Implement Framebuffer Subpass support

* Required for better optimizing mobile platforms
* Will be used by the Vulkan mobile renderer.

2 files changed, 84 insertions, 1 deletions

diff --git a/doc/classes/RDFramebufferPass.xml b/doc/classes/RDFramebufferPass.xml
new file mode 100644
index 0000000000..c26c41f93f
--- /dev/null
+++ b/doc/classes/RDFramebufferPass.xml
@@ -0,0 +1,35 @@
+<?xml version="1.0" encoding="UTF-8" ?>
+<class name="RDFramebufferPass" inherits="RefCounted" version="4.0">
+	<brief_description>
+		Framebuffer pass attachment description.
+	</brief_description>
+	<description>
+		This class contains the list of attachment descriptions for a framebuffer pass. Each points with an index to a previously supplied list of texture attachments.
+	Multipass framebuffers can optimize some configurations in mobile, on desktop they provide little to no advantage.
+	</description>
+	<tutorials>
+	</tutorials>
+	<methods>
+	</methods>
+	<members>
+		<member name="color_attachments" type="PackedInt32Array" setter="set_color_attachments" getter="get_color_attachments" default="PackedInt32Array()">
+			Color attachments in order starting from 0. If this attachment is not used by the shader, pass ATTACHMENT_UNUSED to skip.
+		</member>
+		<member name="depth_attachment" type="int" setter="set_depth_attachment" getter="get_depth_attachment" default="-1">
+			Depth attachment. ATTACHMENT_UNUSED should be used if no depth buffer is required for this pass.
+		</member>
+		<member name="input_attachments" type="PackedInt32Array" setter="set_input_attachments" getter="get_input_attachments" default="PackedInt32Array()">
+			Used for multipass framebuffers (more than one render pass). Converts an attachment to an input. Make sure to also supply it properly in the [RDUniform] for the uniform set.
+		</member>
+		<member name="preserve_attachments" type="PackedInt32Array" setter="set_preserve_attachments" getter="get_preserve_attachments" default="PackedInt32Array()">
+			Attachments to preserve in this pass (otherwise they are erased).
+		</member>
+		<member name="resolve_attachments" type="PackedInt32Array" setter="set_resolve_attachments" getter="get_resolve_attachments" default="PackedInt32Array()">
+			If the color attachments are multisampled, non-multisampled resolve attachments can be provided.
+		</member>
+	</members>
+	<constants>
+		<constant name="ATTACHMENT_UNUSED" value="-1">
+		</constant>
+	</constants>
+</class>
diff --git a/doc/classes/RenderingDevice.xml b/doc/classes/RenderingDevice.xml
index dc56e6fd5d..b66b945025 100644
--- a/doc/classes/RenderingDevice.xml
+++ b/doc/classes/RenderingDevice.xml
@@ -341,13 +341,29 @@
 			<description>
 			</description>
 		</method>
+		<method name="draw_list_switch_to_next_pass">
+			<return type="int">
+			</return>
+			<description>
+			</description>
+		</method>
+		<method name="draw_list_switch_to_next_pass_split">
+			<return type="PackedInt64Array">
+			</return>
+			<argument index="0" name="splits" type="int">
+			</argument>
+			<description>
+			</description>
+		</method>
 		<method name="framebuffer_create">
 			<return type="RID">
 			</return>
-			<argument index="0" name="textures" type="Array">
+			<argument index="0" name="textures" type="RID[]">
 			</argument>
 			<argument index="1" name="validate_with_format" type="int" default="-1">
 			</argument>
+			<argument index="2" name="view_count" type="int" default="1">
+			</argument>
 			<description>
 			</description>
 		</method>
@@ -363,11 +379,27 @@
 			<description>
 			</description>
 		</method>
+		<method name="framebuffer_create_multipass">
+			<return type="RID">
+			</return>
+			<argument index="0" name="textures" type="RID[]">
+			</argument>
+			<argument index="1" name="passes" type="RDFramebufferPass[]">
+			</argument>
+			<argument index="2" name="validate_with_format" type="int" default="-1">
+			</argument>
+			<argument index="3" name="view_count" type="int" default="1">
+			</argument>
+			<description>
+			</description>
+		</method>
 		<method name="framebuffer_format_create">
 			<return type="int">
 			</return>
 			<argument index="0" name="attachments" type="RDAttachmentFormat[]">
 			</argument>
+			<argument index="1" name="view_count" type="int" default="1">
+			</argument>
 			<description>
 			</description>
 		</method>
@@ -379,11 +411,25 @@
 			<description>
 			</description>
 		</method>
+		<method name="framebuffer_format_create_multipass">
+			<return type="int">
+			</return>
+			<argument index="0" name="attachments" type="RDAttachmentFormat[]">
+			</argument>
+			<argument index="1" name="passes" type="RDFramebufferPass[]">
+			</argument>
+			<argument index="2" name="view_count" type="int" default="1">
+			</argument>
+			<description>
+			</description>
+		</method>
 		<method name="framebuffer_format_get_texture_samples">
 			<return type="int" enum="RenderingDevice.TextureSamples">
 			</return>
 			<argument index="0" name="format" type="int">
 			</argument>
+			<argument index="1" name="render_pass" type="int" default="0">
+			</argument>
 			<description>
 			</description>
 		</method>
@@ -524,6 +570,8 @@
 			</argument>
 			<argument index="8" name="dynamic_state_flags" type="int" default="0">
 			</argument>
+			<argument index="9" name="for_render_pass" type="int" default="0">
+			</argument>
 			<description>
 			</description>
 		</method>