Cell: some basic blending code

1 files changed, 62 insertions, 0 deletions

diff --git a/src/mesa/pipe/cell/spu/spu_blend.c b/src/mesa/pipe/cell/spu/spu_blend.c
new file mode 100644
index 00000000000..23ec0eeb451
--- /dev/null
+++ b/src/mesa/pipe/cell/spu/spu_blend.c
@@ -0,0 +1,62 @@
+/**************************************************************************
+ * 
+ * Copyright 2008 Tungsten Graphics, Inc., Cedar Park, Texas.
+ * All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sub license, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ * 
+ * The above copyright notice and this permission notice (including the
+ * next paragraph) shall be included in all copies or substantial portions
+ * of the Software.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
+ * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
+ * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+ * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+ * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ * 
+ **************************************************************************/
+
+
+#include "spu_main.h"
+#include "spu_blend.h"
+#include "spu_colorpack.h"
+
+
+void
+blend_quad(uint itx, uint ity, vector float colors[4])
+{
+   /* simple SRC_ALPHA, ONE_MINUS_SRC_ALPHA blending */
+   vector float fbc00 = spu_unpack_color(spu.ctile.ui[ity][itx]);
+   vector float fbc01 = spu_unpack_color(spu.ctile.ui[ity][itx+1]);
+   vector float fbc10 = spu_unpack_color(spu.ctile.ui[ity+1][itx]);
+   vector float fbc11 = spu_unpack_color(spu.ctile.ui[ity+1][itx+1]);
+
+   vector float alpha00 = spu_splats(spu_extract(colors[0], 3));
+   vector float alpha01 = spu_splats(spu_extract(colors[1], 3));
+   vector float alpha10 = spu_splats(spu_extract(colors[2], 3));
+   vector float alpha11 = spu_splats(spu_extract(colors[3], 3));
+
+   vector float one_minus_alpha00 = spu_sub(spu_splats(1.0f), alpha00);
+   vector float one_minus_alpha01 = spu_sub(spu_splats(1.0f), alpha01);
+   vector float one_minus_alpha10 = spu_sub(spu_splats(1.0f), alpha10);
+   vector float one_minus_alpha11 = spu_sub(spu_splats(1.0f), alpha11);
+
+   colors[0] = spu_add(spu_mul(colors[0], alpha00),
+                       spu_mul(fbc00, one_minus_alpha00));
+   colors[1] = spu_add(spu_mul(colors[1], alpha01),
+                       spu_mul(fbc01, one_minus_alpha01));
+   colors[2] = spu_add(spu_mul(colors[2], alpha10),
+                       spu_mul(fbc10, one_minus_alpha10));
+   colors[3] = spu_add(spu_mul(colors[3], alpha11),
+                       spu_mul(fbc11, one_minus_alpha11));
+}
+