From 56dadb41d6644c602b494059288410b1872b0fa6 Mon Sep 17 00:00:00 2001
From: Arthur Hanson Rasmusson <arthur@vgpu.io>
Date: Sat, 7 Nov 2026 01:03:58 -0500
Subject: vgsp-gl: raster blend/alpha/cull/point/ZCULL neutral A/B state

---
 kernel/gsp_phys_booter.c | 50 +++++++++++++++++++++++++++++++++++++++++++++++-
 kernel/gsp_phys_gpu.h    |  6 ++++++
 2 files changed, 55 insertions(+), 1 deletion(-)

(limited to 'kernel')

diff --git a/kernel/gsp_phys_booter.c b/kernel/gsp_phys_booter.c
index 5f8df5e..43e4e11 100644
--- a/kernel/gsp_phys_booter.c
+++ b/kernel/gsp_phys_booter.c
@@ -18736,6 +18736,33 @@ bool gsp_phys_rmcall_gr_stale_write_value(void)
 	return READ_ONCE(gsp_phys_gr_stale_write);
 }
 
+/*
+ * SESSION 155 CONT 22: extra raster/store-disable A/B. The client's window
+ * carries none of the blend/alpha/cull/point/ZCULL channel state; if the
+ * replay's defaults kill fragments (blend discard, cull, alpha, ZCULL), no
+ * color reaches the ROP. Emit the neutral disabling form ahead of the
+ * window (constant runs):
+ *   0x12e4 SET_BLEND_STATE_PER_TARGET   <- 0
+ *   0x1e00 SET_BLEND_PER_TARGET_SEPARATE<- 0
+ *   0x12ec SET_ALPHA_TEST               <- 0
+ *   0x1308 D3D_SET_CULL_MODE            <- 0 (no cull)
+ *   0x1520 SET_POINT_SPRITE             <- 0
+ *   0x02e4 SET_ZCULL_ROP_BYPASS         <- 0
+ *   0x02e8 SET_ZCULL_SUBREGION          <- 0
+ *   0x02fc ASSIGN_ZCULL_SUBREGIONS      <- 0
+ * Default 0 = legacy bytes.
+ */
+static bool gsp_phys_rmcall_gr_raster_extra;
+module_param_named(sema_gl_raster_extra, gsp_phys_rmcall_gr_raster_extra,
+		   bool, 0644);
+MODULE_PARM_DESC(sema_gl_raster_extra,
+	"Emit blend/alpha/cull/point/ZCULL neutral-disabled state ahead of replayed 3D windows (default 0; A/B)");
+
+bool gsp_phys_rmcall_gr_raster_extra_value(void)
+{
+	return READ_ONCE(gsp_phys_rmcall_gr_raster_extra);
+}
+
 /*
  * SESSION 155 CONT 15: where the synthesized GS SPH lives inside the
  * program-family page. 0 = family+0x780 (below the window's own VTG bind
@@ -29834,6 +29861,8 @@ gr_page_unmapped:
 				READ_ONCE(gsp_phys_rmcall_gr_sph_gs_mode);
 			bool emit_raster =
 				READ_ONCE(gsp_phys_rmcall_gr_raster_pre);
+			bool emit_raster_extra =
+				READ_ONCE(gsp_phys_rmcall_gr_raster_extra);
 			u32 gs_addr = READ_ONCE(gsp_phys_rmcall_gr_sph_gs_addr);
 			u32 gs_ctx = READ_ONCE(gsp_phys_rmcall_gr_sph_gs_ctx);
 
@@ -30003,6 +30032,24 @@ gr_page_unmapped:
 					     (0x0e00u >> 2);
 				in[nfin++] = 0u;
 			}
+			/*
+			 * SESSION 155 CONT 22: neutral blend/alpha/cull/
+			 * point/ZCULL state (see sema_gl_raster_extra).
+			 */
+			if (emit_raster_extra) {
+				static const u32 rxm[] = {
+					0x12e4u, 0x1e00u, 0x12ecu, 0x1308u,
+					0x1520u, 0x02e4u, 0x02e8u, 0x02fcu,
+				};
+				u32 ri6;
+
+				for (ri6 = 0; ri6 < 8u; ri6++) {
+					in[nfin++] = 0x20000000u |
+						     (1u << 16) |
+						     (rxm[ri6] >> 2);
+					in[nfin++] = 0u;
+				}
+			}
 
 			/*
 			 * SESSION 153-CONTINUED-89: the client's init-push
@@ -30067,7 +30114,8 @@ gr_page_unmapped:
 			    (emit_gsimg ? (9u + ((gs_mode & 1u) ? 11u : 0u) +
 					   ((gs_ctx & 1u) ? 2u : 0u) +
 					   ((gs_ctx & 2u) ? 2u : 0u)) : 0u) +
-			    (emit_raster ? 17u : 0u)
+			    (emit_raster ? 17u : 0u) +
+			    (emit_raster_extra ? 16u : 0u)
 			    <= 96u) {
 				/*
 				 * SESSION 155 CONT 9: pair_safe emits each
diff --git a/kernel/gsp_phys_gpu.h b/kernel/gsp_phys_gpu.h
index f74fff1..7de4fd5 100644
--- a/kernel/gsp_phys_gpu.h
+++ b/kernel/gsp_phys_gpu.h
@@ -380,6 +380,12 @@ bool gsp_phys_rmcall_gr_raster_pre_value(void);
  */
 bool gsp_phys_rmcall_gr_stale_write_value(void);
 
+/*
+ * SESSION 155 CONT 22: extra neutral raster state (blend/alpha/cull/point/
+ * ZCULL) for replayed 3D windows.
+ */
+bool gsp_phys_rmcall_gr_raster_extra_value(void);
+
 /*
  * SESSION 155 CONT 15: synthesized GS SPH placement/maps/context A/B.
  */
-- 
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