148 lines
4.6 KiB
C#
148 lines
4.6 KiB
C#
#region Copyright & License Information
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/*
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* Copyright 2007-2010 The OpenRA Developers (see AUTHORS)
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* This file is part of OpenRA, which is free software. It is made
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* available to you under the terms of the GNU General Public License
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* as published by the Free Software Foundation. For more information,
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* see LICENSE.
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*/
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#endregion
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using System;
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using System.IO;
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using OpenRA.FileFormats;
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using OpenRA.FileFormats.Graphics;
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using Tao.OpenGl;
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using System.Text;
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using System.Collections.Generic;
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namespace OpenRA.Renderer.Glsl
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{
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public class Shader : IShader
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{
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int program;
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readonly Dictionary<string, int> samplers = new Dictionary<string, int>();
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public Shader(GraphicsDevice dev, string type)
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{
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// Vertex shader
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string vertexCode;
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using (var file = new StreamReader(FileSystem.Open("glsl{0}{1}.vert".F(Path.DirectorySeparatorChar, type))))
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vertexCode = file.ReadToEnd();
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int v = Gl.glCreateShaderObjectARB(Gl.GL_VERTEX_SHADER_ARB);
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GraphicsDevice.CheckGlError();
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Gl.glShaderSourceARB(v,1,new string[]{vertexCode},null);
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GraphicsDevice.CheckGlError();
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Gl.glCompileShaderARB(v);
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GraphicsDevice.CheckGlError();
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int success;
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Gl.glGetObjectParameterivARB(v, Gl.GL_OBJECT_COMPILE_STATUS_ARB, out success);
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GraphicsDevice.CheckGlError();
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if (success == 0)
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throw new InvalidProgramException("Compile error in {0}{1}.vert".F(Path.DirectorySeparatorChar, type));
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// Fragment shader
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string fragmentCode;
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using (var file = new StreamReader(FileSystem.Open("glsl{0}{1}.frag".F(Path.DirectorySeparatorChar, type))))
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fragmentCode = file.ReadToEnd();
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int f = Gl.glCreateShaderObjectARB(Gl.GL_FRAGMENT_SHADER_ARB);
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GraphicsDevice.CheckGlError();
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Gl.glShaderSourceARB(f,1,new string[]{fragmentCode},null);
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GraphicsDevice.CheckGlError();
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Gl.glCompileShaderARB(f);
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GraphicsDevice.CheckGlError();
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Gl.glGetObjectParameterivARB(f, Gl.GL_OBJECT_COMPILE_STATUS_ARB, out success);
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GraphicsDevice.CheckGlError();
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if (success == 0)
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throw new InvalidProgramException("Compile error in glsl{0}{1}.frag".F(Path.DirectorySeparatorChar, type));
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// Assemble program
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program = Gl.glCreateProgramObjectARB();
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GraphicsDevice.CheckGlError();
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Gl.glAttachObjectARB(program,v);
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GraphicsDevice.CheckGlError();
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Gl.glAttachObjectARB(program,f);
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GraphicsDevice.CheckGlError();
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Gl.glLinkProgramARB(program);
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GraphicsDevice.CheckGlError();
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Gl.glGetObjectParameterivARB(program, Gl.GL_OBJECT_LINK_STATUS_ARB, out success);
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GraphicsDevice.CheckGlError();
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if (success == 0)
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throw new InvalidProgramException("Linking error in {0} shader".F(type));
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Gl.glUseProgramObjectARB(program);
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GraphicsDevice.CheckGlError();
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int numUniforms;
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Gl.glGetObjectParameterivARB( program, Gl.GL_ACTIVE_UNIFORMS, out numUniforms );
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GraphicsDevice.CheckGlError();
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int nextTexUnit = 1;
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for( int i = 0 ; i < numUniforms ; i++ )
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{
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int uLen, uSize, uType;
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var sb = new StringBuilder(128);
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Gl.glGetActiveUniformARB( program, i, 128, out uLen, out uSize, out uType, sb );
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GraphicsDevice.CheckGlError();
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if( uType == Gl.GL_SAMPLER_2D_ARB )
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{
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samplers.Add( sb.ToString(), nextTexUnit );
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Gl.glUniform1iARB( i, nextTexUnit );
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++nextTexUnit;
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}
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}
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}
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public void Render(Action a)
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{
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Gl.glUseProgramObjectARB(program);
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GraphicsDevice.CheckGlError();
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// Todo: Only enable alpha blending if we need it
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Gl.glEnable(Gl.GL_BLEND);
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GraphicsDevice.CheckGlError();
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Gl.glBlendFunc(Gl.GL_SRC_ALPHA, Gl.GL_ONE_MINUS_SRC_ALPHA);
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GraphicsDevice.CheckGlError();
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a();
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GraphicsDevice.CheckGlError();
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Gl.glDisable(Gl.GL_BLEND);
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GraphicsDevice.CheckGlError();
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}
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public void SetValue(string name, ITexture t)
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{
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if( t == null ) return;
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Gl.glUseProgramObjectARB(program);
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GraphicsDevice.CheckGlError();
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var texture = (Texture)t;
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int texUnit;
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if( samplers.TryGetValue( name, out texUnit ) )
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{
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Gl.glActiveTextureARB( Gl.GL_TEXTURE0_ARB + texUnit );
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GraphicsDevice.CheckGlError();
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Gl.glBindTexture( Gl.GL_TEXTURE_2D, texture.texture );
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GraphicsDevice.CheckGlError();
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Gl.glActiveTextureARB( Gl.GL_TEXTURE0_ARB );
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}
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}
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public void SetValue(string name, float x, float y)
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{
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Gl.glUseProgramObjectARB(program);
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GraphicsDevice.CheckGlError();
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int param = Gl.glGetUniformLocationARB(program, name);
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GraphicsDevice.CheckGlError();
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Gl.glUniform2fARB(param,x,y);
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GraphicsDevice.CheckGlError();
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}
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public void Commit() { }
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}
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}
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