1 files changed, 136 insertions, 0 deletions

diff --git a/include/ui.h b/include/ui.h
new file mode 100644
index 0000000..43bb2e7
--- /dev/null
+++ b/include/ui.h
@@ -0,0 +1,136 @@
+#pragma once
+
+#include <stdbool.h>
+#include <stdint.h>
+
+typedef uint8_t uiChannel;
+
+typedef struct uiPixel {
+  uiChannel r, g, b, a;
+} uiPixel;
+
+typedef struct uiSize {
+  int width;
+  int height;
+} uiSize;
+
+/// A UI surface to which widgets are rendered.
+typedef struct uiSurface {
+  int      width;
+  int      height;
+  uiPixel* pixels;
+} uiSurface;
+
+/// Rectangle.
+/// (x,y) is the top-left corner.
+typedef struct uiRect {
+  int x;
+  int y;
+  int width;
+  int height;
+} uiRect;
+
+/// Point.
+typedef struct uiPoint {
+  int x;
+  int y;
+} uiPoint;
+
+/// Widget type.
+typedef enum uiWidgetType {
+  uiTypeButton,
+  uiTypeFrame,
+  uiTypeLabel,
+  uiTypeTable,
+  uiTypeMax,
+} uiWidgetType;
+
+typedef struct uiButton uiButton;
+typedef struct uiFrame  uiFrame;
+typedef struct uiLabel  uiLabel;
+typedef struct uiTable  uiTable;
+typedef struct uiWidget uiWidget;
+
+/// Widget pointer.
+typedef struct uiWidgetPtr {
+  uiWidgetType type;
+  union {
+    uiButton* button;
+    uiFrame*  frame;
+    uiLabel*  label;
+    uiTable*  table;
+    uiWidget* widget;
+  };
+} uiWidgetPtr;
+
+// -----------------------------------------------------------------------------
+// Library.
+
+/// Initialize the UI library.
+/// This should be called once during application startup.
+bool uiInit(void);
+
+/// Shutdown the UI library.
+/// This should be called once during application shutdown.
+void uiShutdown(void);
+
+// -----------------------------------------------------------------------------
+// Widget.
+
+uiWidgetPtr uiMakeButtonPtr(uiButton*);
+uiWidgetPtr uiMakeFramePtr(uiFrame*);
+uiWidgetPtr uiMakeLabelPtr(uiLabel*);
+uiWidgetPtr uiMakeTablePtr(uiTable*);
+
+void uiWidgetSetParent(uiWidgetPtr child, uiWidgetPtr parent);
+
+// -----------------------------------------------------------------------------
+// Button.
+
+/// Create a button.
+uiButton* uiMakeButton(const char* text);
+
+// -----------------------------------------------------------------------------
+// Frame.
+
+/// Create a frame.
+uiFrame* uiMakeFrame(void);
+
+/// Destroy the frame.
+void uiDestroyFrame(uiFrame**);
+
+/// Resize the frame.
+void uiResizeFrame(uiFrame*, int width, int height);
+
+/// Get the frame's dimensions.
+uiSize uiGetFrameSize(const uiFrame*);
+
+// -----------------------------------------------------------------------------
+// Label.
+
+/// Create a label.
+uiLabel* uiMakeLabel(const char* text);
+
+// -----------------------------------------------------------------------------
+// Table.
+
+/// Create a table.
+uiTable* uiMakeTable(int rows, int cols, const char** header);
+
+/// Add a row.
+void uiTableAddRow(uiTable*, const char** row);
+
+/// Set the table's cell.
+void uiTableSet(uiTable*, int row, int col, uiWidgetPtr widget);
+
+/// Get the table's cell.
+const uiWidget* uiTableGet(const uiTable*, int row, int col);
+
+/// Get the table's cell.
+uiWidget* uiTableGetMut(uiTable*, int row, int col);
+
+// -----------------------------------------------------------------------------
+// Rendering.
+
+/// Render the frame.
+void uiRender(const uiFrame*, uiSurface*);