Mesa (master): bifrost: Document d3d/gl comparison control bit
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Mon Jul 27 17:09:32 UTC 2020
Module: Mesa
Branch: master
Commit: 1a168c90a01d51582f992792b0caf902998de753
URL: http://cgit.freedesktop.org/mesa/mesa/commit/?id=1a168c90a01d51582f992792b0caf902998de753
Author: Chris Forbes <chrisforbes at google.com>
Date: Sun Jul 26 10:33:06 2020 -0700
bifrost: Document d3d/gl comparison control bit
Signed-off-by: Chris Forbes <chrisforbes at google.com>
Reviewed-by: Alyssa Rosenzweig <alyssa.rosenzweig at collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6079>
---
src/panfrost/bifrost/bifrost.h | 8 +++++---
1 file changed, 5 insertions(+), 3 deletions(-)
diff --git a/src/panfrost/bifrost/bifrost.h b/src/panfrost/bifrost/bifrost.h
index fa07b749e5e..0864b3a497e 100644
--- a/src/panfrost/bifrost/bifrost.h
+++ b/src/panfrost/bifrost/bifrost.h
@@ -447,6 +447,7 @@ enum bifrost_fcmp_cond {
BIFROST_OLE = 5,
};
+/* "gl" version produces 0/1. "d3d" version produces 0/~0 */
#define BIFROST_FMA_OP_FCMP_GL (0x48000 >> 13)
#define BIFROST_FMA_OP_FCMP_D3D (0x4c000 >> 13)
@@ -473,6 +474,7 @@ struct bifrost_add_fcmp {
unsigned op : 6;
} __attribute__((packed));
+/* "gl" version produces 0/1. "d3d" version produces 0/~0 */
#define BIFROST_FMA_OP_FCMP_GL_16 (0xc8000 >> 13)
#define BIFROST_FMA_OP_FCMP_D3D_16 (0xcc000 >> 13)
@@ -521,7 +523,7 @@ struct bifrost_fma_icmp32 {
unsigned src1 : 3;
enum bifrost_icmp_cond cond : 3;
unsigned unk1 : 1; /* set */
- unsigned d3d : 1;
+ unsigned d3d : 1; /* if set, true is ~0. otherwise, true is 1 */
unsigned op : 12;
} __attribute__((packed));
@@ -541,7 +543,7 @@ struct bifrost_add_icmp {
unsigned src1 : 3;
enum bifrost_icmp_cond cond : 3;
unsigned sz : 1; /* 1 for 32, 0 for 8 */
- unsigned d3d : 1;
+ unsigned d3d : 1; /* if set, true is ~0. otherwise, true is 1 */
unsigned op : 9;
} __attribute__((packed));
@@ -550,7 +552,7 @@ struct bifrost_add_icmp16 {
unsigned src1 : 3;
unsigned src0_swizzle : 2;
unsigned src1_swizzle : 2;
- unsigned d3d : 1;
+ unsigned d3d : 1; /* if set, true is ~0. otherwise, true is 1 */
enum bifrost_icmp_cond cond : 3;
unsigned op : 6;
} __attribute__((packed));
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