public void SetUp()
{
position = Vector2.Zero;
colour = Vector4.Zero;
textureCoordinate = Vector2.Zero;
vertex = new VertexPositionColourTexture(
position,
colour,
textureCoordinate
);
}
public void TypeEquals_ReturnsTrue_OnEqualVertex(VertexPositionColourTexture other)
{
vertex.Equals(other).ShouldBeTrue();
}
public void TypeEquals_ReturnsFalse_OnUnequalVertices(VertexPositionColourTexture other)
{
vertex.Equals(other).ShouldBeFalse();
}
public void NotEqualsOperator_ReturnsFalse_OnEqualVertex(VertexPositionColourTexture other)
{
(vertex != other).ShouldBeFalse();
}
public void GetHashCode_IsNotEqual_ForUnequalVertices(VertexPositionColourTexture other)
{
vertex.GetHashCode().ShouldNotBe(other.GetHashCode());
}
public void NotEqualsOperator_ReturnsTrue_OnUnequalVertices(VertexPositionColourTexture other)
{
(vertex != other).ShouldBeTrue();
}
public void EqualsOperator_ReturnsFalse_OnUnequalVertices(VertexPositionColourTexture other)
{
(vertex == other).ShouldBeFalse();
}
public void EqualsOperator_ReturnsTrue_OnEqualVertex(VertexPositionColourTexture other)
{
(vertex == other).ShouldBeTrue();
}
public void Remove_ClearsSpriteVerticesFromVbo_OnSpriteRemoval()
{
var sprite = new Sprite(spriteSheet.Object.GetRegion(0), 10, 10);
var spriteSize = Sprite.VertexCount * declaration.Stride;
spriteBatch.Add(sprite);
var spriteVboSize = new IntPtr(spriteSize);
var spriteVboOffset = new IntPtr(spriteSize * sprite.BatchIndex);
// essentially, overwrite the vertex data in the vbo with 4 vertices
// that have no alpha and are hence transparent.
var emptyVertex = default(VertexPositionColourTexture);
var emptyVertices = new VertexPositionColourTexture[]
{
emptyVertex,
emptyVertex,
emptyVertex,
emptyVertex
};
spriteBatch.Remove(sprite);
vbo.Verify(v => v.Bind());
vbo.Verify(v => v.FillPartial(spriteVboOffset, spriteVboSize, emptyVertices));
}
public void Add_PreparesSpriteVertices_OnSuccessfulAdd()
{
var sprite = new Sprite(spriteSheet.Object.GetRegion(0), 10, 10);
spriteBatch.Add(sprite);
/* The sprite batch should take the sprite's texture region
* and scale each corner according to the whole texture atlas width/height
* so that they fall in the range 0-1 (to match the expectations of OpenGL) */
float scaledWidth = 1.0f / spriteSheet.Object.Texture.Width;
float scaledHeight = 1.0f / spriteSheet.Object.Texture.Height;
var region = sprite.TextureRegion;
// texture packer x,y refer to bottom left position of the texture region
// whereas, OpenGL coordinate system has (0,0) at the upper-left
var topLeftCoord = new Vector2(region.X * scaledWidth, (region.Y + region.Height) * scaledHeight);
var topRightCoord = new Vector2((region.X + region.Width) * scaledWidth, (region.Y + region.Height) * scaledHeight);
var bottomRightCoord = new Vector2((region.X + region.Width) * scaledWidth, region.Y * scaledHeight);
var bottomLeftCoord = new Vector2(region.X * scaledWidth, region.Y * scaledHeight);
// we should also scale the sprite's colour to fall in the range 0-1
var sColour = sprite.Colour;
var scaledColour = new Vector4(sColour.R / 255, sColour.G / 255, sColour.B / 255, sColour.A / 255);
// expected vertex positions
var topLeftPosition = new Vector2(sprite.X, sprite.Y);
var topRightPosition = new Vector2(sprite.X + sprite.Width, sprite.Y);
var bottomRightPosition = new Vector2(sprite.X + sprite.Width, sprite.Y + sprite.Height);
var bottomLeftPosition = new Vector2(sprite.X, sprite.Y + sprite.Height);
var topLeftVertex = new VertexPositionColourTexture(topLeftPosition, scaledColour, topLeftCoord);
var topRightvertex = new VertexPositionColourTexture(topRightPosition, scaledColour, topRightCoord);
var bottomRightVertex = new VertexPositionColourTexture(bottomRightPosition, scaledColour, bottomRightCoord);
var bottomLeftVertex = new VertexPositionColourTexture(bottomLeftPosition, scaledColour, bottomLeftCoord);
sprite.Vertices.ShouldSatisfyAllConditions(
() => sprite.Vertices[0].ShouldBe(topLeftVertex),
() => sprite.Vertices[1].ShouldBe(topRightvertex),
() => sprite.Vertices[2].ShouldBe(bottomRightVertex),
() => sprite.Vertices[3].ShouldBe(bottomLeftVertex)
);
}
