WebGL2RenderingContext.vertexAttribIPointer()

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句法
描述
范例
规范
浏览器兼容性
另请参阅
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检查浏览器兼容性表格要小心谨慎在生产中使用这之前。

WebGL2RenderingContext.vertexAttribIPointer() 方法在 WebGL 2 API specifies integer data formats and locations of vertex attributes in a vertex attributes array.

句法

void gl.vertexAttribIPointer(index, size, type, stride, offset);

参数

index: GLuint specifying the index of the vertex attribute that is to be modified.
size: GLint specifying the number of components per vertex attribute. Must be 1, 2, 3, or 4.
type: A GLenum specifying the data type of each component in the array. Must be one of: gl.BYTE , gl.UNSIGNED_BYTE , gl.SHORT , gl.UNSIGNED_SHORT , gl.INT ，或 gl.UNSIGNED_INT .
stride: GLsizei specifying the offset in bytes between the beginning of consecutive vertex attributes.
offset: GLintptr specifying an offset in bytes of the first component in the vertex attribute array. Must be a multiple of type .

返回值

None.

描述

Very similar to WebGLRenderingContext.vertexAttribPointer() . The main difference is that while values specified by vertexAttribPointer are always interpreted as floating-point values in the shader (even if they were originally specified as integers in the buffer), this method allows specifying values which are interpreted as integers in the shader.

范例

Linear Blend Skinning

//Describe the layout of the buffer:
//1. position
gl.vertexAttribPointer(0, 3, gl.FLOAT, false, 20, 0);
gl.enableVertexAttribArray(0);
//2. bone weights, normalized to [0, 1]
gl.vertexAttribPointer(1, 4, gl.UNSIGNED_BYTE, true, 20, 12);
gl.enableVertexAttribArray(1);
//3. bone indices, interpreted as integer
gl.vertexAttribIPointer(2, 4, gl.UNSIGNED_BYTE, 20, 16);
gl.enableVertexAttribArray(2);
//Connect to attributes from the vertex shader
gl.bindAttribLocation(shaderProgram, 0, "position");
gl.bindAttribLocation(shaderProgram, 1, "boneWeights");
gl.bindAttribLocation(shaderProgram, 2, "boneIndices");

<script id="shader-vs" type="x-shader/x-vertex">#version 300 es
uniform mat4 mvMatrix;
uniform mat4 bones[120];
in vec3 position;
in vec4 boneWeights;
in uvec4 boneIndices;//read as 4-component unsigned integer
void main() {
    vec4 skinnedPosition =
        bones[boneIndices.s] * vec4(position, 1.0) * boneWeights.s +
        bones[boneIndices.t] * vec4(position, 1.0) * boneWeights.t +
        bones[boneIndices.p] * vec4(position, 1.0) * boneWeights.p +
        bones[boneIndices.q] * vec4(position, 1.0) * boneWeights.q;
    gl_Position = mvMatrix * skinnedPosition;
}
</script>

规范

规范	状态	注释
WebGL 2.0 The definition of 'vertexAttribIPointer' in that specification.	编者草案	Initial definition for WebGL.
OpenGL ES 3.0 The definition of 'glVertexAttribPointer' in that specification.	标准	Man page of the (similar) OpenGL API.

浏览器兼容性

更新 GitHub 上的兼容性数据

	桌面						移动
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet
`vertexAttribIPointer`	Chrome 56	Edge 79	Firefox 51	IE No	Opera 43	Safari No	WebView Android 58	Chrome Android 58	Firefox Android 51	Opera Android 43	Safari iOS No	Samsung Internet Android 7.0

图例

完整支持
不支持

另请参阅

WebGLRenderingContext.vertexAttribPointer()

元数据

最后修改： 2019 年 3 月 23 日

在此页

句法

参数

返回值

描述

范例

Linear Blend Skinning

规范

浏览器兼容性

图例

另请参阅

相关话题