/// <summary>
/// Gets an OpenGL Shader Program from the resource cache - if the program is
/// not already cached, an attempt will be made to load it.
/// </summary>
/// <param name="programName">The name of the program.</param>
/// <returns>The ID of the OpenGL Shader Program object.</returns>
public uint GetShaderProgram(string programName)
{
if (Disposing || Disposed)
{
return(0);
}
// If the shader program has previously been loaded, return its GL
// ID
//
if (ShaderPrograms.ContainsKey(programName))
{
return(ShaderPrograms[programName]);
}
// We reached here, program has not yet been cached, need to
// compile it from sources
//
string fragmentSource = File.ReadAllText(Environment.CurrentDirectory + @"\Content\Shaders\OpenGL\" + programName + @"\fragment.glsl");
string vertexSource = File.ReadAllText(Environment.CurrentDirectory + @"\Content\Shaders\OpenGL\" + programName + @"\vertex.glsl");
uint compiledProgramId = GlUtil.CompileShaderProgram(vertexSource, fragmentSource);
ShaderPrograms.Add(programName, compiledProgramId);
return(compiledProgramId);
}
/// <summary>
/// Issues a draw command to this batch.
/// </summary>
/// <param name="spriteName">The name of the sprite.</param>
/// <param name="rect">The rectangle space to draw the sprite at.</param>
public void Draw(string spriteName, Rectanglei rect)
{
Rectanglei spriteRect = Atlas.GetSpriteUV(spriteName);
VboDrawContents.AddRange(GlUtil.MakeVboData(rect));
VboUvContents.AddRange(GlUtil.MakeVboData(spriteRect));
VertexCount += 12;
}
/// <summary>
/// Loads a sprite atlas from supplied files on disk.
/// </summary>
/// <param name="filename">
/// The filename of the atlas, the extension will be ignored.
/// </param>
/// <returns>
/// A <see cref="GlSpriteAtlas"/> created from the supplied data.
/// </returns>
public static GlSpriteAtlas LoadAtlas(string filename)
{
// Read texture atlas information and bitmap data
//
string atlasPath = Path.GetDirectoryName(filename);
string atlasNoExt = Path.GetFileNameWithoutExtension(filename);
var atlasBmp = (Bitmap)Image.FromFile(atlasPath + @"\" + atlasNoExt + ".png");
var atlasJson = File.ReadAllText(atlasPath + @"\" + atlasNoExt + ".json");
var atlasNodeArray = JArray.Parse(atlasJson);
var atlasMap = new Dictionary <string, Rectanglei>();
foreach (JToken token in atlasNodeArray)
{
string key = token.Value <string>("Name").ToLower();
string boundsCsv = token.Value <string>("Bounds");
var rectangleComponents = new List <int>();
foreach (string boundComponent in boundsCsv.Split(','))
{
rectangleComponents.Add(Convert.ToInt32(boundComponent));
}
atlasMap.Add(
key,
new Rectanglei(
rectangleComponents[0],
rectangleComponents[1],
rectangleComponents[2],
rectangleComponents[3]
)
);
}
// Read out atlas dimensions
//
Vector2 atlasDimensions = new Vector2(
atlasBmp.Width,
atlasBmp.Height
);
// Load the bitmap into OpenGL
//
int glTextureId = GlUtil.LoadBitmapTexture(atlasBmp);
// Dispose the atlas resource
//
atlasBmp.Dispose();
return(new GlSpriteAtlas(atlasDimensions, glTextureId, atlasMap));
}
/// <summary>
/// Initializes a new instance of the <see cref="GlSpriteBatch"/> class.
/// </summary>
/// <param name="atlasFullPath"></param>
/// <param name="glProgramId"></param>
public GlSpriteBatch(string atlasFullPath, uint glProgramId)
{
Atlas = GlUtil.LoadAtlas(atlasFullPath);
GlProgramId = glProgramId;
GlCanvasResolutionUniformId = GL.GetUniformLocation(
GlProgramId,
"CanvasResolution"
);
GlUvMapResolutionUniformId = GL.GetUniformLocation(
GlProgramId,
"UvMapResolution"
);
VertexCount = 0;
VboDrawContents = new List <float>();
VboUvContents = new List <float>();
}
