From 2b9f28e5739d5163a27fcf97b404d670b41be4eb Mon Sep 17 00:00:00 2001
From: Relintai <relintai@gmail.com>
Date: Tue, 14 Jan 2020 22:26:40 +0100
Subject: [PATCH] Added scaled uv calculation to voxel surface. Think of
 terrarins, when the texture is bigger than one quad.

---
 library/voxel_surface.cpp | 18 ++++++++++++++++++
 library/voxel_surface.h   |  3 ++-
 2 files changed, 20 insertions(+), 1 deletion(-)

diff --git a/library/voxel_surface.cpp b/library/voxel_surface.cpp
index 742c74c..eb38a99 100644
--- a/library/voxel_surface.cpp
+++ b/library/voxel_surface.cpp
@@ -49,6 +49,23 @@ Vector2 VoxelSurface::transform_uv(const VoxelSurfaceSides p_side, const Vector2
 	return uv;
 }
 
+Vector2 VoxelSurface::transform_uv_scaled(const VoxelSurfaceSides p_side, const Vector2 p_uv, int p_current_x, int p_current_y, int p_max) const {
+	Vector2 uv = p_uv;
+
+	Rect2 r = _rects[p_side];
+
+	float sizex = r.size.x / static_cast<float>(p_max);
+	float sizey = r.size.x / static_cast<float>(p_max);
+
+	uv.x *= sizex;
+	uv.y *= sizey;
+
+	uv.x += r.position.x + sizex * p_current_x;
+	uv.y += r.position.y + sizey * p_current_y;
+
+	return uv;
+}
+
 void VoxelSurface::refresh_rects() {
 }
 
@@ -81,6 +98,7 @@ void VoxelSurface::_bind_methods() {
 	ClassDB::bind_method(D_METHOD("set_rect", "side", "rect"), &VoxelSurface::set_rect);
 
 	ClassDB::bind_method(D_METHOD("transform_uv", "side", "uv"), &VoxelSurface::transform_uv);
+	ClassDB::bind_method(D_METHOD("transform_uv_scaled", "side", "uv", "p_current_x", "p_current_y", "max"), &VoxelSurface::transform_uv_scaled);
 
 	ClassDB::bind_method(D_METHOD("refresh_rects"), &VoxelSurface::refresh_rects);
 
diff --git a/library/voxel_surface.h b/library/voxel_surface.h
index 36540b0..cba43dc 100644
--- a/library/voxel_surface.h
+++ b/library/voxel_surface.h
@@ -59,7 +59,8 @@ public:
 	Ref<VoxelmanLibrary> get_library() const;
 	void set_library(Ref<VoxelmanLibrary> library);
 
-	Vector2 transform_uv(const VoxelSurfaceSides side, const Vector2 uv) const;
+	Vector2 transform_uv(const VoxelSurfaceSides p_side, const Vector2 p_uv) const;
+	Vector2 transform_uv_scaled(const VoxelSurfaceSides p_side, const Vector2 p_uv, int p_current_x, int p_current_y, int p_max) const;
 
 	virtual void refresh_rects();