diff options
| author | Brian Paul <brianp@vmware.com> | 2009-08-19 13:14:15 -0600 |
|---|---|---|
| committer | Brian Paul <brianp@vmware.com> | 2009-08-19 13:14:15 -0600 |
| commit | f03ef54d195132e3d28fb03df7809112d7366598 (patch) | |
| tree | 407c2cc0e19e76ba89c426b47e1ab3d61bbf0de9 | |
| parent | 39644e32bee81a5b52e1e1c860164ba1ac408f6d (diff) | |
llvmpipe: comments about blend generator
| -rw-r--r-- | src/gallium/drivers/llvmpipe/lp_state_blend.c | 16 |
1 files changed, 11 insertions, 5 deletions
diff --git a/src/gallium/drivers/llvmpipe/lp_state_blend.c b/src/gallium/drivers/llvmpipe/lp_state_blend.c index d1c8536acf..d0cdcd8c8d 100644 --- a/src/gallium/drivers/llvmpipe/lp_state_blend.c +++ b/src/gallium/drivers/llvmpipe/lp_state_blend.c @@ -45,6 +45,12 @@ #include "lp_bld_debug.h" +/** + * Generate blending code according to blend->base state. + * The blend function will look like: + * blend(mask, src_color, constant color, dst_color) + * dst_color will be modified and contain the result of the blend func. + */ static void blend_generate(struct llvmpipe_screen *screen, struct lp_blend_state *blend) @@ -69,11 +75,11 @@ blend_generate(struct llvmpipe_screen *screen, unsigned i; type.value = 0; - type.floating = FALSE; - type.sign = FALSE; - type.norm = TRUE; - type.width = 8; - type.length = 16; + type.floating = FALSE; /* values are integers */ + type.sign = FALSE; /* values are unsigned */ + type.norm = TRUE; /* values are in [0,1] or [-1,1] */ + type.width = 8; /* 8-bit ubyte values */ + type.length = 16; /* 16 elements per vector */ vec_type = lp_build_vec_type(type); int_vec_type = lp_build_int_vec_type(type); |