move shadows to a fullscreen buffer

1 files changed, 48 insertions, 1 deletions

diff --git a/lighting.cpp b/lighting.cpp
index 0e41ddd..4f1fdfb 100644
--- a/lighting.cpp
+++ b/lighting.cpp
@@ -20,7 +20,7 @@ struct GPU_Caster {
 	m4f projection;
 };
 
-void Lighting::init(Device* dev) {
+void Lighting::init(Device* dev, int w, int h) {
 	int i;
 	Sampler_State ss{};
 	lights.init(
@@ -46,6 +46,9 @@ void Lighting::init(Device* dev) {
 		max_shadows,
 		0
 	);
+	zero(ss_shadows, sizeof ss_shadows);
+	zero(ss_shadow_slices, sizeof ss_shadow_slices);
+	recreate(dev, w, h);
 	for (i = 0; i < max_shadows; i++) {
 		cameras[i] = 0;
 		shadow_slices[i] = dev->alias_texture(
@@ -85,6 +88,50 @@ void Lighting::destroy(Device* dev, Renderer& r) {
 		r.destroy_camera(cameras[i]);
 	}
 	dev->destroy_texture(shadows);
+	destroy_ss(dev);
+}
+
+void Lighting::destroy_ss(Device* dev) {
+	int i, j;
+	for (i = 0; i < 2; i++) {
+		for (j = 0; j < max_shadows; j++)
+			if (ss_shadow_slices[i][j])
+				dev->destroy_texture(ss_shadow_slices[i][j]);
+		if (ss_shadows[i])
+			dev->destroy_texture(ss_shadows[i]);
+	}
+}
+
+void Lighting::recreate(Device* dev, int w, int h) {
+	int i, j;
+	destroy_ss(dev);
+	for (i = 0; i < 2; i++) {
+		ss_shadows[i] = dev->create_texture(
+			"Shadow accumulation buffer",
+			texture_format_r8i,
+			Texture_Flags::sampleable | Texture_Flags::colour_target,
+			w,
+			h,
+			1,
+			1,
+			max_shadows,
+			0
+		);
+		for (j = 0; j < max_shadows; j++)
+			ss_shadow_slices[i][j] = dev->alias_texture(
+				ss_shadows[i],
+				"Shadow accumulation buffer slice",
+				texture_format_r8i,
+				Texture_Flags::colour_target,
+				shadow_res,
+				shadow_res,
+				1,
+				1,
+				1,
+				0,
+				j
+			);
+	}
 }
 
 void Lighting::write_bufs(