105 lines
3.9 KiB
TypeScript
105 lines
3.9 KiB
TypeScript
|
// pathfinder/client/src/gl-utils.ts
|
||
|
|
//
|
||
|
|
// Copyright © 2017 The Pathfinder Project Developers.
|
||
|
|
//
|
||
|
|
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
|
||
|
|
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
|
||
|
|
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
|
||
|
|
// option. This file may not be copied, modified, or distributed
|
||
|
|
// except according to those terms.
|
||
|
|
|
||
|
|
import * as glmatrix from 'gl-matrix';
|
||
|
|
|
||
|
|
import {UINT32_SIZE, assert, unwrapNull} from './utils';
|
||
|
|
|
||
|
|
export type WebGLVertexArrayObject = any;
|
||
|
|
|
||
|
|
export interface AttributeMap {
|
||
|
|
[attributeName: string]: number;
|
||
|
|
}
|
||
|
|
|
||
|
|
export interface UniformMap {
|
||
|
|
[uniformName: string]: WebGLUniformLocation;
|
||
|
|
}
|
||
|
|
|
||
|
|
export const QUAD_ELEMENTS: Uint8Array = new Uint8Array([2, 0, 1, 1, 3, 2]);
|
||
|
|
|
||
|
|
export function createFramebufferColorTexture(gl: WebGLRenderingContext, size: glmatrix.vec2):
|
||
|
|
WebGLTexture {
|
||
|
|
// Firefox seems to have a bug whereby textures don't get marked as initialized when cleared
|
||
|
|
// if they're anything other than the first attachment of an FBO. To work around this, supply
|
||
|
|
// zero data explicitly when initializing the texture.
|
||
|
|
const zeroes = new Uint8Array(size[0] * size[1] * UINT32_SIZE);
|
||
|
|
const texture = unwrapNull(gl.createTexture());
|
||
|
|
gl.activeTexture(gl.TEXTURE0);
|
||
|
|
gl.bindTexture(gl.TEXTURE_2D, texture);
|
||
|
|
gl.texImage2D(gl.TEXTURE_2D,
|
||
|
|
0,
|
||
|
|
gl.RGBA,
|
||
|
|
size[0],
|
||
|
|
size[1],
|
||
|
|
0,
|
||
|
|
gl.RGBA,
|
||
|
|
gl.UNSIGNED_BYTE,
|
||
|
|
zeroes);
|
||
|
|
setTextureParameters(gl, gl.NEAREST);
|
||
|
|
return texture;
|
||
|
|
}
|
||
|
|
|
||
|
|
export function createFramebufferDepthTexture(gl: WebGLRenderingContext, size: glmatrix.vec2):
|
||
|
|
WebGLTexture {
|
||
|
|
const texture = unwrapNull(gl.createTexture());
|
||
|
|
gl.activeTexture(gl.TEXTURE0);
|
||
|
|
gl.bindTexture(gl.TEXTURE_2D, texture);
|
||
|
|
gl.texImage2D(gl.TEXTURE_2D,
|
||
|
|
0,
|
||
|
|
gl.DEPTH_COMPONENT,
|
||
|
|
size[0],
|
||
|
|
size[1],
|
||
|
|
0,
|
||
|
|
gl.DEPTH_COMPONENT,
|
||
|
|
gl.UNSIGNED_INT,
|
||
|
|
null);
|
||
|
|
setTextureParameters(gl, gl.NEAREST);
|
||
|
|
return texture;
|
||
|
|
}
|
||
|
|
|
||
|
|
export function setTextureParameters(gl: WebGLRenderingContext, filter: number) {
|
||
|
|
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_MAG_FILTER, filter);
|
||
|
|
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, filter);
|
||
|
|
}
|
||
|
|
|
||
|
|
export function createFramebuffer(gl: WebGLRenderingContext,
|
||
|
|
drawBuffersExt: any,
|
||
|
|
colorAttachments: WebGLTexture[],
|
||
|
|
depthAttachment: WebGLTexture | null):
|
||
|
|
WebGLFramebuffer {
|
||
|
|
const framebuffer = unwrapNull(gl.createFramebuffer());
|
||
|
|
gl.bindFramebuffer(gl.FRAMEBUFFER, framebuffer);
|
||
|
|
|
||
|
|
const colorAttachmentCount = colorAttachments.length;
|
||
|
|
for (let colorAttachmentIndex = 0;
|
||
|
|
colorAttachmentIndex < colorAttachmentCount;
|
||
|
|
colorAttachmentIndex++) {
|
||
|
|
gl.framebufferTexture2D(gl.FRAMEBUFFER,
|
||
|
|
drawBuffersExt[`COLOR_ATTACHMENT${colorAttachmentIndex}_WEBGL`],
|
||
|
|
gl.TEXTURE_2D,
|
||
|
|
colorAttachments[colorAttachmentIndex],
|
||
|
|
0);
|
||
|
|
}
|
||
|
|
|
||
|
|
if (depthAttachment != null) {
|
||
|
|
gl.framebufferTexture2D(gl.FRAMEBUFFER,
|
||
|
|
gl.DEPTH_ATTACHMENT,
|
||
|
|
gl.TEXTURE_2D,
|
||
|
|
depthAttachment,
|
||
|
|
0);
|
||
|
|
}
|
||
|
|
|
||
|
|
assert(gl.checkFramebufferStatus(gl.FRAMEBUFFER) == gl.FRAMEBUFFER_COMPLETE,
|
||
|
|
"Framebuffer was incomplete!");
|
||
|
|
return framebuffer;
|
||
|
|
}
|