From 86810460eed75c19beb9f524e75c193edfa9ddfd Mon Sep 17 00:00:00 2001
From: quou <quou@disroot.org>
Date: Sat, 28 Dec 2024 18:21:11 +1100
Subject: index buffers

---
 video.cpp | 34 +++++++++++++++++++++++++++-------
 video.hpp |  7 +++++++
 2 files changed, 34 insertions(+), 7 deletions(-)

diff --git a/video.cpp b/video.cpp
index 3dc1e61..7bb420d 100644
--- a/video.cpp
+++ b/video.cpp
@@ -1829,13 +1829,33 @@ void Context::submit(
 		VkDeviceSize offset = (VkDeviceSize)binding->offset;
 		vkCmdBindVertexBuffers(ctx->cb, 0, 1, &buf, &offset);
 	}
-	vkCmdDraw(
-		ctx->cb,
-		draw.vertex_count,
-		draw.instance_count,
-		draw.first_vertex,
-		draw.first_instance
-	);
+	if (draw.inds.id) {
+		const Index_Buffer_Binding& inds = draw.inds;
+		VkBuffer buf = ((Buffer_Vk*)&dev->get_buffer(inds.id))->buf;
+		VkDeviceSize offset = (VkDeviceSize)inds.offset;
+		vkCmdBindIndexBuffer(
+			ctx->cb,
+			buf,
+			offset,
+			VK_INDEX_TYPE_UINT16
+		);
+		vkCmdDrawIndexed(
+			ctx->cb,
+			draw.vertex_count,
+			draw.instance_count,
+			draw.first_vertex,
+			draw.vertex_offset,
+			draw.first_instance
+		);
+	} else {
+		vkCmdDraw(
+			ctx->cb,
+			draw.vertex_count,
+			draw.instance_count,
+			draw.first_vertex,
+			draw.first_instance
+		);
+	}
 	ctx->end_rp(rpo);
 	pso.on_submit();
 	if (dso)
diff --git a/video.hpp b/video.hpp
index 453423b..d524d81 100644
--- a/video.hpp
+++ b/video.hpp
@@ -169,12 +169,19 @@ struct Vertex_Buffer_Binding {
 	int target;
 };
 
+struct Index_Buffer_Binding {
+	Buffer_Id id;
+	size_t offset;
+};
+
 struct Draw {
 	Vertex_Buffer_Binding* verts;
+	Index_Buffer_Binding inds;
 	int vertex_count;
 	int instance_count;
 	int first_vertex;
 	int first_instance;
+	int vertex_offset;
 };
 
 struct Device;
-- 
cgit v1.2.3-54-g00ecf