diff options
Diffstat (limited to 'src/intel/common')
| -rw-r--r-- | src/intel/common/gen_sample_positions.h | 65 |
1 files changed, 65 insertions, 0 deletions
diff --git a/src/intel/common/gen_sample_positions.h b/src/intel/common/gen_sample_positions.h index b86a7d84366..f0ce95dd1fb 100644 --- a/src/intel/common/gen_sample_positions.h +++ b/src/intel/common/gen_sample_positions.h @@ -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; \ |