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Add Scanline contrast

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Reduce scanline strength for bright pixels
This commit is contained in:
paulb-nl committed 2018-02-24 21:56:18 +01:00
1 parent 9a2c9bb020
commit 990bc1563e
6 files changed
+1051 -1015
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rtl/scanconverter.v
+34 -3
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@@ -42,6 +42,9 @@
`define SCANLINES_V 2'h2
`define SCANLINES_ALT 2'h3
`define SCANLINES_CONTRAST_LOW 2'h1
`define SCANLINES_CONTRAST_HIGH 2'h2
`define VSYNCGEN_LEN 6
`define VSYNCGEN_GENMID_BIT 0
`define VSYNCGEN_CHOPMID_BIT 1
@@ -100,6 +103,8 @@ reg [7:0] R_in_L, G_in_L, B_in_L, R_in_LL, G_in_LL, B_in_LL, R_1x, G_1x, B_1x;
reg [7:0] R_pp3, G_pp3, B_pp3, R_pp4, G_pp4, B_pp4, R_pp5, G_pp5, B_pp5, R_pp6, G_pp6, B_pp6;
reg [7:0] R_prev_pp2, G_prev_pp2, B_prev_pp2, R_prev_pp3, G_prev_pp3, B_prev_pp3, R_prev_pp4, G_prev_pp4, B_prev_pp4;
reg signed [14:0] R_diff_pp3, G_diff_pp3, B_diff_pp3, R_diff_pp4, G_diff_pp4, B_diff_pp4;
reg [7:0] R_sl_contrast_pp4, G_sl_contrast_pp4, B_sl_contrast_pp4, R_scanline_str_pp5, G_scanline_str_pp5, B_scanline_str_pp5;
//H+V syncs + data enable signals&registers
wire HSYNC_act, VSYNC_act, DE_act;
@@ -163,8 +168,10 @@ reg [9:0] H_L5BORDER;
reg [3:0] X_MASK_BR;
reg [7:0] X_SCANLINESTR;
reg [5:0] X_REV_LPF_STR;
reg [1:0] H_SL_CONTRAST;
reg X_REV_LPF_ENABLE;
//clk27 related registers
reg VSYNC_in_cc_L, VSYNC_in_cc_LL, VSYNC_in_cc_LLL;
reg [21:0] clk27_ctr; // min. 6.5Hz
@@ -175,6 +182,20 @@ assign pclk_1x = PCLK_in;
assign PCLK_out = pclk_act;
assign pclk_lock = {pclk_2x_lock, pclk_3x_lock};
//Scanline contrast. Bright pixels decrease scanline strength.
function [7:0] apply_scanline_strength;
input [7:0] str;
input [7:0] data;
input [1:0] contrast;
begin
if (contrast)
apply_scanline_strength = (str > data) ? (str - data) : 8'h00;
else
apply_scanline_strength = str;
end
endfunction
//Scanline generation
function [7:0] apply_scanlines;
input [1:0] mode;
@@ -184,6 +205,7 @@ function [7:0] apply_scanlines;
input [2:0] line_id;
input [2:0] col_id;
input fid;
begin
if ((mode == `SCANLINES_H) && (mask & (5'h1<<line_id)))
apply_scanlines = (data > str) ? (data-str) : 8'h00;
@@ -492,6 +514,10 @@ begin
R_diff_pp4 <= (R_diff_pp3 * X_REV_LPF_STR);
G_diff_pp4 <= (G_diff_pp3 * X_REV_LPF_STR);
B_diff_pp4 <= (B_diff_pp3 * X_REV_LPF_STR);
// Scanline contrast Low (62%) and High (87%) setting.
R_sl_contrast_pp4 <= (H_SL_CONTRAST == `SCANLINES_CONTRAST_HIGH) ? (R_pp3 - (R_pp3 >> 3)) : ((R_pp3 >> 1) + (R_pp3 >> 3));
G_sl_contrast_pp4 <= (H_SL_CONTRAST == `SCANLINES_CONTRAST_HIGH) ? (G_pp3 - (G_pp3 >> 3)) : ((G_pp3 >> 1) + (G_pp3 >> 3));
B_sl_contrast_pp4 <= (H_SL_CONTRAST == `SCANLINES_CONTRAST_HIGH) ? (B_pp3 - (B_pp3 >> 3)) : ((B_pp3 >> 1) + (B_pp3 >> 3));
R_pp5 <= apply_reverse_lpf(X_REV_LPF_ENABLE, R_pp4, R_prev_pp4, R_diff_pp4);
G_pp5 <= apply_reverse_lpf(X_REV_LPF_ENABLE, G_pp4, G_prev_pp4, G_diff_pp4);
@@ -503,10 +529,13 @@ begin
col_id_pp5 <= col_id_pp4;
border_enable_pp5 <= border_enable_pp4;
lt_box_enable_pp5 <= lt_box_enable_pp4;
R_scanline_str_pp5 <= apply_scanline_strength(X_SCANLINESTR, R_sl_contrast_pp4, H_SL_CONTRAST);
G_scanline_str_pp5 <= apply_scanline_strength(X_SCANLINESTR, G_sl_contrast_pp4, H_SL_CONTRAST);
B_scanline_str_pp5 <= apply_scanline_strength(X_SCANLINESTR, B_sl_contrast_pp4, H_SL_CONTRAST);
R_pp6 <= apply_scanlines(V_SCANLINEMODE, R_pp5, X_SCANLINESTR, V_SCANLINEID, line_id_pp5, col_id_pp5, FID_1x);
G_pp6 <= apply_scanlines(V_SCANLINEMODE, G_pp5, X_SCANLINESTR, V_SCANLINEID, line_id_pp5, col_id_pp5, FID_1x);
B_pp6 <= apply_scanlines(V_SCANLINEMODE, B_pp5, X_SCANLINESTR, V_SCANLINEID, line_id_pp5, col_id_pp5, FID_1x);
R_pp6 <= apply_scanlines(V_SCANLINEMODE, R_pp5, R_scanline_str_pp5, V_SCANLINEID, line_id_pp5, col_id_pp5, FID_1x);
G_pp6 <= apply_scanlines(V_SCANLINEMODE, G_pp5, G_scanline_str_pp5, V_SCANLINEID, line_id_pp5, col_id_pp5, FID_1x);
B_pp6 <= apply_scanlines(V_SCANLINEMODE, B_pp5, B_scanline_str_pp5, V_SCANLINEID, line_id_pp5, col_id_pp5, FID_1x);
HSYNC_pp6 <= HSYNC_pp5;
VSYNC_pp6 <= VSYNC_pp5;
DE_pp6 <= DE_pp5;
@@ -688,6 +717,8 @@ begin
H_OPT_SAMPLE_MULT <= h_info2[12:10];
H_OPT_STARTOFF <= h_info2[9:0];
H_SL_CONTRAST <= extra_info[14:13];
X_REV_LPF_ENABLE <= (extra_info[12:8] != 5'b00000);
X_REV_LPF_STR <= (extra_info[12:8] + 6'd16);