export function createTexture(img) {
    let texture = _gl.createTexture();
    _gl.bindTexture(_gl.TEXTURE_2D, texture);

    _gl.texParameteri(_gl.TEXTURE_2D, _gl.TEXTURE_WRAP_S, _gl.CLAMP_TO_EDGE);
    _gl.texParameteri(_gl.TEXTURE_2D, _gl.TEXTURE_WRAP_T, _gl.CLAMP_TO_EDGE);
    _gl.texParameteri(_gl.TEXTURE_2D, _gl.TEXTURE_MIN_FILTER, _gl.NEAREST);
    _gl.texParameteri(_gl.TEXTURE_2D, _gl.TEXTURE_MAG_FILTER, _gl.NEAREST);

    let mipLevel = 0;
    let internalFormat = _gl.RGBA;
    let srcFormat = _gl.RGBA;
    let srcType = _gl.UNSIGNED_BYTE;
    _gl.texImage2D(_gl.TEXTURE_2D, mipLevel, internalFormat, srcFormat, srcType, img);

    return {
        texture: texture,
        width: img.width,
        height: img.height,
    };
}

export function render(r, g, b, a) {

    let programData = _programs[0];

    _gl.viewport(0, 0, _gl.canvas.width, _gl.canvas.height);

    clear(r, g, b, a);

    _gl.useProgram(programData.program);

    for (var actor of _actors.keys()) {
        _gl.bindVertexArray(actor.vertexArray);

        _gl.activeTexture(_gl.TEXTURE0 + 0);
        _gl.bindTexture(_gl.TEXTURE_2D, actor.texture);

        _gl.uniform1i(programData.uniforms.image, 0);
        _gl.uniform2f(programData.uniforms.resolution, _gl.canvas.width, _gl.canvas.height);
        _gl.uniform2f(programData.uniforms.uvModifier, 1.0, 1.0);
        _gl.uniform2f(programData.uniforms.uvTranslator, 0.0, 0.0);

        _gl.drawArrays(_gl.TRIANGLES, 0, 6);
    }
}