WebGL写入Alpha

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1.drawScene中写入

 //设置Alpha        var blending = document.getElementById("blending").checked;        if (blending) {            gl.blendFunc(gl.SRC_ALPHA, gl.ONE);            gl.enable(gl.BLEND);            gl.disable(gl.DEPTH_TEST);            gl.uniform1f(shaderProgram.alphaUniform, parseFloat(document.getElementById("alpha").value));        } else {            gl.disable(gl.BLEND);            gl.enable(gl.DEPTH_TEST);        }

2.fragment中声明(透明度与vertex无关)

 //设置透明度(depth buffer)    uniform float uAlpha;    void main(void) {        //gl_FragColor = texture2D(uSampler, vec2(vTextureCoord.s, vTextureCoord.t));        vec4 textureColor = texture2D(uSampler, vec2(vTextureCoord.s, vTextureCoord.t));        gl_FragColor = vec4(textureColor.rgb * vLightWeighting, textureColor.a*uAlpha);    }

3.shaderProgram绑定shaderProgram

 shaderProgram.alphaUniform = gl.getUniformLocation(shaderProgram,"uAlpha");

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