public void TestDrawTransparentTexture()
{
var pixels = new[] { new Pixel(), new Pixel(), new Pixel(), new Pixel() };
_window = new GameWindow {
Width = 200, Height = 200
};
_window.RenderFrame += (caller, args) =>
{
IGL gl = new GLWrapper();
gl.Viewport(0, 0, 200, 200);
gl.ReadBuffer(ReadBufferMode.Front);
gl.Enable(EnableCap.Texture2D);
gl.Enable(EnableCap.Blend);
gl.BlendFunc(BlendingFactorSrc.SrcAlpha, BlendingFactorDest.OneMinusSrcAlpha);
gl.ClearColor(1.0f, 1.0f, 0.0f, 1.0f);
int textureId = GL.GenTexture();
gl.BindTexture(TextureTarget.Texture2D, textureId);
gl.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureMinFilter, (int)TextureMinFilter.Nearest);
gl.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureMagFilter, (int)TextureMagFilter.Nearest);
var bitmap = new Bitmap(@"..\..\Images\testtexture.png");
var data = bitmap.LockBits(new Rectangle(0, 0, bitmap.Width, bitmap.Height),
ImageLockMode.ReadOnly,
System.Drawing.Imaging.PixelFormat.Format32bppArgb);
gl.TexImage2D(TextureTarget.Texture2D, 0, PixelInternalFormat.Rgba, data.Width, data.Height,
0, PixelFormat.Bgra, PixelType.UnsignedByte, data.Scan0);
bitmap.UnlockBits(data);
gl.Clear(ClearBufferMask.ColorBufferBit);
gl.Begin(PrimitiveType.Quads);
{
gl.TexCoord2(0.0f, 0.0f);
gl.Vertex2(-1.0f, -1.0f);
gl.TexCoord2(1.0f, 0.0f);
gl.Vertex2(1.0f, -1.0f);
gl.TexCoord2(1.0f, 1.0f);
gl.Vertex2(1.0f, 1.0f);
gl.TexCoord2(0.0f, 1.0f);
gl.Vertex2(-1.0f, 1.0f);
}
gl.End();
_window.SwapBuffers();
pixels[0].ReadBuffer(99, 99);
pixels[1].ReadBuffer(99, 100);
pixels[2].ReadBuffer(100, 100);
pixels[3].ReadBuffer(100, 99);
_window.Close();
};
_window.Run();
Assert.AreEqual(new Pixel(1.0f, 0.0f, 0.0f), pixels[0]);
Assert.AreEqual(new Pixel(0.0f, 1.0f, 0.0f), pixels[1]);
Assert.AreEqual(new Pixel(0.0f, 0.0f, 1.0f), pixels[2]);
Assert.AreEqual(new Pixel(1.0f, 1.0f, 0.0f), pixels[3]);
}