public GlVertexArray(GlProgram program, float[] positions, float[] colors)
{
if (program == null)
{
throw new ArgumentNullException(nameof(program));
}
// Allocate buffers referenced by this vertex array
_BufferPosition = new GlBuffer(positions);
_BufferColor = new GlBuffer(colors);
// Generate VAO name
ArrayName = Gl.GenVertexArray();
// First bind create the VAO
Gl.BindVertexArray(ArrayName);
// Set position attribute
// Select the buffer object
Gl.BindBuffer(BufferTarget.ArrayBuffer, _BufferPosition.BufferName);
// Format the vertex information: 2 floats from the current buffer
Gl.VertexAttribPointer((uint)program.LocationPosition, 3, VertexAttribType.Float, false, 0, IntPtr.Zero);
// Enable attribute
Gl.EnableVertexAttribArray((uint)program.LocationPosition);
// As above, but for color attribute
Gl.BindBuffer(BufferTarget.ArrayBuffer, _BufferColor.BufferName);
Gl.VertexAttribPointer((uint)program.LocationColor, 3, VertexAttribType.Float, false, 0, IntPtr.Zero);
Gl.EnableVertexAttribArray((uint)program.LocationColor);
}
internal static GlVertexArray FromVertexPool(GlProgram program, VertexPool vertexPool)
{
var pos = new float[vertexPool.Size * 3];
var col = new float[vertexPool.Size * 3];
for (int i = 0; i < vertexPool.Size; i++)
{
pos[i * 3 + 0] = vertexPool[i].position.x;
pos[i * 3 + 1] = vertexPool[i].position.y;
pos[i * 3 + 2] = vertexPool[i].position.z;
col[i * 3 + 0] = col[i * 3 + 1] = col[i * 3 + 2] = 1.0f;
}
return(new GlVertexArray(program, pos, col));
}
