From fdb40ef3f4f113279cc017a17b94ff2d625290f2 Mon Sep 17 00:00:00 2001
From: Marc Gilleron <marc.gilleron@gmail.com>
Date: Thu, 25 Apr 2019 00:54:14 +0100
Subject: [PATCH] Add quick support for isolevel in VoxelProviderImage

---
 voxel_provider_image.cpp | 29 +++++++++++++++++++----------
 voxel_provider_image.h   |  2 +-
 2 files changed, 20 insertions(+), 11 deletions(-)

diff --git a/voxel_provider_image.cpp b/voxel_provider_image.cpp
index 380c931..5dc2c7e 100644
--- a/voxel_provider_image.cpp
+++ b/voxel_provider_image.cpp
@@ -1,6 +1,7 @@
 #include "voxel_provider_image.h"
 
-VoxelProviderImage::VoxelProviderImage(): _channel(0) {
+VoxelProviderImage::VoxelProviderImage() :
+		_channel(0) {
 }
 
 void VoxelProviderImage::set_image(Ref<Image> im) {
@@ -11,7 +12,7 @@ Ref<Image> VoxelProviderImage::get_image() const {
 	return _image;
 }
 
-void VoxelProviderImage::set_channel(int channel) {
+void VoxelProviderImage::set_channel(VoxelBuffer::ChannelId channel) {
 	_channel = channel;
 }
 
@@ -46,13 +47,23 @@ void VoxelProviderImage::emerge_block(Ref<VoxelBuffer> p_out_buffer, Vector3i or
 		while (x < bs) {
 
 			Color c = image.get_pixel((ox + x) & im_wm, (oz + z) & im_hm);
-			int h = int(c.r * 200.0) - 50;
-			h -= oy;
-			if (h > 0) {
-				if (h > bs) {
-					h = bs;
+			float h = c.r * 200.0 - 50;
+
+			if (_channel == VoxelBuffer::CHANNEL_ISOLEVEL) {
+
+				for (int y = 0; y < bs; ++y) {
+					out_buffer.set_voxel_iso((oy + y) - h, x, y, z, _channel);
+				}
+
+			} else {
+				h -= oy;
+				int ih = int(h);
+				if (ih > 0) {
+					if (ih > bs) {
+						ih = bs;
+					}
+					out_buffer.fill_area(dirt, Vector3(x, 0, z), Vector3(x + 1, ih, z + 1), _channel);
 				}
-				out_buffer.fill_area(dirt, Vector3(x, 0, z), Vector3(x + 1, h, z + 1), _channel);
 			}
 
 			x += 1;
@@ -75,5 +86,3 @@ void VoxelProviderImage::_bind_methods() {
 	ADD_PROPERTY(PropertyInfo(Variant::OBJECT, "image", PROPERTY_HINT_RESOURCE_TYPE, "Image"), "set_image", "get_image");
 	ADD_PROPERTY(PropertyInfo(Variant::INT, "channel"), "set_channel", "get_channel");
 }
-
-
diff --git a/voxel_provider_image.h b/voxel_provider_image.h
index 54125ed..5d34211 100644
--- a/voxel_provider_image.h
+++ b/voxel_provider_image.h
@@ -14,7 +14,7 @@ public:
 	void set_image(Ref<Image> im);
 	Ref<Image> get_image() const;
 
-	void set_channel(int channel);
+	void set_channel(VoxelBuffer::ChannelId channel);
 	int get_channel() const;
 
 	void emerge_block(Ref<VoxelBuffer> p_out_buffer, Vector3i origin_in_voxels);