Mesa (gallium-llvmpipe): llvmpipe: comments about blend generator
Brian Paul
brianp at kemper.freedesktop.org
Wed Aug 19 19:19:30 UTC 2009
Module: Mesa
Branch: gallium-llvmpipe
Commit: f03ef54d195132e3d28fb03df7809112d7366598
URL: http://cgit.freedesktop.org/mesa/mesa/commit/?id=f03ef54d195132e3d28fb03df7809112d7366598
Author: Brian Paul <brianp at vmware.com>
Date: Wed Aug 19 13:14:15 2009 -0600
llvmpipe: comments about blend generator
---
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 d1c8536..d0cdcd8 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);
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