public async Task Initialize()
{
_context = await _canvasReference.CreateWebGLAsync(new WebGLContextAttributes
{
PowerPreference = WebGLContextAttributes.POWER_PREFERENCE_HIGH_PERFORMANCE
});
vertexBuffer = await _context.CreateBufferAsync();
await _context.BindBufferAsync(BufferType.ARRAY_BUFFER, vertexBuffer);
var program = await this.InitProgramAsync(this._context, VS_SOURCE, FS_SOURCE);
var positionLocation = await _context.GetAttribLocationAsync(program, "aPos");
var texcoordLocation = await _context.GetAttribLocationAsync(program, "aTex");
await _context.VertexAttribPointerAsync((uint)positionLocation, 3, DataType.FLOAT, false, 6 *sizeof(float), 0);
await _context.VertexAttribPointerAsync((uint)texcoordLocation, 2, DataType.FLOAT, false, 6 *sizeof(float), 3 *sizeof(float));
await _context.EnableVertexAttribArrayAsync((uint)positionLocation);
await _context.EnableVertexAttribArrayAsync((uint)texcoordLocation);
await _context.UseProgramAsync(program);
var texture = await _context.CreateTextureAsync();
await _context.BindTextureAsync(TextureType.TEXTURE_2D, texture);
}
public async void Build(WebGLContext gl)
{
await InitProgramAsync(gl, VertexProgramString, FragmentProgramString);
ViewProjectionLocation = await gl.GetUniformLocationAsync(ShaderProgram, "ViewProjection");
AnchorLocation = await gl.GetUniformLocationAsync(ShaderProgram, "in_anchor");
ColorLocation = await gl.GetUniformLocationAsync(ShaderProgram, "in_color");
FilpLocation = await gl.GetUniformLocationAsync(ShaderProgram, "in_flip");
ModelLocation = await gl.GetUniformLocationAsync(ShaderProgram, "in_model");
PositionAttributeLocaltion = (uint)await gl.GetAttribLocationAsync(ShaderProgram, "in_pos");
TexturePositionAttributeLocaltion = (uint)await gl.GetAttribLocationAsync(ShaderProgram, "in_texPos");
}
public static async Task <ShaderProgram> InitShaderProgram(WebGLContext gl, string vsSource, string fsSource, List <string> attributesNames = null, List <string> uniformsNames = null)
{
var vertexShader = await LoadShaderAsync(gl, ShaderType.VERTEX_SHADER, vsSource);
var fragmentShader = await LoadShaderAsync(gl, ShaderType.FRAGMENT_SHADER, fsSource);
var program = await gl.CreateProgramAsync();
await gl.AttachShaderAsync(program, vertexShader);
await gl.AttachShaderAsync(program, fragmentShader);
await gl.LinkProgramAsync(program);
await gl.DeleteShaderAsync(vertexShader);
await gl.DeleteShaderAsync(fragmentShader);
if (!await gl.GetProgramParameterAsync <bool>(program, ProgramParameter.LINK_STATUS))
{
string info = await gl.GetProgramInfoLogAsync(program);
throw new Exception("An error occured while linking the program: " + info);
}
attributesNames ??= new List <string>();
var attributesDict = new Dictionary <string, int>();
foreach (var attribute in attributesNames)
{
attributesDict.Add(attribute, await gl.GetAttribLocationAsync(program, attribute));
}
uniformsNames ??= new List <string>();
var uniformsDict = new Dictionary <string, WebGLUniformLocation>();
foreach (var uniform in uniformsNames)
{
uniformsDict.Add(uniform, await gl.GetUniformLocationAsync(program, uniform));
}
return(new ShaderProgram(program, gl, attributesDict, uniformsDict));
}