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51 lines
1.8 KiB
C
51 lines
1.8 KiB
C
#pragma once
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#include "base/basictypes.h"
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// LoadZIM's responsibility:
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// * Parse the ZIM format
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// * Extract all mip levels so they can be uploaded to GPU
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//
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// * NOT convert formats to anything, except converting ETC1 to RGBA8888 when running on the PC
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// ZIM format:
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// 4 byte ZIMG
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// 4 byte width
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// 4 byte height
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// 4 byte flags
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// Uncompressed or ZLibbed data. If multiple mips, zlibbed separately.
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// Defined flags:
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enum {
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ZIM_RGBA8888 = 0, // Assumed format if no other format is set
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ZIM_RGBA4444 = 1, // GL_UNSIGNED_SHORT_4_4_4_4
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ZIM_RGB565 = 2, // GL_UNSIGNED_SHORT_5_6_5
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ZIM_ETC1 = 3,
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ZIM_RGB888 = 4,
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ZIM_LUMINANCE_ALPHA = 5,
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ZIM_LUMINANCE = 6,
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ZIM_ALPHA = 7,
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// There's space for plenty more formats.
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ZIM_FORMAT_MASK = 15,
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ZIM_HAS_MIPS = 16, // If set, assumes that a full mip chain is present. Mips are zlib-compressed individually and stored in sequence. Always half sized.
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ZIM_GEN_MIPS = 32, // If set, the caller is advised to automatically generate mips. (maybe later, the ZIM lib will generate the mips for you).
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ZIM_DITHER = 64, // If set, dithers during save if color reduction is necessary.
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ZIM_CLAMP = 128, // Texture should default to clamp instead of wrap.
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ZIM_ZLIB_COMPRESSED = 256,
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ZIM_ETC1_LOW = 512,
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ZIM_ETC1_MEDIUM = 1024,
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ZIM_ETC1_HIGH = 0, // default
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ZIM_ETC1_DITHER = 2048,
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};
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// ZIM will only ever support up to 12 levels (4096x4096 max).
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enum {
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ZIM_MAX_MIP_LEVELS = 12,
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};
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// Delete the returned pointer using free()
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// Watch out! If the image has mipmaps, multiple values will be written
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// to width, height, and image, as if they were arrays, up to 12 (max texture size is 4096 which is 2^12).
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int LoadZIM(const char *filename, int *width, int *height, int *flags, uint8_t **image);
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int LoadZIMPtr(const uint8_t *zim, size_t datasize, int *width, int *height, int *flags, uint8_t **image); |