rtl/gfx: implement double-buffered scanout

1 files changed, 23 insertions, 0 deletions

diff --git a/rtl/gfx/gfx_defs.sv b/rtl/gfx/gfx_defs.sv
index b1f8bb8..01b7116 100644
--- a/rtl/gfx/gfx_defs.sv
+++ b/rtl/gfx/gfx_defs.sv
@@ -20,4 +20,27 @@ typedef logic[1:0] index4;
 `define INDEX4_MIN 2'b00
 `define INDEX4_MAX 2'b11
 
+typedef logic[9:0]  y_coord;
+typedef logic[8:0]  x_coord;
+typedef logic[18:0] linear_coord;
+typedef logic[19:0] half_coord;
+
+`define GFX_X_RES      640
+`define GFX_Y_RES      480
+`define GFX_LINEAR_RES (`GFX_X_RES * `GFX_Y_RES)
+
+typedef struct packed
+{
+	logic[7:0] r, g, b;
+} rgb24;
+
+typedef struct packed
+{
+	logic[9:0] r, g, b;
+} rgb30;
+
+`define GFX_MASK_SRAM_STAGES 3
+`define GFX_MASK_STAGES      (1 + `GFX_MASK_SRAM_STAGES + 1)
+`define GFX_SCAN_STAGES      3 // Ajustable
+
 `endif