GLES 2.0的最大可变向量和浮点数 [英] Max Varying Vectors and Floats for GLES 2.0

问题描述

我正在尝试找出在与OpenGL ES 2.0兼容的设备上可以使用的可变矢量和统一形式的最大数量.我试图了解MAX_VARYING_VECTORS的工作方式.因此，如果MAX_VARYING_VECTORS为8，是否意味着我可以存储8 * 4字节的数据用于变化，还是意味着我只能定义8个变化，而与数据类型无关?

I am trying to figure out what is the maximum number of varying vectors and uniforms I can use on a device that is OpenGL ES 2.0 compatible. I am trying to understand how MAX_VARYING_VECTORS works. So if MAX_VARYING_VECTORS is 8, does that mean I can store 8 * 4 bytes of data for varyings or does it mean that I can only define 8 varyings irrespective of the data type?

推荐答案

MAX_VARYING_VECTORS以4成员浮点矢量(vec4)为单位进行度量.因此，最小保证值为8，您可以有8种类型的vec4.

MAX_VARYING_VECTORS is measured in units of 4-member float vectors (vec4). So with the minimum guaranteed value of 8, you can have 8 varyings of type vec4.

关于其他类型到底如何适合此可用空间的规则相当复杂.对于MAX_VARYING_VECTORS为8的示例，整个对象被视为8行4列的2D数组.该数组中的空间以一定顺序分配给变化，该变化主要是从最大到最小，并且规则取决于变量的大小以及数组中仍然可用的空白空间的大小/位置.

The rules on how exactly other types fit into this available space are fairly complex. For the example where MAX_VARYING_VECTORS is 8, the whole thing is treated as a 2D array of 8 rows and 4 columns. Space in this array is allocated to varyings in a certain order (which mostly goes from largest to smallest), and rules that depend on the size of the variable and the size/location of empty space still available in the array.

确切的规则在GLSL ES 1.00规范文档中约占2.5页.它们在第111-113页上.复制整个内容没有多大意义，而且恐怕无法在保持准确性的情况下将其转换为简单得多的内容.

The exact rules fill about 2.5 pages in the GLSL ES 1.00 spec document. They are on pages 111-113. Copying the whole thing would not make a lot of sense, and I'm afraid that I can't turn it into something much simpler while still remaining accurate.

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