public void DrawPrimitives(PrimitiveType primitiveType, int vertexStart, int primitiveCount)
{
// Flush the GL state before moving on!
ApplyState();
// Set up the vertex buffers.
for (int i = 0; i < vertexBufferCount; i += 1)
{
GLDevice.BindVertexBuffer(
vertexBufferBindings[i].VertexBuffer.Handle
);
vertexBufferBindings[i].VertexBuffer.VertexDeclaration.Apply(
VertexShader,
(IntPtr)(
vertexBufferBindings[i].VertexBuffer.VertexDeclaration.VertexStride *
vertexBufferBindings[i].VertexOffset
)
);
}
// Enable the appropriate vertex attributes.
GLDevice.FlushGLVertexAttributes();
// Draw!
GLDevice.glDrawArrays(
PrimitiveTypeGL(primitiveType),
vertexStart,
GetElementCountArray(primitiveType, primitiveCount)
);
}
public void DrawUserPrimitives <T>(
PrimitiveType primitiveType,
T[] vertexData,
int vertexOffset,
int primitiveCount,
VertexDeclaration vertexDeclaration
) where T : struct
{
// Flush the GL state before moving on!
ApplyState();
// Unbind current VBOs.
GLDevice.BindVertexBuffer(OpenGLDevice.OpenGLVertexBuffer.NullBuffer);
// Pin the buffers.
GCHandle vbHandle = GCHandle.Alloc(vertexData, GCHandleType.Pinned);
// Setup the vertex declaration to point at the VB data.
vertexDeclaration.GraphicsDevice = this;
vertexDeclaration.Apply(VertexShader, vbHandle.AddrOfPinnedObject());
// Enable the appropriate vertex attributes.
GLDevice.FlushGLVertexAttributes();
// Draw!
GLDevice.glDrawArrays(
PrimitiveTypeGL(primitiveType),
vertexOffset,
GetElementCountArray(primitiveType, primitiveCount)
);
// Release the handles.
vbHandle.Free();
}