first commit

addons/zylann.hterrain/tools/bump2normal_tex.gdshader

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+shader_type canvas_item;
+
+#include "res://addons/zylann.hterrain/shaders/include/heightmap.gdshaderinc"
+
+vec4 pack_normal(vec3 n) {
+	return vec4((0.5 * (n + 1.0)).xzy, 1.0);
+}
+
+float get_height(sampler2D tex, vec2 uv) {
+	return sample_heightmap(tex, uv);
+}
+
+void fragment() {
+	vec2 uv = UV;
+	vec2 ps = TEXTURE_PIXEL_SIZE;
+	float left = get_height(TEXTURE, uv + vec2(-ps.x, 0));
+	float right = get_height(TEXTURE, uv + vec2(ps.x, 0));
+	float back = get_height(TEXTURE, uv + vec2(0, -ps.y));
+	float fore = get_height(TEXTURE, uv + vec2(0, ps.y));
+	vec3 n = normalize(vec3(left - right, 2.0, fore - back));
+	COLOR = pack_normal(n);
+	// DEBUG
+	//COLOR.r = fract(TIME * 100.0);
+}
+