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VIDEO: sprite background priorities fixed

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Bruno Duarte Gouveia
2019-04-12 20:52:52 +01:00
parent 5bf5828626
commit e56044367b
1 changed files with 24 additions and 13 deletions
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37
video.v
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@@ -362,28 +362,39 @@ wire [14:0] sprite_pix = isGBC?{obpd[sprite_palette_index+1][6:0],obpd[sprite_pa
(sprite_pixel_data == 2'b10)?{13'd0,obp[5:4]}:
{13'd0,obp[7:6]};
// a sprite pixel is visible if
// - sprites are enabled
// - there's a sprite at the current position
// - the sprites prioroty bit is 0, or
// - the sprites priority is 1 and the backrgound color is 00
// - GBC : BG priority is 0
// - GBC : BG priority is 1 and the backrgound color is 00
// https://forums.nesdev.com/viewtopic.php?f=20&t=10771&sid=8fdb6e110fd9b5434d4a567b1199585e#p122222
// priority list: BG0 < OBJL < BGL < OBJH < BGH
wire bg_piority = isGBC&&stage2_bgp_buffer_pix[stage2_rptr][3];
wire [1:0] bg_color = stage2_buffer[stage2_rptr];
reg sprite_pixel_visible;
always @(*) begin
sprite_pixel_visible = 1'b0;
if (sprite_pixel_active && lcdc_spr_ena) begin // pixel active and sprites enabled
if (bg_color == 2'b00) // background color = 0
sprite_pixel_visible = 1'b1;
else if (!bg_piority && !sprite_pixel_prio) // sprite has priority enabled and background priority disabled
sprite_pixel_visible = 1'b1;
if (isGBC) begin
if (sprite_pixel_data == 2'b00)
sprite_pixel_visible = 1'b0;
else if (bg_color == 2'b00)
sprite_pixel_visible = 1'b1;
else if (!lcdc_bg_ena)
sprite_pixel_visible = 1'b1;
else if (bg_piority)
sprite_pixel_visible = 1'b0;
else if (!sprite_pixel_prio) //sprite pixel priority is enabled
sprite_pixel_visible = 1'b1;
end else begin
if (sprite_pixel_data == 2'b00)
sprite_pixel_visible = 1'b0;
else if (bg_color == 2'b00)
sprite_pixel_visible = 1'b1;
else if (!sprite_pixel_prio) //sprite pixel priority is enabled
sprite_pixel_visible = 1'b1;
end
end
end
always @(posedge clk) begin