private static void initBuffers()
{
triangleVertexPositionBuffer = new PositionBuffer();
triangleVertexPositionBuffer.Buffer = gl.CreateBuffer();
gl.BindBuffer(gl.ArrayBuffer, triangleVertexPositionBuffer.Buffer);
var vertices = new [] {
0.0, 1.0, 0.0,
-1.0, -1.0, 0.0,
1.0, -1.0, 0.0
};
gl.BufferData(gl.ArrayBuffer, Float32Array.Create(vertices), gl.StaticDraw);
triangleVertexPositionBuffer.ItemSize = 3;
triangleVertexPositionBuffer.NumItems = 3;
squareVertexPositionBuffer = new PositionBuffer();
squareVertexPositionBuffer.Buffer = gl.CreateBuffer();
gl.BindBuffer(gl.ArrayBuffer, squareVertexPositionBuffer.Buffer);
vertices = new [] {
1.0, 1.0, 0.0,
-1.0, 1.0, 0.0,
1.0, -1.0, 0.0,
-1.0, -1.0, 0.0
};
gl.BufferData(gl.ArrayBuffer, Float32Array.Create(vertices), gl.StaticDraw);
squareVertexPositionBuffer.ItemSize = 3;
squareVertexPositionBuffer.NumItems = 4;
}
protected override void OnAfterRender()
{
WebGLContext context = this.canvasReference.CreateWebGL(new WebGLContextAttributes
{
PowerPreference = WebGLContextAttributes.POWER_PREFERENCE_HIGH_PERFORMANCE
});
context.ClearColor(0, 0, 0, 1);
context.Clear(BufferBits.COLOR_BUFFER_BIT);
var program = this.InitProgram(context, VS_SOURCE, FS_SOURCE);
var vertexBuffer = context.CreateBuffer();
context.BindBuffer(BufferType.ARRAY_BUFFER, vertexBuffer);
var vertices = new[]
{
-0.5f, -0.5f, 0.0f, 1.0f, 0.0f, 0.0f,
0.5f, -0.5f, 0.0f, 0.0f, 1.0f, 0.0f,
0.0f, 0.5f, 0.0f, 0.0f, 0.0f, 1.0f
};
context.BufferData(BufferType.ARRAY_BUFFER, vertices, BufferUsageHint.STATIC_DRAW);
context.VertexAttribPointer(0, 3, DataType.FLOAT, false, 6 * sizeof(float), 0);
context.VertexAttribPointer(1, 3, DataType.FLOAT, false, 6 * sizeof(float), 3 * sizeof(float));
context.EnableVertexAttribArray(0);
context.EnableVertexAttribArray(1);
context.UseProgram(program);
context.DrawArrays(Primitive.TRIANGLES, 0, 3);
}
public void SetDataSize(int byteSize)
{
context.BufferData(this, byteSize);
}
