public void SetUniform(String name, params int[] values)
{
if (ShaderID <= 0)
{
throw new RenderingException("Can't set uniforms in an invalid program!");
}
if (!ShaderCompiled)
{
throw new RenderingException("Can't set uniforms in a not-yet-compiled program!");
}
if (values.Length <= 0)
{
return;
}
if (values.Length > 4)
{
throw new RenderingException("Uniform size larger than 4 is not supported.");
}
int prog = GL.GetInteger(GetPName.CurrentProgram);
GL.UseProgram(ShaderID);
try
{
int uloc = GL.GetUniformLocation(ShaderID, name);
if (uloc < 0)
{
throw new RenderingException("Nonexistent uniform name.");
}
switch (values.Length)
{
case 1:
GL.Uniform1(uloc, values[0]);
break;
case 2:
GL.Uniform2(uloc, values[0], values[1]);
break;
case 3:
GL.Uniform3(uloc, values[0], values[1], values[2]);
break;
case 4:
GL.Uniform4(uloc, values[0], values[1], values[2], values[3]);
break;
}
RenderingException.FromGLError();
}
finally
{
GL.UseProgram(prog);
}
}
public void Update()
{
if ((VBOSize == Vertices.Count) && (Vertices.Count <= 0))
{
return;
}
GL.PushClientAttrib(ClientAttribMask.ClientVertexArrayBit);
try
{
GL.BindBuffer(BufferTarget.ElementArrayBuffer, VBOID);
if (VBOSize != Vertices.Count) // need to create new buffer
{
unsafe
{
Vertex[] Mem = Vertices.ToArray();
fixed(Vertex *MemPtr = Mem)
{
GL.BufferData(BufferTarget.ElementArrayBuffer, (IntPtr)(Vertices.Count * Vertex.StructSize), (IntPtr)MemPtr, BufferUsageHint.StreamCopy);
}
}
RenderingException.FromGLError();
VBOSize = Vertices.Count;
}
else // size matches, just update the items (no need to create new buffer)
{
IntPtr VMemIntPtr = GL.MapBuffer(BufferTarget.ArrayBuffer, BufferAccess.WriteOnly);
RenderingException.FromGLError();
unsafe
{
Vertex *VMemPtr = (Vertex *)VMemIntPtr.ToPointer();
for (int i = 0; i < Vertices.Count; i++)
{
(*(VMemPtr + i)) = Vertices[i];
}
}
GL.UnmapBuffer(BufferTarget.ArrayBuffer);
}
}
finally
{
GL.PopClientAttrib();
}
}
public void AddShader(ShaderType type, String code)
{
if (ShaderID <= 0)
{
throw new RenderingException("Can't add shaders to an invalid program!");
}
if (ShaderCompiled)
{
throw new RenderingException("Can't add shaders to an already compiled program!");
}
int shader = GL.CreateShader(type);
try
{
if (shader <= 0)
{
throw new RenderingException("Unable to generate Shader Object.");
}
GL.ShaderSource(shader, code);
GL.CompileShader(shader);
int shader_status;
GL.GetShader(shader, ShaderParameter.CompileStatus, out shader_status);
if (shader_status != 1)
{
String shader_infolog = GL.GetShaderInfoLog(shader);
String msg = "Unable to compile shader:" + Environment.NewLine + shader_infolog;
throw new RenderingException(msg);
}
GL.AttachShader(ShaderID, shader);
}
finally
{
if (shader > 0)
{
GL.DeleteShader(shader);
}
}
RenderingException.FromGLError();
}