shouse: implement screen flip (#691)

jotego · Aug 3, 2024 · 9e3392e · 9e3392e · jotego · Sep 19, 2024
1 parent 207817f
commit 9e3392e
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Showing 2 changed files with 14 additions and 13 deletions.
diff --git a/cores/shouse/hdl/jtshouse_obj.v b/cores/shouse/hdl/jtshouse_obj.v
@@ -97,7 +97,7 @@ always @* begin
         3: ypos = -(oram_dout[15:8] - 8'd28); //  4
     endcase
 
-    ydiff = (vrender[7:0] + yoffset + 8'h10) - ypos;
+    ydiff = ((flip ? ~(vrender[7:0] - 8'h20) : vrender[7:0]) + yoffset + 8'h10) - ypos;
     ydiff[8] = 0;
 
     case(vsize)
@@ -130,7 +130,7 @@ assign rom_addr  = { pre_addr[17-:11],
             dr_hsize[0] ? dr_hmsb[0] : pre_addr[6] /* H8 */ };
 
 always @(posedge clk) begin
-    xoffset  <= pre_xos-(flip ? 9'd3 : 9'd75); //+{debug_bus[7],debug_bus};
+    xoffset  <= pre_xos-(flip ? -9'd7 : 9'd8); //+{debug_bus[7],debug_bus};
     yoffset  <= pre_yos+(flip ? 9'd1 : -9'd1);
 end
 
@@ -166,18 +166,14 @@ always @(posedge clk, posedge rst) begin
                 1: begin // read 13, 12
                     attr[6:0] <= oram_dout[7:1];
                     // xraw      <= {oram_dout[0], oram_dout[15:8]};
-                    xpos      <= ({1'b0,oram_dout[0], oram_dout[15:8]}+xoffset)^{10{flip}};
+                    xpos      <= ({1'b0,oram_dout[0], oram_dout[15:8]}+xoffset);
                     scan_sub   <= 1;
                 end
                 2: begin // read 11, 10
                     code  <= { oram_dout[2:0], oram_dout[15:8] };
                     hsize <= oram_dout[7:6];
                     hos   <= oram_dout[4:3]; // H offset
-                    hflip <= oram_dout[5]^flip;
-                    xpos  <= xpos + (!flip?10'h43:(
-                                    oram_dout[7:6]==0?10'h45:
-                                    oram_dout[7:6]==1?10'h4d:
-                                    oram_dout[7:6]==2?10'h35:10'h51));
+                    hflip <= oram_dout[5];
                 end
                 3: begin
                     if( !dr_bsy ) begin

diff --git a/cores/shouse/hdl/jtshouse_scr.sv b/cores/shouse/hdl/jtshouse_scr.sv
@@ -64,7 +64,6 @@ parameter  [ 8:0] VB_END = 9'h120;
 localparam [ 8:0] HMARGIN=9'h8,
                   HSTART=9'h40-HMARGIN,
                   HEND=9'd288+HSTART+(HMARGIN<<1); // hdump is non blank from 'h40 to 'h160
-localparam [15:0] VSCR =-16'd28;
 
 wire [15:0] hoff0 = flip ? 16'h71 : -16'h0f;
 wire [15:0] hoff1 = flip ? hoff0 + 16'h2 : hoff0 - 16'h2;
@@ -138,7 +137,11 @@ always @(posedge clk, posedge rst) begin
             hcnt2 <= (-hscr[2][2:0] ^ {3{~flip}})+hoff2[2:0];
             hcnt3 <= (-hscr[3][2:0] ^ {3{~flip}})+hoff3[2:0];
 
-            if(vdump[2:0]==0) lin_row <= vdump[8:3]==6'h24 ? 10'd1 : lin_row+10'd36;
+            if(vdump[2:0]==0)
+                if (flip)
+                    lin_row <= vdump[8:3]==6'h24 ? 10'd973 : lin_row-10'd36;
+                else
+                    lin_row <= vdump[8:3]==6'h24 ? 10'd1 : lin_row+10'd36;
             // if(vrender[2:0]==7) lin_row <= vrender[8:3]==6'h24 ? 10'd1 : lin_row+10'd36;
             // if(vrender==9'h120 ) lin_row <= 1;
         end
@@ -157,9 +160,11 @@ always @* begin
     if( mlyr>3 )
         { vpos, hpos } = { 7'd0, vdump, 7'd0, hcnt };
     else
-        { vpos, hpos } = { {7'd0, vdump}-(vscr[mlyr[1:0]] ^ {16{~flip}}) + (flip ? VSCR : -VSCR + 16'd219),
+        { vpos, hpos } = { {7'd0, vdump}+vscr[mlyr[1:0]] + 16'd248,
                            {7'd0,  hcnt}-(hscr[mlyr[1:0]] ^ {16{~flip}}) + hoff};
 
+    if ( flip ) vpos = ~vpos;
+
     // Determines the active layer
     win    = 5;
     cprio  = 0;
@@ -246,7 +251,7 @@ jtframe_linebuf #(.DW(14)) u_buffer(
     .wr_addr    ( buf_a     ),
     .wr_data    ({bpxl,bprio}),
     .we         ( buf_we    ),
-    .rd_addr    ( hdump     ),
+    .rd_addr    ( flip ? ~hdump - 9'h5e : hdump ),
     .rd_data    ({pxl,prio} ),
     .rd_gated   (           )
 );
@@ -287,4 +292,4 @@ always @(posedge miss) begin
 end
 `endif
 
-endmodule
+endmodule