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Webgl Helper / Add a method to prepare drawing to render targets

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Olivier Guyot
2019-06-02 10:33:32 +02:00
parent 6224d749c4
commit 38920867fb
1 changed files with 24 additions and 0 deletions
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24
src/ol/webgl/Helper.js
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@@ -432,6 +432,30 @@ class WebGLHelper extends Disposable {
gl.enable(gl.BLEND);
gl.blendFunc(gl.ONE, gl.ONE_MINUS_SRC_ALPHA);
gl.useProgram(this.currentProgram_);
this.applyFrameState(frameState);
this.applyUniforms(frameState);
}
/**
* Clear the render target & bind it for future draw operations.
* This is similar to `prepareDraw`, only post processes will not be applied.
* Note: the whole viewport will be drawn to the render target, regardless of its size.
* @param {import("../PluggableMap.js").FrameState} frameState current frame state
* @param {import("./RenderTarget.js").default} renderTarget Render target to draw to
* @param {boolean} [opt_disableAlphaBlend] If true, no alpha blending will happen.
*/
prepareDrawToRenderTarget(frameState, renderTarget, opt_disableAlphaBlend) {
const gl = this.getGL();
gl.bindFramebuffer(gl.FRAMEBUFFER, renderTarget.getFramebuffer());
gl.bindTexture(gl.TEXTURE_2D, renderTarget.getTexture());
gl.clearColor(0.0, 0.0, 0.0, 0.0);
gl.clear(gl.COLOR_BUFFER_BIT);
gl.enable(gl.BLEND);
gl.blendFunc(gl.ONE, opt_disableAlphaBlend ? gl.ZERO : gl.ONE_MINUS_SRC_ALPHA);
gl.useProgram(this.currentProgram_);
this.applyFrameState(frameState);
this.applyUniforms(frameState);
}