1 files changed, 84 insertions, 0 deletions
diff --git a/src/util/format/u_format_etc.c b/src/util/format/u_format_etc.c
new file mode 100644
index 00000000000..505e57b41f1
--- /dev/null
+++ b/src/util/format/u_format_etc.c
@@ -0,0 +1,84 @@
+#include "pipe/p_compiler.h"
+#include "util/u_debug.h"
+#include "util/u_math.h"
+#include "util/format/u_format_etc.h"
+
+/* define etc1_parse_block and etc. */
+#define UINT8_TYPE uint8_t
+#define TAG(x) x
+#include "../../mesa/main/texcompress_etc_tmp.h"
+#undef TAG
+#undef UINT8_TYPE
+
+void
+util_format_etc1_rgb8_unpack_rgba_8unorm(uint8_t *dst_row, unsigned dst_stride, const uint8_t *src_row, unsigned src_stride, unsigned width, unsigned height)
+{
+   etc1_unpack_rgba8888(dst_row, dst_stride, src_row, src_stride, width, height);
+}
+
+void
+util_format_etc1_rgb8_pack_rgba_8unorm(UNUSED uint8_t *dst_row, UNUSED unsigned dst_stride,
+                                       UNUSED const uint8_t *src_row, UNUSED unsigned src_stride,
+                                       UNUSED unsigned width, UNUSED unsigned height)
+{
+   assert(0);
+}
+
+void
+util_format_etc1_rgb8_unpack_rgba_float(float *dst_row, unsigned dst_stride, const uint8_t *src_row, unsigned src_stride, unsigned width, unsigned height)
+{
+   const unsigned bw = 4, bh = 4, bs = 8, comps = 4;
+   struct etc1_block block;
+   unsigned x, y, i, j;
+
+   for (y = 0; y < height; y += bh) {
+      const uint8_t *src = src_row;
+
+      for (x = 0; x < width; x+= bw) {
+         etc1_parse_block(&block, src);
+
+         for (j = 0; j < bh; j++) {
+            float *dst = dst_row + (y + j) * dst_stride / sizeof(*dst_row) + x * comps;
+            uint8_t tmp[3];
+
+            for (i = 0; i < bw; i++) {
+               etc1_fetch_texel(&block, i, j, tmp);
+               dst[0] = ubyte_to_float(tmp[0]);
+               dst[1] = ubyte_to_float(tmp[1]);
+               dst[2] = ubyte_to_float(tmp[2]);
+               dst[3] = 1.0f;
+               dst += comps;
+            }
+         }
+
+         src += bs;
+      }
+
+      src_row += src_stride;
+   }
+}
+
+void
+util_format_etc1_rgb8_pack_rgba_float(UNUSED uint8_t *dst_row, UNUSED unsigned dst_stride,
+                                      UNUSED const float *src_row, UNUSED unsigned src_stride,
+                                      UNUSED unsigned width, UNUSED unsigned height)
+{
+   assert(0);
+}
+
+void
+util_format_etc1_rgb8_fetch_rgba_float(float *dst, const uint8_t *src, unsigned i, unsigned j)
+{
+   struct etc1_block block;
+   uint8_t tmp[3];
+
+   assert(i < 4 && j < 4); /* check i, j against 4x4 block size */
+
+   etc1_parse_block(&block, src);
+   etc1_fetch_texel(&block, i, j, tmp);
+
+   dst[0] = ubyte_to_float(tmp[0]);
+   dst[1] = ubyte_to_float(tmp[1]);
+   dst[2] = ubyte_to_float(tmp[2]);
+   dst[3] = 1.0f;
+}