add texture

pixelgl/texture.go

@@ -0,0 +1,49 @@
+package pixelgl
+
+import "github.com/go-gl/gl/v3.3-core/gl"
+
+// Texture is an OpenGL texture.
+type Texture struct {
+	parent BeginEnder
+	tex    uint32
+}
+
+// NewTexture creates a new texture with the specified width and height.
+// The pixels must be a sequence of RGBA values.
+func NewTexture(parent BeginEnder, width, height int, pixels []uint8) *Texture {
+	texture := &Texture{parent: parent}
+	Do(func() {
+		gl.GenTextures(1, &texture.tex)
+		gl.BindTexture(gl.TEXTURE_2D, texture.tex)
+		gl.TexImage2D(
+			gl.TEXTURE_2D,
+			0,
+			gl.RGBA,
+			int32(width),
+			int32(height),
+			0,
+			gl.RGBA,
+			gl.UNSIGNED_BYTE,
+			gl.Ptr(pixels),
+		)
+		gl.GenerateMipmap(gl.TEXTURE_2D)
+		gl.BindTexture(gl.TEXTURE_2D, 0)
+	})
+	return texture
+}
+
+// Begin binds a texture.
+func (t *Texture) Begin() {
+	t.parent.Begin()
+	Do(func() {
+		gl.BindTexture(gl.TEXTURE_2D, t.tex)
+	})
+}
+
+// End unbinds a texture.
+func (t *Texture) End() {
+	Do(func() {
+		gl.BindTexture(gl.TEXTURE_2D, 0)
+	})
+	t.parent.End()
+}