private float CalculateBackfacePercentage(RGB[] buffer, int width, int height)
{
GL.ReadPixels<RGB>(0, 0, width, height, PixelFormat.Rgb, PixelType.UnsignedByte, buffer);
int r_total = 0;
int b_total = 0;
Parallel.For(0, buffer.Length, () => new RedBlueTuple { R_Total = 0, B_Total = 0 }, (i, loop, partial) =>
{
partial.R_Total += buffer[i].r;
partial.B_Total += buffer[i].b;
return partial;
},
partial =>
{
Interlocked.Add(ref r_total, partial.R_Total);
Interlocked.Add(ref b_total, partial.B_Total);
});
return r_total / (float)(r_total + b_total);
}
private void CreateCubemapBuffers()
{
CubemapFboHandle = new uint[6];
CubemapColorTexture = new uint[6];
CubemapDepthRenderbuffer = new uint[6];
cubemapDirections = new Vector3[6];
cubemapDirections[0] = new Vector3(0.0f, 0.0f, 1.0f);
cubemapDirections[1] = new Vector3(0.0f, 0.0f, -1.0f);
cubemapDirections[2] = new Vector3(0.0f, 1.0f, 0.0f);
cubemapDirections[3] = new Vector3(0.0f, -1.0f, 0.0f);
cubemapDirections[4] = new Vector3(1.0f, 0.0f, 0.0f);
cubemapDirections[5] = new Vector3(-1.0f, 0.0f, 0.0f);
cubemapUps = new Vector3[6];
cubemapUps[0] = Vector3.UnitY;
cubemapUps[1] = Vector3.UnitY;
cubemapUps[2] = Vector3.UnitZ;
cubemapUps[3] = Vector3.UnitZ;
cubemapUps[4] = Vector3.UnitY;
cubemapUps[5] = Vector3.UnitY;
cubemapColorBuffers = new RGB[6][];
for (int i = 0; i < 6; i++)
{
cubemapColorBuffers[i] = new RGB[CubemapWidth * CubemapHeight];
}
cubemapDepthBuffers = new float[6][];
for (int i = 0; i < 6; i++)
{
cubemapDepthBuffers[i] = new float[CubemapWidth * CubemapHeight];
}
cubemapProjections = new Matrix4[6];
// Create Color Texture
GL.GenTextures(6, CubemapColorTexture);
for (int i = 0; i < CubemapColorTexture.Length; i++)
{
GL.BindTexture(TextureTarget.Texture2D, CubemapColorTexture[i]);
GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureMinFilter, (int)TextureMinFilter.Nearest);
GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureMagFilter, (int)TextureMagFilter.Nearest);
GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureWrapS, (int)TextureWrapMode.Clamp);
GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureWrapT, (int)TextureWrapMode.Clamp);
GL.TexImage2D(TextureTarget.Texture2D, 0, PixelInternalFormat.Rgba8, CubemapWidth, CubemapHeight, 0, PixelFormat.Rgba, PixelType.UnsignedByte, IntPtr.Zero);
}
// test for GL Error here (might be unsupported format)
GL.BindTexture(TextureTarget.Texture2D, 0); // prevent feedback, reading and writing to the same image is a bad idea
// Create Depth Renderbuffer
GL.Ext.GenRenderbuffers(6, CubemapDepthRenderbuffer);
for (int i = 0; i < CubemapDepthRenderbuffer.Length; i++)
{
GL.Ext.BindRenderbuffer(RenderbufferTarget.RenderbufferExt, CubemapDepthRenderbuffer[i]);
GL.Ext.RenderbufferStorage(RenderbufferTarget.RenderbufferExt, (RenderbufferStorage)All.DepthComponent32, CubemapWidth, CubemapHeight);
}
// test for GL Error here (might be unsupported format)
// Create a FBO and attach the textures
GL.Ext.GenFramebuffers(6, CubemapFboHandle);
for (int i = 0; i < CubemapFboHandle.Length; i++)
{
GL.Ext.BindFramebuffer(FramebufferTarget.FramebufferExt, CubemapFboHandle[i]);
GL.Ext.FramebufferTexture2D(FramebufferTarget.FramebufferExt, FramebufferAttachment.ColorAttachment0Ext, TextureTarget.Texture2D, CubemapColorTexture[i], 0);
GL.Ext.FramebufferRenderbuffer(FramebufferTarget.FramebufferExt, FramebufferAttachment.DepthAttachmentExt, RenderbufferTarget.RenderbufferExt, CubemapDepthRenderbuffer[i]);
}
GLEx.CheckFboStatus();
GL.Ext.BindFramebuffer(FramebufferTarget.FramebufferExt, 0); // return to visible framebuffer
}
private void CreateCubemapBuffers()
{
CubemapFboHandle = new uint[6];
CubemapColorTexture = new uint[6];
CubemapDepthRenderbuffer = new uint[6];
cubemapDirections = new Vector3[6];
cubemapDirections[0] = new Vector3(0.0f, 0.0f, 1.0f);
cubemapDirections[1] = new Vector3(0.0f, 0.0f, -1.0f);
cubemapDirections[2] = new Vector3(0.0f, 1.0f, 0.0f);
cubemapDirections[3] = new Vector3(0.0f, -1.0f, 0.0f);
cubemapDirections[4] = new Vector3(1.0f, 0.0f, 0.0f);
cubemapDirections[5] = new Vector3(-1.0f, 0.0f, 0.0f);
cubemapUps = new Vector3[6];
cubemapUps[0] = Vector3.UnitY;
cubemapUps[1] = Vector3.UnitY;
cubemapUps[2] = Vector3.UnitZ;
cubemapUps[3] = Vector3.UnitZ;
cubemapUps[4] = Vector3.UnitY;
cubemapUps[5] = Vector3.UnitY;
cubemapColorBuffers = new RGB[6][];
for (int i = 0; i < 6; i++)
cubemapColorBuffers[i] = new RGB[CubemapWidth * CubemapHeight];
cubemapDepthBuffers = new float[6][];
for (int i = 0; i < 6; i++)
cubemapDepthBuffers[i] = new float[CubemapWidth * CubemapHeight];
cubemapProjections = new Matrix4[6];
// Create Color Texture
GL.GenTextures(6, CubemapColorTexture);
for (int i = 0; i < CubemapColorTexture.Length; i++)
{
GL.BindTexture(TextureTarget.Texture2D, CubemapColorTexture[i]);
GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureMinFilter, (int)TextureMinFilter.Nearest);
GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureMagFilter, (int)TextureMagFilter.Nearest);
GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureWrapS, (int)TextureWrapMode.Clamp);
GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureWrapT, (int)TextureWrapMode.Clamp);
GL.TexImage2D(TextureTarget.Texture2D, 0, PixelInternalFormat.Rgba8, CubemapWidth, CubemapHeight, 0, PixelFormat.Rgba, PixelType.UnsignedByte, IntPtr.Zero);
}
// test for GL Error here (might be unsupported format)
GL.BindTexture(TextureTarget.Texture2D, 0); // prevent feedback, reading and writing to the same image is a bad idea
// Create Depth Renderbuffer
GL.Ext.GenRenderbuffers(6, CubemapDepthRenderbuffer);
for (int i = 0; i < CubemapDepthRenderbuffer.Length; i++)
{
GL.Ext.BindRenderbuffer(RenderbufferTarget.RenderbufferExt, CubemapDepthRenderbuffer[i]);
GL.Ext.RenderbufferStorage(RenderbufferTarget.RenderbufferExt, (RenderbufferStorage)All.DepthComponent32, CubemapWidth, CubemapHeight);
}
// test for GL Error here (might be unsupported format)
// Create a FBO and attach the textures
GL.Ext.GenFramebuffers(6, CubemapFboHandle);
for (int i = 0; i < CubemapFboHandle.Length; i++)
{
GL.Ext.BindFramebuffer(FramebufferTarget.FramebufferExt, CubemapFboHandle[i]);
GL.Ext.FramebufferTexture2D(FramebufferTarget.FramebufferExt, FramebufferAttachment.ColorAttachment0Ext, TextureTarget.Texture2D, CubemapColorTexture[i], 0);
GL.Ext.FramebufferRenderbuffer(FramebufferTarget.FramebufferExt, FramebufferAttachment.DepthAttachmentExt, RenderbufferTarget.RenderbufferExt, CubemapDepthRenderbuffer[i]);
}
GLEx.CheckFboStatus();
GL.Ext.BindFramebuffer(FramebufferTarget.FramebufferExt, 0); // return to visible framebuffer
}
