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Initial KTX support;

This commit is contained in:
bjorn 2019-05-12 15:55:37 -07:00
parent 5b0fa8b522
commit c20554645e
2 changed files with 70 additions and 0 deletions
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51
src/data/textureData.c
View File

@ -133,6 +133,53 @@ static int parseDDS(uint8_t* data, size_t size, TextureData* textureData) {
return 0;
}
static int parseKTX(uint8_t* d, size_t size, TextureData* textureData) {
union {
uint8_t* u8;
uint32_t* u32;
KTXHeader* ktx;
} data = { .u8 = d };
uint8_t magic[] = { 0xAB, 0x4B, 0x54, 0x58, 0x20, 0x31, 0x31, 0xBB, 0x0D, 0x0A, 0x1A, 0x0A };
if (size < sizeof(magic) || memcmp(data.ktx->header, magic, sizeof(magic))) {
return 1;
}
if (data.ktx->endianness != 0x04030201 || data.ktx->numberOfArrayElements > 0 || data.ktx->numberOfFaces > 1 || data.ktx->pixelDepth > 1) {
return 1;
}
// TODO RGBA DXT1, SRGB DXT formats
switch (data.ktx->glInternalFormat) {
case 0x83F0: textureData->format = FORMAT_DXT1; break;
case 0x83F2: textureData->format = FORMAT_DXT3; break;
case 0x83F3: textureData->format = FORMAT_DXT5; break;
default: return 1;
}
uint32_t width = textureData->width = data.ktx->pixelWidth;
uint32_t height = textureData->height = data.ktx->pixelHeight;
uint32_t mipmapCount = data.ktx->numberOfMipmapLevels;
vec_reserve(&textureData->mipmaps, mipmapCount);
data.u8 += sizeof(KTXHeader) + data.ktx->bytesOfKeyValueData;
for (uint32_t i = 0; i < mipmapCount; i++) {
vec_push(&textureData->mipmaps, ((Mipmap) {
.width = width,
.height = height,
.data = data.u8 + sizeof(uint32_t),
.size = *data.u32
}));
width = MAX(width >> 1, 1u);
height = MAX(height >> 1, 1u);
data.u8 = (uint8_t*) ALIGN(data.u8 + sizeof(uint32_t) + *data.u32 + 3, 4);
}
return 0;
}
TextureData* lovrTextureDataInit(TextureData* textureData, int width, int height, uint8_t value, TextureFormat format) {
lovrAssert(width > 0 && height > 0, "TextureData dimensions must be positive");
lovrAssert(format != FORMAT_DXT1 && format != FORMAT_DXT3 && format != FORMAT_DXT5, "Blank TextureData cannot be compressed");
@ -156,6 +203,10 @@ TextureData* lovrTextureDataInitFromBlob(TextureData* textureData, Blob* blob, b
textureData->source = blob;
lovrRetain(blob);
return textureData;
} else if (!parseKTX(blob->data, blob->size, textureData)) {
textureData->source = blob;
lovrRetain(blob);
return textureData;
}
int length = (int) blob->size;

19
src/data/textureData.h
View File

@ -241,3 +241,22 @@ typedef struct DDSHeader10 {
uint32_t arraySize;
uint32_t reserved;
} DDSHeader10;
// KTX
typedef struct {
uint8_t header[12];
uint32_t endianness;
uint32_t glType;
uint32_t glTypeSize;
uint32_t glFormat;
uint32_t glInternalFormat;
uint32_t glBaseInternalFormat;
uint32_t pixelWidth;
uint32_t pixelHeight;
uint32_t pixelDepth;
uint32_t numberOfArrayElements;
uint32_t numberOfFaces;
uint32_t numberOfMipmapLevels;
uint32_t bytesOfKeyValueData;
} KTXHeader;