add basic stubs for platform and window

graphics/window.go

@@ -0,0 +1,34 @@
+package graphics
+
+import "github.com/veandco/go-sdl2/sdl"
+
+type Window struct {
+	window   *sdl.Window
+	renderer *sdl.Renderer
+}
+
+func NewWindow(title string, width, height int) (*Window, error) {
+	window, err := sdl.CreateWindow(
+		title,
+		sdl.WINDOWPOS_UNDEFINED,
+		sdl.WINDOWPOS_UNDEFINED,
+		int32(width),
+		int32(height),
+		sdl.WINDOW_SHOWN,
+	)
+	if err != nil {
+		return nil, err
+	}
+
+	renderer, err := sdl.CreateRenderer(window, -1, sdl.RENDERER_ACCELERATED)
+	if err != nil {
+		window.Destroy()
+		return nil, err
+	}
+
+	return &Window{window, renderer}, nil
+}
+
+func (w *Window) Destroy() {
+
+}

platform/platform.go

@@ -0,0 +1,53 @@
+package platform
+
+import (
+	"github.com/go-gl/gl/v2.1/gl"
+	"github.com/veandco/go-sdl2/sdl"
+)
+
+type Platform interface {
+	CreateWindow(title string, width, height int) (Window, error)
+	Destroy() error
+}
+
+var globalPlatformInit bool
+
+type platform struct {
+	windows []Window
+}
+
+func New() (*Platform, error) {
+	if !globalPlatformInit {
+		if err := sdl.Init(sdl.INIT_VIDEO); err != nil {
+			return nil, err
+		}
+
+		if err := gl.Init(); err != nil {
+			return nil, err
+		}
+
+		globalPlatformInit = true
+	}
+
+	return nil, nil
+}
+
+func (p *platform) CreateWindow(title string, width, height int) (Window, error) {
+	window, err := newWindow(title, width, height)
+	if err != nil {
+		return nil, err
+	}
+
+	return window, err
+}
+
+func (p *platform) Destroy() error {
+	for _, w := range p.windows {
+		if err := w.Destroy(); err != nil {
+			return err
+		}
+	}
+
+	p.windows = nil
+	return nil
+}

platform/window.go

@@ -0,0 +1,47 @@
+package platform
+
+import "github.com/veandco/go-sdl2/sdl"
+
+type Window interface {
+	Destroy() error
+}
+
+type window struct {
+	sdlWindow    *sdl.Window
+	sdlGlContext sdl.GLContext
+}
+
+func newWindow(title string, width, height int) (Window, error) {
+	sdlWindow, err := sdl.CreateWindow(
+		title,
+		sdl.WINDOWPOS_CENTERED,
+		sdl.WINDOWPOS_CENTERED,
+		int32(width),
+		int32(height),
+		sdl.WINDOW_OPENGL,
+	)
+	if err != nil {
+		return nil, err
+	}
+
+	sdlGlContext, err := sdlWindow.GLCreateContext()
+	if err != nil {
+		sdlWindow.Destroy()
+		return nil, err
+	}
+
+	return &window{sdlWindow, sdlGlContext}, nil
+}
+
+func (w *window) Destroy() error {
+	if w.sdlWindow != nil {
+		if err := w.sdlWindow.Destroy(); err != nil {
+			return err
+		}
+	}
+
+	w.sdlGlContext = nil
+	w.sdlWindow = nil
+
+	return nil
+}