Pixel-Composer/scripts/glsl_draw/glsl_draw.gml

global.glsl_reserved = ds_map_create();
global.glsl_constant = ds_map_create();

var reserved = ["int", "float", "bool", "vec2", "vec3", "vec4", "mat3", "mat4", "sampler2D",
				"gl_position", "gm_Matrices", "gl_FragColor", "gm_BaseTexture", 
				"and", "break", "do", "else", "elseif", "end", "false", 
				"for", "function", "if", "in", "local", "nil", "not", 
				"or", "repeat", "return", "then", "true", "until", "while"];

for( var i = 0, n = array_length(reserved); i < n; i++ )
	global.glsl_reserved[? reserved[i]] = 1;
	
var constant = ["MATRIX_VIEW", "MATRIX_PROJECTION", "MATRIX_WORLD", "MATRIX_WORLD_VIEW", "MATRIX_WORLD_VIEW_PROJECTION" ];

for( var i = 0, n = array_length(constant); i < n; i++ )
	global.glsl_constant[? constant[i]] = 1;

function draw_code_glsl(_x, _y, str) {
	var tx = _x;
	var ty = _y;
	var words = token_splice(str);
	
	for( var j = 0; j < array_length(words); j++ ) {
		var word = words[j];
		var wordNoS = string_trim(word);
		
		draw_set_color(COLORS._main_text);
		
		if(word == "(" || word == ")" || word == "[" || word == "]" || word == "{" || word == "}")
			draw_set_color(COLORS.lua_highlight_bracklet);
		else if(ds_map_exists(global.glsl_reserved, word))
			draw_set_color(COLORS.lua_highlight_keyword);
		else if(wordNoS == string_decimal(wordNoS) || ds_map_exists(global.glsl_constant, word))
			draw_set_color(COLORS.lua_highlight_number);
		else if(j < array_length(words) - 1) {
			if(words[j + 1] == "(") draw_set_color(COLORS.lua_highlight_function);
		}
		
		draw_text_add(tx, ty, word);
		tx += string_width(word);
	}
}