x4b, 0x0c, 0x4c, 0x06, 0xac, 0x07, 0x0b, 0x68, 0xd4,
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0x5f, 0x0d, 0x26, 0x55, 0xd0, 0x9c, 0xf4, 0x52, 0x35, 0x2e, 0x20, 0xc1,
0x06, 0x69, 0x03, 0x0a, 0x93, 0x83, 0x5e, 0x27, 0x9b, 0x4c, 0x6d, 0xee,
0x87, 0x03, 0x30, 0x6c, 0x46, 0xd7, 0x50, 0x5c, 0xca, 0xe6, 0xa6, 0x4d,
0xa8, 0xf6, 0xab, 0xd7, 0x0e, 0x27, 0x27, 0x90, 0xc4, 0xb2, 0xd1, 0x10,
0xfa, 0x43, 0x82, 0xc8, 0xf2, 0xe5, 0xff, 0xff, 0xd5, 0x52, 0x62, 0x43,
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0x07, 0x70, 0xa7, 0x78, 0x38, 0x60, 0x87, 0x7a, 0x01, 0x3b, 0x75, 0xec,
0xfa, 0x77, 0xe2, 0x46, 0x94, 0x61, 0x8e, 0x0d, 0x0c, 0xfb, 0xe7, 0x8b,
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0xfb, 0x69, 0xfc, 0xfb, 0xfd, 0x7a, 0x10, 0x22, 0x36, 0xfc, 0xff, 0x3f,
0xcf, 0xd0, 0xf1, 0x7f, 0xfe, 0xff, 0x3d, 0x24, 0xdf, 0x78, 0x4a, 0xff,
0xda, 0x9c, 0x39, 0xcf, 0xef, 0xe7, 0xfd, 0x52, 0x98, 0xb5, 0x40, 0x92,
0xee, 0xdd, 0x99, 0xf5, 0x53, 0x5b, 0x65, 0x6b, 0xb5, 0xd8, 0x7b, 0xae,
0xfa, 0xc1, 0x0f, 0x0c, 0x7f, 0x4f, 0x55, 0xa3, 0xad, 0x2c, 0xa0, 0xbd,
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0xae, 0x60, 0xbc, 0xe8, 0xcf, 0xec, 0x3d, 0xde, 0xf9, 0xf0, 0xfe, 0xef,
0x7d, 0xcc, 0xf7, 0x2b, 0xe5, 0x1b, 0x70, 0xff, 0xff, 0x7e, 0x3f, 0x6e,
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0xdc, 0x97, 0xfd, 0x57, 0xef, 0xa3, 0xfc, 0x2a, 0xc7, 0x4d, 0xf3, 0xcb,
0x9d, 0xce, 0xac, 0xfe, 0xeb, 0x2e, 0x86, 0xb9, 0x69, 0x54, 0xef, 0xf9,
0x55, 0xcf, 0xff, 0x48, 0x24, 0x72, 0x3a, 0x9d, 0x72, 0x2f, 0x2f, 0x2f,
0xff, 0x3f, 0xe7, 0x01, 0x6c, 0x4d, 0x6c, 0xcd, 0x2d, 0x5b, 0x53, 0xb7,
0x59, 0x22, 0x08, 0x0b, 0xa7, 0x92, 0x15, 0x75, 0x93, 0xb0, 0x5d, 0xaf,
0x2a, 0x63, 0x95, 0x1d, 0x25, 0xd2, 0xd2, 0xa8, 0x1c, 0x84, 0xc9, 0xdc,
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0x2d, 0x3d, 0x6b, 0x4c, 0x26, 0x33, 0xda, 0x33, 0xf3, 0x91, 0x51, 0x46,
0x79, 0xbd, 0x3e, 0x39, 0x9f, 0xcf, 0xd2, 0xb8, 0x5c, 0xfa, 0x22, 0xf8,
0x8e, 0xb6, 0xbe, 0x08, 0x40, 0x14, 0x49, 0x40, 0x14, 0xf2, 0x0c, 0x2d,
0x30, 0x85, 0x3c, 0x63, 0x29, 0xd3, 0x98, 0x85, 0x6c, 0xb5, 0xdb, 0xad,
0x5c, 0x63, 0x9e, 0x72, 0xcf, 0x43, 0xe6, 0xaf, 0x77, 0xa6, 0xe2, 0x21,
0x0c, 0x4d, 0xd3, 0x49, 0x1e, 0xc2, 0x14, 0x6f, 0xee, 0xdb, 0x7b, 0x7b,
0x08, 0xb3, 0xa4, 0x60, 0x3b, 0x9d, 0x6e, 0x8b, 0x37, 0x4b, 0x0a, 0x74,
0x35, 0x33, 0xbc, 0xf9, 0x64, 0x85, 0x63, 0x32, 0x29, 0x20, 0x59, 0x0c,
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0xe1, 0x6c, 0xfc, 0x47, 0x75, 0x6c, 0x37, 0x63, 0x02, 0xf8, 0x34, 0x40,
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0xbb, 0x91, 0x5b, 0xbd, 0xe7, 0x58, 0x82, 0x4a, 0x20, 0xcd, 0x4f, 0x47,
0x15, 0xf3, 0x51, 0xf1, 0x43, 0x51, 0x10, 0x96, 0xae, 0xba, 0xf7, 0x21,
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0xb9, 0x53, 0xf7, 0x83, 0x73, 0x9d, 0xce, 0x86, 0x07, 0x83, 0x44, 0x61,
0x37, 0x35, 0x35, 0x33, 0x4e, 0x33, 0x33, 0x3e, 0x9f, 0x50, 0x48, 0x24,
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0x84, 0xff, 0x7a, 0x95, 0xbb, 0x00, 0x22, 0xcc, 0x14, 0x00, 0x04, 0xac,
0x60, 0x64, 0x86, 0xe4, 0x6f, 0xb1, 0x58, 0xf4, 0xdc, 0xb0, 0x05, 0x00,
0x72, 0x38, 0xf8, 0xce, 0xce, 0x8e, 0xcf, 0x37, 0x33, 0x43, 0x24, 0x0a,
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0xb5, 0x4a, 0x65, 0x94, 0x36, 0x89, 0xf5, 0x62, 0x9b, 0xd8, 0x9a, 0xe8,
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0xc4, 0x7e, 0x3c, 0x5b, 0x35, 0xd2, 0x7c, 0x2c, 0x0a, 0x82, 0xf2, 0xa8,
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0x40, 0xa0, 0x04, 0x40, 0x00, 0x80, 0x50, 0x03, 0x01, 0x10, 0x18, 0x01,
0x80, 0xd4, 0x14, 0x99, 0x01, 0xfd, 0x07, 0xf8, 0x16, 0x0e, 0xd9, 0x5d,
0xa3, 0x70, 0xfe, 0xda, 0x17, 0xfa, 0xce, 0x46, 0x9a, 0x99, 0x81, 0x1a,
0x39, 0xba, 0x63, 0xb1, 0x18, 0x11, 0x58, 0xd7, 0xc7, 0xba, 0x03, 0x3e,
0x01, 0xf2, 0xf9, 0x4e, 0x12, 0xa3, 0x50, 0x7b, 0xaf, 0x7b, 0x60, 0x5c,
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0x7a, 0x97, 0x43, 0xfc, 0xd1, 0x7e, 0x68, 0xed, 0x03, 0xb7, 0x1e, 0x75,
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0x1c, 0x05, 0xdf, 0x3f, 0x00, 0x86, 0x37, 0xa0, 0xfa, 0x0c, 0xe0, 0xed,
0x35, 0x35, 0x2f, 0xd8, 0xd1, 0x75, 0xba, 0x37, 0x34, 0x7e, 0xb0, 0x84,
0x2a, 0x01, 0x0c, 0x98, 0xed, 0x47, 0xf9, 0x86, 0x81, 0x74, 0x00, 0x5d,
0x8b, 0x4c, 0x18, 0x8a, 0x31, 0xcd, 0xae, 0x07, 0x44, 0xb5, 0xd5, 0x07,
0xa0, 0xdf, 0xf4, 0xfa, 0xa6, 0x42, 0xd0, 0x4f, 0x17, 0xd8, 0xdf, 0xb6,
0x34, 0x44, 0xe3, 0x01, 0xc4, 0xb6, 0x2d, 0xb5, 0x56, 0xc6, 0x2a, 0x1f,
0x05, 0x6c, 0x35, 0xe0, 0x09, 0x31, 0xef, 0x60, 0xfe, 0xaf, 0x07, 0x80,
0x32, 0xa0, 0xe9, 0xd3, 0x96, 0x45, 0xa7, 0xaa, 0xb6, 0xfb, 0x03, 0x10,
0xe3, 0x97, 0x96, 0x8d, 0x3a, 0x01, 0xdd, 0x58, 0x58, 0x78, 0x00, 0xab,
0xff, 0x06, 0xa0, 0xd6, 0x01, 0x58, 0x08, 0xb7, 0xdc, 0x2d, 0xa7, 0xfb,
0x22, 0xa8, 0x67, 0x00, 0xe3, 0xcf, 0x82, 0x43, 0xfc, 0x96, 0x1b, 0x40,
0x63, 0xcf, 0x9d, 0x42, 0x5d, 0x66, 0x40, 0xaa, 0xaf, 0x28, 0x94, 0xd3,
0x2a, 0xd4, 0x02, 0x13, 0xd2, 0xdf, 0x03, 0x9c, 0x60, 0x6b, 0x16, 0x94,
0xb4, 0xbe, 0x62, 0xc2, 0x35, 0x60, 0x45, 0x09, 0x23, 0x5a, 0xe0, 0x85,
0xb3, 0x03, 0x50, 0x68, 0x0c, 0x20, 0xa5, 0xf9, 0x94, 0xd2, 0x35, 0x80,
0xad, 0x4c, 0x4e, 0x40, 0x41, 0x97, 0x92, 0x75, 0xbe, 0x0c, 0x03, 0x50,
0x85, 0x08, 0xaf, 0x36, 0x00, 0x68, 0xaf, 0x09, 0xb3, 0x0c, 0x20, 0x4f,
0x81, 0x6a, 0x6a, 0xf5, 0x0d, 0x70, 0x69, 0x00, 0x4c, 0xb4, 0x0f, 0x59,
0xe7, 0x31, 0x0a, 0x45, 0x9f, 0xde, 0x90, 0xd6, 0x38, 0x80, 0x6b, 0x2c,
0xb9, 0x2f, 0xd4, 0x01, 0x40, 0x14, 0xd5, 0xed, 0x8e, 0x01, 0x53, 0xbf,
0x03, 0x18, 0x1e, 0xb0, 0xc1, 0x85, 0x32, 0xec, 0x78, 0x2b, 0xf0, 0xbb,
0xbb, 0x6c, 0xf3, 0x4d, 0xdc, 0x73, 0x40, 0xfd, 0x10, 0x09, 0x9e, 0x20,
0xe2, 0x12, 0x8c, 0xe0, 0xd2, 0xed, 0x80, 0x6b, 0xcc, 0x78, 0x20, 0x03,
0xd0, 0x5e, 0x06, 0xf4, 0xb0, 0xc4, 0x0e, 0x15, 0x1d, 0x80, 0xb4, 0x76,
0xdf, 0x49, 0x03, 0x50, 0x82, 0xad, 0xda, 0x8b, 0x5a, 0x61, 0xc2, 0x5e,
0xb5, 0x1e, 0x46, 0xc0, 0xde, 0xaa, 0x0e, 0x15, 0x06, 0xd2, 0xf4, 0xb2,
0xd1, 0xed, 0x38, 0x0a, 0x03, 0x18, 0x33, 0x1a, 0x80, 0x61, 0x3e, 0xec,
0x7c, 0x74, 0xa8, 0x1d, 0x80, 0x1a, 0xce, 0x25, 0x1d, 0x41, 0xd1, 0xc1,
0x03, 0x28, 0xb5, 0xaf, 0x72, 0x9c, 0x59, 0x7a, 0xe1, 0x7d, 0xc0, 0xa5,
0x08, 0x1e, 0x18, 0x24, 0xfa, 0xbd, 0x99, 0x4a, 0x31, 0xa0, 0xea, 0xee,
0xf8, 0x36, 0x60, 0x98, 0xc9, 0x10, 0xd1, 0xa7, 0x35, 0x00, 0x8d, 0x40,
0x8e, 0x5a, 0x35, 0x0f, 0x80, 0xb1, 0xd4, 0x32, 0x79, 0x40, 0x34, 0x05,
0x7e, 0x98, 0xc6, 0x80, 0x3e, 0x90, 0x01, 0x65, 0xf4, 0x80, 0x73, 0x08,
0x64, 0xd7, 0x36, 0xc1, 0x7c, 0xc0, 0x5c, 0x75, 0x00, 0xc5, 0x09, 0x58,
0x9c, 0x13, 0x01, 0x72, 0x37, 0x9b, 0x79, 0xe4, 0x05, 0xd1, 0x01, 0x04,
0x98, 0x08, 0x74, 0xfd, 0xfc, 0x3f, 0x1c, 0x00, 0x73, 0x01, 0xfc, 0x1c,
0xcc, 0x16, 0x43, 0x19, 0x1d, 0xac, 0x61, 0x4b, 0x11, 0xc2, 0xa0, 0xf2,
0x01, 0x0b, 0x7b, 0x3b, 0xf4, 0xfc, 0x58, 0x5d, 0x2d, 0x5c, 0x01, 0x8c,
0x62, 0x17, 0x78, 0xbe, 0x60, 0x8c, 0x01, 0x6f, 0x91, 0x49, 0x65, 0x54,
0x92, 0xe9, 0x01, 0x1e, 0x10, 0x77, 0x35, 0x00, 0xa8, 0xd4, 0xc7, 0x71,
0x07, 0xd8, 0xcd, 0xa3, 0x7d, 0x69, 0x20, 0xac, 0x07, 0x00, 0x35, 0xc7,
0x62, 0xee, 0x8c, 0x7d, 0x0c, 0xb8, 0x43, 0x0e, 0x00, 0x08, 0xfb, 0xe7,
0xec, 0x33, 0x37, 0x04, 0x80, 0x2d, 0x1d, 0xa6, 0x13, 0x34, 0x1b, 0x1d,
0xc0, 0xca, 0x00, 0x92, 0xed, 0x2e, 0x56, 0xbe, 0x91, 0x80, 0x0c, 0x88,
0xa6, 0x01, 0xdf, 0x7f, 0x90, 0x49, 0xed, 0x0c, 0xe0, 0x08, 0x73, 0x28,
0x74, 0xc7, 0xe1, 0xb1, 0x03, 0x5d, 0xc5, 0xab, 0x61, 0x42, 0xdf, 0x03,
0x43, 0xf3, 0x35, 0x04, 0xcf, 0xc6, 0x1d, 0x79, 0x07, 0x40, 0x22, 0xe4,
0x68, 0x0d, 0x01, 0x95, 0xad, 0x72, 0x69, 0x00, 0x39, 0x9d, 0x53, 0x8f,
0x13, 0x0d, 0xb0, 0x29, 0x79, 0x1a, 0x39, 0x20, 0x12, 0x28, 0x9b, 0x02,
0x8f, 0x74, 0x90, 0x4c, 0xe8, 0xd1, 0x57, 0xf4, 0x01, 0x44, 0x04, 0xe0,
0x0c, 0x82, 0x91, 0xc5, 0x4f, 0x8f, 0xc6, 0x00, 0x43, 0x85, 0x65, 0xc8,
0xe6, 0x34, 0x1d, 0x80, 0xc0, 0xca, 0xdb, 0x57, 0x6c, 0x00, 0x72, 0x42,
0x5f, 0xd0, 0x49, 0x57, 0x47, 0xd4, 0x97, 0x18, 0x18, 0x80, 0x68, 0x8e,
0x0a, 0xf1, 0x6b, 0x34, 0xf1, 0x60, 0x2c, 0x41, 0x29, 0xd3, 0x3d, 0x55,
0x95, 0xb1, 0x3c, 0xd4, 0x95, 0x42, 0xef, 0xe7, 0xca, 0x00, 0x2e, 0xce,
0x25, 0xc2, 0xca, 0xf5, 0x00, 0x17, 0x3b, 0x8c, 0x42, 0x88, 0x03, 0xde,
0x97, 0xe1, 0x3a, 0x74, 0xb0, 0x33, 0xe0, 0x8f, 0x47, 0xeb, 0x2a, 0x5f,
0x36, 0x3e, 0x5a, 0xff, 0xc5, 0x80, 0xb9, 0x13, 0xa9, 0x1f, 0xf8, 0x86,
0xc9, 0x51, 0xf8, 0x4c, 0xaa, 0xe1, 0x65, 0x80, 0xb0, 0x8b, 0x91, 0xec,
0xcc, 0xbf, 0x70, 0x19, 0x98, 0x03, 0x10, 0xf0, 0x38, 0x40, 0xc4, 0x65,
0xbe, 0x41, 0xb2, 0x58, 0x3f, 0xe0, 0xcc, 0x0e, 0x08, 0x2b, 0x73, 0xf4,
0xdd, 0x86, 0x06, 0xa0, 0xc6, 0x8f, 0x1a, 0x32, 0x66, 0x50, 0x8e, 0xe1,
0x59, 0x67, 0x00, 0xed, 0x66, 0x1d, 0xdd, 0xfa, 0x7b, 0xe2, 0x56, 0x89,
0xd9, 0xa0, 0x4f, 0x41, 0x94, 0x28, 0xb8, 0xc6, 0xc7, 0x64, 0xde, 0x9b,
0x64, 0x44, 0x33, 0x39, 0xb5, 0x6c, 0xb9, 0x42, 0xe7, 0x7e, 0x16, 0xd2,
0x01, 0x12, 0x03, 0xb3, 0x48, 0x47, 0x6b, 0x75, 0x26, 0x19, 0x8c, 0xac,
0x6f, 0xb1, 0x6f, 0xdc, 0x04, 0x27, 0x3a, 0x00, 0xd6, 0xae, 0xfa, 0xe1,
0xf7, 0x30, 0xa4, 0xdb, 0xd5, 0x86, 0x5a, 0x07, 0x11, 0xde, 0xea, 0xf4,
0xb0, 0x83, 0x16, 0xbb, 0xc6, 0x00, 0x6e, 0xf2, 0x6b, 0x40, 0x81, 0x01,
0x67, 0x0e, 0xa9, 0x82, 0x23, 0x04, 0x34, 0xed, 0x02, 0xf5, 0xe4, 0x0e,
0x58, 0xe8, 0x8a, 0x58, 0x57, 0xb0, 0x56, 0x65, 0x3d, 0x40, 0x64, 0x03,
0x6e, 0x7b, 0x07, 0x20, 0x99, 0x90, 0x36, 0x95, 0x9f, 0xdf, 0x3d, 0xe8,
0x00, 0xa0, 0x57, 0x8f, 0x6d, 0xa4, 0xb3, 0x1d, 0x7a, 0x06, 0xa8, 0x26,
0x41, 0xb0, 0x8c, 0x9c, 0x10, 0x85, 0x6c, 0xb4, 0x31, 0xa6, 0x5b, 0x7a,
0x10, 0x51, 0x15, 0x3c, 0xa2, 0x42, 0xd3, 0x23, 0x02, 0xc0, 0x17, 0x7e,
0x03, 0x28, 0xba, 0xce, 0x9b, 0xae, 0xdd, 0x1a, 0x19, 0xd0, 0x15, 0xac,
0xeb, 0x20, 0x3c, 0x3a, 0x00, 0xc6, 0xbb, 0x8a, 0xd5, 0x64, 0xc2, 0x21,
0x1d, 0x6c, 0x15, 0x5a, 0xd3, 0x44, 0x98, 0x14, 0x95, 0xb3, 0xb7, 0xdd,
0xa6, 0xea, 0x06, 0x54, 0x78, 0xc3, 0xe8, 0x79, 0x9b, 0x86, 0x29, 0x76,
0x8b, 0x6b, 0xaa, 0x0d, 0xa8, 0x2f, 0x22, 0x2a, 0xeb, 0x68, 0x81, 0x6c,
0x56, 0xfd, 0x79, 0xac, 0x79, 0x4b, 0xa0, 0x01, 0x3f, 0x17, 0x43, 0x82,
0xb4, 0xd5, 0x00, 0x14, 0xb7, 0xf5, 0x00, 0xf4, 0x15, 0xa8, 0xd7, 0x4b,
0xb1, 0xbc, 0xa8, 0x36, 0x98, 0xf0, 0x8c, 0xe7, 0xf4, 0x7b, 0x35, 0xd8,
0xad, 0x0d, 0x5f, 0x9d, 0x96, 0xab, 0xed, 0x48, 0xe2, 0xdc, 0x1c, 0xbe,
0x12, 0xfa, 0x41, 0x6f, 0xf5, 0x1e, 0xb6, 0x9f, 0xee, 0xac, 0x21, 0xf4,
0xf6, 0x00, 0x38, 0xb1, 0x1f, 0xfd, 0xd0, 0x0e, 0xc7, 0xdd, 0xa0, 0x39,
0x07, 0x8c, 0x35, 0x1f, 0x7e, 0xcc, 0xbf, 0xf6, 0xe0, 0x06, 0x66, 0x7d,
0x10, 0x3f, 0xc5, 0x3e, 0xde, 0x42, 0xf9, 0x3d, 0x00, 0x54, 0x81, 0x67,
0x8a, 0xe6, 0x63, 0x0d, 0x01, 0xd0, 0x31, 0xe0, 0x6e, 0xd0, 0xe1, 0x59,
0xf6, 0x1b, 0xf7, 0x0d, 0x52, 0x06, 0x80, 0x61, 0x4f, 0xe8, 0x77, 0xdd,
0x6f, 0x48, 0x20, 0x1d, 0xbb, 0x2a, 0x16, 0x8b, 0x54, 0x87, 0x92, 0x83,
0xe6, 0x8f, 0x55, 0x59, 0x06, 0x00, 0xe9, 0xc5, 0xce, 0x21, 0x63, 0x87,
0xaf, 0x86, 0xcc, 0xba, 0xd6, 0xe7, 0x00, 0xf6, 0x91, 0x92, 0x92, 0xea,
0xe8, 0x42, 0x06, 0x69, 0x13, 0xf5, 0x00, 0xd0, 0xb0, 0xa7, 0xcb, 0x4c,
0xb0, 0xd2, 0x2d, 0x28, 0x63, 0xf0, 0x6a, 0xc7, 0x80, 0x6a, 0x19, 0xb2,
0x66, 0x51, 0xf3, 0xb1, 0x21, 0xa0, 0x48, 0xad, 0x1e, 0x80, 0x62, 0xaf,
0x00, 0xf4, 0xa5, 0x4e, 0x83, 0x75, 0x1b, 0xfe, 0x00, 0xc4, 0xcf, 0x55,
0xb2, 0x50, 0xa6, 0xeb, 0x38, 0xed, 0x8f, 0xd3, 0x1d, 0x00, 0xf6, 0xe3,
0x90, 0x1c, 0x60, 0x9e, 0x8e, 0xeb, 0x0b, 0xba, 0x44, 0x06, 0x68, 0xbb,
0xd3, 0x10, 0x63, 0x35, 0xe1, 0x86, 0x5c, 0x5c, 0x2b, 0x85, 0xa6, 0xe7,
0x38, 0x2c, 0x18, 0x83, 0x1f, 0x8f, 0x9b, 0x8e, 0x4d, 0x26, 0xcd, 0x34,
0x0c, 0x66, 0x1d, 0x70, 0xb7, 0x01, 0xe6, 0x02, 0xa8, 0x51, 0x63, 0xcf,
0xbb, 0x03, 0xca, 0x85, 0xc6, 0x9c, 0xf6, 0xf1, 0x51, 0xe0, 0x60, 0x07,
0x40, 0x86, 0xf0, 0x1e, 0x6e, 0xef, 0x61, 0x10, 0xd9, 0x36, 0xcc, 0xfc,
0x58, 0xe2, 0x37, 0x0d, 0x58, 0xb7, 0xbe, 0xca, 0xc9, 0xd8, 0xcd, 0xaa,
0xd5, 0x5b, 0x77, 0x83, 0xcb, 0x0e, 0x30, 0xce, 0xc8, 0xb8, 0xcd, 0xbf,
0x1e, 0x63, 0x04, 0xad, 0xb7, 0xcd, 0x43, 0x62, 0x4c, 0xe0, 0x1a, 0xd4,
0x21, 0xe2, 0xdd, 0x33, 0xdf, 0xb1, 0xdd, 0xdc, 0x01, 0x22, 0x18, 0xce,
0xa1, 0xd8, 0xcb, 0x67, 0xd5, 0x38, 0x4a, 0xbc, 0xd5, 0x81, 0x3d, 0x03,
0x98, 0x35, 0x60, 0x41, 0x85, 0x0c, 0x1d, 0xe7, 0x76, 0xf8, 0x11, 0x52,
0x76, 0xf6, 0x06, 0x16, 0x02, 0x45, 0xc8, 0xd8, 0x2f, 0x5e, 0x57, 0xbc,
0x3b, 0x89, 0x97, 0x09, 0x3e, 0x03, 0x34, 0x1a, 0x9d, 0x37, 0x87, 0x48,
0x0a, 0xe0, 0xa7, 0x4f, 0x8c, 0x3a, 0xa2, 0xaf, 0xfd, 0x7b, 0x80, 0xcf,
0xe5, 0x18, 0x61, 0x68, 0xba, 0x61, 0x8b, 0x09, 0xaa, 0xa3, 0x0c, 0x47,
0x3c, 0x43, 0x03, 0xac, 0xa3, 0x2e, 0x5e, 0x72, 0x0c, 0x80, 0x19, 0x61,
0xe6, 0x6e, 0x0e, 0xd9, 0xe8, 0xe8, 0xaf, 0x11, 0x9b, 0x4a, 0x73, 0x7a,
0x61, 0x66, 0xf0, 0x54, 0x1d, 0x18, 0xc8, 0x23, 0x36, 0xbf, 0xb5, 0xf4,
0x86, 0x54, 0xed, 0xb5, 0x91, 0xee, 0xb8, 0xbc, 0xde, 0xc3, 0x87, 0x9b,
0x2f, 0x81, 0xf2, 0xee, 0xa3, 0xec, 0x02
};
/**
* Uncompressed size of \c #srcZstd.
*/
#define DXT1_256x256 32768
/**
* Destination for decoding \c #srcZstd.
*/
static uint8_t dstDxt1[DXT1_256x256] = {};
#ifndef ZSTD_VERSION_MAJOR
/**
* For the case where the decompression library hasn't been included we add a
* dummy function to fake the process and stop the buffers being optimised out.
*/
size_t ZSTD_decompress(void* dst, size_t dstLen, const void* src, size_t srcLen) {
return (memcmp(dst, src, (srcLen < dstLen) ? srcLen : dstLen)) ? dstLen : 0;
}
#endif
//*************************** Program and Shaders ***************************/
/**
* Program object ID.
*/
static GLuint progId = 0;
/**
* Vertex shader ID.
*/
static GLuint vertId = 0;
/**
* Fragment shader ID.
*/
static GLuint fragId = 0;
//********************************* Uniforms *********************************/
/**
* Quad rotation angle ID.
*/
static GLint uRotId = -1;
/**
* Draw colour ID.
*/
static GLint uTx0Id = -1;
//******************************* Shader Source ******************************/
/**
* Vertex shader to draw texture mapped polys with an applied rotation.
*/
static GLchar const vertShader2D[] =
#if GL_ES_VERSION_2_0
"#version 100\n"
"precision mediump float;\n"
#else
"#version 120\n"
#endif
"uniform float uRot;" // rotation
"attribute vec2 aPos;" // vertex position coords
"attribute vec2 aUV0;" // vertex texture UV0
"varying vec2 vUV0;" // (passed to fragment shader)
"void main() {"
" float cosA = cos(radians(uRot));"
" float sinA = sin(radians(uRot));"
" mat3 rot = mat3(cosA, -sinA, 0.0,"
" sinA, cosA, 0.0,"
" 0.0, 0.0, 1.0);"
" gl_Position = vec4(rot * vec3(aPos, 1.0), 1.0);"
" vUV0 = aUV0;"
"}";
/**
* Fragment shader for the above polys.
*/
static GLchar const fragShader2D[] =
#if GL_ES_VERSION_2_0
"#version 100\n"
"precision mediump float;\n"
#else
"#version 120\n"
#endif
"uniform sampler2D uTx0;"
"varying vec2 vUV0;" // (passed from fragment shader)
"void main() {"
" gl_FragColor = texture2D(uTx0, vUV0);"
"}";
/**
* Helper to compile a shader.
*
* \param type shader type
* \param text shader source
* \return the shader ID (or zero if compilation failed)
*/
static GLuint compileShader(GLenum const type, const GLchar* text) {
GLuint shader = glCreateShader(type);
if (shader) {
glShaderSource (shader, 1, &text, NULL);
glCompileShader(shader);
GLint compiled;
glGetShaderiv(shader, GL_COMPILE_STATUS, &compiled);
if (compiled) {
return shader;
} else {
GLint logLen;
glGetShaderiv(shader, GL_INFO_LOG_LENGTH, &logLen);
if (logLen > 1) {
GLchar* logStr = malloc(logLen);
glGetShaderInfoLog(shader, logLen, NULL, logStr);
#ifndef NDEBUG
printf("Shader compilation error: %s\n", logStr);
#endif
free(logStr);
}
glDeleteShader(shader);
}
}
return 0;
}
//********************************** Helpers *********************************/
/**
* Vertex position index.
*/
#define GL_VERT_POSXY_ID 0
/**
* Vertex UV0 index.
*/
#define GL_VERT_TXUV0_ID 1
/**
* \c GL vec2 storage type.
*/
struct vec2 {
float x;
float y;
};
/**
* Combined 2D vertex and 2D texture coordinates.
*/
struct posTex2d {
struct vec2 pos;
struct vec2 uv0;
};
//****************************************************************************/
/**
* Current quad rotation angle (in degrees, updated per frame).
*/
static float rotDeg = 0.0f;
/**
* Emscripten (single) GL context.
*/
static EMSCRIPTEN_WEBGL_CONTEXT_HANDLE glCtx = 0;
/**
* Emscripten resize handler.
*/
static EM_BOOL resize(int type, const EmscriptenUiEvent* e, void* data) {
double surfaceW;
double surfaceH;
if (emscripten_get_element_css_size ("#canvas", &surfaceW, &surfaceH) == EMSCRIPTEN_RESULT_SUCCESS) {
emscripten_set_canvas_element_size("#canvas", surfaceW, surfaceH);
if (glCtx) {
glViewport(0, 0, (int) surfaceW, (int) surfaceH);
}
}
(void) type;
(void) data;
(void) e;
return EM_FALSE;
}
/**
* Boilerplate to create a WebGL context.
*/
static EM_BOOL initContext() {
// Default attributes
EmscriptenWebGLContextAttributes attr;
emscripten_webgl_init_context_attributes(&attr);
if ((glCtx = emscripten_webgl_create_context("#canvas", &attr))) {
// Bind the context and fire a resize to get the initial size
emscripten_webgl_make_context_current(glCtx);
emscripten_set_resize_callback(EMSCRIPTEN_EVENT_TARGET_DOCUMENT, NULL, EM_FALSE, resize);
resize(0, NULL, NULL);
return EM_TRUE;
}
return EM_FALSE;
}
/**
* Called once per frame (clears the screen and draws the rotating quad).
*/
static void tick() {
glClearColor(1.0f, 0.0f, 1.0f, 1.0f);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
if (uRotId >= 0) {
glUniform1f(uRotId, rotDeg);
rotDeg += 0.1f;
if (rotDeg >= 360.0f) {
rotDeg -= 360.0f;
}
}
glDrawElements(GL_TRIANGLES, 6, GL_UNSIGNED_SHORT, 0);
glFlush();
}
/**
* Creates the GL context, shaders and quad data, decompresses the Zstd data
* and 'uploads' the resulting texture.
*
* As a (naive) comparison, removing Zstd and building with "-Os -g0 s WASM=1
* -lGL emscripten.c" results in a 15kB WebAssembly file; re-adding Zstd
* increases the Wasm by 26kB.
*/
int main() {
if (initContext()) {
// Compile shaders and set the initial GL state
if ((progId = glCreateProgram())) {
vertId = compileShader(GL_VERTEX_SHADER, vertShader2D);
fragId = compileShader(GL_FRAGMENT_SHADER, fragShader2D);
glBindAttribLocation(progId, GL_VERT_POSXY_ID, "aPos");
glBindAttribLocation(progId, GL_VERT_TXUV0_ID, "aUV0");
glAttachShader(progId, vertId);
glAttachShader(progId, fragId);
glLinkProgram (progId);
glUseProgram (progId);
uRotId = glGetUniformLocation(progId, "uRot");
uTx0Id = glGetUniformLocation(progId, "uTx0");
if (uTx0Id >= 0) {
glUniform1i(uTx0Id, 0);
}
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
glEnable(GL_BLEND);
glDisable(GL_DITHER);
glCullFace(GL_BACK);
glEnable(GL_CULL_FACE);
}
GLuint vertsBuf = 0;
GLuint indexBuf = 0;
GLuint txName = 0;
// Create the textured quad (vert positions then UVs)
struct posTex2d verts2d[] = {
{{-0.85f, -0.85f}, {0.0f, 0.0f}}, // BL
{{ 0.85f, -0.85f}, {1.0f, 0.0f}}, // BR
{{-0.85f, 0.85f}, {0.0f, 1.0f}}, // TL
{{ 0.85f, 0.85f}, {1.0f, 1.0f}}, // TR
};
uint16_t index2d[] = {
0, 1, 2,
2, 1, 3,
};
glGenBuffers(1, &vertsBuf);
glBindBuffer(GL_ARRAY_BUFFER, vertsBuf);
glBufferData(GL_ARRAY_BUFFER,
sizeof(verts2d), verts2d, GL_STATIC_DRAW);
glVertexAttribPointer(GL_VERT_POSXY_ID, 2,
GL_FLOAT, GL_FALSE, sizeof(struct posTex2d), 0);
glVertexAttribPointer(GL_VERT_TXUV0_ID, 2,
GL_FLOAT, GL_FALSE, sizeof(struct posTex2d),
(void*) offsetof(struct posTex2d, uv0));
glGenBuffers(1, &indexBuf);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, indexBuf);
glBufferData(GL_ELEMENT_ARRAY_BUFFER,
sizeof(index2d), index2d, GL_STATIC_DRAW);
glEnableVertexAttribArray(GL_VERT_POSXY_ID);
glEnableVertexAttribArray(GL_VERT_TXUV0_ID);
// Decode the Zstd data and create the texture
if (ZSTD_decompress(dstDxt1, DXT1_256x256, srcZstd, sizeof srcZstd) == DXT1_256x256) {
glGenTextures(1, &txName);
glBindTexture(GL_TEXTURE_2D, txName);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glCompressedTexImage2D(GL_TEXTURE_2D, 0,
GL_COMPRESSED_RGB_S3TC_DXT1_EXT,
256, 256, 0, DXT1_256x256, dstDxt1);
} else {
printf("Failed to decode Zstd data\n");
}
emscripten_set_main_loop(tick, 0, EM_FALSE);
emscripten_exit_with_live_runtime();
}
return EXIT_FAILURE;
}
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