/// <summary>
/// Draws the actual diffusion to the buffer, and overlays a full screen texture on the viewport.
/// </summary>
public int DrawDiffusion()
{
if (buffers.ListPathPoints.Count == 0)
{
return(-1);
}
GL.Ext.BindFramebuffer(FramebufferTarget.FramebufferExt, FBOHandle);
GL.Ext.FramebufferTexture2D(FramebufferTarget.FramebufferExt, FramebufferAttachment.ColorAttachment0Ext, TextureTarget.Texture2D, colorTexturePing, 0);
GL.Ext.FramebufferTexture2D(FramebufferTarget.FramebufferExt, FramebufferAttachment.DepthAttachmentExt, TextureTarget.Texture2D, depthTexture, 0);
CheckFrameBufferStatus();
GL.Clear(ClearBufferMask.ColorBufferBit | ClearBufferMask.DepthBufferBit);
DrawBezierCurves();
DrawEndPoints();
GL.Ext.FramebufferTexture2D(FramebufferTarget.FramebufferExt, FramebufferAttachment.DepthAttachmentExt, TextureTarget.Texture2D, 0, 0);
int currentColorTexture = colorTexturePing;
int currentColorBuffer = colorTexturePong;
GL.UseProgram(diffuseShader.ShaderProgramHandle);
diffuseShader.EnableAttributes();
diffuseShader.BindTexture(ref depthTexture, TextureUnit.Texture1, "depth_texture");
int width = renderState.ViewSize.Width;
int height = renderState.ViewSize.Height;
float scale = (float)Math.Sqrt(width * width + height * height);
GL.Uniform1(GL.GetUniformLocation(diffuseShader.ShaderProgramHandle, "xScale"), (scale - 1f) / width);
GL.Uniform1(GL.GetUniformLocation(diffuseShader.ShaderProgramHandle, "yScale"), (scale - 1f) / height);
for (int i = 0; i < iterations; i++)
{
GL.Ext.FramebufferTexture2D(FramebufferTarget.FramebufferExt, FramebufferAttachment.ColorAttachment0Ext, TextureTarget.Texture2D, currentColorBuffer, 0);
CheckFrameBufferStatus();
GL.ClearColor(Color.Black);
GL.Clear(ClearBufferMask.ColorBufferBit | ClearBufferMask.DepthBufferBit);
GL.Uniform1(GL.GetUniformLocation(diffuseShader.ShaderProgramHandle, "iteration"), i + 1);
diffuseShader.BindTexture(ref currentColorTexture, TextureUnit.Texture0, "color_texture");
DrawTexturedQuad(-1, 1, 1, -1, diffuseShader);
int tempColorTexture = currentColorTexture;
currentColorTexture = currentColorBuffer;
currentColorBuffer = tempColorTexture;
}
diffuseShader.DisableAttributes();
GL.Ext.BindFramebuffer(FramebufferTarget.FramebufferExt, 0);
return(currentColorTexture);
}
/// <summary>
/// The main draw call to draw the current frame
/// </summary>
public void Draw()
{
GL.ClearColor(Color.Gray);
GL.Clear(ClearBufferMask.ColorBufferBit | ClearBufferMask.DepthBufferBit);
GL.MatrixMode(MatrixMode.Modelview);
GL.LoadIdentity();
GL.Disable(EnableCap.DepthTest);
DrawBackground();
DrawImage();
if (drawDiffusion)
{
GL.Enable(EnableCap.DepthTest);
int tex = DrawDiffusion();
if (GL.IsTexture(tex))
{
GL.UseProgram(imageShader.ShaderProgramHandle);
imageShader.SetProjectionMatrix(Matrix4.Identity);
imageShader.EnableAttributes();
imageShader.BindTexture(ref tex, TextureUnit.Texture0, "background");
DrawTexturedQuad(-1, 1, 1, -1, imageShader);
imageShader.DisableAttributes();
imageShader.SetProjectionMatrix(renderState.ProjectionMatrix);
}
GL.Disable(EnableCap.DepthTest);
}
DrawBezierLines();
DrawControlLines();
DrawPoints();
GL.Enable(EnableCap.DepthTest);
if (GL.GetError() != ErrorCode.NoError)
{
Debug.WriteLine(GL.GetError().ToString());
}
}