Added draw package as renderer focused on mixed use layout / 2D / 3D scene applications (#7)

Co-authored-by: Zachary Levy <zachary@sunforge.is>
Reviewed-on: #7

draw/examples/main.odin

@@ -0,0 +1,74 @@
+package examples
+
+import "core:fmt"
+import "core:mem"
+import "core:os"
+
+main :: proc() {
+	//----- Tracking allocator ----------------------------------
+	{
+		tracking_temp_allocator := false
+		// Temp
+		track_temp: mem.Tracking_Allocator
+		if tracking_temp_allocator {
+			mem.tracking_allocator_init(&track_temp, context.temp_allocator)
+			context.temp_allocator = mem.tracking_allocator(&track_temp)
+		}
+		// Default
+		track: mem.Tracking_Allocator
+		mem.tracking_allocator_init(&track, context.allocator)
+		context.allocator = mem.tracking_allocator(&track)
+		// Log a warning about any memory that was not freed by the end of the program.
+		// This could be fine for some global state or it could be a memory leak.
+		defer {
+			// Temp allocator
+			if tracking_temp_allocator {
+				if len(track_temp.allocation_map) > 0 {
+					fmt.eprintf("=== %v allocations not freed - temp allocator: ===\n", len(track_temp.allocation_map))
+					for _, entry in track_temp.allocation_map {
+						fmt.eprintf("- %v bytes @ %v\n", entry.size, entry.location)
+					}
+				}
+				if len(track_temp.bad_free_array) > 0 {
+					fmt.eprintf("=== %v incorrect frees - temp allocator: ===\n", len(track_temp.bad_free_array))
+					for entry in track_temp.bad_free_array {
+						fmt.eprintf("- %p @ %v\n", entry.memory, entry.location)
+					}
+				}
+				mem.tracking_allocator_destroy(&track_temp)
+			}
+			// Default allocator
+			if len(track.allocation_map) > 0 {
+				fmt.eprintf("=== %v allocations not freed - main allocator: ===\n", len(track.allocation_map))
+				for _, entry in track.allocation_map {
+					fmt.eprintf("- %v bytes @ %v\n", entry.size, entry.location)
+				}
+			}
+			if len(track.bad_free_array) > 0 {
+				fmt.eprintf("=== %v incorrect frees - main allocator: ===\n", len(track.bad_free_array))
+				for entry in track.bad_free_array {
+					fmt.eprintf("- %p @ %v\n", entry.memory, entry.location)
+				}
+			}
+			mem.tracking_allocator_destroy(&track)
+		}
+	}
+
+	args := os.args
+	if len(args) < 2 {
+		fmt.eprintln("Usage: examples <example_name>")
+		fmt.eprintln("Available examples: hellope-shapes, hellope-text, hellope-clay, hellope-custom")
+		os.exit(1)
+	}
+
+	switch args[1] {
+	case "hellope-clay": hellope_clay()
+	case "hellope-custom": hellope_custom()
+	case "hellope-shapes": hellope_shapes()
+	case "hellope-text": hellope_text()
+	case:
+		fmt.eprintf("Unknown example: %v\n", args[1])
+		fmt.eprintln("Available examples: hellope-shapes, hellope-text, hellope-clay, hellope-custom")
+		os.exit(1)
+	}
+}