public RenderEngine()
{
// check if VBO are supported
string vboCoreStr = "GL_vertex_buffer_object";
string vboARBStr = "GL_ARB_vertex_buffer_object";
_vbotype = VBOType.No;
string exts = GL.GetString(StringName.Extensions);
if (exts.Contains(vboCoreStr))
{
_vbotype = VBOType.Core;
} else if (exts.Contains(vboARBStr))
{
_vbotype = VBOType.ARB;
}
}
public IndexBuffer(VBOType vbo, int numIndicies, BufferUsage usage, DrawMode dmode)
{
_vbo = -1;
_useVbo = vbo;
_usage = usage;
_indicies = null;
_idxNum = numIndicies;
_dmode = dmode;
int sizeInBytes = Marshal.SizeOf(typeof(ushort)) * numIndicies;
if (_useVbo == VBOType.Core) {
BufferUsageHint buh = BufferUsageHint.StaticDraw;
if (_usage == BufferUsage.DYNAMIC)
buh = BufferUsageHint.DynamicDraw;
GL.GenBuffers (1, out _vbo);
GL.BindBuffer (BufferTarget.ElementArrayBuffer, _vbo);
GL.BufferData (BufferTarget.ElementArrayBuffer, new IntPtr (sizeInBytes), IntPtr.Zero, buh);
} else if (_useVbo == VBOType.ARB) {
BufferUsageArb buh = BufferUsageArb.StaticDraw;
if (_usage == BufferUsage.DYNAMIC)
buh = BufferUsageArb.DynamicDraw;
GL.Arb.GenBuffers (1, out _vbo);
GL.Arb.BindBuffer (BufferTargetArb.ElementArrayBuffer, _vbo);
GL.Arb.BufferData (BufferTargetArb.ElementArrayBuffer, new IntPtr (sizeInBytes), IntPtr.Zero, buh);
} else {
_vbo = _gSWIBuffer++;
_indicies = new ushort[numIndicies];
}
}
public VertexBuffer(VBOType vbo, int numVertices, BufferUsage usage)
{
_vbo = -1;
_useVbo = vbo;
_usage = usage;
_vertices = null;
_vertsNum = numVertices;
int sizeInBytes = Marshal.SizeOf (typeof(Vertex)) * numVertices;
if (_useVbo == VBOType.Core) {
BufferUsageHint buh = BufferUsageHint.StaticDraw;
if (_usage == BufferUsage.DYNAMIC)
buh = BufferUsageHint.DynamicDraw;
GL.GenBuffers (1, out _vbo);
GL.BindBuffer (BufferTarget.ArrayBuffer, _vbo);
GL.BufferData (BufferTarget.ArrayBuffer, new IntPtr (sizeInBytes), IntPtr.Zero, buh);
} else if (_useVbo == VBOType.ARB) {
BufferUsageArb buh = BufferUsageArb.StaticDraw;
if (_usage == BufferUsage.DYNAMIC)
buh = BufferUsageArb.DynamicDraw;
GL.Arb.GenBuffers (1, out _vbo);
GL.Arb.BindBuffer (BufferTargetArb.ArrayBuffer, _vbo);
GL.Arb.BufferData (BufferTargetArb.ArrayBuffer, new IntPtr (sizeInBytes), IntPtr.Zero, buh);
} else {
_vbo = _gSWVBuffer++;
_vertices = new Vertex[numVertices];
}
}