CocosPlugin/esengine
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

新增webgl帮助类 用于自定义绘图

Browse Source
This commit is contained in:
yhh
2020-06-10 13:38:04 +08:00
parent 5f7c13c8cd
commit 94818d5784
8 changed files with 135 additions and 3 deletions
Download Patch File Download Diff File Expand all files Collapse all files

38
demo/libs/framework/framework.js
View File

@@ -2677,3 +2677,41 @@ var Vector2Ext = (function () {
};
return Vector2Ext;
}());
var WebGLUtils = (function () {
function WebGLUtils() {
}
WebGLUtils.getWebGL = function () {
return document.querySelector("canvas").getContext("webgl");
};
WebGLUtils.drawUserIndexPrimitives = function (primitiveType, vertexData, vertexOffset, numVertices, indexData, indexOffset, primitiveCount) {
var GL = this.getWebGL();
GL.bindBuffer(GL.ARRAY_BUFFER, 0);
this.checkGLError();
GL.bindBuffer(GL.ELEMENT_ARRAY_BUFFER, 0);
this.checkGLError();
GL.drawElements(primitiveType, this.getElementCountArray(primitiveType, primitiveCount), GL.UNSIGNED_SHORT, indexOffset * 2);
this.checkGLError();
};
WebGLUtils.getElementCountArray = function (primitiveType, primitiveCount) {
var GL = this.getWebGL();
switch (primitiveType) {
case GL.LINES:
return primitiveCount * 2;
case GL.LINE_STRIP:
return primitiveCount + 1;
case GL.TRIANGLES:
return primitiveCount * 3;
case GL.TRIANGLE_STRIP:
return primitiveCount + 2;
}
throw new Error("not support");
};
WebGLUtils.checkGLError = function () {
var GL = this.getWebGL();
var error = GL.getError();
if (error != GL.NO_ERROR) {
throw new Error("GL.GetError() returned" + error);
}
};
return WebGLUtils;
}());