New shader feature: change the colour of shadows on a per-material basis.

Conflicts:
	drivers/gles2/shader_compiler_gles2.cpp

drivers/gles2/rasterizer_gles2.cpp

@@ -4637,6 +4637,9 @@ void RasterizerGLES2::_update_shader( Shader* p_shader) const {
 		if (light_flags.uses_light) {
 			enablers.push_back("#define USE_LIGHT_SHADER_CODE\n");
 		}
+		if (light_flags.uses_shadow_color) {
+			enablers.push_back("#define USE_LIGHT_SHADOW_COLOR\n");
+		}
 		if (light_flags.uses_time || fragment_flags.uses_time || vertex_flags.uses_time) {
 			enablers.push_back("#define USE_TIME\n");
 			uses_time=true;

drivers/gles2/shader_compiler_gles2.cpp

@@ -218,6 +218,10 @@ String ShaderCompilerGLES2::dump_node_code(SL::Node *p_node,int p_level,bool p_a
 					uses_light=true;
 				}
 
+				if (vnode->name==vname_shadow) {
+					uses_shadow_color=true;
+				}
+
 			}
 			if (type==ShaderLanguage::SHADER_CANVAS_ITEM_VERTEX) {
 
@@ -838,6 +842,7 @@ ShaderCompilerGLES2::ShaderCompilerGLES2() {
 
 	//////////////
 
+	mode_replace_table[ShaderLanguage::SHADER_MATERIAL_LIGHT]["TIME"]="time";
 	mode_replace_table[2]["NORMAL"]="normal";
 	//mode_replace_table[2]["POSITION"]="IN_POSITION";
 	mode_replace_table[2]["LIGHT_DIR"]="light_dir";
@@ -849,6 +854,7 @@ ShaderCompilerGLES2::ShaderCompilerGLES2() {
 	mode_replace_table[2]["SPECULAR_EXP"]="specular_exp";
 	mode_replace_table[2]["SHADE_PARAM"]="shade_param";
 	mode_replace_table[2]["LIGHT"]="light";
+	mode_replace_table[ShaderLanguage::SHADER_MATERIAL_LIGHT]["SHADOW"]="shadow_color";
 	mode_replace_table[2]["POINT_COORD"]="gl_PointCoord";
 	mode_replace_table[2]["TIME"]="time";
 

drivers/gles2/shaders/material.glsl

@@ -1175,6 +1175,10 @@ FRAGMENT_SHADER_CODE
 		vec3 mdiffuse = diffuse.rgb;
 		vec3 light;
 
+#if defined(USE_LIGHT_SHADOW_COLOR)
+		vec3 shadow_color=vec3(0.0,0.0,0.0);
+#endif
+
 #if defined(USE_LIGHT_SHADER_CODE)
 //light is written by the light shader
 {
@@ -1195,6 +1199,10 @@ LIGHT_SHADER_CODE
 #endif
 		diffuse.rgb = const_light_mult * ambient_light *diffuse.rgb + light * attenuation * shadow_attenuation;
 
+#if defined(USE_LIGHT_SHADOW_COLOR)
+		diffuse.rgb += light * shadow_color * attenuation * (1.0 - shadow_attenuation);
+#endif
+
 #ifdef USE_FOG
 
 		diffuse.rgb = mix(diffuse.rgb,fog_interp.rgb,fog_interp.a);

scene/resources/shader_graph.cpp

@@ -1435,6 +1435,7 @@ const ShaderGraph::InOutParamInfo ShaderGraph::inout_param_info[]={
 	{MODE_MATERIAL,SHADER_TYPE_LIGHT,"ShadeParam","SHADE_PARAM","",SLOT_TYPE_SCALAR,SLOT_IN},
 	//light out
 	{MODE_MATERIAL,SHADER_TYPE_LIGHT,"Light","LIGHT","",SLOT_TYPE_VEC,SLOT_OUT},
+	{MODE_MATERIAL,SHADER_TYPE_LIGHT,"Shadow", "SHADOW", "",SLOT_TYPE_VEC, SLOT_OUT },
 	//canvas item vertex in
 	{MODE_CANVAS_ITEM,SHADER_TYPE_VERTEX,"Vertex","vec3(SRC_VERTEX,0)","",SLOT_TYPE_VEC,SLOT_IN},
 	{MODE_CANVAS_ITEM,SHADER_TYPE_VERTEX,"UV","SRC_UV","",SLOT_TYPE_VEC,SLOT_IN},

servers/visual/shader_language.cpp

@@ -1112,7 +1112,8 @@ const ShaderLanguage::BuiltinsDef ShaderLanguage::light_builtins_defs[]={
 	{ "SPECULAR_EXP", TYPE_FLOAT},
 	{ "SHADE_PARAM", TYPE_FLOAT},
 	{ "LIGHT", TYPE_VEC3},
-	{ "POINT_COORD", TYPE_VEC2},
+	{ "SHADOW", TYPE_VEC3 },
+	{ "POINT_COORD", TYPE_VEC2 },
 //	{ "SCREEN_POS", TYPE_VEC2},
 //	{ "SCREEN_TEXEL_SIZE", TYPE_VEC2},
 	{ "TIME", TYPE_FLOAT},