小编mik*_*_os的帖子

我是很新的OpenGL的.

我正在尝试绘制纹理四边形(2个三角形).纹理的大小是900x900px.我对一个四边形没有任何问题但是当我试图绘制5-10个四边形时,我看到明显的减速.

也许我做错了什么......

码:

public void onDrawFrame(GL10 gl) {
    GLES20.glClear(GLES20.GL_COLOR_BUFFER_BIT | GLES20.GL_DEPTH_BUFFER_BIT);
    ... matrix calculation ...
    GLES20.glUniformMatrix4fv(mMVPMatrixHandle, 1, false, mvpMatrix, 0);
    GLES20.glDrawArrays(GLES20.GL_TRIANGLE_STRIP, 0, 4);
}

顶点着色器:

uniform mat4 uMVPMatrix;
attribute vec4 vPosition;
attribute vec2 a_TexCoordinate;
varying vec2 v_TexCoordinate;
void main() {
  gl_Position = uMVPMatrix*vPosition;
  v_TexCoordinate = a_TexCoordinate;
}

片段着色器:

    precision mediump float;
    uniform sampler2D u_PreviewTexture;
    varying vec2 v_TexCoordinate;

    void main() {
      vec4 color = texture2D(u_PreviewTexture, v_TexCoordinate);
      gl_FragColor = color;
    }

测试平台是Galaxy S3.在分析器中,我看到大约60ms需要eglSwapBuffers调用.

如何快速绘制具有大纹理的四边形？