janwas
71f7fccd12
tex.cpp now has loader API and codec support routines. provide for codecs "transforming" the image; this allows e.g. decompressing DDS, which is currently done in ogl code (but belongs here) This was SVN commit r2648.
310 lines
8.9 KiB
C++
310 lines
8.9 KiB
C++
#include "precompiled.h"
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#include "lib/byte_order.h"
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#include "tex_codec.h"
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// NOTE: the convention is bottom-up for DDS, but there's no way to tell.
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// defs modified from ddraw header
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#pragma pack(push, 1)
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// DDPIXELFORMAT.dwFlags
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#define DDPF_ALPHAPIXELS 0x00000001
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typedef struct
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{
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u32 dwSize; // size of structure (32)
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u32 dwFlags; // indicates which fields are valid
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u32 dwFourCC; // (DDPF_FOURCC) FOURCC code, "DXTn"
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u32 dwReserved1[5]; // reserved
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}
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DDPIXELFORMAT;
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typedef struct
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{
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u32 dwCaps[4];
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}
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DDSCAPS2;
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// DDSURFACEDESC2.dwFlags
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#define DDSD_HEIGHT 0x00000002
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#define DDSD_WIDTH 0x00000004
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#define DDSD_PIXELFORMAT 0x00001000
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#define DDSD_MIPMAPCOUNT 0x00020000
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typedef struct
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{
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u32 dwSize; // size of structure (124)
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u32 dwFlags; // indicates which fields are valid
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u32 dwHeight; // height of main image (pixels)
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u32 dwWidth; // width of main image (pixels)
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u32 dwLinearSize; // (DDSD_LINEARSIZE): total image size
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u32 dwDepth; // (DDSD_DEPTH) vol. textures: vol. depth
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u32 dwMipMapCount; // (DDSD_MIPMAPCOUNT) total # levels
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u32 dwReserved1[11]; // reserved
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DDPIXELFORMAT ddpfPixelFormat; // pixel format description of the surface
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DDSCAPS2 ddsCaps; // direct draw surface capabilities
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u32 dwReserved2; // reserved
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}
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DDSURFACEDESC2;
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#pragma pack(pop)
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static int dds_decompress(Tex* t)
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{
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uint w = t->w, h = t->h;
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if(w==0 || h==0 || w%4 || h%4)
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return ERR_TEX_FMT_INVALID;
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int dxt = t->flags & TEX_DXT;
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debug_assert(dxt == 1 || dxt == 3 || dxt == 5);
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u8* data = tex_get_data(t);
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/*
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GLsizei blocks_w = (GLsizei)(round_up(w, 4) / 4);
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GLsizei blocks_h = (GLsizei)(round_up(h, 4) / 4);
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GLsizei blocks = blocks_w * blocks_h;
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GLsizei size = blocks * 16 * (base_fmt == GL_RGB ? 3 : 4);
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GLsizei pitch = size / (blocks_h*4);
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UNUSED2(pitch);
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void* rgb_data = malloc(size);
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debug_assert(imageSize == blocks * (dxt1? 8 : 16));
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// This code is inefficient, but I don't care:
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for(GLsizei block_y = 0; block_y < blocks_h; ++block_y)
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for(GLsizei block_x = 0; block_x < blocks_w; ++block_x)
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{
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int c0_a = 255, c1_a = 255, c2_a = 255, c3_a = 255;
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u8* alpha = NULL;
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u8 dxt5alpha[8];
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if(!dxt1)
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{
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alpha = (u8*)data;
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data = (char*)data + 8;
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if(dxt5)
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{
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dxt5alpha[0] = alpha[0];
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dxt5alpha[1] = alpha[1];
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if(alpha[0] > alpha[1])
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{
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dxt5alpha[2] = (6*alpha[0] + 1*alpha[1] + 3)/7;
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dxt5alpha[3] = (5*alpha[0] + 2*alpha[1] + 3)/7;
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dxt5alpha[4] = (4*alpha[0] + 3*alpha[1] + 3)/7;
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dxt5alpha[5] = (3*alpha[0] + 4*alpha[1] + 3)/7;
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dxt5alpha[6] = (2*alpha[0] + 5*alpha[1] + 3)/7;
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dxt5alpha[7] = (1*alpha[0] + 6*alpha[1] + 3)/7;
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}
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else
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{
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dxt5alpha[2] = (4*alpha[0] + 1*alpha[1] + 2)/5;
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dxt5alpha[3] = (3*alpha[0] + 2*alpha[1] + 2)/5;
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dxt5alpha[4] = (2*alpha[0] + 3*alpha[1] + 2)/5;
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dxt5alpha[5] = (1*alpha[0] + 4*alpha[1] + 2)/5;
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dxt5alpha[6] = 0;
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dxt5alpha[7] = 255;
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}
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}
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}
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u16 c0 = *(u16*)( (char*)data + 0 );
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u16 c1 = *(u16*)( (char*)data + 2 );
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u32 bits = *(u32*)( (char*)data + 4 );
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data = (char*)data + 8;
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// Unpack 565, and copy high bits to low bits
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int c0_r = ((c0>>8)&0xF8) | ((c0>>13)&7);
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int c1_r = ((c1>>8)&0xF8) | ((c1>>13)&7);
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int c0_g = ((c0>>3)&0xFC) | ((c0>>9 )&3);
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int c1_g = ((c1>>3)&0xFC) | ((c1>>9 )&3);
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int c0_b = ((c0<<3)&0xF8) | ((c0>>2 )&7);
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int c1_b = ((c1<<3)&0xF8) | ((c1>>2 )&7);
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int c2_r, c2_g, c2_b;
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int c3_r, c3_g, c3_b;
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if(!dxt1 || c0 > c1)
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{
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c2_r = (c0_r*2+c1_r+1)/3; c2_g = (c0_g*2+c1_g+1)/3; c2_b = (c0_b*2+c1_b+1)/3;
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c3_r = (c0_r+2*c1_r+1)/3; c3_g = (c0_g+2*c1_g+1)/3; c3_b = (c0_b+2*c1_b+1)/3;
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}
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else
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{
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c2_r = (c0_r+c1_r)/2; c2_g = (c0_g+c1_g)/2; c2_b = (c0_b+c1_b)/2;
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c3_r = c3_g = c3_b = c3_a = 0;
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}
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if(base_fmt == GL_RGB)
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{
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int i = 0;
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for(int y = 0; y < 4; ++y)
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{
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u8* out = (u8*)rgb_data + ((block_y*4+y)*blocks_w*4 + block_x*4) * 3;
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for(int x = 0; x < 4; ++x, ++i)
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{
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switch((bits >> (2*i)) & 3) {
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case 0: *out++ = c0_r; *out++ = c0_g; *out++ = c0_b; break;
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case 1: *out++ = c1_r; *out++ = c1_g; *out++ = c1_b; break;
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case 2: *out++ = c2_r; *out++ = c2_g; *out++ = c2_b; break;
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case 3: *out++ = c3_r; *out++ = c3_g; *out++ = c3_b; break;
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}
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}
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}
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}
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else
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{
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int i = 0;
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for(int y = 0; y < 4; ++y)
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{
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u8* out = (u8*)rgb_data + ((block_y*4+y)*blocks_w*4 + block_x*4) * 4;
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for(int x = 0; x < 4; ++x, ++i)
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{
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int a = 0; // squelch bogus uninitialized warning
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switch((bits >> (2*i)) & 3) {
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case 0: *out++ = c0_r; *out++ = c0_g; *out++ = c0_b; a = c0_a; break;
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case 1: *out++ = c1_r; *out++ = c1_g; *out++ = c1_b; a = c1_a; break;
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case 2: *out++ = c2_r; *out++ = c2_g; *out++ = c2_b; a = c2_a; break;
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case 3: *out++ = c3_r; *out++ = c3_g; *out++ = c3_b; a = c3_a; break;
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}
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if(dxt3)
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{
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a = (int)((*(u64*)alpha >> (4*i)) & 0xF);
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a |= a<<4; // copy low bits to high bits
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}
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else if(dxt5)
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{
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a = dxt5alpha[(*(u64*)(alpha+2) >> (3*i)) & 0x7];
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}
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*out++ = a;
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}
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}
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}
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}
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*/
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return 0;
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}
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static int dds_transform(Tex* t, int new_flags)
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{
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const int dxt = t->flags & TEX_DXT, new_dxt = new_flags & TEX_DXT;
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// requesting decompression
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if(dxt && !new_dxt)
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return dds_decompress(t);
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// both are DXT (unsupported; there are no flags we can change while
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// compressed) or requesting compression (not implemented) or
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// both not DXT (nothing we can do) - bail.
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else
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return TEX_CODEC_CANNOT_HANDLE;
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}
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static int dds_decode(u8* file, size_t file_size, Tex* t, const char** perr_msg)
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{
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if(*(u32*)file != FOURCC('D','D','S',' '))
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return TEX_CODEC_CANNOT_HANDLE;
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const DDSURFACEDESC2* surf = (const DDSURFACEDESC2*)(file+4);
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const size_t hdr_size = 4+sizeof(DDSURFACEDESC2);
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// make sure we can access all header fields
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if(file_size < hdr_size)
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{
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*perr_msg = "header not completely read";
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fail:
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return ERR_CORRUPTED;
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}
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const u32 sd_size = read_le32(&surf->dwSize);
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const u32 sd_flags = read_le32(&surf->dwFlags);
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const u32 h = read_le32(&surf->dwHeight);
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const u32 w = read_le32(&surf->dwWidth);
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const u32 img_size = read_le32(&surf->dwLinearSize);
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u32 mipmaps = read_le32(&surf->dwMipMapCount);
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const u32 pf_size = read_le32(&surf->ddpfPixelFormat.dwSize);
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const u32 pf_flags = read_le32(&surf->ddpfPixelFormat.dwFlags);
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const u32 fourcc = surf->ddpfPixelFormat.dwFourCC;
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// compared against FOURCC, which takes care of endian conversion.
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// we'll use these fields; make sure they're present below.
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// note: we can't guess image dimensions if not specified -
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// the image isn't necessarily square.
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const u32 sd_req_flags = DDSD_WIDTH | DDSD_HEIGHT | DDSD_PIXELFORMAT;
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// make sure fields that aren't indicated as valid are zeroed.
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if(!(sd_flags & DDSD_MIPMAPCOUNT))
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mipmaps = 0;
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// MS DXTex tool doesn't set the required dwPitchOrLinearSize field -
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// they can't even write out their own file format correctly. *sigh*
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// we need to pass it to OpenGL; it's calculated from w, h, and bpp,
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// which we determine from the pixel format.
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int bpp = 0;
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int flags = 0;
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if(pf_flags & DDPF_ALPHAPIXELS)
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flags |= TEX_ALPHA;
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switch(fourcc)
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{
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case FOURCC('D','X','T','1'):
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bpp = 4;
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flags |= 1; // bits in TEX_DXT mask indicate format
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break;
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case FOURCC('D','X','T','3'):
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bpp = 8;
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flags |= 3; // "
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break;
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case FOURCC('D','X','T','5'):
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bpp = 8;
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flags |= 5; // "
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break;
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}
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if(mipmaps)
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flags |= TEX_MIPMAPS;
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// sanity checks
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const char* err = 0;
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if(file_size < hdr_size + img_size)
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err = "file size too small";
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if(w % 4 || h % 4)
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err = "image dimensions not padded to S3TC block size";
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if(!w || !h)
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err = "width or height = 0";
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if(bpp == 0)
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err = "invalid pixel format (not DXT{1,3,5})";
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if((sd_flags & sd_req_flags) != sd_req_flags)
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err = "missing one or more required fields (w, h, pixel format)";
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if(sizeof(DDPIXELFORMAT) != pf_size)
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err = "DDPIXELFORMAT size mismatch";
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if(sizeof(DDSURFACEDESC2) != sd_size)
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err = "DDSURFACEDESC2 size mismatch";
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if(err)
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{
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*perr_msg = err;
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goto fail;
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}
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t->ofs = hdr_size;
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t->w = w;
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t->h = h;
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t->bpp = bpp;
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t->flags = flags;
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return 0;
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}
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static int dds_encode(const char* UNUSED(ext), Tex* UNUSED(t), u8** UNUSED(out), size_t* UNUSED(out_size), const char** perr_msg)
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{
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return ERR_NOT_IMPLEMENTED;
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}
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TEX_CODEC_REGISTER(dds);
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