private GLTexture2D CreateColorAttachment(int width, int height)
{
GLTexture2D texture = GLTexture2D.CreateUncompressedTexture(width, height,
PixelInternalFormat, PixelFormat.Rgba, PixelType.Float);
// Don't use mipmaps for color attachments.
texture.MinFilter = TextureMinFilter.Linear;
texture.MagFilter = TextureMagFilter.Linear;
texture.UpdateParameters();
return(texture);
}
public static GLTexture2D CreateTextureRender(GLTexture texture, int arrayLevel, int mipLevel, bool force = false)
{
if (!force && cubemapCache.ContainsKey(texture.ID.ToString()))
{
return(cubemapCache[texture.ID.ToString()]);
}
else
{
if (cubemapCache.ContainsKey(texture.ID.ToString()))
{
cubemapCache[texture.ID.ToString()]?.Dispose();
}
}
int width = texture.Width * 4;
int height = texture.Height * 3;
width = 512;
height = 256;
var shader = GlobalShaders.GetShader("EQUIRECTANGULAR");
var textureOutput = GLTexture2D.CreateUncompressedTexture(width, height, PixelInternalFormat.Rgba32f);
textureOutput.MipCount = texture.MipCount;
texture.Bind();
textureOutput.Bind();
textureOutput.GenerateMipmaps();
textureOutput.Unbind();
Framebuffer frameBuffer = new Framebuffer(FramebufferTarget.Framebuffer, width, height);
frameBuffer.Bind();
GL.Disable(EnableCap.Blend);
shader.Enable();
shader.SetBoolToInt("is_array", texture is GLTextureCubeArray);
if (texture is GLTextureCubeArray)
{
GL.ActiveTexture(TextureUnit.Texture1);
texture.Bind();
shader.SetInt("dynamic_texture_array", 1);
}
else
{
GL.ActiveTexture(TextureUnit.Texture1);
texture.Bind();
shader.SetInt("dynamic_texture", 1);
}
for (int i = 0; i < textureOutput.MipCount; i++)
{
int mipWidth = (int)(width * Math.Pow(0.5, i));
int mipHeight = (int)(height * Math.Pow(0.5, i));
frameBuffer.Resize(mipWidth, mipHeight);
GL.FramebufferTexture(FramebufferTarget.Framebuffer, FramebufferAttachment.ColorAttachment0,
textureOutput.ID, i);
shader.SetInt("arrayLevel", arrayLevel);
shader.SetInt("mipLevel", mipLevel);
GL.ClearColor(0, 0, 0, 0);
GL.Clear(ClearBufferMask.ColorBufferBit | ClearBufferMask.DepthBufferBit);
GL.Viewport(0, 0, mipWidth, mipHeight);
//Draw the texture onto the framebuffer
ScreenQuadRender.Draw();
break;
}
//Disable shader and textures
GL.UseProgram(0);
GL.BindTexture(TextureTarget.Texture2D, 0);
if (cubemapCache.ContainsKey(texture.ID.ToString()))
{
cubemapCache[texture.ID.ToString()] = textureOutput;
}
else
{
cubemapCache.Add(texture.ID.ToString(), textureOutput);
}
return(textureOutput);
}