Reduce calling glFlush

internal/graphics/internal/shader/drawtexture.go

@@ -86,7 +86,5 @@ func DrawTexture(c *opengl.Context, texture opengl.Texture, projectionMatrix [4]
 	}
 	c.BufferSubData(c.ArrayBuffer, vertices)
 	c.DrawElements(6 * quads.Len())
-
-	c.Flush()
 	return nil
 }

internal/opengl/context.go

@@ -68,6 +68,7 @@ func (c *Context) NewTexture(width, height int, pixels []uint8, filter FilterTyp
 }
 
 func (c *Context) TexturePixels(t Texture, width, height int) ([]uint8, error) {
+	gl.Flush()
 	// TODO: Use glGetTexLevelParameteri and GL_TEXTURE_WIDTH?
 	pixels := make([]uint8, 4*width*height)
 	gl.Texture(t).Bind(gl.TEXTURE_2D)

internal/opengl/context_js.go

@@ -84,6 +84,7 @@ func (c *Context) NewTexture(width, height int, pixels []uint8, filter FilterTyp
 
 func (c *Context) TexturePixels(t Texture, width, height int) ([]uint8, error) {
 	gl := c.gl
+	gl.Flush()
 	// TODO: Use glGetTexLevelParameteri and GL_TEXTURE_WIDTH?
 	pixels := js.Global.Get("Uint8Array").New(4 * width * height)
 	gl.BindTexture(gl.TEXTURE_2D, t)

internal/ui/ui_js.go

@@ -31,7 +31,7 @@ func Use(f func(*opengl.Context)) {
 }
 
 func DoEvents() {
-	time.Sleep(1)
+	time.Sleep(0)
 }
 
 func Terminate() {