diff --git a/resources/shaders/ES/background.fs b/resources/shaders/ES/background.fs
new file mode 100644
index 000000000..5f46e658f
--- /dev/null
+++ b/resources/shaders/ES/background.fs
@@ -0,0 +1,13 @@
+#version 100
+
+precision highp float;
+
+uniform vec4 top_color;
+uniform vec4 bottom_color;
+
+varying vec2 tex_coord;
+
+void main()
+{
+    gl_FragColor = mix(bottom_color, top_color, tex_coord.y);
+}
diff --git a/resources/shaders/ES/background.vs b/resources/shaders/ES/background.vs
new file mode 100644
index 000000000..6334c83b1
--- /dev/null
+++ b/resources/shaders/ES/background.vs
@@ -0,0 +1,12 @@
+#version 100
+
+attribute vec3 v_position;
+attribute vec2 v_tex_coord;
+
+varying vec2 tex_coord;
+
+void main()
+{
+	tex_coord = v_tex_coord;
+    gl_Position = vec4(v_position, 1.0);
+}
diff --git a/resources/shaders/ES/dashed_lines.fs b/resources/shaders/ES/dashed_lines.fs
new file mode 100644
index 000000000..9aecd0240
--- /dev/null
+++ b/resources/shaders/ES/dashed_lines.fs
@@ -0,0 +1,20 @@
+#version 100
+
+precision highp float;
+
+// see as reference: https://stackoverflow.com/questions/52928678/dashed-line-in-opengl3
+
+uniform float dash_size;
+uniform float gap_size;
+uniform vec4 uniform_color;
+
+varying float coord_s;
+
+void main()
+{
+	float inv_stride = 1.0 / (dash_size + gap_size);
+    if (gap_size > 0.0 && fract(coord_s * inv_stride) > dash_size * inv_stride)
+        discard;
+		
+	gl_FragColor = uniform_color;
+}
diff --git a/resources/shaders/ES/dashed_lines.vs b/resources/shaders/ES/dashed_lines.vs
new file mode 100644
index 000000000..540715a11
--- /dev/null
+++ b/resources/shaders/ES/dashed_lines.vs
@@ -0,0 +1,17 @@
+#version 100
+
+// see as reference: https://stackoverflow.com/questions/52928678/dashed-line-in-opengl3
+
+uniform mat4 view_model_matrix;
+uniform mat4 projection_matrix;
+
+// v_position.w = coordinate along the line
+attribute vec4 v_position;
+
+varying float coord_s;
+
+void main()
+{
+	coord_s = v_position.w;
+    gl_Position = projection_matrix * view_model_matrix * vec4(v_position.xyz, 1.0);
+}
\ No newline at end of file
diff --git a/resources/shaders/ES/flat.fs b/resources/shaders/ES/flat.fs
new file mode 100644
index 000000000..f27e5d38c
--- /dev/null
+++ b/resources/shaders/ES/flat.fs
@@ -0,0 +1,10 @@
+#version 100
+
+precision highp float;
+
+uniform vec4 uniform_color;
+
+void main()
+{
+    gl_FragColor = uniform_color;
+}
diff --git a/resources/shaders/ES/flat.vs b/resources/shaders/ES/flat.vs
new file mode 100644
index 000000000..a83587239
--- /dev/null
+++ b/resources/shaders/ES/flat.vs
@@ -0,0 +1,11 @@
+#version 100
+
+uniform mat4 view_model_matrix;
+uniform mat4 projection_matrix;
+
+attribute vec3 v_position;
+
+void main()
+{
+    gl_Position = projection_matrix * view_model_matrix * vec4(v_position, 1.0);
+}
diff --git a/resources/shaders/ES/flat_clip.fs b/resources/shaders/ES/flat_clip.fs
new file mode 100644
index 000000000..8de7d1921
--- /dev/null
+++ b/resources/shaders/ES/flat_clip.fs
@@ -0,0 +1,17 @@
+#version 100
+
+precision highp float;
+
+const vec3 ZERO = vec3(0.0, 0.0, 0.0);
+
+uniform vec4 uniform_color;
+
+varying vec3 clipping_planes_dots;
+
+void main()
+{
+    if (any(lessThan(clipping_planes_dots, ZERO)))
+        discard;
+
+    gl_FragColor = uniform_color;
+}
diff --git a/resources/shaders/ES/flat_clip.vs b/resources/shaders/ES/flat_clip.vs
new file mode 100644
index 000000000..baf5a3385
--- /dev/null
+++ b/resources/shaders/ES/flat_clip.vs
@@ -0,0 +1,23 @@
+#version 100
+
+uniform mat4 view_model_matrix;
+uniform mat4 projection_matrix;
+uniform mat4 volume_world_matrix;
+
+// Clipping plane, x = min z, y = max z. Used by the FFF and SLA previews to clip with a top / bottom plane.
+uniform vec2 z_range;
+// Clipping plane - general orientation. Used by the SLA gizmo.
+uniform vec4 clipping_plane;
+
+attribute vec3 v_position;
+
+varying vec3 clipping_planes_dots;
+
+void main()
+{
+    // Fill in the scalars for fragment shader clipping. Fragments with any of these components lower than zero are discarded.
+    vec4 world_pos = volume_world_matrix * vec4(v_position, 1.0);
+    clipping_planes_dots = vec3(dot(world_pos, clipping_plane), world_pos.z - z_range.x, z_range.y - world_pos.z);
+
+    gl_Position = projection_matrix * view_model_matrix * vec4(v_position, 1.0);
+}
diff --git a/resources/shaders/ES/flat_texture.fs b/resources/shaders/ES/flat_texture.fs
new file mode 100644
index 000000000..ec41960f7
--- /dev/null
+++ b/resources/shaders/ES/flat_texture.fs
@@ -0,0 +1,12 @@
+#version 100
+
+precision highp float;
+
+uniform sampler2D uniform_texture;
+
+varying vec2 tex_coord;
+
+void main()
+{
+    gl_FragColor = texture2D(uniform_texture, tex_coord);
+}
diff --git a/resources/shaders/ES/flat_texture.vs b/resources/shaders/ES/flat_texture.vs
new file mode 100644
index 000000000..e83cacd59
--- /dev/null
+++ b/resources/shaders/ES/flat_texture.vs
@@ -0,0 +1,15 @@
+#version 100
+
+uniform mat4 view_model_matrix;
+uniform mat4 projection_matrix;
+
+attribute vec3 v_position;
+attribute vec2 v_tex_coord;
+
+varying vec2 tex_coord;
+
+void main()
+{
+	tex_coord = v_tex_coord;
+    gl_Position = projection_matrix * view_model_matrix * vec4(v_position, 1.0);
+}
diff --git a/resources/shaders/ES/gouraud.fs b/resources/shaders/ES/gouraud.fs
new file mode 100644
index 000000000..368a50279
--- /dev/null
+++ b/resources/shaders/ES/gouraud.fs
@@ -0,0 +1,81 @@
+#version 100
+
+precision highp float;
+
+const vec3 ZERO = vec3(0.0, 0.0, 0.0);
+const float EPSILON = 0.0001;
+
+struct PrintVolumeDetection
+{
+	// 0 = rectangle, 1 = circle, 2 = custom, 3 = invalid
+	int type;
+    // type = 0 (rectangle):
+    // x = min.x, y = min.y, z = max.x, w = max.y
+    // type = 1 (circle):
+    // x = center.x, y = center.y, z = radius
+	vec4 xy_data;
+    // x = min z, y = max z
+	vec2 z_data;
+};
+
+struct SlopeDetection
+{
+    bool actived;
+	float normal_z;
+    mat3 volume_world_normal_matrix;
+};
+
+uniform vec4 uniform_color;
+uniform SlopeDetection slope;
+
+#ifdef ENABLE_ENVIRONMENT_MAP
+    uniform sampler2D environment_tex;
+    uniform bool use_environment_tex;
+#endif // ENABLE_ENVIRONMENT_MAP
+
+uniform PrintVolumeDetection print_volume;
+
+varying vec3 clipping_planes_dots;
+
+// x = diffuse, y = specular;
+varying vec2 intensity;
+
+varying vec4 world_pos;
+varying float world_normal_z;
+varying vec3 eye_normal;
+
+void main()
+{
+    if (any(lessThan(clipping_planes_dots, ZERO)))
+        discard;
+    vec3  color = uniform_color.rgb;
+    float alpha = uniform_color.a;
+
+    if (slope.actived && world_normal_z < slope.normal_z - EPSILON) {
+        color = vec3(0.7, 0.7, 1.0);
+        alpha = 1.0;
+    }
+	
+    // if the fragment is outside the print volume -> use darker color
+	vec3 pv_check_min = ZERO;
+	vec3 pv_check_max = ZERO;
+    if (print_volume.type == 0) {
+		// rectangle
+		pv_check_min = world_pos.xyz - vec3(print_volume.xy_data.x, print_volume.xy_data.y, print_volume.z_data.x);
+		pv_check_max = world_pos.xyz - vec3(print_volume.xy_data.z, print_volume.xy_data.w, print_volume.z_data.y);
+	}
+	else if (print_volume.type == 1) {
+		// circle
+		float delta_radius = print_volume.xy_data.z - distance(world_pos.xy, print_volume.xy_data.xy);
+		pv_check_min = vec3(delta_radius, 0.0, world_pos.z - print_volume.z_data.x);
+		pv_check_max = vec3(0.0, 0.0, world_pos.z - print_volume.z_data.y);
+	}	
+	color = (any(lessThan(pv_check_min, ZERO)) || any(greaterThan(pv_check_max, ZERO))) ? mix(color, ZERO, 0.3333) : color;
+	
+#ifdef ENABLE_ENVIRONMENT_MAP
+    if (use_environment_tex)
+        gl_FragColor = vec4(0.45 * texture2D(environment_tex, normalize(eye_normal).xy * 0.5 + 0.5).xyz + 0.8 * color * intensity.x, alpha);
+    else
+#endif
+        gl_FragColor = vec4(vec3(intensity.y) + color * intensity.x, alpha);
+}
diff --git a/resources/shaders/ES/gouraud.vs b/resources/shaders/ES/gouraud.vs
new file mode 100644
index 000000000..431e48556
--- /dev/null
+++ b/resources/shaders/ES/gouraud.vs
@@ -0,0 +1,77 @@
+#version 100
+
+#define INTENSITY_CORRECTION 0.6
+
+// normalized values for (-0.6/1.31, 0.6/1.31, 1./1.31)
+const vec3 LIGHT_TOP_DIR = vec3(-0.4574957, 0.4574957, 0.7624929);
+#define LIGHT_TOP_DIFFUSE    (0.8 * INTENSITY_CORRECTION)
+#define LIGHT_TOP_SPECULAR   (0.125 * INTENSITY_CORRECTION)
+#define LIGHT_TOP_SHININESS  20.0
+
+// normalized values for (1./1.43, 0.2/1.43, 1./1.43)
+const vec3 LIGHT_FRONT_DIR = vec3(0.6985074, 0.1397015, 0.6985074);
+#define LIGHT_FRONT_DIFFUSE  (0.3 * INTENSITY_CORRECTION)
+//#define LIGHT_FRONT_SPECULAR (0.0 * INTENSITY_CORRECTION)
+//#define LIGHT_FRONT_SHININESS 5.0
+
+#define INTENSITY_AMBIENT    0.3
+
+const vec3 ZERO = vec3(0.0, 0.0, 0.0);
+
+struct SlopeDetection
+{
+    bool actived;
+	float normal_z;
+    mat3 volume_world_normal_matrix;
+};
+
+uniform mat4 view_model_matrix;
+uniform mat4 projection_matrix;
+uniform mat3 view_normal_matrix;
+uniform mat4 volume_world_matrix;
+uniform SlopeDetection slope;
+
+// Clipping plane, x = min z, y = max z. Used by the FFF and SLA previews to clip with a top / bottom plane.
+uniform vec2 z_range;
+// Clipping plane - general orientation. Used by the SLA gizmo.
+uniform vec4 clipping_plane;
+
+attribute vec3 v_position;
+attribute vec3 v_normal;
+
+// x = diffuse, y = specular;
+varying vec2 intensity;
+
+varying vec3 clipping_planes_dots;
+
+varying vec4 world_pos;
+varying float world_normal_z;
+varying vec3 eye_normal;
+
+void main()
+{
+	// First transform the normal into camera space and normalize the result.
+    eye_normal = normalize(view_normal_matrix * v_normal);
+
+	// Compute the cos of the angle between the normal and lights direction. The light is directional so the direction is constant for every vertex.
+	// Since these two are normalized the cosine is the dot product. We also need to clamp the result to the [0,1] range.
+	float NdotL = max(dot(eye_normal, LIGHT_TOP_DIR), 0.0);
+
+	intensity.x = INTENSITY_AMBIENT + NdotL * LIGHT_TOP_DIFFUSE;
+    vec4 position = view_model_matrix * vec4(v_position, 1.0);
+    intensity.y = LIGHT_TOP_SPECULAR * pow(max(dot(-normalize(position.xyz), reflect(-LIGHT_TOP_DIR, eye_normal)), 0.0), LIGHT_TOP_SHININESS);
+
+	// Perform the same lighting calculation for the 2nd light source (no specular applied).
+	NdotL = max(dot(eye_normal, LIGHT_FRONT_DIR), 0.0);
+	intensity.x += NdotL * LIGHT_FRONT_DIFFUSE;
+
+    // Point in homogenous coordinates.
+    world_pos = volume_world_matrix * vec4(v_position, 1.0);
+
+    // z component of normal vector in world coordinate used for slope shading
+    world_normal_z = slope.actived ? (normalize(slope.volume_world_normal_matrix * v_normal)).z : 0.0;
+
+    gl_Position = projection_matrix * position;
+    // Fill in the scalars for fragment shader clipping. Fragments with any of these components lower than zero are discarded.
+    clipping_planes_dots = vec3(dot(world_pos, clipping_plane), world_pos.z - z_range.x, z_range.y - world_pos.z);
+}
diff --git a/resources/shaders/ES/gouraud_light.fs b/resources/shaders/ES/gouraud_light.fs
new file mode 100644
index 000000000..a8de5879c
--- /dev/null
+++ b/resources/shaders/ES/gouraud_light.fs
@@ -0,0 +1,14 @@
+#version 100
+
+precision highp float;
+
+uniform vec4 uniform_color;
+uniform float emission_factor;
+
+// x = tainted, y = specular;
+varying vec2 intensity;
+
+void main()
+{
+    gl_FragColor = vec4(vec3(intensity.y) + uniform_color.rgb * (intensity.x + emission_factor), uniform_color.a);
+}
diff --git a/resources/shaders/ES/gouraud_light.vs b/resources/shaders/ES/gouraud_light.vs
new file mode 100644
index 000000000..98bde435d
--- /dev/null
+++ b/resources/shaders/ES/gouraud_light.vs
@@ -0,0 +1,45 @@
+#version 100
+
+#define INTENSITY_CORRECTION 0.6
+
+// normalized values for (-0.6/1.31, 0.6/1.31, 1./1.31)
+const vec3 LIGHT_TOP_DIR = vec3(-0.4574957, 0.4574957, 0.7624929);
+#define LIGHT_TOP_DIFFUSE    (0.8 * INTENSITY_CORRECTION)
+#define LIGHT_TOP_SPECULAR   (0.125 * INTENSITY_CORRECTION)
+#define LIGHT_TOP_SHININESS  20.0
+
+// normalized values for (1./1.43, 0.2/1.43, 1./1.43)
+const vec3 LIGHT_FRONT_DIR = vec3(0.6985074, 0.1397015, 0.6985074);
+#define LIGHT_FRONT_DIFFUSE  (0.3 * INTENSITY_CORRECTION)
+
+#define INTENSITY_AMBIENT    0.3
+
+uniform mat4 view_model_matrix;
+uniform mat4 projection_matrix;
+uniform mat3 view_normal_matrix;
+
+attribute vec3 v_position;
+attribute vec3 v_normal;
+
+// x = tainted, y = specular;
+varying vec2 intensity;
+
+void main()
+{
+    // First transform the normal into camera space and normalize the result.
+    vec3 normal = normalize(view_normal_matrix * v_normal);
+    
+    // Compute the cos of the angle between the normal and lights direction. The light is directional so the direction is constant for every vertex.
+    // Since these two are normalized the cosine is the dot product. We also need to clamp the result to the [0,1] range.
+    float NdotL = max(dot(normal, LIGHT_TOP_DIR), 0.0);
+
+    intensity.x = INTENSITY_AMBIENT + NdotL * LIGHT_TOP_DIFFUSE;
+    vec4 position = view_model_matrix * vec4(v_position, 1.0);
+    intensity.y = LIGHT_TOP_SPECULAR * pow(max(dot(-normalize(position.xyz), reflect(-LIGHT_TOP_DIR, normal)), 0.0), LIGHT_TOP_SHININESS);
+
+    // Perform the same lighting calculation for the 2nd light source (no specular applied).
+    NdotL = max(dot(normal, LIGHT_FRONT_DIR), 0.0);
+    intensity.x += NdotL * LIGHT_FRONT_DIFFUSE;
+
+    gl_Position = projection_matrix * position;
+}
diff --git a/resources/shaders/ES/gouraud_light_instanced.fs b/resources/shaders/ES/gouraud_light_instanced.fs
new file mode 100644
index 000000000..d737137ee
--- /dev/null
+++ b/resources/shaders/ES/gouraud_light_instanced.fs
@@ -0,0 +1,12 @@
+#version 100
+
+uniform vec4 uniform_color;
+uniform float emission_factor;
+
+// x = tainted, y = specular;
+varying vec2 intensity;
+
+void main()
+{
+    gl_FragColor = vec4(vec3(intensity.y) + uniform_color.rgb * (intensity.x + emission_factor), uniform_color.a);
+}
diff --git a/resources/shaders/ES/gouraud_light_instanced.vs b/resources/shaders/ES/gouraud_light_instanced.vs
new file mode 100644
index 000000000..0aebd7a0b
--- /dev/null
+++ b/resources/shaders/ES/gouraud_light_instanced.vs
@@ -0,0 +1,50 @@
+#version 100
+
+#define INTENSITY_CORRECTION 0.6
+
+// normalized values for (-0.6/1.31, 0.6/1.31, 1./1.31)
+const vec3 LIGHT_TOP_DIR = vec3(-0.4574957, 0.4574957, 0.7624929);
+#define LIGHT_TOP_DIFFUSE    (0.8 * INTENSITY_CORRECTION)
+#define LIGHT_TOP_SPECULAR   (0.125 * INTENSITY_CORRECTION)
+#define LIGHT_TOP_SHININESS  20.0
+
+// normalized values for (1./1.43, 0.2/1.43, 1./1.43)
+const vec3 LIGHT_FRONT_DIR = vec3(0.6985074, 0.1397015, 0.6985074);
+#define LIGHT_FRONT_DIFFUSE  (0.3 * INTENSITY_CORRECTION)
+
+#define INTENSITY_AMBIENT    0.3
+
+uniform mat4 view_model_matrix;
+uniform mat4 projection_matrix;
+uniform mat3 view_normal_matrix;
+
+// vertex attributes
+attribute vec3 v_position;
+attribute vec3 v_normal;
+// instance attributes
+attribute vec3 i_offset;
+attribute vec2 i_scales;
+
+// x = tainted, y = specular;
+varying vec2 intensity;
+
+void main()
+{
+    // First transform the normal into camera space and normalize the result.
+    vec3 eye_normal = normalize(view_normal_matrix * v_normal);
+    
+    // Compute the cos of the angle between the normal and lights direction. The light is directional so the direction is constant for every vertex.
+    // Since these two are normalized the cosine is the dot product. We also need to clamp the result to the [0,1] range.
+    float NdotL = max(dot(eye_normal, LIGHT_TOP_DIR), 0.0);
+
+    intensity.x = INTENSITY_AMBIENT + NdotL * LIGHT_TOP_DIFFUSE;
+    vec4 world_position = vec4(v_position * vec3(vec2(1.5 * i_scales.x), 1.5 * i_scales.y) + i_offset - vec3(0.0, 0.0, 0.5 * i_scales.y), 1.0);
+    vec4 eye_position = view_model_matrix * world_position;
+    intensity.y = LIGHT_TOP_SPECULAR * pow(max(dot(-normalize(eye_position.xyz), reflect(-LIGHT_TOP_DIR, eye_normal)), 0.0), LIGHT_TOP_SHININESS);
+
+    // Perform the same lighting calculation for the 2nd light source (no specular applied).
+    NdotL = max(dot(eye_normal, LIGHT_FRONT_DIR), 0.0);
+    intensity.x += NdotL * LIGHT_FRONT_DIFFUSE;
+
+    gl_Position = projection_matrix * eye_position;
+}
diff --git a/resources/shaders/ES/imgui.fs b/resources/shaders/ES/imgui.fs
new file mode 100644
index 000000000..2174f955d
--- /dev/null
+++ b/resources/shaders/ES/imgui.fs
@@ -0,0 +1,13 @@
+#version 100
+
+precision highp float;
+
+uniform sampler2D Texture;
+
+varying vec2 Frag_UV;
+varying vec4 Frag_Color;
+
+void main()
+{
+	gl_FragColor = Frag_Color * texture2D(Texture, Frag_UV.st);
+}
\ No newline at end of file
diff --git a/resources/shaders/ES/imgui.vs b/resources/shaders/ES/imgui.vs
new file mode 100644
index 000000000..7abb3f405
--- /dev/null
+++ b/resources/shaders/ES/imgui.vs
@@ -0,0 +1,17 @@
+#version 100
+
+uniform mat4 ProjMtx;
+
+attribute vec2 Position;
+attribute vec2 UV;
+attribute vec4 Color;
+
+varying vec2 Frag_UV;
+varying vec4 Frag_Color;
+
+void main()
+{
+	Frag_UV = UV;
+	Frag_Color = Color;
+    gl_Position = ProjMtx * vec4(Position.xy, 0.0, 1.0);
+}
\ No newline at end of file
diff --git a/resources/shaders/ES/mm_contour.fs b/resources/shaders/ES/mm_contour.fs
new file mode 100644
index 000000000..f27e5d38c
--- /dev/null
+++ b/resources/shaders/ES/mm_contour.fs
@@ -0,0 +1,10 @@
+#version 100
+
+precision highp float;
+
+uniform vec4 uniform_color;
+
+void main()
+{
+    gl_FragColor = uniform_color;
+}
diff --git a/resources/shaders/ES/mm_contour.vs b/resources/shaders/ES/mm_contour.vs
new file mode 100644
index 000000000..7142a5de6
--- /dev/null
+++ b/resources/shaders/ES/mm_contour.vs
@@ -0,0 +1,15 @@
+#version 100
+
+uniform mat4 view_model_matrix;
+uniform mat4 projection_matrix;
+uniform float offset;
+
+attribute vec3 v_position;
+
+void main()
+{
+    // Add small epsilon to z to solve z-fighting
+	vec4 clip_position = projection_matrix * view_model_matrix * vec4(v_position, 1.0);
+	clip_position.z -= offset * abs(clip_position.w);
+    gl_Position = clip_position;
+}
diff --git a/resources/shaders/ES/mm_gouraud.fs b/resources/shaders/ES/mm_gouraud.fs
new file mode 100644
index 000000000..4824753f1
--- /dev/null
+++ b/resources/shaders/ES/mm_gouraud.fs
@@ -0,0 +1,66 @@
+#version 100
+#extension GL_OES_standard_derivatives : enable
+
+precision highp float;
+
+#define INTENSITY_CORRECTION 0.6
+
+// normalized values for (-0.6/1.31, 0.6/1.31, 1./1.31)
+const vec3 LIGHT_TOP_DIR = vec3(-0.4574957, 0.4574957, 0.7624929);
+#define LIGHT_TOP_DIFFUSE    (0.8 * INTENSITY_CORRECTION)
+#define LIGHT_TOP_SPECULAR   (0.125 * INTENSITY_CORRECTION)
+#define LIGHT_TOP_SHININESS  20.0
+
+// normalized values for (1./1.43, 0.2/1.43, 1./1.43)
+const vec3 LIGHT_FRONT_DIR = vec3(0.6985074, 0.1397015, 0.6985074);
+#define LIGHT_FRONT_DIFFUSE  (0.3 * INTENSITY_CORRECTION)
+
+#define INTENSITY_AMBIENT    0.3
+
+const vec3  ZERO    = vec3(0.0, 0.0, 0.0);
+const float EPSILON = 0.0001;
+
+uniform vec4 uniform_color;
+
+uniform bool volume_mirrored;
+
+uniform mat4 view_model_matrix;
+uniform mat3 view_normal_matrix;
+
+varying vec3 clipping_planes_dots;
+varying vec4 model_pos;
+
+void main()
+{
+    if (any(lessThan(clipping_planes_dots, ZERO)))
+        discard;
+    vec3  color = uniform_color.rgb;
+    float alpha = uniform_color.a;
+
+    vec3 triangle_normal = normalize(cross(dFdx(model_pos.xyz), dFdy(model_pos.xyz)));
+#ifdef FLIP_TRIANGLE_NORMALS
+    triangle_normal = -triangle_normal;
+#endif
+
+    if (volume_mirrored)
+        triangle_normal = -triangle_normal;
+
+    // First transform the normal into camera space and normalize the result.
+    vec3 eye_normal = normalize(view_normal_matrix * triangle_normal);
+
+    // Compute the cos of the angle between the normal and lights direction. The light is directional so the direction is constant for every vertex.
+    // Since these two are normalized the cosine is the dot product. We also need to clamp the result to the [0,1] range.
+    float NdotL = max(dot(eye_normal, LIGHT_TOP_DIR), 0.0);
+
+    // x = diffuse, y = specular;
+    vec2 intensity = vec2(0.0);
+    intensity.x = INTENSITY_AMBIENT + NdotL * LIGHT_TOP_DIFFUSE;
+    vec3 position = (view_model_matrix * model_pos).xyz;
+    intensity.y = LIGHT_TOP_SPECULAR * pow(max(dot(-normalize(position), reflect(-LIGHT_TOP_DIR, eye_normal)), 0.0), LIGHT_TOP_SHININESS);
+
+    // Perform the same lighting calculation for the 2nd light source (no specular applied).
+    NdotL = max(dot(eye_normal, LIGHT_FRONT_DIR), 0.0);
+    intensity.x += NdotL * LIGHT_FRONT_DIFFUSE;
+
+    gl_FragColor = vec4(vec3(intensity.y) + color * intensity.x, alpha);
+}
diff --git a/resources/shaders/ES/mm_gouraud.vs b/resources/shaders/ES/mm_gouraud.vs
new file mode 100644
index 000000000..8ad5fca68
--- /dev/null
+++ b/resources/shaders/ES/mm_gouraud.vs
@@ -0,0 +1,28 @@
+#version 100
+
+const vec3 ZERO = vec3(0.0, 0.0, 0.0);
+
+uniform mat4 view_model_matrix;
+uniform mat4 projection_matrix;
+
+uniform mat4 volume_world_matrix;
+// Clipping plane, x = min z, y = max z. Used by the FFF and SLA previews to clip with a top / bottom plane.
+uniform vec2 z_range;
+// Clipping plane - general orientation. Used by the SLA gizmo.
+uniform vec4 clipping_plane;
+
+attribute vec3 v_position;
+
+varying vec3 clipping_planes_dots;
+varying vec4 model_pos;
+
+void main()
+{
+    model_pos = vec4(v_position, 1.0);
+    // Point in homogenous coordinates.
+    vec4 world_pos = volume_world_matrix * model_pos;
+
+    gl_Position = projection_matrix * view_model_matrix * model_pos;
+    // Fill in the scalars for fragment shader clipping. Fragments with any of these components lower than zero are discarded.
+    clipping_planes_dots = vec3(dot(world_pos, clipping_plane), world_pos.z - z_range.x, z_range.y - world_pos.z);
+}
diff --git a/resources/shaders/ES/printbed.fs b/resources/shaders/ES/printbed.fs
new file mode 100644
index 000000000..517536467
--- /dev/null
+++ b/resources/shaders/ES/printbed.fs
@@ -0,0 +1,38 @@
+#version 100
+
+precision highp float;
+
+const vec3 back_color_dark  = vec3(0.235, 0.235, 0.235);
+const vec3 back_color_light = vec3(0.365, 0.365, 0.365);
+
+uniform sampler2D texture;
+uniform bool transparent_background;
+uniform bool svg_source;
+
+varying vec2 tex_coord;
+
+vec4 svg_color()
+{
+    // takes foreground from texture
+    vec4 fore_color = texture2D(texture, tex_coord);
+
+    // calculates radial gradient
+    vec3 back_color = vec3(mix(back_color_light, back_color_dark, smoothstep(0.0, 0.5, length(abs(tex_coord.xy) - vec2(0.5)))));
+
+    // blends foreground with background
+    return vec4(mix(back_color, fore_color.rgb, fore_color.a), transparent_background ? fore_color.a : 1.0);
+}
+
+vec4 non_svg_color()
+{
+    // takes foreground from texture
+    vec4 color = texture2D(texture, tex_coord);
+    return vec4(color.rgb, transparent_background ? color.a * 0.25 : color.a);
+}
+
+void main()
+{
+	vec4 color = svg_source ? svg_color() : non_svg_color();
+	color.a = transparent_background ? color.a * 0.5 : color.a;
+	gl_FragColor = color;
+}
\ No newline at end of file
diff --git a/resources/shaders/ES/printbed.vs b/resources/shaders/ES/printbed.vs
new file mode 100644
index 000000000..e83cacd59
--- /dev/null
+++ b/resources/shaders/ES/printbed.vs
@@ -0,0 +1,15 @@
+#version 100
+
+uniform mat4 view_model_matrix;
+uniform mat4 projection_matrix;
+
+attribute vec3 v_position;
+attribute vec2 v_tex_coord;
+
+varying vec2 tex_coord;
+
+void main()
+{
+	tex_coord = v_tex_coord;
+    gl_Position = projection_matrix * view_model_matrix * vec4(v_position, 1.0);
+}
diff --git a/resources/shaders/ES/toolpaths_cog.fs b/resources/shaders/ES/toolpaths_cog.fs
new file mode 100644
index 000000000..f5e4404be
--- /dev/null
+++ b/resources/shaders/ES/toolpaths_cog.fs
@@ -0,0 +1,21 @@
+#version 100
+
+precision highp float;
+
+const vec4 BLACK = vec4(vec3(0.1), 1.0);
+const vec4 WHITE = vec4(vec3(1.0), 1.0);
+
+const float emission_factor = 0.25;
+
+uniform vec3 world_center;
+
+// x = tainted, y = specular;
+varying vec2 intensity;
+varying vec3 world_position;
+
+void main()
+{
+    vec3 delta = world_position - world_center;
+    vec4 color = delta.x * delta.y * delta.z > 0.0 ? BLACK : WHITE;
+    gl_FragColor = vec4(vec3(intensity.y) + color.rgb * (intensity.x + emission_factor), 1.0);
+}
diff --git a/resources/shaders/ES/toolpaths_cog.vs b/resources/shaders/ES/toolpaths_cog.vs
new file mode 100644
index 000000000..72b5835bd
--- /dev/null
+++ b/resources/shaders/ES/toolpaths_cog.vs
@@ -0,0 +1,47 @@
+#version 100
+
+#define INTENSITY_CORRECTION 0.6
+
+// normalized values for (-0.6/1.31, 0.6/1.31, 1./1.31)
+const vec3 LIGHT_TOP_DIR = vec3(-0.4574957, 0.4574957, 0.7624929);
+#define LIGHT_TOP_DIFFUSE    (0.8 * INTENSITY_CORRECTION)
+#define LIGHT_TOP_SPECULAR   (0.125 * INTENSITY_CORRECTION)
+#define LIGHT_TOP_SHININESS  20.0
+
+// normalized values for (1./1.43, 0.2/1.43, 1./1.43)
+const vec3 LIGHT_FRONT_DIR = vec3(0.6985074, 0.1397015, 0.6985074);
+#define LIGHT_FRONT_DIFFUSE  (0.3 * INTENSITY_CORRECTION)
+
+#define INTENSITY_AMBIENT    0.3
+
+uniform mat4 view_model_matrix;
+uniform mat4 projection_matrix;
+uniform mat3 view_normal_matrix;
+
+attribute vec3 v_position;
+attribute vec3 v_normal;
+
+// x = tainted, y = specular;
+varying vec2 intensity;
+varying vec3 world_position;
+
+void main()
+{
+    // First transform the normal into camera space and normalize the result.
+    vec3 normal = normalize(view_normal_matrix * v_normal);
+    
+    // Compute the cos of the angle between the normal and lights direction. The light is directional so the direction is constant for every vertex.
+    // Since these two are normalized the cosine is the dot product. We also need to clamp the result to the [0,1] range.
+    float NdotL = max(dot(normal, LIGHT_TOP_DIR), 0.0);
+
+    intensity.x = INTENSITY_AMBIENT + NdotL * LIGHT_TOP_DIFFUSE;
+    vec4 position = view_model_matrix * vec4(v_position, 1.0);
+    intensity.y = LIGHT_TOP_SPECULAR * pow(max(dot(-normalize(position.xyz), reflect(-LIGHT_TOP_DIR, normal)), 0.0), LIGHT_TOP_SHININESS);
+
+    // Perform the same lighting calculation for the 2nd light source (no specular applied).
+    NdotL = max(dot(normal, LIGHT_FRONT_DIR), 0.0);
+    intensity.x += NdotL * LIGHT_FRONT_DIFFUSE;
+
+	world_position = v_position;
+    gl_Position = projection_matrix * position;
+}
diff --git a/resources/shaders/ES/variable_layer_height.fs b/resources/shaders/ES/variable_layer_height.fs
new file mode 100644
index 000000000..ac96f31b7
--- /dev/null
+++ b/resources/shaders/ES/variable_layer_height.fs
@@ -0,0 +1,44 @@
+#version 100
+#extension GL_OES_standard_derivatives : enable
+
+precision highp float;
+
+#define M_PI 3.1415926535897932384626433832795
+
+// 2D texture (1D texture split by the rows) of color along the object Z axis.
+uniform sampler2D z_texture;
+// Scaling from the Z texture rows coordinate to the normalized texture row coordinate.
+uniform float z_to_texture_row;
+uniform float z_texture_row_to_normalized;
+uniform float z_cursor;
+uniform float z_cursor_band_width;
+
+// x = tainted, y = specular;
+varying vec2 intensity;
+
+varying float object_z;
+
+void main()
+{
+    float object_z_row = z_to_texture_row * object_z;
+    // Index of the row in the texture.
+    float z_texture_row = floor(object_z_row);
+    // Normalized coordinate from 0. to 1.
+    float z_texture_col = object_z_row - z_texture_row;
+    float z_blend = 0.25 * cos(min(M_PI, abs(M_PI * (object_z - z_cursor) * 1.8 / z_cursor_band_width))) + 0.25;
+    // Calculate level of detail from the object Z coordinate.
+    // This makes the slowly sloping surfaces to be shown with high detail (with stripes),
+    // and the vertical surfaces to be shown with low detail (no stripes)
+    float z_in_cells = object_z_row * 190.;
+    // Gradient of Z projected on the screen.
+    float dx_vtc = dFdx(z_in_cells);
+    float dy_vtc = dFdy(z_in_cells);
+    float lod = clamp(0.5 * log2(max(dx_vtc * dx_vtc, dy_vtc * dy_vtc)), 0., 1.);
+    // Sample the Z texture. Texture coordinates are normalized to <0, 1>.
+    vec4 color = vec4(0.25, 0.25, 0.25, 1.0);
+    if (z_texture_row >= 0.0)
+        color = mix(texture2D(z_texture, vec2(z_texture_col, z_texture_row_to_normalized * (z_texture_row + 0.5    )), -10000.),
+                    texture2D(z_texture, vec2(z_texture_col, z_texture_row_to_normalized * (z_texture_row * 2. + 1.)),  10000.), lod);            
+    // Mix the final color.
+    gl_FragColor = vec4(vec3(intensity.y), 1.0) +  intensity.x * mix(color, vec4(1.0, 1.0, 0.0, 1.0), z_blend);
+}
diff --git a/resources/shaders/ES/variable_layer_height.vs b/resources/shaders/ES/variable_layer_height.vs
new file mode 100644
index 000000000..8deaf8368
--- /dev/null
+++ b/resources/shaders/ES/variable_layer_height.vs
@@ -0,0 +1,60 @@
+#version 100
+
+#define INTENSITY_CORRECTION 0.6
+
+const vec3 LIGHT_TOP_DIR = vec3(-0.4574957, 0.4574957, 0.7624929);
+#define LIGHT_TOP_DIFFUSE    (0.8 * INTENSITY_CORRECTION)
+#define LIGHT_TOP_SPECULAR   (0.125 * INTENSITY_CORRECTION)
+#define LIGHT_TOP_SHININESS  20.0
+
+const vec3 LIGHT_FRONT_DIR = vec3(0.6985074, 0.1397015, 0.6985074);
+#define LIGHT_FRONT_DIFFUSE  (0.3 * INTENSITY_CORRECTION)
+//#define LIGHT_FRONT_SPECULAR (0.0 * INTENSITY_CORRECTION)
+//#define LIGHT_FRONT_SHININESS 5.0
+
+#define INTENSITY_AMBIENT    0.3
+
+uniform mat4 view_model_matrix;
+uniform mat4 projection_matrix;
+uniform mat3 view_normal_matrix;
+uniform mat4 volume_world_matrix;
+uniform float object_max_z;
+
+attribute vec3 v_position;
+attribute vec3 v_normal;
+attribute vec2 v_tex_coord;
+
+// x = tainted, y = specular;
+varying vec2 intensity;
+
+varying float object_z;
+
+void main()
+{
+	// =====================================================
+	// NOTE:
+	// when object_max_z > 0.0  we are rendering the overlay
+	// when object_max_z == 0.0 we are rendering the volumes
+	// =====================================================
+
+    // First transform the normal into camera space and normalize the result.
+    vec3 normal = (object_max_z > 0.0) ? vec3(0.0, 0.0, 1.0) : normalize(view_normal_matrix * v_normal);
+    
+    // Compute the cos of the angle between the normal and lights direction. The light is directional so the direction is constant for every vertex.
+    // Since these two are normalized the cosine is the dot product. We also need to clamp the result to the [0,1] range.
+    float NdotL = max(dot(normal, LIGHT_TOP_DIR), 0.0);
+
+    intensity.x = INTENSITY_AMBIENT + NdotL * LIGHT_TOP_DIFFUSE;
+    vec4 position = view_model_matrix * vec4(v_position, 1.0);
+    intensity.y = LIGHT_TOP_SPECULAR * pow(max(dot(-normalize(position.xyz), reflect(-LIGHT_TOP_DIR, normal)), 0.0), LIGHT_TOP_SHININESS);
+
+    // Perform the same lighting calculation for the 2nd light source (no specular)
+    NdotL = max(dot(normal, LIGHT_FRONT_DIR), 0.0);
+    
+    intensity.x += NdotL * LIGHT_FRONT_DIFFUSE;
+
+    // Scaled to widths of the Z texture.
+    object_z = (object_max_z > 0.0) ? object_max_z * v_tex_coord.y : (volume_world_matrix * vec4(v_position, 1.0)).z;
+        
+    gl_Position = projection_matrix * position;
+}
diff --git a/resources/shaders/ES/wireframe.fs b/resources/shaders/ES/wireframe.fs
new file mode 100644
index 000000000..036ee8879
--- /dev/null
+++ b/resources/shaders/ES/wireframe.fs
@@ -0,0 +1,19 @@
+#version 100
+#extension GL_OES_standard_derivatives : enable
+
+// see for reference: https://stackoverflow.com/questions/7361582/opengl-debugging-single-pass-wireframe-rendering
+
+precision highp float;
+
+uniform vec4 uniform_color;
+
+varying vec3 barycentric;
+
+void main()
+{
+    float min_dist = min(min(barycentric.x, barycentric.y), barycentric.z);
+	if (min_dist > 0.5 * fwidth(min_dist))
+		discard;
+	
+    gl_FragColor = uniform_color;
+}
\ No newline at end of file
diff --git a/resources/shaders/ES/wireframe.vs b/resources/shaders/ES/wireframe.vs
new file mode 100644
index 000000000..00a5214f5
--- /dev/null
+++ b/resources/shaders/ES/wireframe.vs
@@ -0,0 +1,20 @@
+#version 100
+
+uniform mat4 view_model_matrix;
+uniform mat4 projection_matrix;
+uniform float offset;
+
+attribute vec3 v_position;
+attribute vec3 v_normal;
+attribute vec3 v_extra;
+
+varying vec3 barycentric;
+
+void main()
+{
+	barycentric = v_extra;
+    // Add small epsilon to z to solve z-fighting
+	vec4 clip_position = projection_matrix * view_model_matrix * vec4(v_position, 1.0);
+	clip_position.z -= offset * abs(clip_position.w);
+    gl_Position = clip_position;
+}
\ No newline at end of file