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https://github.com/scp-fs2open/fs2open.github.com.git
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Shivansps
fe18b474a9
* Initial KTX1/ETC2 support * Conditional glad include * remove unused function * define glenum for non opengl build * remove unused param * fix qtbuild * change ktx format to enum * use nullptr * ktx: support the same etc2 formats available in amd compressonator * add comments and missing include * correct flag type * clarify variable name for clang * cleanup * update glad loader to GL4.3
48 lines
1.3 KiB
C
48 lines
1.3 KiB
C
#pragma once
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#include "globalincs/pstypes.h"
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#include "cfile/cfile.h"
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// ETC2 types
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enum KTX_Format {
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KTX_ETC2_RGB = 100,
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KTX_ETC2_RGBA_EAC,
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KTX_ETC2_SRGB,
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KTX_ETC2_SRGBA_EAC,
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KTX_ETC2_RGB_A1,
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KTX_ETC2_SRGB_A1
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};
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enum KTX1_Error {
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KTX1_ERROR_NONE = 0,
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KTX1_ERROR_INVALID_FILENAME,
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KTX1_ERROR_BAD_HEADER,
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KTX1_ERROR_UNSUPPORTED,
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KTX1_ERROR_INVALID_FORMAT
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};
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struct KTX1_Header {
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uint8_t identifier[12];
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uint32_t endianness; // 0x04030201 little
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uint32_t glType;
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uint32_t glTypeSize;
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uint32_t glFormat;
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uint32_t glInternalFormat;
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uint32_t glBaseInternalFormat;
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uint32_t pixelWidth, pixelHeight, pixelDepth;
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uint32_t numberOfArrayElements;
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uint32_t numberOfFaces;
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uint32_t numberOfMipmapLevels;
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uint32_t bytesOfKeyValueData;
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};
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//reads a dds header and returns a KTX1_Error
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int ktx1_read_header(const char* filename, CFILE* img_cfp, int* w, int* h, int* bpp, int* c_type, int* mip_levels, size_t* total_size);
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//reads bitmap and returns a KTX1_Error
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int ktx1_read_bitmap(const char* filename, ubyte* dst, ubyte* out_bpp);
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//Get the GL enum type for this KTX format type, returns 0 if type is invalid.
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int ktx_map_ktx_format_to_gl_internal(const int ktx_format);
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//Get ktx block size (bytes per block) from GL internat format enum, returns 0 if internal format is invalid
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uint32_t ktx_etc_block_size(const int internal_format); |