/// <summary>
/// Draw a sprite at a position with a size
/// </summary>
/// <param name="sprite"></param>
/// <param name="position"></param>
/// <param name="size"></param>
/// <param name="color"></param>
/// <param name="blendType"></param>
/// <exception cref="InvalidOperationException"></exception>
/// <exception cref="NullReferenceException"></exception>
public void DrawSprite(Sprite sprite, Vector3 <float> position, Vector2 <float> size, VulpineLib.Util.Color color, BlendType blendType)
{
Assert();
if (!Drawing)
{
throw new InvalidOperationException("Not drawing; Begin() must be called first");
}
var spriteSet = sprite.SpriteSet;
// If this Sprite's SpriteSet is not the same as the cached previous one, then
// update the cache to the new one and bind the new one's texture
if (spriteSet.Texture != LastSpriteSet?.Texture)
{
if (spriteSet.Texture == null)
{
throw new NullReferenceException($"Sprite's SpriteSet ({sprite.SpriteSet.Name}) has a null Texture");
}
spriteSet.Texture.BindDiffuse();
LastSpriteSet = spriteSet;
}
// If this Sprite is not the same as the cached previous one, then
// update the cache to the new one and set the relevant shader uniforms
if (sprite != LastSprite !)
{
sprite.ShaderProgram.Bind();
sprite.ShaderProgram.SetTextureSource(sprite.TopLeftCoord, sprite.SizeCoord);
LastSprite = sprite;
}
// Bind the BlendType
blendType.Bind();
// Set the model color
sprite.ShaderProgram.SetModelColor(color);
// Set the model position and scale
sprite.ShaderProgram.SetPositionScale(
position,
new Vector3 <float>(size.X, size.Y, 0f)
);
// Draw 4 vertices
GL.DrawArrays(PrimitiveType.TriangleStrip, 0, 4);
State.CheckError();
}
/// <summary>
/// Draw a mesh
/// </summary>
/// <param name="mesh"></param>
/// <param name="transform"></param>
/// <param name="color"></param>
/// <param name="blendType"></param>
public void DrawMesh(GPUMesh <T> mesh, ref Matrix4 <float> transform, VulpineLib.Util.Color color, BlendType blendType)
{
Assert();
if (!Drawing)
{
throw new InvalidOperationException("Not drawing; Begin() must be called first");
}
if (mesh != LastMesh !)
{
mesh.Bind();
LastMesh = mesh;
}
// Bind the BlendType
blendType.Bind();
// Set the model color
mesh.ShaderProgram.SetModelColor(color);
// Set the model matrix
mesh.ShaderProgram.SetModelMatrix(ref transform);
// Draw
mesh.Draw();
State.CheckError();
}