66 lines
2.2 KiB
C#
66 lines
2.2 KiB
C#
using OpenTK.Graphics.OpenGL4;
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using OpenTK.Mathematics;
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namespace VoxelEngine.Rendering;
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public sealed class Shader : IDisposable
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{
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private readonly int _handle;
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private readonly Dictionary<string, int> _uniforms = new();
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public Shader(string vertexPath, string fragmentPath)
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{
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int vertex = Shader.CompileFromFile(ShaderType.VertexShader, vertexPath);
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int fragment = Shader.CompileFromFile(ShaderType.FragmentShader, fragmentPath);
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this._handle = GL.CreateProgram();
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GL.AttachShader(this._handle, vertex);
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GL.AttachShader(this._handle, fragment);
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GL.LinkProgram(this._handle);
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GL.GetProgram(this._handle, GetProgramParameterName.LinkStatus, out int linked);
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if (linked == 0)
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throw new InvalidOperationException($"Program link failed: {GL.GetProgramInfoLog(this._handle)}");
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GL.DetachShader(this._handle, vertex);
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GL.DetachShader(this._handle, fragment);
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GL.DeleteShader(vertex);
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GL.DeleteShader(fragment);
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}
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public void Use() => GL.UseProgram(this._handle);
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public void SetMatrix4(string name, Matrix4 value) =>
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GL.UniformMatrix4(this.Location(name), true, ref value);
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public void SetInt(string name, int value) =>
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GL.Uniform1(this.Location(name), value);
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public void SetFloat(string name, float value) =>
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GL.Uniform1(this.Location(name), value);
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private int Location(string name)
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{
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if (this._uniforms.TryGetValue(name, out int location)) return location;
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location = GL.GetUniformLocation(this._handle, name);
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this._uniforms[name] = location;
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return location;
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}
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private static int CompileFromFile(ShaderType type, string path)
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{
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string source = File.ReadAllText(path);
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int shader = GL.CreateShader(type);
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GL.ShaderSource(shader, source);
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GL.CompileShader(shader);
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GL.GetShader(shader, ShaderParameter.CompileStatus, out int compiled);
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if (compiled == 0)
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throw new InvalidOperationException($"{type} compile failed ({path}): {GL.GetShaderInfoLog(shader)}");
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return shader;
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}
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public void Dispose() => GL.DeleteProgram(this._handle);
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}
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