Refactored 2D shader and lighting system

-Removed normal/specular properties from nodes
-Create CanvasTexture, which can contain normal/specular channels
-Refactored, optimized and simplified 2D shaders
-Use atlas for light textures.
-Use a shadow atlas for shadow textures.
-Use both items aboves to make light rendering stateless (faster).
-Reorganized uniform sets for more efficiency.

1 files changed, 50 insertions, 33 deletions

diff --git a/servers/rendering_server.h b/servers/rendering_server.h
index e50170bdf7..61d0fed52f 100644
--- a/servers/rendering_server.h
+++ b/servers/rendering_server.h
@@ -661,6 +661,25 @@ public:
 
 	/* VIEWPORT TARGET API */
 
+	enum CanvasItemTextureFilter {
+		CANVAS_ITEM_TEXTURE_FILTER_DEFAULT, //uses canvas item setting for draw command, uses global setting for canvas item
+		CANVAS_ITEM_TEXTURE_FILTER_NEAREST,
+		CANVAS_ITEM_TEXTURE_FILTER_LINEAR,
+		CANVAS_ITEM_TEXTURE_FILTER_NEAREST_WITH_MIPMAPS,
+		CANVAS_ITEM_TEXTURE_FILTER_LINEAR_WITH_MIPMAPS,
+		CANVAS_ITEM_TEXTURE_FILTER_NEAREST_WITH_MIPMAPS_ANISOTROPIC,
+		CANVAS_ITEM_TEXTURE_FILTER_LINEAR_WITH_MIPMAPS_ANISOTROPIC,
+		CANVAS_ITEM_TEXTURE_FILTER_MAX
+	};
+
+	enum CanvasItemTextureRepeat {
+		CANVAS_ITEM_TEXTURE_REPEAT_DEFAULT, //uses canvas item setting for draw command, uses global setting for canvas item
+		CANVAS_ITEM_TEXTURE_REPEAT_DISABLED,
+		CANVAS_ITEM_TEXTURE_REPEAT_ENABLED,
+		CANVAS_ITEM_TEXTURE_REPEAT_MIRROR,
+		CANVAS_ITEM_TEXTURE_REPEAT_MAX,
+	};
+
 	virtual RID viewport_create() = 0;
 
 	virtual void viewport_set_use_xr(RID p_viewport, bool p_use_xr) = 0;
@@ -702,6 +721,9 @@ public:
 	virtual void viewport_set_canvas_transform(RID p_viewport, RID p_canvas, const Transform2D &p_offset) = 0;
 	virtual void viewport_set_transparent_background(RID p_viewport, bool p_enabled) = 0;
 
+	virtual void viewport_set_default_canvas_item_texture_filter(RID p_viewport, CanvasItemTextureFilter p_filter) = 0;
+	virtual void viewport_set_default_canvas_item_texture_repeat(RID p_viewport, CanvasItemTextureRepeat p_repeat) = 0;
+
 	virtual void viewport_set_global_canvas_transform(RID p_viewport, const Transform2D &p_transform) = 0;
 	virtual void viewport_set_canvas_stacking(RID p_viewport, RID p_canvas, int p_layer, int p_sublayer) = 0;
 
@@ -1092,9 +1114,26 @@ public:
 
 	virtual void canvas_set_disable_scale(bool p_disable) = 0;
 
+	virtual RID canvas_texture_create() = 0;
+
+	enum CanvasTextureChannel {
+		CANVAS_TEXTURE_CHANNEL_DIFFUSE,
+		CANVAS_TEXTURE_CHANNEL_NORMAL,
+		CANVAS_TEXTURE_CHANNEL_SPECULAR,
+	};
+	virtual void canvas_texture_set_channel(RID p_canvas_texture, CanvasTextureChannel p_channel, RID p_texture) = 0;
+	virtual void canvas_texture_set_shading_parameters(RID p_canvas_texture, const Color &p_base_color, float p_shininess) = 0;
+
+	//takes effect only for new draw commands
+	virtual void canvas_texture_set_texture_filter(RID p_canvas_texture, CanvasItemTextureFilter p_filter) = 0;
+	virtual void canvas_texture_set_texture_repeat(RID p_canvas_texture, CanvasItemTextureRepeat p_repeat) = 0;
+
 	virtual RID canvas_item_create() = 0;
 	virtual void canvas_item_set_parent(RID p_item, RID p_parent) = 0;
 
+	virtual void canvas_item_set_default_texture_filter(RID p_item, CanvasItemTextureFilter p_filter) = 0;
+	virtual void canvas_item_set_default_texture_repeat(RID p_item, CanvasItemTextureRepeat p_repeat) = 0;
+
 	virtual void canvas_item_set_visible(RID p_item, bool p_visible) = 0;
 	virtual void canvas_item_set_light_mask(RID p_item, int p_mask) = 0;
 
@@ -1115,43 +1154,20 @@ public:
 		NINE_PATCH_TILE_FIT,
 	};
 
-	enum CanvasItemTextureFilter {
-		CANVAS_ITEM_TEXTURE_FILTER_DEFAULT, //uses canvas item setting for draw command, uses global setting for canvas item
-		CANVAS_ITEM_TEXTURE_FILTER_NEAREST,
-		CANVAS_ITEM_TEXTURE_FILTER_LINEAR,
-		CANVAS_ITEM_TEXTURE_FILTER_NEAREST_WITH_MIPMAPS,
-		CANVAS_ITEM_TEXTURE_FILTER_LINEAR_WITH_MIPMAPS,
-		CANVAS_ITEM_TEXTURE_FILTER_NEAREST_WITH_MIPMAPS_ANISOTROPIC,
-		CANVAS_ITEM_TEXTURE_FILTER_LINEAR_WITH_MIPMAPS_ANISOTROPIC,
-		CANVAS_ITEM_TEXTURE_FILTER_MAX
-	};
-
-	enum CanvasItemTextureRepeat {
-		CANVAS_ITEM_TEXTURE_REPEAT_DEFAULT, //uses canvas item setting for draw command, uses global setting for canvas item
-		CANVAS_ITEM_TEXTURE_REPEAT_DISABLED,
-		CANVAS_ITEM_TEXTURE_REPEAT_ENABLED,
-		CANVAS_ITEM_TEXTURE_REPEAT_MIRROR,
-		CANVAS_ITEM_TEXTURE_REPEAT_MAX,
-	};
-
-	//takes effect only for new draw commands
-	virtual void canvas_item_set_default_texture_filter(RID p_item, CanvasItemTextureFilter p_filter) = 0;
-	virtual void canvas_item_set_default_texture_repeat(RID p_item, CanvasItemTextureRepeat p_repeat) = 0;
-
 	virtual void canvas_item_add_line(RID p_item, const Point2 &p_from, const Point2 &p_to, const Color &p_color, float p_width = 1.0) = 0;
 	virtual void canvas_item_add_polyline(RID p_item, const Vector<Point2> &p_points, const Vector<Color> &p_colors, float p_width = 1.0) = 0;
 	virtual void canvas_item_add_multiline(RID p_item, const Vector<Point2> &p_points, const Vector<Color> &p_colors, float p_width = 1.0) = 0;
 	virtual void canvas_item_add_rect(RID p_item, const Rect2 &p_rect, const Color &p_color) = 0;
 	virtual void canvas_item_add_circle(RID p_item, const Point2 &p_pos, float p_radius, const Color &p_color) = 0;
-	virtual void canvas_item_add_texture_rect(RID p_item, const Rect2 &p_rect, RID p_texture, bool p_tile = false, const Color &p_modulate = Color(1, 1, 1), bool p_transpose = false, RID p_normal_map = RID(), RID p_specular_map = RID(), const Color &p_specular_color_shininess = Color(), CanvasItemTextureFilter p_texture_filter = CANVAS_ITEM_TEXTURE_FILTER_DEFAULT, CanvasItemTextureRepeat = CANVAS_ITEM_TEXTURE_REPEAT_DEFAULT) = 0;
-	virtual void canvas_item_add_texture_rect_region(RID p_item, const Rect2 &p_rect, RID p_texture, const Rect2 &p_src_rect, const Color &p_modulate = Color(1, 1, 1), bool p_transpose = false, RID p_normal_map = RID(), RID p_specular_map = RID(), const Color &p_specular_color_shininess = Color(), bool p_clip_uv = false, CanvasItemTextureFilter p_texture_filter = CANVAS_ITEM_TEXTURE_FILTER_DEFAULT, CanvasItemTextureRepeat = CANVAS_ITEM_TEXTURE_REPEAT_DEFAULT) = 0;
-	virtual void canvas_item_add_nine_patch(RID p_item, const Rect2 &p_rect, const Rect2 &p_source, RID p_texture, const Vector2 &p_topleft, const Vector2 &p_bottomright, NinePatchAxisMode p_x_axis_mode = NINE_PATCH_STRETCH, NinePatchAxisMode p_y_axis_mode = NINE_PATCH_STRETCH, bool p_draw_center = true, const Color &p_modulate = Color(1, 1, 1), RID p_normal_map = RID(), RID p_specular_map = RID(), const Color &p_specular_color_shininess = Color(), CanvasItemTextureFilter p_texture_filter = CANVAS_ITEM_TEXTURE_FILTER_DEFAULT, CanvasItemTextureRepeat = CANVAS_ITEM_TEXTURE_REPEAT_DEFAULT) = 0;
-	virtual void canvas_item_add_primitive(RID p_item, const Vector<Point2> &p_points, const Vector<Color> &p_colors, const Vector<Point2> &p_uvs, RID p_texture, float p_width = 1.0, RID p_normal_map = RID(), RID p_specular_map = RID(), const Color &p_specular_color_shininess = Color(), CanvasItemTextureFilter p_texture_filter = CANVAS_ITEM_TEXTURE_FILTER_DEFAULT, CanvasItemTextureRepeat = CANVAS_ITEM_TEXTURE_REPEAT_DEFAULT) = 0;
-	virtual void canvas_item_add_polygon(RID p_item, const Vector<Point2> &p_points, const Vector<Color> &p_colors, const Vector<Point2> &p_uvs = Vector<Point2>(), RID p_texture = RID(), RID p_normal_map = RID(), RID p_specular_map = RID(), const Color &p_specular_color_shininess = Color(), CanvasItemTextureFilter p_texture_filter = CANVAS_ITEM_TEXTURE_FILTER_DEFAULT, CanvasItemTextureRepeat = CANVAS_ITEM_TEXTURE_REPEAT_DEFAULT) = 0;
-	virtual void canvas_item_add_triangle_array(RID p_item, const Vector<int> &p_indices, const Vector<Point2> &p_points, const Vector<Color> &p_colors, const Vector<Point2> &p_uvs = Vector<Point2>(), const Vector<int> &p_bones = Vector<int>(), const Vector<float> &p_weights = Vector<float>(), RID p_texture = RID(), int p_count = -1, RID p_normal_map = RID(), RID p_specular_map = RID(), const Color &p_specular_color_shininess = Color(), CanvasItemTextureFilter p_texture_filter = CANVAS_ITEM_TEXTURE_FILTER_DEFAULT, CanvasItemTextureRepeat = CANVAS_ITEM_TEXTURE_REPEAT_DEFAULT) = 0;
-	virtual void canvas_item_add_mesh(RID p_item, const RID &p_mesh, const Transform2D &p_transform = Transform2D(), const Color &p_modulate = Color(1, 1, 1), RID p_texture = RID(), RID p_normal_map = RID(), RID p_specular_map = RID(), const Color &p_specular_color_shininess = Color(), CanvasItemTextureFilter p_texture_filter = CANVAS_ITEM_TEXTURE_FILTER_DEFAULT, CanvasItemTextureRepeat = CANVAS_ITEM_TEXTURE_REPEAT_DEFAULT) = 0;
-	virtual void canvas_item_add_multimesh(RID p_item, RID p_mesh, RID p_texture = RID(), RID p_normal_map = RID(), RID p_specular_map = RID(), const Color &p_specular_color_shininess = Color(), CanvasItemTextureFilter p_texture_filter = CANVAS_ITEM_TEXTURE_FILTER_DEFAULT, CanvasItemTextureRepeat = CANVAS_ITEM_TEXTURE_REPEAT_DEFAULT) = 0;
-	virtual void canvas_item_add_particles(RID p_item, RID p_particles, RID p_texture, RID p_normal_map, RID p_specular_map = RID(), const Color &p_specular_color_shininess = Color(), CanvasItemTextureFilter p_texture_filter = CANVAS_ITEM_TEXTURE_FILTER_DEFAULT, CanvasItemTextureRepeat = CANVAS_ITEM_TEXTURE_REPEAT_DEFAULT) = 0;
+	virtual void canvas_item_add_texture_rect(RID p_item, const Rect2 &p_rect, RID p_texture, bool p_tile = false, const Color &p_modulate = Color(1, 1, 1), bool p_transpose = false) = 0;
+	virtual void canvas_item_add_texture_rect_region(RID p_item, const Rect2 &p_rect, RID p_texture, const Rect2 &p_src_rect, const Color &p_modulate = Color(1, 1, 1), bool p_transpose = false, bool p_clip_uv = false) = 0;
+	virtual void canvas_item_add_nine_patch(RID p_item, const Rect2 &p_rect, const Rect2 &p_source, RID p_texture, const Vector2 &p_topleft, const Vector2 &p_bottomright, NinePatchAxisMode p_x_axis_mode = NINE_PATCH_STRETCH, NinePatchAxisMode p_y_axis_mode = NINE_PATCH_STRETCH, bool p_draw_center = true, const Color &p_modulate = Color(1, 1, 1)) = 0;
+	virtual void canvas_item_add_primitive(RID p_item, const Vector<Point2> &p_points, const Vector<Color> &p_colors, const Vector<Point2> &p_uvs, RID p_texture, float p_width = 1.0) = 0;
+	virtual void canvas_item_add_polygon(RID p_item, const Vector<Point2> &p_points, const Vector<Color> &p_colors, const Vector<Point2> &p_uvs = Vector<Point2>(), RID p_texture = RID()) = 0;
+	virtual void canvas_item_add_triangle_array(RID p_item, const Vector<int> &p_indices, const Vector<Point2> &p_points, const Vector<Color> &p_colors, const Vector<Point2> &p_uvs = Vector<Point2>(), const Vector<int> &p_bones = Vector<int>(), const Vector<float> &p_weights = Vector<float>(), RID p_texture = RID(), int p_count = -1) = 0;
+	virtual void canvas_item_add_mesh(RID p_item, const RID &p_mesh, const Transform2D &p_transform = Transform2D(), const Color &p_modulate = Color(1, 1, 1), RID p_texture = RID()) = 0;
+	virtual void canvas_item_add_multimesh(RID p_item, RID p_mesh, RID p_texture = RID()) = 0;
+	virtual void canvas_item_add_particles(RID p_item, RID p_particles, RID p_texture) = 0;
 	virtual void canvas_item_add_set_transform(RID p_item, const Transform2D &p_transform) = 0;
 	virtual void canvas_item_add_clip_ignore(RID p_item, bool p_ignore) = 0;
 	virtual void canvas_item_set_sort_children_by_y(RID p_item, bool p_enable) = 0;
@@ -1200,7 +1216,6 @@ public:
 	};
 
 	virtual void canvas_light_set_shadow_enabled(RID p_light, bool p_enabled) = 0;
-	virtual void canvas_light_set_shadow_buffer_size(RID p_light, int p_size) = 0;
 	virtual void canvas_light_set_shadow_filter(RID p_light, CanvasLightShadowFilter p_filter) = 0;
 	virtual void canvas_light_set_shadow_color(RID p_light, const Color &p_color) = 0;
 	virtual void canvas_light_set_shadow_smooth(RID p_light, float p_smooth) = 0;
@@ -1224,6 +1239,8 @@ public:
 
 	virtual void canvas_occluder_polygon_set_cull_mode(RID p_occluder_polygon, CanvasOccluderPolygonCullMode p_mode) = 0;
 
+	virtual void canvas_set_shadow_texture_size(int p_size) = 0;
+
 	/* GLOBAL VARIABLES */
 
 	enum GlobalVariableType {