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/* $Id$ */
/*
libg3d - 3D object loading library
Copyright (C) 2005-2009 Markus Dahms <mad@automagically.de>
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <stdio.h>
#include <string.h>
#include <g3d/types.h>
#include <g3d/stream.h>
#include <g3d/iff.h>
static gboolean decode_dxt1(G3DImage *image, G3DStream *stream);
EAPI
gboolean plugin_load_image_from_stream(G3DContext *context, G3DStream *stream,
G3DImage *image, gpointer user_data)
{
guint32 magic, size, flags, depth;
guint32 pfsize, pfflags, pffourcc, pfbpp;
guint32 pfrmask, pfgmask, pfbmask, pfamask;
guint32 caps1, caps2;
gchar *sfourcc;
magic = g3d_stream_read_int32_be(stream);
if(magic != G3D_IFF_MKID('D','D','S',' ')) {
g_warning("%s is not a DDS file", stream->uri);
return FALSE;
}
image->name = g_strdup(stream->uri);
size = g3d_stream_read_int32_le(stream);
flags = g3d_stream_read_int32_le(stream);
image->height = g3d_stream_read_int32_le(stream);
image->width = g3d_stream_read_int32_le(stream);
g3d_stream_read_int32_le(stream); /* pitch or linesize */
depth = g3d_stream_read_int32_le(stream);
g3d_stream_read_int32_le(stream); /* num mipmaps */
g3d_stream_skip(stream, 44);
pfsize = g3d_stream_read_int32_le(stream);
pfflags = g3d_stream_read_int32_le(stream);
pffourcc = g3d_stream_read_int32_be(stream);
sfourcc = g3d_iff_id_to_text(pffourcc);
pfbpp = g3d_stream_read_int32_le(stream);
pfrmask = g3d_stream_read_int32_le(stream);
pfgmask = g3d_stream_read_int32_le(stream);
pfbmask = g3d_stream_read_int32_le(stream);
pfamask = g3d_stream_read_int32_le(stream);
caps1 = g3d_stream_read_int32_le(stream);
caps2 = g3d_stream_read_int32_le(stream);
g3d_stream_skip(stream, 12);
#if DEBUG > 0
g_debug("DDS: %ux%u %s 0x%08x", image->width, image->height,
sfourcc, pfflags);
g_debug("DDS: masks: 0x%04x, 0x%04x, 0x%04x, 0x%04x",
pfrmask, pfgmask, pfbmask, pfamask);
#endif
image->pixeldata = g_new0(guint8, image->width * image->height * 4);
switch(pffourcc) {
case G3D_IFF_MKID('D','X','T','1'):
decode_dxt1(image, stream);
break;
default:
g_warning("DDS: unsupported FOURCC: %s", sfourcc);
}
g_free(sfourcc);
return TRUE;
}
EAPI
gchar *plugin_description(G3DContext *context)
{
return g_strdup("DDS textures.\n"
"Author: Markus Dahms");
}
EAPI
gchar **plugin_extensions(G3DContext *context)
{
return g_strsplit("dds", ":", 0);
}
/*****************************************************************************/
static void decode_rgb565(guint16 c, G3DFloat *r, G3DFloat *g, G3DFloat *b)
{
*r = ((c & 0xF800) >> 11) / 32.0;
*g = ((c & 0x07E0) >> 5) / 64.0;
*b = (c & 0x001F) / 32.0;
}
static gboolean decode_dxt1(G3DImage *image, G3DStream *stream)
{
gint32 x, y, i, j;
guint32 index;
G3DFloat r, g, b, r1, r2, g1, g2, b1, b2;
guint8 line, v2;
for(y = 0; y < image->height; y += 4) {
for(x = 0; x < image->width; x += 4) {
decode_rgb565(g3d_stream_read_int16_le(stream), &r1, &g1, &b1);
decode_rgb565(g3d_stream_read_int16_le(stream), &r2, &g2, &b2);
for(j = 0; j < 4; j ++) {
line = g3d_stream_read_int8(stream);
for(i = 0; i < 4; i ++) {
v2 = line & 0x3;
line >>= 2;
r = r1 + ((r2 - r1) / 3.0) * v2;
g = g1 + ((g2 - g1) / 3.0) * v2;
b = b1 + ((b2 - b1) / 3.0) * v2;
index = ((image->height - 4) - y + j) *
image->width + x + i;
image->pixeldata[index * 4 + 0] = r * 255.0;
image->pixeldata[index * 4 + 1] = g * 255.0;
image->pixeldata[index * 4 + 2] = b * 255.0;
image->pixeldata[index * 4 + 3] = 0xFF;
}
}
}
}
return TRUE;
}
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