1 files changed, 62 insertions, 0 deletions
diff --git a/drivers/squish/image_compress_squish.cpp b/drivers/squish/image_compress_squish.cpp
new file mode 100644
index 000000000..1d71f51db
--- /dev/null
+++ b/drivers/squish/image_compress_squish.cpp
@@ -0,0 +1,62 @@
+#include "image_compress_squish.h"
+#include "squish/squish.h"
+#include "print_string.h"
+
+void image_compress_squish(Image *p_image) {
+
+	int w=p_image->get_width();
+	int h=p_image->get_height();
+
+	if (p_image->get_mipmaps() == 0) {
+		ERR_FAIL_COND( !w || w % 4 != 0);
+		ERR_FAIL_COND( !h || h % 4 != 0);
+	} else {
+		ERR_FAIL_COND( !w || w !=nearest_power_of_2(w) );
+		ERR_FAIL_COND( !h || h !=nearest_power_of_2(h) );
+	};
+
+	if (p_image->get_format()>=Image::FORMAT_BC1)
+		return; //do not compress, already compressed
+
+
+	Image::AlphaMode alpha = p_image->detect_alpha();
+	Image::Format target_format;
+	int shift=0;
+	int squish_comp=squish::kColourRangeFit;
+	switch(alpha) {
+
+		case Image::ALPHA_NONE: target_format = Image::FORMAT_BC1; shift=1; squish_comp|=squish::kDxt1; break;
+		case Image::ALPHA_BIT: target_format = Image::FORMAT_BC2; squish_comp|=squish::kDxt3; break;
+		case Image::ALPHA_BLEND: target_format = Image::FORMAT_BC3; squish_comp|=squish::kDxt5; break;
+	}
+
+
+	p_image->convert(Image::FORMAT_RGBA); //always expects rgba
+
+	int mm_count = p_image->get_mipmaps();
+
+	DVector<uint8_t> data;
+	int target_size = Image::get_image_data_size(w,h,target_format,mm_count);
+	data.resize(target_size);
+
+	DVector<uint8_t>::Read rb = p_image->get_data().read();
+	DVector<uint8_t>::Write wb = data.write();
+
+	int dst_ofs=0;
+
+	for(int i=0;i<=mm_count;i++) {
+
+		int src_ofs = p_image->get_mipmap_offset(i);
+		squish::CompressImage( &rb[src_ofs],w,h,&wb[dst_ofs],squish_comp);
+		dst_ofs+=(MAX(4,w)*MAX(4,h))>>shift;
+		w>>=1;
+		h>>=1;
+	}
+
+	rb = DVector<uint8_t>::Read();
+	wb = DVector<uint8_t>::Write();
+
+	p_image->create(p_image->get_width(),p_image->get_height(),p_image->get_mipmaps(),target_format,data);
+
+}
+