basic text rendering

1 files changed, 60 insertions, 0 deletions

diff --git a/ui.hpp b/ui.hpp
new file mode 100644
index 0000000..a181afe
--- /dev/null
+++ b/ui.hpp
@@ -0,0 +1,60 @@
+#ifndef ui_hpp
+#define ui_hpp
+
+#include "video.hpp"
+
+struct Arena;
+struct UI {
+	struct Rect {
+		int x, y, w, h;
+	};
+
+	struct Element : Rect {
+		enum class Type {
+			label
+		} type;
+		Element* next;
+		static int size(Type t);
+	};
+
+	struct Label : Element {
+		char* text;
+		int len;
+		int x, y;
+	};
+
+	struct Vertex {
+		float x, y, u, v, r, g, b, a;
+	};
+
+	Arena* arena;
+	Device* device;
+	Element* tree;
+	Texture_Id atlas;
+	Shader_Id shader;
+	Vertex_Format_Id vertex_format;
+	Buffer_Id mesh;
+	Sampler_Id sampler;
+	struct {
+		int vert_binding;
+		int atlas_binding;
+	} shader_info;
+	float ndc[2];
+
+	static int text_width(const char* t);
+	static int text_height(const char* t);
+
+	static UI* create(Device* dev, Arena* a, Shader_Id sh);
+
+	Element* create_element(Element::Type t);
+	Label* create_label(const char* t, int x, int y);
+
+	void init(Device* dev, Arena* a, Texture_Id atlas, Shader_Id sh);
+	void destroy();
+	void update(Arena* s);
+	void render(Arena* s, Texture_Id target);
+
+	int render_label(const Label* l, int off);
+};
+
+#endif