From 86cc23b0adb7bf712a941e3e044985b4ba143992 Mon Sep 17 00:00:00 2001
From: cosmonaut <evan@moonside.games>
Date: Thu, 6 Aug 2020 17:58:50 -0700
Subject: [PATCH] start on depth rendering

---
 Effects/FXB/SimpleDepthEffect.fxb | Bin 0 -> 624 bytes
 Effects/HLSL/SimpleDepthEffect.fx |  36 +++++++++++++
 Effects/SimpleDepthEffect.cs      |  68 +++++++++++++++++++++++++
 Renderer.cs                       |  82 +++++++++++++++++++++++++++---
 Resources.cs                      |  13 +++++
 5 files changed, 191 insertions(+), 8 deletions(-)
 create mode 100644 Effects/FXB/SimpleDepthEffect.fxb
 create mode 100644 Effects/HLSL/SimpleDepthEffect.fx
 create mode 100644 Effects/SimpleDepthEffect.cs

diff --git a/Effects/FXB/SimpleDepthEffect.fxb b/Effects/FXB/SimpleDepthEffect.fxb
new file mode 100644
index 0000000000000000000000000000000000000000..e2baafe615d1a37379d63f36ed61dd4b2d97395b
GIT binary patch
literal 624
zcmZSN{QqwS0|YPwDJCFJfN;Si3y=h1N`VN_0N?zS)SR%))bfC${H)aElFa-(21cN`
z01%_w0TKrR9v}|R%q_@CbxAEK$pEVd$${Jn!XSMLKnw#jpbU_j2}tZoP<9QFu0Rrp
zG8z5@0gN31(#-tt|G)o649+2rPBK95Y>*^S3?v2O1A)R6AYlN+5O**!xB%H9K#a|w
z%nZyxx3YlU4^%=iC@YRPjyGWN%}g%JFV0UZQP2p|RPgW#_E8AVNK8pBQgF`CEy&CP
zG7Js$3>j7jGBB{RFz_#6U}&&Mwp<?K{00UF{s~Cz2f%OzB7UH_$^;e$hXpJQq6;{I
lA;7@E_<(`o2~hkAl+Og_Gs5{SU_KL^&jIE$1Nop31^{3~Px=4=

literal 0
HcmV?d00001

diff --git a/Effects/HLSL/SimpleDepthEffect.fx b/Effects/HLSL/SimpleDepthEffect.fx
new file mode 100644
index 0000000..8b19a4e
--- /dev/null
+++ b/Effects/HLSL/SimpleDepthEffect.fx
@@ -0,0 +1,36 @@
+#include "Macros.fxh"
+
+BEGIN_CONSTANTS
+
+    float4x4 ModelViewProjection    _vs(c0)             _cb(c0);
+
+MATRIX_CONSTANTS
+
+END_CONSTANTS
+
+struct VertexShaderInput
+{
+    float4 Position : POSITION;
+};
+
+struct VertexShaderOutput
+{
+    float4 Position : SV_Position;
+};
+
+VertexShaderOutput main_vs(VertexShaderInput input)
+{
+    VertexShaderOutput output;
+
+    output.Position = mul(float4(input.Position.xyz, 1.0), ModelViewProjection);
+
+    return output;
+}
+
+Technique SimpleDepth
+{
+    Pass
+    {
+        VertexShader = compile vs_3_0 main_vs();
+    }
+}
diff --git a/Effects/SimpleDepthEffect.cs b/Effects/SimpleDepthEffect.cs
new file mode 100644
index 0000000..f68f513
--- /dev/null
+++ b/Effects/SimpleDepthEffect.cs
@@ -0,0 +1,68 @@
+using Microsoft.Xna.Framework;
+using Microsoft.Xna.Framework.Graphics;
+
+namespace Kav
+{
+    public class SimpleDepthEffect : Effect
+    {
+        EffectParameter modelViewProjectionParam;
+
+        Matrix model;
+        Matrix view;
+        Matrix projection;
+
+        EffectDirtyFlags dirtyFlags = EffectDirtyFlags.All;
+
+        public Matrix Model
+        {
+            get { return model; }
+            set
+            {
+                model = value;
+                dirtyFlags |= EffectDirtyFlags.WorldViewProj;
+            }
+        }
+
+        public Matrix View
+        {
+            get { return view; }
+            set
+            {
+                view = value;
+                dirtyFlags |= EffectDirtyFlags.WorldViewProj;
+            }
+        }
+
+        public Matrix Projection
+        {
+            get { return projection; }
+            set
+            {
+                projection = value;
+                dirtyFlags |= EffectDirtyFlags.WorldViewProj;
+            }
+        }
+        public SimpleDepthEffect(GraphicsDevice graphicsDevice) : base(graphicsDevice, Resources.SimpleDepthEffect)
+        {
+            CacheEffectParameters();
+        }
+
+        protected override void OnApply()
+        {
+            if ((dirtyFlags & EffectDirtyFlags.WorldViewProj) != 0)
+            {
+                Matrix.Multiply(ref model, ref view, out Matrix modelView);
+                Matrix.Multiply(ref modelView, ref projection, out Matrix worldViewProj);
+
+                modelViewProjectionParam.SetValue(worldViewProj);
+
+                dirtyFlags &= ~EffectDirtyFlags.WorldViewProj;
+            }
+        }
+
+        private void CacheEffectParameters()
+        {
+            modelViewProjectionParam = Parameters["ModelViewProjection"];
+        }
+    }
+}
diff --git a/Renderer.cs b/Renderer.cs
index 4f71cac..79b078d 100644
--- a/Renderer.cs
+++ b/Renderer.cs
@@ -1,23 +1,89 @@
 using System.Collections.Generic;
+using Microsoft.Xna.Framework;
 using Microsoft.Xna.Framework.Graphics;
 
 namespace Kav
 {
-    public static class Renderer
+    public class Renderer
     {
-        public static void Render(GraphicsDevice graphicsDevice, Camera camera, IEnumerable<Model> models, IEnumerable<PointLight> pointLights)
-        {
-            var view = camera.View;
-            var projection = camera.Projection;
+        private GraphicsDevice GraphicsDevice { get; }
+        private int RenderDimensionsX { get; }
+        private int RenderDimensionsY { get; }
 
+        private RenderTarget2D DepthRenderTarget { get; }
+        private SimpleDepthEffect SimpleDepthEffect { get; }
+
+        public Renderer(GraphicsDevice graphicsDevice, int renderDimensionsX, int renderDimensionsY)
+        {
+            GraphicsDevice = graphicsDevice;
+            RenderDimensionsX = renderDimensionsX;
+            RenderDimensionsY = renderDimensionsY;
+
+            DepthRenderTarget = new RenderTarget2D(
+                GraphicsDevice,
+                renderDimensionsX,
+                renderDimensionsY,
+                false,
+                SurfaceFormat.Color,
+                DepthFormat.Depth24
+            );
+
+            SimpleDepthEffect = new SimpleDepthEffect(GraphicsDevice);
+        }
+
+        public void Render(Camera camera, IEnumerable<Model> models, IEnumerable<PointLight> pointLights)
+        {
+            Render(camera.View, camera.Projection, models, pointLights);
+        }
+
+        // for shadow mapping
+        public void DepthRender(Matrix view, Matrix projection, IEnumerable<(Model, Matrix)> modelTransforms, IEnumerable<PointLight> pointLights)
+        {
+            GraphicsDevice.SetRenderTarget(DepthRenderTarget);
+            GraphicsDevice.Clear(ClearOptions.DepthBuffer, Color.Black, 1, 0);
+
+            SimpleDepthEffect.View = view;
+            SimpleDepthEffect.Projection = projection;
+
+            foreach (var (model, transform) in modelTransforms)
+            {
+                foreach (var modelMesh in model.Meshes)
+                {
+                    foreach (var meshPart in modelMesh.MeshParts)
+                    {
+                        GraphicsDevice.SetVertexBuffer(meshPart.VertexBuffer);
+                        GraphicsDevice.Indices = meshPart.IndexBuffer;
+
+                        SimpleDepthEffect.Model = transform;
+
+                        foreach (var pass in SimpleDepthEffect.CurrentTechnique.Passes)
+                        {
+                            pass.Apply();
+
+                            GraphicsDevice.DrawIndexedPrimitives(
+                                PrimitiveType.TriangleList,
+                                0,
+                                0,
+                                meshPart.VertexBuffer.VertexCount,
+                                0,
+                                meshPart.Triangles.Length
+                            );
+                        }
+                    }
+                }
+            }
+        }
+
+        private void Render(Matrix view, Matrix projection, IEnumerable<Model> models, IEnumerable<PointLight> pointLights)
+        {
             foreach (var model in models)
             {
                 foreach (var modelMesh in model.Meshes)
                 {
                     foreach (var meshPart in modelMesh.MeshParts)
                     {
-                        graphicsDevice.SetVertexBuffer(meshPart.VertexBuffer);
-                        graphicsDevice.Indices = meshPart.IndexBuffer;
+                        GraphicsDevice.SetVertexBuffer(meshPart.VertexBuffer);
+                        GraphicsDevice.Indices = meshPart.IndexBuffer;
 
                         if (meshPart.Effect is TransformEffect transformEffect)
                         {
@@ -40,7 +106,7 @@ namespace Kav
                         {
                             pass.Apply();
 
-                            graphicsDevice.DrawIndexedPrimitives(
+                            GraphicsDevice.DrawIndexedPrimitives(
                                 PrimitiveType.TriangleList,
                                 0,
                                 0,
diff --git a/Resources.cs b/Resources.cs
index e20f87b..4964b4a 100644
--- a/Resources.cs
+++ b/Resources.cs
@@ -16,7 +16,20 @@ namespace Kav
             }
         }
 
+        public static byte[] SimpleDepthEffect
+        {
+            get
+            {
+                if (simpleDepthEffect == null)
+                {
+                    simpleDepthEffect = GetResource("SimpleDepthEffecT");
+                }
+                return simpleDepthEffect;
+            }
+        }
+
         private static byte[] pbrEffect;
+        private static byte[] simpleDepthEffect;
 
         private static byte[] GetResource(string name)
         {