/// <summary>
/// Draws a Texture.
/// </summary>
/// <param name="texture">The Texture.</param>
/// <param name="rectangle">The Rectangle.</param>
/// <param name="opacity">The Opacity.</param>
/// <param name="color">The Color.</param>
public void DrawTexture(ITexture texture, Rectangle rectangle, Color color, float opacity = 1)
{
var tex = texture as OpenGLTexture;
if (tex == null)
{
throw new ArgumentException("Expected OpenGLTexture as resource.");
}
OpenGLColor col = OpenGLHelper.ConvertColor(color);
var vertices = new[]
{
// Position Color Texcoords
rectangle.X, rectangle.Y, col.R, col.G, col.B, 0.0f, 0.0f, // Top-left
rectangle.X + rectangle.Width, rectangle.Y, col.R, col.G, col.B, 1.0f, 0.0f, // Top-right
rectangle.X + rectangle.Width, rectangle.Y + tex.Height, col.R, col.G, col.B, 1.0f, 1.0f,
// Bottom-right
rectangle.X, rectangle.Y + rectangle.Height, col.R, col.G, col.B, 0.0f, 1.0f // Bottom-left
};
_sourceVbo.SetData(vertices);
tex.Bind();
_colorShader.SetUniform("dim", _graphicsDevice.BackBuffer.Width, _graphicsDevice.BackBuffer.Height, opacity);
_colorShader.SetUniformMatrix("transform", _matrix4);
uint posAttrib = _colorShader.GetAttribLocation("position");
VertexBuffer.EnableVertexAttribArray(posAttrib);
VertexBuffer.VertexAttribPointer(posAttrib, 2, false, 7 * sizeof(float), 0);
uint colAttrib = _colorShader.GetAttribLocation("color");
VertexBuffer.EnableVertexAttribArray(colAttrib);
VertexBuffer.VertexAttribPointer(colAttrib, 3, false, 7 * sizeof(float), 2 * sizeof(float));
uint texAttrib = _colorShader.GetAttribLocation("texcoord");
VertexBuffer.EnableVertexAttribArray(texAttrib);
VertexBuffer.VertexAttribPointer(texAttrib, 2, false, 7 * sizeof(float), 5 * sizeof(float));
OpenGLInterops.DrawElements(OpenGLInterops.GL_TRIANGLES, 6, OpenGLInterops.GL_UNSIGNED_SHORT, IntPtr.Zero);
tex.Unbind();
}
/// <summary>
/// Initializes the renderer.
/// </summary>
public void Initialize()
{
_renderContext.Initialize();
_colorShader = new ShaderProgram();
var vshader = new VertexShader();
vshader.Compile(SimpleVertexShader.SourceCode);
var fshader = new FragmentShader();
fshader.Compile(SimpleFragmentShader.SourceCode);
_colorShader.Link(vshader, fshader);
OpenGLInterops.Enable(OpenGLInterops.GL_BLEND);
OpenGLInterops.AlphaBlend();
SetTransform(Matrix2x3.Identity);
OpenGLColor clearColor = OpenGLHelper.ConvertColor(_graphicsDevice.ClearColor);
OpenGLInterops.ClearColor(clearColor);
_windowSize = _window.Size;
OpenGLInterops.Viewport(0, 0, (int)_windowSize.X, (int)_windowSize.Y);
_sourceVao = new VertexArray();
_sourceVao.Bind();
_colorShader.Bind();
_sourceEbo = new IndexBuffer();
var elements = new ushort[]
{
0, 1, 2,
2, 3, 0
};
_sourceEbo.Bind();
_sourceEbo.SetData(elements);
_sourceVbo = new VertexBuffer();
_sourceVbo.Bind();
_graphicsDevice.ClearColorChanged += GraphicsDeviceClearColorChanged;
_window.ScreenSizeChanged += WindowScreenSizeChanged;
}
/// <summary>
/// Triggered if the clear color changed.
/// </summary>
private void GraphicsDeviceClearColorChanged(object sender, EventArgs e)
{
OpenGLColor clearColor = OpenGLHelper.ConvertColor(_graphicsDevice.ClearColor);
OpenGLInterops.ClearColor(clearColor);
}
/// <summary>
/// Sets the clear color.
/// </summary>
/// <param name="color">The Color.</param>
public static void ClearColor(OpenGLColor color)
{
glClearColor(color.R, color.G, color.B, color.A);
}
