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Add experimental shadow map.

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UnknownShadow200 2015-02-22 12:32:06 +11:00
parent b673944a61
commit 2853821e21
2 changed files with 108 additions and 0 deletions
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1
ClassicalSharp.csproj
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@ -108,6 +108,7 @@
<Compile Include="Camera.cs" />
<Compile Include="Commands\Command.cs" />
<Compile Include="Commands\DefaultCommands.cs" />
<Compile Include="GraphicsAPI\ShadowMap.cs" />
<Compile Include="GraphicsAPI\VertexFormats.cs" />
<Compile Include="Map.cs" />
<Compile Include="MeshBuilders\ChunkMeshBuilder.cs" />

107
GraphicsAPI/ShadowMap.cs Normal file
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@ -0,0 +1,107 @@
using System;
using OpenTK.Graphics.OpenGL;
using OpenTK;
using OpenTK.Graphics;
namespace ClassicalSharp.GraphicsAPI {
public abstract class ShadowMap {
public Vector3 LightPosition;
public Vector3 LightTarget;
public Matrix4 ShadowMatrix;
public abstract void Create( int width, int height );
public abstract void BindForReading( IGraphicsApi graphics );
public abstract void BindForWriting( IGraphicsApi graphics );
public abstract void SetupState( IGraphicsApi graphics, Game game );
public abstract void RestoreState( IGraphicsApi graphics, Game g );
public abstract void Dispose();
}
public sealed class OpenGLShadowMap : ShadowMap {
int depthTextureId, fboId;
int fboWidth, fboHeight;
public override void Create( int width, int height ) {
GL.GenTextures( 1, out depthTextureId );
GL.BindTexture( TextureTarget.Texture2D, depthTextureId );
GL.TexParameter( TextureTarget.Texture2D, TextureParameterName.TextureMinFilter, (int)All.Nearest );
GL.TexParameter( TextureTarget.Texture2D, TextureParameterName.TextureMagFilter, (int)All.Nearest );
GL.TexParameter( TextureTarget.Texture2D, TextureParameterName.TextureWrapS, (int)All.Clamp );
GL.TexParameter( TextureTarget.Texture2D, TextureParameterName.TextureWrapT, (int)All.Clamp );
GL.TexImage2D( TextureTarget.Texture2D, 0, PixelInternalFormat.DepthComponent,
width, height, 0, PixelFormat.DepthComponent,
PixelType.UnsignedByte, IntPtr.Zero );
GL.BindTexture( TextureTarget.Texture2D, 0);
GL.Ext.GenFramebuffers( 1, out fboId );
GL.Ext.BindFramebuffer( FramebufferTarget.Framebuffer, fboId );
GL.DrawBuffer( DrawBufferMode.None );
GL.ReadBuffer( (ReadBufferMode)DrawBufferMode.None );
GL.Ext.FramebufferTexture2D( FramebufferTarget.Framebuffer, FramebufferAttachment.DepthAttachment,
TextureTarget.Texture2D, depthTextureId, 0 );
FramebufferErrorCode status = GL.Ext.CheckFramebufferStatus( FramebufferTarget.Framebuffer );
if( status != FramebufferErrorCode.FramebufferComplete ) Console.WriteLine( "ERROR FBO: " + status );
GL.Ext.BindFramebuffer( FramebufferTarget.Framebuffer, 0 );
GL.TexParameter( TextureTarget.Texture2D, TextureParameterName.TextureWrapS, (int)All.Repeat );
GL.TexParameter( TextureTarget.Texture2D, TextureParameterName.TextureWrapT, (int)All.Repeat );
fboWidth = width;
fboHeight = height;
}
public override void BindForReading( IGraphicsApi graphics ) {
GL.Ext.BindFramebuffer( FramebufferTarget.Framebuffer, fboId );
}
public override void BindForWriting( IGraphicsApi graphics ) {
GL.Arb.ActiveTexture( TextureUnit.Texture1 );
GL.BindTexture( TextureTarget.Texture2D, depthTextureId );
GL.Arb.ActiveTexture( TextureUnit.Texture0 );
}
public override void SetupState( IGraphicsApi graphics, Game game ) {
graphics.SetMatrixMode( MatrixType.Projection );
graphics.PushMatrix();
Matrix4 projection = Matrix4.CreatePerspectiveFieldOfView(
(float)Math.PI / 4, game.Width / (float)game.Height, 1, 40000 );
graphics.LoadMatrix( ref projection );
graphics.SetMatrixMode( MatrixType.Modelview );
graphics.PushMatrix();
Matrix4 modelview = Matrix4.LookAt( LightPosition, LightTarget, Vector3.UnitY );
graphics.LoadMatrix( ref modelview );
ShadowMatrix = modelview * projection * bias;
graphics.ColourMask( false, false, false, false );
GL.Viewport( 0, 0, fboWidth, fboHeight );
}
public override void RestoreState( IGraphicsApi graphics, Game game ) {
graphics.SetMatrixMode( MatrixType.Projection );
graphics.PopMatrix();
graphics.SetMatrixMode( MatrixType.Modelview );
graphics.PopMatrix();
graphics.ColourMask( true, true, true, true );
GL.Viewport( 0, 0, game.Width, game.Height );
}
static Matrix4 bias = new Matrix4(
0.5f, 0.0f, 0.0f, 0.0f,
0.0f, 0.5f, 0.0f, 0.0f,
0.0f, 0.0f, 0.5f, 0.0f,
0.5f, 0.5f, 0.5f, 1.0f
);
public override void Dispose() {
GL.DeleteTexture( depthTextureId );
GL.Ext.DeleteFramebuffers( 1, ref fboId );
}
}
}