Changes to Light

-=-=-=-=-=-=-=-=

-Changed material unshaded property for an enum, which supports light-only shading
-Added a "Mix" shading mode, useful for using lights as masks
-Added energy parameter to Light2D

4 files changed, 49 insertions, 16 deletions

diff --git a/drivers/gles2/rasterizer_gles2.cpp b/drivers/gles2/rasterizer_gles2.cpp
index ae5f3d8f2f..3660be20db 100644
--- a/drivers/gles2/rasterizer_gles2.cpp
+++ b/drivers/gles2/rasterizer_gles2.cpp
@@ -4611,6 +4611,9 @@ void RasterizerGLES2::_update_shader( Shader* p_shader) const {
 		if (fragment_flags.uses_texpixel_size) {
 			enablers.push_back("#define USE_TEXPIXEL_SIZE\n");
 		}
+		if (light_flags.uses_shadow_color) {
+			enablers.push_back("#define USE_LIGHT_SHADOW_COLOR\n");
+		}
 
 		if (vertex_flags.uses_worldvec) {
 			enablers.push_back("#define USE_WORLD_VEC\n");
@@ -9260,7 +9263,9 @@ void RasterizerGLES2::canvas_render_items(CanvasItem *p_item_list,int p_z,const
 			_canvas_item_setup_shader_uniforms(material,shader_cache);
 		}
 
-		if (material && material->unshaded) {
+		bool unshaded = material && material->shading_mode==VS::CANVAS_ITEM_SHADING_UNSHADED;
+
+		if (unshaded) {
 			canvas_shader.set_uniform(CanvasShaderGLES2::MODULATE,Color(1,1,1,1));
 			reset_modulate=true;
 		} else if (reset_modulate) {
@@ -9317,13 +9322,15 @@ void RasterizerGLES2::canvas_render_items(CanvasItem *p_item_list,int p_z,const
 
 		canvas_opacity = ci->final_opacity;
 
-		_canvas_item_render_commands<false>(ci,current_clip,reclip);
 
-		if (canvas_blend_mode==VS::MATERIAL_BLEND_MODE_MIX && p_light && (!material || !material->unshaded)) {
+		if (unshaded || (p_modulate.a>0.001 && (!material || material->shading_mode!=VS::CANVAS_ITEM_SHADING_ONLY_LIGHT)))
+			_canvas_item_render_commands<false>(ci,current_clip,reclip);
+
+		if (canvas_blend_mode==VS::MATERIAL_BLEND_MODE_MIX && p_light && !unshaded) {
 
 			CanvasLight *light = p_light;
 			bool light_used=false;
-			bool subtract=false;
+			VS::CanvasLightMode mode=VS::CANVAS_LIGHT_MODE_ADD;
 
 
 			while(light) {
@@ -9332,21 +9339,28 @@ void RasterizerGLES2::canvas_render_items(CanvasItem *p_item_list,int p_z,const
 
 					//intersects this light
 
-					if (!light_used || subtract!=light->subtract) {
+					if (!light_used || mode!=light->mode) {
 
-						subtract=light->subtract;
+						mode=light->mode;
 
-						if (subtract) {
+						switch(mode) {
 
-							glBlendEquation(GL_FUNC_REVERSE_SUBTRACT);
-							glBlendFunc(GL_SRC_ALPHA,GL_ONE);
-
-						} else {
+							case VS::CANVAS_LIGHT_MODE_ADD: {
+								glBlendEquation(GL_FUNC_ADD);
+								glBlendFunc(GL_SRC_ALPHA,GL_ONE);
 
-							glBlendEquation(GL_FUNC_ADD);
-							glBlendFunc(GL_SRC_ALPHA,GL_ONE);
+							} break;
+							case VS::CANVAS_LIGHT_MODE_SUB: {
+								glBlendEquation(GL_FUNC_REVERSE_SUBTRACT);
+								glBlendFunc(GL_SRC_ALPHA,GL_ONE);
+							} break;
+							case VS::CANVAS_LIGHT_MODE_MIX: {
+								glBlendEquation(GL_FUNC_ADD);
+								glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
 
+							} break;
 						}
+
 					}
 
 					if (!light_used) {
@@ -9384,7 +9398,7 @@ void RasterizerGLES2::canvas_render_items(CanvasItem *p_item_list,int p_z,const
 
 					canvas_shader.set_uniform(CanvasShaderGLES2::LIGHT_MATRIX,light->light_shader_xform);
 					canvas_shader.set_uniform(CanvasShaderGLES2::LIGHT_POS,light->light_shader_pos);
-					canvas_shader.set_uniform(CanvasShaderGLES2::LIGHT_COLOR,light->color);
+					canvas_shader.set_uniform(CanvasShaderGLES2::LIGHT_COLOR,Color(light->color.r*light->energy,light->color.g*light->energy,light->color.b*light->energy,light->color.a));
 					canvas_shader.set_uniform(CanvasShaderGLES2::LIGHT_HEIGHT,light->height);
 					canvas_shader.set_uniform(CanvasShaderGLES2::LIGHT_LOCAL_MATRIX,light->xform_cache.affine_inverse());
 
diff --git a/drivers/gles2/shader_compiler_gles2.cpp b/drivers/gles2/shader_compiler_gles2.cpp
index 8d378ceec1..69bd269948 100644
--- a/drivers/gles2/shader_compiler_gles2.cpp
+++ b/drivers/gles2/shader_compiler_gles2.cpp
@@ -266,6 +266,9 @@ String ShaderCompilerGLES2::dump_node_code(SL::Node *p_node,int p_level,bool p_a
 					uses_normal=true;
 				}
 
+				if (vnode->name==vname_shadow) {
+					uses_shadow_color=true;
+				}
 
 			}
 
@@ -616,6 +619,7 @@ Error ShaderCompilerGLES2::compile(const String& p_code, ShaderLanguage::ShaderT
 	uses_texpixel_size=false;
 	uses_worldvec=false;
 	vertex_code_writes_vertex=false;
+	uses_shadow_color=false;
 	uniforms=r_uniforms;
 	flags=&r_flags;
 	r_flags.use_color_interp=false;
@@ -651,6 +655,7 @@ Error ShaderCompilerGLES2::compile(const String& p_code, ShaderLanguage::ShaderT
 	r_flags.uses_normal=uses_normal;
 	r_flags.uses_texpixel_size=uses_texpixel_size;
 	r_flags.uses_worldvec=uses_worldvec;
+	r_flags.uses_shadow_color=uses_shadow_color;
 	r_code_line=code;
 	r_globals_line=global_code;
 
@@ -827,7 +832,9 @@ ShaderCompilerGLES2::ShaderCompilerGLES2() {
 	mode_replace_table[5]["LIGHT_VEC"]="light_vec";
 	mode_replace_table[5]["LIGHT_HEIGHT"]="light_height";
 	mode_replace_table[5]["LIGHT_COLOR"]="light";
+	mode_replace_table[5]["LIGHT_UV"]="light_uv";
 	mode_replace_table[5]["LIGHT"]="light_out";
+	mode_replace_table[5]["SHADOW"]="shadow_color";
 	mode_replace_table[5]["SCREEN_UV"]="screen_uv";
 	mode_replace_table[5]["POINT_COORD"]="gl_PointCoord";
 	mode_replace_table[5]["TIME"]="time";
@@ -857,5 +864,6 @@ ShaderCompilerGLES2::ShaderCompilerGLES2() {
 	vname_normal="NORMAL";
 	vname_texpixel_size="TEXTURE_PIXEL_SIZE";
 	vname_world_vec="WORLD_VERTEX";
+	vname_shadow="SHADOW";
 
 }
diff --git a/drivers/gles2/shader_compiler_gles2.h b/drivers/gles2/shader_compiler_gles2.h
index 87722602fd..87016fd968 100644
--- a/drivers/gles2/shader_compiler_gles2.h
+++ b/drivers/gles2/shader_compiler_gles2.h
@@ -55,6 +55,7 @@ private:
 	bool uses_texpixel_size;
 	bool uses_worldvec;
 	bool vertex_code_writes_vertex;
+	bool uses_shadow_color;
 	Flags *flags;
 
 	StringName vname_discard;
@@ -74,6 +75,7 @@ private:
 	StringName vname_normal;
 	StringName vname_texpixel_size;
 	StringName vname_world_vec;
+	StringName vname_shadow;
 
 	Map<StringName,ShaderLanguage::Uniform> *uniforms;
 
@@ -110,6 +112,7 @@ public:
 		bool uses_normal;
 		bool uses_texpixel_size;
 		bool uses_worldvec;
+		bool uses_shadow_color;
 	};
 
 	Error compile(const String& p_code, ShaderLanguage::ShaderType p_type, String& r_code_line, String& r_globals_line, Flags& r_flags, Map<StringName,ShaderLanguage::Uniform> *r_uniforms=NULL);
diff --git a/drivers/gles2/shaders/canvas.glsl b/drivers/gles2/shaders/canvas.glsl
index baa7e664b5..bb47de6688 100644
--- a/drivers/gles2/shaders/canvas.glsl
+++ b/drivers/gles2/shaders/canvas.glsl
@@ -230,7 +230,11 @@ FRAGMENT_SHADER_CODE
 
 	float att=1.0;
 
-	vec4 light = texture2D(light_texture,light_uv_interp.xy) * light_color;	
+	vec2 light_uv = light_uv_interp.xy;
+	vec4 light = texture2D(light_texture,light_uv) * light_color;
+#if defined(USE_LIGHT_SHADOW_COLOR)
+	vec4 shadow_color=vec4(0.0,0.0,0.0,0.0);
+#endif
 
 #if defined(USE_LIGHT_SHADER_CODE)
 //light is written by the light shader
@@ -362,7 +366,11 @@ LIGHT_SHADER_CODE
 
 #endif
 
-		color.rgb*=shadow_attenuation;
+#if defined(USE_LIGHT_SHADOW_COLOR)
+	color=mix(shadow_color,color,shadow_attenuation);
+#else
+	color.rgb*=shadow_attenuation;
+#endif
 //use shadows
 #endif
 	}