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所以我有這個WebGL的頂點着色器:WebGL的VBO和整數溢出根據變量的存在屬性,統一或混合
precision mediump float;
uniform mat4 camera;
uniform vec3 pos0;
uniform float time;
attribute float t0;
attribute vec3 dir0;
void main() {
float t = time - t0;
gl_Position = camera * vec4(dir0, 1);
gl_PointSize = 10.0;
}
,工作正常,但如果我只更改以下行
gl_Position = camera * vec4(pos0 + dir0 * t, 1);
火狐抱怨:
Error: WebGL: drawElements: no VBO bound to enabled vertex attrib index 0!
如果我更改了同一行以下:
gl_Position = camera * vec4(pos0, 1);
的錯誤是不同的:
Error: WebGL: Drawing without vertex attrib 0 array enabled forces the browser to do expensive emulation work when running on desktop OpenGL platforms, for example on Mac. It is preferable to always draw with vertex attrib 0 array enabled, by using bindAttribLocation to bind some always-used attribute to location 0.
Error: WebGL: Integer overflow trying to construct a fake vertex attrib 0 array for a draw-operation with -1 vertices. Try reducing the number of vertices.
這是怎麼回事?
編輯:鉻給出更明確的錯誤消息:
glDrawElements: attempt to access out of range vertices in attribute 1
你如何設置你的制服和屬性?你能發佈你的代碼嗎? – agmcleod