/// <summary>
/// Prepare VBO content and upload it to the GPU.
/// </summary>
private void PrepareDataBuffers()
{
if (useVBO &&
scene != null &&
scene.Triangles > 0)
{
GL.EnableClientState(ArrayCap.VertexArray);
if (scene.HasNormals())
{
GL.EnableClientState(ArrayCap.NormalArray);
}
if (scene.HasColors())
{
GL.EnableClientState(ArrayCap.ColorArray);
}
// Vertex array: [color] [normal] coord
GL.BindBuffer(BufferTarget.ArrayBuffer, VBOid[0]);
int vertexBufferSize = scene.VertexBufferSize(true, false, true, true);
GL.BufferData(BufferTarget.ArrayBuffer, (IntPtr)vertexBufferSize, IntPtr.Zero, BufferUsageHint.StaticDraw);
IntPtr videoMemoryPtr = GL.MapBuffer(BufferTarget.ArrayBuffer, BufferAccess.WriteOnly);
unsafe
{
stride = scene.FillVertexBuffer((float *)videoMemoryPtr.ToPointer(), true, false, true, true);
}
GL.UnmapBuffer(BufferTarget.ArrayBuffer);
GL.BindBuffer(BufferTarget.ArrayBuffer, 0);
// Index buffer
GL.BindBuffer(BufferTarget.ElementArrayBuffer, VBOid[1]);
GL.BufferData(BufferTarget.ElementArrayBuffer, (IntPtr)(scene.Triangles * 3 * sizeof(uint)), IntPtr.Zero, BufferUsageHint.StaticDraw);
videoMemoryPtr = GL.MapBuffer(BufferTarget.ElementArrayBuffer, BufferAccess.WriteOnly);
unsafe
{
scene.FillIndexBuffer((uint *)videoMemoryPtr.ToPointer());
}
GL.UnmapBuffer(BufferTarget.ElementArrayBuffer);
GL.BindBuffer(BufferTarget.ElementArrayBuffer, 0);
}
else
{
GL.DisableClientState(ArrayCap.VertexArray);
GL.DisableClientState(ArrayCap.NormalArray);
GL.DisableClientState(ArrayCap.ColorArray);
if (useVBO)
{
GL.BindBuffer(BufferTarget.ArrayBuffer, VBOid[0]);
GL.BufferData(BufferTarget.ArrayBuffer, (IntPtr)0, IntPtr.Zero, BufferUsageHint.StaticDraw);
GL.BindBuffer(BufferTarget.ArrayBuffer, 0);
GL.BindBuffer(BufferTarget.ElementArrayBuffer, VBOid[1]);
GL.BufferData(BufferTarget.ElementArrayBuffer, (IntPtr)0, IntPtr.Zero, BufferUsageHint.StaticDraw);
GL.BindBuffer(BufferTarget.ElementArrayBuffer, 0);
}
}
}
private void RenderScene(SceneBrep scene)
{
if (scene != null && scene.Triangles > 0)
{
if (scene.HasNormals() && scene.Normals > 0)
{
GL.Begin(PrimitiveType.Triangles);
for (int i = 0; i < scene.Triangles; ++i)
{
int v1, v2, v3;
scene.GetTriangleVertices(i, out v1, out v2, out v3);
GL.Normal3(scene.GetNormal(v1));
GL.Vertex3(scene.GetVertex(v1));
GL.Normal3(scene.GetNormal(v2));
GL.Vertex3(scene.GetVertex(v2));
GL.Normal3(scene.GetNormal(v3));
GL.Vertex3(scene.GetVertex(v3));
}
GL.End();
}
else
{
GL.End();
GL.Begin(PrimitiveType.Triangles);
for (int i = 0; i < scene.Triangles; ++i)
{
Vector3 v1, v2, v3;
scene.GetTriangleVertices(i, out v1, out v2, out v3);
GL.Vertex3(v1);
GL.Vertex3(v2);
GL.Vertex3(v3);
}
GL.End();
}
}
else // color cube (JB)
{
GL.Begin(PrimitiveType.Quads);
GL.Color3(0.0f, 1.0f, 0.0f); // Set The Color To Green
GL.Vertex3(1.0f, 1.0f, -1.0f); // Top Right Of The Quad (Top)
GL.Vertex3(-1.0f, 1.0f, -1.0f); // Top Left Of The Quad (Top)
GL.Vertex3(-1.0f, 1.0f, 1.0f); // Bottom Left Of The Quad (Top)
GL.Vertex3(1.0f, 1.0f, 1.0f); // Bottom Right Of The Quad (Top)
GL.Color3(1.0f, 0.5f, 0.0f); // Set The Color To Orange
GL.Vertex3(1.0f, -1.0f, 1.0f); // Top Right Of The Quad (Bottom)
GL.Vertex3(-1.0f, -1.0f, 1.0f); // Top Left Of The Quad (Bottom)
GL.Vertex3(-1.0f, -1.0f, -1.0f); // Bottom Left Of The Quad (Bottom)
GL.Vertex3(1.0f, -1.0f, -1.0f); // Bottom Right Of The Quad (Bottom)
GL.Color3(1.0f, 0.0f, 0.0f); // Set The Color To Red
GL.Vertex3(1.0f, 1.0f, 1.0f); // Top Right Of The Quad (Front)
GL.Vertex3(-1.0f, 1.0f, 1.0f); // Top Left Of The Quad (Front)
GL.Vertex3(-1.0f, -1.0f, 1.0f); // Bottom Left Of The Quad (Front)
GL.Vertex3(1.0f, -1.0f, 1.0f); // Bottom Right Of The Quad (Front)
GL.Color3(1.0f, 1.0f, 0.0f); // Set The Color To Yellow
GL.Vertex3(1.0f, -1.0f, -1.0f); // Bottom Left Of The Quad (Back)
GL.Vertex3(-1.0f, -1.0f, -1.0f); // Bottom Right Of The Quad (Back)
GL.Vertex3(-1.0f, 1.0f, -1.0f); // Top Right Of The Quad (Back)
GL.Vertex3(1.0f, 1.0f, -1.0f); // Top Left Of The Quad (Back)
GL.Color3(0.0f, 0.0f, 1.0f); // Set The Color To Blue
GL.Vertex3(-1.0f, 1.0f, 1.0f); // Top Right Of The Quad (Left)
GL.Vertex3(-1.0f, 1.0f, -1.0f); // Top Left Of The Quad (Left)
GL.Vertex3(-1.0f, -1.0f, -1.0f); // Bottom Left Of The Quad (Left)
GL.Vertex3(-1.0f, -1.0f, 1.0f); // Bottom Right Of The Quad (Left)
GL.Color3(1.0f, 0.0f, 1.0f); // Set The Color To Violet
GL.Vertex3(1.0f, 1.0f, -1.0f); // Top Right Of The Quad (Right)
GL.Vertex3(1.0f, 1.0f, 1.0f); // Top Left Of The Quad (Right)
GL.Vertex3(1.0f, -1.0f, 1.0f); // Bottom Left Of The Quad (Right)
GL.Vertex3(1.0f, -1.0f, -1.0f); // Bottom Right Of The Quad (Right)
GL.End();
}
}
