+ unsigned db_eqaa = S_028804_HIGH_QUALITY_INTERSECTIONS(1) |
+ S_028804_INCOHERENT_EQAA_READS(1) |
+ S_028804_INTERPOLATE_COMP_Z(1) |
+ S_028804_STATIC_ANCHOR_ASSOCIATIONS(1);
+ unsigned coverage_samples, color_samples, z_samples;
+
+ /* S: Coverage samples (up to 16x):
+ * - Scan conversion samples (PA_SC_AA_CONFIG.MSAA_NUM_SAMPLES)
+ * - CB FMASK samples (CB_COLORi_ATTRIB.NUM_SAMPLES)
+ *
+ * Z: Z/S samples (up to 8x, must be <= coverage samples and >= color samples):
+ * - Value seen by DB (DB_Z_INFO.NUM_SAMPLES)
+ * - Value seen by CB, must be correct even if Z/S is unbound (DB_EQAA.MAX_ANCHOR_SAMPLES)
+ * # Missing samples are derived from Z planes if Z is compressed (up to 16x quality), or
+ * # from the closest defined sample if Z is uncompressed (same quality as the number of
+ * # Z samples).
+ *
+ * F: Color samples (up to 8x, must be <= coverage samples):
+ * - CB color samples (CB_COLORi_ATTRIB.NUM_FRAGMENTS)
+ * - PS iter samples (DB_EQAA.PS_ITER_SAMPLES)
+ *
+ * Can be anything between coverage and color samples:
+ * - SampleMaskIn samples (PA_SC_AA_CONFIG.MSAA_EXPOSED_SAMPLES)
+ * - SampleMaskOut samples (DB_EQAA.MASK_EXPORT_NUM_SAMPLES)
+ * - Alpha-to-coverage samples (DB_EQAA.ALPHA_TO_MASK_NUM_SAMPLES)
+ * - Occlusion query samples (DB_COUNT_CONTROL.SAMPLE_RATE)
+ * # All are currently set the same as coverage samples.
+ *
+ * If color samples < coverage samples, FMASK has a higher bpp to store an "unknown"
+ * flag for undefined color samples. A shader-based resolve must handle unknowns
+ * or mask them out with AND. Unknowns can also be guessed from neighbors via
+ * an edge-detect shader-based resolve, which is required to make "color samples = 1"
+ * useful. The CB resolve always drops unknowns.
+ *
+ * Sensible AA configurations:
+ * EQAA 16s 8z 8f - might look the same as 16x MSAA if Z is compressed
+ * EQAA 16s 8z 4f - might look the same as 16x MSAA if Z is compressed
+ * EQAA 16s 4z 4f - might look the same as 16x MSAA if Z is compressed
+ * EQAA 8s 8z 8f = 8x MSAA
+ * EQAA 8s 8z 4f - might look the same as 8x MSAA
+ * EQAA 8s 8z 2f - might look the same as 8x MSAA with low-density geometry
+ * EQAA 8s 4z 4f - might look the same as 8x MSAA if Z is compressed
+ * EQAA 8s 4z 2f - might look the same as 8x MSAA with low-density geometry if Z is compressed
+ * EQAA 4s 4z 4f = 4x MSAA
+ * EQAA 4s 4z 2f - might look the same as 4x MSAA with low-density geometry
+ * EQAA 2s 2z 2f = 2x MSAA
+ */
+ if (sctx->framebuffer.nr_samples > 1) {
+ coverage_samples = sctx->framebuffer.nr_samples;
+ color_samples = sctx->framebuffer.nr_color_samples;