From 8d441aad2f3bc191388e1bbe64c3f40679c9514b Mon Sep 17 00:00:00 2001
From: Tanasart <tanasart_pt@outlook.co.th>
Date: Sun, 2 Mar 2025 11:26:14 +0700
Subject: [PATCH] [Checker] Add diagonal mode.

---
 scripts/node_checker/node_checker.gml       | 17 +++++++++------
 shaders/sh_checkerboard/sh_checkerboard.fsh | 24 +++++++++++++++++++--
 2 files changed, 33 insertions(+), 8 deletions(-)

diff --git a/scripts/node_checker/node_checker.gml b/scripts/node_checker/node_checker.gml
index 03bac3607..d5e17ffce 100644
--- a/scripts/node_checker/node_checker.gml
+++ b/scripts/node_checker/node_checker.gml
@@ -34,11 +34,13 @@ function Node_Checker(_x, _y, _group = noone) : Node_Processor(_x, _y, _group) c
 	
 	newInput(8, nodeValue_Enum_Button("Type", self,  0, [ "Solid", "Smooth", "AA" ]));
 	
+	newInput(9, nodeValue_Bool("Diagonal", self, false));
+	
 	newOutput(0, nodeValue_Output("Surface Out", self, VALUE_TYPE.surface, noone));
 	
 	input_display_list = [
 		["Output",	true],	0,  
-		["Pattern",	false], 1, 6, 2, 7, 3,
+		["Pattern",	false], 9, 1, 6, 2, 7, 3,
 		["Render",	false], 8, 4, 5,
 	];
 	
@@ -63,20 +65,23 @@ function Node_Checker(_x, _y, _group = noone) : Node_Processor(_x, _y, _group) c
 	
 	static processData = function(_outSurf, _data, _output_index, _array_index) {
 		var _dim = _data[0];
-		var _pos = _data[3];
+		var _pos = _data[3]
+		
+		inputs[2].setVisible(!_data[9]);
 		
 		_outSurf = surface_verify(_outSurf, _dim[0], _dim[1], attrDepth());
-			
+		
 		surface_set_shader(_outSurf, sh_checkerboard);
-			shader_set_f("dimension",   surface_get_width_safe(_outSurf), surface_get_height_safe(_outSurf));
+			shader_set_2("dimension",  _dim);
+			shader_set_i("diagonal",   _data[9]);
 			shader_set_f("position",   _pos[0] / _dim[0], _pos[1] / _dim[1]);
 			shader_set_f_map("amount", _data[1], _data[6], inputs[1]);
 			shader_set_f_map("angle",  _data[2], _data[7], inputs[2]);
 			shader_set_color("col1",   _data[4]);
 			shader_set_color("col2",   _data[5]);
-			shader_set_i("blend",	   _data[8]);
+			shader_set_i("blend",      _data[8]);
 			
-			draw_sprite_ext(s_fx_pixel, 0, 0, 0, _dim[0], _dim[1], 0, c_white, 1);
+			draw_empty();
 		surface_reset_shader();
 		
 		return _outSurf;
diff --git a/shaders/sh_checkerboard/sh_checkerboard.fsh b/shaders/sh_checkerboard/sh_checkerboard.fsh
index a896b8e59..f965ea752 100644
--- a/shaders/sh_checkerboard/sh_checkerboard.fsh
+++ b/shaders/sh_checkerboard/sh_checkerboard.fsh
@@ -5,6 +5,7 @@ varying vec4 v_vColour;
 
 uniform vec2 dimension;
 uniform vec2 position;
+uniform int  diagonal;
 uniform int  blend;
 
 uniform vec2      amount;
@@ -28,7 +29,6 @@ float check(vec2 c, float amo, float ang) {
 	float mm = mod(floor(_x / _a) + floor(_y / _a), 2.);
 	
 	return mm < .5? 0.5 + dd : 0.5 - dd;
-	//return mod(floor(_x / _a) + floor(_y / _a), 2.);
 }
 
 void main() {
@@ -49,8 +49,28 @@ void main() {
 	
 	vec2 a = dimension / dimension.y;
 	vec2 c = (v_vTexcoord - position) * a;
+	float ch;
+	
+	if(diagonal == 0 || blend != 0) {
+		if(diagonal == 1) {
+			ang += PI / 4.;
+			amo *= sqrt(2.);
+		}
+		
+		ch = check(c, amo, ang);
+		
+	} else {
+		vec2 pa = floor(dimension / amo);
+		vec2 px = floor(dimension * c);
+		     px = mod(px, pa);
+		
+		bool d1 = px.x > px.y;
+		bool d2 = (pa.x - px.x) > px.y;
+		bool chk = (d1 && d2) || (!d1 && !d2);
+		
+		ch = chk? 1. : 0.;
+	}
 	
-	float ch = check(c, amo, ang);
 	
 	if(blend == 0) gl_FragColor = ch < 0.5? col1 : col2;
 	else if(blend == 1) {