public async Task RenderFrame()
{
await _context.ClearColorAsync(0, 0, 0, 1);
await _context.ClearAsync(BufferBits.COLOR_BUFFER_BIT);
Buffer.BlockCopy(spriteEngine.vertices, 0, byteArr, 0, byteArr.Length);
await _context.BufferDataAsync(BufferType.ARRAY_BUFFER, byteArr, BufferUsageHint.DYNAMIC_DRAW);
// this matrix will convert from pixels to clip space
Matrix4x4 myMatrix = Matrix4x4.CreateOrthographic(_canvasReference.Width, _canvasReference.Height, 1, -1);
// this matrix will translate our quad to dstX, dstY
Matrix4x4 transMatrix = Matrix4x4.CreateTranslation(transVector);
myMatrix = Matrix4x4.Multiply(myMatrix, transMatrix);
// Set the matrix.
await _context.UniformMatrixAsync(u_matrix_location, false, new float[16] {
myMatrix.M11, myMatrix.M12, myMatrix.M13, myMatrix.M14, myMatrix.M21, myMatrix.M22, myMatrix.M23, myMatrix.M24, myMatrix.M31, myMatrix.M32, myMatrix.M33, myMatrix.M34, myMatrix.M41, myMatrix.M42, myMatrix.M43, myMatrix.M44
});
await _context.DrawArraysAsync(Primitive.TRIANGLES, 0, 6 *spriteEngine.spriteCount);
spriteEngine.spriteCount = 0;
}
public static async Task DrawObject(WebGLContext gl, StoryboardObject obj)
{
if (!textureResourceMap.TryGetValue(obj.ImageFilePath, out var textureResource))
{
return;
}
ChangeAdditiveStatus(gl, obj.IsAdditive);
var is_xflip = Math.Sign(obj.Scale.X);
var is_yflip = Math.Sign(obj.Scale.Y);
//adjust scale transform which value is negative
var horizon_flip = obj.IsHorizonFlip | (is_xflip < 0);
var vertical_flip = obj.IsHorizonFlip | (is_yflip < 0);
float scalex = is_xflip * obj.Scale.X * textureResource.Size.Width;
float scaley = is_yflip * obj.Scale.Y * textureResource.Size.Height;
await shader.UpdateColor(gl, obj.Color.X, obj.Color.Y, obj.Color.Z, obj.Color.W);
await shader.UpdateFlip(gl, horizon_flip? -1 : 1, vertical_flip? -1 : 1);
//anchor
await shader.UpdateAnchor(gl, obj.OriginOffset.X, obj.OriginOffset.Y);
//Create ModelMatrix
Matrix3 model = Matrix3.Zero;
float cosa = (float)Math.Cos(obj.Rotate);
float sina = (float)Math.Sin(obj.Rotate);
model.Row0.X = cosa * scalex;
model.Row0.Y = -sina * scalex;
model.Row1.X = sina * scaley;
model.Row1.Y = cosa * scaley;
model.Row2.X = obj.Postion.X - SB_WIDTH / 2f;
model.Row2.Y = -obj.Postion.Y + SB_HEIGHT / 2f;
unsafe
{
fixed(float *ptr = &martrix3Buffer[0])
{
Unsafe.CopyBlock(ptr, &model.Row0.X, 9 * sizeof(float));
}
}
await shader.UpdateModel(gl, false, martrix3Buffer);
await shader.UpdateTexture(gl, textureResource.Texture);
await gl.DrawArraysAsync(Primitive.TRIANGLE_FAN, 0, 4);
}
public async Task DrawAsync(ShaderProgram shaderProgram)
{
//TODO: add attribute dictionary to the shader program
await _positions.BindToAttributeAsync((uint)shaderProgram.Attributes.GetValueOrDefault("position"));
await _normals.BindToAttributeAsync((uint)shaderProgram.Attributes.GetValueOrDefault("normal"));
await _uvs.BindToAttributeAsync((uint)shaderProgram.Attributes.GetValueOrDefault("uv"));
await _gl.UniformMatrixAsync(shaderProgram.Uniforms.GetValueOrDefault("model"), false, _position);
await _texture.UseAsync(shaderProgram.Uniforms.GetValueOrDefault("diffuse"), 0);
await _gl.DrawArraysAsync(Primitive.TRIANGLES, 0, _vertexCount);
}