public void AddVertexBufferWithNullLayout()
{
IVertexArray vertexArray = new OpenGLVertexArray();
IVertexBuffer vertexBuffer = new OpenGLVertexBuffer(new float[0]);
Assert.Throws <ArgumentNullException>(() =>
vertexArray.Add(vertexBuffer));
}
public void AddVertexBuffer(int count)
{
IVertexArray vertexArray = new OpenGLVertexArray();
for (int i = 0; i < count; i++)
{
IVertexBuffer vertexBuffer = new OpenGLVertexBuffer(new float[] { 0, 0 })
{
Layout = new OpenGLBufferLayout(
new BufferElement(ShaderDataType.Float2, "TestsBuffer")
)
};
vertexArray.Add(vertexBuffer);
}
Assert.NotNull(vertexArray.VertexBuffers);
Assert.Equal(count, vertexArray.VertexBuffers.Count());
}
/// <summary>
/// Binds the specified buffer's vertex attributes to the currently cached program.
/// </summary>
private void BindVertexAttributesForBuffer(OpenGLVertexBuffer vbuffer, Int32 instanceFrequency)
{
gl.BindBuffer(gl.GL_ARRAY_BUFFER, vbuffer.OpenGLName);
gl.ThrowIfError();
var position = 0u;
foreach (var element in vbuffer.VertexDeclaration)
{
var name = GetVertexAttributeNameFromUsage(element.Usage, element.Index);
var size = 0;
var stride = 0;
var normalize = false;
var integer = false;
var type = GetVertexFormatGL(element.Format, out size, out stride, out normalize, out integer);
var location = gl.GetAttribLocation(program, name);
if (location >= 0)
{
gl.VertexAttribDivisor((uint)location, (uint)instanceFrequency);
gl.ThrowIfError();
unsafe
{
if (integer && !gl.IsGLES2)
{
gl.VertexAttribIPointer((uint)location, size, type, vbuffer.VertexDeclaration.VertexStride, (void*)(position));
gl.ThrowIfError();
}
else
{
gl.VertexAttribPointer((uint)location, size, type, normalize, vbuffer.VertexDeclaration.VertexStride, (void*)(position));
gl.ThrowIfError();
}
}
gl.EnableVertexAttribArray((uint)location);
gl.ThrowIfError();
}
position += (uint)stride;
}
}
/// <summary>
/// Initializes a new instance of the <see cref="VertexBufferBinding"/> structure.
/// </summary>
/// <param name="vbuffer">The vertex buffer which is bound to the geometry stream.</param>
/// <param name="instanceFrequency">The number of instances which are drawn for each
/// set of data in the vertex buffer.</param>
public VertexBufferBinding(OpenGLVertexBuffer vbuffer, Int32 instanceFrequency)
{
this.VertexBuffer = vbuffer;
this.InstanceFrequency = instanceFrequency;
}
/// <summary>
/// Binds the specified buffer's vertex attributes to the currently cached program.
/// </summary>
/// <param name="vbuffer">The vertex buffer to bind to the cached program.</param>
private void BindVertexAttributesForBuffer(OpenGLVertexBuffer vbuffer)
{
gl.BindBuffer(gl.GL_ARRAY_BUFFER, vbuffer.OpenGLName);
gl.ThrowIfError();
var position = 0u;
foreach (var element in vbuffer.VertexDeclaration)
{
var name = GetVertexAttributeNameFromUsage(element.Usage, element.Index);
var size = 0;
var stride = 0;
var type = GetVertexFormatGL(element.Format, out size, out stride);
var location = gl.GetAttribLocation(program, name);
if (location >= 0)
{
unsafe
{
gl.VertexAttribPointer((uint)location, size, type, true, vbuffer.VertexDeclaration.VertexStride, (void*)(position));
gl.ThrowIfError();
}
gl.EnableVertexAttribArray((uint)location);
gl.ThrowIfError();
}
position += (uint)stride;
}
}
