protected void CreateBuffersIfNeeded()
{
if (resizeProcessor == null)
{
resizeProcessor = new PreviewProcessor();
}
if (renderBuff == null)
{
renderBuff = new GLRenderBuffer();
renderBuff.Bind();
renderBuff.SetBufferStorageAsDepth(4096, 4096);
GLRenderBuffer.Unbind();
}
if (colorBuff == null)
{
//colorbuff part of the framebuffer is always Rgba32f to support all texture formats
//that could be rendered into it
colorBuff = new GLTextuer2D(PixelInternalFormat.Rgba32f);
colorBuff.Bind();
colorBuff.SetData(IntPtr.Zero, PixelFormat.Rgba, 4096, 4096);
colorBuff.Nearest();
colorBuff.Repeat();
GLTextuer2D.Unbind();
}
if (frameBuff == null)
{
frameBuff = new GLFrameBuffer();
frameBuff.Bind();
frameBuff.AttachColor(colorBuff);
frameBuff.AttachDepth(renderBuff);
IGL.Primary.DrawBuffers(new int[] { (int)DrawBufferMode.ColorAttachment0 });
IGL.Primary.ReadBuffer((int)ReadBufferMode.ColorAttachment0);
if (!frameBuff.IsValid)
{
var status = IGL.Primary.CheckFramebufferStatus((int)FramebufferTarget.Framebuffer);
GLFrameBuffer.Unbind();
return;
}
GLFrameBuffer.Unbind();
}
}
public void Process(int width, int height, GLTextuer2D tex, GLTextuer2D source, GLTextuer2D output)
{
base.Process(width, height, tex, output);
if (Shader != null && PreShader != null)
{
GLTextuer2D temp = new GLTextuer2D(output.InternalFormat);
temp.Bind();
temp.SetData(IntPtr.Zero, PixelFormat.Rgba, width, height);
temp.Linear();
temp.Repeat();
GLTextuer2D.Unbind();
GLTextuer2D temp2 = new GLTextuer2D(output.InternalFormat);
temp2.Bind();
temp2.SetData(IntPtr.Zero, PixelFormat.Rgba, width, height);
temp2.Linear();
temp2.Repeat();
GLTextuer2D.Unbind();
GLTextuer2D temp3 = new GLTextuer2D(PixelInternalFormat.Rgba32f);
temp3.Bind();
temp3.SetData(IntPtr.Zero, PixelFormat.Rgba, width + 1, height + 1);
temp3.Nearest();
temp3.ClampToEdge();
GLTextuer2D.Unbind();
ResizeViewTo(tex, temp, tex.Width, tex.Height, width, height);
IGL.Primary.Clear((int)(ClearBufferMask.ColorBufferBit | ClearBufferMask.DepthBufferBit));
if (source != null)
{
ResizeViewTo(source, temp2, source.Width, source.Height, width, height);
}
IGL.Primary.Clear((int)(ClearBufferMask.ColorBufferBit | ClearBufferMask.DepthBufferBit));
tex = temp;
PreShader.Use();
output.Bind();
output.BindAsImage(0, true, true);
tex.Bind();
tex.BindAsImage(1, true, true);
temp2.Bind();
temp2.BindAsImage(2, true, true);
temp3.Bind();
temp3.BindAsImage(3, true, true);
PreShader.SetUniform("width", (float)width);
PreShader.SetUniform("height", (float)height);
PreShader.SetUniform("sourceOnly", SourceOnly);
PreShader.SetUniform("maxDistance", Distance);
//stage 1 convert temp input range
//into proper format
//for dt
PreShader.SetUniform("stage", (int)0);
IGL.Primary.DispatchCompute(width / 8, height / 8, 1);
Shader.Use();
output.Bind();
output.BindAsImage(0, true, true);
tex.Bind();
tex.BindAsImage(1, true, true);
temp2.Bind();
temp2.BindAsImage(2, true, true);
temp3.Bind();
temp3.BindAsImage(3, true, true);
Shader.SetUniform("width", (float)width);
Shader.SetUniform("height", (float)height);
Shader.SetUniform("sourceOnly", SourceOnly);
Shader.SetUniform("maxDistance", Distance);
//stage 2 run column transform
Shader.SetUniform("stage", (int)0);
IGL.Primary.DispatchCompute(width / 8, 1, 1);
//stage 3 run row transform
Shader.SetUniform("stage", (int)1);
IGL.Primary.DispatchCompute(height / 8, 1, 1);
PreShader.Use();
output.Bind();
output.BindAsImage(0, true, true);
tex.Bind();
tex.BindAsImage(1, true, true);
temp2.Bind();
temp2.BindAsImage(2, true, true);
temp3.Bind();
temp3.BindAsImage(3, true, true);
PreShader.SetUniform("width", (float)width);
PreShader.SetUniform("height", (float)height);
PreShader.SetUniform("sourceOnly", SourceOnly);
PreShader.SetUniform("maxDistance", Distance);
//stage 4 finalize with sqrt() etc
PreShader.SetUniform("stage", (int)1);
IGL.Primary.DispatchCompute(width / 8, height / 8, 1);
GLTextuer2D.UnbindAsImage(0);
GLTextuer2D.UnbindAsImage(1);
GLTextuer2D.UnbindAsImage(2);
GLTextuer2D.UnbindAsImage(3);
GLTextuer2D.Unbind();
temp.Release();
temp2.Release();
temp3.Release();
}
}