cassdlcm/mediapipe
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Add setGpuBufferVerticalFlip to GraphRunner TS API

Browse Source 
PiperOrigin-RevId: 554667869
This commit is contained in:
MediaPipe Team 2023-08-07 19:41:47 -07:00 committed by Copybara-Service
parent c1c51c2fe7
commit 032ed973b6
1 changed files with 32 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

32
mediapipe/web/graph_runner/graph_runner.ts
View File

@ -66,6 +66,7 @@ export declare interface WasmModule {
(parent: string, name: string, canRead: boolean,
canWrite: boolean) => void;
FS_unlink(path: string): void;
gpuOriginForWebTexturesIsBottomLeft?: boolean;
errorListener?: ErrorListener;
_bindTextureToCanvas: () => boolean;
@ -349,6 +350,31 @@ export class GraphRunner {
this.wasmModule._setAutoRenderToScreen(enabled);
}
/**
* Overrides the vertical orientation for input GpuBuffers and the automatic
* render-to-screen code. The default for our OpenGL code on other platforms
* (Android, Linux) is to use a bottom-left origin. But the default for WebGL
* is to use a top-left origin. We use WebGL default normally, and many
* calculators and graphs have platform-specific code to handle the resulting
* orientation flip. However, in order to be able to use a single graph on all
* platforms without alterations, it may be useful to send images into a web
* graph using the OpenGL orientation. Users can call this function with
* `bottomLeftIsOrigin = true` in order to enforce an orientation for all
* GpuBuffer inputs which is consistent with OpenGL on other platforms.
* This call will also vertically flip the automatic render-to-screen code as
* well, so that webcam input (for example) will render properly when passed
* through the graph still.
* NOTE: This will immediately affect GpuBuffer inputs, but must be called
* *before* graph start in order to affect the automatic render-to-screen
* code!
* @param bottomLeftIsOrigin True will flip our input GpuBuffers and auto
* render-to-screen to match the classic OpenGL orientation, while false will
* disable this feature to match the default WebGL orientation.
*/
setGpuBufferVerticalFlip(bottomLeftIsOrigin: boolean): void {
this.wasmModule.gpuOriginForWebTexturesIsBottomLeft = bottomLeftIsOrigin;
}
/**
* Bind texture to our internal canvas, and upload image source to GPU.
* Returns tuple [width, height] of texture. Intended for internal usage.
@ -374,8 +400,14 @@ export class GraphRunner {
'Failed to obtain WebGL context from the provided canvas. ' +
'`getContext()` should only be invoked with `webgl` or `webgl2`.');
}
if (this.wasmModule.gpuOriginForWebTexturesIsBottomLeft) {
gl.pixelStorei(gl.UNPACK_FLIP_Y_WEBGL, true);
}
gl.texImage2D(
gl.TEXTURE_2D, 0, gl.RGBA, gl.RGBA, gl.UNSIGNED_BYTE, imageSource);
if (this.wasmModule.gpuOriginForWebTexturesIsBottomLeft) {
gl.pixelStorei(gl.UNPACK_FLIP_Y_WEBGL, false);
}
let width, height;
if ((imageSource as HTMLVideoElement).videoWidth) {