// import { GFXBuffer } from '../gfx/buffer';
// import { GFXBindingType, GFXType } from '../gfx/define';
// import { GFXSampler } from '../gfx/sampler';
// import { GFXUniformBlock, GFXUniformSampler } from '../gfx/shader';
// import { GFXTextureView } from '../gfx/texture-view';

export const PIPELINE_FLOW_FORWARD: string = 'ForwardFlow';
export const PIPELINE_FLOW_SMAA: string = 'SMAAFlow';
export const PIPELINE_FLOW_TONEMAP: string = 'ToneMapFlow';

export enum RenderPassStage {
    DEFAULT = 100,
}

export enum RenderPriority {
    MIN = 0,
    MAX = 0xff,
    DEFAULT = 0x80,
}

const MAX_BINDING_SUPPORTED = 24; // from WebGL 2 spec
export enum UniformBinding {
    // UBOs
    UBO_GLOBAL = MAX_BINDING_SUPPORTED - 1,
    UBO_SHADOW = MAX_BINDING_SUPPORTED - 2,

    UBO_LOCAL = MAX_BINDING_SUPPORTED - 3,
    UBO_FORWARD_LIGHTS = MAX_BINDING_SUPPORTED - 4,
    UBO_SKINNING = MAX_BINDING_SUPPORTED - 5,
    UBO_SKINNING_TEXTURE = MAX_BINDING_SUPPORTED - 6,
    UBO_UI = MAX_BINDING_SUPPORTED - 7,

    // samplers
    SAMPLER_JOINTS = MAX_BINDING_SUPPORTED + 1,
    SAMPLER_ENVIRONMENT = MAX_BINDING_SUPPORTED + 2,

    // rooms left for custom bindings
    // effect importer prepares bindings according to this
    CUSTUM_UBO_BINDING_END_POINT = MAX_BINDING_SUPPORTED - 7,
    CUSTOM_SAMPLER_BINDING_START_POINT = MAX_BINDING_SUPPORTED + 6,
}

// export class UBOGlobal {
//     public static TIME_OFFSET: number = 0;
//     public static SCREEN_SIZE_OFFSET: number = UBOGlobal.TIME_OFFSET + 4;
//     public static SCREEN_SCALE_OFFSET: number = UBOGlobal.SCREEN_SIZE_OFFSET + 4;
//     public static NATIVE_SIZE_OFFSET: number = UBOGlobal.SCREEN_SCALE_OFFSET + 4;
//     public static MAT_VIEW_OFFSET: number = UBOGlobal.NATIVE_SIZE_OFFSET + 4;
//     public static MAT_VIEW_INV_OFFSET: number = UBOGlobal.MAT_VIEW_OFFSET + 16;
//     public static MAT_PROJ_OFFSET: number = UBOGlobal.MAT_VIEW_INV_OFFSET + 16;
//     public static MAT_PROJ_INV_OFFSET: number = UBOGlobal.MAT_PROJ_OFFSET + 16;
//     public static MAT_VIEW_PROJ_OFFSET: number = UBOGlobal.MAT_PROJ_INV_OFFSET + 16;
//     public static MAT_VIEW_PROJ_INV_OFFSET: number = UBOGlobal.MAT_VIEW_PROJ_OFFSET + 16;
//     public static CAMERA_POS_OFFSET: number = UBOGlobal.MAT_VIEW_PROJ_INV_OFFSET + 16;
//     public static EXPOSURE_OFFSET: number = UBOGlobal.CAMERA_POS_OFFSET + 4;
//     public static MAIN_LIT_DIR_OFFSET: number = UBOGlobal.EXPOSURE_OFFSET + 4;
//     public static MAIN_LIT_COLOR_OFFSET: number = UBOGlobal.MAIN_LIT_DIR_OFFSET + 4;
//     public static AMBIENT_SKY_OFFSET: number = UBOGlobal.MAIN_LIT_COLOR_OFFSET + 4;
//     public static AMBIENT_GROUND_OFFSET: number = UBOGlobal.AMBIENT_SKY_OFFSET + 4;
//     public static COUNT: number = UBOGlobal.AMBIENT_GROUND_OFFSET + 4;
//     public static SIZE: number = UBOGlobal.COUNT * 4;

//     public static BLOCK: GFXUniformBlock = {
//         binding: UniformBinding.UBO_GLOBAL, name: 'CCGlobal', members: [
//             { name: 'cc_time', type: GFXType.FLOAT4, count: 1 },
//             { name: 'cc_screenSize', type: GFXType.FLOAT4, count: 1 },
//             { name: 'cc_screenScale', type: GFXType.FLOAT4, count: 1 },
//             { name: 'cc_nativeSize', type: GFXType.FLOAT4, count: 1 },
//             { name: 'cc_matView', type: GFXType.MAT4, count: 1 },
//             { name: 'cc_matViewInv', type: GFXType.MAT4, count: 1 },
//             { name: 'cc_matProj', type: GFXType.MAT4, count: 1 },
//             { name: 'cc_matProjInv', type: GFXType.MAT4, count: 1 },
//             { name: 'cc_matViewProj', type: GFXType.MAT4, count: 1 },
//             { name: 'cc_matViewProjInv', type: GFXType.MAT4, count: 1 },
//             { name: 'cc_cameraPos', type: GFXType.FLOAT4, count: 1 },
//             { name: 'cc_exposure', type: GFXType.FLOAT4, count: 1 },
//             { name: 'cc_mainLitDir', type: GFXType.FLOAT4, count: 1 },
//             { name: 'cc_mainLitColor', type: GFXType.FLOAT4, count: 1 },
//             { name: 'cc_ambientSky', type: GFXType.FLOAT4, count: 1 },
//             { name: 'cc_ambientGround', type: GFXType.FLOAT4, count: 1 },
//         ],
//     };

//     public view: Float32Array = new Float32Array(UBOGlobal.COUNT);
// }

// export class UBOShadow {
//     public static MAT_LIGHT_PLANE_PROJ_OFFSET: number = 0;
//     public static SHADOW_COLOR_OFFSET: number = UBOShadow.MAT_LIGHT_PLANE_PROJ_OFFSET + 16;
//     public static COUNT: number = UBOShadow.SHADOW_COLOR_OFFSET + 4;
//     public static SIZE: number = UBOShadow.COUNT * 4;

//     public static BLOCK: GFXUniformBlock = {
//         binding: UniformBinding.UBO_SHADOW, name: 'CCShadow', members: [
//             { name: 'cc_matLightPlaneProj', type: GFXType.MAT4, count: 1 },
//             { name: 'cc_shadowColor', type: GFXType.FLOAT4, count: 1 },
//         ],
//     };

//     public view: Float32Array = new Float32Array(UBOShadow.COUNT);
// }

// export const localBindingsDesc: Map<string, IInternalBindingDesc> = new Map<string, IInternalBindingDesc>();

// export class UBOLocal {
//     public static MAT_WORLD_OFFSET: number = 0;
//     public static MAT_WORLD_IT_OFFSET: number = UBOLocal.MAT_WORLD_OFFSET + 16;
//     public static COUNT: number = UBOLocal.MAT_WORLD_IT_OFFSET + 16;
//     public static SIZE: number = UBOLocal.COUNT * 4;

//     public static BLOCK: GFXUniformBlock = {
//         binding: UniformBinding.UBO_LOCAL, name: 'CCLocal', members: [
//             { name: 'cc_matWorld', type: GFXType.MAT4, count: 1 },
//             { name: 'cc_matWorldIT', type: GFXType.MAT4, count: 1 },
//         ],
//     };

//     public view: Float32Array = new Float32Array(UBOLocal.COUNT);
// }
// localBindingsDesc.set(UBOLocal.BLOCK.name, {
//     type: GFXBindingType.UNIFORM_BUFFER,
//     blockInfo: UBOLocal.BLOCK,
// });

// export class UBOForwardLight {
//     public static MAX_SPHERE_LIGHTS = 2;
//     public static MAX_SPOT_LIGHTS = 2;

//     public static SPHERE_LIGHT_POS_OFFSET: number = 0;
//     public static SPHERE_LIGHT_SIZE_RANGE_OFFSET: number = UBOForwardLight.SPHERE_LIGHT_POS_OFFSET + UBOForwardLight.MAX_SPHERE_LIGHTS * 4;
//     public static SPHERE_LIGHT_COLOR_OFFSET: number = UBOForwardLight.SPHERE_LIGHT_SIZE_RANGE_OFFSET + UBOForwardLight.MAX_SPHERE_LIGHTS * 4;
//     public static SPOT_LIGHT_POS_OFFSET: number = UBOForwardLight.SPHERE_LIGHT_COLOR_OFFSET + UBOForwardLight.MAX_SPOT_LIGHTS * 4;
//     public static SPOT_LIGHT_SIZE_RANGE_ANGLE_OFFSET: number = UBOForwardLight.SPOT_LIGHT_POS_OFFSET + UBOForwardLight.MAX_SPOT_LIGHTS * 4;
//     public static SPOT_LIGHT_DIR_OFFSET: number = UBOForwardLight.SPOT_LIGHT_SIZE_RANGE_ANGLE_OFFSET + UBOForwardLight.MAX_SPOT_LIGHTS * 4;
//     public static SPOT_LIGHT_COLOR_OFFSET: number = UBOForwardLight.SPOT_LIGHT_DIR_OFFSET + UBOForwardLight.MAX_SPOT_LIGHTS * 4;
//     public static COUNT: number = UBOForwardLight.SPOT_LIGHT_COLOR_OFFSET + UBOForwardLight.MAX_SPOT_LIGHTS * 4;
//     public static SIZE: number = UBOForwardLight.COUNT * 4;

//     public static BLOCK: GFXUniformBlock = {
//         binding: UniformBinding.UBO_FORWARD_LIGHTS, name: 'CCForwardLight', members: [
//             { name: 'cc_sphereLitPos', type: GFXType.FLOAT4, count: UBOForwardLight.MAX_SPHERE_LIGHTS },
//             { name: 'cc_sphereLitSizeRange', type: GFXType.FLOAT4, count: UBOForwardLight.MAX_SPHERE_LIGHTS },
//             { name: 'cc_sphereLitColor', type: GFXType.FLOAT4, count: UBOForwardLight.MAX_SPHERE_LIGHTS },
//             { name: 'cc_spotLitPos', type: GFXType.FLOAT4, count: UBOForwardLight.MAX_SPOT_LIGHTS },
//             { name: 'cc_spotLitSizeRangeAngle', type: GFXType.FLOAT4, count: UBOForwardLight.MAX_SPOT_LIGHTS },
//             { name: 'cc_spotLitDir', type: GFXType.FLOAT4, count: UBOForwardLight.MAX_SPOT_LIGHTS },
//             { name: 'cc_spotLitColor', type: GFXType.FLOAT4, count: UBOForwardLight.MAX_SPOT_LIGHTS },
//         ],
//     };

//     public view: Float32Array = new Float32Array(UBOForwardLight.COUNT);
// }
// localBindingsDesc.set(UBOForwardLight.BLOCK.name, {
//     type: GFXBindingType.UNIFORM_BUFFER,
//     blockInfo: UBOForwardLight.BLOCK,
// });

// export class UBOSkinning {
//     public static MAT_JOINT_OFFSET: number = 0;
//     public static JOINTS_TEXTURE_SIZE_OFFSET: number = UBOSkinning.MAT_JOINT_OFFSET + 128 * 16;
//     public static COUNT: number = UBOSkinning.JOINTS_TEXTURE_SIZE_OFFSET + 4;
//     public static SIZE: number = UBOSkinning.COUNT * 4;

//     public static BLOCK: GFXUniformBlock = {
//         binding: UniformBinding.UBO_SKINNING, name: 'CCSkinning', members: [
//             { name: 'cc_matJoint', type: GFXType.MAT4, count: 128 },
//             { name: 'cc_jointsTextureSize', type: GFXType.FLOAT4, count: 1 },
//         ],
//     };
// }
// localBindingsDesc.set(UBOSkinning.BLOCK.name, {
//     type: GFXBindingType.UNIFORM_BUFFER,
//     blockInfo: UBOSkinning.BLOCK,
// });

// export const UNIFORM_JOINTS_TEXTURE: GFXUniformSampler = {
//     binding: UniformBinding.SAMPLER_JOINTS, name: 'cc_jointsTexture', type: GFXType.SAMPLER2D, count: 1,
// };
// localBindingsDesc.set(UNIFORM_JOINTS_TEXTURE.name, {
//     type: GFXBindingType.SAMPLER,
//     samplerInfo: UNIFORM_JOINTS_TEXTURE,
// });

// export interface IInternalBindingDesc {
//     type: GFXBindingType;
//     blockInfo?: GFXUniformBlock;
//     samplerInfo?: GFXUniformSampler;
// }

// export interface IInternalBindingInst extends IInternalBindingDesc {
//     buffer?: GFXBuffer;
//     sampler?: GFXSampler;
//     textureView?: GFXTextureView;
// }