add depth prepass

2 files changed, 16 insertions, 1 deletions

diff --git a/c2.cpp b/c2.cpp
index d3b414b..b11b769 100644
--- a/c2.cpp
+++ b/c2.cpp
@@ -189,6 +189,10 @@ extern "C" int entrypoint() {
 		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);
 		Render_Pass& pass2 = pb.build_rp();
@@ -212,6 +216,13 @@ extern "C" int entrypoint() {
 		monkey->render(
 			dev,
 			&frame_arena,
+			depth_prepass,
+			transform,
+			projection
+		);
+		monkey->render(
+			dev,
+			&frame_arena,
 			pass2,
 			transform,
 			projection
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,