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using Silk.NET.OpenGL;
namespace Godosa.Desktop;
/// <summary>Shader program helpers: compile + link with the driver's info log in the
/// exception, so a bad shader fails loudly at startup instead of drawing nothing.</summary>
public static class GlProgram
{
public static uint Link(GL gl, string vertexSource, string fragmentSource)
{
uint vs = Compile(gl, ShaderType.VertexShader, vertexSource);
uint fs = Compile(gl, ShaderType.FragmentShader, fragmentSource);
uint program = gl.CreateProgram();
gl.AttachShader(program, vs);
gl.AttachShader(program, fs);
gl.LinkProgram(program);
gl.GetProgram(program, ProgramPropertyARB.LinkStatus, out int linkStatus);
if (linkStatus == 0)
throw new InvalidOperationException($"Shader link failed: {gl.GetProgramInfoLog(program)}");
gl.DeleteShader(vs);
gl.DeleteShader(fs);
return program;
}
public static uint Compile(GL gl, ShaderType type, string source)
{
uint shader = gl.CreateShader(type);
gl.ShaderSource(shader, source);
gl.CompileShader(shader);
gl.GetShader(shader, ShaderParameterName.CompileStatus, out int status);
if (status == 0)
throw new InvalidOperationException($"Shader compile failed: {gl.GetShaderInfoLog(shader)}");
return shader;
}
}
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