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author | Matthias Schiffer <mschiffer@universe-factory.net> | 2018-12-08 12:39:18 +0100 |
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committer | Matthias Schiffer <mschiffer@universe-factory.net> | 2018-12-08 12:39:18 +0100 |
commit | b3950330e3351437f153c6c1debb3821d6e28864 (patch) | |
tree | 0b381b523045bd59cd679825a11976a45813fc24 /src/renderer/view/renderer/renderer.ts | |
parent | 439dcf391784ea3abb61473c74b9c27fcd9fdc2d (diff) | |
download | rpgedit-b3950330e3351437f153c6c1debb3821d6e28864.tar rpgedit-b3950330e3351437f153c6c1debb3821d6e28864.zip |
Create Electron app
Diffstat (limited to 'src/renderer/view/renderer/renderer.ts')
-rw-r--r-- | src/renderer/view/renderer/renderer.ts | 99 |
1 files changed, 99 insertions, 0 deletions
diff --git a/src/renderer/view/renderer/renderer.ts b/src/renderer/view/renderer/renderer.ts new file mode 100644 index 0000000..93f8589 --- /dev/null +++ b/src/renderer/view/renderer/renderer.ts @@ -0,0 +1,99 @@ +import { Shaders } from './shaders'; + +import { mat4, vec2 } from 'gl-matrix'; + +export class Renderer { + public readonly coordScale = 32; + private readonly viewScale = 2; + + private readonly gl: WebGLRenderingContext; + private readonly shaders: Shaders; + + private readonly center: vec2 = vec2.create(); + private readonly translation: vec2 = vec2.create(); + private readonly viewport: mat4 = mat4.create(); + + constructor(private readonly canvas: HTMLCanvasElement) { + this.gl = this.mkContext(); + + this.shaders = new Shaders(this.gl); + + this.gl.clearColor(0.0, 0.0, 0.0, 1.0); + + this.gl.enable(this.gl.BLEND); + this.gl.blendFunc(this.gl.ONE, this.gl.ONE_MINUS_SRC_ALPHA); + this.gl.pixelStorei(this.gl.UNPACK_PREMULTIPLY_ALPHA_WEBGL, 1); + + this.setSize(); + } + + public createBuffer(): WebGLBuffer { + const ret = this.gl.createBuffer(); + if (!ret) + throw new Error('unable to create buffer'); + + return ret; + } + + public getContext(): WebGLRenderingContext { + return this.gl; + } + + public getVertexPosLoc(): number { + return this.shaders.vertexPosLoc; + } + + public getTextureCoordLoc(): number { + return this.shaders.textureCoordLoc; + } + + public getSamplerLoc(): WebGLUniformLocation { + return this.shaders.samplerLoc; + } + + public setCenter(v: vec2|number[]) { + this.snapToGrid(this.center, v); + } + + public setTranslation(v: vec2|number[]) { + vec2.sub(this.translation, v, this.center); + this.snapToGrid(this.translation, this.translation); + this.gl.uniform2fv(this.shaders.translateLoc, this.translation); + } + + public clear(): void { + this.gl.clear(this.gl.COLOR_BUFFER_BIT); + + this.setTranslation([0, 0]); + } + + public snapToGrid(out: vec2, a: vec2|number[]): void { + vec2.scale(out, a, this.coordScale); + vec2.round(out, out); + vec2.scale(out, out, 1 / this.coordScale); + } + + private mkContext(): WebGLRenderingContext { + const gl = ( + this.canvas.getContext('webgl') || this.canvas.getContext('experimental-webgl') + ); + if (!gl) + throw new Error('unable to initialize WebGL context'); + + return gl; + } + + private setSize(): void { + const w = this.canvas.width; + const h = this.canvas.height; + + this.gl.viewport(0, 0, w, h); + this.clear(); + + const scale = this.viewScale * this.coordScale; + + mat4.identity(this.viewport); + mat4.scale(this.viewport, this.viewport, [2 * scale / w, -2 * scale / h, 1.0]); + this.gl.uniformMatrix4fv(this.shaders.viewportLoc, false, this.viewport); + } +} |