(
elements,
data,
usage,
prim,
count,
byteLength,
type)
| 68 | } |
| 69 | |
| 70 | function initElements ( |
| 71 | elements, |
| 72 | data, |
| 73 | usage, |
| 74 | prim, |
| 75 | count, |
| 76 | byteLength, |
| 77 | type) { |
| 78 | elements.buffer.bind() |
| 79 | var dtype |
| 80 | if (data) { |
| 81 | var predictedType = type |
| 82 | if (!type && ( |
| 83 | !isTypedArray(data) || |
| 84 | (isNDArrayLike(data) && !isTypedArray(data.data)))) { |
| 85 | predictedType = extensions.oes_element_index_uint |
| 86 | ? GL_UNSIGNED_INT |
| 87 | : GL_UNSIGNED_SHORT |
| 88 | } |
| 89 | bufferState._initBuffer( |
| 90 | elements.buffer, |
| 91 | data, |
| 92 | usage, |
| 93 | predictedType, |
| 94 | 3) |
| 95 | } else { |
| 96 | gl.bufferData(GL_ELEMENT_ARRAY_BUFFER, byteLength, usage) |
| 97 | elements.buffer.dtype = dtype || GL_UNSIGNED_BYTE |
| 98 | elements.buffer.usage = usage |
| 99 | elements.buffer.dimension = 3 |
| 100 | elements.buffer.byteLength = byteLength |
| 101 | } |
| 102 | |
| 103 | dtype = type |
| 104 | if (!type) { |
| 105 | switch (elements.buffer.dtype) { |
| 106 | case GL_UNSIGNED_BYTE: |
| 107 | case GL_BYTE: |
| 108 | dtype = GL_UNSIGNED_BYTE |
| 109 | break |
| 110 | |
| 111 | case GL_UNSIGNED_SHORT: |
| 112 | case GL_SHORT: |
| 113 | dtype = GL_UNSIGNED_SHORT |
| 114 | break |
| 115 | |
| 116 | case GL_UNSIGNED_INT: |
| 117 | case GL_INT: |
| 118 | dtype = GL_UNSIGNED_INT |
| 119 | break |
| 120 | |
| 121 | default: |
| 122 | check.raise('unsupported type for element array') |
| 123 | } |
| 124 | elements.buffer.dtype = dtype |
| 125 | } |
| 126 | elements.type = dtype |
| 127 |
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