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intel/common: Improve the comments for sample positions

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These are pulled directly from brw_multisample_state.h

Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
This commit is contained in:
Jason Ekstrand 2017-08-17 19:05:30 -07:00
parent f16382d35b
commit 9cec35579c
1 changed files with 65 additions and 0 deletions
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65
src/intel/common/gen_sample_positions.h
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@ -23,16 +23,38 @@
#ifndef GEN_SAMPLE_POSITIONS_H
#define GEN_SAMPLE_POSITIONS_H
/*
* This file defines the standard multisample positions used by both GL and
* Vulkan. These correspond to the Vulkan "standard sample locations".
*/
/**
* 1x MSAA has a single sample at the center: (0.5, 0.5) -> (0x8, 0x8).
*/
#define GEN_SAMPLE_POS_1X(prefix) \
prefix##0XOffset = 0.5; \
prefix##0YOffset = 0.5;
/**
* 2x MSAA sample positions are (0.25, 0.25) and (0.75, 0.75):
* 4 c
* 4 0
* c 1
*/
#define GEN_SAMPLE_POS_2X(prefix) \
prefix##0XOffset = 0.25; \
prefix##0YOffset = 0.25; \
prefix##1XOffset = 0.75; \
prefix##1YOffset = 0.75;
/**
* Sample positions:
* 2 6 a e
* 2 0
* 6 1
* a 2
* e 3
*/
#define GEN_SAMPLE_POS_4X(prefix) \
prefix##0XOffset = 0.375; \
prefix##0YOffset = 0.125; \
@ -43,6 +65,28 @@ prefix##2YOffset = 0.625; \
prefix##3XOffset = 0.625; \
prefix##3YOffset = 0.875;
/**
* Sample positions:
*
* From the Ivy Bridge PRM, Vol2 Part1 p304 (3DSTATE_MULTISAMPLE:
* Programming Notes):
* "When programming the sample offsets (for NUMSAMPLES_4 or _8 and
* MSRASTMODE_xxx_PATTERN), the order of the samples 0 to 3 (or 7
* for 8X) must have monotonically increasing distance from the
* pixel center. This is required to get the correct centroid
* computation in the device."
*
* Sample positions:
* 1 3 5 7 9 b d f
* 1 7
* 3 3
* 5 0
* 7 5
* 9 2
* b 1
* d 4
* f 6
*/
#define GEN_SAMPLE_POS_8X(prefix) \
prefix##0XOffset = 0.5625; \
prefix##0YOffset = 0.3125; \
@ -61,6 +105,27 @@ prefix##6YOffset = 0.9375; \
prefix##7XOffset = 0.9375; \
prefix##7YOffset = 0.0625;
/**
* Sample positions:
*
* 0 1 2 3 4 5 6 7 8 9 a b c d e f
* 0 15
* 1 9
* 2 10
* 3 7
* 4 13
* 5 1
* 6 4
* 7 3
* 8 12
* 9 0
* a 2
* b 6
* c 11
* d 5
* e 8
* f 14
*/
#define GEN_SAMPLE_POS_16X(prefix) \
prefix##0XOffset = 0.5625; \
prefix##0YOffset = 0.5625; \