From 96c459ca2f52cf2c5bec269d0f30e01d21bc916b Mon Sep 17 00:00:00 2001
From: quou <quou@disroot.org>
Date: Sun, 29 Dec 2024 14:49:07 +1100
Subject: add depth prepass

---
 c2.cpp    | 11 +++++++++++
 model.cpp |  6 +++++-
 2 files changed, 16 insertions(+), 1 deletion(-)

diff --git a/c2.cpp b/c2.cpp
index d3b414b..b11b769 100644
--- a/c2.cpp
+++ b/c2.cpp
@@ -188,6 +188,10 @@ extern "C" int entrypoint() {
 		pb.rp_depth_target(dev->get_depth_target(), 1.0f);
 		dev->get_ctx().submit(pb.build_rp());
 
+		pb.begin_rp();
+		pb.rp_depth_target(dev->get_depth_target(), Clear_Mode::restore);
+		Render_Pass& depth_prepass = pb.build_rp();
+
 		pb.begin_rp();
 		pb.rp_target(dev->get_backbuffer(), Clear_Mode::restore);
 		pb.rp_depth_target(dev->get_depth_target(), Clear_Mode::restore);
@@ -209,6 +213,13 @@ extern "C" int entrypoint() {
 			raxis
 		));
 		monkey->update_transforms();
+		monkey->render(
+			dev,
+			&frame_arena,
+			depth_prepass,
+			transform,
+			projection
+		);
 		monkey->render(
 			dev,
 			&frame_arena,
diff --git a/model.cpp b/model.cpp
index e8be727..c3d01ac 100644
--- a/model.cpp
+++ b/model.cpp
@@ -165,6 +165,7 @@ void Model::render(
 		cbuffers[i].view_projection = view_projection;
 		cbuffers[i].model = transform * meshes[i].world;
 	}
+	bool depth_only = !pass.colour_count;
 	dev->unmap_buffer(mvp);
 	for (i = 0; i < c; i++) {
 		Mesh& mesh = meshes[i];
@@ -187,7 +188,10 @@ void Model::render(
 		draw.first_vertex = mesh.offset;
 		draw.vertex_offset = mesh.vbo_offset;
 		pb.begin();
-		pb.depth(true, true, Depth_Mode::less);
+		if (depth_only)
+			pb.depth(true, true, Depth_Mode::less);
+		else
+			pb.depth(true, false, Depth_Mode::equal);
 		pb.shader(mesh.shader);
 		pb.cbuffer(
 			mesh.mvp_binding,
-- 
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