1/*
2 * Mesa 3-D graphics library
3 *
4 * Copyright (C) 1999-2008  Brian Paul   All Rights Reserved.
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a
7 * copy of this software and associated documentation files (the "Software"),
8 * to deal in the Software without restriction, including without limitation
9 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
10 * and/or sell copies of the Software, and to permit persons to whom the
11 * Software is furnished to do so, subject to the following conditions:
12 *
13 * The above copyright notice and this permission notice shall be included
14 * in all copies or substantial portions of the Software.
15 *
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
17 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
20 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
21 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
22 * OTHER DEALINGS IN THE SOFTWARE.
23 */
24
25
26/**
27 * \file texcompress_fxt1.c
28 * GL_3DFX_texture_compression_FXT1 support.
29 */
30
31
32#include "errors.h"
33#include "glheader.h"
34
35#include "image.h"
36#include "macros.h"
37#include "mipmap.h"
38#include "texcompress.h"
39#include "texcompress_fxt1.h"
40#include "texstore.h"
41#include "mtypes.h"
42#include "util/format/u_format_fxt1.h"
43
44/**
45 * Compress the user's image to either FXT1_RGB or FXT1_RGBA.
46 */
47GLboolean
48_mesa_texstore_fxt1(TEXSTORE_PARAMS)
49{
50   const uint8_t *pixels;
51   int32_t srcRowStride;
52   uint8_t *dst;
53   const uint8_t *tempImage = NULL;
54
55   assert(dstFormat == MESA_FORMAT_RGB_FXT1 || dstFormat == MESA_FORMAT_RGBA_FXT1);
56
57   if (srcFormat != GL_RGBA ||
58       srcType != GL_UNSIGNED_BYTE ||
59       ctx->_ImageTransferState ||
60       srcPacking->SwapBytes) {
61      /* convert image to RGBA/uint8_t */
62      uint8_t *tempImageSlices[1];
63      int rgbaRowStride = 4 * srcWidth * sizeof(uint8_t);
64      tempImage = malloc(srcWidth * srcHeight * 4 * sizeof(uint8_t));
65      if (!tempImage)
66         return GL_FALSE; /* out of memory */
67      tempImageSlices[0] = (uint8_t *) tempImage;
68      _mesa_texstore(ctx, dims,
69                     baseInternalFormat,
70                     MESA_FORMAT_RGBA_UNORM8,
71                     rgbaRowStride, tempImageSlices,
72                     srcWidth, srcHeight, srcDepth,
73                     srcFormat, srcType, srcAddr,
74                     srcPacking);
75      pixels = tempImage;
76      srcRowStride = 4 * srcWidth;
77      srcFormat = GL_RGBA;
78   }
79   else {
80      pixels = _mesa_image_address2d(srcPacking, srcAddr, srcWidth, srcHeight,
81                                     srcFormat, srcType, 0, 0);
82
83      srcRowStride = _mesa_image_row_stride(srcPacking, srcWidth, srcFormat,
84                                            srcType) / sizeof(uint8_t);
85   }
86
87   dst = dstSlices[0];
88
89   if (dstFormat == MESA_FORMAT_RGB_FXT1)
90      util_format_fxt1_rgb_pack_rgba_8unorm(dst, dstRowStride, pixels, srcRowStride, srcWidth, srcHeight);
91   else
92      util_format_fxt1_rgba_pack_rgba_8unorm(dst, dstRowStride, pixels, srcRowStride, srcWidth, srcHeight);
93
94   free((void*) tempImage);
95
96   return GL_TRUE;
97}
98
99static void
100fetch_rgb_fxt1(const uint8_t *map,
101               int32_t rowStride, int32_t i, int32_t j, float *texel)
102{
103   map += rowStride * (i / 8);
104   map += 16 * (j / 4);
105   util_format_fxt1_rgb_fetch_rgba(texel, map, i & 7, j & 3);
106}
107
108
109static void
110fetch_rgba_fxt1(const uint8_t *map,
111                int32_t rowStride, int32_t i, int32_t j, float *texel)
112{
113   map += rowStride * (i / 8);
114   map += 16 * (j / 4);
115   util_format_fxt1_rgba_fetch_rgba(texel, map, i & 7, j & 3);
116}
117
118
119compressed_fetch_func
120_mesa_get_fxt_fetch_func(mesa_format format)
121{
122   switch (format) {
123   case MESA_FORMAT_RGB_FXT1:
124      return fetch_rgb_fxt1;
125   case MESA_FORMAT_RGBA_FXT1:
126      return fetch_rgba_fxt1;
127   default:
128      return NULL;
129   }
130}
131