diff options
Diffstat (limited to 'src/view/util/image.ts')
| -rw-r--r-- | src/view/util/image.ts | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/src/view/util/image.ts b/src/view/util/image.ts index e01246c..7baeccc 100644 --- a/src/view/util/image.ts +++ b/src/view/util/image.ts @@ -14,13 +14,15 @@ export function loadImage(url: string): Promise<HTMLImageElement> { export function mkTexture( r: Renderer, src: HTMLCanvasElement|HTMLImageElement, + frame: number = 0, + total: number = 1, ): [WebGLTexture, [number, number], SpriteCoords] { const gl = r.getContext(); const texture = gl.createTexture(); if (!texture) throw new Error('unable to create texture'); - const w = src.width, h = src.height; + const w = src.width, h = src.height / total; const w2 = nextPowerOf2(w), h2 = nextPowerOf2(h); const canvas = document.createElement('canvas'); @@ -28,7 +30,7 @@ export function mkTexture( canvas.height = h2; const ctx = canvas.getContext('2d') as CanvasRenderingContext2D; - ctx.drawImage(src, 0, 0); + ctx.drawImage(src, 0, frame * h, w, h, 0, 0, w, h); gl.bindTexture(gl.TEXTURE_2D, texture); gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, gl.RGBA, gl.UNSIGNED_BYTE, canvas); |