public static uint LoadShaderProgram(
IOpenGl gl,
ReadOnlySpan <byte> vertexSource,
ReadOnlySpan <byte> fragmentSource)
{
var vertexShader = LoadShader(gl, vertexSource, Gl.VertexShader);
try
{
var fragmentShader = LoadShader(gl, fragmentSource, Gl.FragmentShader);
try
{
var program = gl.CreateProgram();
gl.AttachShader(program, vertexShader);
gl.AttachShader(program, fragmentShader);
gl.LinkProgram(program);
gl.DeleteShader(fragmentShader);
gl.DeleteShader(vertexShader);
gl.GetProgramiv(program, Gl.LinkStatus, out var result);
if (result == Gl.False)
{
gl.GetProgramiv(program, Gl.InfoLogLength, out var logLength);
var buffer = new byte[logLength];
gl.GetProgramInfoLog(program, buffer.Length, out _, buffer);
var errors = Encoding.UTF8.GetString(buffer);
throw new OpenGlException("Error linking program: " + errors);
}
return(program);
}
finally
{
gl.DeleteShader(fragmentShader);
}
}
finally
{
gl.DeleteShader(vertexShader);
}
}
public static uint LoadShader(
IOpenGl gl,
ReadOnlySpan <byte> source,
uint shaderType)
{
unsafe
{
fixed(byte *pointer = source)
{
var shader = gl.CreateShader(shaderType);
try
{
var ptr = new IntPtr(pointer);
gl.ShaderSource(shader, 1, ptr, source.Length);
gl.CompileShader(shader);
gl.GetShaderiv(shader, Gl.CompileStatus, out var result);
if (result == Gl.False)
{
gl.GetShaderiv(shader, Gl.InfoLogLength, out var logLength);
var buffer = new byte[logLength];
gl.GetShaderInfoLog(shader, buffer.Length, out var actualLength, buffer);
// We can disregard the actual length because we queried the actual length up above.
var errors = Encoding.UTF8.GetString(buffer);
throw new OpenGlException("Error compiling shader: " + errors);
}
return(shader);
}
catch
{
gl.DeleteShader(shader);
throw;
}
}
}
}
