first commit

addons/zylann.hterrain/tools/brush/shaders/raise.gdshader

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+shader_type canvas_item;
+render_mode blend_disabled;
+
+#include "res://addons/zylann.hterrain/shaders/include/heightmap.gdshaderinc"
+
+uniform sampler2D u_src_texture;
+uniform vec4 u_src_rect;
+uniform float u_opacity = 1.0;
+uniform float u_factor = 1.0;
+
+vec2 get_src_uv(vec2 screen_uv) {
+	vec2 uv = u_src_rect.xy + screen_uv * u_src_rect.zw;
+	return uv;
+}
+
+void fragment() {
+	float brush_value = u_factor * u_opacity * texture(TEXTURE, UV).r;
+	
+	float src_h = sample_heightmap(u_src_texture, get_src_uv(SCREEN_UV));
+	float h = src_h + brush_value;
+	COLOR = encode_height_to_viewport(h);
+}