From: Mikko Rasa <tdb@tdb.fi>
Date: Thu, 6 May 2021 10:20:24 +0000 (+0300)
Subject: Add a property in Blender for a custom shadow shader
X-Git-Url: http://git.tdb.fi/?a=commitdiff_plain;h=7834588fc4f3846641bb9eed680a8890b8852a9a;p=libs%2Fgl.git

Add a property in Blender for a custom shadow shader

Since a shadow map doesn't have color output, it's useful to specify a
cheaper shader which only does vertex transformations.
---

diff --git a/blender/io_mspgl/export_material.py b/blender/io_mspgl/export_material.py
index d62276f7..2d85b10f 100644
--- a/blender/io_mspgl/export_material.py
+++ b/blender/io_mspgl/export_material.py
@@ -32,7 +32,13 @@ def create_technique_resource(material, resources):
 
 	if material.shadow_method!='NONE':
 		st = Statement("pass", "shadow")
-		st.sub.append(Statement("shader", "_occluder.glsl.shader"))
+		if material.render_mode=='CUSTOM':
+			shader = material.shadow_shader or material.shader
+			if shader.endswith(".glsl"):
+				shader += ".shader"
+			st.sub.append(Statement("shader", shader))
+		else:
+			st.sub.append(Statement("shader", "_occluder.glsl.shader"))
 		tech_res.statements.append(st)
 
 	return tech_res
diff --git a/blender/io_mspgl/properties.py b/blender/io_mspgl/properties.py
index 9d46e128..532528b8 100644
--- a/blender/io_mspgl/properties.py
+++ b/blender/io_mspgl/properties.py
@@ -85,6 +85,8 @@ class MspGLMaterialProperties(bpy.types.Panel):
 		self.layout.prop(mat, "render_mode")
 		if mat.render_mode=='CUSTOM':
 			self.layout.prop(mat, "shader")
+			if mat.shadow_method!='NONE':
+				self.layout.prop(mat, "shadow_shader")
 		elif mat.render_mode=='EXTERNAL':
 			self.layout.prop(mat, "technique")
 		if mat.render_mode=='BUILTIN':
@@ -225,7 +227,8 @@ def register_properties():
 			("CUSTOM", "Custom shader", "Use a custom shader"),
 			("EXTERNAL", "External technique", "Use an externally defined technique")))
 	bpy.types.Material.technique = bpy.props.StringProperty(name="Custom technique", description="Name of an external technique to use for rendering")
-	bpy.types.Material.shader = bpy.props.StringProperty(name="Custom shader", description="Name of an external technique to use for rendering")
+	bpy.types.Material.shader = bpy.props.StringProperty(name="Custom shader", description="Name of a custom shader to use for rendering")
+	bpy.types.Material.shadow_shader = bpy.props.StringProperty(name="Custom shadow shader", description="Name of a custom shader to use for shadow pass")
 	bpy.types.Material.receive_shadows = bpy.props.BoolProperty(name="Receive shadows", description="Receive shadows from a shadow map", default=True)
 	bpy.types.Material.image_based_lighting = bpy.props.BoolProperty(name="Image based lighting", description="Use an environment map for ambient lighting", default=False)
 	bpy.types.Material.array_atlas = bpy.props.BoolProperty(name="Texture array atlas", description="The material is stored in a texture array")