public static uint RenderToCubemap(ShaderComponent shader, int resolution, Action preRender)
{
var cube = new Cube();
var captureFbo = Gl.GenFramebuffer();
Gl.BindFramebuffer(FramebufferTarget.Framebuffer, captureFbo);
var colorTexture = Gl.GenTexture();
Gl.BindTexture(TextureTarget.Texture2d, colorTexture);
Gl.TexImage2D(TextureTarget.Texture2d, 0, InternalFormat.Srgb, GameSettings.GameResolutionX, GameSettings.GameResolutionY, 0, PixelFormat.Rgb, PixelType.Float, IntPtr.Zero);
Gl.TexParameter(TextureTarget.Texture2d, TextureParameterName.TextureMinFilter, (int)TextureMinFilter.NearestMipmapNearest);
Gl.TexParameter(TextureTarget.Texture2d, TextureParameterName.TextureMagFilter, (int)TextureMagFilter.Nearest);
Gl.TexParameter(TextureTarget.Texture2d, TextureParameterName.TextureWrapS, (int)TextureWrapMode.ClampToEdge);
Gl.TexParameter(TextureTarget.Texture2d, TextureParameterName.TextureWrapT, (int)TextureWrapMode.ClampToEdge);
Gl.FramebufferTexture2D(FramebufferTarget.Framebuffer, FramebufferAttachment.ColorAttachment0, TextureTarget.Texture2d, colorTexture, 0);
var envCubemap = Gl.GenTexture();
Gl.BindTexture(TextureTarget.TextureCubeMap, envCubemap);
for (int i = 0; i < 6; ++i)
{
Gl.TexImage2D(TextureTarget.TextureCubeMapPositiveX + i, 0, InternalFormat.Srgb, resolution, resolution, 0, PixelFormat.Rgb, PixelType.Float, IntPtr.Zero);
}
Gl.TexParameter(TextureTarget.TextureCubeMap, TextureParameterName.TextureMinFilter, (int)TextureMinFilter.Linear);
Gl.TexParameter(TextureTarget.TextureCubeMap, TextureParameterName.TextureMagFilter, (int)TextureMagFilter.Linear);
Gl.TexParameter(TextureTarget.TextureCubeMap, TextureParameterName.TextureWrapS, (int)TextureWrapMode.ClampToEdge);
Gl.TexParameter(TextureTarget.TextureCubeMap, TextureParameterName.TextureWrapT, (int)TextureWrapMode.ClampToEdge);
Gl.TexParameter(TextureTarget.TextureCubeMap, TextureParameterName.TextureWrapR, (int)TextureWrapMode.ClampToEdge);
var projMatrix = Matrix4x4.CreatePerspectiveFieldOfView(90f * 0.0174533f, 1.0f, 0.1f, 10.0f);
var viewMatrices = new Matrix4x4[]
{
Matrix4x4.CreateLookAt(new Vector3(0f, 0f, 0f), new Vector3(1f, 0f, 0f), new Vector3(0f, -1f, 0f)),
Matrix4x4.CreateLookAt(new Vector3(0f, 0f, 0f), new Vector3(-1f, 0f, 0f), new Vector3(0f, -1f, 0f)),
Matrix4x4.CreateLookAt(new Vector3(0f, 0f, 0f), new Vector3(0f, 1f, 0f), new Vector3(0f, 0f, 1f)),
Matrix4x4.CreateLookAt(new Vector3(0f, 0f, 0f), new Vector3(0f, -1f, 0f), new Vector3(0f, 0f, -1f)),
Matrix4x4.CreateLookAt(new Vector3(0f, 0f, 0f), new Vector3(0f, 0f, 1f), new Vector3(0f, -1f, 0f)),
Matrix4x4.CreateLookAt(new Vector3(0f, 0f, 0f), new Vector3(0f, 0f, -1f), new Vector3(0f, -1f, 0f)),
};
shader.Use();
preRender.Invoke();
shader.SetMatrix("projectionMatrix", projMatrix);
Gl.Viewport(0, 0, resolution, resolution);
Gl.BindFramebuffer(FramebufferTarget.Framebuffer, captureFbo);
for (int i = 0; i < 6; ++i)
{
shader.SetMatrix("viewMatrix", viewMatrices[i]);
Gl.FramebufferTexture2D(FramebufferTarget.Framebuffer, FramebufferAttachment.ColorAttachment0, TextureTarget.TextureCubeMapPositiveX + i, envCubemap, 0);
Gl.Clear(ClearBufferMask.ColorBufferBit | ClearBufferMask.DepthBufferBit);
cube.Draw();
}
Gl.BindFramebuffer(FramebufferTarget.Framebuffer, 0);
return(envCubemap);
}
public static uint CreateBrdfLut()
{
var fs = ServiceLocator.FileSystem;
var shader = new ShaderComponent(fs.GetAsset("/Shaders/BrdfLut/brdfLut.frag"), fs.GetAsset("/Shaders/BrdfLut/brdfLut.vert"));
var brdfLutTexture = Gl.GenTexture();
var plane = new Primitives.Plane();
Gl.BindTexture(TextureTarget.Texture2d, brdfLutTexture);
Gl.TexImage2D(TextureTarget.Texture2d, 0, InternalFormat.Rg16f, 512, 512, 0, PixelFormat.Rg, PixelType.Float, IntPtr.Zero);
Gl.TexParameter(TextureTarget.Texture2d, TextureParameterName.TextureMinFilter, (int)TextureMinFilter.Linear);
Gl.TexParameter(TextureTarget.Texture2d, TextureParameterName.TextureMagFilter, (int)TextureMagFilter.Linear);
Gl.TexParameter(TextureTarget.Texture2d, TextureParameterName.TextureWrapS, (int)TextureWrapMode.ClampToEdge);
Gl.TexParameter(TextureTarget.Texture2d, TextureParameterName.TextureWrapT, (int)TextureWrapMode.ClampToEdge);
var captureFbo = Gl.GenFramebuffer();
Gl.BindFramebuffer(FramebufferTarget.Framebuffer, captureFbo);
Gl.FramebufferTexture2D(FramebufferTarget.Framebuffer, FramebufferAttachment.ColorAttachment0, TextureTarget.Texture2d, brdfLutTexture, 0);
Gl.Viewport(0, 0, 512, 512);
shader.Use();
// Gl.ClearColor(1.0f, 1.0f, 1.0f, 1.0f);
Gl.Clear(ClearBufferMask.ColorBufferBit | ClearBufferMask.DepthBufferBit);
Gl.Disable(EnableCap.DepthTest);
Gl.Disable(EnableCap.CullFace);
plane.DrawRaw();
Gl.Enable(EnableCap.DepthTest);
Gl.Enable(EnableCap.CullFace);
Gl.BindFramebuffer(FramebufferTarget.Framebuffer, 0);
return(brdfLutTexture);
}
public void SetTechnique(ShaderCollection shaderCollection, string techniqueKey)
{
this.shaderCollection = shaderCollection;
Content.Store(shaderCollection.Name, shaderCollection);
cShader = new ShaderComponent {
AssetName = shaderCollection.Name, Key = techniqueKey
};
vsFlags = shaderCollection[techniqueKey].Key.VertexShader;
}
public void Draw(ShaderComponent shader, uint diffuseTexture)
{
shader.Use();
Gl.ActiveTexture(TextureUnit.Texture0);
Gl.BindTexture(TextureTarget.Texture2d, diffuseTexture);
shader.SetInt("diffuseTexture", 0);
Gl.ActiveTexture(TextureUnit.Texture0);
DrawRaw();
}
private void LoadBaseContent()
{
var fs = ServiceLocator.FileSystem;
depthShader = new ShaderComponent(fs.GetAsset("/Shaders/Depth/depth.frag"), fs.GetAsset("/Shaders/Depth/depth.vert"));
framebufferRenderShader = new ShaderComponent(fs.GetAsset("/Shaders/Framebuffer/framebuffer.frag"), fs.GetAsset("/Shaders/Framebuffer/framebuffer.vert"));
framebufferRenderPlane = new Primitives.Plane();
brdfLut = new Texture()
{
Id = EquirectangularToCubemap.CreateBrdfLut(),
Path = "brdfLut",
Type = "texture_lut"
};
holoTexture = Texture.LoadFromAsset(fs.GetAsset("/Textures/holoMap.png"), "texture_diffuse");
}
public static (Cubemap, Cubemap, Cubemap) Convert(string hdriPath)
{
Gl.Disable(EnableCap.CullFace);
var fs = ServiceLocator.FileSystem;
var equirectangularToCubemapShader = new ShaderComponent(fs.GetAsset("/Shaders/EquirectangularToCubemap/EquirectangularToCubemap.frag"), fs.GetAsset("/Shaders/EquirectangularToCubemap/EquirectangularToCubemap.vert"));
var convolutionShader = new ShaderComponent(fs.GetAsset("/Shaders/Convolution/convolution.frag"), fs.GetAsset("/Shaders/Convolution/convolution.vert"));
var prefilterShader = new ShaderComponent(fs.GetAsset("/Shaders/Prefilter/prefilter.frag"), fs.GetAsset("/Shaders/Prefilter/prefilter.vert"));
var skyHdri = HdriTexture.LoadFromAsset(fs.GetAsset(hdriPath));
var envMap = new Cubemap(RenderToCubemap(equirectangularToCubemapShader, 512, () =>
{
equirectangularToCubemapShader.SetInt("equirectangularMap", 0);
Gl.ActiveTexture(TextureUnit.Texture0);
Gl.BindTexture(TextureTarget.Texture2d, skyHdri.Id);
}));
var convMap = new Cubemap(RenderToCubemap(convolutionShader, 64, () =>
{
convolutionShader.SetInt("environmentMap", 0);
Gl.ActiveTexture(TextureUnit.Texture0);
Gl.BindTexture(TextureTarget.TextureCubeMap, envMap.Id);
}));
var prefMap = new Cubemap(CreatePrefilteredEnvironmentMap(prefilterShader, () =>
{
prefilterShader.SetInt("environmentMap", 0);
Gl.ActiveTexture(TextureUnit.Texture0);
Gl.BindTexture(TextureTarget.TextureCubeMap, envMap.Id);
}));
Gl.Enable(EnableCap.CullFace);
return(
envMap,
convMap,
prefMap
);
}
private static uint CreatePrefilteredEnvironmentMap(ShaderComponent shader, Action preRender)
{
var cube = new Cube();
var captureFbo = Gl.GenFramebuffer();
Gl.BindFramebuffer(FramebufferTarget.Framebuffer, captureFbo);
var captureRbo = Gl.GenRenderbuffer();
Gl.BindRenderbuffer(RenderbufferTarget.Renderbuffer, captureRbo);
Gl.RenderbufferStorage(RenderbufferTarget.Renderbuffer, InternalFormat.DepthComponent24, 128, 128);
Gl.FramebufferRenderbuffer(FramebufferTarget.Framebuffer, FramebufferAttachment.DepthAttachment, RenderbufferTarget.Renderbuffer, captureRbo);
var prefilterMap = Gl.GenTexture();
Gl.BindTexture(TextureTarget.TextureCubeMap, prefilterMap);
for (int i = 0; i < 6; ++i)
{
Gl.TexImage2D(TextureTarget.TextureCubeMapPositiveX + i, 0, InternalFormat.Rgb16f, 128, 128, 0, PixelFormat.Rgb, PixelType.Float, IntPtr.Zero);
}
Gl.TexParameter(TextureTarget.TextureCubeMap, TextureParameterName.TextureMinFilter, (int)TextureMinFilter.LinearMipmapLinear);
Gl.TexParameter(TextureTarget.TextureCubeMap, TextureParameterName.TextureMagFilter, (int)TextureMagFilter.Linear);
Gl.TexParameter(TextureTarget.TextureCubeMap, TextureParameterName.TextureWrapS, (int)TextureWrapMode.ClampToEdge);
Gl.TexParameter(TextureTarget.TextureCubeMap, TextureParameterName.TextureWrapT, (int)TextureWrapMode.ClampToEdge);
Gl.TexParameter(TextureTarget.TextureCubeMap, TextureParameterName.TextureWrapR, (int)TextureWrapMode.ClampToEdge);
Gl.GenerateMipmap(TextureTarget.TextureCubeMap);
var projMatrix = Matrix4x4.CreatePerspectiveFieldOfView(90f * 0.0174533f, 1.0f, 0.1f, 10.0f);
var viewMatrices = new Matrix4x4[]
{
Matrix4x4.CreateLookAt(new Vector3(0f, 0f, 0f), new Vector3(1f, 0f, 0f), new Vector3(0f, -1f, 0f)),
Matrix4x4.CreateLookAt(new Vector3(0f, 0f, 0f), new Vector3(-1f, 0f, 0f), new Vector3(0f, -1f, 0f)),
Matrix4x4.CreateLookAt(new Vector3(0f, 0f, 0f), new Vector3(0f, 1f, 0f), new Vector3(0f, 0f, 1f)),
Matrix4x4.CreateLookAt(new Vector3(0f, 0f, 0f), new Vector3(0f, -1f, 0f), new Vector3(0f, 0f, -1f)),
Matrix4x4.CreateLookAt(new Vector3(0f, 0f, 0f), new Vector3(0f, 0f, 1f), new Vector3(0f, -1f, 0f)),
Matrix4x4.CreateLookAt(new Vector3(0f, 0f, 0f), new Vector3(0f, 0f, -1f), new Vector3(0f, -1f, 0f)),
};
shader.Use();
preRender.Invoke();
shader.SetMatrix("projectionMatrix", projMatrix);
Gl.BindFramebuffer(FramebufferTarget.Framebuffer, captureFbo);
int mipLevels = 5;
for (int mips = 0; mips < mipLevels; ++mips)
{
int mipSize = (int)(128 * (float)Math.Pow(0.5, mips));
Gl.BindRenderbuffer(RenderbufferTarget.Renderbuffer, captureRbo);
Gl.RenderbufferStorage(RenderbufferTarget.Renderbuffer, InternalFormat.DepthComponent24, mipSize, mipSize);
Gl.Viewport(0, 0, mipSize, mipSize);
float roughness = mips / (float)(mipLevels - 1);
shader.SetFloat("roughness", roughness);
for (int i = 0; i < 6; ++i)
{
shader.SetMatrix("viewMatrix", viewMatrices[i]);
Gl.FramebufferTexture2D(FramebufferTarget.Framebuffer, FramebufferAttachment.ColorAttachment0, TextureTarget.TextureCubeMapPositiveX + i, prefilterMap, mips);
Gl.Clear(ClearBufferMask.ColorBufferBit | ClearBufferMask.DepthBufferBit);
cube.Draw();
}
}
Gl.BindFramebuffer(FramebufferTarget.Framebuffer, 0);
return(prefilterMap);
}
public void ConvShader(ShaderComponent shaderComponent)
{
}