Tweak monochrome calculations

budude2 · Aug 21, 2024 · 6818f50 · 6818f50
1 parent e0dc646
commit 6818f50
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Showing 2 changed files with 2 additions and 2 deletions.
diff --git a/src/core/core_top.sv b/src/core/core_top.sv
@@ -1204,7 +1204,7 @@ assign video_hs           = video_hs_reg;
 assign video_vs           = video_vs_reg;
 
 wire [7:0] lum;
-assign lum = (video_rgb_reg[23:16]>>2) + (video_rgb_reg[23:16]>>5) + (video_rgb_reg[15:8]>>1) + (video_rgb_reg[15:8]>>4) + (video_rgb_reg[7:0]>>4) + (video_rgb_reg[7:0]>>5);
+assign lum = (21 * video_rgb_reg[23:16] + 72 * video_rgb_reg[15:8] + 7 * video_rgb_reg[7:0]) / 100;
 
 always_comb begin
   if(~video_de_reg) begin

diff --git a/src/gb/lcd.v b/src/gb/lcd.v
@@ -283,7 +283,7 @@ wire [31:0] g10 = (g5 * 3) + b5;
 wire [31:0] b10 = (r5 * 3) + (g5 * 2) + (b5 * 11);
 
 // greyscale
-wire [7:0] grey = (pixel==0) ? 8'd252 : (pixel==1) ? 8'd168 : (pixel==2) ? 8'd96 : 8'd0;
+wire [7:0] grey = (pixel==0) ? 8'd255 : (pixel==1) ? 8'd173 : (pixel==2) ? 8'd82 : 8'd0;
 
 // sgb_border_pix contains backdrop color when sgb_border_pix[15] is low.
 wire sgb_border = sgb_border_pix[15] & sgb_en;