Mesa (master): svga: add comment about unsupported blend modes

[Brian Paul]

Module: Mesa
Branch: master
Commit: 93779b87a1b69ed1f49cd18c08edd2d6ecb9196f
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=93779b87a1b69ed1f49cd18c08edd2d6ecb9196f

Author: Brian Paul <brianp at vmware.com>
Date:   Fri Aug 19 09:36:02 2016 -0600

svga: add comment about unsupported blend modes

---

 src/gallium/drivers/svga/svga_pipe_blend.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/gallium/drivers/svga/svga_pipe_blend.c b/src/gallium/drivers/svga/svga_pipe_blend.c
index a9f1c4f..408e175 100644
--- a/src/gallium/drivers/svga/svga_pipe_blend.c
+++ b/src/gallium/drivers/svga/svga_pipe_blend.c
@@ -37,6 +37,9 @@
 static inline unsigned
 svga_translate_blend_factor(const struct svga_context *svga, unsigned factor)
 {
+   /* Note: there is no SVGA3D_BLENDOP_[INV]BLENDFACTORALPHA so
+    * we can't translate PIPE_BLENDFACTOR_[INV_]CONST_ALPHA properly.
+    */
    switch (factor) {
    case PIPE_BLENDFACTOR_ZERO:            return SVGA3D_BLENDOP_ZERO;
    case PIPE_BLENDFACTOR_SRC_ALPHA:       return SVGA3D_BLENDOP_SRCALPHA;