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我正在尝试在 WebGL 2.0 中创建具有 32 位红色通道的整数纹理：

this.kdTreeTextureSize = Math.ceil(Math.sqrt(numberOfKdNodes));
this.kdTreeData = new Int32Array(this.kdTreeTextureSize * this.kdTreeTextureSize);
this.kdTree.fillDataArray(this.kdTreeData);
this.kdTreeTexture = gl.createTexture();
gl.activeTexture(gl.TEXTURE3);
gl.bindTexture(gl.TEXTURE_2D, this.kdTreeTexture);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.NEAREST);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.NEAREST);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.CLAMP_TO_EDGE);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.CLAMP_TO_EDGE);
gl.texImage2D(gl.TEXTURE_2D, 0, gl.R32I, this.kdTreeTextureSize, this.kdTreeTextureSize, 0, gl.RED_INTEGER, gl.INT, this.kdTreeData);

并在 GLES 3.0 片段着色器中阅读它：

int(texture(kdTreeTexture, getTexCoord(0, kdTreeTextureSize))

getTexCoord 函数：

vec2 getTexCoord(int i, float textureSize) {
    return vec2(
        (mod(float(i), float(textureSize)) + 0.5) / textureSize, 
        (float(i / int(textureSize)) + 0.5) / textureSize
    );
}

我将第一个像素的值设置为1073741824，即 2^30，但是在片段着色器中读取它时，我得到了错误的值1100730680 。这里有什么问题？提前致谢。

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1 回答 1

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Got it working. I forgot to do:

gl.uniform1i(gl.getUniformLocation(this.tracerProgram, "kdTreeTexture"), 3);
gl.uniform1i(gl.getUniformLocation(this.tracerProgram, "kdLeavesTexture"), 4);
于 2017-05-11T13:42:55.597 回答