Implement a global shader parameter passing system and useful shaders

1 files changed, 51 insertions, 1 deletions

diff --git a/src/game.cpp b/src/game.cpp
index 1339afbf0..0c1a21370 100644
--- a/src/game.cpp
+++ b/src/game.cpp
@@ -24,6 +24,7 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 #include <IGUIButton.h>
 #include <IGUIStaticText.h>
 #include <IGUIFont.h>
+#include <IMaterialRendererServices.h>
 #include "client.h"
 #include "server.h"
 #include "guiPauseMenu.h"
@@ -835,6 +836,49 @@ public:
 	}
 };
 
+class GameGlobalShaderConstantSetter : public IShaderConstantSetter
+{
+	Sky *m_sky;
+	bool *m_force_fog_off;
+	f32 *m_fog_range;
+
+public:
+	GameGlobalShaderConstantSetter(Sky *sky, bool *force_fog_off,
+			f32 *fog_range):
+		m_sky(sky),
+		m_force_fog_off(force_fog_off),
+		m_fog_range(fog_range)
+	{}
+	~GameGlobalShaderConstantSetter() {}
+
+	virtual void onSetConstants(video::IMaterialRendererServices *services,
+			bool is_highlevel)
+	{
+		if(!is_highlevel)
+			return;
+
+		// Background color
+		video::SColor bgcolor = m_sky->getBgColor();
+		video::SColorf bgcolorf(bgcolor);
+		float bgcolorfa[4] = {
+			bgcolorf.r,
+			bgcolorf.g,
+			bgcolorf.b,
+			bgcolorf.a,
+		};
+		services->setPixelShaderConstant("skyBgColor", bgcolorfa, 4);
+
+		// Fog distance
+		float fog_distance = *m_fog_range;
+		if(*m_force_fog_off)
+			fog_distance = 10000*BS;
+		services->setPixelShaderConstant("fogDistance", &fog_distance, 1);
+	}
+
+private:
+	IrrlichtDevice *m_device;
+};
+
 void the_game(
 	bool &kill,
 	bool random_input,
@@ -1250,6 +1294,7 @@ void the_game(
 	bool show_hud = true;
 	bool show_chat = true;
 	bool force_fog_off = false;
+	f32 fog_range = 100*BS;
 	bool disable_camera_update = false;
 	bool show_debug = g_settings->getBool("show_debug");
 	bool show_profiler_graph = false;
@@ -1260,6 +1305,12 @@ void the_game(
 	float time_of_day_smooth = 0;
 
 	/*
+		Shader constants
+	*/
+	shsrc->addGlobalConstantSetter(
+			new GameGlobalShaderConstantSetter(sky, &force_fog_off, &fog_range));
+
+	/*
 		Main loop
 	*/
 
@@ -2434,7 +2485,6 @@ void the_game(
 			Fog range
 		*/
 	
-		f32 fog_range;
 		if(farmesh)
 		{
 			fog_range = BS*farmesh_range;