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[C16] Double height OSD on VGA

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This commit is contained in:
Gyorgy Szombathelyi
2019-02-14 20:22:55 +01:00
parent 214136a723
commit bf99a923be
1 changed files with 9 additions and 10 deletions
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19
cores/c16/osd.v
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@@ -141,8 +141,9 @@ end
reg [9:0] v_cnt;
reg [9:0] vs_low, vs_high;
wire vs_pol = vs_high < vs_low;
wire [9:0] v_dsp_width = vs_pol?vs_low:vs_high;
wire [9:0] v_dsp_ctr = { 1'b0, v_dsp_width[9:1] };
wire [9:0] v_dsp_height = vs_pol?vs_low:vs_high;
wire [9:0] v_dsp_ctr = { 1'b0, v_dsp_height[9:1] };
wire doublescan = (v_dsp_height>350);
always @(posedge clk_sys) begin
reg hsD, vsD;
@@ -172,8 +173,8 @@ end
// area in which OSD is being displayed
wire [9:0] h_osd_start = h_dsp_ctr + OSD_X_OFFSET - (OSD_WIDTH >> 1);
wire [9:0] h_osd_end = h_dsp_ctr + OSD_X_OFFSET + (OSD_WIDTH >> 1) - 1;
wire [9:0] v_osd_start = v_dsp_ctr + OSD_Y_OFFSET - (OSD_HEIGHT >> 1);
wire [9:0] v_osd_end = v_dsp_ctr + OSD_Y_OFFSET + (OSD_HEIGHT >> 1) - 1;
wire [9:0] v_osd_start = v_dsp_ctr + OSD_Y_OFFSET - (doublescan ? OSD_HEIGHT : OSD_HEIGHT >> 1);
wire [9:0] v_osd_end = v_dsp_ctr + OSD_Y_OFFSET + (doublescan ? OSD_HEIGHT : OSD_HEIGHT >> 1) - 1;
reg h_osd_active, v_osd_active;
always @(posedge clk_sys) begin
@@ -189,14 +190,12 @@ end
wire osd_de = osd_enable && h_osd_active && v_osd_active;
wire [7:0] osd_hcnt = h_cnt - h_osd_start + 7'd1; // one pixel offset for osd_byte register
wire [6:0] osd_vcnt = v_cnt - v_osd_start;
wire osd_pixel = osd_byte[osd_vcnt[3:1]];
wire [9:0] osd_hcnt = h_cnt - h_osd_start + 7'd1; // one pixel offset for osd_byte register
wire [9:0] osd_vcnt = v_cnt - v_osd_start;
reg [7:0] osd_byte;
always @(posedge clk_sys)
if (ce_pix) osd_byte <= osd_buffer[{osd_vcnt[6:4], osd_hcnt}];
always @(posedge clk_sys) if(ce_pix) osd_byte <= osd_buffer[{doublescan ? osd_vcnt[7:5] : osd_vcnt[6:4], osd_hcnt[7:0]}];
wire osd_pixel = osd_byte[doublescan ? osd_vcnt[4:2] : osd_vcnt[3:1]];
wire [2:0] osd_color = OSD_COLOR;
assign red_out = !osd_de?red_in: {osd_pixel, osd_pixel, osd_color[2], red_in[5:3] };