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-rw-r--r--opengl/libagl/dxt.cpp636
1 files changed, 0 insertions, 636 deletions
diff --git a/opengl/libagl/dxt.cpp b/opengl/libagl/dxt.cpp
deleted file mode 100644
index 238c81f..0000000
--- a/opengl/libagl/dxt.cpp
+++ /dev/null
@@ -1,636 +0,0 @@
-/* libs/opengles/dxt.cpp
-**
-** Copyright 2007, The Android Open Source Project
-**
-** Licensed under the Apache License, Version 2.0 (the "License");
-** you may not use this file except in compliance with the License.
-** You may obtain a copy of the License at
-**
-** http://www.apache.org/licenses/LICENSE-2.0
-**
-** Unless required by applicable law or agreed to in writing, software
-** distributed under the License is distributed on an "AS IS" BASIS,
-** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-** See the License for the specific language governing permissions and
-** limitations under the License.
-*/
-
-#define TIMING 0
-
-#if TIMING
-#include <sys/time.h> // for optimization timing
-#include <stdio.h>
-#include <stdlib.h>
-#endif
-
-#include <GLES/gl.h>
-#include <utils/Endian.h>
-
-#include "context.h"
-
-#define TIMING 0
-
-namespace android {
-
-static uint8_t avg23tab[64*64];
-static volatile int tables_initialized = 0;
-
-// Definitions below are equivalent to these over the valid range of arguments
-// #define div5(x) ((x)/5)
-// #define div7(x) ((x)/7)
-
-// Use fixed-point to divide by 5 and 7
-// 3277 = 2^14/5 + 1
-// 2341 = 2^14/7 + 1
-#define div5(x) (((x)*3277) >> 14)
-#define div7(x) (((x)*2341) >> 14)
-
-// Table with entry [a << 6 | b] = (2*a + b)/3 for 0 <= a,b < 64
-#define avg23(x0,x1) avg23tab[((x0) << 6) | (x1)]
-
-// Extract 5/6/5 RGB
-#define red(x) (((x) >> 11) & 0x1f)
-#define green(x) (((x) >> 5) & 0x3f)
-#define blue(x) ( (x) & 0x1f)
-
-/*
- * Convert 5/6/5 RGB (as 3 ints) to 8/8/8
- *
- * Operation count: 8 <<, 0 &, 5 |
- */
-inline static int rgb565SepTo888(int r, int g, int b)
-
-{
- return ((((r << 3) | (r >> 2)) << 16) |
- (((g << 2) | (g >> 4)) << 8) |
- ((b << 3) | (b >> 2)));
-}
-
-/*
- * Convert 5/6/5 RGB (as a single 16-bit word) to 8/8/8
- *
- * r4r3r2r1 r0g5g4g3 g2g1g0b4 b3b2b1b0 rgb
- * r4r3r2 r1r0g5g4 g3g2g1g0 b4b3b2b1 b0 0 0 0 rgb << 3
- * r4r3r2r1 r0r4r3r2 g5g4g3g2 g1g0g5g4 b4b3b2b1 b0b4b3b2 desired result
- *
- * Construct the 24-bit RGB word as:
- *
- * r4r3r2r1 r0------ -------- -------- -------- -------- (rgb << 8) & 0xf80000
- * r4r3r2 -------- -------- -------- -------- (rgb << 3) & 0x070000
- * g5g4g3g2 g1g0---- -------- -------- (rgb << 5) & 0x00fc00
- * g5g4 -------- -------- (rgb >> 1) & 0x000300
- * b4b3b2b1 b0------ (rgb << 3) & 0x0000f8
- * b4b3b2 (rgb >> 2) & 0x000007
- *
- * Operation count: 5 <<, 6 &, 5 | (n.b. rgb >> 3 is used twice)
- */
-inline static int rgb565To888(int rgb)
-
-{
- int rgb3 = rgb >> 3;
- return (((rgb << 8) & 0xf80000) |
- ( rgb3 & 0x070000) |
- ((rgb << 5) & 0x00fc00) |
- ((rgb >> 1) & 0x000300) |
- ( rgb3 & 0x0000f8) |
- ((rgb >> 2) & 0x000007));
-}
-
-#if __BYTE_ORDER == __BIG_ENDIAN
-static uint32_t swap(uint32_t x) {
- int b0 = (x >> 24) & 0xff;
- int b1 = (x >> 16) & 0xff;
- int b2 = (x >> 8) & 0xff;
- int b3 = (x ) & 0xff;
-
- return (uint32_t)((b3 << 24) | (b2 << 16) | (b1 << 8) | b0);
-}
-#endif
-
-static void
-init_tables()
-{
- if (tables_initialized) {
- return;
- }
-
- for (int i = 0; i < 64; i++) {
- for (int j = 0; j < 64; j++) {
- int avg = (2*i + j)/3;
- avg23tab[(i << 6) | j] = avg;
- }
- }
-
- asm volatile ("" : : : "memory");
- tables_initialized = 1;
-}
-
-/*
- * Utility to scan a DXT1 compressed texture to determine whether it
- * contains a transparent pixel (color0 < color1, code == 3). This
- * may be useful if the application lacks information as to whether
- * the true format is GL_COMPRESSED_RGB_S3TC_DXT1_EXT or
- * GL_COMPRESSED_RGBA_S3TC_DXT1_EXT.
- */
-bool
-DXT1HasAlpha(const GLvoid *data, int width, int height) {
-#if TIMING
- struct timeval start_t, end_t;
- struct timezone tz;
-
- gettimeofday(&start_t, &tz);
-#endif
-
- bool hasAlpha = false;
-
- int xblocks = (width + 3)/4;
- int yblocks = (height + 3)/4;
- int numblocks = xblocks*yblocks;
-
- uint32_t const *d32 = (uint32_t *)data;
- for (int b = 0; b < numblocks; b++) {
- uint32_t colors = *d32++;
-
-#if __BYTE_ORDER == __BIG_ENDIAN
- colors = swap(colors);
-#endif
-
- uint16_t color0 = colors & 0xffff;
- uint16_t color1 = colors >> 16;
-
- if (color0 < color1) {
- // There's no need to endian-swap within 'bits'
- // since we don't care which pixel is the transparent one
- uint32_t bits = *d32++;
-
- // Detect if any (odd, even) pair of bits are '11'
- // bits: b31 b30 b29 ... b3 b2 b1 b0
- // bits >> 1: b31 b31 b30 ... b4 b3 b2 b1
- // &: b31 (b31 & b30) (b29 & b28) ... (b2 & b1) (b1 & b0)
- // & 0x55..: 0 (b31 & b30) 0 ... 0 (b1 & b0)
- if (((bits & (bits >> 1)) & 0x55555555) != 0) {
- hasAlpha = true;
- goto done;
- }
- } else {
- // Skip 4 bytes
- ++d32;
- }
- }
-
- done:
-#if TIMING
- gettimeofday(&end_t, &tz);
- long usec = (end_t.tv_sec - start_t.tv_sec)*1000000 +
- (end_t.tv_usec - start_t.tv_usec);
-
- printf("Scanned w=%d h=%d in %ld usec\n", width, height, usec);
-#endif
-
- return hasAlpha;
-}
-
-static void
-decodeDXT1(const GLvoid *data, int width, int height,
- void *surface, int stride,
- bool hasAlpha)
-
-{
- init_tables();
-
- uint32_t const *d32 = (uint32_t *)data;
-
- // Color table for the current block
- uint16_t c[4];
- c[0] = c[1] = c[2] = c[3] = 0;
-
- // Specified colors from the previous block
- uint16_t prev_color0 = 0x0000;
- uint16_t prev_color1 = 0x0000;
-
- uint16_t* rowPtr = (uint16_t*)surface;
- for (int base_y = 0; base_y < height; base_y += 4, rowPtr += 4*stride) {
- uint16_t *blockPtr = rowPtr;
- for (int base_x = 0; base_x < width; base_x += 4, blockPtr += 4) {
- uint32_t colors = *d32++;
- uint32_t bits = *d32++;
-
-#if __BYTE_ORDER == __BIG_ENDIAN
- colors = swap(colors);
- bits = swap(bits);
-#endif
-
- // Raw colors
- uint16_t color0 = colors & 0xffff;
- uint16_t color1 = colors >> 16;
-
- // If the new block has the same base colors as the
- // previous one, we don't need to recompute the color
- // table c[]
- if (color0 != prev_color0 || color1 != prev_color1) {
- // Store raw colors for comparison with next block
- prev_color0 = color0;
- prev_color1 = color1;
-
- int r0 = red(color0);
- int g0 = green(color0);
- int b0 = blue(color0);
-
- int r1 = red(color1);
- int g1 = green(color1);
- int b1 = blue(color1);
-
- if (hasAlpha) {
- c[0] = (r0 << 11) | ((g0 >> 1) << 6) | (b0 << 1) | 0x1;
- c[1] = (r1 << 11) | ((g1 >> 1) << 6) | (b1 << 1) | 0x1;
- } else {
- c[0] = color0;
- c[1] = color1;
- }
-
- int r2, g2, b2, r3, g3, b3, a3;
-
- int bbits = bits >> 1;
- bool has2 = ((bbits & ~bits) & 0x55555555) != 0;
- bool has3 = ((bbits & bits) & 0x55555555) != 0;
-
- if (has2 || has3) {
- if (color0 > color1) {
- r2 = avg23(r0, r1);
- g2 = avg23(g0, g1);
- b2 = avg23(b0, b1);
-
- r3 = avg23(r1, r0);
- g3 = avg23(g1, g0);
- b3 = avg23(b1, b0);
- a3 = 1;
- } else {
- r2 = (r0 + r1) >> 1;
- g2 = (g0 + g1) >> 1;
- b2 = (b0 + b1) >> 1;
-
- r3 = g3 = b3 = a3 = 0;
- }
- if (hasAlpha) {
- c[2] = (r2 << 11) | ((g2 >> 1) << 6) |
- (b2 << 1) | 0x1;
- c[3] = (r3 << 11) | ((g3 >> 1) << 6) |
- (b3 << 1) | a3;
- } else {
- c[2] = (r2 << 11) | (g2 << 5) | b2;
- c[3] = (r3 << 11) | (g3 << 5) | b3;
- }
- }
- }
-
- uint16_t* blockRowPtr = blockPtr;
- for (int y = 0; y < 4; y++, blockRowPtr += stride) {
- // Don't process rows past the botom
- if (base_y + y >= height) {
- break;
- }
-
- int w = min(width - base_x, 4);
- for (int x = 0; x < w; x++) {
- int code = bits & 0x3;
- bits >>= 2;
-
- blockRowPtr[x] = c[code];
- }
- }
- }
- }
-}
-
-// Output data as internalformat=GL_RGBA, type=GL_UNSIGNED_BYTE
-static void
-decodeDXT3(const GLvoid *data, int width, int height,
- void *surface, int stride)
-
-{
- init_tables();
-
- uint32_t const *d32 = (uint32_t *)data;
-
- // Specified colors from the previous block
- uint16_t prev_color0 = 0x0000;
- uint16_t prev_color1 = 0x0000;
-
- // Color table for the current block
- uint32_t c[4];
- c[0] = c[1] = c[2] = c[3] = 0;
-
- uint32_t* rowPtr = (uint32_t*)surface;
- for (int base_y = 0; base_y < height; base_y += 4, rowPtr += 4*stride) {
- uint32_t *blockPtr = rowPtr;
- for (int base_x = 0; base_x < width; base_x += 4, blockPtr += 4) {
-
-#if __BYTE_ORDER == __BIG_ENDIAN
- uint32_t alphahi = *d32++;
- uint32_t alphalo = *d32++;
- alphahi = swap(alphahi);
- alphalo = swap(alphalo);
-#else
- uint32_t alphalo = *d32++;
- uint32_t alphahi = *d32++;
-#endif
-
- uint32_t colors = *d32++;
- uint32_t bits = *d32++;
-
-#if __BYTE_ORDER == __BIG_ENDIAN
- colors = swap(colors);
- bits = swap(bits);
-#endif
-
- uint64_t alpha = ((uint64_t)alphahi << 32) | alphalo;
-
- // Raw colors
- uint16_t color0 = colors & 0xffff;
- uint16_t color1 = colors >> 16;
-
- // If the new block has the same base colors as the
- // previous one, we don't need to recompute the color
- // table c[]
- if (color0 != prev_color0 || color1 != prev_color1) {
- // Store raw colors for comparison with next block
- prev_color0 = color0;
- prev_color1 = color1;
-
- int bbits = bits >> 1;
- bool has2 = ((bbits & ~bits) & 0x55555555) != 0;
- bool has3 = ((bbits & bits) & 0x55555555) != 0;
-
- if (has2 || has3) {
- int r0 = red(color0);
- int g0 = green(color0);
- int b0 = blue(color0);
-
- int r1 = red(color1);
- int g1 = green(color1);
- int b1 = blue(color1);
-
- int r2 = avg23(r0, r1);
- int g2 = avg23(g0, g1);
- int b2 = avg23(b0, b1);
-
- int r3 = avg23(r1, r0);
- int g3 = avg23(g1, g0);
- int b3 = avg23(b1, b0);
-
- c[0] = rgb565SepTo888(r0, g0, b0);
- c[1] = rgb565SepTo888(r1, g1, b1);
- c[2] = rgb565SepTo888(r2, g2, b2);
- c[3] = rgb565SepTo888(r3, g3, b3);
- } else {
- // Convert to 8 bits
- c[0] = rgb565To888(color0);
- c[1] = rgb565To888(color1);
- }
- }
-
- uint32_t* blockRowPtr = blockPtr;
- for (int y = 0; y < 4; y++, blockRowPtr += stride) {
- // Don't process rows past the botom
- if (base_y + y >= height) {
- break;
- }
-
- int w = min(width - base_x, 4);
- for (int x = 0; x < w; x++) {
- int a = alpha & 0xf;
- alpha >>= 4;
-
- int code = bits & 0x3;
- bits >>= 2;
-
- blockRowPtr[x] = c[code] | (a << 28) | (a << 24);
- }
- }
- }
- }
-}
-
-// Output data as internalformat=GL_RGBA, type=GL_UNSIGNED_BYTE
-static void
-decodeDXT5(const GLvoid *data, int width, int height,
- void *surface, int stride)
-
-{
- init_tables();
-
- uint32_t const *d32 = (uint32_t *)data;
-
- // Specified alphas from the previous block
- uint8_t prev_alpha0 = 0x00;
- uint8_t prev_alpha1 = 0x00;
-
- // Specified colors from the previous block
- uint16_t prev_color0 = 0x0000;
- uint16_t prev_color1 = 0x0000;
-
- // Alpha table for the current block
- uint8_t a[8];
- a[0] = a[1] = a[2] = a[3] = a[4] = a[5] = a[6] = a[7] = 0;
-
- // Color table for the current block
- uint32_t c[4];
- c[0] = c[1] = c[2] = c[3] = 0;
-
- int good_a5 = 0;
- int bad_a5 = 0;
- int good_a6 = 0;
- int bad_a6 = 0;
- int good_a7 = 0;
- int bad_a7 = 0;
-
- uint32_t* rowPtr = (uint32_t*)surface;
- for (int base_y = 0; base_y < height; base_y += 4, rowPtr += 4*stride) {
- uint32_t *blockPtr = rowPtr;
- for (int base_x = 0; base_x < width; base_x += 4, blockPtr += 4) {
-
-#if __BYTE_ORDER == __BIG_ENDIAN
- uint32_t alphahi = *d32++;
- uint32_t alphalo = *d32++;
- alphahi = swap(alphahi);
- alphalo = swap(alphalo);
-#else
- uint32_t alphalo = *d32++;
- uint32_t alphahi = *d32++;
-#endif
-
- uint32_t colors = *d32++;
- uint32_t bits = *d32++;
-
-#if __BYTE_ORDER == __BIG_ENDIANx
- colors = swap(colors);
- bits = swap(bits);
-#endif
-
- uint64_t alpha = ((uint64_t)alphahi << 32) | alphalo;
- uint64_t alpha0 = alpha & 0xff;
- alpha >>= 8;
- uint64_t alpha1 = alpha & 0xff;
- alpha >>= 8;
-
- if (alpha0 != prev_alpha0 || alpha1 != prev_alpha1) {
- prev_alpha0 = alpha0;
- prev_alpha1 = alpha1;
-
- a[0] = alpha0;
- a[1] = alpha1;
- int a01 = alpha0 + alpha1 - 1;
- if (alpha0 > alpha1) {
- a[2] = div7(6*alpha0 + alpha1);
- a[4] = div7(4*alpha0 + 3*alpha1);
- a[6] = div7(2*alpha0 + 5*alpha1);
-
- // Use symmetry to derive half of the values
- // A few values will be off by 1 (~.5%)
- // Alternate which values are computed directly
- // and which are derived to try to reduce bias
- a[3] = a01 - a[6];
- a[5] = a01 - a[4];
- a[7] = a01 - a[2];
- } else {
- a[2] = div5(4*alpha0 + alpha1);
- a[4] = div5(2*alpha0 + 3*alpha1);
- a[3] = a01 - a[4];
- a[5] = a01 - a[2];
- a[6] = 0x00;
- a[7] = 0xff;
- }
- }
-
- // Raw colors
- uint16_t color0 = colors & 0xffff;
- uint16_t color1 = colors >> 16;
-
- // If the new block has the same base colors as the
- // previous one, we don't need to recompute the color
- // table c[]
- if (color0 != prev_color0 || color1 != prev_color1) {
- // Store raw colors for comparison with next block
- prev_color0 = color0;
- prev_color1 = color1;
-
- int bbits = bits >> 1;
- bool has2 = ((bbits & ~bits) & 0x55555555) != 0;
- bool has3 = ((bbits & bits) & 0x55555555) != 0;
-
- if (has2 || has3) {
- int r0 = red(color0);
- int g0 = green(color0);
- int b0 = blue(color0);
-
- int r1 = red(color1);
- int g1 = green(color1);
- int b1 = blue(color1);
-
- int r2 = avg23(r0, r1);
- int g2 = avg23(g0, g1);
- int b2 = avg23(b0, b1);
-
- int r3 = avg23(r1, r0);
- int g3 = avg23(g1, g0);
- int b3 = avg23(b1, b0);
-
- c[0] = rgb565SepTo888(r0, g0, b0);
- c[1] = rgb565SepTo888(r1, g1, b1);
- c[2] = rgb565SepTo888(r2, g2, b2);
- c[3] = rgb565SepTo888(r3, g3, b3);
- } else {
- // Convert to 8 bits
- c[0] = rgb565To888(color0);
- c[1] = rgb565To888(color1);
- }
- }
-
- uint32_t* blockRowPtr = blockPtr;
- for (int y = 0; y < 4; y++, blockRowPtr += stride) {
- // Don't process rows past the botom
- if (base_y + y >= height) {
- break;
- }
-
- int w = min(width - base_x, 4);
- for (int x = 0; x < w; x++) {
- int acode = alpha & 0x7;
- alpha >>= 3;
-
- int code = bits & 0x3;
- bits >>= 2;
-
- blockRowPtr[x] = c[code] | (a[acode] << 24);
- }
- }
- }
- }
-}
-
-/*
- * Decode a DXT-compressed texture into memory. DXT textures consist of
- * a series of 4x4 pixel blocks in left-to-right, top-down order.
- * The number of blocks is given by ceil(width/4)*ceil(height/4).
- *
- * 'data' points to the texture data. 'width' and 'height' indicate the
- * dimensions of the texture. We assume width and height are >= 0 but
- * do not require them to be powers of 2 or divisible by any factor.
- *
- * The output is written to 'surface' with each scanline separated by
- * 'stride' 2- or 4-byte words.
- *
- * 'format' indicates the type of compression and must be one of the following:
- *
- * GL_COMPRESSED_RGB_S3TC_DXT1_EXT:
- * The output is written as 5/6/5 opaque RGB (16 bit words).
- * 8 bytes are read from 'data' for each block.
- *
- * GL_COMPRESSED_RGBA_S3TC_DXT1_EXT
- * The output is written as 5/5/5/1 RGBA (16 bit words)
- * 8 bytes are read from 'data' for each block.
- *
- * GL_COMPRESSED_RGBA_S3TC_DXT3_EXT
- * GL_COMPRESSED_RGBA_S3TC_DXT5_EXT
- * The output is written as 8/8/8/8 ARGB (32 bit words)
- * 16 bytes are read from 'data' for each block.
- */
-void
-decodeDXT(const GLvoid *data, int width, int height,
- void *surface, int stride, int format)
-{
-#if TIMING
- struct timeval start_t, end_t;
- struct timezone tz;
-
- gettimeofday(&start_t, &tz);
-#endif
-
- switch (format) {
- case GL_COMPRESSED_RGB_S3TC_DXT1_EXT:
- decodeDXT1(data, width, height, surface, stride, false);
- break;
-
- case GL_COMPRESSED_RGBA_S3TC_DXT1_EXT:
- decodeDXT1(data, width, height, surface, stride, true);
- break;
-
- case GL_COMPRESSED_RGBA_S3TC_DXT3_EXT:
- decodeDXT3(data, width, height, surface, stride);
- break;
-
- case GL_COMPRESSED_RGBA_S3TC_DXT5_EXT:
- decodeDXT5(data, width, height, surface, stride);
- break;
- }
-
-#if TIMING
- gettimeofday(&end_t, &tz);
- long usec = (end_t.tv_sec - start_t.tv_sec)*1000000 +
- (end_t.tv_usec - start_t.tv_usec);
-
- printf("Loaded w=%d h=%d in %ld usec\n", width, height, usec);
-#endif
-}
-
-} // namespace android
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