Added blend modes + minor fixed

Added blend modes (Dissolve, Multiply, Screen, Overlay, Hard Light, Soft Light).
Fixed color popup position in the GradientEditor.
Fixed initial panoram shown in preview.

addons/procedural_material/node_base.gd

@@ -18,6 +18,9 @@ func initialize_properties(object_list):
 		elif o is SpinBox:
 			set(o.name, o.value)
 			o.connect("value_changed", self, "_on_value_changed", [ o.name ])
+		elif o is OptionButton:
+			set(o.name, o.selected)
+			o.connect("item_selected", self, "_on_value_changed", [ o.name ])
 		elif o is ColorPickerButton:
 			set(o.name, o.color)
 			o.connect("color_changed", self, "_on_color_changed", [ o.name ])

addons/procedural_material/nodes/blend.gd

@@ -1,17 +1,24 @@
 tool
 extends "res://addons/procedural_material/node_base.gd"
 
+var blend_type = 0
 var amount = 0.0
 
-const blend_types = [
-	{ name="Normal", shortname="normal" }
+const BLEND_TYPES = [
+	{ name="Normal", shortname="normal" },
+	{ name="Dissolve", shortname="dissolve" },
+	{ name="Multiply", shortname="multiply" },
+	{ name="Screen", shortname="screen" },
+	{ name="Overlay", shortname="overlay" },
+	{ name="Hard Light", shortname="hard_light" },
+	{ name="Soft Light", shortname="soft_light" }
 ]
 
 func _ready():
-	initialize_properties([ $HBoxContainer/amount ])
-
-func color_to_string(c):
-	return "vec3("+str(c.r)+","+str(c.g)+","+str(c.b)+")"
+	$blend_type.clear()
+	for i in range(BLEND_TYPES.size()):
+		$blend_type.add_item(BLEND_TYPES[i].name, i)
+	initialize_properties([ $blend_type, $HBoxContainer/amount ])
 
 func _get_shader_code(uv):
 	var rv = { defs="", code="" }
@@ -34,8 +41,8 @@ func _get_shader_code(uv):
 		variant_index = generated_variants.size()
 		generated_variants.append(uv)
 		rv.code = src0_code.code+src1_code.code+src2_code.code
-		rv.code += "vec3 "+name+"_"+str(variant_index)+"_rgb = mix("+get_source_rgb(src0_code)+", "+get_source_rgb(src1_code)+", "+amount_str+");\n"
-	rv.rgb = name+"_"+str(variant_index)+"_rgb"
+		rv.code += "vec3 %s_%d_rgb = blend_%s(%s, %s, %s, %s);\n" % [ name, variant_index, BLEND_TYPES[blend_type].shortname, uv, src0_code.rgb, src1_code.rgb, amount_str ]
+	rv.rgb = "%s_%d_rgb" % [ name, variant_index ]
 	return rv
 
 func _get_state_variables():

addons/procedural_material/nodes/blend.tscn

@@ -55,7 +55,7 @@ slot/3/right_color = Color( 0.5, 0.5, 1, 1 )
 script = ExtResource( 1 )
 _sections_unfolded = [ "Theme", "slot", "slot/1" ]
 
-[node name="OptionButton" type="OptionButton" parent="." index="0"]
+[node name="blend_type" type="OptionButton" parent="." index="0"]
 
 anchor_left = 0.0
 anchor_top = 0.0

addons/procedural_material/pm_editor.tscn

@@ -4,7 +4,7 @@
 [ext_resource path="res://addons/procedural_material/graph_edit.gd" type="Script" id=2]
 [ext_resource path="res://addons/procedural_material/nodes/material.tscn" type="PackedScene" id=3]
 [ext_resource path="res://addons/procedural_material/preview.gd" type="Script" id=4]
-[ext_resource path="res://addons/procedural_material/panoramas/experiment.hdr" type="Texture" id=5]
+[ext_resource path="res://addons/procedural_material/panoramas/night.hdr" type="Texture" id=5]
 
 [sub_resource type="Animation" id=1]
 
@@ -514,7 +514,7 @@ _sections_unfolded = [ "GUI", "Render Target" ]
 
 [node name="Objects" type="Spatial" parent="Preview/Preview/MaterialPreview" index="0"]
 
-transform = Transform( -0.0548036, 0, 0.998495, 0, 1, 0, -0.998495, 0, -0.0548036, 0, 0, 0 )
+transform = Transform( 0.277021, 0, -0.960862, 0, 1, 0, 0.960862, 0, 0.277021, 0, 0, 0 )
 _sections_unfolded = [ "Transform" ]
 
 [node name="Cube" type="MeshInstance" parent="Preview/Preview/MaterialPreview/Objects" index="0"]

addons/procedural_material/preview.gd

@@ -15,6 +15,7 @@ func _ready():
 	$MaterialPreview/Objects/Cube.set_surface_material(0, preview_material)
 	$MaterialPreview/Objects/Cylinder.set_surface_material(0, preview_material)
 	$ObjectRotate.play("rotate")
+	_on_Environment_item_selected($Environment.selected)
 
 func _on_SelectedPreview_gui_input(ev):
 	if ev is InputEventMouseButton && ev.button_index == 1 && ev.doubleclick:

addons/procedural_material/shader_header.txt

@@ -13,8 +13,72 @@ vec3 rand3(vec2 x) {
                           dot(x, vec2(13.254, 5.867)))) * 43758.5453);
 }
 
+vec3 blend_normal(vec2 uv, vec3 c1, vec3 c2, float opacity) {
+	return opacity*c1 + (1.0-opacity)*c2;
+}
+
+vec3 blend_dissolve(vec2 uv, vec3 c1, vec3 c2, float opacity) {
+	if (rand(uv) < opacity) {
+		return c1;
+	} else {
+		return c2;
+	}
+}
+
+vec3 blend_multiply(vec2 uv, vec3 c1, vec3 c2, float opacity) {
+	return opacity*c1*c2 + (1.0-opacity)*c2;
+}
+
+vec3 blend_screen(vec2 uv, vec3 c1, vec3 c2, float opacity) {
+	return opacity*(1.0-(1.0-c1)*(1.0-c2)) + (1.0-opacity)*c2;
+}
+
+float blend_overlay_f(float c1, float c2) {
+	return (c1 < 0.5) ? (2.0*c1*c2) : (1.0-2.0*(1.0-c1)*(1.0-c2));
+}
+
+vec3 blend_overlay(vec2 uv, vec3 c1, vec3 c2, float opacity) {
+	return opacity*vec3(blend_overlay_f(c1.x, c2.x), blend_overlay_f(c1.y, c2.y), blend_overlay_f(c1.z, c2.z)) + (1.0-opacity)*c2;
+}
+
+vec3 blend_hard_light(vec2 uv, vec3 c1, vec3 c2, float opacity) {
+	return opacity*0.5*(c1*c2+blend_overlay(uv, c1, c2, 1.0)) + (1.0-opacity)*c2;
+}
+
+float blend_soft_light_f(float c1, float c2) {
+	return (c2 < 0.5) ? (2.0*c1*c2+c1*c1*(1.0-2.0*c2)) : 2.0*c1*(1.0-c2)+sqrt(c1)*(2.0*c2-1.0);
+}
+
+vec3 blend_soft_light(vec2 uv, vec3 c1, vec3 c2, float opacity) {
+	return opacity*vec3(blend_soft_light_f(c1.x, c2.x), blend_soft_light_f(c1.y, c2.y), blend_soft_light_f(c1.z, c2.z)) + (1.0-opacity)*c2;
+}
+
+float blend_burn_f(float c1, float c2) {
+	return (c1==0.0)?c1:max((1.0-((1.0-c2)/c1)),0.0);
+}
+
+vec3 blend_burn(vec2 uv, vec3 c1, vec3 c2, float opacity) {
+	return opacity*vec3(blend_burn_f(c1.x, c2.x), blend_burn_f(c1.y, c2.y), blend_burn_f(c1.z, c2.z)) + (1.0-opacity)*c2;
+}
+
+float blend_dodge_f(float c1, float c2) {
+	return (c1==1.0)?c1:min(c2/(1.0-c1),1.0);
+}
+
+vec3 blend_dodge(vec2 uv, vec3 c1, vec3 c2, float opacity) {
+	return opacity*vec3(blend_dodge_f(c1.x, c2.x), blend_dodge_f(c1.y, c2.y), blend_dodge_f(c1.z, c2.z)) + (1.0-opacity)*c2;
+}
+
+vec3 blend_lighten(vec2 uv, vec3 c1, vec3 c2, float opacity) {
+	return opacity*max(c1, c2) + (1.0-opacity)*c2;
+}
+
+vec3 blend_darken(vec2 uv, vec3 c1, vec3 c2, float opacity) {
+	return opacity*min(c1, c2) + (1.0-opacity)*c2;
+}
+
 float sine(vec2 uv, float count, float sharpness) {
-	return max(0.0, min(1.0, (0.5+sharpness*0.5*sin(count*3.1415928*2.0*uv.x))));
+	return clamp(0.5+sharpness*0.5*sin(count*3.1415928*2.0*uv.x), 0.0, 1.0);
 }
 
 vec2 transform(vec2 uv, float rotate, float scale) {

addons/procedural_material/widgets/gradient_editor.gd

@@ -13,7 +13,7 @@ class GradientCursor:
 	func _gui_input(ev):
 		if ev is InputEventMouseButton && ev.doubleclick:
 			if ev.button_index == 1:
-				get_parent().select_color(self)
+				get_parent().select_color(self, ev.global_position)
 			elif ev.button_index == 2 && get_parent().get_sorted_cursors().size() > 2:
 				var parent = get_parent()
 				parent.remove_child(self)
@@ -59,9 +59,10 @@ func _gui_input(ev):
 
 var active_cursor
 
-func select_color(cursor):
+func select_color(cursor, position):
 	active_cursor = cursor
 	$Gradient/Popup/ColorPicker.connect("color_changed", cursor, "set_color")
+	$Gradient/Popup.rect_position = position
 	$Gradient/Popup.popup()
 
 func _on_Popup_popup_hide():

addons/procedural_material/widgets/gradient_editor.tscn

@@ -86,8 +86,8 @@ anchor_right = 0.0
 anchor_bottom = 0.0
 margin_left = 4.0
 margin_top = 4.0
-margin_right = 4.0
-margin_bottom = 4.0
+margin_right = 302.0
+margin_bottom = 438.0
 rect_scale = Vector2( 0.75, 0.75 )
 rect_pivot_offset = Vector2( 0, 0 )
 rect_clip_content = false

generated_image.png.import

@@ -1,29 +0,0 @@
-[remap]
-
-importer="texture"
-type="StreamTexture"
-path="res://.import/generated_image.png-791fdae0ab5829f929b4d82eecbe4bc3.stex"
-
-[deps]
-
-source_file="res://generated_image.png"
-dest_files=[ "res://.import/generated_image.png-791fdae0ab5829f929b4d82eecbe4bc3.stex" ]
-
-[params]
-
-compress/mode=0
-compress/lossy_quality=0.7
-compress/hdr_mode=0
-compress/normal_map=0
-flags/repeat=0
-flags/filter=true
-flags/mipmaps=false
-flags/anisotropic=false
-flags/srgb=2
-process/fix_alpha_border=true
-process/premult_alpha=false
-process/HDR_as_SRGB=false
-stream=false
-size_limit=0
-detect_3d=true
-svg/scale=1.0