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// ZX-Evo Base Configuration (c) NedoPC 2008,2009,2010,2011,2012,2013,2014
//
// mix up border and pixels, add palette and blanks
/*
This file is part of ZX-Evo Base Configuration firmware.
ZX-Evo Base Configuration firmware 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 3 of the License, or
(at your option) any later version.
ZX-Evo Base Configuration firmware 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 ZX-Evo Base Configuration firmware.
If not, see <http://www.gnu.org/licenses/>.
*/
`include "../include/tune.v"
module video_palframe(
input wire clk, // 28MHz clock
input wire hpix,
input wire vpix,
input wire hblank,
input wire vblank,
input wire hsync_start,
input wire vsync,
input wire [ 3:0] pixels,
input wire [ 3:0] border,
input wire border_sync,
input wire border_sync_ena,
// ulaplus related
input wire [ 1:0] up_palsel,
input wire [ 2:0] up_paper,
input wire [ 2:0] up_ink,
input wire up_pixel,
input wire up_ena,
input wire up_palwr,
input wire [ 5:0] up_paladdr,
input wire [ 7:0] up_paldata,
input wire atm_palwr,
input wire [ 5:0] atm_paldata,
input wire [ 5:0] atm_paldatalow,
input wire pal444_ena,
input wire [ 1:0] modes_raster, // 2'b00 - pentagon raster (71680 clocks)
// 2'b01 - 60Hz raster
// 2'b10 - 48k raster (69888 clocks)
// 2'b11 - 128k raster (70908 clocks)
output wire [ 5:0] palcolor, // just for palette readback
output wire [ 5:0] color
);
reg [11/*7*/:0] palette_read;
wire [ 3:0] zxcolor;
wire [ 5:0] up_color;
wire [ /*8*/7:0] palette_color;
reg [3:0] synced_border;
reg vsync_r;
reg [2:0/*1:0*/] ctr_14;
reg ctr_h;
//reg ctr_v;
reg [1:0] phase; //frame number
always @(posedge clk)
if( border_sync )
synced_border <= border;
assign zxcolor = (hpix&vpix) ? pixels : (border_sync_ena ? synced_border : border);
assign up_color = (hpix&vpix) ? {up_palsel,~up_pixel,up_pixel?up_ink:up_paper} : {3'd0,border[2:0]};
assign palette_color = (up_ena&(modes_raster == 2'b11/*128K raster*/)) ? {/*3'b100*/2'b10,up_color} : {/*5'd0*/4'd0,zxcolor};
// palette
reg [/*7*/11:0] palette [0:/*511*/255]; // let quartus instantiate it as RAM
always @(posedge clk)
begin
if( atm_palwr || up_palwr )
begin : palette_write
reg [8:0] pal_addr;
pal_addr = atm_palwr ? { 4'd0, zxcolor } : { 2'b10, up_paladdr };
palette[pal_addr] <= atm_palwr ?
{atm_paldata[3:2],pal444_ena?atm_paldatalow[3:2]:atm_paldata[3:2],
atm_paldata[5:4],pal444_ena?atm_paldatalow[5:4]:atm_paldata[5:4],
atm_paldata[1:0],pal444_ena?atm_paldatalow[1:0]:atm_paldata[1:0]
}
: {up_paldata[7:5],up_paldata[5],up_paldata[4:2],up_paldata[2],up_paldata[1:0],up_paldata[0],up_paldata[0]};
end
palette_read <= palette[palette_color];
end
assign palcolor = pal444_ena?
{palette_read[5:4],palette_read[9:8], palette_read[1:0]}
:{palette_read[7:6/*4:3*/],palette_read[11:10/*7:6*/], palette_read[3:2/*1:0*/]};
// make 3bit palette
always @(posedge clk)
vsync_r <= vsync;
//
wire vsync_start = vsync && !vsync_r;
//
initial ctr_14 = 3'b000;
always @(posedge clk)
ctr_14 <= ctr_14+3'b001;
//
initial ctr_h = 1'b0;
always @(posedge clk) if( hsync_start )
ctr_h <= ~ctr_h;
//
//initial ctr_v = 1'b0;
//always @(posedge clk) if( vsync_start )
// ctr_v <= ~ctr_v;
//
initial phase = 2'b00;
always @(posedge clk) if( vsync_start )
if (modes_raster == 2'b10/*48K raster*/) phase <= phase+2'b01;
//wire plus1 = ctr_14[1] ^ ctr_h ^ ctr_v;
wire [1:0] red;
wire [1:0] grn;
wire [1:0] blu;
wire bigpal_ena = up_ena | pal444_ena;
video_palframe_mk3bit red_color
(
//.plus1 (plus1 ),
.phase (phase),
.x (ctr_14[2:1] ),
.y (ctr_h ),
.color_in (palette_read[11:8/*7:5*/]),
.color_out(red )
);
//
video_palframe_mk3bit grn_color
(
//.plus1 (plus1 ),
.phase (phase),
.x (ctr_14[2:1] ),
.y (ctr_h ),
.color_in (palette_read[7:4/*4:2*/]),
.color_out(grn )
);
//
video_palframe_mk3bit blu_color
(
//.plus1 (plus1 ),
.phase (phase),
.x (ctr_14[2:1] ),
.y (ctr_h ),
.color_in (palette_read[3:0/*4:2*/]),
.color_out(blu )
);
//
//assign blu = palette_read[1:0];
assign color = (hblank | vblank) ? 6'd0 : {grn,red,blu};
endmodule
module video_palframe_mk3bit
(
//input wire plus1,
input wire [1:0] phase,
input wire [1:0] x,
input wire y,
input wire [3:0/*2:0*/] color_in,
output reg [1:0] color_out
);
reg [3:0] colorlevel;
reg [1:0] gridlevel;
reg gridy;
reg [1:0] gridindex;
always @*
begin
//colorlevel_table[3:0] = {0,1,2,2,3, 4,5,6,6,7, 8,9,10,10,11, 12};
case( color_in )
/* 3'b000: color_out <= 2'b00;
3'b001: color_out <= plus1 ? 2'b01 : 2'b00;
3'b010: color_out <= 2'b01;
3'b011: color_out <= plus1 ? 2'b10 : 2'b01;
3'b100: color_out <= 2'b10;
3'b101: color_out <= plus1 ? 2'b11 : 2'b10;
default: color_out <= 2'b11;
*/
4'b0000: colorlevel = 4'b0000;
4'b0001: colorlevel = 4'b0001;
4'b0010,
4'b0011: colorlevel = 4'b0010;
4'b0100: colorlevel = 4'b0011;
4'b0101: colorlevel = 4'b0100;
4'b0110: colorlevel = 4'b0101;
4'b0111,
4'b1000: colorlevel = 4'b0110;
4'b1001: colorlevel = 4'b0111;
4'b1010: colorlevel = 4'b1000;
4'b1011: colorlevel = 4'b1001;
4'b1100,
4'b1101: colorlevel = 4'b1010;
4'b1110: colorlevel = 4'b1011;
default: colorlevel = 4'b1100;
endcase
//ïîñêîëüêó ìû íà âõîäå ñêàíäàáëåðà, òî ïîäóðîâíè 1/4 è 3/4 ìåæäó ãëàâíûìè óðîâíÿìè áóäóò ñêàêàòü æèðíûìè ëèíèÿìè
//ôèêñèì ýòî ñäâèãîì ôàçû y ïî êñîðó ñ x[1] èìåííî äëÿ ýòèõ ïîäóðîâíåé (äëÿ 1/2 òàêîé ôèêñ ñëîìàåò ñåòêó)
//colorlevel_grid = {{0,2},{3,1}};
gridy = y ^ (x[1] & colorlevel[0]);
gridindex = {gridy+phase[1], x[0]+phase[0]};
case(gridindex[1:0])
2'b00: gridlevel = 2'b00;
2'b01: gridlevel = 2'b10;
2'b10: gridlevel = 2'b11;
2'b11: gridlevel = 2'b01;
endcase
color_out = colorlevel[3:2] + ((colorlevel[1:0] > gridlevel[1:0]) ? 2'b01 : 2'b00);
end
endmodule