/// <summary>
/// Compiles a VertexShader and FragmentShader to a usable shader program.
/// </summary>
/// <param name="VS">The input VertexShader code.</param>
/// <param name="FS">The input FragmentShader code.</param>
/// <param name="vars">All variables to include.</param>
/// <param name="geom">The input GeometryShader code, if any.</param>
/// <returns>The internal OpenGL program ID.</returns>
public int CompileToProgram(string VS, string FS, string[] vars, string geom)
{
for (int i = 0; i < vars.Length; i++)
{
if (vars[i].Length > 0)
{
VS = VS.Replace("#define " + vars[i] + " 0", "#define " + vars[i] + " 1");
FS = FS.Replace("#define " + vars[i] + " 0", "#define " + vars[i] + " 1");
if (geom != null)
{
geom = geom.Replace("#define " + vars[i] + " 0", "#define " + vars[i] + " 1");
}
}
}
int gObj = -1;
VS = Includes(VS);
FS = Includes(FS);
if (geom != null)
{
geom = Includes(geom);
gObj = GL.CreateShader(ShaderType.GeometryShader);
GL.ShaderSource(gObj, geom);
GL.CompileShader(gObj);
string GS_Info = GL.GetShaderInfoLog(gObj);
GL.GetShader(gObj, ShaderParameter.CompileStatus, out int GS_Status);
if (GS_Status != 1)
{
throw new Exception("Error creating GeometryShader. Error status: " + GS_Status + ", info: " + GS_Info);
}
}
int VertexObject = GL.CreateShader(ShaderType.VertexShader);
GL.ShaderSource(VertexObject, VS);
GL.CompileShader(VertexObject);
string VS_Info = GL.GetShaderInfoLog(VertexObject);
GL.GetShader(VertexObject, ShaderParameter.CompileStatus, out int VS_Status);
if (VS_Status != 1)
{
throw new Exception("Error creating VertexShader. Error status: " + VS_Status + ", info: " + VS_Info);
}
int FragmentObject = GL.CreateShader(ShaderType.FragmentShader);
GL.ShaderSource(FragmentObject, FS);
GL.CompileShader(FragmentObject);
string FS_Info = GL.GetShaderInfoLog(FragmentObject);
GL.GetShader(FragmentObject, ShaderParameter.CompileStatus, out int FS_Status);
if (FS_Status != 1)
{
throw new Exception("Error creating FragmentShader. Error status: " + FS_Status + ", info: " + FS_Info);
}
int Program = GL.CreateProgram();
GL.AttachShader(Program, FragmentObject);
GL.AttachShader(Program, VertexObject);
if (geom != null)
{
GL.AttachShader(Program, gObj);
}
GL.LinkProgram(Program);
string str = GL.GetProgramInfoLog(Program);
if (str.Length != 0)
{
SysConsole.Output(OutputType.INFO, "Linked shader with message: '" + str + "'" + " -- FOR: variables: " + string.Join(",", vars));
}
GL.DeleteShader(FragmentObject);
GL.DeleteShader(VertexObject);
if (geom != null)
{
GL.DeleteShader(gObj);
}
GraphicsUtil.CheckError("Shader - Compile");
return(Program);
}