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FXT1 texture compression (initial draft)
This commit is contained in:
Daniel Borca
parent
fb4449033b
commit
6db87bc889
1 changed files with 640 additions and 35 deletions
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@ -26,6 +26,7 @@
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/**
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* \file texcompress_fxt1.c
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* GL_EXT_texture_compression_fxt1 support.
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* \author Daniel Borca
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*/
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@ -40,15 +41,15 @@
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#include "texstore.h"
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static GLuint
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compress_fxt1 (GLcontext *ctx,
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GLsizei srcWidth,
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GLsizei srcHeight,
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GLenum srcFormat,
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const GLchan *source,
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GLint srcRowStride,
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GLubyte *dest,
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GLint dstRowStride);
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int
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fxt1_encode (GLcontext *ctx,
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unsigned int width, unsigned int height,
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int srcFormat,
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const void *source, int srcRowStride,
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void *dest, int destRowStride);
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void
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fxt1_decode_1 (const void *texture, int width,
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int i, int j, unsigned char *rgba);
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/**
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@ -77,17 +78,14 @@ texstore_rgb_fxt1(STORE_PARAMS)
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ASSERT(dstYoffset % 4 == 0);
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ASSERT(dstZoffset == 0);
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/* [dBorca]
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* we still need to pass 4byte/texel to the codec
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*/
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if (1 || srcFormat != GL_RGB ||
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if (srcFormat != GL_RGB ||
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srcType != CHAN_TYPE ||
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ctx->_ImageTransferState ||
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srcPacking->SwapBytes) {
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/* convert image to RGB/GLchan */
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tempImage = _mesa_make_temp_chan_image(ctx, dims,
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baseInternalFormat,
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/*dstFormat->BaseFormat*/GL_RGBA,
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dstFormat->BaseFormat,
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srcWidth, srcHeight, srcDepth,
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srcFormat, srcType, srcAddr,
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srcPacking);
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@ -95,7 +93,7 @@ texstore_rgb_fxt1(STORE_PARAMS)
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return GL_FALSE; /* out of memory */
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_mesa_adjust_image_for_convolution(ctx, dims, &srcWidth, &srcHeight);
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pixels = tempImage;
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srcRowStride = /*3*/4 * srcWidth;
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srcRowStride = 3 * srcWidth;
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srcFormat = GL_RGB;
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}
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else {
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@ -108,11 +106,11 @@ texstore_rgb_fxt1(STORE_PARAMS)
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GL_COMPRESSED_RGB_FXT1_3DFX,
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texWidth, (GLubyte *) dstAddr);
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compress_fxt1(ctx, srcWidth, srcHeight, srcFormat, pixels, srcRowStride,
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dst, dstRowStride);
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fxt1_encode(ctx, srcWidth, srcHeight, srcFormat, pixels, srcRowStride,
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dst, dstRowStride);
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if (tempImage)
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_mesa_free((void *) tempImage);
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_mesa_free((void*) tempImage);
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return GL_TRUE;
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}
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@ -163,8 +161,8 @@ texstore_rgba_fxt1(STORE_PARAMS)
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GL_COMPRESSED_RGBA_FXT1_3DFX,
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texWidth, (GLubyte *) dstAddr);
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compress_fxt1(ctx, srcWidth, srcHeight, srcFormat, pixels, srcRowStride,
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dst, dstRowStride);
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fxt1_encode(ctx, srcWidth, srcHeight, srcFormat, pixels, srcRowStride,
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dst, dstRowStride);
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if (tempImage)
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_mesa_free((void*) tempImage);
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@ -177,7 +175,7 @@ static void
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fetch_texel_2d_rgba_fxt1( const struct gl_texture_image *texImage,
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GLint i, GLint j, GLint k, GLchan *texel )
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{
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/* XXX to do */
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fxt1_decode_1(texImage->Data, texImage->Width, i, j, texel);
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}
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@ -187,7 +185,7 @@ fetch_texel_2d_f_rgba_fxt1( const struct gl_texture_image *texImage,
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{
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/* just sample as GLchan and convert to float here */
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GLchan rgba[4];
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fetch_texel_2d_rgba_fxt1(texImage, i, j, k, rgba);
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fxt1_decode_1(texImage->Data, texImage->Width, i, j, rgba);
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texel[RCOMP] = CHAN_TO_FLOAT(rgba[RCOMP]);
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texel[GCOMP] = CHAN_TO_FLOAT(rgba[GCOMP]);
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texel[BCOMP] = CHAN_TO_FLOAT(rgba[BCOMP]);
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@ -199,7 +197,8 @@ static void
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fetch_texel_2d_rgb_fxt1( const struct gl_texture_image *texImage,
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GLint i, GLint j, GLint k, GLchan *texel )
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{
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/* XXX to do */
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fxt1_decode_1(texImage->Data, texImage->Width, i, j, texel);
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texel[ACOMP] = 255;
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}
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@ -209,11 +208,11 @@ fetch_texel_2d_f_rgb_fxt1( const struct gl_texture_image *texImage,
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{
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/* just sample as GLchan and convert to float here */
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GLchan rgba[4];
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fetch_texel_2d_rgb_fxt1(texImage, i, j, k, rgba);
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fxt1_decode_1(texImage->Data, texImage->Width, i, j, rgba);
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texel[RCOMP] = CHAN_TO_FLOAT(rgba[RCOMP]);
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texel[GCOMP] = CHAN_TO_FLOAT(rgba[GCOMP]);
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texel[BCOMP] = CHAN_TO_FLOAT(rgba[BCOMP]);
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texel[ACOMP] = CHAN_TO_FLOAT(rgba[ACOMP]);
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texel[ACOMP] = 1.0;
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}
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@ -263,16 +262,622 @@ const struct gl_texture_format _mesa_texformat_rgba_fxt1 = {
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};
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static GLuint
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compress_fxt1 (GLcontext *ctx,
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GLsizei srcWidth,
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GLsizei srcHeight,
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GLenum srcFormat,
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const GLchan *source,
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GLint srcRowStride,
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GLubyte *dest,
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GLint dstRowStride)
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/***************************************************************************\
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* FXT1 encoder
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*
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* The encoder was built by reversing the decoder,
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* and is vaguely based on Texus2 by 3dfx. Note that this code
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* is merely a proof of concept, since it is higly UNoptimized;
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* moreover it is sub-optimal due to Lloyd's algorithm.
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* Only CHROMA and non-lerp ALPHA is implemented!
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\***************************************************************************/
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#define MAX_COMP 4 /* ever meeded maximum number of components in texel */
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#define MAX_VECT 4 /* ever needed maximum number of base vectors to find */
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#define N_TEXELS 32 /* number of texels in a block (always 32) */
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#define LL_N_REP 50 /* number of iterations in lloyd's vq */
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#define LL_MAX_E 255 /* fault tolerance (maximum error) */
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static int
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fxt1_besterr (float vec[][MAX_COMP], int nv,
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unsigned char input[MAX_COMP], int nc,
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float *d)
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{
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/* here be dragons */
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int i, j, best = -1;
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float err = 1e5; /* big enough */
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for (j = 0; j < nv; j++) {
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float e = 0;
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for (i = 0; i < nc; i++) {
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e += (vec[j][i] - input[i]) * (vec[j][i] - input[i]);
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}
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if (e < err) {
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err = e;
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best = j;
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}
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}
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*d = err;
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return best;
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}
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static int
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fxt1_worsterr (float vec[MAX_COMP],
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unsigned char input[N_TEXELS][MAX_COMP], int nc, int n)
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{
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int i, k, worst = -1;
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float err = -1; /* small enough */
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for (k = 0; k < n; k++) {
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float e = 0;
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for (i = 0; i < nc; i++) {
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e += (vec[i] - input[k][i]) * (vec[i] - input[k][i]);
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}
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if (e > err) {
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err = e;
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worst = k;
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}
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}
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return worst;
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}
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static void
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fxt1_lloyd (float vec[][MAX_COMP], int nv,
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unsigned char input[N_TEXELS][MAX_COMP], int nc, int n)
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{
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/* Use the generalized lloyd's algorithm for VQ:
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* find 4 color vectors.
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*
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* for each sample color
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* sort to nearest vector.
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*
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* replace each vector with the centroid of it's matching colors.
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*
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* repeat until RMS doesn't improve.
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*
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* if a color vector has no samples, or becomes the same as another
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* vector, replace it with the color which is farthest from a sample.
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*
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* vec[][MAX_COMP] resulting colors
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* nv number of resulting colors required
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* input[N_TEXELS][MAX_COMP] input texels
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* nc number of components in input / vec
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* n number of input samples
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*/
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int sum[MAX_VECT][MAX_COMP]; /* used to accumulate closest texels */
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int cnt[MAX_VECT]; /* how many times a certain vector was chosen */
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float error;
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int i, j, k, rep;
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/* choose the base vectors from input */
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for (j = 0; j < nv; j++) {
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int m = j * (n - 1) / (nv - 1);
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for (i = 0; i < nc; i++) {
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vec[j][i] = input[m][i];
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}
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}
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/* the quantizer */
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for (rep = 0; rep < LL_N_REP; rep++) {
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/* reset sums & counters */
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for (j = 0; j < nv; j++) {
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for (i = 0; i < nc; i++) {
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sum[j][i] = 0;
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}
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cnt[j] = 0;
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}
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error = 0;
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/* scan whole block */
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for (k = 0; k < n; k++) {
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float d;
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int best = fxt1_besterr(vec, nv, input[k], nc, &d);
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/* add in closest color */
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for (i = 0; i < nc; i++) {
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sum[best][i] += input[k][i];
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}
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/* mark this vector as used */
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cnt[best]++;
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/* accumulate error */
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error += d;
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}
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/* accumulated distance (error) small enough? */
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if (error < LL_MAX_E) {
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break;
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}
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/* move each vector to the barycenter of its closest colors */
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for (j = 0; j < nv; j++) {
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if (cnt[j]) {
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float div = 1.0 / cnt[j];
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for (i = 0; i < nc; i++) {
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vec[j][i] = div * sum[j][i];
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}
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} else {
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/* this vec has no samples or is identical with a previous vec */
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int worst = fxt1_worsterr(vec[j], input, nc, n);
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for (i = 0; i < nc; i++) {
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vec[j][i] = input[worst][i];
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}
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}
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}
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}
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}
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static void
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fxt1_quantize_CHROMA (unsigned long *cc,
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unsigned char input[N_TEXELS][MAX_COMP])
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{
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const int n_vect = 4; /* 4 base vectors to find */
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const int n_comp = 3; /* 3 components: R, G, B */
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float vec[MAX_VECT][MAX_COMP];
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int i, j, k;
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unsigned long long hihi; /* high quadword */
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unsigned long lohi, lolo; /* low quadword: hi dword, lo dword */
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float d;
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fxt1_lloyd(vec, n_vect, input, n_comp, N_TEXELS);
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hihi = 4; /* cc-chroma = "010" + unused bit */
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for (j = 0; j < n_vect; j++) {
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for (i = 0; i < n_comp; i++) {
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/* add in colors */
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hihi <<= 5;
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hihi |= (unsigned int)vec[n_vect - 1 - j][i] >> 3;
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}
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}
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((unsigned long long *)cc)[1] = hihi;
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lohi = lolo = 0;
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/* right microtile */
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for (k = N_TEXELS - 1; k >= N_TEXELS/2; k--) {
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lohi <<= 2;
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lohi |= fxt1_besterr(vec, n_vect, input[k], n_comp, &d);
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}
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/* left microtile */
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for (; k >= 0; k--) {
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lolo <<= 2;
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lolo |= fxt1_besterr(vec, n_vect, input[k], n_comp, &d);
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}
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cc[1] = lohi;
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cc[0] = lolo;
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}
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static void
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fxt1_quantize_ALPHA0 (unsigned long *cc,
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unsigned char input[N_TEXELS][MAX_COMP],
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unsigned char reord[N_TEXELS][MAX_COMP], int n)
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{
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const int n_vect = 3; /* 3 base vectors to find */
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const int n_comp = 4; /* 4 components: R, G, B, A */
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float vec[MAX_VECT][MAX_COMP];
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int i, j, k;
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unsigned long long hihi; /* high quadword */
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unsigned long lohi, lolo; /* low quadword: hi dword, lo dword */
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float d;
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/* the last vector indicates zero */
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for (i = 0; i < n_comp; i++) {
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vec[n_vect][i] = 0;
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}
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/* the first n texels in reord are guaranteed to be non-zero */
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fxt1_lloyd(vec, n_vect, reord, n_comp, n);
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hihi = 6; /* alpha = "011" + lerp = 0 */
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for (j = 0; j < n_vect; j++) {
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/* add in alphas */
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hihi <<= 5;
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hihi |= (unsigned int)vec[n_vect - 1 - j][n_comp - 1] >> 3;
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}
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for (j = 0; j < n_vect; j++) {
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for (i = 0; i < n_comp - 1; i++) {
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/* add in colors */
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hihi <<= 5;
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hihi |= (unsigned int)vec[n_vect - 1 - j][i] >> 3;
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}
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}
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((unsigned long long *)cc)[1] = hihi;
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lohi = lolo = 0;
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/* right microtile */
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for (k = N_TEXELS - 1; k >= N_TEXELS/2; k--) {
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lohi <<= 2;
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lohi |= fxt1_besterr(vec, n_vect + 1, input[k], n_comp, &d);
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}
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/* left microtile */
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for (; k >= 0; k--) {
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lolo <<= 2;
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lolo |= fxt1_besterr(vec, n_vect + 1, input[k], n_comp, &d);
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}
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cc[1] = lohi;
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cc[0] = lolo;
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}
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static void
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fxt1_quantize (unsigned long *cc, const unsigned char *lines[], int comps)
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{
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int trualpha = 0;
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unsigned char reord[N_TEXELS][MAX_COMP];
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unsigned char input[N_TEXELS][MAX_COMP];
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int i, k, l;
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/* 8 texels each line */
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for (l = 0; l < 4; l++) {
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for (k = 0; k < 4; k++) {
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for (i = 0; i < comps; i++) {
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input[k + l * 4][i] = *lines[l]++;
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}
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for (; i < MAX_COMP; i++) {
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input[k + l * 4][i] = 255;
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}
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}
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for (k = 0; k < 4; k++) {
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for (i = 0; i < comps; i++) {
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input[k + l * 4 + 16][i] = *lines[l]++;
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}
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for (; i < MAX_COMP; i++) {
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input[k + l * 4 + 16][i] = 255;
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}
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}
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}
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/* [dBorca]
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* stupidity flows forth from this
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*/
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if (comps == 4) {
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/* skip all transparent black texels */
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l = 0;
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for (k = 0; k < N_TEXELS; k++) {
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int t = 0;
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/* test all components against 0 */
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for (i = 0; i < comps; i++) {
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reord[l][i] = input[k][i];
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t += input[k][i];
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}
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if (t) {
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/* texel is not transparent black */
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if (reord[l][comps - 1] < 255) {
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/* non-opaque texel */
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trualpha = !0;
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}
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l++;
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} else {
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/* transparent black texel */
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trualpha = !0;
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}
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}
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}
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if (trualpha) {
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fxt1_quantize_ALPHA0(cc, input, reord, l);
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} else {
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fxt1_quantize_CHROMA(cc, input);
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}
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}
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int
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fxt1_encode (GLcontext *ctx,
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unsigned int width, unsigned int height,
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int srcFormat,
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const void *source, int srcRowStride,
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void *dest, int destRowStride)
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{
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const int comps = (srcFormat == GL_RGB) ? 3 : 4;
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unsigned int x, y;
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const unsigned char *data = source;
|
||||
unsigned long *encoded = dest;
|
||||
GLubyte *newSource = NULL;
|
||||
|
||||
/*
|
||||
* Rescale image if width is less than 8 or height is less than 4.
|
||||
*/
|
||||
if (width < 8 || height < 4) {
|
||||
GLint newWidth = (width + 7) & ~7;
|
||||
GLint newHeight = (height + 3) & ~3;
|
||||
newSource = MALLOC(comps * newWidth * newHeight * sizeof(GLchan));
|
||||
_mesa_upscale_teximage2d(width, height, newWidth, newHeight,
|
||||
comps, source, srcRowStride, newSource);
|
||||
source = newSource;
|
||||
width = newWidth;
|
||||
height = newHeight;
|
||||
srcRowStride = comps * newWidth;
|
||||
}
|
||||
|
||||
destRowStride = (destRowStride - width * 2) / 4;
|
||||
for (y = 0; y < height; y += 4) {
|
||||
for (x = 0; x < width; x += 8) {
|
||||
const unsigned char *lines[4];
|
||||
lines[0] = &data[x * comps + (y + 0) * srcRowStride];
|
||||
lines[1] = &data[x * comps + (y + 1) * srcRowStride];
|
||||
lines[2] = &data[x * comps + (y + 2) * srcRowStride];
|
||||
lines[3] = &data[x * comps + (y + 3) * srcRowStride];
|
||||
fxt1_quantize(encoded, lines, comps);
|
||||
/* 128 bits per 8x4 block = 4bpp */
|
||||
encoded += 4;
|
||||
}
|
||||
encoded += destRowStride;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
|
||||
/***************************************************************************\
|
||||
* FXT1 decoder
|
||||
*
|
||||
* The decoder is based on GL_3DFX_texture_compression_FXT1
|
||||
* specification and serves as a concept for the encoder.
|
||||
\***************************************************************************/
|
||||
|
||||
|
||||
/* lookup table for scaling 5 bit colors up to 8 bits */
|
||||
static unsigned char _rgb_scale_5[] = {
|
||||
0, 8, 16, 25, 33, 41, 49, 58,
|
||||
66, 74, 82, 90, 99, 107, 115, 123,
|
||||
132, 140, 148, 156, 165, 173, 181, 189,
|
||||
197, 206, 214, 222, 230, 239, 247, 255
|
||||
};
|
||||
|
||||
/* lookup table for scaling 6 bit colors up to 8 bits */
|
||||
static unsigned char _rgb_scale_6[] = {
|
||||
0, 4, 8, 12, 16, 20, 24, 28,
|
||||
32, 36, 40, 45, 49, 53, 57, 61,
|
||||
65, 69, 73, 77, 81, 85, 89, 93,
|
||||
97, 101, 105, 109, 113, 117, 121, 125,
|
||||
130, 134, 138, 142, 146, 150, 154, 158,
|
||||
162, 166, 170, 174, 178, 182, 186, 190,
|
||||
194, 198, 202, 206, 210, 215, 219, 223,
|
||||
227, 231, 235, 239, 243, 247, 251, 255
|
||||
};
|
||||
|
||||
|
||||
#define CC_SEL(cc, which) ((cc)[(which) / 32] >> ((which) & 31))
|
||||
#define UP5(c) _rgb_scale_5[(c) & 31]
|
||||
#define UP6(c, b) _rgb_scale_6[(((c) & 31) << 1) | ((b) & 1)]
|
||||
#define LERP(n, t, c0, c1) (((n) - (t)) * (c0) + (t) * (c1) + (n) / 2) / (n)
|
||||
#define ZERO_4UBV(v) *((unsigned long *)(v)) = 0
|
||||
|
||||
|
||||
static void
|
||||
fxt1_decode_1HI (unsigned long code, int t, unsigned char *rgba)
|
||||
{
|
||||
const unsigned long *cc;
|
||||
|
||||
t *= 3;
|
||||
cc = (unsigned long *)(code + t / 8);
|
||||
t = (cc[0] >> (t & 7)) & 7;
|
||||
|
||||
if (t == 7) {
|
||||
ZERO_4UBV(rgba);
|
||||
} else {
|
||||
cc = (unsigned long *)(code + 12);
|
||||
if (t == 0) {
|
||||
rgba[BCOMP] = UP5(CC_SEL(cc, 0));
|
||||
rgba[GCOMP] = UP5(CC_SEL(cc, 5));
|
||||
rgba[RCOMP] = UP5(CC_SEL(cc, 10));
|
||||
} else if (t == 6) {
|
||||
rgba[BCOMP] = UP5(CC_SEL(cc, 15));
|
||||
rgba[GCOMP] = UP5(CC_SEL(cc, 20));
|
||||
rgba[RCOMP] = UP5(CC_SEL(cc, 25));
|
||||
} else {
|
||||
rgba[BCOMP] = LERP(6, t, UP5(CC_SEL(cc, 0)), UP5(CC_SEL(cc, 15)));
|
||||
rgba[GCOMP] = LERP(6, t, UP5(CC_SEL(cc, 5)), UP5(CC_SEL(cc, 20)));
|
||||
rgba[RCOMP] = LERP(6, t, UP5(CC_SEL(cc, 10)), UP5(CC_SEL(cc, 25)));
|
||||
}
|
||||
rgba[ACOMP] = 255;
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
static void
|
||||
fxt1_decode_1CHROMA (unsigned long code, int t, unsigned char *rgba)
|
||||
{
|
||||
const unsigned long *cc;
|
||||
unsigned long kk;
|
||||
|
||||
cc = (unsigned long *)code;
|
||||
if (t & 16) {
|
||||
cc++;
|
||||
t &= 15;
|
||||
}
|
||||
t = (cc[0] >> (t * 2)) & 3;
|
||||
|
||||
t *= 15;
|
||||
cc = (unsigned long *)(code + 8 + t / 8);
|
||||
kk = cc[0] >> (t & 7);
|
||||
rgba[BCOMP] = UP5(kk);
|
||||
rgba[GCOMP] = UP5(kk >> 5);
|
||||
rgba[RCOMP] = UP5(kk >> 10);
|
||||
rgba[ACOMP] = 255;
|
||||
}
|
||||
|
||||
|
||||
static void
|
||||
fxt1_decode_1MIXED (unsigned long code, int t, unsigned char *rgba)
|
||||
{
|
||||
const unsigned long *cc;
|
||||
unsigned int col[2][3];
|
||||
int glsb, selb;
|
||||
|
||||
cc = (unsigned long *)code;
|
||||
if (t & 16) {
|
||||
t &= 15;
|
||||
t = (cc[1] >> (t * 2)) & 3;
|
||||
/* col 2 */
|
||||
col[0][BCOMP] = (*(unsigned long *)(code + 11)) >> 6;
|
||||
col[0][GCOMP] = CC_SEL(cc, 99);
|
||||
col[0][RCOMP] = CC_SEL(cc, 104);
|
||||
/* col 3 */
|
||||
col[1][BCOMP] = CC_SEL(cc, 109);
|
||||
col[1][GCOMP] = CC_SEL(cc, 114);
|
||||
col[1][RCOMP] = CC_SEL(cc, 119);
|
||||
glsb = CC_SEL(cc, 126);
|
||||
selb = CC_SEL(cc, 33);
|
||||
} else {
|
||||
t = (cc[0] >> (t * 2)) & 3;
|
||||
/* col 0 */
|
||||
col[0][BCOMP] = CC_SEL(cc, 64);
|
||||
col[0][GCOMP] = CC_SEL(cc, 69);
|
||||
col[0][RCOMP] = CC_SEL(cc, 74);
|
||||
/* col 1 */
|
||||
col[1][BCOMP] = CC_SEL(cc, 79);
|
||||
col[1][GCOMP] = CC_SEL(cc, 84);
|
||||
col[1][RCOMP] = CC_SEL(cc, 89);
|
||||
glsb = CC_SEL(cc, 125);
|
||||
selb = CC_SEL(cc, 1);
|
||||
}
|
||||
|
||||
if (CC_SEL(cc, 124) & 1) {
|
||||
/* alpha[0] == 1 */
|
||||
|
||||
if (t == 3) {
|
||||
ZERO_4UBV(rgba);
|
||||
} else {
|
||||
if (t == 0) {
|
||||
rgba[BCOMP] = UP5(col[0][BCOMP]);
|
||||
rgba[GCOMP] = UP5(col[0][GCOMP]);
|
||||
rgba[RCOMP] = UP5(col[0][RCOMP]);
|
||||
} else if (t == 2) {
|
||||
rgba[BCOMP] = UP5(col[1][BCOMP]);
|
||||
rgba[GCOMP] = UP6(col[1][GCOMP], glsb);
|
||||
rgba[RCOMP] = UP5(col[1][RCOMP]);
|
||||
} else {
|
||||
rgba[BCOMP] = (UP5(col[0][BCOMP]) + UP5(col[1][BCOMP])) / 2;
|
||||
rgba[GCOMP] = (UP5(col[0][GCOMP]) + UP6(col[1][GCOMP], glsb)) / 2;
|
||||
rgba[RCOMP] = (UP5(col[0][RCOMP]) + UP5(col[1][RCOMP])) / 2;
|
||||
}
|
||||
rgba[ACOMP] = 255;
|
||||
}
|
||||
} else {
|
||||
/* alpha[0] == 0 */
|
||||
|
||||
if (t == 0) {
|
||||
rgba[BCOMP] = UP5(col[0][BCOMP]);
|
||||
rgba[GCOMP] = UP6(col[0][GCOMP], glsb ^ selb);
|
||||
rgba[RCOMP] = UP5(col[0][RCOMP]);
|
||||
} else if (t == 3) {
|
||||
rgba[BCOMP] = UP5(col[1][BCOMP]);
|
||||
rgba[GCOMP] = UP6(col[1][GCOMP], glsb);
|
||||
rgba[RCOMP] = UP5(col[1][RCOMP]);
|
||||
} else {
|
||||
rgba[BCOMP] = LERP(3, t, UP5(col[0][BCOMP]), UP5(col[1][BCOMP]));
|
||||
rgba[GCOMP] = LERP(3, t, UP6(col[0][GCOMP], glsb ^ selb),
|
||||
UP6(col[1][GCOMP], glsb));
|
||||
rgba[RCOMP] = LERP(3, t, UP5(col[0][RCOMP]), UP5(col[1][RCOMP]));
|
||||
}
|
||||
rgba[ACOMP] = 255;
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
static void
|
||||
fxt1_decode_1ALPHA (unsigned long code, int t, unsigned char *rgba)
|
||||
{
|
||||
const unsigned long *cc;
|
||||
|
||||
cc = (unsigned long *)code;
|
||||
if (CC_SEL(cc, 124) & 1) {
|
||||
/* lerp == 1 */
|
||||
unsigned int col0[4];
|
||||
|
||||
if (t & 16) {
|
||||
t &= 15;
|
||||
t = (cc[1] >> (t * 2)) & 3;
|
||||
/* col 2 */
|
||||
col0[BCOMP] = (*(unsigned long *)(code + 11)) >> 6;
|
||||
col0[GCOMP] = CC_SEL(cc, 99);
|
||||
col0[RCOMP] = CC_SEL(cc, 104);
|
||||
col0[ACOMP] = CC_SEL(cc, 119);
|
||||
} else {
|
||||
t = (cc[0] >> (t * 2)) & 3;
|
||||
/* col 0 */
|
||||
col0[BCOMP] = CC_SEL(cc, 64);
|
||||
col0[GCOMP] = CC_SEL(cc, 69);
|
||||
col0[RCOMP] = CC_SEL(cc, 74);
|
||||
col0[ACOMP] = CC_SEL(cc, 109);
|
||||
}
|
||||
|
||||
if (t == 0) {
|
||||
rgba[BCOMP] = UP5(col0[BCOMP]);
|
||||
rgba[GCOMP] = UP5(col0[GCOMP]);
|
||||
rgba[RCOMP] = UP5(col0[RCOMP]);
|
||||
rgba[ACOMP] = UP5(col0[ACOMP]);
|
||||
} else if (t == 3) {
|
||||
rgba[BCOMP] = UP5(CC_SEL(cc, 79));
|
||||
rgba[GCOMP] = UP5(CC_SEL(cc, 84));
|
||||
rgba[RCOMP] = UP5(CC_SEL(cc, 89));
|
||||
rgba[ACOMP] = UP5(CC_SEL(cc, 114));
|
||||
} else {
|
||||
rgba[BCOMP] = LERP(3, t, UP5(col0[BCOMP]), UP5(CC_SEL(cc, 79)));
|
||||
rgba[GCOMP] = LERP(3, t, UP5(col0[GCOMP]), UP5(CC_SEL(cc, 84)));
|
||||
rgba[RCOMP] = LERP(3, t, UP5(col0[RCOMP]), UP5(CC_SEL(cc, 89)));
|
||||
rgba[ACOMP] = LERP(3, t, UP5(col0[ACOMP]), UP5(CC_SEL(cc, 114)));
|
||||
}
|
||||
} else {
|
||||
/* lerp == 0 */
|
||||
|
||||
if (t & 16) {
|
||||
cc++;
|
||||
t &= 15;
|
||||
}
|
||||
t = (cc[0] >> (t * 2)) & 3;
|
||||
|
||||
if (t == 3) {
|
||||
ZERO_4UBV(rgba);
|
||||
} else {
|
||||
unsigned long kk;
|
||||
cc = (unsigned long *)code;
|
||||
rgba[ACOMP] = UP5(cc[3] >> (t * 5 + 13));
|
||||
t *= 15;
|
||||
cc = (unsigned long *)(code + 8 + t / 8);
|
||||
kk = cc[0] >> (t & 7);
|
||||
rgba[BCOMP] = UP5(kk);
|
||||
rgba[GCOMP] = UP5(kk >> 5);
|
||||
rgba[RCOMP] = UP5(kk >> 10);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
void
|
||||
fxt1_decode_1 (const void *texture, int width,
|
||||
int i, int j, unsigned char *rgba)
|
||||
{
|
||||
static void (*decode_1[]) (unsigned long, int, unsigned char *) = {
|
||||
fxt1_decode_1HI, /* cc-high = "00?" */
|
||||
fxt1_decode_1HI, /* cc-high = "00?" */
|
||||
fxt1_decode_1CHROMA, /* cc-chroma = "010" */
|
||||
fxt1_decode_1ALPHA, /* alpha = "011" */
|
||||
fxt1_decode_1MIXED, /* mixed = "1??" */
|
||||
fxt1_decode_1MIXED, /* mixed = "1??" */
|
||||
fxt1_decode_1MIXED, /* mixed = "1??" */
|
||||
fxt1_decode_1MIXED /* mixed = "1??" */
|
||||
};
|
||||
|
||||
unsigned long code = (unsigned long)texture +
|
||||
((j / 4) * (width / 8) + (i / 8)) * 16;
|
||||
int mode = CC_SEL((unsigned long *)code, 125);
|
||||
int t = i & 7;
|
||||
|
||||
if (t & 4) {
|
||||
t += 12;
|
||||
}
|
||||
t += (j & 3) * 4;
|
||||
|
||||
decode_1[mode](code, t, rgba);
|
||||
}
|
||||
|
|
|
|||
Loading…
Add table
Reference in a new issue