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MacPlus_MiSTer/sys/arcade_video.v

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//============================================================================
//
// Copyright (C) 2017-2020 Sorgelig
//
// This program is free software; you can redistribute it and/or modify it
// under the terms of the GNU General Public License as published by the Free
// Software Foundation; either version 2 of the License, or (at your option)
// any later version.
//
// This program is distributed in the hope that it will be useful, but WITHOUT
// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
// more details.
//
// You should have received a copy of the GNU General Public License along
// with this program; if not, write to the Free Software Foundation, Inc.,
// 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
//
//============================================================================
//////////////////////////////////////////////////////////
// DW:
// 6 : 2R 2G 2B
// 8 : 3R 3G 2B
// 9 : 3R 3G 3B
// 12 : 4R 4G 4B
// 24 : 8R 8G 8B
module arcade_video #(parameter WIDTH=320, DW=8, GAMMA=1)
(
input clk_video,
input ce_pix,
input[DW-1:0] RGB_in,
input HBlank,
input VBlank,
input HSync,
input VSync,
output CLK_VIDEO,
output CE_PIXEL,
output [7:0] VGA_R,
output [7:0] VGA_G,
output [7:0] VGA_B,
output VGA_HS,
output VGA_VS,
output VGA_DE,
output [1:0] VGA_SL,
input [2:0] fx,
input forced_scandoubler,
inout [21:0] gamma_bus
);
assign CLK_VIDEO = clk_video;
wire hs_fix,vs_fix;
sync_fix sync_v(CLK_VIDEO, HSync, hs_fix);
sync_fix sync_h(CLK_VIDEO, VSync, vs_fix);
reg [DW-1:0] RGB_fix;
reg CE,HS,VS,HBL,VBL;
always @(posedge CLK_VIDEO) begin
reg old_ce;
old_ce <= ce_pix;
CE <= 0;
if(~old_ce & ce_pix) begin
CE <= 1;
HS <= hs_fix;
if(~HS & hs_fix) VS <= vs_fix;
RGB_fix <= RGB_in;
HBL <= HBlank;
if(HBL & ~HBlank) VBL <= VBlank;
end
end
wire [7:0] R,G,B;
generate
if(DW == 6) begin
assign R = {RGB_fix[5:4],RGB_fix[5:4],RGB_fix[5:4],RGB_fix[5:4]};
assign G = {RGB_fix[3:2],RGB_fix[3:2],RGB_fix[3:2],RGB_fix[3:2]};
assign B = {RGB_fix[1:0],RGB_fix[1:0],RGB_fix[1:0],RGB_fix[1:0]};
end
else if(DW == 8) begin
assign R = {RGB_fix[7:5],RGB_fix[7:5],RGB_fix[7:6]};
assign G = {RGB_fix[4:2],RGB_fix[4:2],RGB_fix[4:3]};
assign B = {RGB_fix[1:0],RGB_fix[1:0],RGB_fix[1:0],RGB_fix[1:0]};
end
else if(DW == 9) begin
assign R = {RGB_fix[8:6],RGB_fix[8:6],RGB_fix[8:7]};
assign G = {RGB_fix[5:3],RGB_fix[5:3],RGB_fix[5:4]};
assign B = {RGB_fix[2:0],RGB_fix[2:0],RGB_fix[2:1]};
end
else if(DW == 12) begin
assign R = {RGB_fix[11:8],RGB_fix[11:8]};
assign G = {RGB_fix[7:4],RGB_fix[7:4]};
assign B = {RGB_fix[3:0],RGB_fix[3:0]};
end
else begin // 24
assign R = RGB_fix[23:16];
assign G = RGB_fix[15:8];
assign B = RGB_fix[7:0];
end
endgenerate
assign VGA_SL = sl[1:0];
wire [2:0] sl = fx ? fx - 1'd1 : 3'd0;
wire scandoubler = fx || forced_scandoubler;
video_mixer #(.LINE_LENGTH(WIDTH+4), .HALF_DEPTH(DW!=24), .GAMMA(GAMMA)) video_mixer
(
.CLK_VIDEO(CLK_VIDEO),
.ce_pix(CE),
.CE_PIXEL(CE_PIXEL),
.scandoubler(scandoubler),
.hq2x(fx==1),
.gamma_bus(gamma_bus),
.R((DW!=24) ? R[7:4] : R),
.G((DW!=24) ? G[7:4] : G),
.B((DW!=24) ? B[7:4] : B),
.HSync (HS),
.VSync (VS),
.HBlank(HBL),
.VBlank(VBL),
.VGA_R(VGA_R),
.VGA_G(VGA_G),
.VGA_B(VGA_B),
.VGA_VS(VGA_VS),
.VGA_HS(VGA_HS),
.VGA_DE(VGA_DE)
);
endmodule
//============================================================================
//
// Screen +90/-90 deg. rotation
// Copyright (C) 2020 Sorgelig
//
// This program is free software; you can redistribute it and/or modify it
// under the terms of the GNU General Public License as published by the Free
// Software Foundation; either version 2 of the License, or (at your option)
// any later version.
//
// This program is distributed in the hope that it will be useful, but WITHOUT
// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
// more details.
//
// You should have received a copy of the GNU General Public License along
// with this program; if not, write to the Free Software Foundation, Inc.,
// 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
//
//============================================================================
module screen_rotate
(
input CLK_VIDEO,
input CE_PIXEL,
input [7:0] VGA_R,
input [7:0] VGA_G,
input [7:0] VGA_B,
input VGA_HS,
input VGA_VS,
input VGA_DE,
input rotate_ccw,
input no_rotate,
input flip,
output video_rotated,
output FB_EN,
output [4:0] FB_FORMAT,
output reg [11:0] FB_WIDTH,
output reg [11:0] FB_HEIGHT,
output [31:0] FB_BASE,
output [13:0] FB_STRIDE,
input FB_VBL,
input FB_LL,
output DDRAM_CLK,
input DDRAM_BUSY,
output [7:0] DDRAM_BURSTCNT,
output [28:0] DDRAM_ADDR,
output [63:0] DDRAM_DIN,
output [7:0] DDRAM_BE,
output DDRAM_WE,
output DDRAM_RD
);
parameter MEM_BASE = 7'b0010010; // buffer at 0x24000000, 3x8MB
reg do_flip;
assign DDRAM_CLK = CLK_VIDEO;
assign DDRAM_BURSTCNT = 1;
assign DDRAM_ADDR = {MEM_BASE, i_fb, ram_addr[22:3]};
assign DDRAM_BE = ram_addr[2] ? 8'hF0 : 8'h0F;
assign DDRAM_DIN = {ram_data,ram_data};
assign DDRAM_WE = ram_wr;
assign DDRAM_RD = 0;
assign FB_EN = fb_en[2];
assign FB_FORMAT = 5'b00110;
assign FB_BASE = {MEM_BASE,o_fb,23'd0};
assign FB_STRIDE = stride;
function [1:0] buf_next;
input [1:0] a,b;
begin
buf_next = 1;
if ((a==0 && b==1) || (a==1 && b==0)) buf_next = 2;
if ((a==1 && b==2) || (a==2 && b==1)) buf_next = 0;
end
endfunction
assign video_rotated = ~no_rotate;
always @(posedge CLK_VIDEO) begin
do_flip <= no_rotate && flip;
if( do_flip ) begin
FB_WIDTH <= hsz;
FB_HEIGHT <= vsz;
end else begin
FB_WIDTH <= vsz;
FB_HEIGHT <= hsz;
end
end
reg [1:0] i_fb,o_fb;
always @(posedge CLK_VIDEO) begin
reg old_vbl,old_vs;
old_vbl <= FB_VBL;
old_vs <= VGA_VS;
if(FB_LL) begin
if(~old_vbl & FB_VBL) o_fb<={1'b0,~i_fb[0]};
if(~old_vs & VGA_VS) i_fb<={1'b0,~i_fb[0]};
end
else begin
if(~old_vbl & FB_VBL) o_fb<=buf_next(o_fb,i_fb);
if(~old_vs & VGA_VS) i_fb<=buf_next(i_fb,o_fb);
end
end
initial begin
fb_en = 0;
end
reg [2:0] fb_en = 0;
reg [11:0] hsz = 320, vsz = 240;
reg [11:0] bwidth;
reg [22:0] bufsize;
always @(posedge CLK_VIDEO) begin
reg [11:0] hcnt = 0, vcnt = 0;
reg old_vs, old_de;
if(CE_PIXEL) begin
old_vs <= VGA_VS;
old_de <= VGA_DE;
hcnt <= hcnt + 1'd1;
if(~old_de & VGA_DE) begin
hcnt <= 1;
vcnt <= vcnt + 1'd1;
end
if(old_de & ~VGA_DE) begin
hsz <= hcnt;
if( do_flip ) bwidth <= hcnt + 2'd3;
end
if(~old_vs & VGA_VS) begin
vsz <= vcnt;
if( !do_flip ) bwidth <= vcnt + 2'd3;
vcnt <= 0;
fb_en <= {fb_en[1:0], ~no_rotate | flip};
end
if(old_vs & ~VGA_VS) bufsize <= (do_flip ? vsz : hsz ) * stride;
end
end
wire [13:0] stride = {bwidth[11:2], 4'd0};
reg [22:0] ram_addr, next_addr;
reg [31:0] ram_data;
reg ram_wr;
always @(posedge CLK_VIDEO) begin
reg [13:0] hcnt = 0;
reg old_vs, old_de;
ram_wr <= 0;
if(CE_PIXEL && FB_EN) begin
old_vs <= VGA_VS;
old_de <= VGA_DE;
if(~old_vs & VGA_VS) begin
next_addr <=
do_flip ? bufsize-3'd4 :
rotate_ccw ? (bufsize - stride) : {vsz-1'd1, 2'b00};
hcnt <= rotate_ccw ? 3'd4 : {vsz-2'd2, 2'b00};
end
if(VGA_DE) begin
ram_wr <= 1;
ram_data <= {8'd0,VGA_B,VGA_G,VGA_R};
ram_addr <= next_addr;
next_addr <=
do_flip ? next_addr-3'd4 :
rotate_ccw ? (next_addr - stride) : (next_addr + stride);
end
if(old_de & ~VGA_DE & ~do_flip) begin
next_addr <= rotate_ccw ? (bufsize - stride + hcnt) : hcnt;
hcnt <= rotate_ccw ? (hcnt + 3'd4) : (hcnt - 3'd4);
end
end
end
endmodule
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