private void CreateVertexArray(Context context)
{
// TODO: Buffer hint.
_positionBuffer = Device.CreateVertexBuffer(BufferHint.StaticDraw, SizeInBytes<Vector2F>.Value);
VertexBufferAttribute positionAttribute = new VertexBufferAttribute(
_positionBuffer, ComponentDatatype.Float, 2);
_drawState.VertexArray = context.CreateVertexArray();
_drawState.VertexArray.Attributes[_drawState.ShaderProgram.VertexAttributes["position"].Location] = positionAttribute;
}
public void VertexArray()
{
Vector3F[] positions = new Vector3F[]
{
new Vector3F(0, 0, 0),
new Vector3F(1, 0, 0),
new Vector3F(0, 1, 0)
};
int vbSizeInBytes = ArraySizeInBytes.Size(positions);
uint[] indices = new uint[] { 0, 1, 2 };
int ibSizeInBytes = indices.Length * sizeof(uint);
using (GraphicsWindow window = Device.CreateWindow(1, 1))
using (VertexBuffer vertexBuffer = Device.CreateVertexBuffer(BufferHint.StaticDraw, vbSizeInBytes))
using (IndexBuffer indexBuffer = Device.CreateIndexBuffer(BufferHint.StreamDraw, ibSizeInBytes))
using (VertexArray va = window.Context.CreateVertexArray())
{
vertexBuffer.CopyFromSystemMemory(positions);
indexBuffer.CopyFromSystemMemory(indices);
//
// Create and verify vertex buffer attribute
//
VertexBufferAttribute vertexBufferAttribute = new VertexBufferAttribute(
vertexBuffer, ComponentDatatype.Float, 3, false, 0, 0);
Assert.AreEqual(vertexBuffer, vertexBufferAttribute.VertexBuffer);
Assert.AreEqual(ComponentDatatype.Float, vertexBufferAttribute.ComponentDatatype);
Assert.AreEqual(3, vertexBufferAttribute.NumberOfComponents);
Assert.IsFalse(vertexBufferAttribute.Normalize);
Assert.AreEqual(0, vertexBufferAttribute.OffsetInBytes);
Assert.AreEqual(SizeInBytes<Vector3F>.Value, vertexBufferAttribute.StrideInBytes);
//
// Verify vertex array
//
va.Attributes[0] = vertexBufferAttribute;
va.IndexBuffer = indexBuffer;
Assert.AreEqual(vertexBufferAttribute, va.Attributes[0]);
Assert.AreEqual(indexBuffer, va.IndexBuffer);
va.Attributes[0] = null;
va.IndexBuffer = null;
Assert.IsNull(va.Attributes[0]);
Assert.IsNull(va.IndexBuffer);
}
}
public void VertexArray()
{
Vector3F[] positions = new Vector3F[]
{
new Vector3F(0, 0, 0),
new Vector3F(1, 0, 0),
new Vector3F(0, 1, 0)
};
int vbSizeInBytes = ArraySizeInBytes.Size(positions);
uint[] indices = new uint[] { 0, 1, 2 };
int ibSizeInBytes = indices.Length * sizeof(uint);
using (GraphicsWindow window = Device.CreateWindow(1, 1))
using (VertexBuffer vertexBuffer = Device.CreateVertexBuffer(BufferHint.StaticDraw, vbSizeInBytes))
using (IndexBuffer indexBuffer = Device.CreateIndexBuffer(BufferHint.StreamDraw, ibSizeInBytes))
using (VertexArray va = window.Context.CreateVertexArray())
{
vertexBuffer.CopyFromSystemMemory(positions);
indexBuffer.CopyFromSystemMemory(indices);
//
// Create and verify vertex buffer attribute
//
VertexBufferAttribute vertexBufferAttribute = new VertexBufferAttribute(
vertexBuffer, ComponentDatatype.Float, 3, false, 0, 0);
Assert.AreEqual(vertexBuffer, vertexBufferAttribute.VertexBuffer);
Assert.AreEqual(ComponentDatatype.Float, vertexBufferAttribute.ComponentDatatype);
Assert.AreEqual(3, vertexBufferAttribute.NumberOfComponents);
Assert.IsFalse(vertexBufferAttribute.Normalize);
Assert.AreEqual(0, vertexBufferAttribute.OffsetInBytes);
Assert.AreEqual(SizeInBytes <Vector3F> .Value, vertexBufferAttribute.StrideInBytes);
//
// Verify vertex array
//
va.Attributes[0] = vertexBufferAttribute;
va.IndexBuffer = indexBuffer;
Assert.AreEqual(vertexBufferAttribute, va.Attributes[0]);
Assert.AreEqual(indexBuffer, va.IndexBuffer);
va.Attributes[0] = null;
va.IndexBuffer = null;
Assert.IsNull(va.Attributes[0]);
Assert.IsNull(va.IndexBuffer);
}
}
internal void Update(Context context, ShaderProgram sp)
{
if (_va == null)
{
VertexBufferAttribute positionAttribute = new VertexBufferAttribute(
_positionBuffer, ComponentDatatype.Float, 2);
VertexBufferAttribute textureCoordinatesAttribute = new VertexBufferAttribute(
_textureCoordinatesBuffer, ComponentDatatype.HalfFloat, 2);
_va = context.CreateVertexArray();
_va.Attributes[sp.VertexAttributes["position"].Location] = positionAttribute;
_va.Attributes[sp.VertexAttributes["textureCoordinates"].Location] = textureCoordinatesAttribute;
}
if (_viewport != context.Viewport)
{
//
// Bottom and top swapped: MS -> OpenGL
//
float left = context.Viewport.Left;
float bottom = context.Viewport.Top;
float right = context.Viewport.Right;
float top = context.Viewport.Bottom;
Vector2F[] positions = new Vector2F[]
{
new Vector2F(left, bottom),
new Vector2F(right, bottom),
new Vector2F(left, top),
new Vector2F(right, top)
};
_positionBuffer.CopyFromSystemMemory(positions);
Vector2H[] textureCoordinates = new Vector2H[]
{
new Vector2H(0, 0),
new Vector2H(1, 0),
new Vector2H(0, 1),
new Vector2H(1, 1)
};
_textureCoordinatesBuffer.CopyFromSystemMemory(textureCoordinates);
_viewport = context.Viewport;
}
}
public MeshVertexBufferAttributes()
{
_attributes = new VertexBufferAttribute[Device.MaximumNumberOfVertexAttributes];
}
private static int NumberOfVertices(VertexBufferAttribute attribute)
{
return attribute.VertexBuffer.SizeInBytes / attribute.StrideInBytes;
}
public MeshVertexBufferAttributes()
{
_attributes = new VertexBufferAttribute[Device.MaximumNumberOfVertexAttributes];
}