Properly send lights from the CPU

1 files changed, 54 insertions, 0 deletions

diff --git a/lighting.cpp b/lighting.cpp
new file mode 100644
index 0000000..d78ef6e
--- /dev/null
+++ b/lighting.cpp
@@ -0,0 +1,54 @@
+#include "lighting.hpp"
+#include "world.hpp"
+
+extern "C" {
+#include "memory.h"
+#include "plat.h"
+}
+
+/* needs to match surface shader */
+struct GPU_Light {
+	v3f dir;
+	float brightness;
+	v3f colour;
+	float pad;
+};
+
+void Lighting::init(Device* dev) {
+	lights.init(
+		dev,
+		"Light buffer",
+		max_lights * sizeof(GPU_Light),
+		Buffer_Flags::storage_buffer
+	);
+}
+
+void Lighting::destroy(Device* dev) {
+	lights.destroy(dev);
+}
+
+void Lighting::write_buf(void* ptr, World& w) {
+	GPU_Light* dst = (GPU_Light*)ptr;
+	int count = 0;
+	for (auto v : w.view<Sun_Light>()) {
+		GPU_Light gl;
+		Sun_Light& l = v.get<Sun_Light>();
+		if (count >= max_lights) {
+			print_war("Over light limit.\n");
+			return;
+		}
+		gl.brightness = l.brightness;
+		gl.colour = l.colour;
+		gl.dir = l.dir;
+		dst[count++] = gl;
+	}
+	light_count = count;
+}
+
+void Lighting::update(Device* dev, Context& ctx, World& w) {
+	light_count = 0;
+	write_buf(lights.map(dev), w);
+	lights.unmap(dev);
+	lights.update(ctx);
+}
+