X-Git-Url: http://git.tdb.fi/?a=blobdiff_plain;f=source%2Fcore%2Ftexture.cpp;h=a65715e716a26c6fbc283655c37c0382fc795010;hb=3efe3bab1c8290bd49a957ebec0ad97e58a35fcf;hp=73dd39b6c5cf79a5662a31ff3846b8981fc677b6;hpb=d0df3ba82b187705331e2cc55d515c2d44e7f466;p=libs%2Fgl.git

diff --git a/source/core/texture.cpp b/source/core/texture.cpp
index 73dd39b6..a65715e7 100644
--- a/source/core/texture.cpp
+++ b/source/core/texture.cpp
@@ -34,6 +34,48 @@ void Texture::set_format(PixelFormat fmt)
 	swizzle = swiz;
 }
 
+unsigned Texture::count_levels(unsigned size)
+{
+	unsigned n = 0;
+	for(; size; size>>=1, ++n) ;
+	return n;
+}
+
+void Texture::stage_pixels(void *staging, const void *data, size_t count)
+{
+	if(swizzle==RGBA_TO_RGB)
+	{
+		const uint32_t *src = static_cast<const uint32_t *>(data);
+		uint32_t *dst = static_cast<uint32_t *>(staging);
+		size_t i = 0;
+		for(; i+3<count; i+=4)
+		{
+			dst[0] = src[0]|0xFF000000;
+			dst[1] = (src[0]>>24)|(src[1]<<8)|0xFF000000;
+			dst[2] = (src[1]>>16)|(src[2]<<16)|0xFF000000;
+			dst[3] = (src[2]>>8)|0xFF000000;
+			src += 3;
+			dst += 4;
+		}
+
+		if(i<count)
+		{
+			const uint8_t *src_bytes = reinterpret_cast<const uint8_t *>(src);
+			for(; i<count; ++i)
+			{
+				*dst++ = src_bytes[0]|(src_bytes[1]<<8)|(src_bytes[2]<<16)|0xFF000000;
+				src_bytes += 3;
+			}
+		}
+	}
+	else
+	{
+		const char *src = static_cast<const char *>(data);
+		size_t data_size = count*get_pixel_size(storage_fmt);
+		copy(src, src+data_size, static_cast<char *>(staging));
+	}
+}
+
 void Texture::load_image(const string &fn, unsigned lv)
 {
 	Graphics::Image img;