GLSL 着色器和 WebGL 问题
我创建了一个在 Firefox 中完美运行的着色器，但在 Chrome 中，片段和顶点着色器无法链接。它们编译得很好，但在链接部分出了问题。我已将问题定位在以下代码中：
else if (uLightType[i] == 1) { //point light
NdotL = dot(n, normalize(lightDir[i]));
if (NdotL > 0.0) {
distance = length(lightDir[i]);
att = (1.0 / (uLightAttenuation[i] * distance * distance));
color += vec3(uLightColor[i] * NdotL * uLightIntensity[i] * att);
}
}
这段小代码计算从点光源反射的漫反射颜色。它是一个更大的 for 循环的一部分。正如这里所示，它根本不会链接，但如果我从计算 att 中删除 uLightAttenuation，就像这样：
att = (1.0 / (distance * distance));
它工作得很好。如果我用任何其他制服（例如 uLightIntensity）替换它，
att = (1.0 / (uLightIntensity[i] * distance * distance));
它又将不起作用。如果我用一个简单的常量值/浮点变量替换它，奇怪的是它会编译。更奇怪的是，如果我从计算颜色中删除 att，但将制服保持在当前位置，它运行得很好：
att = (1.0 / (uLightAttenuation[i] * distance * distance));
color += vec3(uLightColor[i] * NdotL * uLightIntensity[i]);
制服是一个浮点值，即使这是类型转换的问题，它也会失败在编译时，而不是链接时。
这是完整的着色器，也许我错过了代码中其他地方的东西。
I have created a shader that works perfectly in Firefox, but in Chrome the fragment and vertex shader cannot be linked. They compile just fine, but at the linking part something goes wrong. I have localized the problem at the fallowing bit of code :
else if (uLightType[i] == 1) { //point light
NdotL = dot(n, normalize(lightDir[i]));
if (NdotL > 0.0) {
distance = length(lightDir[i]);
att = (1.0 / (uLightAttenuation[i] * distance * distance));
color += vec3(uLightColor[i] * NdotL * uLightIntensity[i] * att);
}
}
This small piece of code calculates the diffuse color reflected from a point light. It's part of a larger for loop. As it is shown here it won't link at all, but if I remove uLightAttenuation from calculating att, like so :
att = (1.0 / (distance * distance));
it works just fine. If I replace it with any other uniform, say uLightIntensity,
att = (1.0 / (uLightIntensity[i] * distance * distance));
again it won't work. If I replace it with a simple constant value / float variabile, strangely enough it compiles. And what is even more strange is, if I remove att from calculating color, but keep the uniform at it's current position, it runs just fine:
att = (1.0 / (uLightAttenuation[i] * distance * distance));
color += vec3(uLightColor[i] * NdotL * uLightIntensity[i]);
The uniform is a float value, and even if it were a problem with type casting it should fail at compilation, not linking.
Here are the complete shaders, maybe I missed something elsewhere in the code.
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我已经成功地让它工作了，结果发现我有两个问题。一种是计算att时除以0。它可以让我在浮动制服上划分一些东西，所以我将 uLightAttenuation 和 uLightIntensity 组合成一个 vec2 制服，之后该部分起作用了。其次，在计算颜色时，我必须单独引用每个组件（颜色[0]、颜色[1]等...）并且仅使用浮点变量而不是向量。之后它在 chrome 中就可以正常工作了。
I have managed to make it to work, it turns out I had 2 problems. One is with division by 0 when calculating att. It would let me divide something over a float uniform, so I combined uLightAttenuation and uLightIntensity into a single vec2 uniform, after that that part worked. Secondly, when calculating color I had to reference every component individually (color[0], color[1] etc...) and work only with float variables and not vectors. After that it worked correctly in chrome to.