1 files changed, 119 insertions, 0 deletions
diff --git a/debugdraw.cpp b/debugdraw.cpp
new file mode 100644
index 0000000..43527ab
--- /dev/null
+++ b/debugdraw.cpp
@@ -0,0 +1,119 @@
+#include "asset.hpp"
+#include "camera.hpp"
+#include "debugdraw.hpp"
+#include "video.hpp"
+extern "C" {
+#include "plat.h"
+}
+
+void Line_Renderer::init(Device* dev, Asset_Arena* assets) {
+	vb.init(
+		dev,
+		"Line Renderer mesh",
+		max_lines * sizeof(Vertex) * 2,
+		Buffer_Flags::vertex_buffer
+	);
+	cb.init(
+		dev,
+		"Line Renderer cbuffer",
+		sizeof(CBuffer),
+		Buffer_Flags::constant_buffer
+	);
+	shader = (Shader*)assets->load("debug.csh");
+	vert_binding = shader->binding_index("verts");
+	cbuffer_binding = shader->descriptor_binding("cbuf");
+	assert(vert_binding >= 0);
+	assert(cbuffer_binding >= 0);
+	verts = (Vertex*)vb.map(dev);
+	cur = 0;
+}
+
+void Line_Renderer::destroy(Device* dev) {
+	vb.unmap(dev);
+	vb.destroy(dev);
+	cb.destroy(dev);
+}
+
+void Line_Renderer::begin(int wi, int he) {
+	cur = 0;
+	w = wi;
+	h = he;
+	cur_col = v3f(1.0f, 1.0f, 1.0f);
+}
+
+void Line_Renderer::colour(const v3f& c) {
+	cur_col = c;
+}
+
+void Line_Renderer::add_line(const v3f& s, const v3f& e) {
+	if (cur >= max_lines) {
+		assert(0);
+		return;
+	}
+	Vertex& a = verts[cur * 2];
+	Vertex& b = verts[cur * 2 + 1];
+	a.x = s.x;
+	a.y = s.y;
+	a.z = s.z;
+	b.x = e.x;
+	b.y = e.y;
+	b.z = e.z;
+	a.r = cur_col.x;
+	a.g = cur_col.y;
+	a.b = cur_col.z;
+	b.r = cur_col.x;
+	b.g = cur_col.y;
+	b.b = cur_col.z;
+	cur++;
+}
+
+void Line_Renderer::add_box(const AABB& b) {
+	add_line(v3f(b.max.x, b.max.y, b.max.z), v3f(b.max.x, b.max.y, b.min.z));
+	add_line(v3f(b.max.x, b.max.y, b.max.z), v3f(b.max.x, b.min.y, b.max.z));
+	add_line(v3f(b.max.x, b.max.y, b.max.z), v3f(b.min.x, b.max.y, b.max.z));
+	add_line(v3f(b.max.x, b.min.y, b.min.z), v3f(b.max.x, b.max.y, b.min.z));
+	add_line(v3f(b.max.x, b.min.y, b.min.z), v3f(b.max.x, b.min.y, b.max.z));
+	add_line(v3f(b.min.x, b.max.y, b.max.z), v3f(b.min.x, b.min.y, b.max.z));
+	add_line(v3f(b.min.x, b.max.y, b.min.z), v3f(b.max.x, b.max.y, b.min.z));
+	add_line(v3f(b.min.x, b.max.y, b.min.z), v3f(b.min.x, b.max.y, b.max.z));
+	add_line(v3f(b.min.x, b.min.y, b.max.z), v3f(b.max.x, b.min.y, b.max.z));
+	add_line(v3f(b.min.x, b.min.y, b.min.z), v3f(b.max.x, b.min.y, b.min.z));
+	add_line(v3f(b.min.x, b.min.y, b.min.z), v3f(b.min.x, b.max.y, b.min.z));
+	add_line(v3f(b.min.x, b.min.y, b.min.z), v3f(b.min.x, b.min.y, b.max.z));
+}
+
+void Line_Renderer::flush(
+	const Camera& cam,
+	Device* dev,
+	Arena* a,
+	Render_Pass& rp
+) {
+	if (!cur) return;
+	CBuffer* c = (CBuffer*)cb.map(dev);
+	c->vp = cam.get_proj() * cam.get_view();
+	cb.unmap(dev);
+	Pipeline_Builder pb(a, dev);
+	Context& ctx = dev->get_ctx();
+	cb.update(ctx);
+	vb.update(ctx);
+	pb.begin();
+	pb.shader(shader->id);
+	pb.cbuffer(cbuffer_binding, cb.gpuonly);
+	pb.vertex_format(shader->vf);
+	pb.geo(Geo_Type::lines);
+	if (rp.depth.id)
+		pb.depth(true, false, Depth_Mode::less);
+	Pipeline& pip = pb.build();
+	Vertex_Buffer_Binding binding[] = {{
+		.id = vb.gpuonly,
+		.offset = 0,
+		.target = vert_binding
+	}, {}};
+	Draw d{};
+	d.verts = binding;
+	d.vertex_count = cur * 2;
+	d.instance_count = 1;
+	ctx.submit(d, pip, rp);
+	cur = 0;
+}
+