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 Task BindToAttributeAsync(uint attribute)
{
await _gl.BindBufferAsync(BufferType.ARRAY_BUFFER, _dataBuffer);
await _gl.EnableVertexAttribArrayAsync(attribute);
await _gl.VertexAttribPointerAsync(attribute, _size, DataType.FLOAT, false, 0, 0);
}
private static async void InitStaticBuffer(WebGLContext gl)
{
vertexBuffer = await gl.CreateBufferAsync();
await gl.BindBufferAsync(BufferType.ARRAY_BUFFER, vertexBuffer);
{
var vertexArrayDef = new[] {
-0.5f, 0.5f,
0.5f, 0.5f,
0.5f, -0.5f,
-0.5f, -0.5f,
};
await gl.BufferDataAsync(BufferType.ARRAY_BUFFER, vertexArrayDef, BufferUsageHint.STATIC_DRAW);
await gl.EnableVertexAttribArrayAsync(shader.PositionAttributeLocaltion);
await gl.VertexAttribPointerAsync(shader.PositionAttributeLocaltion, 2, DataType.FLOAT, false, sizeof(float) * 2, 0);
}
texBuffer = await gl.CreateBufferAsync();
await gl.BindBufferAsync(BufferType.ARRAY_BUFFER, texBuffer);
{
var texArrayDef = new[]
{
0, 0,
1, 0,
1, 1,
0, 1
};
await gl.BufferDataAsync(BufferType.ARRAY_BUFFER, texArrayDef, BufferUsageHint.STATIC_DRAW);
await gl.EnableVertexAttribArrayAsync(shader.TexturePositionAttributeLocaltion);
await gl.VertexAttribPointerAsync(shader.TexturePositionAttributeLocaltion, 2, DataType.FLOAT, false, sizeof(float) * 2, 0);
}
}
