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24 #ifndef BRW_MULTISAMPLE_STATE_H
25 #define BRW_MULTISAMPLE_STATE_H
30 * Note: There are no standard multisample positions defined in OpenGL
31 * specifications. Implementations have the freedom to pick the positions
32 * which give plausible results. But the Vulkan specification does define
33 * standard sample positions. So, we decided to pick the same pattern in
34 * OpenGL as in Vulkan to keep it uniform across drivers and also to avoid
35 * breaking applications which rely on this standard pattern.
39 * 1x MSAA has a single sample at the center: (0.5, 0.5) -> (0x8, 0x8).
41 * 2x MSAA sample positions are (0.25, 0.25) and (0.75, 0.75):
47 brw_multisample_positions_1x_2x
= 0x0088cc44;
58 brw_multisample_positions_4x
= 0xae2ae662;
63 * From the Ivy Bridge PRM, Vol2 Part1 p304 (3DSTATE_MULTISAMPLE:
65 * "When programming the sample offsets (for NUMSAMPLES_4 or _8 and
66 * MSRASTMODE_xxx_PATTERN), the order of the samples 0 to 3 (or 7
67 * for 8X) must have monotonically increasing distance from the
68 * pixel center. This is required to get the correct centroid
69 * computation in the device."
83 brw_multisample_positions_8x
[] = { 0x53d97b95, 0xf1bf173d };
88 * 0 1 2 3 4 5 6 7 8 9 a b c d e f
106 static const uint32_t
107 brw_multisample_positions_16x
[] = {
108 0xc75a7599, 0xb3dbad36, 0x2c42816e, 0x10eff408
111 #endif /* BRW_MULTISAMPLE_STATE_H */