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feat(texture): implemented TextureLoadImage API, also support loading and mipping TGA files

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This commit is contained in:
phaneron 2024-09-06 12:31:08 -04:00
parent 3425aefc73
commit c6e1751bbe
7 changed files with 1336 additions and 90 deletions
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100
src/gx/texture/CTgaFile.hpp Normal file
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#ifndef GX_TEXTURE_C_TGA_FILE_HPP
#define GX_TEXTURE_C_TGA_FILE_HPP
#include <cstdint>
#include "util/SFile.hpp"
class CTgaFile {
private:
enum {
TGA_NO_IMAGE_DATA = 0x0,
TGA_COLOR_MAPPED = 0x1,
TGA_TRUE_COLOR = 0x2,
TGA_BLACK_N_WHITE = 0x3,
TGA_RLE_COLOR_MAPPED = 0x9,
TGA_RLE_TRUE_COLOR = 0xA,
TGA_RLE_BLACK_N_WHITE = 0xB
};
// This class casts raw memory into these structures, so pack them tightly
#pragma pack(push, 1)
struct TGAHeader {
uint8_t bIDLength;
uint8_t bColorMapType;
uint8_t bImageType;
// byte packed
uint16_t wColorMapStartIndex;
uint16_t wColorMapEntries;
uint8_t bColorMapEntrySize;
uint16_t wXOrigin;
uint16_t wYOrigin;
uint16_t wWidth;
uint16_t wHeight;
uint8_t bPixelDepth;
union {
uint8_t bImageDescriptor;
struct {
uint8_t bAlphaChannelBits : 4;
uint8_t bLeftRightOrder : 1;
uint8_t bTopBottomOrder : 1;
uint8_t bReserved : 2;
} desc;
};
};
struct TGAFooter {
uint32_t dwExtensionOffset;
uint32_t dwDeveloperOffset;
uint8_t szSigniture[18];
};
#pragma pack(pop)
SFile* m_file = nullptr;
uint8_t* m_image = nullptr;
TGAHeader m_header;
uint8_t* m_addlHeaderData = nullptr;
TGAFooter m_footer;
uint32_t m_imageBytes = 0;
uint8_t* m_colorMap = nullptr;
private:
void AddAlphaChannel(uint8_t* pAlphaData, uint8_t* pNoAlphaData, const uint8_t* alpha);
int32_t RemoveAlphaChannels();
int32_t ReadRawImage(uint32_t flags);
int32_t RLEDecompressImage(uint8_t* pRLEData, uint8_t* pData);
int32_t ReadRleImage(uint32_t flags);
int32_t ReadColorMappedImage(uint32_t flags);
int32_t ValidateColorDepth();
void ConvertColorMapped(uint32_t flags);
uint32_t PreImageBytes() const;
uint32_t ColorMapEntryBytes() const;
uint32_t ColorMapEntries() const;
uint32_t ColorMapBytes() const;
uint32_t BytesPerPixel() const;
// int32_t CountRun(uint8_t* pImage ,int32_t nMax);
// int32_t RleCompressLine(uint8_t** uncompressed, uint8_t** compressed);
public:
struct TGA32Pixel {
uint8_t b;
uint8_t g;
uint8_t r;
uint8_t a;
};
int32_t Open(const char* filename, int32_t a3);
void Close();
uint32_t Width() const;
uint32_t Height() const;
uint32_t Size() const;
uint32_t Bytes() const;
uint8_t AlphaBits() const;
uint8_t* Image();
TGA32Pixel* ImageTGA32Pixel();
int32_t LoadImageData(uint32_t flags);
int32_t AddAlphaChannel(const void* pImg);
void SetTopDown(int32_t set);
};
#endif