public void FillDepthCubeMap(PointLightCaster light)
{
GL.BindTexture(TextureTarget.ProxyTextureCubeMap, DepthCubeMapId);
GL.BindFramebuffer(FramebufferTarget.Framebuffer, depthMapBufferId);
GL.FramebufferTexture2D(FramebufferTarget.Framebuffer, FramebufferAttachment.DepthAttachment, TextureTarget.TextureCubeMap, DepthMapId, 0);
GL.DrawBuffer(DrawBufferMode.None);
GL.ReadBuffer(ReadBufferMode.None);
GL.Clear(ClearBufferMask.DepthBufferBit);
GL.Enable(EnableCap.DepthTest);
RenderAPI.I.Core.Log.Info($"[Render] Depth buffer cubemap status: {GL.CheckFramebufferStatus(FramebufferTarget.Framebuffer)}");
//set shader
var shaderProgram = LoadSpecificShader("depthCubeMap", "depthCubeMap");
if (!shaderProgram.CanBeUsed)
{
throw new Exception($"FillDepthCubeMap: shader can't be used");
}
shaderProgram.Use();
SetShadowTransforms(light, shaderProgram);
#region fill depthmap
foreach (var entity in _scene.RenderableEntities)
{
var renderComponent = entity.Value;
GL.BindVertexArray(Engine.I.Device.Buffers[renderComponent.Mesh.Id].VertexArrayObjectId);
GL.UniformMatrix4(GL.GetUniformLocation(shaderProgram.ProgramId, "model"), 1, false, entity.Key.TransformMatrix.Values);
if (renderComponent.Material.HasDiffuse)
{
Engine.I.Device.Textures[renderComponent.Material.Diffuse].Bind(0);
}
if (renderComponent.Material.HasNormal)
{
Engine.I.Device.Textures[renderComponent.Material.Normal].Bind(1);
}
GL.DrawArrays(PrimitiveType.Triangles, 0, renderComponent.Mesh.IndexLength);
}
#endregion
GL.BindTexture(TextureTarget.ProxyTextureCubeMap, 0);
GL.BindFramebuffer(FramebufferTarget.Framebuffer, 0);
GL.Disable(EnableCap.DepthTest);
}
private void SetShadowTransforms(PointLightCaster light, ShaderProgram shaderProgram)
{
Func <Vec3, Vec3, Mat4> getView = (direction, up) => Transform.LookAt(light.Position, light.Position + direction, up);
GL.UniformMatrix4(GL.GetUniformLocation(shaderProgram.ProgramId, "shadowMatrices[0]"), 1, false,
(getView(new Vec3(1.0f, 0.0f, 0.0f), new Vec3(0.0f, -1.0f, 0.0f)) * light.Proj).Values);
GL.UniformMatrix4(GL.GetUniformLocation(shaderProgram.ProgramId, "shadowMatrices[1]"), 1, false,
(getView(new Vec3(-1.0f, 0.0f, 0.0f), new Vec3(0.0f, -1.0f, 0.0f)) * light.Proj).Values);
GL.UniformMatrix4(GL.GetUniformLocation(shaderProgram.ProgramId, "shadowMatrices[2]"), 1, false,
(getView(new Vec3(0.0f, 1.0f, 0.0f), new Vec3(0.0f, 0.0f, 1.0f)) * light.Proj).Values);
GL.UniformMatrix4(GL.GetUniformLocation(shaderProgram.ProgramId, "shadowMatrices[3]"), 1, false,
(getView(new Vec3(0.0f, -1.0f, 0.0f), new Vec3(0.0f, 0.0f, -1.0f)) * light.Proj).Values);
GL.UniformMatrix4(GL.GetUniformLocation(shaderProgram.ProgramId, "shadowMatrices[4]"), 1, false,
(getView(new Vec3(0.0f, 0.0f, 1.0f), new Vec3(0.0f, -1.0f, 0.0f)) * light.Proj).Values);
GL.UniformMatrix4(GL.GetUniformLocation(shaderProgram.ProgramId, "shadowMatrices[5]"), 1, false,
(getView(new Vec3(0.0f, 0.0f, -1.0f), new Vec3(0.0f, -1.0f, 0.0f)) * light.Proj).Values);
GL.Uniform3(GL.GetUniformLocation(shaderProgram.ProgramId, "lightPos"), 1, light.Position.Values);
GL.Uniform1(GL.GetUniformLocation(shaderProgram.ProgramId, "far_plane"), 1, new[] { light.zFar });
}
