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);
}
private static void drawScene()
{
gl.Viewport(0, 0, viewportWidth, viewportHeight);
gl.Clear(gl.ColorBufferBit | gl.DepthBufferBit);
pMatrix = Matrix4.Perspective(45, viewportWidth / viewportHeight, 0.1, 100.0);
// Draw triangle
mvMatrix = Matrix4.Translate(-1.5, 0.0, -7.0);
gl.BindBuffer(gl.ArrayBuffer, triangleVertexPositionBuffer.Buffer);
gl.VertexAttributePointer(vertexPositionAttribute, triangleVertexPositionBuffer.ItemSize, gl.Float, false, 0, 0);
setMatrixUniforms();
gl.DrawArrays(gl.Triangles, 0, triangleVertexPositionBuffer.NumItems);
// Draw square
mvMatrix = Matrix4.Translate(1.5, 0.0, -7.0);
gl.BindBuffer(gl.ArrayBuffer, squareVertexPositionBuffer.Buffer);
gl.VertexAttributePointer(vertexPositionAttribute, squareVertexPositionBuffer.ItemSize, gl.Float, false, 0, 0);
setMatrixUniforms();
gl.DrawArrays(gl.TriangleStrip, 0, squareVertexPositionBuffer.NumItems);
}